阅读说明：本技术 富水砂卵石地质条件下旋喷止水帷幕施工装置 (Construction device for jet grouting waterproof curtain under water-rich sandy gravel geological condition ) 是由 徐盛 王文 倪胜 丁宏伟 徐卫东 段声超 于 2021-07-27 设计创作，主要内容包括：本申请涉及富水砂卵石地质条件下旋喷止水帷幕施工装置,属于旋喷止水帷幕的技术领域,其包括固定架、转动安装于固定架内的丝杠以及螺纹连接于丝杠周侧的连接盘；连接盘底部转动安装有机壳；机壳内沿竖向向下贯穿设置有上渣管；上渣管底端固定有旋挖底盘,连接盘内转动安装有与丝杠螺纹连接的螺纹管；螺纹管底端与机壳顶部固定连接；上渣管外周面沿竖向滑移连接有撑盘一,撑盘一顶部固定有弹簧一,弹簧一顶端与机壳内顶面固定连接；撑盘一顶部固定有顶撑杆一；连接盘内沿自身径向滑移连接有滑移件一；滑移件一用于与螺纹管外周面插接；连接盘内设置有用于对滑移件一进行限位的限位机构。本申请具有便于控制旋挖机内的渣土容量的效果。(The application relates to a construction device for a rotary spraying water-stop curtain under a water-rich sandy pebble geological condition, which belongs to the technical field of the rotary spraying water-stop curtain and comprises a fixed frame, a lead screw rotationally arranged in the fixed frame and a connecting disc in threaded connection with the peripheral side of the lead screw; the bottom of the connecting disc is rotatably provided with a shell; an upper slag pipe penetrates through the machine shell vertically and downwards; a rotary digging chassis is fixed at the bottom end of the slag feeding pipe, and a threaded pipe in threaded connection with the lead screw is rotatably installed in the connecting disc; the bottom end of the threaded pipe is fixedly connected with the top of the shell; the outer peripheral surface of the upper slag pipe is connected with a first supporting disc in a sliding manner along the vertical direction, a first spring is fixed at the top of the first supporting disc, and the top end of the first spring is fixedly connected with the inner top surface of the machine shell; a first top supporting rod is fixed at the top of the first supporting disc; a first sliding part is connected in the connecting disc in a sliding manner along the radial direction of the connecting disc; the first sliding piece is used for being inserted with the peripheral surface of the threaded pipe; and a limiting mechanism used for limiting the first sliding part is arranged in the connecting disc. The method and the device have the effect of conveniently controlling the residue soil capacity in the rotary digging machine.)

1. The construction device for the jet grouting waterproof curtain under the water-rich sandy gravel geological condition comprises a fixed frame (1), a lead screw (12) rotatably arranged in the fixed frame (1) and a connecting disc (2) in threaded connection with the peripheral side of the lead screw (12); a shell (4) is rotatably arranged at the bottom of the connecting disc (2); an upper slag pipe (5) penetrates through the machine shell (4) vertically and downwards; go up slag pipe (5) bottom mounting and have dug chassis (45) soon, its characterized in that: a threaded pipe (3) in threaded connection with the screw rod (12) is rotatably mounted in the connecting disc (2); the bottom end of the threaded pipe (3) is fixedly connected with the top of the shell (4); the outer peripheral surface of the upper slag pipe (5) is connected with a first support disc (51) in a sliding mode along the vertical direction, a first spring (52) is fixed to the top of the first support disc (51), and the top end of the first spring (52) is fixedly connected with the inner top surface of the machine shell (4); a first top supporting rod (53) is fixed at the top of the first supporting disk (51); a first sliding piece (61) is connected in the connecting disc (2) in a sliding manner along the radial direction of the connecting disc; the first sliding piece (61) is used for being inserted with the outer peripheral surface of the threaded pipe (3); and a limiting mechanism (6) used for limiting the first sliding part (61) is arranged in the connecting disc (2).

2. The water-rich sandy gravel geological condition rotary spraying water-proof curtain construction device as claimed in claim 1, wherein: the limiting mechanism (6) comprises a second sliding part (62) which is connected with the connecting disc (2) in a sliding mode along the vertical direction; one side, close to the threaded pipe (3), of the sliding piece II (62) is provided with a through hole I (65) used for penetrating the sliding piece I (61), and the top wall of the through hole I (65) is fixedly provided with an inserting block I (66) used for being inserted into the top of the sliding piece I (61); a moving assembly for driving the second sliding part (62) to move upwards is arranged between the second sliding part (62) and the first top supporting rod (53); two groups of limiting assemblies (7) used for limiting the screw rod (12) are arranged in the threaded pipe (3).

3. The water-rich sandy gravel geological condition rotary spraying water-proof curtain construction device as claimed in claim 2, wherein: and a spring IV (64) is fixed at the top end of the sliding piece II (62), and the top end of the spring IV (64) is fixedly connected with the connecting disc (2).

4. The water-rich sandy gravel geological condition rotary spraying water-proof curtain construction device as claimed in claim 2, wherein: the moving assembly comprises a second spring (54) fixed on the bottom surface of the connecting disc (2); a second spring (54) is fixed on the bottom surface of the connecting disc (2); a second support disc (55) is fixed at the bottom end of the second spring (54); the top end of the top supporting rod I (53) is abutted against the bottom surface of the supporting disc II (55); two top supporting rods II (67) are fixed on the top surfaces of the supporting disks II (55); the top end of the second top stay bar (67) is abutted against the bottom end of the second sliding piece (62).

5. The water-rich sandy gravel geological condition rotary spraying water-proof curtain construction device as claimed in claim 2, wherein: the limiting assembly (7) comprises a first limiting piece (71) connected with the threaded pipe (3) in a sliding manner along the radial direction of the screw rod (12) and a second limiting piece (72) connected with the threaded pipe (3) in a sliding manner along the vertical direction; the opposite inner sides of the second limiting piece (72) and the first sliding piece (61) are respectively provided with an inclined plane (76); a spring five (73) is fixed on one side, away from the screw rod (12), of the limiting piece I (71), and the end, away from the limiting piece I (71), of the spring five (73) is fixedly connected with the threaded pipe (3); one end of the limiting piece I (71), which is far away from the spring five (73), is inserted into the peripheral surface of the screw rod (12); a sixth spring (74) is fixed at the top end of the second limiting piece (72), and the top end of the sixth spring (74) is fixedly connected with the threaded pipe (3); a second through hole (75) for penetrating the first limiting piece (71) is formed in one side, close to the screw rod (12), of the second limiting piece (72); and a second inserting block which is used for being inserted with the top surface of the second limiting piece (72) is fixed on the top wall of the second through hole (75).

6. The water-rich sandy gravel geological condition rotary spraying water-proof curtain construction device as claimed in claim 1, wherein: a guide rod (22) is fixed on the peripheral surface of the connecting disc (2); guide way (13) have been seted up to mount (1) one side near connection pad (2), guide bar (22) are connected through guide way (13) along vertical with mount (1) slide.

7. The water-rich sandy gravel geological condition rotary spraying water-proof curtain construction device as claimed in claim 1, wherein: and one end of the first sliding part (61), which is far away from the threaded pipe (3), is fixed with a third spring (63), and one end of the third spring (63), which is far away from the first sliding part (61), is fixedly connected with the connecting disc (2).

8. The water-rich sandy gravel geological condition rotary spraying water-proof curtain construction device as claimed in claim 1, wherein: go up slag pipe (5) internal fixation and have baffle (8), baffle (8) bottom is rotated and is installed auger (81), baffle (8) top surface is fixed with motor two (82), the output of motor two (82) runs through baffle (8) and auger (81) top fixed connection.

Technical Field

The application relates to the field of jet grouting waterproof curtains, in particular to a jet grouting waterproof curtain construction device under a water-rich sandy gravel geological condition.

Background

At present, in the construction process of the jet grouting waterproof curtain, piles need to be piled on the ground in advance, and the jet digging machine is a comprehensive drilling machine, can be used for various stratums and has the characteristics of high hole forming speed, less pollution, strong maneuverability and the like.

The chinese utility model patent that the prior art can refer to the grant bulletin number for CN211974916U, it discloses a dig quick-witted dregs soon and collect hoisting device, belongs to the technical field who digs the machine soon, including the drilling rod, the circular supporting seat of terminal surface fixedly connected with under the drilling rod, the terminal surface is provided with dregs hoist mechanism under the supporting seat, terminal surface fixedly connected with digs the mechanism soon under dregs hoist mechanism, the supporting seat up end articulates there is protection machanism, protection machanism is located the dregs hoist mechanism outside, the drilling rod lateral wall is provided with drive protection machanism pivoted actuating mechanism, the supporting seat, protection machanism and dregs hoist configuration become the sediment chamber of depositing.

With respect to the related art in the above, the inventors consider that there are the following drawbacks: the dregs generated in the excavation process of the rotary excavator can enter the rotary excavator, but the capacity of the dregs in the rotary excavator is inconvenient to observe due to the fact that the rotary excavator works underground, and the excessive dregs can be stored in the rotary excavator.

Disclosure of Invention

In order to improve the problem of easy storage excess dregs in the rotary excavating machine, the application provides a water-rich sand gravel geological condition lower rotary spraying waterproof curtain construction device.

The application provides a jet grouting water-stop curtain construction equipment adopts following technical scheme under rich water sand cobble geological conditions:

the construction device for the jet grouting waterproof curtain under the water-rich sandy gravel geological condition comprises a fixed frame, a lead screw and a connecting disc, wherein the lead screw is rotatably arranged in the fixed frame; the bottom of the connecting disc is rotatably provided with a shell; an upper slag pipe penetrates through the machine shell vertically and downwards; a rotary digging chassis is fixed at the bottom end of the upper slag pipe, and a threaded pipe in threaded connection with a lead screw is rotatably installed in the connecting disc; the bottom end of the threaded pipe is fixedly connected with the top of the shell; the outer peripheral surface of the upper slag pipe is connected with a first supporting disc in a sliding mode along the vertical direction, a first spring is fixed at the top of the first supporting disc, and the top end of the first spring is fixedly connected with the inner top surface of the machine shell; a first top supporting rod is fixed at the top of the first supporting disc; a first sliding part is connected in the connecting disc in a sliding manner along the radial direction of the connecting disc; the first sliding piece is used for being inserted with the outer peripheral surface of the threaded pipe; and a limiting mechanism used for limiting the first sliding part is arranged in the connecting disc.

By adopting the technical scheme, after the broken stone and the soil scraps enter the casing through the slag feeding pipe, when the broken stone and the soil scraps are stacked to be in contact with the first supporting disc, the broken stone and the soil scraps can upwards abut against the first supporting disc, and the first supporting disc is relieved from limiting the first sliding piece through the limiting mechanism in the moving process, so that the first sliding piece is inserted into the threaded pipe, the threaded pipe does not rotate along with the screw rod, and the casing stops rotating; meanwhile, the connecting disc is fixedly connected with the threaded pipe through a first sliding piece; in the process of connecting the threaded pipe and the screw rod in a threaded manner, broken stones and soil scraps in the machine shell can be driven to rise, so that the machine shell is separated from the pot hole. Through setting up push away a dish one, be convenient for monitor rubble and soil bits in the casing, improve the problem of the easy excessive dregs of storage of digging soon in the machine.

Optionally, the limiting mechanism comprises a second sliding part connected with the connecting disc in a sliding manner along the vertical direction; a first through hole for penetrating the first sliding piece is formed in one side, close to the threaded pipe, of the second sliding piece, and a first insertion block for being inserted into the top of the first sliding piece is fixed on the top wall of the first through hole; a moving assembly for driving the second sliding part to move upwards is arranged between the second sliding part and the first top supporting rod; and two groups of limiting assemblies used for limiting the lead screw are arranged in the threaded pipe.

By adopting the technical scheme, the sliding part is used for providing limit for the first sliding part, so that the first sliding part and the threaded pipe are in a separated state; thereby the screwed pipe which loses the limiting function rotates along with the screw rod and drives the shell to rotate. The rotating machine shell can drive a rotary digging chassis at the bottom of the machine shell to dig and chisel the bottom of the pit.

Optionally, a spring four is fixed at the top end of the sliding piece two, and the top end of the spring four is fixedly connected with the connecting disc.

Through adopting above-mentioned technical scheme, spring four provides the elasticity that resets downwards for sliding part two, and the sliding part two of being convenient for provides limiting displacement for sliding part one.

Optionally, the moving assembly comprises a second spring fixed on the bottom surface of the connecting disc; a second spring is fixed on the bottom surface of the connecting disc; a second support disc is fixed at the bottom end of the second spring; the top end of the top stay bar is abutted against the bottom surfaces of the two support discs; two top supporting rods II are fixed on the top surfaces of the supporting disks II; and the top ends of the two top support rods penetrate through the bottom surface of the connecting disc and are abutted against the bottom ends of the two sliding pieces.

By adopting the technical scheme, the first top supporting rod in a rotating state upwards supports against the second top supporting rod, so that the second top supporting rod is pushed to upwards move; the second top brace rod is convenient to upwards support and press the second sliding piece, so that the limiting effect of the two pairs of the first sliding pieces of the sliding piece is relieved.

Optionally, the limiting assembly comprises a first limiting part connected with the threaded pipe in a sliding manner along the radial direction of the screw rod and a second limiting part connected with the threaded pipe in a sliding manner along the vertical direction; the inner sides of the limiting piece II, which are opposite to the sliding piece I, are respectively provided with an inclined surface; a spring V is fixed on one side of the limiting piece I, which is far away from the screw rod, and one end of the spring V, which is far away from the limiting piece, is fixedly connected with the threaded pipe; one end of the limiting piece I, which is far away from the spring five, is inserted into the peripheral surface of the screw rod; a spring six is fixed at the top end of the limiting piece two, and the top end of the spring six is fixedly connected with the threaded pipe; one side of the limiting piece II, which is close to the screw rod, is provided with a through hole II for penetrating the limiting piece I; and a second inserting block which is used for being inserted with the top surfaces of the two limiting parts is fixed on the top wall of the second through hole.

Through adopting above-mentioned technical scheme, locating part two provides limiting displacement for locating part one, prevents locating part one and lead screw grafting to can keep threaded connection's relation between messenger's screwed pipe and the lead screw. Meanwhile, when the first sliding part is in contact with the second limiting part, the limiting effect of the two pairs of first limiting parts of the limiting parts can be relieved, and the first limiting parts are inserted into the screw rod, so that the threaded pipe rotates along with the screw rod.

Optionally, a guide rod is fixed on the outer peripheral surface of the connecting disc; the fixing frame is provided with a guide groove on one side close to the connecting disc, and the guide rod is connected with the fixing frame in a sliding mode along the vertical direction through the guide groove.

Through adopting above-mentioned technical scheme, the guide way provides the guide effect for the guide bar, reduces the possibility that the connection dish deviates from the track along vertical movement in-process.

Optionally, a spring III is fixed at one end of the first sliding piece far away from the threaded pipe, and one end of the spring III far away from the first sliding piece is fixedly connected with the connecting disc.

Through adopting above-mentioned technical scheme, spring three provides the elasticity that resets to being close to screwed pipe one side for sliding member one, and sliding member one of being convenient for is pegged graft with the screwed pipe.

Optionally, go up the slag pipe internal fixation and have the baffle, the baffle bottom is rotated and is installed the auger, the baffle top surface is fixed with motor two, the output of motor two runs through baffle and auger top fixed connection.

Through adopting above-mentioned technical scheme, through setting up the auger, be convenient for promote the rubble and the soil bits that get into in the slag-tapping pipe to be convenient for rubble and soil bits get into in the casing by the slag-tapping pipe.

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

1. after the crushed stone and the soil scraps enter the shell through the slag feeding pipe, when the crushed stone and the soil scraps are stacked to be in contact with the first supporting disc, the crushed stone and the soil scraps can upwards abut against the first supporting disc, the first supporting disc is relieved from limiting the first sliding piece through the limiting mechanism in the moving process, so that the first sliding piece is inserted into the threaded pipe, the threaded pipe does not rotate along with the screw rod, and the shell stops rotating; meanwhile, the connecting disc is fixedly connected with the threaded pipe through a first sliding piece; in the process of connecting the threaded pipe and the screw rod in a threaded manner, broken stones and soil scraps in the machine shell can be driven to rise, so that the machine shell is separated from the pot hole. By arranging the first push disc, the broken stones and soil scraps in the shell can be monitored conveniently, and the problem that excessive soil and slag are easy to store in the rotary drilling rig is solved;

2. the sliding piece is used for providing limit for the first sliding piece, so that the first sliding piece is separated from the threaded pipe; thereby the screwed pipe which loses the limiting function rotates along with the screw rod and drives the shell to rotate. The rotating machine shell can drive a rotary digging chassis at the bottom of the machine shell to dig and chisel the bottom of the pit;

3. the second limiting part provides a limiting effect for the first limiting part and prevents the first limiting part from being inserted into the screw rod, so that the threaded connection between the threaded pipe and the screw rod can be kept. Meanwhile, when the first sliding part is in contact with the second limiting part, the limiting effect of the two pairs of first limiting parts of the limiting parts can be relieved, and the first limiting parts are inserted into the screw rod, so that the threaded pipe rotates along with the screw rod.

Drawings

Fig. 1 is a schematic structural view of a construction apparatus according to an embodiment of the present application.

Fig. 2 is a sectional view of a housing according to an embodiment of the present application.

FIG. 3 is a cross-sectional view of a slag tapping pipe according to an embodiment of the present application.

Fig. 4 is an enlarged schematic view at a in fig. 2.

Fig. 5 is a cross-sectional view of a threaded pipe according to an embodiment of the present application.

Reference numerals: 1. a fixed mount; 11. a first motor; 12. a lead screw; 13. a guide groove; 2. a connecting disc; 21. a cavity; 22. a guide bar; 3. a threaded pipe; 4. a housing; 41. a strip-shaped groove; 42. a rotating door; 43. a conical table; 44. a slag inlet; 45. d, rotationally digging the chassis; 46. rotating the teeth in a rotary manner; 5. a slag feeding pipe; 51. a first supporting disc; 52. a first spring; 53. a first top brace rod; 54. a second spring; 55. a second support disc; 6. a limiting mechanism; 61. a first sliding part; 62. a second sliding part; 63. a third spring; 64. a fourth spring; 65. a first through hole; 66. inserting a first block; 67. a second top brace rod; 7. a limiting component; 71. a first limiting part; 72. a second limiting part; 73. a fifth spring; 74. a sixth spring; 75. a second through hole; 76. a bevel; 8. a partition plate; 81. a packing auger; 82. and a second motor.

Detailed Description

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

The embodiment of the application discloses jet grouting waterproof curtain construction device under water-rich sandy gravel geological conditions. Referring to fig. 1 and 2, the construction device for the jet grouting of the waterproof curtain under the water-rich sandy gravel geological condition comprises a fixing frame 1 fixed on the soil surface, a motor I11 fixed on the top of the fixing frame 1, and a screw rod 12 fixed at the bottom end of an output shaft of the motor I11 and penetrating through the top surface of the fixing frame 1. A connecting disc 2 is connected with the peripheral side of the screw rod 12 in a threaded manner, a cavity 21 is formed in the connecting disc 2, and a threaded pipe 3 in threaded connection with the screw rod 12 is rotatably installed on the connecting disc 2 through the cavity 21; after the threaded pipe 3 is subjected to the limiting action along the vertical direction, the screw rod 12 is in threaded connection with the threaded pipe 3, and the connecting disc 2 can be driven to move downwards. The bottom end of the threaded pipe 3 penetrates through the connecting disc 2 and is fixed with a machine shell 4. A guide rod 22 is oppositely fixed on the peripheral surface of the connecting disc 2; the opposite inner sides of the fixed frame 1 are respectively provided with a guide groove 13, and the guide rod 22 is connected with the fixed frame 1 in a sliding manner along the vertical direction through the guide grooves 13; the guide groove 13 is used for providing a guide function for the guide rod 22, so that the connecting disc 2 can move upwards along the vertical direction.

Referring to fig. 1 and 2, two sides of the casing 4 are respectively provided with a strip-shaped groove 41, and the casing 4 is hinged with a rotating door 42 through the strip-shaped grooves 41; the housing 4 is adapted to contain soil and debris generated during excavation, and a pivoting door 42 is provided on the housing 4 for removing soil and debris from the housing 4. The inner bottom surface of the machine shell 4 is fixed with a conical table 43, and an upper slag pipe 5 penetrates downwards along the vertical direction in the machine shell 4. A conical rotary digging chassis 45 is fixed at the bottom end of the slag feeding pipe 5; a plurality of rotary digging teeth 46 are fixed on the bottom surface of the rotary digging chassis 45; the soil in the pit is excavated in the rotation process of the rotary excavating chassis 45, and soil scraps and broken stones generated can enter the slag feeding pipe 5. The bottom end of the outer peripheral surface of the upper slag pipe 5 is provided with a slag inlet 44; the outer peripheral surface of the slag feeding pipe 5 is provided with a slag outlet in the shell 4.

Referring to fig. 2 and 3, a partition plate 8 is fixed in the slag feeding pipe 5, an auger 81 is rotatably installed at the bottom of the partition plate 8, a second motor 82 is fixed on the top surface of the partition plate 8, and the output end of the second motor 82 penetrates through the partition plate 8 and is fixedly connected with the top end of the auger 81. The second motor 82 is used for driving the packing auger 81 to rotate, and the broken stone and the soil scraps entering the upper slag pipe 5 are driven by the packing auger 81 to move upwards and enter the shell 4 through the slag outlet.

Referring to fig. 2 and 3, the outer peripheral surface of the upper slag pipe 5 is connected with a first support disc 51 in a sliding manner along the vertical direction, two first springs 52 are fixed at the top of the first support disc 51, and the top ends of the first springs 52 are fixedly connected with the inner top surface of the machine shell 4; when the soil in the machine shell 4 is accumulated to be in contact with the first supporting disc 51, the first supporting disc 51 is driven to move upwards by continuously inclining the soil into the machine shell 4. Two top supporting rods 53 are fixed at the top of the supporting disc 51. A second spring 54 is fixed on the bottom surface of the connecting disc 2; a second support disc 55 is fixed at the bottom end of the second spring 54; the top end of the top stay bar I53 penetrates through the top surface of the machine shell 4 and is abutted with the bottom surface of the support disc II 55. Two top supporting rods II 67 are fixed on the top surfaces of the supporting disks II 55; the second spring 54 is sleeved on the periphery of the second top stay bar 67; after the first support disc 51 pushes the first top support rod 53 to move upwards, the second support disc 55 can be driven to move upwards, so that the second top support rod 67 moves upwards and is connected with the bottom surface of the connecting disc 2 in an inserting mode.

Referring to fig. 2 and 4, two sets of limiting mechanisms 6 for limiting the threaded pipe 3 are arranged in the connecting disc 2. The limiting mechanism 6 comprises a first sliding part 61 connected with the connecting disc 2 in a sliding manner along the radial direction of the threaded pipe 3 and a second sliding part 62 connected with the connecting disc 2 in a sliding manner along the vertical direction; the top end of the second top stay 67 penetrates through the bottom surface of the connecting disc 2 and is abutted with the bottom end of the second sliding piece 62. A spring III 63 is fixed at one end of the first sliding member 61 far away from the threaded pipe 3, and the end of the spring III 63 far away from the first sliding member 61 is fixedly connected with the connecting disc 2. One end of the sliding piece I61, which is far away from the spring III 63, is used for being inserted with the peripheral surface of the threaded pipe 3. The top end of the second sliding piece 62 is fixed with a fourth spring 64, and the top end of the fourth spring 64 is fixedly connected with the connecting disc 2. One side of the second sliding part 62, which is close to the threaded pipe 3, is provided with a first through hole 65 for penetrating the first sliding part 61, and the top wall of the first through hole 65 is fixed with a first insertion block 66 for being inserted into the top of the first sliding part 61. The second top brace 67 moves upwards and abuts against the bottom end of the second sliding part 62, and pushes the second top brace 67 to move upwards; after the second sliding member 62 moves, the first insertion block 66 is separated from the first sliding member 61, and the first sliding member 61 is inserted into the outer peripheral surface of the threaded pipe 3 under the action of the third spring 63.

Referring to fig. 2 and 5, two sets of limiting assemblies 7 for limiting the lead screw 12 are arranged in the threaded pipe 3. The limiting assembly 7 comprises a first limiting piece 71 connected with the threaded pipe 3 in a sliding manner along the radial direction of the screw rod 12 and a second limiting piece 72 connected with the threaded pipe 3 in a sliding manner along the vertical direction; the opposite inner sides of the second limiting piece 72 and the first sliding piece 61 are respectively provided with an inclined surface 76; the outer peripheral surface of the threaded pipe 3 is provided with a slot for being inserted with the first sliding piece 61, and the first limiting piece 71 is arranged in the slot. A spring five 73 is fixed on one side of the first limiting piece 71, which is far away from the screw rod 12, and the end of the spring five 73, which is far away from the first limiting piece 71, is fixedly connected with the threaded pipe 3; one end of the first limiting piece 71, which is far away from the spring five 73, is inserted into the outer peripheral surface of the screw rod 12. The top end of the second limiting piece 72 is fixed with a sixth spring 74, and the top end of the sixth spring 74 is fixedly connected with the threaded pipe 3. A second through hole 75 for penetrating the first limiting piece 71 is formed in one side, close to the screw rod 12, of the second limiting piece 72; the top wall of the second through hole 75 is fixed with a second insertion block which is used for being inserted with the top surface of the second limiting piece 72. After the first sliding member 61 is inserted into the slot, the second limiting member 72 is pressed upward by the inclined surface 76, and the second limiting member 72 is pushed to move upward. The second moving limiting member 72 is separated from the first limiting member 71 by the second inserting block, so that the limiting effect on the first limiting member 71 is released. The first limit stop 71 is disengaged from the threaded spindle 12 by the tension of the spring five 73, so that the threaded pipe 3 no longer follows the threaded spindle 12.

The implementation principle of the jet grouting waterproof curtain construction device under the water-rich sandy gravel geological condition is as follows:

when the construction device is in an excavation state, the first motor 11 drives the screw rod 12 to rotate, at the moment, the first limiting piece 71 and the screw rod 12 are in an insertion state, and the threaded pipe 3 rotates along with the screw rod 12; and the threaded pipe 3 drives the machine shell 4 to rotate. The rotary digging chassis 45 is driven to carry out rotary digging on the bottom of the pit hole in the rotating process of the machine shell 4.

When the crushed stone and soil in the machine shell 4 are piled to be contacted with the first supporting disc 51, the first supporting disc 51 moves upwards and pushes the second supporting disc 55 to move upwards. In the upward movement process of the support disc, the second top support rod 67 is abutted against the bottom of the second sliding piece 62, so that the second sliding piece 62 moves upward, the second insertion block removes the limitation on the first sliding piece 61, and the first sliding piece 61 is inserted into the slot of the threaded pipe 3.

The first sliding member 61 is pressed against the second limiting member 72 upwards through the inclined surface 76 in the moving process, so that the second inserting block releases the limiting effect on the first limiting member 71. The first limiting piece 71 is separated from the outer peripheral surface of the screw rod 12 under the tension of the spring five 73, so that the threaded pipe 3 and the screw rod 12 are restored to the threaded connection state. During the rotation of the screw 12, the connecting disc 2 moves upwards under the guiding action of the guide rod 22, so that the machine shell 4 is taken out of the pit.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above 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.