A subway station shield path simulation simulation turning construction method

Abstract

The application relates to the technical field of shield construction, and provides a metro station shield path simulation and simulation turning construction method, which comprises the following steps: establishing a three-dimensional model of a metro station, simulating generation of a shield machine turning path and a rear supporting trolley path; importing the three-dimensional model into test software, adding the simulated motion path, and performing three-dimensional collision checking; exporting constraint force position data; installing a support based on the simulated shield machine turning path and the exported constraint force position data; pushing the bracket and the shield machine thereon by using a jack, so that the shield machine moves to a target position according to the simulated shield machine turning path; the trolleys of the rear supporting trolleys are fixed on the turning platform one by one, and the turning platform with the fixed trolleys is moved to a starting side platform area by using a battery car. The application combines path simulation and simulation with on-site construction optimization, effectively controls the turning construction path, greatly improves the construction efficiency, and reduces the construction safety risk.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of shield construction, and particularly relates to a simulation and simulation turning construction method for a shield path of a subway station. BACKGROUND

[0002] With the increasing urban traffic pressure, more and more subway stations adopt a full-closed roof structure form so as to restore the road as soon as possible to relieve the ground traffic pressure. After a shield machine is out of a hole on a line in a closed subway station, the shield machine and a supporting trolley cannot be hoisted out and need to be transferred to another line through translation and turning for secondary launching.

[0003] In the analysis of the turning construction of the shield machine, the technical difficulties mainly lie in the following two aspects. One is that the turning area of the shield machine is a closed space, the construction operation site is small, the space is limited, and the early preparation work of the shield machine turning is difficult. The other is that the trajectory is difficult to control when the shield machine and the supporting trolley turn, the traditional single mode of pushing the shield machine and the bracket through the external jack for translation and turning is slow, and the direction cannot be accurately controlled, which is easy to cause the collision between the shield machine or the trolley and the side wall, and affects the construction progress and safety. Therefore, how to quickly, efficiently and accurately realize the shield turning in the closed station is a difficult problem to be solved in the field of shield construction. SUMMARY

[0004] In view of the problems in the prior art, the application provides a simulation and simulation turning construction method for a shield path of a subway station, which combines path simulation and optimization of field construction, effectively controls the turning construction path, greatly improves the construction efficiency, and reduces the construction safety risk.

[0005] The simulation and simulation turning construction method for a shield path of a subway station provided by the application comprises the following steps.

[0006] Step 1: Path simulation

[0007] A three-dimensional model of the subway station is established by using a physical simulation software, a plurality of constraint forces are set on the shield machine and the supporting trolley, and the shield machine turning path and the supporting trolley path are simulated and generated. Then, the three-dimensional model is imported into a test software, the above-mentioned simulated motion path is added, three-dimensional collision checking is performed, and the constraint force position data is exported.

[0008] Step 2: Construction preparation

[0009] The required materials are first transferred to the turning area, the bottom plate of the turning area is leveled, the turning area is fully paved with steel plates, the support pieces, top iron and limiting blocks required for turning are made, and the position is preset and laid out.

[0010] Step 3: Shield machine turning

[0011] installing a support based on the generated shield machine turning path and the derived constraint force position data; installing a jack between the support and the bracket; pushing the bracket and the shield machine thereon by using the jack to move the shield machine to a target position according to the generated shield machine turning path;

[0012] Step four, turning of the rear supporting trolley:

[0013] manufacturing a turning platform and moving it to an initial position, which is a side of the turning area close to the receiving side platform area; using an electric vehicle of the rear supporting trolley to pull a trolley of the rear supporting trolley onto the turning platform and fixing it; installing a support based on the generated rear supporting trolley path and the derived constraint force position data; installing a jack between the support and the turning platform; turning and translating the turning platform to a side of the turning area close to the originating side platform area by using the jack; unloading the electric vehicle and the trolley on the turning platform to the originating side platform area, and moving the turning platform to the initial position by using the electric vehicle; fixing the trolleys of the rear supporting trolley one by one on the turning platform, and moving the turning platform with the fixed trolleys to the originating side platform area by using the electric vehicle of the originating side platform area, until all the trolleys of the rear supporting trolley at the receiving side platform area are moved to the originating side platform area.

[0014] Further, the step of establishing a three-dimensional model of the subway station by using the physical simulation software includes:

[0015] The physical simulation software INTERACTIVE PHYSICS is used to establish models of the side wall, platform, shield machine, rear supporting trolley, turning platform, pulley block and electric vehicle of the subway station, wherein a plurality of constraint forces and monitoring points are arranged on the shield machine and the rear supporting trolley; the pulley block includes a fixed pulley and a movable pulley, and a rope constraint is arranged between the pulley blocks;

[0016] Further, the step of simulating the shield machine turning path includes:

[0017] When the shield machine is in the straight line stage, the defined two constraint forces are moved to the symmetric positions of the rear end of the shield machine, and the software is started to generate a movement path and time;

[0018] When the shield machine is in the turning stage, the position of one of the constraint forces is kept unchanged, and the pushing position of the other constraint force is changed equidistantly, a plurality of turning movement paths are generated, the movement path with the largest distance from the side wall is selected, and the constraint force position is derived.

[0019] Further, the step of generating the post-positioned trolley path by simulation comprises:

[0020] The post-positioned trolley, the turning platform, the pulley set and the electric trolley are fixed by a constraint force, the post-positioned trolley coordinates are preliminarily set, the constraint force is added to the electric trolley, the post-positioned trolley is set on the turning platform, the turning platform is pulled by the pulley set connected with the electric trolley, the simulation is started, the post-positioned trolley coordinates or the pulley set coordinates are changed equidistantly, a plurality of turning motion paths of the post-positioned trolley are generated, the motion path with the largest distance from the side wall is selected, and the constraint force position is derived.

[0021] Further, the step of performing three-dimensional collision checking comprises: optimizing the motion path according to the three-dimensional collision checking result until all parts of the shield tunneling machine and the post-positioned trolley do not collide with the side wall and the platform, finally generating the coordinate and constraint force position data of each stage, and exporting.

[0022] Further, the step of presetting the position layout comprises: exporting the path parameters after the simulation and collision checking, obtaining the coordinates of the shield tunneling machine and the post-positioned trolley at each stage, measuring the layout points by the total station instrument, and marking on the steel plate.

[0023] Further, the step of pushing the bracket and the shield tunneling machine thereon by the jack comprises:

[0024] The bracket and the shield tunneling machine thereon are translated to a preset turning position 1 by the jack arranged at the rear end of the bracket;

[0025] The bracket and the shield tunneling machine thereon are rotated 90° in the clockwise direction by the jack arranged at the rear end and the outer side of the bracket;

[0026] The bracket and the shield tunneling machine thereon are translated to a preset turning position 2 by the jack arranged at the rear end of the bracket;

[0027] The bracket and the shield tunneling machine thereon are rotated 90° in the clockwise direction again by the jack arranged at the rear end and the outer side of the bracket;

[0028] The bracket and the shield tunneling machine thereon are translated to the target position by the jack arranged at the rear end of the bracket, and the rotation turning of the shield tunneling machine is completed.

[0029] Further, the step of pushing the bracket and the shield tunneling machine thereon by the jack arranged at the rear end of the bracket comprises:

[0030] A jack is installed between the bracket and the support, and the jack is fixed with the bracket; the jack retracts after each pushing stroke, and the jack supports the jacks between the jack and the support, and the process is repeated until the translation of the shield machine is completed.

[0031] Further, the step of moving the turning platform with the trolley towed by the battery car in the originating side platform area comprises:

[0032] Based on the simulated rear matching trolley path and derived constraint force position data, a support, a limit block, a steel wire rope, a fixed pulley and a movable pulley are installed; the support, the limit block and the fixed pulley are installed on the side of the turning area close to the originating side platform area; the movable pulley is installed on the turning platform; one end of the steel wire rope is connected with the battery car, and the other end is connected with the support after passing through the fixed pulley and the movable pulley;

[0033] Based on the constraint force position data, the position of the movable pulley on the turning platform is adjusted, the turning platform is moved by the battery car and rotated by 180 degrees in the clockwise direction until the turning platform is located in the originating side platform area.

[0034] Further, the turning platform comprises a bottom plate, a plurality of door-shaped supports arranged on the bottom plate, and a plurality of steel rails arranged on the door-shaped supports; a plurality of jack clamping grooves for installing the jacks are arranged on the bottom plate.

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

[0036] According to the resistance difference and path simulation analysis, the present application realizes the turning of the shield machine and the rear matching trolley by using multiple ways, improves the turning efficiency, and realizes the turning of the rear matching trolley by using the pulley block and the specially designed turning platform, so that the turning speed is faster;

[0037] The present application uses physical simulation and simulation technology to determine the key positions of each stage in advance, and adjusts the jack pushing or pulley block traction during construction to control the shield machine and the rear matching trolley to reach the key positions in turn, so that the turning path control is more accurate, the trajectory is easy to find, and the turning process is easier to control;

[0038] The present application is based on the comprehensive technology of path simulation + field construction optimization, and has been tested in multiple projects, which can effectively control the turning construction path, greatly improve the construction efficiency, and reduce the construction safety risk;

[0039] The application utilizes the electric battery car as power, and through the pulley set system to pull the trolley to turn around, which greatly shortens the engineering time, meanwhile, the jacks, turning platforms, top irons, supporting pieces, limiting blocks and other components and steel materials used in the method can be recycled, in the jacking process, all components are recycled with the position change of the shield machine and trolley, and there is no material loss, which has good economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is the process flow diagram of the construction method of the application;

[0041] Figure 2 It is the structure diagram of the prefabricated component of the application;

[0042] Figure 3 It is the structure diagram of the shield machine jacking and turning of the application;

[0043] Figure 4 It is the traction structure diagram of the rear matched trolley of the application

[0044] Figure 5 It is the translation diagram of the shield machine and bracket of the application;

[0045] Figure 6 It is the installation diagram of the top iron of the application;

[0046] Figure 7 It is the turning diagram of the shield machine and bracket of the application;

[0047] Figure 8 It is the translation diagram of the shield machine and bracket of the application;

[0048] Figure 9 It is the second turning diagram of the shield machine and bracket of the application;

[0049] Figure 10 It is the translation diagram of the shield machine and bracket to the original position of the application;

[0050] Figure 11 It is the whole diagram of the turning platform of the application;

[0051] Figure 12 It is the turning and turning platform resetting diagram of the 1# electric battery car and 6# trolley of the application;

[0052] Figure 13 It is the turning diagram of the turning platform and 5# trolley of the application;

[0053] Figure 14 It is the translation diagram of the turning platform and 5# trolley of the application;

[0054] Figure 15 It is the second turning diagram of the turning platform and 5# trolley of the application.

[0055] In the diagram: 11-Supporting component; 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 and fixing device; 53-Turning platform; 54-Moving pulley; 55-Fixed pulley; 56-Wire rope; 531-Gantry bracket; 532-Channel steel component; 533-Base plate; 534-Rail; 535-Jack slot; 536-Reserved round hole; 61-Side wall; 62-Starting side platform area; 63-Receiving side platform area; 64-Turning area. Detailed Implementation

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] like Figure 1 The simulated tunnel boring machine (TBM) path turning method shown is mainly used to solve the problems of difficult pre-turn preparation work for existing TBMs and the difficulty in controlling the trajectory during TBM and subsequent auxiliary trolley turns. The method in this case includes the following steps:

[0058] Step 1: Path Simulation

[0059] A 3D model of the subway station was built using physical simulation software. Multiple constraints were set on the tunnel boring machine 30 and the rear supporting trolley, and the turning path of the tunnel boring machine 30 and the path of the rear supporting trolley were simulated and generated. Then, the 3D model was imported into the testing software, the motion path generated by the above simulation was added, and a 3D collision check was performed. The constraint position data was then exported.

[0060] Step Two: Construction Preparation

[0061] First, transfer the required materials to the turning area 64; level the bottom plate of the turning area 64; fully lay steel plates in the turning area 64; fabricate the prefabricated components required for turning, including support 11, top iron 12 and limiting block 13; lay out the preset positions;

[0062] Step 3: The tunnel boring machine turns around 30 degrees.

[0063] The tunnel boring machine (TBM) 30 is mounted on the bracket 21, separating the TBM 30 from the rear-mounted trolley. Based on the simulated turning path of the TBM 30 and the derived constraint force position data, the support component 11 is installed. A jack 40 is installed between the support component 11 and the bracket 21. The jack 40 is used to push the bracket 21 and the TBM 30 on it, so that the TBM 30 moves to the target position according to the simulated turning path. The target position of the TBM 30 is the starting position after the TBM 30 completes its turn.

[0064] Step four, the rear matching trolley turns around:

[0065] The turning platform 53 is made and moved to the initial position, which is the side of the turning area 64 close to the receiving side platform area 63; one electric vehicle of the rear matching trolley pulls one trolley of the rear matching trolley to the turning platform 53 and fixes it; based on the rear matching trolley path generated by simulation and the derived constraint force position data, the support 11 is installed; the jack 40 is installed between the support 11 and the turning platform 53; the turning platform 53 is turned and translated to the side of the turning area 64 close to the originating side platform area 62 by using the jack 40; the electric vehicle and the trolley 51 on the turning platform 53 are unloaded to the originating side platform area 62, and the turning platform 53 is moved to the initial position by using the electric vehicle; the trolleys of the rear matching trolley are fixed on the turning platform 53 one by one, and the turning platform 53 with the fixed trolleys is moved to the originating side platform area 62 by using the electric vehicle of the originating side platform area 62, until all the trolleys 51 of the rear matching trolley in the receiving side platform area 63 are moved to the originating side platform area 62.

[0066] As shown in Figures 1-15 , the method of the application specifically includes:

[0067] Step one: the specific execution process of path simulation is as follows:

[0068] The physical simulation software INTERACTIVE PHYSICS is used to establish the side wall 61, the platform, the shield machine 30, the rear matching trolley, the turning platform 53, the pulley block, the electric vehicle and the like. The constraint force and the monitoring point are set on the main machine of the shield machine 30 and the rear matching trolley, and the rope constraint is set between the pulleys.

[0069] When the shield machine 30 is located in the straight section, the defined constraint force is moved to the symmetric position of the tail of the shield machine 30, the software is started to generate the turning path and the 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, a plurality of turning motion paths are generated, the motion path with the largest distance from the side wall 61 is selected, and the position information is derived;

[0070] The rear matching trolley, the turning platform 53, the pulley block and the electric vehicle are fixed by constraint, the rear matching trolley coordinates are initially set, the defined constraint force is added to the electric vehicle, the simulation is started, the rear matching trolley coordinates or the fixed pulley 55 coordinates are changed equidistantly (that is, one variable is kept), a plurality of trolley turning motion paths are generated, the motion path with the largest distance from the side wall 61 (the platform) is selected, and the position information is derived;

[0071] The three-dimensional model is imported into NAVISWORKS, the movement path generated by simulation is added, three-dimensional collision checking is performed, and the turning path is optimized according to the result until the shield machine 30 and all parts on the trolley do not collide with the side wall 61, the platform and the upturned beam. Finally, the coordinate data of each stage of turning and the position data of the constraint force are generated.

[0072] Step two: the specific implementation process of construction preparation is as follows:

[0073] Through the reserved hole of the standard section of the station structure, the materials such as forklift, winch, track, steel plate, profile, cement and the like are hoisted into the well, the forklift is moved to the turning area 64 and fixed by using the winch, the temporary track is laid along the line direction, the simple transfer trolley is made by using the steel pipe and the steel plate on the track, the steel plate is holed at the front end, the steel wire rope 56 is fixed, the other end is connected with the winch, and all other materials are placed on the steel plate and transferred to the turning area 64 along with the steel plate;

[0074] The elevation collection is performed on the turning area 64, the sand mortar is uniformly laid at the position where the local height difference exceeds 1cm, the sand mortar is mixed by using the bagged cement and fine sand on site, the measurement is rechecked after the sand mortar is solidified, and the sand mortar laying flatness is ensured;

[0075] Every 1m at the boundary of the turning area 64 is drilled into a 25mm round hole by using the electric drill, the Φ22 steel bar is implanted after the hole is cleaned, the chain block is fixed on the steel bar, the steel plate is placed along the area boundary in sequence by manual cooperation, the joint between the steel plates is firmly welded, the length of the weld is 30cm, the interval is 1m, and the surface is polished;

[0076] The prefabricated components required for turning are made, wherein the prefabricated components at least include the support 11, the top iron 12 and the limiting block 13. The top iron 12 includes the I-beam 121, the rib plate 122 connected to the web plate of the I-beam 121 and the connecting block connected to one end of the I-beam 121. The connecting block includes two connecting plates 123 clamped at two ends of the I-beam 121, and the connecting plates 123 are provided with grooves for placing the channel steel pressing beam 14. The connecting plates 123 are provided with bolt holes, and the two ends of the I-beam 121 are also provided with bolt holes. One connecting block is connected to one end of the I-beam 121 by high-strength bolts. When the adjacent top irons 12 are butted, the two connecting plates 123 of the connecting block of one top iron 12 are clamped at one end of the other top iron 12, and the two are connected by high-strength bolts.

[0077] The path parameters after simulation and collision checking are exported to obtain the coordinates of the shield machine 30 and the trolley at each stage, the points are measured by using the total station instrument, and the marks are made on the steel plate.

[0078] Step three: turning of the shield machine 30:

[0079] According to the height difference of the bottom plate of the receiving side after leveling and the starting posture of the shield machine 30, the height of the bracket 21 is determined (for example, 10 cm), the bottom layer of the bracket 21 is laid flat at the receiving position, butter is applied to the lower part, the joints between the steel plates are firmly welded, and the joints are polished flat. After the assembly is completed, the bevels along the four sides of the steel plate are polished, and the bracket 21 is raised by using steel plate pads to stack and weld layer by layer. The steel plate pads are laid flat on the bottom layer of the bracket 21, the lower pads are 2 cm longer than the upper pads on one side, the top pads should at least extend 2 cm beyond the bracket 21 guide rail pressure plate and support beam, the pads are arranged longitudinally at the lower end of the bracket 21 guide rail pressure plate, and transversely at the lower end of the support beam. The distance between the pads is set to 20 cm, and after the laying is completed, the bracket 21 bottom layer steel plate and the pads are firmly connected by using triangular welding.

[0080] The position of the shield machine 30 is determined by measuring and lofting, and the bracket 21 is adjusted to coincide with the position. Triangular steel plates are welded on both sides of the bracket 21, and holes are drilled around the triangular steel plates to plant steel bars, which are firmly welded with the triangular plates. Steel bars are planted in the holes drilled at the full-plate position at the front end of the bracket 21, and the steel bars are plug-welded with the steel plate. The steel bars protruding from the steel plate are cut and polished to ensure that the top surface of the steel plate is smooth and flat.

[0081] After the cutter head of the shield machine 30 breaks through the end wall, it is pushed empty onto the bracket 21, and channel steel is used to weld the shield machine 30 and the bracket 21 to form a whole.

[0082] A section of a plate car is reserved under the connecting bridge, and a support is made of a profile steel on the plate car to maintain the relative position of the front end of the connecting bridge and the shield machine 30 unchanged, and finally the travel control pins between the connecting bridge and the shield machine 30 are removed.

[0083] As shown in Figure 5 , support members 11 are welded at positions a and b determined by measuring and lofting, two 100t jacks 40 are placed between the support members 11 and the bracket 21, and then the jacks 40 are started to push the bracket 21. When the jacks 40 reach the maximum stroke, the oil cylinder is retracted, a top iron 12 is placed between the jacks 40 and the support members 11 (the top iron 12 is installed by high-strength bolts, and a channel steel pressure beam 14 is placed in the grooves on the upper parts of the two parallel top irons 12), and then the pushing is continued. Repeat the above steps until the whole formed by 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, i.e. the end of the shield machine 30 facing the jacks 40, is the rear end of the shield machine 30, and the front end is the end provided with the cutter head. 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] As shown in Figure 7At positions c, d, e, and f determined by surveying and layout, reaction frames are welded. Jack 40 is transferred to the front end of support member 11 at positions c and d. Jack 40 is then activated to push the support frame 21, generating a rotational torque that causes the tunnel boring machine 30 and support frame 21 to move along a predetermined trajectory, completing a 45° inward turn. Jack 40 at positions c and d is then transferred to positions e and f, and jack 40 is activated again, causing the tunnel boring machine 30 and support frame 21 to rotate inward again by 45°, completing a 90° turn. (The remaining text appears to be incomplete and possibly contains errors.) Figure 5 , Figure 7 As shown, after the tunnel boring machine 30 moves to the preset turning position 1, position c is located at the rear end of the tunnel boring machine 30 and close to the outside of the tunnel boring machine 30; position d is located on the outside of the tunnel boring machine 30 and close to the front end of the tunnel boring machine 30. After the tunnel boring machine 30 rotates inward by 45°, mark the two force points of the bracket 21 and the jacks 40 at positions c and d, remove the jacks 40 at positions c and d, and transfer them to positions e and f. The force point of contact between the bracket 21 and the jack 40 at position c corresponds to the jack 40 at position e, and the force point of contact between the bracket 21 and 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 tunnel boring machine 30 and close to the outside of the tunnel boring machine 30, and position f is located on the outside of the tunnel boring machine 30 and close to the front end of the tunnel boring machine 30. Simultaneously, the jacks 40 at positions e and f are activated, causing the tunnel boring machine 30 and the support frame 21 to rotate inward by 45° again, ultimately completing a 90° clockwise turn of the tunnel boring machine 30 and the support frame 21.

[0085] like Figure 8 At positions d and g determined by measurement and layout, support members 11 are welded. The jack is transferred to the area between the front end of the support member 11 at positions d and g and the bracket 21 under the tunnel boring machine 30. Following the translation method described above, the jack 40 retracts after each push to its maximum stroke, creating a gap at the end of the jack 40 facing away from the bracket 21. A section of jacking iron 12 is placed in this gap until the bracket 21 and the tunnel boring machine 30 are pushed to the preset turning position 2. Positions d and g are located at the rear end of the tunnel boring machine 30. The subway station has two parallel lines. The first line passes through the preset turning position 1 within the subway station, and the second line passes through the preset turning position 2 within the subway station.

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

[0087] After the shield machine 30 moves to the preset turning position 2, the 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; the 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 rotates 45° clockwise, the jacks 40 at the positions i and h are removed and transferred to the positions k and j, which are located at the rear end of the shield machine 30 at this time, wherein the position k is close to the outside of the shield machine 30 and the position j is close to the inside of the shield machine 30, and the pushing stroke of the jack 40 at the position k is greater than that of the jack 40 at the position j, so as to push the shield machine 30 and the bracket 21 to the inside, i.e. Figure 9 When the shield machine 30 rotates 45° clockwise again, the final 90° turning of the shield machine 30 and the bracket 21 in the clockwise direction is completed. At this time, the turning of the shield machine 30 is completed, and the head (front end) and the tail (rear end) of the shield machine 30 are exchanged, and the shield machine 30 rotates 180° in the clockwise direction in total. Of course, the shield machine 30 at this time only completes the turning and has not moved to the starting position of the second line. Figure 9 Figure 5 Figure 9

[0088] As shown in Figure 10 The support members 11 are welded at the positions l and m determined by the measurement and setting out, the jacks 40 are transferred between the support members 11 at the positions l and m and the bracket 21, and the jacks 40 are pushed once to put a section of the jack 12 between the jack 40 and the support member 11 according to the above translation mode until the 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 positions a to m are determined by the position information derived from the simulation of the turning path of the shield machine 30 by NAVISWORKS.

[0089] Step four: the specific execution process of the battery car and the trolley is as follows:

[0090] The bottom plate 533 of the turning platform 53 is made of 2cm-thick steel plates spliced, the bottom surface of the bottom plate 533 is ground with a bevel, a plurality of door-shaped supports 531 are made of 200H steel, and the plurality of door-shaped supports 531 are connected and fixed by the channel steel members 532. The jack 40 clamping groove 535 is welded on the bottom plate 533, the circular holes 536 are reserved on the walls of the clamping groove, a plurality of steel rails 534 are installed on the upper part of the door-shaped supports 531 to form the track of the turning platform 53, and the track of the turning platform 53 is connected and fixed with the external track through the track connecting plate 123.

[0091] Three support members 11 are welded at the positions determined by the setting out, and the support members 11 are reserved with circular holes for suspending the 10t pulley and fixing the steel wire rope 56; ​​​

[0092] Laying tracks in the originating side platform area 62, the receiving side platform area 63 and the turning area 64, which are the external tracks mentioned above, moving the matched trolley to the receiving side platform area 63 by the 1# electric trolley car;

[0093] Welding the stirrup made of profile steel at the end of the connecting bridge as support to keep the relative position of the connecting bridge and the 1# trolley unchanged, and removing the connecting pins between the trolleys;

[0094] Using the 1# electric trolley car to pull the 6# trolley to the turning platform 53, and locking and fixing the 1# electric trolley car and the 6# trolley wheels on the track of the turning platform 53 through the trolley limiting and fixing device 52;

[0095] First, using the 1# electric trolley car to pull the matched trolley from the initial position of the first line of the subway station to the receiving side platform area 63, using the 1# electric trolley car to pull the 6# trolley of the matched trolley close to the turning area 64 to the turning platform 53; by changing the position of the jack 40 and adjusting the stroke difference of the oil cylinder, the translation turning of the turning trolley is carried out, the track of the turning platform 53 after turning is connected with the track of the originating side platform area 62, the 6# trolley is pulled to the originating side platform area 62 by the 1# electric trolley car, then separated, and the turning platform 53 is horizontally translated to the initial position by the pulley system connected with the 1# electric trolley car. In this embodiment, Figure 12 The position of the turning platform 53 pushed by the two jacks 40 is the initial position, which is the preset turning position 1 in the shield tunneling machine 30 turning construction method shown in the figure. The left side of the initial position is the receiving side platform area 63, Figure 5 The initial position is the preset turning position 1 in the shield tunneling machine 30 turning construction method shown in the figure. The left side of the initial position is the receiving side platform area 63, Figure 12 The 1# electric trolley car is located in the originating side platform area 62, and the turning platform 53 is translated to the initial position by the pulley system.

[0096] Specifically: remove the connecting plate 123 between the track of the turning platform 53 and the external track, put the hydraulic jack 40 into the jack 40 slot of the turning platform 53, weld the support 11 at the predetermined position, and perform translational turning by changing the position of the jack 40 and adjusting the stroke difference of the oil cylinder. The construction method is basically the same as the turning construction method of the shield tunneling machine 30. After turning is completed, connect the track of the turning platform 53 with the track of the departure side platform area 62, use the 1# electric car to pull the 6# trolley to the departure side platform area 62, remove the track connecting plate 123 between the turning platform 53 and the departure side platform area 62, and put the steel wire rope 56 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. One side of the fixed pulley 55 is provided with a support 11, and the fixed pulley 55 and the support 11 are located at one end of the departure side platform area 62. The movable pulley 54 is arranged on the side of the turning platform 53 close to the fixed pulley 55, and is connected with the reserved round hole of the jack 40 slot at both ends of the turning platform 53 through the steel wire rope 56. One end of the steel wire rope 56 in the pulley system is fixed on the 1# electric car, and the other end is fixed on the support 11. Start the 1# electric car to horizontally translate the turning platform 53 to the initial position.

[0097] Connect the track of the turning platform 53 with the track of the receiving side platform area 63, use the 2# electric car to pull the 5# trolley onto the turning platform 53, and use the trolley limiting and fixing device 52 to fix the 5# trolley on the turning platform 53.

[0098] As shown in Figure 13 , remove the connecting plate 123 between the track of the turning platform 53 and the platform area track, suspend the movable pulley 54 at the slot position of the corner of the turning platform 53 close to the 4# trolley and the fixed pulley 55, put the steel wire rope 56 into the pulley block, connect one end of the steel wire rope 56 with the tail of the 1# electric car, and connect the other end with the support 11. Start the 1# electric car to pull the turning platform 53 and the 5# trolley to complete the turning and reach the preset turning position 3 shown in Figure 13 .

[0099] As shown in Figure 14 , move the movable pulley 54 at the slot on one end of the turning platform 53 to the slot on the left side of the end, connect the steel wire rope 56, and start the 1# electric car to pull the turning platform 53 and the 5# trolley to the preset turning position 4 shown in Figure 14 .

[0100] As shown in Figure 15 , move the movable pulley 54 at the slot to the side of the turning platform 53 close to the fixed pulley 55, connect the movable pulley 54 with the slot of the turning platform 53 with the steel wire rope 56, start the 1# electric car, pull the 5# trolley and the turning platform 53 to turn, and finally use the jack 40 to fine-tune to align the track of the turning platform 53 with the track of the departure side platform area 62.

[0101] The track of the turning platform 53 is connected with the track of the departure side platform area 62, the 5# trolley is pulled to the platform area by the 1# battery car, and then the turning platform 53 is translated and reset to the initial position by the same method as described above;

[0102] The rest of the supporting trolleys are turned in the order of 4#, 3#, 2#, 1# and the connecting bridge, and the turning process is the same as that of the 5# trolley described above;

[0103] The pins between all the trolleys and the connecting bridge are connected, the connecting bridge is finally connected with the shield machine 30, the pipelines are connected, and the shield machine 30 and the supporting trolleys are turned.

[0104] It should be noted that after the bottom plate is fully paved with steel plates, the surface height difference between adjacent steel plates is not more than ±2mm, the weld surface of the bracket 21, the support 11, the top iron 12 and the turning platform 53 should be cleaned before welding, the welding grade of the welding operation should reach level two, the bracket 21, the support 11, the top iron 12 and the turning platform 53 should be stress calculated and determined to be feasible by a qualified unit, the groove of the bottom plate of the bracket 21 and the base plate of the turning platform 53 should not be too thick and should be controlled within 5mm, the horizontal positioning deviation of the limiting block 13 and the support 11 should not be more than 1cm, the steel plate should be clean before installation, the shield machine 30 should be tested before turning with the trolley, and the reliability of the jack 40 and the pulley block should be ensured. The pulley block and the steel wire rope 56 should be matched, the ratio of the wheel diameter to the rope diameter should not be less than 16-28, the jack 40 should set the oil pressure alarm value to prevent overloading during the pushing process, the stroke and the position of the jack 40 during the turning process should be strictly controlled according to the simulated position, and the surrounding structure should be ensured to have a safety distance of more than 25cm.

[0105] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution falling within the concept of the present application belongs to the protection scope of the present application. It should be noted that some improvements and decorations without departing from the principles of the present application are also considered to be within the protection scope of the present application for ordinary technical personnel in the technical field.

Claims

1. A method for simulating a U-ban station shield tunneling path turning construction, characterized in that, The method comprises the following steps: Step 1: Path simulation A three-dimensional model of the subway station is established by using a physical simulation software, a plurality of constraint forces are set on the shield tunneling machine and the rear supporting trolley, and a shield tunneling machine turning path and a rear supporting trolley path are simulated and generated; Then, the three-dimensional model is imported into a test software, the simulated and generated movement paths are added, three-dimensional collision checking is performed, and constraint force position data is exported; Step 2: Construction preparation The required materials are first transported to the turning area; the bottom plate of the turning area is leveled; the turning area is fully paved with steel plates; support pieces, top irons and limit blocks required for turning are made; and a preset position is laid out; Step 3: Shield tunneling machine turning The shield tunneling machine is installed on a bracket so as to separate the shield tunneling machine from the rear supporting trolley; support pieces are installed based on the simulated shield tunneling machine turning path and the exported constraint force position data; jacks are installed between the support pieces and the bracket; and the bracket and the shield tunneling machine thereon are pushed by the jacks so that the shield tunneling machine moves to a target position according to the simulated shield tunneling machine turning path; Step 4: Rear supporting trolley turning A turning platform is made and moved to an initial position, which is one side of the turning area close to the receiving side platform area; one electric vehicle of the rear supporting trolley pulls one trolley of the rear supporting trolley onto the turning platform and fixes it; support pieces are installed based on the simulated rear supporting trolley path and the exported constraint force position data; jacks are installed between the support pieces and the turning platform; the turning platform is pushed by the jacks to turn and translate to one side of the turning area close to the departure side platform area; the electric vehicle and the trolley on the turning platform are unloaded to the departure side platform area, the electric vehicle pulls the turning platform to move to the initial position; the trolleys of the rear supporting trolley are fixed one by one on the turning platform, the electric vehicle of the departure side platform area pulls the turning platform with the fixed trolleys to move to the departure side platform area, and the trolleys of the rear supporting trolley in the receiving side platform area are moved to the departure side platform area.

2. The method according to claim 1, wherein the step of establishing a three-dimensional model of the subway station by using a physical simulation software comprises: a model of a side wall, a platform, a shield tunneling machine, a rear supporting trolley, a turning platform, a pulley block and an electric vehicle of the subway station is established by using a physical simulation software INTERACTIVE PHYSICS, wherein a plurality of constraint forces and monitoring points are set on the shield tunneling machine and the rear supporting trolley; the pulley block comprises a fixed pulley and a movable pulley, and a rope constraint is arranged between the pulley blocks. The step of simulating and generating a shield tunneling machine turning path comprises:

3. The method according to claim 2, wherein, when the shield tunneling machine is in a straight line stage, the defined two constraint forces are moved to symmetrical positions at the rear end of the shield tunneling machine, and a software is started to generate a movement path and a time; when the shield tunneling machine is in a turning stage, the position of one of the constraint forces is kept unchanged, the pushing position of the other constraint force is changed equidistantly, a plurality of turning movement paths are generated, a movement path with the largest distance from the side wall is selected, and constraint force positions are exported. ​ 4. The method according to claim 2, wherein, The step of generating the post-matching trolley path by simulation comprises: The post-matching trolley, the turning platform, the pulley set and the electric trolley are fixed by a constraint force, the post-matching trolley coordinates are preliminarily set, the defined constraint force is added to the electric trolley, the post-matching trolley is arranged on the turning platform, the turning platform is pulled by the pulley set connected with the electric trolley, the simulation is started, the post-matching trolley coordinates or the pulley set coordinates are changed at equal intervals, a plurality of post-matching trolley turning motion paths are generated, the motion path with the largest distance from the side wall is selected, and the constraint force position is derived.

5. The method according to claim 2, wherein, The step of performing three-dimensional collision checking comprises: according to the three-dimensional collision checking result, optimizing the motion path until all parts of the shield tunneling machine and the post-matching trolley do not collide with the side wall and the platform, finally generating the coordinate and constraint force position data of each stage, and exporting.

6. The method of claim 1, wherein the method further comprises: The step of presetting the position layout comprises: exporting the path parameters after simulation and collision checking to obtain the coordinates of the shield tunneling machine and the post-matching trolley at each stage, measuring the points by a total station instrument, and marking on the steel plate.

7. The method according to claim 1, wherein, The step of pushing the bracket and the shield tunneling machine thereon by the jack comprises: The bracket and the shield tunneling machine thereon are pushed by the jack arranged at the rear end of the bracket to move to a preset turning position 1; The bracket and the shield tunneling machine thereon are rotated by 90° in the clockwise direction by the jack arranged at the rear end and the outer side of the bracket; The bracket and the shield tunneling machine thereon are pushed by the jack arranged at the rear end of the bracket to move to a preset turning position 2; The bracket and the shield tunneling machine thereon are rotated by 90° in the clockwise direction again by the jack arranged at the rear end and the outer side of the bracket; The bracket and the shield tunneling machine thereon are pushed by the jack arranged at the rear end of the bracket to move to the target position, and the rotation turning of the shield tunneling machine is completed.

8. The method according to claim 7, wherein, The step of pushing the bracket and the shield tunneling machine thereon by the jack arranged at the rear end of the bracket comprises: The jack is installed between the bracket and the support, and the jack is fixed with the bracket; the jack is retracted after each pushing stroke, the top iron is supported between the jack and the support, and the process is repeated until the translation of the shield tunneling machine is completed.

9. The method according to claim 1, wherein, The step of moving the turning platform with the fixed trolley to the originating side platform area by the electric trolley of the originating side platform area comprises: Based on the post-matching trolley path generated by simulation and the derived constraint force position data, a support, a limiting block, a steel wire rope, a fixed pulley and a movable pulley are installed; the support, the limiting block and the fixed pulley are installed on the side of the turning area close to the originating side platform area; the movable pulley is installed on the turning platform; one end of the steel wire rope is connected with the electric trolley, passes through the fixed pulley and the movable pulley, and the other end is connected with the support; Based on the constraint force position data, the position of the movable pulley on the turning platform is adjusted, the turning platform is moved by the electric vehicle and rotated 180° in a clockwise direction until the turning platform is located at the originating side platform area.

10. The method of claim 1, wherein, The turning platform comprises a bottom plate, a plurality of door-shaped supports arranged on the bottom plate, and a plurality of steel rails arranged on the door-shaped supports; the bottom plate is provided with a plurality of jack clamping grooves for mounting the jacks.

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