CN215565752U - Downthehole sealing device of anchor rope under water and drill bit subassembly - Google Patents

Abstract

The application relates to a water stop device in a hole of an underwater anchor cable and a drill bit assembly, which belong to the technical field of underwater anchor cable construction, and comprise a drill rod and a sleeve, wherein the drill rod is positioned in the sleeve, one end of the drill rod, which penetrates deeply into the earth, is connected with a throwable drill bit, the throwable drill bit comprises a drill bit body, a drill bit wing plate and a mandrel, one end of the mandrel is fixedly connected with the drill rod, the other end of the mandrel is fixedly connected with the drill bit wing plate, the mandrel is tubular, the drill bit wing plate is provided with a through hole, the through hole penetrates through the drill bit wing plate to communicate the inside of the mandrel with the outside, a limiting assembly for supplying water to penetrate through the mandrel in a one-way mode and spraying out from the drill bit wing plate is arranged in the mandrel, the drill bit body ring sleeve is fixed on the outer wall of the mandrel, when the throwable drill bit is stored in the drill rod, the outer wall of the drill bit is abutted against the inner wall of the sleeve, and the drill bit wing plate can not be stored in the sleeve, the sleeve can be prevented from being blocked by medium fine sand gushed out, so as to ensure that the anchor cable is placed in place, and maintaining the effect of normal operation of the subsequent anchor cable construction process.

Description

Downthehole sealing device of anchor rope under water and drill bit subassembly

Technical Field

The application relates to the technical field of underwater anchor cable construction, in particular to an underwater anchor cable hole water stop device and a drill bit assembly.

Background

Along with the development of urban infrastructure, foundation pit engineering is deeper and deeper, and the scale is larger and larger, and the anchor rod is generally adopted as an effective supporting means in the deep foundation pit engineering.

In the foundation ditch work progress, it is abundant to the aquifer, the bottom of water level on the high side, if precipitation effect is not good, groundwater can be great to the foundation ditch influence. Usually, a continuous wall is arranged before excavation of a foundation pit to serve as a structure for intercepting water, preventing seepage, bearing and retaining water.

The method has the advantages that the supporting effect on the foundation pit is achieved through the continuous wall and the anchor cable engineering, in the anchor cable construction process, a full-casing-pipe follow-up drilling mode is adopted, medium and fine sand in the stratum is flushed out in a back flushing mode, water flushed out by a drill pipe is flushed back to a gap between the drill pipe and the casing pipe, and finally the medium and fine sand is discharged.

Aiming at the related technology, the inventor thinks that the defects that for the stratum with large sand content, the water pressure at the end part of the drill rod is large, the drill rod is taken out to be spliced and replaced after the drill rod is drilled to the designed depth, the water gushing and sand gushing phenomena can occur, and gushed medium fine sand blocks the sleeve, so that the anchor bar cannot be placed in place, and the anchor rope cannot be constructed exist.

SUMMERY OF THE UTILITY MODEL

In order to prevent that well fine sand that gushes out from blockking up the sleeve pipe, reach and guarantee that the anchor rope is laid and target in place, maintain the effect that follow-up anchor rope construction process normally goes on, this application provides downthehole watertight fittings of anchor rope and drill bit subassembly under water.

The application provides a downthehole sealing device of anchor rope adopts following technical scheme:

the utility model provides an downthehole sealing device of anchor rope under water, including drilling rod and sleeve pipe, the drilling rod is located the sheathed tube inside, the drilling rod is connected with the drill bit of can losing deeply into the earth one end, the drill bit of can losing includes the drill bit body, drill bit pterygoid lamina and dabber, dabber one end and drilling rod fixed connection, the other end and drill bit pterygoid lamina fixed connection, the dabber is the tubulose, the through-hole has been seted up on the drill bit pterygoid lamina, the through-hole runs through drill bit pterygoid lamina with the inside and external intercommunication of dabber, the dabber is provided with the one-way dabber that runs through of water supply and locates spun spacing subassembly from drill bit pterygoid lamina, the drill bit ring cover is fixed on the dabber outer wall, when can losing the drill bit and accomodating in the drilling rod, drill bit outer wall and intraductal butt of sleeve pipe inner wall and drill bit pterygoid lamina can's unable accomodating.

Through adopting above-mentioned technical scheme, carry out the construction of driling under the ground water level, adopt the mode of full sleeve pipe follow-up, when the drilling rod concatenation is carried out to needs, carry the drilling rod to the hole outward, make drill bit body outer wall and inside pipe wall butt, with the gap shutoff between drilling rod and the sleeve pipe, because spacing subassembly's existence, groundwater also can't be from through-hole department anti-gush to the dabber in, more can't anti-gush to the drilling rod in, thereby the concatenation of drilling rod has been guaranteed, the length of drilling rod has been prolonged, then carry out the drilling process, when drilling finishes, outside pull drilling rod, powerful will lose drill bit and drill rod fracture, can lose the drill bit at this moment and still break the sleeve pipe shutoff, follow-up will lose the drill bit through pressure slip casting and go out the sleeve pipe, reached and prevented the well fine sand that gushes out and blockking up the sleeve pipe, guarantee that the anchor rope is laid and target in place, maintain the effect that follow-up anchor rope construction process normally goes on.

Optionally, the sleeve pipe is close to and can loses drill bit one end and be connected with the casing bit, is provided with the connector between drilling rod and the drill bit of can losing, connector one end and drilling rod fixed connection, the other end and can lose drill bit fixed connection, when the drill bit of can losing was accomodate in to the drilling rod, connector outer wall and casing bit inner wall butt, the connector is the tubulose, and drill bit external diameter is the same with the connector external diameter.

Through adopting above-mentioned technical scheme, the connector provides fixed position for losing the drill bit, and setting up of casing bit has reduced the wearing and tearing of losing the drill bit to the casing pipe tip, has prolonged casing reuse's number of times.

Optionally, the connector comprises a first region, a second region and a third region, the first region extends into the drill rod and is in threaded connection with the inner wall of the drill rod, the diameter of the outer wall of the third region is the same as the inner diameter of a casing bit, one end of the second region is fixedly connected with the first region, and the other end of the second region is fixedly connected with the third region; a sand passing groove is formed in the outer wall of the third area, the sand passing groove is formed in the length direction of the third area, and the sand passing groove is close to one end of the drill rod to penetrate through the second area.

By adopting the technical scheme, the drill rod is pulled outwards, the second area is matched with the sand passing groove, and the length of the sand passing groove exposed outside the sleeve is changed, so that the control of the counter-surge amount of the underground water and the medium fine sand to the sleeve is realized.

Optionally, a first channel, a second channel and a third channel are formed in the mandrel, the first channel, the second channel and the third channel are sequentially communicated with and penetrate through the mandrel along the length direction of the mandrel, the inner diameter of the second channel is smaller than that of the third channel, and the limiting assembly is located in the third channel; the limiting assembly comprises a steel ball and a spring, one end of the spring is fixedly connected with the drill bit wing plate, the other end of the spring is fixedly connected with the steel ball, and the steel ball is blocked at the second passage opening when the spring is in an original length state.

By adopting the technical scheme, water flow is introduced into the drill rod during drilling, impacts the steel ball, the steel ball extrudes the spring, the second channel is opened at the moment, normal drilling is ensured, and backwashing and sand discharge are carried out; when the drilling stops, the underground water is matched with the spring to reset, so that the steel balls seal the second channel, and the blockage of fine sand in the drill rod is avoided.

Optionally, a sealing ring is fixed on the outer wall of the drill bit body in a ring sleeve manner, and the sealing ring is made of rubber.

By adopting the technical scheme, when the drill bit body is accommodated in the sleeve, the sealing ring is extruded, so that the sealing property between the drill bit body and the sleeve is enhanced.

Optionally, a sealing groove is formed in the outer wall of the drill bit body, a circle is formed in the sealing groove along the outer wall of the drill bit body, the sealing ring is sleeved and fixed in the sealing groove, and the outer diameter of the sealing ring is larger than that of the drill bit body.

Through adopting above-mentioned technical scheme, the setting of seal groove will strengthen the fixed firm effect of sealing ring, avoids the extrusion wearing and tearing sealing ring, reduces the sealing ring obscission.

Optionally, an orifice pipe is arranged outside the sleeve, the orifice pipe is embedded in the diaphragm wall, the orifice pipe is communicated with spaces on two sides of the diaphragm wall, an orifice sealing device is arranged on the orifice pipe and comprises an end pipe, a gland and a sealing ring, the orifice pipe is connected with a flange of the end pipe towards one end of the foundation pit, one end of the gland is inserted into the end pipe, the sealing ring is arranged in the end pipe, the outer wall of the sealing ring is fixedly connected with the inner wall of the end pipe, and one end of the sealing ring is abutted to the end part of the gland.

Through adopting above-mentioned technical scheme, the sleeve pipe is close to and can loses drill bit one end and seal, seals near the orifice department to the sleeve pipe through sealing device simultaneously, and both ends are all sealed. The sleeve pipe runs through the orifice pipe, the gland extrudes the sealing ring, the sealing ring seals a gap between the outer wall of the sleeve pipe and the orifice pipe, and the orifice pipe is directly pre-buried into the continuous wall, so that the phenomenon of back-surge of underground water and medium fine sand from the orifice is reduced, and the normal construction of a drilling process is facilitated.

Optionally, a boss is arranged on the inner wall of the end pipe, the boss is arranged around the inner wall of the end pipe, the boss is located at one end, away from the gland, of the end pipe, the end, away from the gland, of the sealing ring is abutted against the boss, and the boss and the gland have the same inner diameter and are not larger than the inner diameter of the sealing ring.

By adopting the technical scheme, when the gland extrudes the sealing ring, the boss plays a bearing role on the sealing ring, the stability of the position of the sealing ring is ensured, and the sealing ring is extruded and can only deform to a position close to the sleeve, so that the sealing performance between the outer wall of the sleeve and the inner wall of the orifice pipe is improved.

The application still provides an anchor rope drill bit subassembly under water, adopts following technical scheme:

an underwater anchor cable drill bit assembly includes a connector and a disposable drill bit including a bit body, a bit wing plate, and a mandrel; one end of the mandrel is inserted and embedded in the connector and fixedly connected with the connector, the other end of the mandrel is fixedly connected with the drill wing plate, the mandrel is tubular, a through hole is formed in the drill wing plate and penetrates through the drill wing plate to communicate the interior of the mandrel with the outside, a limiting assembly for enabling water flow to pass through the mandrel in a one-way mode and be ejected out of the drill wing plate is arranged in the mandrel, the drill bit body is sleeved and fixed on the outer wall of the mandrel in a sleeved mode, when the drill bit can be lost and stored in the drill rod, the outer wall of the drill bit body is abutted to the inner wall of the sleeve, and the drill wing plate cannot be stored into the sleeve; one end of the connector, which is far away from the mandrel, is detachably connected with the drill rod.

Through adopting above-mentioned technical scheme, in the drilling work progress, be connected connector and drilling rod, then can lose the drill bit and be connected with the connector, drill, spacing subassembly has guaranteed that rivers one-way run through the dabber from the blowout of drill pterygoid lamina department, thereby realize the back flush process of groundwater and well fine sand, when needs carry out the shutoff to the gap between drilling rod and the sleeve pipe, direct outside pull drilling rod can, when drilling finishes, directly pull out the drilling rod by force, can lose drill bit and connector snapping, can lose the drill bit and still plug the sleeve pipe this moment, guarantee that follow-up anchor rope anchor bar puts in place in the drilling, then rethread pressure slip casting will lose the drill bit ejecting, the existence of drill bit subassembly reaches the effect of the normal construction of the underwater drilling of being convenient for.

Optionally, a pressing plate is arranged on the drill wing plate, the pressing plate is embedded and fixed on the side wall of the drill wing plate tightly attached to the mandrel, and the through hole penetrates through the drill wing plate and simultaneously penetrates through the pressing plate.

Through adopting above-mentioned technical scheme, the existence of clamp plate has strengthened the self intensity of drill bit pterygoid lamina, has guaranteed the smooth of drilling construction and has gone on.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the drill bit can be lost to realize the plugging of the gap between the casing and the drill rod;

2. the orifice sealing device realizes the plugging of the gap between the sleeve and the orifice pipe;

3. the arrangement of the connector and the sand passing groove realizes the control of the back-flush amount of underground water in the sleeve.

Drawings

Fig. 1 is a schematic view of the overall structure of a underwater anchor cable construction device;

fig. 2 is a sectional view of the overall structure at the orifice sealing device;

FIG. 3 is a schematic view of a portion of the structure at the disposable drill bit;

FIG. 4 is a cross-sectional view of a portion of the structure at the disposable drill bit;

fig. 5 is a sectional view showing a part of the structure at the accommodation groove.

In the figure, 1, an orifice tube; 11. an orifice flange; 2. an orifice sealing device; 21. an end tube; 211. a boss; 212. a sealing pressure plate; 213. a guide sleeve; 22. a gland; 221. a positioning ring; 23. a seal ring; 3. a casing bit; 4. a drill bit can be lost; 41. a bit body; 411. a sealing groove; 412. a seal ring; 42. a drill wing plate; 421. pressing a plate; 422. a short pipe; 43. a mandrel; 431. a first channel; 432. a second channel; 433. a third channel; 434. accommodating grooves; 435. a bolt; 5. a connector; 51. a first region; 52. a second region; 53. a third region; 531. a ring groove; 532. positioning a plate; 533. a sand passing groove; 6. a limiting component; 61. a spring; 62. steel balls; 7. a drill stem; 71. a sleeve; 8. and (5) grouting a cap.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses downthehole sealing device of anchor rope and drill bit subassembly under water.

Referring to fig. 1, the underwater anchor cable hole water stopping device comprises a hole pipe 1, the hole pipe 1 is used for communicating the spaces on two sides of a continuous wall, a hole sealing device 2 is connected to the end portion of the hole pipe 1 in a connecting mode, and the hole sealing device 2 is used for sealing a gap between the outer wall of a sleeve 71 and the hole pipe 1.

Referring to fig. 1 and 2, the orifice sealing device 2 includes an end tube 21, a gland 22 and a sealing ring 23, one end of the end tube 21 close to the orifice tube 1 is fixed with a sealing pressure plate 212, the sealing pressure plate 212 is annular, the inner diameter of the sealing pressure plate 212 is smaller than that of the orifice tube 1, the inner wall of the sealing pressure plate 212 is provided with a guide sleeve 213, the guide sleeve 213 is tubular, the outer wall of the guide sleeve 213 is fixedly connected with the inner wall of the sealing pressure plate 212, and after the casing 71 is inserted into the orifice tube 1, the guide sleeve 213 plays a role in guiding and limiting the casing 71; an orifice flange 11 is fixed on the outer wall of the orifice pipe 1, the orifice flange 11 is positioned at the position of the orifice pipe 1 close to the end pipe 21, and the orifice flange 11 is connected with a sealing pressure plate 212 through a flange. Be fixed with boss 211 on the end pipe 21 inner wall, boss 211 sets up a week along end pipe 21 inner wall, gland 22 is the tubulose, gland 22 one end is inserted and is inlayed inside end pipe 21, gland 22 outer wall hugs closely end pipe 21 inner wall, be fixed with holding ring 221 on the gland 22 outer wall, holding ring 221 passes through bolted connection with end pipe 21, sealing washer 23 outer wall and end pipe 21 inner wall fixed connection, sealing washer 23 one end and boss 211 butt, the other end and gland 22 butt, sealing washer 23 thickness is not less than gland 22 thickness, gland 22, the internal diameter of boss 211 and uide bushing 213 is equal the same.

Referring to fig. 3 and 4, a casing bit 3 is fixed at one end of the casing 71, which penetrates into the stratum, the casing bit 3 is tubular, one end of the casing bit 3 penetrates into the casing 71 and is in threaded connection with the inner wall of the casing 71, and the outer diameter of the exposed part of the casing bit 3 is the same as that of the casing 71. Drill rod 7 is gone deep into stratum one end and can be dismantled and be connected with and lose drill bit 4, can lose drill bit 4 and be used for cooperating with casing bit 3, be convenient for seal casing 71 when having needs, avoid groundwater and well fine sand to kick and enter casing 71 in, cause the jam to casing 71.

Referring to fig. 4 and 5, the throwable drill bit 4 includes a bit body 41, a bit wing 42 and a mandrel 43, the bit body 41 is in a circular tube shape, a connector 5 is arranged between the bit body 41 and the drill rod 7, the connector 5 is in a tube shape, one end of the connector 5 extends into the drill rod 7 and is in threaded connection with the inner wall of the drill rod 7, the outer diameter of the exposed part of the connector 5 is gradually increased and then keeps constant for a certain distance, the outer diameter is increased to be the same as the inner diameter of the casing bit 3 and then stops, namely, the part of the connector 5 in threaded connection with the drill rod 7 is defined as a first area 51, the area of the outer diameter of the connector 5 which is the same as the inner diameter of the casing bit 3 is a third area 53, a second area 52 is arranged between the third area 53 and the first area 51, and the outer wall of the second area 52 is obliquely arranged. The connector 5 is provided with a ring groove 531 and a sand passing groove 533, the ring groove 531 and the sand passing groove 533 are both located in the third area 53, the ring groove 531 is provided with a circle along the inner wall of the connector 5, along the length direction of the connector 5, one end of the ring groove 531, which is far away from the sleeve 71, is provided with an end face, which is far away from the sleeve 71, of the connector 5, one end of the mandrel 43 is inserted and embedded in the ring groove 531, and the other end of the mandrel is located outside the connector 5; the sand passing grooves 533 are located on the outer wall of the third area 53, the sand passing grooves 533 are formed in the length direction of the drill rod 7 and close to one end of the drill rod 7, the second area 52 is formed completely, in the embodiment, three sand passing grooves 533 are formed, and the adjacent sand passing grooves 533 are formed in the circumferential outer wall of the third area 53 at equal intervals.

Referring to fig. 4 and 5, a first channel 431, a second channel 432 and a third channel 433 are formed in the mandrel 43, and the first channel 431, the second channel 432 and the third channel 433 are communicated end to penetrate the mandrel 43 along the length direction of the connector 5. The outer wall of the mandrel 43 is provided with an accommodating groove 434, the accommodating groove 434 is formed in a circle along the outer wall of the mandrel 43, one end of the mandrel 43, which is far away from the connector 5, is fixedly connected with the drill wing plate 42, and the distance between the accommodating groove 434 and the end of the connector 5 along the length direction of the connector 5 is greater than the distance between the end of the connector 5 and the drill wing plate 42, that is, the drill body 41 is sleeved on the outer wall of the mandrel 43 in a ring manner and the accommodating groove 434 is filled. The outer diameter of the bit body 41 in the outer area of the connector 5 is the same as the inner diameter of the casing bit 3, the contact part of the bit body 41 and the connector 5 is in a butt state, a sealing groove 411 is formed in the outer wall of the bit body 41, the sealing groove 411 is formed in a circle along the outer wall of the bit body 41, the sealing groove 411 is located in the exposed area of the bit body 41, a sealing ring 412 is fixedly sleeved on the bit body 41, the sealing ring 412 is sleeved in the sealing groove 411 in a sleeved mode, and the outer diameter of the sealing ring 412 is larger than the outer diameter of the bit body 41.

Referring to fig. 4 and 5, a pressing plate 421 is embedded and fixed on the side wall of the drill wing plate 42 close to the drill body 41, the pressing plate 421 is used for reinforcing the strength of the drill wing plate 42, and the pressing plate 421 is fixedly connected with the drill body 41. The spindle 43 is provided with a plug pin 435, one end of the plug pin 435 is inserted and embedded in the spindle 43, the other end of the plug pin 435 is inserted and embedded in the inner wall of the annular groove 531, and the plug pin 435 is located in the area of the first channel 431 on the spindle 43. The provision of the latch 435 enables the securing of the spindle 43 to the connector 5. The diameter of the second channel 432 is smaller than the diameters of the first channel 431 and the third channel 433, a limiting component 6 is arranged in the third channel 433 of the mandrel 43, the limiting component 6 comprises a steel ball 62 and a spring 61, a short tube 422 is arranged at a position, close to the limiting component 6, of the pressing plate 421, the diameter of the steel ball 62 is larger than the diameter of the second channel 432 and smaller than the diameter of the third channel 433, the steel ball 62 abuts against the position of the second channel 432 to plug the second channel 432, one side, away from the second channel 432, of the steel ball 62 is fixedly connected with one end of the spring 61, the other end of the spring 61 is fixedly connected with one end of the short tube 422, the short tube 422 is inserted into the third channel 433, the outer wall of the short tube 422 abuts against the inner wall of the third channel 433, and one end, away from the spring 61, of the short tube 422 is fixedly connected with the pressing plate 421. The pressing plate 421 is provided with a through hole, the through hole penetrates through the pressing plate 421 and simultaneously penetrates through the drill wing plate 42, namely the through hole, the third channel 433, the second channel 432, the first channel 431 and the drill rod 7 are communicated with each other, and the through hole, the third channel 433, the first channel 431 and the drill rod 7 are used for flushing medium fine sand during drilling. Wherein be provided with locating plate 532 in connector 5, locating plate 532 is located annular 531, locating plate 532 circumference lateral wall and annular 531 inner wall butt, and locating plate 532 is supported tightly between annular 531's cell wall and dabber 43 tip towards dabber 43, has seted up the hole on the locating plate 532 to rivers spout from drill bit pterygoid lamina 42 when not influencing drilling.

The implementation principle of the underwater anchor cable hole water stopping device and the drill bit assembly is as follows: continuous

Constructing a wall, embedding an orifice pipe 1 in the continuous wall, excavating a foundation pit, chiseling a concrete protective layer at the orifice pipe 1, welding an orifice flange 11 on the orifice pipe 1, and connecting the flange with an orifice sealing device 2; the drill rod 7 penetrates into the orifice pipe 1 to carry out drilling construction; when the drill stem 7 is replaced during drilling, the disposable drill bit 4 is pulled into the casing 71, the casing drill bit 3 is sealed by the drill bit body 41, and the drill stem 7 is not separated from the disposable drill bit 4; after drilling to the designed depth, pressurizing and pulling back or reverse impacting to separate the disposable drill bit 4 from the drill rod 7, and then sealing the casing drill bit 3 by the drill bit body 41; lifting the drill rod 7 and putting the anchor cable in; the pulling sleeve 71 is connected with the grouting cap 8 through threads, the grouting cap 8 is the grouting cap 8 commonly used in common construction, and pressure grouting is carried out; and (3) retaining the last casing pipe 71, and pulling out the casing pipe 71 when the cement paste is initially set or the cement paste is balanced with the water pressure to finish the final hole.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The utility model provides an downthehole sealing device of underwater anchor rope, includes drilling rod (7) and sleeve pipe (71), and inside drilling rod (7) were located sleeve pipe (71), its characterized in that: drill rod (7) go deep into in the soil body one end be connected with can lose drill bit (4), can lose drill bit (4) including drill bit body (41), drill bit pterygoid lamina (42) and dabber (43), dabber (43) one end and drill rod (7) fixed connection, the other end and drill bit pterygoid lamina (42) fixed connection, dabber (43) are the tubulose, the through-hole has been seted up on drill bit pterygoid lamina (42), the through-hole runs through drill bit pterygoid lamina (42) with dabber (43) inside and external intercommunication, be provided with in dabber (43) and supply water to flow one-way spacing subassembly (6) of running through dabber (43) from drill bit pterygoid lamina (42) department spun, drill bit body (41) ring cover is fixed on dabber (43) outer wall, when can lose drill bit (4) and accomodate in drill rod (7), drill bit body (41) outer wall and sleeve pipe (71) inner wall butt and drill bit pterygoid lamina (42) can's unable accomodating into sleeve (71).

2. The underwater anchor cable hole water stopping device as claimed in claim 1, wherein: casing pipe (71) are close to and can lose drill bit (4) one end and are connected with casing bit (3), be provided with connector (5) between drilling rod (7) and the drill bit (4) of can losing, connector (5) one end and drilling rod (7) fixed connection, the other end with can lose drill bit (4) fixed connection, when can losing drill bit (4) and accomodate in drilling rod (7), connector (5) outer wall and casing bit (3) inner wall butt, connector (5) are the tubulose, drill bit body (41) external diameter is the same with connector (5) external diameter.

3. The underwater anchor cable hole water stopping device as claimed in claim 2, wherein: the connector (5) consists of a first area (51), a second area (52) and a third area (53), wherein the first area (51) extends into the drill rod (7) and is in threaded connection with the inner wall of the drill rod (7), the diameter of the outer wall of the third area (53) is the same as the inner diameter of the casing drill bit (3), one end of the second area (52) is fixedly connected with the first area (51), and the other end of the second area (52) is fixedly connected with the third area (53); a sand passing groove (533) is formed in the outer wall of the third area (53), the sand passing groove (533) is formed in the length direction of the third area (53), and the sand passing groove (533) is close to one end of the drill rod (7) to enable the second area (52) to be opened completely.

4. The underwater anchor cable hole water stopping device as claimed in claim 1, wherein: a first channel (431), a second channel (432) and a third channel (433) are formed in the mandrel (43), the first channel (431), the second channel (432) and the third channel (433) are sequentially communicated along the length direction of the mandrel (43) and penetrate through the mandrel (43), the inner diameter of the second channel (432) is smaller than that of the third channel (433), and the limiting component (6) is located in the third channel (433); the limiting assembly (6) comprises a steel ball (62) and a spring (61), one end of the spring (61) is fixedly connected with the drill bit wing plate (42), the other end of the spring is fixedly connected with the steel ball (62), the spring (61) is in a primary length state, and the steel ball (62) is blocked at the opening of the second channel (432).

5. The underwater anchor cable hole water stopping device as claimed in claim 2, wherein: and a sealing ring (412) is fixed on the outer wall of the bit body (41) in a ring sleeve manner, and the sealing ring (412) is made of rubber materials.

6. The underwater anchor cable hole water stopping device as claimed in claim 5, wherein: a sealing groove (411) is formed in the outer wall of the bit body (41), a circle is formed in the sealing groove (411) along the outer wall of the bit body (41), the sealing ring (412) is sleeved in the sealing groove (411) in a sleeved mode, and the outer diameter of the sealing ring (412) is larger than that of the bit body (41).

7. The underwater anchor cable hole water stopping device as claimed in claim 1, wherein: the utility model discloses a well casing, including sleeve pipe (71), well casing (71), be provided with orifice pipe (1) outward, orifice pipe (1) is pre-buried in the diaphragm wall, orifice pipe (1) intercommunication diaphragm wall both sides space, be provided with on orifice pipe (1) drill way sealing device (2), drill way sealing device (2) are including end pipe (21), gland (22) and sealing washer (23), orifice pipe (1) are towards foundation ditch one end and end pipe (21) flange joint, gland (22) one end is inserted and is inlayed in end pipe (21), sealing washer (23) are located end pipe (21), sealing washer (23) outer wall and end pipe (21) inner wall fixed connection, sealing washer (23) one end and gland (22) tip butt.

8. The underwater anchor cable hole water stopping device as claimed in claim 7, wherein: be provided with boss (211) on end pipe (21) inner wall, boss (211) set up a week along end pipe (21) inner wall, and gland (22) one end is kept away from in boss (211) are located end pipe (21), and gland (22) one end and boss (211) butt are kept away from in sealing washer (23), and boss (211) and gland (22) internal diameter are the same and all are not greater than sealing washer (23) internal diameter.

9. An underwater anchor cable drill bit assembly, comprising: the disposable drill bit comprises a connector (5) and a disposable drill bit (4), wherein the disposable drill bit (4) comprises a drill bit body (41), a drill bit wing plate (42) and a mandrel (43); one end of a mandrel (43) is inserted into the connector (5) and fixedly connected with the connector (5), the other end of the mandrel (43) is fixedly connected with a drill bit wing plate (42), the mandrel (43) is tubular, a through hole is formed in the drill bit wing plate (42) and penetrates through the drill bit wing plate (42) to communicate the inside of the mandrel (43) with the outside, a limiting component (6) for supplying water to flow through the mandrel (43) in a one-way mode and sprayed out from the drill bit wing plate (42) is arranged in the mandrel (43), a drill bit body (41) is sleeved and fixed on the outer wall of the mandrel (43), when a lost drill bit (4) is stored into a drill rod (7), the outer wall of the drill bit body (41) is abutted against the inner wall of a sleeve (71), and the drill bit wing plate (42) cannot be stored into the sleeve (71); one end of the connector (5) far away from the mandrel (43) is detachably connected with the drill rod (7).

10. An underwater anchor line drill bit assembly as claimed in claim 9, wherein: the drill bit wing plate (42) is provided with a pressing plate (421), the pressing plate (421) is embedded and fixed on the side wall of the drill bit wing plate (42) tightly attached to the mandrel (43), and the through hole penetrates through the drill bit wing plate (42) and penetrates through the pressing plate (421).

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