CN110725688A - Planar sliding propulsion device of shield machine - Google Patents
Planar sliding propulsion device of shield machine Download PDFInfo
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- CN110725688A CN110725688A CN201910594128.8A CN201910594128A CN110725688A CN 110725688 A CN110725688 A CN 110725688A CN 201910594128 A CN201910594128 A CN 201910594128A CN 110725688 A CN110725688 A CN 110725688A
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- 230000003068 static effect Effects 0.000 claims description 38
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- 238000005299 abrasion Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
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Abstract
The invention aims to overcome at least one defect in the prior art, and provides a plane sliding propulsion device of a shield tunneling machine, which comprises a supporting frame, a seat plate, a plurality of sliding assemblies, a plurality of resistance-increasing assemblies and a counter-force device, wherein the seat plate is arranged on the upper side of the supporting frame and used for supporting the shield tunneling machine; when the telescopic device is contracted, the resistance increasing assembly is started to reduce resistance, so that the acceleration of the shield tunneling machine relative to the base plate is smaller than the acceleration of the support frame relative to the ground. The propelling device provided by the invention changes the friction force between the propelling device and the ground according to different propelling processes, can realize continuous propelling, further saves energy consumption and reduces construction cost.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a plane sliding propulsion device of a shield tunneling machine.
Background
In recent years, with the rapid development of cities, the urban subway construction is rapidly developed, the urban rail transit construction is more hot, the main mode adopted by the urban subway construction at present during shield tunneling construction is adopted, but when some complex geology is met, other construction methods are required to construct a tunnel, and when a shield machine is constructed to the tunnel which is already excavated, the shield machine needs to be pushed to pass through the tunnel section which is already excavated. In order to ensure that the shield machine pushes through the excavated tunnel section smoothly, a concrete guide table in the excavated tunnel is used as a shield body support, steel rails laid on the guide table are used as shield body walking rails, two hydraulic jacks are used as shield body propelling power, reaction holes are formed in guide rails, and a reaction frame matched with the reaction holes is matched to push the shield body to move forwards on the rails. The publication number is CN102337900A discloses a circulating cushion type shield machine idle pushing method, the device sets a bracket at the bottom of the shield machine, two rows of vertical jacks are set at two sides, a horizontal jack transmits force with the bracket through a counterforce device, the horizontal jack transmits force to push the shield machine to move forward on the bracket, then the vertical jack is started to lift the shield machine, the horizontal jack contracts to push the bracket to move forward, the contracting vertical jack shield machine falls on the bracket to repeat the forward pushing, the bracket moves forward and the ground sliding friction easily causes damage to the bracket because the bracket contacts with the ground, and the shield machine generally reaches up to kiloton, the bracket can move forward by completely supporting the shield machine from the bracket by means of external large hydraulic lifting equipment, the construction efficiency is low in practical engineering, the repeated utilization rate is low, the consumption is large, and the manufacturing cost is high.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art and provides a plane sliding propulsion device of a shield tunneling machine, so as to realize the purposes of continuous propulsion and improvement of the propulsion efficiency.
The technical scheme adopted by the invention is that the plane sliding propulsion device of the shield tunneling machine comprises a supporting frame, a seat plate, a plurality of sliding assemblies, a plurality of resistance increasing assemblies and a counterforce device, wherein the seat plate is arranged on the upper side of the supporting frame and is used for supporting the shield tunneling machine;
the sum of the mass of the shield tunneling machine and the telescopic device is MdThe mass of the supporting frame is MzcThe mass of the seat board is MzbMass of the sliding component is MgMass of the resistance-increasing component is MzzMass of the reaction device is Mf(ii) a The friction coefficient of the shield tunneling machine and the seat plate is UdzThe friction coefficient of the seat board and the supporting frame is UzzThe friction coefficient of the sliding component and the ground is UgdCoefficient of friction of the resistance-increasing member with the groundIs UzdG is the gravitational acceleration, F is the outward thrust and inward contraction force of the telescopic device respectivelytAnd FsThe contact part of the ground and the sliding component bears the pressure sum of FgThe sum of the pressure borne by the ground and the contact part of the resistance-increasing component is Fz；
Maximum static friction force F between shield tunneling machine and base platedz＝Md·G×UdzGreater than the maximum static friction force F of the seat plate and the supporting framezz＝(Md+Mzb)·G×UzzAnd M isd+Mzc+Mzb+Mg+Mzz+Mf＝Fg+Fz，Ugd＜Uzd；
Thrust at the telescopic device is FtIn the state of (1): (1)
in a state where the retractor contraction force is Fs: (2)
the supporting frame is mainly used for bearing the shield machine at the upper end and supporting the shield machine on the ground. The seat board can be fixed in the sliding grooves of the supporting frame by arranging the sliding grooves on two sides of the supporting frame. The sliding assembly and the resistance increasing assembly are arranged at the bottom of the supporting frame, friction force between the resistance increasing assembly and the ground is increased and reduced by adjusting the resistance increasing assembly, and then the absolute value of displacement acceleration between the shield tunneling machine and the supporting frame is controlled when the shield tunneling machine and the supporting frame are subjected to thrust or pulling force, so that the shield tunneling machine is pushed forwards.
The counterforce device is mainly used as an acting force fulcrum for pushing the shield tunneling machine on the support, wherein the advancing direction of the shield tunneling machine is a head end, the other end of the shield tunneling machine is a tail end, the counterforce device can be fixed at the tail end of the supporting frame through a threaded fixing piece or a sliding groove clamp or other modes, the counterforce device can be embedded into the tail end of the supporting frame through a nested mode and the like, the telescopic device for pushing the shield tunneling machine to advance is pushed, one end of the telescopic device is connected with the counterforce device, the other end of the telescopic device.
The method is characterized in that when the propelling is needed, the relative movement between the propelling device and the ground is minimum, so that the relative movement displacement of the shield machine relative to the ground is maximum, therefore, the friction force between the propelling device and the ground needs to be increased when the propelling is needed, and most preferably, the maximum static friction force between the resistance-increasing assembly and the ground is increased to be more than or equal to the sum of the thrust required by the acceleration when the shield machine is started forwards and the friction force between a seat plate and a support frame on the lower side of the shield machine. After the one-time propulsion is completed, the propulsion device needs to move forwards, the propulsion device can be driven to move forwards by utilizing the contraction force generated when the expansion device contracts, in order to reduce the friction force between the propulsion device and the ground, the resistance-increasing component needs to contract, the friction force between the resistance-increasing component and the ground is reduced, the gravity parts of the shield machine, the seat plate and the support frame borne by the resistance-increasing component are transferred to the sliding component, the friction coefficient between the sliding component and the ground is far smaller than that between the resistance-increasing component and the ground, and the mass of the shield machine is far heavier than the sum of the masses of the support frame, the sliding component and the resistance-increasing component. When the telescopic device contracts, the same direction and opposite direction of the pulling force borne by the shield machine and the pushing force borne by the supporting frame are achieved, the displacement acceleration of the shield machine is the pulling force which is reduced from the friction force of the base plate and the supporting frame to the weight of the shield machine and the base plate, the displacement acceleration of the supporting frame, the resistance increasing assembly and the sliding assembly is the friction force of the base plate and the supporting frame which is reduced from the pulling force, the friction force of the sliding assembly and the ground is reduced from the sliding assembly to the resistance increasing assembly and the ground, and the quality of the supporting frame, the sliding assembly, the resistance increasing assembly and the counter-force device is. Therefore, the friction force between the resistance-increasing device and the ground is reduced, and when the output thrust of the telescopic device is constant, the displacement acceleration of the supporting frame, the sliding assembly and the resistance-increasing assembly can be increased; the shrinkage resistance-increasing component reduces the friction force between the resistance-increasing component and the ground, the telescopic device begins to shrink until the displacement acceleration of the support frame, the sliding component and the resistance-increasing component is greater than the acceleration of the shield machine, then the shield machine moves backwards, the support frame, the sliding component, the resistance-increasing component and the counter-force device move forwards, and the backward relative displacement distance of the shield machine is smaller than the forward movement distance of the support frame, the sliding component, the resistance-increasing component and the counter-force device. And the shield machine and the propelling device move forwards relative to the ground by combining two sliding processes.
Furthermore, braced frame is including locating the bedplate downside, with the parallel backup pad of bedplate and the cardboard that multiunit perpendicular to backup pad and interval set up, and every group cardboard includes the first cardboard and the second cardboard of two parallels, the subassembly that slides includes the gyro wheel and locates the gyro wheel both ends, is used for installing the gyro wheel the roller shaft of gyro wheel, two the roller shaft rotate with first cardboard and second cardboard respectively and be connected.
The supporting plate and the transverse cross-sectional view of the vertical direction of the clamping plates are integrally H-shaped, the supporting plate is horizontally arranged, a plurality of groups of clamping plates are arranged on the bottom surface of the supporting plate, each group of clamping plates comprises a first clamping plate and a second clamping plate, an installation position is formed between the first clamping plate and the second clamping plate, and the sliding assembly is arranged in the installation position. Besides the roller form, the sliding component can be realized in other forms, such as a plurality of small rollers arranged on the roller shaft, and other similar devices capable of realizing the sliding of the propelling device are within the protection scope of the invention.
The both sides of backup pad still are equipped with the cardboard integrated into one piece or fixed connection's of both sides baffle, the upside of backup pad is located to the baffle, the relative bedplate of baffle has certain vertical height for prevent that the shield constructs the machine and sideslips, can also avoid the lateral sliding of bedplate simultaneously, make the bedplate can only realize the removal around.
Furthermore, be equipped with the bull wheel subassembly that the multiunit is used for reducing frictional force between backup pad and the bedplate in the backup pad, the backup pad upside is provided with the runner groove, the bull wheel subassembly includes a plurality of runners and locates the axis of rotation at runner both ends, the axis of rotation is connected with the side rotation in runner groove.
The rotating wheel assembly is arranged on the supporting plate, when the support is arranged on the supporting plate, the rotating wheel assembly plays a role in supporting the support, and when the support moves relative to the supporting plate, the friction force between the supporting plate and the seat plate is reduced through the rotation of the rotating wheel assembly. The runner groove is a groove which is arranged on the upper side of the supporting plate and is concave inwards. The rotating wheel assemblies are longitudinally arranged in multiple rows along the shield advancing direction, preferably, a row of rotating wheel assemblies are respectively arranged at the left end, the right end and the middle part of the supporting plate, and the number of rotating wheels arranged on each group of rotating wheel assemblies is more than or equal to 2, preferably 3. The rotating wheel and the rotating wheel shaft can be integrally formed, and only the rotating wheel shaft is in rotating connection with the inner side of the rotating wheel groove; or the two are in rotating connection, and the rotating wheel shaft is fixedly connected with the inner side of the rotating wheel groove.
Preferably, the resistance-increasing component is a jack.
The resistance-increasing component can be a telescopic supporting device.
Furthermore, scalable strutting arrangement includes top supporting component and installs in top supporting component below, is used for increasing or reducing the telescopic end supporting component who increases the biggest stiction power of resistance-increasing subassembly and ground, when needs increase the biggest stiction power of resistance-increasing subassembly and ground, when end supporting component and the biggest stiction power on ground, end supporting component contracts.
The adjustment of thrust point bottom of the propelling device can be realized by adjusting the bottom supporting component, when the bottom supporting component is extended, partial pressure of the sliding component is transferred to the resistance increasing component to be born, the resistance increasing component plays a main stress role, and partial pressure born by the resistance increasing component is transferred to the sliding component when the bottom supporting component is shortened, so that the sliding component plays a main supporting role, and the sum of the two and the ground friction force is reduced. Therefore, by adjusting the telescopic amount of the resistance increasing assembly, the stress of the sliding assembly and the resistance increasing assembly can be balanced, and the flexible adjustment of the friction force between the propelling device and the ground is realized.
Furthermore, the upper portion of bedplate is equipped with the recess that prevents the shield structure machine side direction rolling, is equipped with the rubber pad that increases the shield structure machine and the biggest static friction power of recess in the recess, prevents that shield structure machine and bedplate from producing vertical relative movement under the effect of thrust and pulling force.
Because the shield machine generally has larger mass and can greatly influence the whole excavation propulsion once the lateral displacement occurs, the shield machine can be longitudinally arranged in the groove by arranging the longitudinal groove in the middle of the seat plate and protruding the two sides of the longitudinal groove at a certain height, and the protruding parts on the two sides of the support form the baffle, so that the lateral rolling of the shield machine can be effectively avoided, and the propulsion process is more stable. The shape of the groove can be designed according to the shape of the shield machine, so that the groove is more attached to the shield machine, and the shield machine is kept to be stably pushed. Through setting up the rubber pad can increase frictional force, reduce the wearing and tearing between the rigid structure.
Further, the counterforce device is a metal plate fixed at the tail end of the propelling device. Preferably, the metal plate is a rectangular steel plate. Through with steel sheet vertical fixation at braced frame's tail end, telescoping device one end is fixed on the steel sheet, forms the stress point of telescoping device, realizes that the shield constructs the machine and promotes forward.
Furthermore, the telescopic device is a hydraulic pushing cylinder which provides pushing force and pulling force for the shield machine, so that the continuous pushing of the shield machine is realized.
The invention also provides a plane sliding propulsion method of the shield tunneling machine, which is realized by utilizing the propulsion device; the propulsion method comprises the following steps:
when the telescopic device extends and advances, the resistance increasing assembly is started to increase resistance, so that the acceleration of the shield tunneling machine relative to the seat plate is greater than the acceleration of the support frame relative to the ground;
when the telescopic device is contracted, the resistance increasing assembly is started to reduce resistance, so that the acceleration of the shield tunneling machine relative to the base plate is smaller than the acceleration of the support frame relative to the ground.
Specifically, the sum of the mass of the shield tunneling machine and the telescopic device is MdThe mass of the supporting frame is MzcThe mass of the seat board is MzbMass of the sliding component is MgMass of the resistance-increasing component is MzzMass of the reaction device is Mf(ii) a The friction coefficient of the shield tunneling machine and the seat plate is UdzThe friction coefficient of the seat board and the supporting frame is UzzThe friction coefficient of the sliding component and the ground is UgdThe friction coefficient of the resistance increasing component and the ground is UzdG is the gravitational acceleration, F is the outward thrust and inward contraction force of the telescopic device respectivelytAnd FsThe contact part of the ground and the sliding component bears the pressure sum of FgThe sum of the pressure borne by the ground and the contact part of the resistance-increasing component is Fz；
The propulsion method comprises the following steps:
s1: sliding the plane of the shield tunneling machine on a seat plate of the propelling device, and fixing a telescopic device at one end of the shield tunneling machine and a counter-force device;
s2: starting the resistance-increasing component to increase resistance, so that the maximum static friction force between the resistance-increasing component and the ground is increased, and the maximum static friction resistance (F) between the shield tunneling machine plane sliding propulsion device and the ground is increasedmzd) Satisfies the following conditions:
s3: stopping the resistance-increasing component to continuously increase the maximum static friction value between the resistance-increasing component and the ground, starting the telescopic device and applying a thrust Ft1Pushing the shield tunneling machine and the seat plate to move forward to finish a propelling step pitch, and stopping propelling of the telescopic device;
s4: starting the resistance-increasing component to reduce resistance, so that the maximum static friction resistance between the resistance-increasing component and the ground is reduced, and the maximum static friction resistance (F) between the shield tunneling machine plane sliding propulsion device and the ground is reducedmzd) Satisfies the following conditions:
s5: stopping the resistance increasing assembly to reduce the resistance; starting the telescopic means with a contraction force Fs1Starting to contract to finish a contraction cloth pitch;
s6: and repeating the steps S2, S3, S4 and S5 until the shield machine reaches the designated position.
Furthermore, the resistance increasing mode of the resistance increasing assembly in the step S2 is to extend the height of the bottom supporting assembly and increase the stress of the resistance increasing assembly; in the step S3, stopping the resistance-increasing component to continuously increase the maximum static friction force between the resistance-increasing component and the ground is realized by stopping extending the height of the bottom support component; in step S4, the maximum static friction resistance between the resistance-increasing assembly and the ground is reduced by shortening the height of the bottom support assembly.
Further, in the step S2, the resistance increasing assembly is started to increase the resistance, so that the static friction force between the resistance increasing assembly and the ground is greater than or equal to the sum of the thrust force required by the acceleration when the shield machine is started forward and the friction force between the seat plate and the support frame on the lower side of the shield machine.
Further, in step S4, the resistance-increasing assembly is started to reduce the resistance, so that the static friction force between the resistance-increasing assembly and the ground is less than or equal to the sum of the thrust force required by the acceleration when the shield machine is started forward and the friction force between the seat plate and the support frame on the lower side of the shield machine.
Further, the propulsion method also comprises the step of arranging the plane sliding propulsion device of the shield tunneling machine on the processed road surface.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the sliding assembly and the resistance-increasing assembly are arranged at the bottom of the supporting frame at the same time, so that the maximum static friction force between the propelling device and the ground can be flexibly adjusted according to different propelling processes, the propelling speed can be adjusted, the supporting function conversion among different parts can be realized, and the service life of the propelling device can be prolonged.
(2) The propelling device changes the maximum static friction force between the propelling device and the ground according to different propelling processes, realizes the circulating continuous propelling of the propelling device and the whole shield tunneling machine through the extending and contracting functions of the hydraulic cylinder of the shield tunneling machine, fully utilizes resource machinery and reduces the additional manufacturing cost of the mechanical device.
(3) According to the shield machine, the groove is formed in the middle of the support, the two sides of the groove are protruded, so that the shield machine can be longitudinally arranged in the groove, the protruded parts on the two sides of the support form the baffle, the shield machine can be effectively prevented from rolling laterally, and the propelling process is more stable.
(4) According to the invention, the pressure born by the sliding component and the resistance-increasing component is adjusted, all friction forces of the supporting device are changed, and the difference of displacement acceleration of the propelling device and the shield tunneling machine is controlled, so that the shield tunneling machine is smoothly propelled forwards.
(5) Compared with the prior art, the invention can ensure that the vertical displacement of the shield machine and the sliding assembly does not need to occur, reduce the output of vertical force and avoid the lifting and the reduction of the vertical displacement of the shield machine by means of large-scale lifting equipment due to the overweight of the shield machine.
(6) According to the propelling method, the maximum static friction force between the propelling device and the ground can be realized in different propelling processes only by adjusting the extension and retraction of the resistance-increasing assembly, the stress conversion between the resistance-increasing assembly and the sliding assembly can be realized by adjusting the height of the resistance-increasing assembly, the operation is simple, the abrasion to the bottom of the propelling device is reduced, the service life is prolonged, the contraction force of the telescopic device is utilized, the waste of energy consumption is reduced, and the propelling efficiency is improved.
Drawings
Fig. 1 is a schematic perspective view of a propulsion device according to the present invention.
Fig. 2 is a schematic structural diagram of the propelling device provided by the invention after a shield tunneling machine is installed.
Fig. 3 is a schematic side view of the propulsion device of the present invention.
Fig. 4 is an enlarged schematic view of the wheel assembly of fig. 1.
Fig. 5 is a schematic view of the bottom structure of the propulsion device of the present invention.
Fig. 6 is a schematic structural diagram of a resistance increasing assembly according to the present invention.
Fig. 7 is another schematic view of the bottom structure of the propulsion device of the present invention.
Fig. 8 is a schematic view of a plane sliding propulsion method of the shield tunneling machine.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
The embodiment provides a plane sliding propulsion device of a shield tunneling machine, which can realize continuous propulsion and improve the propulsion efficiency.
The technical scheme adopted by the invention is that as shown in the combined drawings 1-2, the plane sliding propulsion device of the shield tunneling machine comprises a support frame 1, a seat plate 2 arranged on the upper side of the support frame 1 and used for supporting the shield tunneling machine 10, a plurality of sliding assemblies 3 and a plurality of resistance increasing assemblies 4 arranged on the lower side of the support frame 1, and a counterforce device 5 arranged at the tail end of the support frame 1, wherein one end of the shield tunneling machine 10 is provided with a telescopic device 6, and the telescopic device (6) is a hydraulic push cylinder which provides thrust and tension for the shield tunneling machine. The hydraulic pushing cylinder 6 is supported by the counterforce device 5 to realize the propelling of the shield tunneling machine 10;
the sum of the mass of the shield machine 10 and the mass of the hydraulic push cylinder 6 is MdThe support frame 1 has a mass MzcThe mass of the seat board 2 is MzbMass of the sliding component 3 is MgThe mass of the resistance-increasing component 4 is MzzThe mass of the reaction device 5 is Mf(ii) a The friction coefficient of the shield tunneling machine 10 and the seat plate 2 is UdzThe friction coefficient of the seat board 2 and the supporting frame 1 is UzzThe friction coefficient of the sliding component 3 and the ground is UgdThe friction coefficient of the resistance increasing component 4 and the ground is UzdG is the gravitational acceleration, and F is the outward thrust and inward contraction force of the hydraulic push cylinder 6 respectivelytAnd FsThe contact part of the ground and the sliding component 3 bears the pressure sum of FgThe pressure sum of the contact part of the ground and the resistance increasing component 4 is Fz；
The maximum static friction force F between the shield machine 10 and the seat plate 2dz＝Md·G×UdzIs larger than the maximum static friction force F of the seat board 2 and the supporting frame 1zz＝(Md+Mzb)·G×UzzAnd M isd+Mzc+Mzb+Mg+Mzz+Mf＝Fg+Fz，Ugd＜Uzd；
The thrust of the hydraulic push cylinder 6 is FtIn the state of (1): (1)
in a state where the contraction force of the hydraulic push cylinder 6 is Fs: (2)
further, as shown in fig. 1, fig. 3 and fig. 5, the supporting frame 1 includes a supporting plate 11 disposed at the lower side of the seat plate 2 and parallel to the seat plate 2, and a plurality of sets of clamping plates 12 perpendicular to the supporting plate and disposed at intervals, each set of clamping plates 12 includes two parallel first clamping plates 121 and second clamping plates 122, the sliding assembly 3 includes a roller 31 and roller shafts 32 disposed at two ends of the roller and used for mounting the roller 31, and the two roller shafts 32 are respectively rotatably connected with the first clamping plates 121 and the second clamping plates 122.
The both sides of backup pad still are equipped with the cardboard integrated into one piece or fixed connection's of both sides baffle 13, the upside of backup pad is located to baffle 13, the relative bedplate of baffle 13 has certain vertical height for prevent that the shield constructs the machine and sideslips, can also avoid the lateral sliding of bedplate simultaneously, make the bedplate can only realize fore-and-aft removal.
Further, as shown in fig. 1 and 4, a plurality of sets of rotating wheel assemblies 7 for reducing friction between the supporting plate 11 and the seat plate 2 are disposed on the supporting plate 11, a rotating wheel groove 20 is disposed on the upper side of the supporting plate 11, the rotating wheel assemblies 7 include a plurality of rotating wheels 71 and rotating shafts 72 disposed at two ends of the rotating wheels 71, and the rotating shafts are rotatably connected with the side surfaces of the rotating wheel grooves 20.
Furthermore, the resistance-increasing component 4 is a telescopic supporting device.
Further, as shown in fig. 6 to 7, the retractable supporting device includes a top supporting component 41 and a retractable bottom supporting component 42 installed below the top supporting component 41 and used for increasing or decreasing the maximum static friction force between the resistance-increasing component 4 and the ground, when the maximum static friction force between the resistance-increasing component 4 and the ground needs to be increased, the bottom supporting component 42 extends, and when the maximum static friction force between the resistance-increasing component 4 and the ground needs to be decreased, the bottom supporting component 42 retracts.
Further, as shown in fig. 1-2, a groove 30 for preventing the shield tunneling machine 10 from rolling laterally is arranged at the upper part of the seat plate 2, and a rubber pad (not shown) for increasing the maximum static friction force between the shield tunneling machine and the groove is arranged in the groove, so as to prevent the shield tunneling machine and the seat plate from moving longitudinally relative to each other under the action of thrust and tension. Further, as shown in fig. 2, the reaction device 5 is a metal plate fixed to the rear end of the propulsion device. Preferably, the metal plate is a rectangular steel plate. The steel plate is vertically fixed at the tail end of the supporting frame, and one end of the hydraulic pushing cylinder is fixed on the steel plate to form a stress point of the hydraulic pushing cylinder, so that the shield tunneling machine is pushed forwards.
Example 2
The invention also provides a plane sliding propulsion method of the shield tunneling machine, which is realized by utilizing the propulsion devices shown in the figures 1-7; as shown in fig. 8, the propulsion method includes:
when the telescopic device 6 is extended and pushed, the resistance increasing assembly 4 is started to increase resistance, so that the acceleration of the shield tunneling machine 10 relative to the seat plate 2 is larger than the acceleration of the support frame 1 relative to the ground;
when the telescopic device 6 is contracted, the resistance increasing assembly 4 is started to reduce resistance, so that the acceleration of the shield tunneling machine 10 relative to the seat plate 2 is smaller than the acceleration of the support frame 1 relative to the ground.
Specifically, the sum of the mass of the shield tunneling machine 10 and the mass of the telescopic device 6 is MdThe support frame 1 has a mass MzcThe mass of the seat board 2 is MzbMass of the sliding component 3 is MgThe mass of the resistance-increasing component 4 is MzzThe mass of the reaction device 5 is Mf(ii) a The friction coefficient of the shield tunneling machine 10 and the seat plate 2 is UdzThe friction coefficient of the seat board 2 and the supporting frame 1 is UzzThe friction coefficient of the sliding component 3 and the ground is UgdThe friction coefficient of the resistance increasing component 4 and the ground is UzdG is the gravitational acceleration, and F is the outward thrust and inward contraction force of the hydraulic push cylinder 6 respectivelytAnd FsThe contact part of the ground and the sliding component 3 bears the pressure sum of FgThe pressure sum of the contact part of the ground and the resistance increasing component 4 is Fz；
The propulsion method comprises the following steps:
s1: sliding the shield tunneling machine 10 on a seat plate 2 of the propelling device in a plane, and fixing a telescopic device 6 at one end of the shield tunneling machine 10 and a counterforce device 5;
s2: starting the resistance-increasing component 4 to increase the resistance, so that the maximum static friction force between the resistance-increasing component 4 and the ground is increased, and the maximum static friction resistance (F) between the plane sliding propulsion device of the shield machine 10 and the ground is increasedmzd) Satisfies the following conditions:
s3: stopping the resistance-increasing component 4 to continuously increase the maximum static friction value of the resistance-increasing component 4 and the ground, starting the telescopic device and applying a thrust Ft1Pushing the shield tunneling machine 10 and the seat plate 2 to move forward to finish a propelling step pitch, and stopping propelling of the telescopic device;
s4: starting the resistance-increasing component 4 to reduce resistance, so that the maximum static friction resistance between the resistance-increasing component 4 and the ground is reduced, and the maximum static friction resistance (F) between the plane sliding propulsion device of the shield machine 10 and the ground is reducedmzd) Satisfies the following conditions:
s5: stopping the resistance increasing assembly 4 to reduce the resistance; starting the telescopic device 6, the contraction force F thereofs1Starting to contract to finish a contraction cloth pitch;
s6: and repeating the steps S2, S3, S4 and S5 until the shield tunneling machine 10 reaches the designated position.
Further, in step S4, the maximum static friction force between the resistance increasing assembly 4 and the ground is reduced to 0, so that the telescopic device 6 is started to contract after the resistance increasing assembly 4 is separated from the ground.
Further, in the step S2, the resistance increasing manner of the resistance increasing assembly 4 is to extend the height of the bottom supporting assembly 42, so as to increase the stress of the resistance increasing assembly 4; in the step S3, stopping the resistance increasing assembly 4 to continuously increase the maximum static friction value between the resistance increasing assembly 4 and the ground is realized by stopping extending the height of the bottom supporting assembly 42; in step S4, the maximum static friction resistance between the resistance-increasing assembly 4 and the ground is reduced by shortening the height of the bottom support assembly 42.
Further, in the step S2, the resistance increasing assembly 4 is started to increase the resistance, so that the static friction force between the resistance increasing assembly and the ground is greater than or equal to the sum of the thrust force required by the acceleration when the shield machine is started forward and the friction force between the seat plate and the support frame on the lower side of the shield machine.
Further, in step S4, the resistance-increasing assembly 4 is started to reduce the resistance, so that the static friction force between the resistance-increasing assembly and the ground is less than or equal to the sum of the thrust force required by the acceleration when the shield machine is started forward and the friction force between the seat plate and the support frame on the lower side of the shield machine.
Further, the propulsion method further comprises the step of arranging the plane sliding propulsion device of the shield tunneling machine 10 on the processed road surface.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. The plane sliding propulsion device of the shield tunneling machine is characterized by comprising a supporting frame (1), a seat plate (2) arranged on the upper side of the supporting frame (1) and used for supporting the shield tunneling machine (10), a plurality of sliding assemblies (3) and a plurality of resistance increasing assemblies (4) arranged on the lower side of the supporting frame (1), and a counterforce device (5) arranged at the tail end of the supporting frame (1), wherein one end of the shield tunneling machine (10) is provided with a telescopic device (6), and the telescopic device (6) is supported by the counterforce device (5) to realize propulsion of the shield tunneling machine (10);
the sum of the mass of the shield machine (10) and the mass of the telescopic device (6) is MdThe mass of the supporting frame (1) is MzcThe mass of the seat board (2) is MzbThe mass of the sliding component (3) is MgThe mass of the resistance increasing component (4) is MzzThe mass of the reaction device (5) is Mf(ii) a The friction coefficient of the shield tunneling machine (10) and the seat plate (2) is UdzThe friction coefficient of the seat board (2) and the supporting frame (1) is UzzIs slippedThe coefficient of friction of the component (3) with the ground is UgdThe friction coefficient of the resistance increasing component (4) and the ground is UzdG is the gravitational acceleration, F is the outward thrust and inward contraction force of the telescopic device (6) respectivelytAnd FsThe contact part of the ground and the sliding component (3) bears the pressure sum of FgThe contact part of the ground and the resistance increasing component (4) bears the pressure sum of Fz；
The maximum static friction force F of the shield machine (10) and the seat plate (2)dz＝Md·G×UdzIs larger than the maximum static friction force F of the seat board (2) and the supporting frame (1)zz＝(Md+Mzb)·G×UzzAnd M isd+Mzc+Mzb+Mg+Mzz+Mf＝Fg+Fz，Ugd＜Uzd；
The thrust of the expansion device (6) is FtIn the state of (1):
in a state where the contraction force of the expansion device (6) is Fs:
2. the propulsion device according to claim 1, wherein the supporting frame (1) comprises a supporting plate (11) which is arranged on the lower side of the seat plate (2) and is parallel to the seat plate (2), and a plurality of sets of clamping plates (12) which are arranged perpendicular to the supporting plate and are spaced apart from each other, each set of clamping plates (12) comprises two parallel first clamping plates (121) and second clamping plates (122), the sliding assembly (3) comprises a roller (31) and roller shafts (32) which are arranged at two ends of the roller and are used for installing the roller (31), and the two roller shafts (32) are respectively and rotatably connected with the first clamping plates (121) and the second clamping plates (122).
3. The propulsion device according to claim 2, characterized in that the supporting plate (11) is provided with a plurality of sets of rotating wheel assemblies (7) for reducing the friction between the supporting plate (11) and the seat plate (2), the upper side of the supporting plate (11) is provided with a rotating wheel groove (20), the rotating wheel assemblies (7) comprise a plurality of rotating wheels (71) and rotating shafts (72) arranged at two ends of the rotating wheels (71), and the rotating shafts (72) are rotatably connected with the side surfaces of the rotating wheel groove (20).
4. A propulsion device according to claim 1, characterised in that the resistance-increasing assembly (4) is a jack.
5. A propulsion device according to claim 1, characterised in that the resistance-increasing assembly (4) is a telescopic support device.
6. The propulsion device according to claim 5, characterized in that the telescopic support device comprises a top support assembly (41) and a telescopic bottom support assembly (42) mounted below the top support assembly (41) for increasing or decreasing the maximum static friction of the resistance-increasing assembly (4) with the ground, the bottom support assembly (42) being extended when it is desired to increase the maximum static friction of the resistance-increasing assembly (4) with the ground, and the bottom support assembly (42) being retracted when it is desired to decrease the maximum static friction of the resistance-increasing assembly (4) with the ground.
7. The propulsion device according to claim 1, characterized in that the upper part of the seat plate (2) is provided with a groove (30) for preventing the shield machine (10) from rolling laterally, and a rubber pad for increasing the maximum static friction force between the shield machine and the groove is arranged in the groove for preventing the shield machine and the seat plate from moving longitudinally relative to each other under the action of thrust and tension.
8. A propulsion device according to claim 1, characterised in that the counterforce device (5) is a metal plate fixed to the rear end of the propulsion device.
9. The propulsion device of claim 8, wherein the metal plate is a rectangular steel plate.
10. The propulsion device according to claim 1, characterized in that the telescopic device (6) is a hydraulic thrust cylinder which provides thrust and tension for the shield machine, so as to realize continuous propelling of the shield machine.
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| CN201910594128.8A CN110725688B (en) | 2019-07-03 | 2019-07-03 | Planar sliding propulsion device of shield machine |
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| CN201910594128.8A CN110725688B (en) | 2019-07-03 | 2019-07-03 | Planar sliding propulsion device of shield machine |
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