CN220687327U - Underwater retractable heading machine system - Google Patents

Abstract

The utility model relates to an underwater retractable tunneling machine system which comprises a shield body device and a water isolation device, wherein the shield body device comprises a shield body outer shell which is vertically arranged and is provided with two ends, a shield body inner shell which is provided with two ends and is provided with an opening is detachably connected in the shield body outer shell through a connecting piece, a folding cutter disc is arranged at the top of the shield body inner shell, and the outer diameter of the folding cutter disc after being folded is smaller than the inner diameter of the shield body outer shell. The water isolation device comprises a sealing cover with an accommodating cavity with an opening at the bottom, a hollow pipe is detachably connected to the top of the sealing cover, and the sealing cover can be connected with the top of the shield body shell in a sealing way after the folding cutter disc is folded. A first steel cable wire is arranged in the hollow pipe in a penetrating mode, the first steel cable wire can be connected with the folding cutter head, and the inner shell of the shield body and the folding cutter head can be driven to move downwards after the connecting piece is removed. The underwater rollback type heading machine system can realize the underwater sealing of the heading equipment and the underwater rollback of the heading equipment, and solves the problems of difficult construction and low construction efficiency of an underwater shaft.

Description

Underwater retractable heading machine system

Technical Field

The utility model relates to the technical field of tunnel construction, in particular to an underwater retractable heading machine system.

Background

There are many thermal power plants, nuclear power plants, petrochemical plants and the like in coastal and river-like areas, a large number of water taking and draining tunnels are needed to provide cooling water and drain sewage, a plurality of water taking and draining shafts are needed to be arranged on each submarine tunnel for accessing seawater, and coastal areas are expected to have wide market prospect in shaft construction and urgent requirements for underwater shaft construction.

The existing construction method of the deep sea water taking and draining vertical shaft comprises a vertical jacking technology and an island cofferdam construction method. The vertical jacking technology is based on the soil squeezing principle, and the jacking process has large disturbance to the soil layer and cannot be applied to deep buried strata or rock strata. The island cofferdam construction method is used for isolating water by constructing a cofferdam, and constructing a vertical shaft in the enclosure structure, but the construction method is greatly influenced by offshore environment, has high construction cost and long construction period; in addition, the equipment is difficult to disassemble after finishing, and large hoisting equipment is usually required to disassemble and hoist the equipment, so that the process is complex and has a certain construction risk.

Accordingly, the present inventors have developed an underwater retractable heading machine system to overcome the shortcomings of the prior art by years of experience and practice in the relevant industry.

Disclosure of Invention

The utility model aims to provide an underwater rollback type heading machine system which can realize underwater sealing of heading equipment and underwater rollback of the heading equipment, and solves the problems of difficult construction and low construction efficiency of an underwater vertical shaft.

The object of the utility model is achieved by an underwater retractable heading machine system comprising:

the shield body device comprises a shield body outer shell which is vertically arranged and is provided with two open ends, a shield body inner shell which is provided with two open ends is detachably connected in the shield body outer shell through a connecting piece, a folding cutter disc is arranged at the top of the shield body inner shell, and the outer diameter of the folding cutter disc after being folded is smaller than the inner diameter of the shield body outer shell;

the water isolation device comprises a cover with an accommodating cavity with an opening at the bottom, a hollow pipe which can be communicated with the accommodating cavity is detachably connected to the cover top of the cover, and the cover can be connected with the top of the shield body shell in a sealing way after the folding cutterhead is folded; a first steel cable wire is arranged in the hollow pipe in a penetrating mode, the first steel cable wire can be connected with the folding cutter head, and the inner shell of the shield body and the folding cutter head can be driven to move downwards after the connecting piece is removed.

In a preferred embodiment of the utility model, an upper waterproof ring groove is formed in the top of the shield shell, a lower waterproof ring groove is formed in the bottom of the sealing cover, the upper waterproof ring groove can be in butt joint with the lower waterproof ring groove to form a waterproof ring groove, and a sealing ring is embedded in the waterproof ring groove.

In a preferred embodiment of the utility model, the cover is connected to the shield body housing by means of lateral bending bolts.

In a preferred embodiment of the utility model, the switch valve is arranged on the top of the sealing cover, and the hollow tube is detachably connected with the switch valve.

In a preferred embodiment of the utility model, the hollow tube is formed by splicing a plurality of sections of tube bodies.

In a preferred embodiment of the utility model, a plurality of guide wheels are detachably mounted on the bottom of the inner shell of the shield body.

In a preferred embodiment of the present utility model, the folding cutterhead includes a cutterhead main body and a plurality of folding parts, the cutterhead main body is connected with the top of the shield inner shell, the folding parts are arranged at intervals along the circumference of the cutterhead main body, the folding parts are hinged to the edge of the cutterhead main body through rotating shafts, and cutters are arranged on the tunneling surface of the cutterhead main body and the tunneling surface of the folding parts.

In a preferred embodiment of the present utility model, when the folding cutterhead is in an unfolded state, the folding cutterhead can be connected with the second steel cable, and the folding parts can be turned upwards to a position attached to the tunneling surface of the cutterhead main body by pulling back the second steel cable upwards.

In a preferred embodiment of the present utility model, the bottom of the cutter head body is provided with a driving device for driving the folding cutter head to rotate.

In a preferred embodiment of the utility model, a soil bin is formed in the cutterhead main body, and an opening communicated with the soil bin is formed on the tunneling surface of the cutterhead main body; the bottom of the cutter head main body is connected with a slag discharging pipe, and a pipe clamping valve is arranged on the slag discharging pipe.

By the aid of the water isolation device, after the main shaft structure is constructed, the water isolation device is arranged on the shield shell in a sealing mode, the inner structure of the tunneling machine is isolated from a water body, and underwater sealing of tunneling equipment is achieved. Simultaneously, utilize the first steel cable line that runs through hollow tube and closing cap and be connected with folding blade disc to hang down tunnelling equipment to main tunnel, realized the back in the tunneller underwater well, solved the tunneller and constructed the difficult problem of shaft under water, wholly improved shaft and constructed efficiency, and simple structure, construction process is simple.

Drawings

The following drawings are only for purposes of illustration and explanation of the present utility model and are not intended to limit the scope of the utility model. Wherein:

fig. 1: the underwater retractable heading machine system provided by the utility model is used for upwards constructing a schematic diagram of a vertical shaft.

Fig. 2: the underwater retractable heading machine system is a schematic diagram of the retractable heading machine system after the folding cutterhead is retracted.

Fig. 3: the underwater retractable heading machine system is a schematic diagram of the underwater retractable heading machine system after the marine isolation device is installed.

Fig. 4: the underwater retractable heading machine system provided by the utility model is a schematic diagram when the heading equipment is retracted in a well.

Fig. 5: the underwater retractable heading machine system provided by the utility model is a schematic diagram after the retraction of the heading equipment is completed.

Fig. 6: the utility model provides a first action schematic diagram when a vertical shaft is constructed by using an upward pipe jacking method.

Fig. 7: the second action diagram is provided for the utility model when the vertical shaft is constructed by the upward pipe jacking method.

Fig. 8: the utility model provides a third action schematic diagram when the vertical shaft is constructed by using the upward pipe jacking method.

Reference numerals illustrate:

1. a shield body housing;

2. a shield inner shell; 21. a connecting piece;

3. folding a cutter head; 31. a cutterhead main body; 311. a soil bin; 32. a folding part; 33. a driving device;

4. a cover; 41. a seal ring; 42. an outer bending bolt; 43. a switch valve;

5. a hollow tube;

6. a first steel cord;

7. a slag discharge pipe; 71. a pinch valve;

8. shaft pipe joints;

9. a main tunnel; 91. and (5) an oil cylinder.

Detailed Description

For a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings.

As shown in fig. 1 to 8, the present application provides an underwater retractable heading machine system, comprising:

the shield body device comprises a shield body shell 1 which is vertically arranged and is provided with two open ends, a shield body shell 2 which is detachably connected with the two open ends through a connecting piece 21 is arranged in the shield body shell 1, a folding cutter disc 3 is arranged at the top of the shield body shell 2, and the outer diameter of the folding cutter disc 3 after being folded is smaller than the inner diameter of the shield body shell 1;

the water isolation device comprises a cover 4 with an accommodating cavity with an opening at the bottom, a hollow pipe 5 which can be communicated with the accommodating cavity is detachably connected to the cover top of the cover 4, and the cover 4 can be in sealing connection with the top of the shield body shell 1 after the folding cutterhead 3 is folded; a first steel cable wire 6 is arranged in the hollow tube 5 in a penetrating way, the first steel cable wire 6 can be connected with the folding cutter head 3, and can drive the shield inner shell 2 and the folding cutter head 3 to move downwards after the connecting piece 21 is removed.

The shield body outer shell 1 and the shield body inner shell 2 are cylindrical structures with openings at the upper end and the lower end, and are connected through a connecting piece 21 (such as a bolt) so as to facilitate disassembly of the tunneling equipment for rollback after shaft tunneling is completed. The whole system is mainly used for deep sea drainage wells, sewage drainage wells and the like. When in construction, the waterproof device is not installed, the folding cutterhead 3 is in an unfolding state, and stratum can be excavated upwards from the main tunnel 9 to a preset height; after the shaft is driven to the designed elevation, the folding cutterhead 3 is folded, the outer diameter of the folded folding cutterhead 3 is smaller than the inner diameter of the shield shell 1, and the installation of a subsequent water isolation device and the downward rollback of later driving equipment can be facilitated; connecting a hollow pipe 5 on the sealing cover 4, enabling the first steel cable line 6 to pass through the hollow pipe 5 and the sealing cover 4, and sealing and connecting the sealing cover 4 with the shield shell 1 after a diver connects the first steel cable line 6 with a hanging point of the folding cutterhead 3; next, the connecting piece 21 is disassembled, the separation of the shield body inner shell 2 and the shield body outer shell 1 is completed, the crane on the water surface transportation equipment is operated to lower the first steel cable 6, and the folding cutter head 3 and the shield body inner shell 2 can be driven to move downwards together, so that the in-hole rollback of tunneling equipment (internal devices such as the folding cutter head 3 and a host machine) is realized.

From this, entry driving machine system in this application through setting up water proof device, accomplishes the back at shaft main body structure construction, through sealing installation water proof device on shield body shell 1, makes entry driving machine's inner structure and water keep apart, has realized that the tunnelling equipment seals under water. Simultaneously, utilize the first steel cable line 6 that runs through hollow tube 5 and closing cap 4 and be connected with folding blade disc 3 to hang down the excavating equipment to main tunnel 9, realized the interior back of entry driving machine underwater well, solved the entry driving machine and constructed the difficult problem of shaft under water, wholly improved shaft and constructed efficiency, and simple structure, construction process is simple.

In a specific implementation manner, in order to facilitate the sealing between the sealing cover 4 and the shield shell 1, an upper waterproof ring groove is provided at the top of the shield shell 1, a lower waterproof ring groove is provided at the bottom of the sealing cover 4, the upper waterproof ring groove can be abutted with the lower waterproof ring groove to form a waterproof ring groove, and a sealing ring 41 is embedded in the waterproof ring groove. The cover 4 is attached to the shield housing 1 during installation by corresponding fasteners, preferably lateral bending bolts 42.

The whole sealing cover 4 can be a semi-closed columnar cylinder body or can be in a spherical shape or other shapes capable of covering the folding cutter head 3; the sealing ring 41 is arranged in the groove, so that the sealing waterproof performance of the shield body is ensured after the shield body is connected and closed with the shield body housing 1. The sealing cover 4 is connected with the shield body shell 1 by adopting the outside bending bolt 42 to enable grooves of the sealing cover 4 and the shield body shell to be opposite to each other, so that the sealing ring 41 is tightly extruded, a good sealing self-waterproof structure is finally formed between the shield body shell 1 and the sealing cover 4, and construction safety is guaranteed.

Further, an opening/closing valve 43 is mounted on the top of the cover 4, and the hollow tube 5 is detachably connected to the opening/closing valve 43. The hollow tube 5 is formed by splicing a plurality of sections of tube bodies.

The on-off valve 43 may be, for example, a ball valve, provided at the top center of the cover 4. When the crane on water surface transportation equipment such as a ship is utilized to sink the sealing cover 4, the upper end of the ball valve is connected with the hollow pipe 5 (such as threaded opposite screwing connection), the hollow pipe 5 can be split into a plurality of sections which are connected with each other (such as when the water depth is deep) and extend to the upper part of the water surface, so that water leakage can not occur in the construction process. Then, a plurality of steel cable wires are penetrated in the hollow pipe 5, and the ball valve is opened, so that the first steel cable wire 6 is lowered and connected with a hanging point on the folding cutter disc 3, and the insulation from external water is ensured all the time when the equipment is hung down and retreated.

The hoisting water-proof device is connected with the shield shell 1, so that underwater receiving of tunneling equipment is realized, and references are provided for underwater construction of a vertical shaft; meanwhile, the steel rope penetrating through the hollow pipe 5 and the sealing cover 4 and connected with the folding cutter head 3 is used for hanging the tunneling equipment down to the main tunnel 9, so that the in-well rollback of the tunneling equipment is realized, the rollback mechanism is simple and practical, and the rollback construction efficiency is integrally improved.

In a preferred embodiment, a plurality of guide wheels are detachably mounted on the bottom of the inner shell 2 of the shield body in order to facilitate smooth retraction of the tunneling device during the lifting process. During construction, a plurality of guide wheels can be arranged at the lower end of the shield body inner shell 2 before retraction, so that the shield body inner shell rolls along the inner wall of the shaft pipe joint 8 below, and equipment can be retracted smoothly while guiding.

Further, referring to fig. 1, the folding cutterhead 3 includes a cutterhead main body 31 and a plurality of folding portions 32, the cutterhead main body 31 is connected with the top of the shield inner shell 2, the folding portions 32 are arranged at intervals along the circumferential direction of the cutterhead main body 31, the folding portions 32 are respectively hinged to the edge of the cutterhead main body 31 through rotating shafts, and cutters are respectively arranged on the tunneling surface of the cutterhead main body 31 and the tunneling surface of the folding portions 32.

When the folding cutterhead 3 is in the unfolded state, earth formations can be excavated upwards by cutters on the driving face of the cutterhead body 31 and on the driving face of the plurality of folds 32. The outer diameter of the cutter head main body 31 is smaller than the inner diameter of the shield body outer shell 1, in this embodiment, the inner wall of the shield body outer shell 1 is closely attached to the outer wall of the shield body inner shell 2, the inner diameter of the shield body outer shell 1 is close to the outer diameter of the shield body inner shell 2, and the outer diameter of the cutter head main body 31 is smaller than the outer diameter of the shield body inner shell 2; when the folding cutterhead 3 is in the unfolded state, the plurality of folding portions 32 can be turned upwards to the position where the tunneling surface of the cutterhead main body 31 is attached by taking the respective rotating shaft as the axial direction, so that the outer diameter of the folded cutterhead is smaller than the outer diameter of the shield inner shell 2, and the subsequent rollback is not affected.

Preferably, when the folding cutterhead 3 is in the unfolded state, the folding cutterhead 3 can be connected with the second steel cable, and the plurality of folding parts 32 can be turned upwards to a position which is attached to the driving surface of the cutterhead main body 31 by pulling back the second steel cable upwards by taking the respective rotating shafts as axial directions.

After the vertical shaft is driven to the designed elevation, the diver submerges the water bottom and pulls the folding part 32 back by the second steel cable wire to rotate towards the center of the folding cutter head 3 for shrinkage folding, so that the installation of the water isolation device and the downward rollback of the later driving equipment are facilitated. Folding cutter head 3 is folded through the pull-back steel cable line, and the structure is simpler, and the operation is simpler and more convenient. It will be appreciated that the second wire would include a plurality of wires, each connected to a corresponding fold 32 to effect the fold 32 to fold inwardly about the axis of rotation by pulling back the wire to effect the reduction in diameter.

Referring to fig. 1, the bottom of the cutter head body 31 is provided with a driving device 33 for driving the folding cutter head 3 to rotate. The driving device 33 may be, for example, a driving motor.

Further, referring to fig. 1, a soil bin 311 is formed in the cutterhead main body 31, and an opening communicated with the soil bin 311 is formed on the tunneling surface of the cutterhead main body 31; the bottom of the cutterhead main body 31 is connected with a slag discharging pipe 7, and a pinch valve 71 is arranged on the slag discharging pipe 7.

The cutter head main body 31 is fixedly connected with the top of the shield inner shell 2, the soil bin 311 and the shield inner shell 2 form a whole body which can block external water, and the holes on the cutter head main body 31 can be used for flowing cut sludge or external water into the soil bin 311 and then discharging the sludge or external water through the slag discharging pipe 7. In the construction process, after the closing cap 4 is connected with the shield shell 1, a water body exists in a closed space formed between the closing cap 4 and the shield shell, at the moment, after the water body enters the soil bin 311 through the opening, water also enters the soil bin 311 if entering water exists in the hollow pipe 5, and then the water body can be discharged into the main tunnel 9 through the pinch valve 71 and the slag discharging pipe 7, so that safety risks of tunneling equipment in the downward rollback process are avoided.

A plurality of sealing rings are generally clamped between the outer wall of the shield body housing 1 and the outer wall of the shield body housing 2. The sealing rings are distributed along the axial direction of the shield body shell 1 at intervals, the outer wall of the shield body shell 2 and the inner wall of the shield body shell 1 are sealed through the sealing rings, and external muddy water can be prevented from leaking into the inside of the heading machine or the built vertical shaft under the state that the water isolation device is not installed (namely, in the upward tunneling process of the folding cutterhead 3).

More specifically, the method for performing shaft construction by using the heading machine system comprises the following steps:

s1, upward construction shaft of heading machine

As shown in fig. 1, the heading machine in the main tunnel 9 is used for constructing a vertical shaft through an upward pipe jacking method or a shield method, specifically, the driving device 33 drives the folding cutter head 3 to rotate to excavate a stratum, slag discharge is dynamically controlled through the pinch valve 71, and the vertical shaft structure is constructed upwards.

The construction process of the concrete upward pipe jacking method or the shield method can adopt any existing mode, for example, when the upward pipe jacking method is adopted, the steps shown in fig. 6 to 8 can be also adopted, and when the design of each ring vertical shaft pipe joint 8 is more in blocks, the pipe joint assembling jacking can be realized only by alternately using a plurality of oil cylinders 91; firstly, one to two oil cylinders 91 (namely the oil cylinders 91 below a certain pipe block) are retracted downwards, then pipe joint blocks are assembled on the retracted oil cylinders 91, after the installation is completed, the oil cylinders 91 are supported upwards, then the oil cylinders 91 below the rest pipe blocks are retracted continuously, the steps are repeated to realize the assembly of the whole pipe joint, and finally the oil cylinders 91 integrally lift up the pipe joint to realize tunneling.

S2, contracting and folding cutter head 3

As shown in fig. 2, after the construction of the shaft main body structure is completed, a diver is immersed to the water to connect a second steel cable line with the folding cutter head 3, and the folding part 32 of the folding cutter head 3 is turned towards the center of the cutter head by pulling back the ship crane above the water surface, so that the outer diameter of the folding cutter head 3 after folding is smaller than the outer diameter of the shield inner shell 2, and preparation is made for downward rollback of tunneling equipment;

s3, installing water isolation device

As shown in fig. 3, the sealing cover 4 is lifted by a ship crane, then the sealing cover 4 is sunk, and a (multi-section) hollow pipe 5 is sequentially connected on a ball valve of the sealing cover 4 (the required length of the hollow pipe 5 is calculated in advance to be higher than the water surface), then a first steel cable 6 sequentially passes through the hollow pipe 5 and the sealing cover 4, and a diver submerges into the water again to connect the first steel cable 6 with a lifting point on the folding cutter disc 3;

the crane lowers the sealing cover 4 to the top of the shield shell 1 (the uppermost end of the hollow pipe 5 is required to be exposed out of the horizontal plane to avoid water backflow), so that a lower waterproof ring groove at the bottom end of the sealing cover 4, a sealing ring 41 and an upper waterproof ring groove at the upper end of the shield shell 1 are aligned, and then the sealing cover 4 is connected with the shield shell 1 by adopting an outer bending bolt 42 to ensure tightness between the sealing cover and the shield shell.

S4, well rollback of tunneling equipment

As shown in fig. 4 and 5, the water in the space surrounded by the water blocking device and the folding cutterhead 3 is discharged by the slag discharging pipe 7, and then the shield body housing 1 is separated from the shield body housing 2 by removing the connecting piece 21 (for example, removing the connecting bolt). The cutterhead is folded in the step S2 (the outer diameter of the folded cutterhead 3 is smaller than the outer diameter of the shield body inner shell 2 after folding), the crane slowly lowers the first steel cable 6, so that the tunneling equipment separated from the shield body outer shell 1 can realize in-well rollback until the tunneling equipment rolls back to the trolley in the main tunnel 9 at the bottom of the vertical shaft, then the first steel cable 6 is removed and recycled, the ball valve is closed, the hollow pipe 5 above the ball valve is removed, and the water-proof device is recycled after the whole construction of the drainage vertical shaft is completed, so that recycling is realized.

In summary, the heading machine system in this embodiment mainly includes: the shield body shell 2 is connected with the shield body shell 1 through a connecting piece 21, and is taken as a well retreating main body after being detached from the shield body shell 1; folding a cutter head 3, and retracting the cutter head to be within the outer diameter of the shield inner shell 2 after the shaft construction is completed, so as to prepare for equipment retraction; a driving device 33 for driving the folding cutter head 3 to rotate and cut the stratum; a pinch valve 71 for controlling the slag discharge rate; the sealing cover 4 is connected with the shield body shell 1 to realize a water-proof function; the hollow pipe 5 is connected with the ball valve above the sealing cover 4 and extends to the position above the water surface to avoid water from being poured in; the ball valve is opened in the well retraction stage of the tunneling equipment and used for penetrating the first steel cable 6, and is closed after retraction is completed and used for isolating the water body. The whole system has the following advantages:

(1) The vertical shaft platform realizes water isolation receiving: the upper part of the shield body shell 1 is provided with a waterproof ring groove, and a water isolation device is hoisted by using water transport equipment such as ships and connected with the water isolation device to form a sealed whole, so that tunneling equipment and a water layer can be isolated to achieve a water stop effect.

(2) The tunneling equipment can be retracted underwater: the center of the top of the sealing cover 4 is provided with a switchable ball valve, the ball valve can be connected with a hollow pipe 5 to the water surface, a first steel cable wire 6 passes through the hollow pipe 5 on water transportation equipment such as ships and the like, and the sealing cover 4 is connected with the folding cutterhead 3 through the ball valve, so that the whole equipment can be isolated from water after the sealing cover 4 is closed. And after drainage, the tunneling equipment is hung down, so that the tunneling equipment in the well is retracted to the main tunnel 9. The underground rollback is realized through the steel cable hoisting equipment, so that the problems of complex rollback mechanism and poor structural reliability are avoided.

The whole system aims at the problems of equipment construction water resistance and underwater rollback existing in the existing underwater shaft construction, and the shaft achieves good sealing and water-proof effects by installing the water-proof device, so that the rollback safety of tunneling equipment is ensured. By adopting the designs of the water isolation device, the steel cable line and the like, the equipment is retracted and assembled rapidly in the pit, and compared with the existing upward shield and cofferdam (protection) construction technology, the equipment has high retraction efficiency and high construction speed. The water isolation device and the shield body housing 1 can be recycled after construction is completed, so that the cost is saved, and the environment is friendly.

The foregoing is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this utility model, and are intended to be within the scope of this utility model.

Claims (10)

1. An underwater retractable entry-driving machine system, comprising:

the shield body device comprises a shield body shell (1) which is vertically arranged and is provided with two open ends, wherein the shield body shell (1) is detachably connected with a shield body shell (2) with two open ends through a connecting piece (21), a folding cutter disc (3) is arranged at the top of the shield body shell (2), and the outer diameter of the folding cutter disc (3) after being folded is smaller than the inner diameter of the shield body shell (1);

the water isolation device comprises a sealing cover (4) with a containing cavity with an opening at the bottom, a hollow pipe (5) which can be communicated with the containing cavity is detachably connected to the top of the sealing cover (4), and the sealing cover (4) can be connected with the top of the shield shell (1) in a sealing way after the folding cutterhead (3) is folded; a first steel cable wire (6) is arranged in the hollow tube (5) in a penetrating mode, the first steel cable wire (6) can be connected with the folding cutter head (3) and can drive the shield inner shell (2) and the folding cutter head (3) to move downwards after the connecting piece (21) is detached.

2. An underwater retractable entry-driving system as defined in claim 1, wherein,

an upper waterproof ring groove is formed in the top of the shield body shell (1), a lower waterproof ring groove is formed in the bottom of the sealing cover (4), the upper waterproof ring groove can be in butt joint with the lower waterproof ring groove to form a waterproof ring groove, and a sealing ring (41) is embedded in the waterproof ring groove.

3. An underwater retractable entry-driving system as defined in claim 1, wherein,

the sealing cover (4) is connected with the shield body shell (1) through an outside bending bolt (42).

4. An underwater retractable entry-driving system as defined in claim 1, wherein,

an on-off valve (43) is arranged on the top of the sealing cover (4), and the hollow pipe (5) is detachably connected with the on-off valve (43).

5. An underwater retractable entry-driving system as defined in claim 1, wherein,

the hollow tube (5) is formed by splicing a plurality of sections of tube bodies.

6. An underwater retractable entry-driving system as defined in claim 1, wherein,

a plurality of guide wheels are detachably arranged at the bottom of the shield inner shell (2).

7. An underwater retractable entry-driving system as defined in claim 1, wherein,

folding blade disc (3) include blade disc main part (31) and a plurality of folding portion (32), blade disc main part (31) with the top of shield body inner shell (2) is connected, and is a plurality of folding portion (32) are followed the circumference interval of blade disc main part (31) is arranged, and a plurality of folding portion (32) respectively through the pivot articulated in the edge of blade disc main part (31) all be equipped with the cutter on the entry face of blade disc main part (31) and a plurality of on the entry face of folding portion (32).

8. An underwater retractable entry-driving system as defined in claim 7, wherein,

when the folding cutterhead (3) is in an unfolding state, the folding cutterhead (3) can be connected with a second steel cable, and a plurality of folding parts (32) can be enabled to be overturned upwards to a position attached to a tunneling surface of the cutterhead main body (31) by taking the rotating shaft of each folding part as an axial direction by pulling back the second steel cable upwards.

9. An underwater retractable entry-driving system as defined in claim 7, wherein,

the bottom of the cutter head main body (31) is provided with a driving device (33) for driving the folding cutter head (3) to rotate.

10. An underwater retractable entry-driving system as defined in claim 7, wherein,

a soil bin (311) is formed in the cutterhead main body (31), and an opening communicated with the soil bin (311) is formed in a tunneling surface of the cutterhead main body (31); the bottom of the cutterhead main body (31) is connected with a slag discharging pipe (7), and a pinch valve (71) is arranged on the slag discharging pipe (7).