CN116446923A - Superimposed shield tunnel support trolley and its pipe joint correction method and support method - Google Patents

Abstract

The invention discloses a support trolley for a superimposed shield tunnel, its pipe joint correction method, and a support method, which belong to the technical field of tunnel engineering. The support trolley includes a trolley body. The supporting feet, the trolley body is equipped with a measuring device for measuring the diameter of the pipe joint. The pipe joint correction method includes S1, measuring the initial pipe joint diameter Dn; S2, monitoring the change hole diameter Dn _t of the supporting foot corresponding to the pipe joint; S3, correcting according to the convergence value ΔDn. The support method includes S1, preset the number of initial pipe joint support in the down tunnel and arrange support trolleys; S2, stop excavation when the shield machine travels above the end of the end support trolley pipe joints, and all support trolleys move one pipe joint Section; S4, when the excavation of the shield machine is suspended again, all supporting trolleys move one pipe section again; S5, step S4 is repeated until the excavation of the uplink tunnel is completed. It can not only effectively support the down tunnel, but also correct the deformed pipe joint.

Description

Superimposed shield tunnel support trolley and its pipe joint correction method and support method

technical field

The invention relates to the technical field of tunnel engineering, in particular to a support trolley for a superimposed shield tunnel and a pipe joint correction method and support method thereof.

Background technique

With the increasing number of underground facilities, it is inevitable that new shield tunnels will be constructed close to the operating tunnels. Due to the limitations of surrounding environmental factors, in some sections, the spatial position of the two tunnels will be changed from horizontal parallel to vertical overlapping, that is, overlapping combined shield tunnel. From the engineering practice at home and abroad, there are few examples of superimposed tunnel projects with long distance and small clear distance, and they are mainly short-distance and small-angle superimposed cross tunnels. After the construction of the downlink shield tunnel is completed, the uplink shield tunnel will inevitably be disturbed and deformed during the construction of the uplink shield tunnel. In order to reduce the mutual influence of the superimposed tunnel construction, it is necessary to Support to minimize the impact of construction as much as possible. At present, for projects involving overlapping tunnels, the steel support system is mainly used for the support system in the completed tunnel, and the steel support supported on the segment is used to bear the external load and reduce the deformation of the segment. However, it is difficult to install and transport the steel support system in the tunnel, and it is impossible to correct the convergence of the segment when the deformation and convergence of the tunnel segment occurs, and the degree of intelligence is low.

For this reason, the patent number is "201510074563.X", and the patent name is "a support trolley and support trolley system for the construction of overlapping shield tunnels", which discloses a support trolley and a support trolley system, a support platform The car includes a frame body. The bottom of the frame body is provided with traveling wheels. The frame body is provided with a plurality of support cylinders arranged radially along the tunnel. A bracket is provided at the end of the support cylinder, and a rubber pad is provided on the end surface of the bracket. The frame body is also provided with a pump station for driving the supporting oil cylinder. By setting up several groups of supporting trolleys in the down tunnel, the pipe joints of the down tunnel can be supported to reduce the disturbance to the down tunnel when the shield excavates the up tunnel. The support trolley at the end starts to move the support trolley in turn to adapt to the progress of shield excavation. Compared with the traditional steel support system, the convenience of installation and transportation of the support trolley system has been greatly improved, but it is still impossible to correct the convergence of segment deformation, and the support trolley movement in the above support method The support method starts from the head end and moves according to the distance, and then moves in turn, and finally moves at the end.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned technical problems, and to provide a superimposed shield tunnel support trolley and its pipe joint correction method and support method. In addition, it can correct the pipe joints with convergent deformation, bear the additional stress brought by the construction of the uplink tunnel, ensure the safety of the downlink tunnel in real time and effectively, and reduce the deformation of the pipe joints.

In order to achieve the above object, the present invention provides the following solution: The present invention discloses a support trolley for a superimposed shield tunnel, which includes a trolley body capable of walking along the track of the tunnel, and the circumferential direction of the trolley body is uniformly arranged There are several pairs of telescopic support feet, and the two support feet in each pair are arranged symmetrically along the radial direction of the tunnel pipe joint. A measuring device for diameter.

Preferably, the trolley body includes a trolley bracket, the bottom of the trolley bracket is provided with a track wheel with a wheel locker, the top of the trolley bracket is fixed with a core shaft tube, and the core shaft tube The outer shell is provided with a bearing shaft tube, and the bearing shaft tube is rotatably connected with the core shaft tube, and the core shaft tube is provided with a brake for braking the bearing shaft tube. Arranged on the outer wall of the bearing shaft cylinder.

Preferably, the brake is an electro-hydraulic brake, a hydraulic servo controller is provided in the core shaft cylinder, and the electro-hydraulic brake is connected to the hydraulic servo controller through an oil pressure pipe.

Preferably, the supporting foot is a servo hydraulic jack, the telescoping end of the servo hydraulic jack is provided with an arc-shaped foot support, the fixed end of the servo hydraulic jack is fixedly connected to the outer wall of the bearing shaft cylinder, and the servo hydraulic jack The hydraulic jack is connected with the hydraulic servo controller through an oil pressure pipe.

Preferably, the measuring device includes a distance measuring device arranged circumferentially on the outer wall of the bearing shaft cylinder, and the distance measuring device corresponds to the number and arrangement position of the support feet.

Preferably, the distance measuring device is a laser displacement sensor or an ultrasonic distance measuring device.

Also disclosed is a method for correcting pipe joints of a superimposed shield tunnel, using the above-mentioned superimposed shield tunnel support trolley, including the following steps:

S1. Number several pairs of the supporting feet in sequence, measure the diameter of the pipe joint corresponding to each pair of the supporting feet through the measuring device, and record it as the initial hole diameter Dn, where n represents a certain pair number;

S2. Real-time monitoring of the diameter of the pipe joints corresponding to each pair of the support feet through the measuring device, and recorded as the changing hole diameter Dn _t , where t represents a certain moment;

S3. Through the formula ΔDn=Dn-Dn _t , the convergence value ΔDn of the pipe joints corresponding to each pair of the support legs at a certain moment is obtained, and when the convergence value ΔDn>0 of the corresponding pipe joints of a certain pair of the support legs, The pair of supporting legs grow synchronously, and the common growth amount is ΔDn. When ΔDn<0 of a certain pair of supporting legs, the pair of supporting legs does not need to be extended.

Also disclosed is a superimposed shield tunnel support method, comprising the following steps:

S1. Along the traveling direction of the shield in the upward tunnel, preset the number of initial pipe joint support in the overlapping section of the downward tunnel, and arrange supporting trolleys on the track below each pipe joint for support;

S2. Start the shield machine to excavate the upward tunnel, and pause the excavation when it travels above the end of the pipe section where the supporting trolley at the end is located, and the supporting trolley at the end starts to move all the supporting platforms The vehicle as a whole moves one pipe section in the direction of travel of the shield;

S4. Start the shield and continue excavation until the end of the supporting trolley is advanced to the end of the pipe joint, and the excavation is suspended, and the supporting trolley at the end starts to move all the supporting trolleys moving one pipe section in the traveling direction of the shield machine as a whole;

S5. Repeat the steps in step S4 until all the excavation of the overlapping section of the uplink tunnel and the downlink tunnel is completed.

Preferably, the initial pipe section support quantity is determined according to the disturbance range generated during the shield excavation process.

Preferably, the supporting trolley adopts the above-mentioned superimposed shield tunnel supporting trolley, and each superimposed shield tunnel supporting trolley corrects the pipe joints in time during the shield excavation process.

Compared with the prior art, the present invention has achieved the following technical effects:

1. Compared with the prior art, the support trolley in the present invention can detect the convergence value of the pipe joints of the completed down tunnel through the measuring device, and transmit the pressure to the pipe joints constantly through the support feet, Not only can it effectively support the pipe joints of the downlink tunnel, but it can also adjust the pressure in real time according to the change of the convergence value, so as to correct the convergent deformation of the pipe joints, ensure the safety of the downlink tunnel in real time and effectively, and reduce the construction process of the uplink tunnel. The disturbance in the tunnel will cause the deformation of the pipe section in the down tunnel.

2. The supporting trolley in the present invention can be loaded with constant pressure and adjusted in real time. Through the rotation of the bearing shaft cylinder, the hydraulic jack can apply a constant load to any position in the tunnel ring direction, and the distance measuring device arranged on the trolley can The device obtains the convergence value of the tunnel in real time, and dynamically adjusts the load value applied to the inner wall of the pipe joint, so as to balance the additional pressure brought by the construction of the upward tunnel on the pipe joint in the downlink tunnel, and ensure that the section shape of the downlink tunnel is consistent in real time and effectively. Overrun, the pipe joint structure is safe and stable.

3. The pipe joint correction method in the present invention compares the initial hole diameter of the down tunnel pipe joint with the real-time change diameter of the down tunnel pipe joint during the shield excavation process, and adjusts the applied load through the feedback convergence value , correspondingly load the pipe joints where the convergence changes occur, so as to correct the convergence changes of the pipe joints, with a high degree of intelligence.

4. In the support method of the present invention, the support trolley in the down tunnel, according to the progress of the shield tunneling in the up tunnel, can achieve continuous and uninterrupted support according to the ring, so that the support of the down tunnel can be carried out synchronously with the construction of the up tunnel , greatly guarantee the stability of the down tunnel segment, and at the same time support the way that the trolley moves according to the ring from the end to the head in turn, compared with the existing method of moving according to the distance from the head to the end in sequence, the present invention The method of moving pipe joints sequentially from the end to the head end makes the moving sequence more reasonable, the moving distance does not need to be calculated, it is simpler, and it is easy to popularize. The above-mentioned moving method has better synchronization.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is the side view structural schematic diagram of support trolley;

Fig. 2 is the schematic diagram of the front view of the AA' section of the supporting trolley in Fig. 1;

Fig. 3 is a schematic diagram of the supporting feet supporting the trolley;

Figure 4 is a schematic diagram of the support method.

Explanation of reference signs: 1. pipe joint; 2. track; 3. trolley bracket; 4. track wheel; 5. wheel locker; 6. core shaft tube; 7. bearing; 8. bearing shaft tube; 9. Flange A; 10. Flange B; 11. Flange bolts; 12. Servo hydraulic jack; 13. Connecting rod base; , target point; 18, displacement data acquisition box; 19, hydraulic servo controller; 20, oil pressure tube; 21, electro-hydraulic brake.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

This embodiment provides a support trolley for a superimposed shield tunnel, as shown in Figures 1 to 4, including a trolley body capable of walking along the track 2 in the tunnel, and several For the telescopic support feet, the two support feet in each pair are arranged symmetrically along the radial direction of the tunnel pipe section 1, and the trolley body is equipped with a measuring device for measuring the diameter of the pipe section 1 corresponding to each pair of support feet . There are at least two pairs of support legs. Referring to Figure 2, there are four pairs of support legs for a superimposed shield tunnel support trolley, that is, a total of eight support legs.

working principle

①Supporting process: After the trolley body moves along the track 2 of the down tunnel to the overlapping section overlapping with the up tunnel, the supporting legs are extended and pressed against the pipe joint 1 of the down tunnel, so as to support the overlapping section of the down tunnel. In order to reduce the disturbance to the downlink tunnel and reduce the deformation degree of the pipe section 1 of the downlink tunnel when the shield machine is excavating the overlapping section in the uplink tunnel.

② Correction process: The diameter of the pipe joint 1 supported by each pair of support feet can be measured in advance through the measuring device, and then the diameter of the pipe joint 1 supported by each pair of support feet during the shield mining process can be monitored in real time , and then compare the diameter measured in advance with the diameter measured at a later time, and get the amount of change. When the diameter measured later shrinks, increase the elongation of each pair of supporting legs, elongation If the sum of the quantities is the same as the variation, the pipe joint 1 can be corrected. If the diameter measured later becomes larger, no correction is required. It should be noted that the elongation of the two supporting legs in each pair of supporting legs must be the same.

In this embodiment, as shown in FIGS. 1 to 4 , the trolley body includes a trolley bracket 3 , the bottom of the trolley bracket 3 is provided with a track wheel 4 , and the track wheel 4 has a wheel locker 5 . The top of the trolley bracket 3 is fixed with a core shaft tube 6, which can be welded or bolted. In order to ensure that the core shaft tube 6 has sufficient support strength and rigidity, the wall thickness of the core shaft tube 6 is ≥ 50mm. The core shaft tube 6 is provided with a bearing shaft tube 8, and the bearing shaft tube 8 and the core shaft tube 6 are rotationally connected by a bearing 7, and the bearing 7 can be a ball bearing. The core shaft cylinder 6 is provided with a brake 21 for braking the bearing shaft cylinder 8 , and the supporting feet are circumferentially arranged on the outer wall of the bearing shaft cylinder 8 . By manually rotating the bearing cylinder 8 , the position of the pipe joint 1 corresponding to the supporting foot on the bearing cylinder 8 can be changed, and the bearing cylinder 8 is locked by the brake 21 .

Further, in this embodiment, as shown in Figures 1 to 4, the brake 21 is an electro-hydraulic brake, the core shaft cylinder 6 is provided with a hydraulic servo controller 19, and the electro-hydraulic brake communicates with the hydraulic servo controller 19 through the oil pressure tube 20 connect. The hydraulic servo controller 19 can be connected with the core shaft cylinder 6 through bolts, and provides oil pressure to the electro-hydraulic brake through the oil pressure pipe 20 . The electro-hydraulic brake can be connected to the outside of the core shaft cylinder 6 by welding or bolts.

In this embodiment, as shown in Figures 1 to 4, the supporting feet are servo hydraulic jacks 12, and the telescopic end of the servo hydraulic jack 12 is provided with an arc-shaped foot support 14, and the arc of the arc-shaped foot support 14 and the arc of the pipe joint 1 Correspondingly, the telescoping end of the curved foot support 14 and the servo hydraulic jack 12 can be fixed by welding, and the fixed end of the servo hydraulic jack 12 is fixed on the outer wall of the bearing shaft cylinder 8 . The servo hydraulic jack 12 is connected to the hydraulic servo controller 19 through the oil pressure pipe 20 , and the hydraulic servo controller 19 can provide oil pressure to the servo hydraulic jack 12 through the oil pressure pipe 20 . Preferably, a rubber pad can be provided on the end surface of the arc-shaped support 14 to avoid damage to the pipe joint 1 .

Further, in this embodiment, as shown in Figures 1 to 4, the fixed end of the servo hydraulic jack 12 is flange-connected to the bearing shaft cylinder 8, specifically, a flange A9 is provided on the outer wall of the bearing shaft cylinder 8 in advance, and used The flange A9 is fixed by the flange bolt 11, and the flange B10 is set at the fixed end of the servo hydraulic jack 12, and fixed by the flange bolt 11. Then the flange A9 and the flange B10 are fixed by ordinary bolts.

In order to improve the connection stability between the servo hydraulic jacks 12 , in this embodiment, as shown in FIG. 1 to FIG. 4 , the fixed ends of adjacent servo hydraulic jacks 12 are connected by a steel connecting rod 15 . Specifically, the connecting rod base 13 is pre-welded on the fixed end of each servo hydraulic jack 12 , and the two ends of the steel connecting rod 15 are respectively installed on the connecting rod bases 13 of two adjacent servo hydraulic jacks 12 .

In this embodiment, as shown in Figures 1 to 4, the measuring device includes a distance measuring device 16 arranged circumferentially on the outer wall of the bearing shaft cylinder 8, and the number and arrangement of the distance measuring device 16 and supporting feet (servo hydraulic jacks 12) corresponding to the location. Two relative distance-measuring devices measure the distance between it and the pipe joint 1, plus the diameter of the bearing shaft cylinder 8, it is the diameter of the pipe joint 1 at this time. The inner wall of the core shaft cylinder 6 is provided with a displacement data collection box 18 , and the displacement data collection box 18 is electrically connected with the distance measuring device 16 . The distance measuring device 16 transmits the displacement data to the displacement data collection box 18, and the displacement data collection box 18 is fixed on the core shaft cylinder 6 by bolts.

Further, in this embodiment, as shown in FIGS. 1 to 4 , the ranging device 16 is a laser displacement sensor or an ultrasonic ranging device. Considering cost and accuracy, laser displacement sensors are preferred. And in order to improve the test accuracy, the target point 17 can also be arranged on the pipe joint 1 in advance, and the target point 17 adopts an acrylic plate of 100mm×100mm, which can be fixed on the pipe joint 1 by glue connection.

Example 2

This embodiment provides a method for correcting pipe joints of a superimposed shield tunnel, using the superimposed shield tunnel supporting trolley as in Embodiment 1, as shown in Figures 1 to 4, including the following steps:

S1. Number several pairs of supporting feet in order, measure the diameter of the pipe joint 1 corresponding to each pair of supporting feet through the measuring device, and record it as the initial hole diameter Dn, n represents a certain pair number;

S2. Real-time monitoring of the diameter of the pipe joint 1 corresponding to each pair of supporting feet through the measuring device, and recorded as the changing hole diameter Dn _t , where t represents a certain moment;

S3. Through the formula ΔDn=Dn-Dn _t , the convergence value ΔDn of the pipe section 1 corresponding to each pair of support legs at a certain moment is obtained. When the convergence value ΔDn>0 of the corresponding pipe section 1 of a certain pair of support feet, the pair The supporting legs grow synchronously, and the common growth amount is ΔDn. When ΔDn<0 of a pair of supporting legs, the pair of supporting legs does not need to be extended.

work process:

Take the superimposed shield tunnel supporting trolley equipped with four pairs (eight) of supporting feet as an example (refer to Figure 2 and Figure 3):

Number the four pairs of supporting feet of the superimposed shield tunnel supporting trolley in sequence, and record them as 1, 2, 3, and 4 in sequence, and record the initial hole diameter (diameter) at the pipe joint 1 corresponding to the four pairs of supporting feet as D1 , D2, D3, D4. The supporting trolley of the superimposed shield tunnel begins to apply load to the pipe section 1, and collects the convergence value of the pipe section 1 in real time through the measuring device on the trolley. diameter) are D1 _t , D2 _t , D3 _t , D4 _t . The convergence values ΔD1, ΔD2, ΔD3, and ΔD4 of the support trolley for the superimposed shield tunnel are obtained by the formula ΔDn=Dn-Dn _t . The calculation process is as follows:

ΔD1=D1- _D1t ;

ΔD2=D2- _D2t ;

ΔD3=D2- _D2t ;

ΔD4 = D2 - D2 _t .

The loading strategy is that when the convergence value is positive, that is, ΔDn>0, the load is increased in the direction, and the increase of each pair of supporting feet is ΔDn. When the convergence value is negative, that is, ΔDn<0, there is no need to increase the load in this direction. That is, if ΔD1>0, the pair of supporting legs numbered 1 is extended, and the growth amount of the two supporting legs is ΔD1 in total. It should be noted that the growth of the two supporting legs is the same.

Example 3

This embodiment provides a superimposed shield tunnel support method, as shown in Figures 1 to 4, including the following steps:

S1. Along the traveling direction of the shield in the uplink tunnel, preset the number of initial pipe joint support in the overlapping section of the downlink tunnel, and arrange supporting trolleys on the track 2 below each pipe joint 1 for support, each The number of support trolleys under the pipe joint 1 is set according to the actual construction support requirements, as preferably, one support trolley is set under each pipe joint 1;

S2. Start the shield to excavate the upward tunnel, and stop the excavation when it travels above the end of the pipe section 1 where the supporting trolley at the end is located, and the supporting trolley at the end starts to move all the supporting trolleys towards the shield as a whole Move one pipe section 1 in the direction;

S4. Start the shield machine and continue excavation until it reaches above the end of the pipe section 1 where the supporting trolley at the end is located, and then stop excavation, and then the supporting trolley at the end starts to move all the supporting trolleys towards the direction of shield tunneling as a whole Move a pipe section 1;

S5. Repeat the steps in step S4 until all the excavation of the overlapping section of the uplink tunnel and the downlink tunnel is completed.

The support trolley mentioned above can be selected from the support trolley in the prior art, or the support trolley of the superimposed shield tunnel in Embodiment 1 can be selected, but the existing support trolley does not have the correction function, so if it is necessary to correct function, the superimposed shield tunnel supporting trolley in Embodiment 1 is required.

work process:

Taking the overlapping section of the uplink tunnel and the downlink tunnel as 100m as an example, the number of supporting trolleys can be selected from 8 to 12. Here, 8 trolleys are taken as an example. The total length of support is eight pipe sections 1, usually the length of pipe section 1 is 1.2 m, so the total length of support can be regarded as 8X1.2=9.6m, refer to Figure 4:

① Number the 8 supporting trolleys sequentially as 1, 2, 3...8.

②The shield tunneling of the uplink tunnel is excavated from the direction of the small mileage to the direction of the long mileage, and the supporting trolleys of the downlink tunnel can be sent into the tunnel in advance from the end shaft from the direction of the large mileage, and then pre-arranged one by one from the direction of the large mileage to the direction of the small mileage, When the predetermined supporting position is in place, the supporting legs are extended to support and pressurize the pipe joint 1. That is, the No. 1 supporting trolley moves to the overlapping section first, and moves to the bottom of the pipe section 1 at the head end of the overlapping section, that is, the first pipe section 1 of the preset initial pipe section, and then No. 2 to 8 supporting trolleys enter in sequence, and correspond to The second pipe section 1 to the eighth pipe section 1.

③The excavation of the shield tunnel in the uplink tunnel starts, and when the uplink tunnel is excavated to the end of the eighth ring pipe section 1, the excavation is suspended, the support feet of the No. Move one ring of pipe joint 1, then the support foot of No. 8 support trolley extends and applies the specified load to pipe joint 1 again, and then No. 7 support trolley depressurizes and moves forward one ring and starts to pressurize, progressively until 1 No. supporting trolley is loaded.

④Start the shield machine to continue the excavation, and the shield machine in the upward tunnel advances one ring forward, and repeat the operation in step ③ to complete the depressurization-reloading cycle.

In this embodiment, as shown in FIGS. 1 to 4 , the number of initial pipe joint support is determined according to the disturbance range generated during the shield excavation process. If the shield excavation disturbance is about 9m, it can support 8 pipe joints 1, 8X1.2m=9.6m. If the shield excavation disturbance is about 12m, it can support 10 pipe joints 1, 10X1.2m12m. and so on.

Further, in this embodiment, as shown in Figures 1 to 4, the supporting trolley adopts a superimposed shield tunnel supporting trolley in Embodiment 1, and each superimposed shield tunnel supporting platform is The vehicle should correct the deformation of pipe joint 1 in time, and the correction method can be the method in embodiment 2.

work process:

Still taking the above overlapping section as 100m and the number of supporting trolleys as 8 as an example, each supporting trolley has 4 pairs of supporting legs:

That is, before the 8 supporting trolleys support the pipe joint 1 in step ②, first use the measuring device to measure the diameter and distance of the pipe joint 1 corresponding to the 4 pairs of supporting feet on the supporting trolleys No. 1 to No. 8 , to obtain the initial diameter R1 ~ R4.

During the progress of the shield in step ③, the measuring devices on No. 1 to No. 8 support trolleys should _monitor the changes of the four pairs _of support feet in real time. ΔDn=Dn-Dn _t obtains the convergence values ΔD1, ΔD2, ΔD3, and ΔD4 of the supporting trolleys of the superimposed shield tunnel, and corrects them according to the positive and negative values of ΔD1. With the excavation of the upward shield tunnel, the trolley at the corresponding position of the downward tunnel starts to load, so that the synchronous support of the downward tunnel and the construction of the upward tunnel are carried out simultaneously.

In step ④, the shield in the ascending tunnel advances one ring forward, repeating the operation in step ③ to complete the cycle of decompression-reloading-monitoring-real-time load adjustment.

In the present invention, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention; meanwhile, for those of ordinary skill in the art, according to the present invention The idea of the invention will have changes in the specific implementation and scope of application. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. The utility model provides a coincide shield tunnel supporting trolley, its characterized in that, including the platform truck body that can follow the track walking in tunnel, a plurality of pairs of supporting legs that can stretch out and draw back have evenly been laid to the circumference of platform truck body, two in every pair the supporting legs sets up along the radial symmetry of tunnel tube coupling, be equipped with on the platform truck body and be used for measuring every to the measuring device of tube coupling department diameter size that the supporting legs corresponds.

2. The superimposed shield tunnel supporting trolley according to claim 1, wherein the trolley body comprises a trolley support, a rail wheel with a wheel locking device is arranged at the bottom of the trolley support, a nuclear mandrel is fixed at the top of the trolley support, a bearing mandrel is sleeved outside the nuclear mandrel, the bearing mandrel and the nuclear mandrel are connected in a rotating manner through a bearing, a brake for braking the bearing mandrel is arranged on the nuclear mandrel, and the supporting feet are circumferentially arranged on the outer wall of the bearing mandrel.

3. The superimposed shield tunnel supporting trolley according to claim 2, wherein the brake is an electro-hydraulic brake, a hydraulic servo controller is arranged in the core shaft tube, and the electro-hydraulic brake is connected with the hydraulic servo controller through an oil pressure pipe.

4. The superimposed shield tunnel supporting trolley according to claim 3, wherein the supporting leg is a servo hydraulic jack, an arc-shaped foot support is arranged at the telescopic end of the servo hydraulic jack, the fixed end of the servo hydraulic jack is fixedly connected to the outer wall of the bearing shaft barrel, and the servo hydraulic jack is connected with the hydraulic servo controller through an oil pressure pipe.

5. The superimposed shield tunnel supporting trolley according to claim 2, wherein the measuring device comprises distance measuring devices circumferentially arranged on the outer wall of the bearing shaft, and the distance measuring devices correspond to the number and arrangement positions of the supporting feet.

6. The superimposed shield tunnel support trolley of claim 5, wherein the distance measuring device is a laser displacement sensor or an ultrasonic distance measuring device.

7. A method for correcting a pipe joint of a superimposed shield tunnel, which adopts the superimposed shield tunnel supporting trolley according to any one of claims 1 to 6, and is characterized by comprising the following steps:

s1, numbering a plurality of pairs of supporting legs in sequence, measuring the diameter of a pipe joint corresponding to each pair of supporting legs through the measuring device, and marking as an initial hole diameter Dn, wherein n represents a certain pair of numbers;

s2, monitoring the diameters of the pipe joints corresponding to each pair of supporting legs in real time through the measuring device, and recording the diameters as the changed hole diameter Dn _t T represents a certain moment;

s3, through the formula delta Dn=Dn-Dn _t Obtaining the convergence value delta Dn of the pipe joint corresponding to each pair of supporting legs at a certain moment, and when the convergence value delta Dn of the corresponding pipe joint of a certain pair of supporting legs>0, the pair of support legs synchronously grow by a total amount of DeltaDn whenΔDn of a certain pair of the supporting feet<0, the pair of support legs need not be elongated.

8. The method for supporting the superimposed shield tunnel is characterized by comprising the following steps of:

s1, presetting initial pipe joint support quantity in an overlapped section of a downlink tunnel along the traveling direction of a shield in the uplink tunnel, and arranging a support trolley on a track below each pipe joint for support;

s2, starting the shield to excavate an uplink tunnel, suspending the excavation when the tunnel is moved to the position above the tail end of the pipe joint where the tail end supporting trolley is located, and starting to move all supporting trolleys integrally to the shield moving direction by one pipe joint by the tail end supporting trolley;

s4, starting the shield to continue excavation until the shield moves to the position above the tail end of the pipe section where the tail end of the supporting trolley is located, suspending excavation, and starting to move all the supporting trolleys integrally to the shield moving direction by one pipe section by the tail end of the supporting trolley;

s5, repeating the step in the step S4 until all the overlapped sections of the uplink tunnel and the downlink tunnel are excavated.

9. The method of overlapping shield tunnel support according to claim 8, wherein the number of initial pipe section supports is determined according to a disturbance range generated during the shield excavation process.

10. A method for supporting a superimposed shield tunnel according to claim 8, wherein the supporting trolley is a superimposed shield tunnel supporting trolley according to any one of claims 1 to 6, and each superimposed shield tunnel supporting trolley corrects the pipe joint in time during the shield excavation.