CN213267914U

CN213267914U - Double-row pile and inclined strut combined soft soil deep foundation pit supporting mechanism

Info

Publication number: CN213267914U
Application number: CN202021980393.4U
Authority: CN
Inventors: 陈立明; 谢毅; 刘婷; 陶涛
Original assignee: Shenzhen Pengcheng Geotechnical Technology Co ltd
Current assignee: Shenzhen Pengcheng Geotechnical Technology Co ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-05-25
Anticipated expiration: 2030-09-10

Abstract

The application relates to the field of deep foundation pit support, in particular to a double-row pile and inclined strut combined soft soil deep foundation pit support mechanism, which comprises a plurality of groups of double-row piles arranged in a foundation pit, wherein the double-row piles comprise front-row piles and rear-row piles, the front-row piles and the rear-row piles are arranged at intervals along the direction vertical to the soil mass of the side wall of the foundation pit, the front-row piles are close to a foundation pit operation area, the tops of every two adjacent front-row piles or rear-row piles are provided with front crown beams or rear crown beams, one group of double-row piles are provided with a connecting beam, one end of the connecting beam is fixedly connected with the front crown beams, the other end of the connecting beam is fixedly connected with the rear crown beams, the connecting beams are positioned between the corresponding front-row piles and rear-row piles, the side edge of the front crown beams, which is far away from the rear crown beams, the bottom of the extending beams is slidably connected with a plurality of baffles, the bottom of the baffle is inserted into the top of the foundation pit operation area. The application has the effect of further improving the safety.

Description

Double-row pile and inclined strut combined soft soil deep foundation pit supporting mechanism

Technical Field

The application relates to the field of deep foundation pit support, in particular to a double-row pile and inclined strut combined soft soil deep foundation pit support mechanism.

Background

At present, a deep foundation pit refers to a project with an excavation depth of more than 5 meters, or a depth of less than 5 meters, but with particularly complicated geological conditions, surrounding environment and underground pipelines. In order to ensure the safety of underground construction and the surrounding environment of the foundation pit, a supporting structure is generally required to be established on the side wall of the deep foundation pit and the surrounding environment.

The existing deep foundation pit supporting structure generally adopts a double-row pile supporting structure, the double-row pile supporting structure has larger lateral rigidity, the lateral deformation of a foundation pit can be obviously reduced, the double-row pile supporting structure is generally arranged along the side wall of the foundation pit, the double-row pile supporting structure comprises front and rear rows of supporting piles, the front and rear rows of supporting piles are connected in an enhanced mode through connecting beams, every two front supporting piles or rear supporting piles are connected in an enhanced mode through crown beams, and intervals exist between every two rows of piles.

Aiming at the related technologies, the inventor thinks that a space exists between each group of double-row piles, and when gravels or other construction objects on the outer sides of the double-row piles and at the edge of a foundation pit roll off from the space between the double-row piles and enter a working area, workers are easy to smash.

SUMMERY OF THE UTILITY MODEL

In order to further improve the security, this application provides a double row pile and bracing combination weak soil deep basal pit supporting mechanism.

The application provides a pair of double row pile and bracing combination weak soil deep basal pit supporting mechanism adopts following technical scheme:

the utility model provides a double row pile and bracing combination weak soil deep basal pit supporting mechanism, is including setting up the double row pile of a plurality of groups in the foundation ditch, the double row pile includes preceding row pile and back row pile, preceding row pile and back row pile set up along interval around the perpendicular foundation ditch lateral wall soil body direction, preceding row pile is close to the foundation ditch operation district, and two liang are adjacent preceding row pile or back row pile top are provided with preceding guan lian or back guan lian, and are a set of the double row pile is provided with one and links the roof beam, the one end fixed connection who links the roof beam is in preceding guanlian, the other end fixed connection who links the roof beam is in back guanlian lian, even the roof beam is located between corresponding preceding row pile and the back row pile, its characterized in that: the utility model discloses a foundation ditch operation area top, including the preceding roof beam of covering, the side fixedly connected with extension roof beam that the back was covered to the preceding roof beam was kept away from, extension roof beam bottom sliding connection has a plurality of baffles, one the baffle corresponds a front row pile, the baffle side is provided with the grafting subassembly that a plurality of is used for connecting adjacent baffle, the baffle bottom is inserted and is located foundation ditch operation area top.

Through adopting above-mentioned technical scheme, the staff can set up the baffle of certain quantity according to the demand, and at the regional installation baffle that has the needs, when the back row pile is outer, there is rubble etc. to roll off at the foundation ditch top, can be blockked by the baffle, alleviates its impact force, and the staff that reduces in the operation is taken place by the condition of accidental injury to this improves the security.

Optionally, the bottom of the extension beam is provided with a sliding groove penetrating through two opposite sides of the extension beam, the top of the baffle is slidably connected in the sliding groove, the plug-in component comprises a plug-in component and a receiving component, the plug-in component is arranged on one side of the baffle, the receiving component is arranged on the other opposite side of the baffle, and the plug-in component of the baffle is inserted into the receiving component of the baffle adjacent to the plug-in component.

Through adopting above-mentioned technical scheme, the staff can set up the baffle of certain quantity as required, through the cooperation of plug-in components and accepting the piece, has strengthened the joint strength between the two adjacent baffles.

Optionally, the plug-in components include an inserted bar and an inserted ball, one end of the inserted bar is fixedly connected to the side edge of the baffle, the inserted ball is fixedly connected to the other end of the inserted bar, and the inserted bar and the inserted ball are inserted into the corresponding bearing pieces.

Through adopting above-mentioned technical scheme, insert the ball tip and be the ball form, be convenient for the staff with it insert in the accepting.

Optionally, the receiving piece is including receiving the seat, the baffle side has been seted up a plurality of and has been accepted the groove, one it corresponds one and accepts the seat, one it corresponds an inserted bar to accept the seat, accept a fixed connection in the baffle side, the elastic component who accepts the seat is located accepts the inslot, there is the interval between the elastic component who accepts the seat and accept groove cell wall, the tank bottom, it has seted up the jack to accept the seat, the elastic component side of accepting the seat is provided with a plurality of deformation groove, inserted bar, inserted ball insert and establish the jack, stretch out there is the interval between the inserted ball of jack and accept groove tank bottom, the cell wall.

Through adopting above-mentioned technical scheme, inserted bar, insert the ball and get into from the jack and accept the seat in, insert the ball and strut the elastic component, wear out the back when inserting the ball from the jack, the elastic component resumes initial condition, and inserted bar, inserted ball are fixed in accepting seat department this moment, connect two liang of adjacent baffles through the method of pegging graft, convenient and fast.

Optionally, a side surface of the bearing seat close to the bottom of the bearing groove is provided with a first guide surface which is concave towards the direction close to the notch of the bearing groove, and a second guide surface matched with the first guide surface is arranged at a position of the inserted ball close to the inserted rod.

Through adopting above-mentioned technical scheme, when needing separation inserted bar and accepting the seat, draw the inserted bar towards keeping away from the bottom direction of accepting the groove, under the cooperation of first spigot surface and second spigot surface, guide, insert ball, inserted bar and accept the seat separation to this staff will be inserted bar and accept the seat separation.

Optionally, the bottom of the baffle is detachably connected with a plurality of ground inserting rods.

Through adopting above-mentioned technical scheme, the staff will insert the ground pole and insert foundation ditch operation district top, increase and insert the joint strength that the point is favorable to strengthening front row pile and foundation ditch, play the effect of strutting.

Optionally, the baffle bottom has been seted up the adjustment tank, one the adjustment tank corresponds one and inserts ground pole, the adjustment tank in-connection has the extensible member, it can dismantle to connect in the extensible member bottom to insert ground pole.

By adopting the technical scheme, when the ground inserting rod is damaged, the ground inserting rod is separated from the telescopic piece, and then a new ground inserting rod is replaced; the staff also can change the pole of inserting ground of different grade type to adapt to more demands.

Optionally, the extensible member includes loop bar and telescopic link, loop bar top fixed connection is in the adjustment tank bottom, telescopic link top sliding connection is in the loop bar, insert ground pole top and can dismantle and connect in the telescopic link bottom, the double-phase opposite side wall of adjustment tank rotates and is connected with the pivot, pivot fixedly connected with gear, telescopic link pole body is provided with vertical rack, there is the interval between rack and the loop bar inner wall, rack and gear engagement.

Through adopting above-mentioned technical scheme, rotate the pivot, the gear rotates thereupon, and the telescopic link that is connected with the rack changes correspondingly in the position of vertical direction to this staff will insert the ground pole and insert foundation ditch operation district top.

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

1. the workers can set a certain number of baffles according to requirements, the baffles are installed in the required areas, when broken stones and the like roll off outside the rear row of piles and at the top of the foundation pit, the broken stones are blocked by the baffles, the impact force of the broken stones is reduced, the accidental injury of the workers in the operation is reduced, and therefore the safety is improved;

2. when the ground inserting rod is damaged, the ground inserting rod is separated from the telescopic piece, and then a new ground inserting rod is replaced; workers can replace different types of ground inserting rods to meet more requirements;

3. the rotating shaft is rotated, the gear rotates along with the rotating shaft, and the position of the telescopic rod connected with the rack in the vertical direction is correspondingly changed, so that the ground inserting rod can be conveniently inserted into the top of the foundation pit operation area by a worker.

Drawings

Fig. 1 is a schematic structural diagram of a soft soil deep foundation pit supporting mechanism combining double-row piles and inclined struts according to an embodiment of the application.

Fig. 2 is a cross-sectional view of a double-row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism in an embodiment of the application.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a partially enlarged schematic view of a portion B in fig. 3.

Description of reference numerals: 1. double rows of piles; 11. front row piles; 12. back row piles; 13. a front crown beam; 14. a rear crown beam; 15. connecting the beams; 2. an extension beam; 21. a chute; 3. a baffle plate; 31. a slide bar; 32. a receiving groove; 33. an adjustment groove; 34. a rotating shaft; 35. a gear; 36. a rack; 4. a plug-in assembly; 41. a plug-in; 411. inserting a rod; 412. inserting a ball; 413. a second guide surface; 42. a receiving member; 421. a bearing seat; 422. a jack; 423. a first guide surface; 5. a ground inserting rod; 6. a telescoping member; 61. a loop bar; 62. a telescopic rod; 63. a clamping block; 7. a motor; 8. a diagonal brace.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses double row pile and bracing combination weak soil deep basal pit supporting mechanism. Referring to fig. 1 and 2, the double-row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism comprises a plurality of groups of double-row piles 1 arranged in a foundation pit, wherein each double-row pile 1 comprises a front row pile 11 and a rear row pile 12. Front row pile 11 and back row pile 12 set up along perpendicular foundation ditch lateral wall soil body direction back and forth interval, front row pile 11 is close to the foundation ditch operation district, 13 is guan liang before 11 tops fixedly connected with of two liang of adjacent front row piles, 14 is guan liang behind 12 tops fixedly connected with of two liang of adjacent back row piles, a set of double row pile 1 is provided with one and links roof beam 15, link roof beam 15's one end fixed connection in front and guan liang 13, link roof beam 15's other end fixed connection in back and guan liang 14, link roof beam 15 and lie in between corresponding front row pile 11 and back row pile 12. Preceding guan liang 13 keeps away from side fixedly connected with extension beam 2 of back guan liang 14, the length direction of extension beam 2 is unanimous with the length direction of preceding guanliang 13, extension beam 2 bottom sliding connection has a plurality of baffles 3, a baffle 3 corresponds a front row of

piles

11, 3 sides of baffle are provided with a plurality of plug-in components 4, connect through plug-in components 4 between two liang of

adjacent baffles

3, 3 side butt of baffle that two liang of adjacent and connect, 3 bottoms of baffle are inserted and are located foundation ditch operation district top.

Referring to fig. 1, the staff can set up the baffle 3 of certain quantity according to the demand, and at the regional installation baffle 3 that has the needs, 3 side butts of baffle of two adjacent connections, when back row pile 12 is outer, there is rubble etc. to roll at the foundation ditch top, can be blockked by baffle 3, alleviates its impact force, and the staff in the reduction operation takes place by the condition of accidental injury to this improves the security.

Referring to fig. 1 and 3, the bottom of the extension beam 2 is provided with a sliding groove 21, the sliding groove 21 penetrates through two opposite side edges of the extension beam 2, the top of the baffle 3 is fixedly connected with a sliding strip 31, the vertical section of the sliding strip 31 is T-shaped, the sliding groove 21 is matched with the sliding strip 31, and the sliding strip 31 is slidably connected in the sliding groove 21. The plug-in assembly 4 comprises a plug-in 41 and a bearing piece 42, the plug-in 41 is connected to one side edge of the baffle plate 3, the bearing piece 42 is connected to the other opposite side edge of the baffle plate 3, and the plug-in 41 of the baffle plate 3 is inserted into the bearing piece 42 of the baffle plate 3 adjacent to the plug-in 41. The staff can set up a certain amount of baffle 3 as required, through the cooperation of plug-in components 41 and bolster 42, has strengthened the joint strength between two adjacent baffle 3.

Referring to fig. 3, the insert 41 includes an insert rod 411 and an insert ball 412, one end of the insert rod 411 is fixedly connected to the side of the baffle 3, the insert ball 412 is fixedly connected to the other end of the insert rod 411, and a plurality of insert rods 411 are arranged on the side of the baffle 3 at equal intervals in the vertical direction. In this embodiment, the insertion rod 411 is a cylinder, the radius of the insertion ball 412 is larger than that of the insertion rod 411, and both the insertion rod 411 and the insertion ball 412 are inserted into the corresponding receiving member 42. The insertion area is increased by the insertion ball 412, and the end of the insertion ball 412 is spherical, so that the insertion ball can be conveniently inserted into the bearing piece 42 by a worker.

Referring to fig. 3, the receiving member 42 includes a receiving seat 421, and the receiving seat 421 includes a fixing portion and an elastic portion, and the elastic portion has elasticity and can be elastically deformed. The side of the baffle 3 is provided with a plurality of receiving grooves 32, one receiving groove 32 corresponds to one receiving seat 421, and one receiving seat 421 corresponds to one inserted rod 411. The elastic part is positioned in the bearing groove 32, the fixing part is fixedly connected to the side edge of the baffle plate 3 through a bolt, a space exists between the elastic part and the groove wall and the groove bottom of the bearing groove 32, and the side surface of the bearing seat 421 far away from the groove bottom of the bearing groove 32 is flush with the side edge of the baffle plate 3. The bearing seat 421 has an insertion hole 422, the insertion hole 422 coincides with the axis of the bearing groove 32, and the side surface of the elastic part has a plurality of deformation grooves. The insertion rod 411 and the insertion ball 412 are inserted into the insertion hole 422, the insertion ball 412 extends out of the receiving seat 421 from the insertion hole 422, and a space exists between the insertion ball 412 and the groove wall and the groove bottom of the receiving groove 32. In the initial state, the elastic portion tends to contract, the insertion rod 411 and the insertion ball 412 enter the socket 421 from the insertion hole 422, the insertion ball 412 expands the elastic portion, and after the insertion ball 412 penetrates out of the insertion hole 422, the elastic portion returns to the initial state, at this time, the insertion rod 411 and the insertion ball 412 are fixed at the socket 421, and the connection between two adjacent baffle plates 3 is completed.

Referring to fig. 3, in order to facilitate the separation of the inserting rod 411 and the receiving seat 421 by the worker, a first guiding surface 423 is disposed on a side surface of the receiving seat 421 close to the bottom of the receiving groove 32, the first guiding surface 423 is recessed toward a direction close to the notch of the receiving groove 32, the diameter of the inner ring of the insertion hole 422 close to the bottom of the receiving groove 32 is larger than that of the inserting rod 411, a second guiding surface 413 is disposed on the inserting ball 412 close to the inserting rod 411, and the second guiding surface 413 is matched with the first guiding surface 423. When the insertion rod 411 and the socket 421 need to be separated, the insertion rod 411 is pulled away from the bottom of the socket 32, and the insertion ball 412 and the insertion rod 411 are separated from the socket 421 under the engagement and guidance of the first guide surface 423 and the second guide surface 413.

Referring to fig. 4, the bottom of the baffle 3 is detachably connected with a plurality of ground inserting rods 5, and the bottoms of the ground inserting rods 5 are in a conical shape. The conical ground pole 5 of inserting in bottom is convenient for the staff to insert baffle 3 in foundation ditch operation district top, and increases and inserts the connection intensity that the point is favorable to strengthening front row pile 11 and foundation ditch, plays the effect of strutting.

Referring to fig. 4, the bottom of the baffle 3 is provided with an adjusting groove 33, one adjusting groove 33 corresponds to one ground inserting rod 5, the telescopic piece 6 is connected in the adjusting groove 33, and the ground inserting rod 5 is detachably connected to the bottom of the telescopic piece 6.

Referring to fig. 4, the extensible member 6 includes a sleeve 61 and a telescopic rod 62, the top of the sleeve 61 is fixedly connected to the bottom of the adjusting groove 33, the top of the telescopic rod 62 is fixedly connected with a clamping block 63, the clamping block 63 slides in the sleeve 61, a distance exists between the rod body of the telescopic rod 62 and the inner wall of the sleeve 61, and the bottom of the telescopic rod 62 extends out of the sleeve 61. The ground inserting rod 5 is detachably connected to the bottom of the telescopic rod 62. The two opposite groove walls of the adjusting groove 33 are rotatably connected with a rotating shaft 34, one end of the rotating shaft 34 penetrates out of the side face of the baffle 3, the outer wall of the rotating shaft 34 is sleeved with a gear 35 which is fixedly connected with the rotating shaft, a rack 36 is arranged on the rod body of the telescopic rod 62, the rack 36 is vertically arranged, a space exists between the rack 36 and the inner wall of the sleeve rod 61, and the rack 36 is meshed with the gear 35.

Referring to fig. 4, the rotation shaft 34 is rotated, the gear 35 is rotated accordingly, and the position of the extension rod 62 connected with the rack 36 in the vertical direction is changed accordingly, so that the worker can insert the ground inserting rod 5 into the top of the foundation pit operation area.

Referring to fig. 1 and 4, a driving member is fixedly connected to a side surface of the baffle 3 for rotation, in this embodiment, the driving member is a motor 7, and an output shaft of the motor 7 is connected to an end of a rotating shaft 34 through a coupling.

Referring to fig. 4, a thread groove is formed in the bottom of the telescopic rod 62, a thread section is arranged on the top of the side wall of the ground inserting rod 5, and the ground inserting rod 5 is connected to the corresponding thread groove of the telescopic rod 62 in a threaded manner. When the ground inserting rod 5 is damaged, the ground inserting rod 5 is rotated to separate the ground inserting rod 5 from the telescopic rod 62, and then a new ground inserting rod 5 is replaced; the staff can also change different types of ground pole 5 to adapt to more needs.

Referring to fig. 1, a plurality of diagonal braces 8 are fixedly connected to the side of the baffle 3 away from the front row of piles 11, and one end of each diagonal brace 8, which is far away from the baffle 3, is inserted into the top of the foundation pit operation area. The baffle 3 and the front row of piles 11 are further supported and stabilized by the inclined supporting rods 8, and stability is enhanced.

The implementation principle of the double-row pile and inclined strut combined soft soil deep foundation pit supporting mechanism in the embodiment of the application is as follows: the worker can set a certain number of baffle plates 3 according to the requirement, install the baffle plates 3 in the required area, strengthen the connection between two adjacent baffle plates 3 through the plug-in 41 and the bearing piece 42, the side edges of the two adjacent baffle plates 3 are abutted, rotate the rotating shaft 34 to adjust the position of the telescopic rod 62 in the loop bar 61, and the ground inserting rod 5 is inserted to the top of the ground operation area; when broken stones and the like roll off outside the rear row of piles 12 and at the top of the foundation pit, the broken stones and the like are blocked by the baffle 3, the impact force is reduced, the condition that workers in operation are accidentally injured is reduced, and therefore safety is improved.

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.

Claims

1. The utility model provides a double row pile and bracing combination weak soil deep basal pit supporting mechanism, is including setting up a plurality of groups double row pile (1) at the foundation ditch, double row pile (1) is including front row pile (11) and back row pile (12), front row pile (11) and back row pile (12) set up along perpendicular foundation ditch lateral wall soil body direction front and back interval, front row pile (11) are close to the foundation ditch operation district, and two liang are adjacent front row pile (11) or back row pile (12) top are provided with front crown roof beam (13) or back crown roof beam (14), and are a set of double row pile (1) is provided with one and links roof beam (15), the one end fixed connection who links roof beam (15) is in front crown roof beam (13), the other end fixed connection who links roof beam (15) is in back crown roof beam (14), link roof beam (15) to be located between corresponding front row pile (11) and back row pile (12), its characterized in that: preceding guan liang (13) keep away from side fixedly connected with extension roof beam (2) of back guanliang (14), extension roof beam (2) bottom sliding connection has a plurality of baffles (3), one baffle (3) correspond a front row stake (11), baffle (3) side is provided with plug-in components (4) that a plurality of is used for connecting adjacent baffle (3), baffle (3) bottom is inserted and is located foundation ditch operation district top.

2. The double row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism of claim 1, wherein: the novel baffle plate is characterized in that sliding grooves (21) penetrating through two opposite side edges of the extension beam (2) are formed in the bottom of the extension beam, the top of the baffle plate (3) is connected into the sliding grooves (21) in a sliding mode, the plug-in assembly (4) comprises plug-in components (41) and bearing pieces (42), the plug-in components (41) are arranged on one side edge of the baffle plate (3), the bearing pieces (42) are arranged on the other opposite side edge of the baffle plate (3), and the plug-in components (41) of the baffle plate (3) are inserted into the bearing pieces (42) of the baffle plate (3) adjacent.

3. The double row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism of claim 2, wherein: plug-in components (41) are including inserted bar (411) and insert ball (412), one of them tip fixed connection in baffle (3) side of inserted bar (411), insert ball (412) fixed connection in another tip of inserted bar (411), insert ball (412) and insert and locate in corresponding accepting member (42).

4. A double row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism according to claim 3, characterized in that: receiving piece (42) is including receiving seat (421), a plurality of is seted up to baffle (3) side and is received groove (32), one receive groove (32) and correspond one and receive seat (421), one receive seat (421) and correspond an inserted bar (411), receive seat (421) fixed connection in baffle (3) side, the elastic component of receiving seat (421) is located and receives groove (32), there is the interval between the elastic component of receiving seat (421) and receiving groove (32) cell wall, the tank bottom, socket (422) have been seted up to receiving seat (421), the elastic component side of receiving seat (421) is provided with a plurality of and changes the groove, inserted bar (411), inserted ball (412) insert and establish socket (422), stretch out there is the interval between inserted ball (412) of socket (422) and receiving groove (32) cell bottom, cell wall.

5. A double row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism according to claim 4, characterized in that: the side surface of the bearing seat (421) close to the bottom of the bearing groove (32) is provided with a first guide surface (423) which is concave towards the direction close to the notch of the bearing groove (32), and the part of the inserted ball (412) close to the inserted rod (411) is provided with a second guide surface (413) matched with the first guide surface (423).

6. The double row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism of claim 1, wherein: the bottom of the baffle (3) is detachably connected with a plurality of ground inserting rods (5).

7. A double row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism according to claim 6, characterized in that: adjustment tank (33), one have been seted up to baffle (3) bottom adjustment tank (33) correspond one and insert ground pole (5), adjustment tank (33) in-connection has extensible member (6), it can dismantle to connect in extensible member (6) bottom to insert ground pole (5).

8. A double row pile and diagonal brace combined soft soil deep foundation pit supporting mechanism according to claim 7, characterized in that: extensible member (6) include loop bar (61) and telescopic link (62), loop bar (61) top fixed connection is in adjustment tank (33) tank bottom, telescopic link (62) top sliding connection is in loop bar (61), insert ground pole (5) top and can dismantle and connect in telescopic link (62) bottom, adjustment tank (33) double-phase relative lateral wall rotates and is connected with pivot (34), pivot (34) fixedly connected with gear (35), telescopic link (62) pole body is provided with vertical rack (36), there is the interval between rack (36) and loop bar (61) inner wall, rack (36) and gear (35) meshing.