CN114718036A

CN114718036A - Foundation ditch soil sampling device that building engineering detected

Info

Publication number: CN114718036A
Application number: CN202210556875.4A
Authority: CN
Inventors: 何平; 王晓龙; 翁磊; 徐斌
Original assignee: Shenzhen Xinshengyuan Construction Engineering Quality Inspection Co ltd
Current assignee: Shenzhen Xinshengyuan Construction Engineering Quality Inspection Co ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-07-08

Abstract

The invention discloses a foundation pit soil sampling device for building engineering detection, and belongs to the technical field of sampling of soil related to building engineering. A foundation pit soil sampling device that building engineering detected includes: the sampling device comprises a motor, a base, two sliding blocks, a supporting plate, a worm, a first worm wheel, a second worm wheel and a sampling tube. The utility model discloses a slide block, including base, first groove, first through-hole, slider, first screw hole and the coincidence of the hole axis of first through-hole, the up end of base is opened there are two parallel first grooves, it has first through-hole to lie in two on the base to open between the first groove, two the slider imbeds two respectively in the first groove, just the slider all with first groove sliding connection, the lower extreme of backup pad with the upper end of slider is through a plurality of pillar fixed connection, the face of backup pad is opened has first screw hole, just first screw hole with the coincidence of the hole axis of first through-hole. The soil sampling device provided by the invention can finish the soil sampling work under the drive of only one driving mechanism of the motor, thereby saving labor and time.

Description

Foundation ditch soil sampling device that building engineering detected

Technical Field

The invention belongs to the technical field of sampling of soil related to constructional engineering, and particularly relates to a foundation pit soil sampling device for constructional engineering detection.

Background

The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. Before excavation, an excavation scheme is determined according to geological and hydrological data and the conditions of buildings nearby the site, and waterproof drainage work is performed. The person who is not excavated can use the method of putting the side slope to stabilize the earth slope, and the size of the slope is determined according to the relevant construction regulations. When a deeper foundation pit and a building adjacent to the deeper foundation pit are excavated, a foundation pit wall supporting method, a concrete-sprayed wall protecting method and a large foundation pit are used, and even an underground continuous wall and a columnar column type bored pile are used for interlocking, so that an outer soil layer is prevented from collapsing; for those who have no influence on nearby buildings, the underground water level can be reduced by a well point method, and slope releasing open cut is adopted; in cold regions, natural cold freezing method can be adopted for excavation and the like.

Soil sampling refers to a method for collecting soil samples, and comprises sampling arrangement and sampling technology. The sampling of the soil sample in the cross section is performed after the cross section observation is completed. Before sampling, the section should be trimmed and cleaned, the most superficial layer of the floating soil is cut off, and then the sample is taken from the central typical part layer by layer from top to bottom according to the layers.

The foundation pit needs to be detected before excavation so as to reasonably predict surface subsidence caused by deep foundation pit engineering excavation, and therefore soil sampling is an indispensable step before excavation of the foundation pit. However, the existing foundation pit soil sampling device is difficult to extract and collect the soil with strong fluidity, and most of the soil sampling devices are manually operated in soil sampling engineering, so that the device wastes time and labor.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a foundation pit soil sampling device for building engineering detection.

The purpose of the invention can be realized by the following technical scheme:

a foundation pit soil sampling device that building engineering detected includes: the sampling device comprises a motor, a base, two sliding blocks, a supporting plate, a worm, a first worm wheel, a second worm wheel and a sampling tube. The utility model discloses a slide block, including base, first groove, first through-hole, slider, first screw hole and the coincidence of the hole axis of first through-hole, the up end of base is opened there are two parallel first grooves, it has first through-hole to lie in two on the base to open between the first groove, two the slider imbeds two respectively in the first groove, just the slider all with first groove sliding connection, the lower extreme of backup pad with the upper end of slider is through a plurality of pillar fixed connection, the face of backup pad is opened has first screw hole, just first screw hole with the coincidence of the hole axis of first through-hole.

The outer side wall of the sampling tube is provided with threads, and the sampling tube penetrates through the first threaded hole and is in threaded connection with the first threaded hole; the upper end of the sampling tube is fixedly connected with an aperture valve, and the maximum opening diameter of the aperture valve is equal to the inner diameter of the sampling tube; the outer side wall of the upper end of the sampling tube is fixedly connected with a first support, a plurality of first supports are provided with second through holes, and the axes of the second through holes are parallel to the axis of the sampling tube; the outer side wall of the sampling tube is sleeved with a rotating ring, the rotating ring is rotatably connected with the upper end of the supporting plate, and the inner annular wall of the rotating ring is not contacted with the outer side wall of the sampling tube; the edge of the upper end face of the rotating ring is fixedly connected with a plurality of fixing shafts, the fixing shafts correspond to the first supporting seats one by one, the fixing shafts respectively penetrate through the second through holes, and the fixing shafts are connected with the inner walls of the second through holes in a sliding mode in the vertical direction; the upper ends of the fixed shafts are fixedly connected with the lower end edge of the first worm wheel.

The motor is fixed at the upper end of the supporting plate and is provided with a driving wheel which is in transmission connection with the output end of the electric connector, the other end of the motor is rotatably connected with a bracket, and the rotating axis of the bracket is superposed with the axis of the driving wheel; a third through hole is formed in the other end of the support, the worm penetrates through the third through hole and is in rotating connection with the third through hole, a driven wheel is fixedly connected to the other end of the worm in a coaxial mode, and the driving wheel is in transmission connection with the driven wheel through a belt; a fourth through hole is formed in the supporting plate, a transmission shaft penetrates through the fourth through hole and is rotatably connected with the fourth through hole, and one end of the transmission shaft is fixedly connected with the second worm wheel in a coaxial mode; the worm is selectively meshed with the first worm wheel and the second worm wheel.

Furthermore, two fourth through holes are respectively formed in the side walls of the two sliding blocks, a rotating shaft penetrates through the two fourth through holes and is rotatably connected with the fourth through holes, a part of the rotating shaft, which is located between the two sliding blocks, is coaxially and fixedly connected with a second bevel gear, and the second bevel gear is meshed with the first bevel gear; two straight gears are respectively arranged at two ends of the rotating shaft, and the straight gears are fixedly connected with the rotating shaft coaxially; be equipped with two racks respectively with two the straight-teeth gear internal gearing, and two the rack all with base fixed connection, just the rack all with the line parallel is walked to the first groove.

Furthermore, two first hydraulic oil cylinders are respectively embedded at one ends, far away from the sliding blocks, in the two first grooves, the first hydraulic oil cylinders are fixedly connected with the groove bottoms of the first grooves, two first plunger rods are arranged and are respectively in transmission connection with the two first hydraulic oil cylinders, and the other ends of the two first plunger rods are respectively fixedly connected with the side walls of the two sliding blocks.

Furthermore, one end, far away from the sliding block, of the first groove connected to the upper end of the base is fixedly connected with a hydraulic central oil tank, and the other end of the first groove connected with the hydraulic oil cylinder is communicated with the hydraulic central oil tank through a first hydraulic oil pipe;

furthermore, a second support is fixedly connected to the upper end of the support plate, a first through hole is formed in the upper end of the second support, a second through hole is formed in the center of the first worm gear, the axis of the first through hole coincides with that of the second through hole, a second hydraulic cylinder penetrates through the first through hole and is fixedly connected with the first through hole, a second plunger rod penetrates through the second through hole and is in transmission connection with the second hydraulic cylinder, the outer side wall of the second plunger rod is not in contact with the inner wall of the second through hole, and the section diameter of the second plunger rod is smaller than the inner diameter of the sampling tube; and the upper end of the second hydraulic oil cylinder is communicated with the hydraulic central oil tank through a second hydraulic oil pipe.

Furthermore, the upper end of the base is located between the two first grooves and is provided with a cuboid-shaped collecting box, the collecting box is inclined relative to the horizontal plane, one end, close to the first through hole, of the collecting box is the first end, away from the first through hole, and the side wall, close to one end of the through hole, of the collecting box is provided with a plurality of meshes.

Furthermore, the side wall of the sliding block is provided with a blind hole, the end face of the straight gear is provided with a fifth through hole, and a limiting pin is arranged and inserted into the fifth through hole and the blind hole simultaneously.

Furthermore, the end surface of the base is provided with a plurality of second threaded holes, and a plurality of fixed support legs are in one-to-one corresponding threaded connection with the second threaded holes; and a plurality of truckles are installed at the lower end of the base.

The invention has the beneficial effects that:

(1) the soil sampling device provided by the invention can finish the soil collection work under the drive of only one driving mechanism of the motor, thereby saving labor and time;

(2) the invention can take and collect the extracted soil in time, does not influence the soil collection of the next place, and has high working efficiency;

(3) the invention adopts the component of the diaphragm valve, and can realize the collection of the soil with stronger fluidity.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a perspective view of another embodiment of the present invention;

FIG. 3 is a schematic view of a portion of the present invention;

FIG. 4 is a partial structural cross-sectional view of the present invention;

FIG. 5 is a hydraulic schematic of the present invention;

the parts corresponding to the reference numerals in the figures are as follows:

1. a second hydraulic oil pipe; 2. a second hydraulic cylinder; 3. a second support; 4. a support; 5. a worm; 6. a second worm gear; 7. an electric motor; 8. a drive shaft; 9. a support plate; 10. a slider; 11. a rotating shaft; 12. a first bevel gear; 13. a second bevel gear; 14. fixing the supporting legs; 15. a spacing pin; 16. a spur gear; 17. a caster wheel; 18. a rack; 19. a first plunger rod; 20. a first hydraulic cylinder; 21. a first hydraulic oil pipe; 22. a hydraulic central oil tank; 23. a collection box; 24. a sampling tube; 25. a fixed shaft; 26. a first support; 27. a drive wheel; 28. an aperture valve; 29. a first worm gear; 30. a driven wheel; 31. a second plunger rod; 32. a base; 33. mesh openings; 34. a first through hole; 35. and (6) rotating the ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship merely to facilitate description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced components or elements must be in a particular orientation, constructed and operative in a particular orientation, and are not to be construed as limiting the invention.

As shown in FIGS. 1-5, a foundation pit soil sampling device for building engineering detection comprises: the device comprises a motor 7, a base 32, two sliders 10, a support plate 9, a worm 5, a first worm wheel 29, a second worm wheel 6 and a sampling tube 24. The up end of base 32 is opened there are the first groove of two parallels, be located two on the base 32 it has first through-hole 34, two to open between the first groove slider 10 imbeds two respectively the first inslot, just slider 10 all with first groove sliding connection, the lower extreme of backup pad 9 with the upper end of slider 10 is through a plurality of pillar fixed connection, the face of backup pad 9 is opened there is first screw hole, just first screw hole with the coincidence of the hole axis of first through-hole 34.

The outer side wall of the sampling tube 24 is provided with threads, and the sampling tube 24 passes through the first threaded hole and is in threaded connection with the first threaded hole; an aperture valve 28 is fixedly connected to the upper end of the sampling tube 24, and the maximum opening diameter of the aperture valve 28 is equal to the inner diameter of the sampling tube 24; the outer side wall of the upper end of the sampling tube 24 is fixedly connected with a first support 26, a plurality of first supports 26 are provided with second through holes, and the axes of the second through holes are parallel to the axis of the sampling tube 24; a rotating ring 35 is sleeved on the outer side wall of the sampling tube 24, the rotating ring 35 is rotatably connected with the upper end of the supporting plate 9, and the inner annular wall of the rotating ring 35 is not in contact with the outer side wall of the sampling tube 24; a plurality of fixing shafts 25 are fixedly connected to the edge of the upper end surface of the rotating ring 35, the plurality of fixing shafts 25 correspond to the plurality of first supporting seats 26 one by one, the plurality of fixing shafts 25 penetrate through the second through holes respectively, and the fixing shafts 25 are connected with the inner walls of the second through holes in a sliding manner in the vertical direction; the upper ends of the fixed shafts 25 are fixedly connected with the lower end edge of the first worm wheel 29.

The motor 7 is fixed at the upper end of the supporting plate 9, a driving wheel 27 is arranged to be in transmission connection with the output end of the electric connector, the other end of the motor 7 is rotatably connected with the bracket 4, and the rotating axis of the bracket 4 is overlapped with the axis of the driving wheel 27; a third through hole is formed in the other end of the support 4, the worm 5 penetrates through the third through hole and is in rotary connection with the third through hole, a driven wheel 30 is fixedly connected to the other end of the worm 5 coaxially, and the driving wheel 27 is in transmission connection with the driven wheel 30 through a belt; a fourth through hole is formed in the supporting plate 9, a transmission shaft 8 penetrates through the fourth through hole and is rotatably connected with the fourth through hole, and one end of the transmission shaft 8 is fixedly connected with the second worm wheel 6 in a coaxial mode; the worm 5 is selectively meshed with the first worm wheel and the second worm wheel, and the rotation of the bracket 4 is manually controlled so as to selectively control the worm 5 to be meshed with the first worm wheel 29 or the second worm wheel 6.

Furthermore, two fourth through holes are respectively formed in the side walls of the two sliding blocks 10, a rotating shaft 11 penetrates through the two fourth through holes, the rotating shaft 11 is rotatably connected with the fourth through holes, a part of the rotating shaft 11, which is located between the two sliding blocks 10, is coaxially and fixedly connected with a second bevel gear 13, and the second bevel gear 13 is meshed with the first bevel gear 12; two straight gears 16 are respectively arranged at two ends of the rotating shaft 11, and the straight gears 16 are fixedly connected with the rotating shaft 11 coaxially; two racks 18 are respectively engaged with the two straight gears 16, the racks 18 are fixedly connected with the base 32, and the racks 18 are parallel to the routing of the first groove. The rotation of the first bevel gear 12 can drive the second bevel gear 13 to rotate, which drives the rotating shaft 11 to rotate, so that the spur gear 16 rotates, the spur gear 16 rolls on the rack 18, and the sliding block 10 is driven to slide in the first groove.

Furthermore, two first hydraulic oil cylinders 20 are respectively embedded at one ends, far away from the sliding blocks, in the two first grooves, the first hydraulic oil cylinders 20 are fixedly connected with the groove bottoms of the first grooves, two first plunger rods 19 are arranged and are respectively in transmission connection with the two first hydraulic oil cylinders 20, the other ends of the two first plunger rods 19 are respectively fixedly connected with the side walls of the two sliding blocks 10, and when the sliding blocks 10 slide along the first grooves, the first plunger rods 19 can be pushed into the first hydraulic cylinders.

Further, one end of the base 32, which is far away from the slider 10, between the first grooves connected to the upper end of the base 32 is fixedly connected with a hydraulic central oil tank 22, and the other ends of the hydraulic oil cylinders are all in through connection with the hydraulic central oil tank 22 through a first hydraulic oil pipe 21;

furthermore, a second support 3 is fixedly connected to the upper end of the support plate 9, a first through hole is formed in the upper end of the second support 3, a second through hole is formed in the center of the first worm wheel 29, the axis of the first through hole coincides with the axis of the second through hole, a second hydraulic cylinder 2 is arranged to penetrate through the first through hole and is fixedly connected with the first through hole, a second plunger rod 31 is arranged to penetrate through the second through hole and is in transmission connection with the second hydraulic cylinder 2, the outer side wall of the second plunger rod 31 is not in contact with the inner wall of the second through hole, and the section diameter of the second plunger rod 31 is smaller than the inner diameter of the sampling tube 24; the upper end of the second hydraulic cylinder 2 is connected with the hydraulic central oil tank 22 through a second hydraulic oil pipe 1.

Further, a rectangular collecting box 23 is arranged between the two first grooves at the upper end of the base 32, the collecting box 23 is inclined relative to the horizontal plane, one end of the collecting box 23 close to the first through hole 34 is first far away from one end of the first through hole 34, and a plurality of meshes 33 are arranged on the side wall of one end of the collecting box 23 close to the through hole. The collected soil is in the inclined bottom groove of the collection box 23 due to gravity, and the moisture in the soil is filtered out through the mesh 33 and discharged out of the device of the present invention through the first groove.

Further, the lateral wall of slider 10 is opened there is the blind hole, the terminal surface of straight-teeth gear 16 is opened there is the fifth through-hole, is equipped with spacer pin 15 and inserts simultaneously the fifth through-hole with the blind hole, in the in-process spacer pin 15 of soil sample is in insert the fifth through-hole with the state of blind hole to reach the purpose of the position locking of slider 10, when carrying out soil and collecting to the collecting box 23 in, pull out spacer pin 15 again, slider 10 just can follow first groove and slide.

Furthermore, the end face of the base 32 is provided with a plurality of second threaded holes, a plurality of fixed supporting legs 14 are in one-to-one threaded connection with the second threaded holes, and the fixed supporting legs 14 are rotated downwards before the whole process of soil sampling and soil collection, so that the device can be stably placed on the ground; and a plurality of truckles 17 are installed to the lower extreme of base 32, and after the sample of soil and the collection process were ended, the fixed landing leg 14 of top spin, truckle 17 and ground contact to increase this device's mobility, conveniently accomplish the transfer of device.

The working principle is as follows:

first, the first through hole 34 is aligned with the soil sampling point, and as shown in fig. 3, the rotation of the bracket 4 is manually controlled so that the worm 5 is engaged with the first worm wheel 29. Then checking and opening the valve port of the diaphragm valve 28 to the maximum, detecting and enabling the limiting pin 15 to be in an insertion state, then opening the motor 7, enabling the motor 7 to rotate forwards, enabling the driving wheel 27 to rotate under the transmission of the motor 7, enabling the driving wheel 27 to drive the worm 5 to rotate through belt transmission, and enabling the first worm wheel 29 meshed with the worm 5 to rotate; with the rotation of the first worm wheel 29, the plurality of fixed shafts 25 rotate around the axis of the first worm wheel 29, so as to drive the sampling tube 24 to downwards rotate relative to the support plate 9 and insert the sampling tube into soil through the first through hole 34, when the lower end of the first support 26 is about to contact with the upper end surface of the rotating ring 35, the motor 7 is closed, the aperture valve 28 is closed, the motor 7 is reopened, the motor 7 rotates reversely, and the sampling tube 24 upwards rotates according to the transmission principle, so that soil with high fluidity in the sampling tube 24 cannot fall down under the action of pressure in the process of ascending the sampling tube 24 because the upper end of the sampling tube 24 is closed by the aperture ring;

when the sampling tube 24 rises to the original state position, the motor 7 is closed again, then the support 4 is manually controlled, the worm 5 is meshed with the second worm wheel 6, the limiting pin 15 is removed, the motor 7 is opened, the motor 7 rotates forwards, the worm 5 rotates to drive the second worm wheel 6 to rotate in the same transmission mode as the transmission mode, the transmission shaft 8 fixedly connected with the second worm wheel 6 rotates to drive the first bevel gear 12 to rotate, the second bevel gear 13 rotates along with the rotation, the straight gear 16 rolls along the rack 18, the sliding block 10 slides along the first groove, and when the lower end of the sampling tube 24 just moves to the upper side of the collecting box 23, the valve port of the iris valve 28 is opened to the maximum through manual control. As shown in FIG. 5, along with the sliding of the slide block 10, the slide block 10 pushes the first plunger rod 19, the hydraulic oil in the first hydraulic oil cylinder 20 is pushed into the hydraulic central oil tank 22 and is conveyed into the second hydraulic oil cylinder 2 by the second hydraulic oil pipe 1, the hydraulic oil in the second hydraulic oil cylinder 2 pushes the second plunger rod 31 downwards, the lower end of the plunger rod gradually passes through the valve port of the iris valve 28, the soil sample in the sampling pipe 24 is pushed downwards into the collecting box 23, and because the lower end of the sampling pipe 24 is moved relative to the rectangular collecting box 23 during the pushing process, the collected soil sample is layered clearly, the influence on the later detection caused by the impurity of each soil layer is avoided, and the process of soil sampling and collecting is completed once.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides a foundation ditch soil sampling device that building engineering detected which characterized in that includes: the sampling device comprises a motor, a base, two sliding blocks, a supporting plate, a worm, a first worm wheel, a second worm wheel and a sampling tube;

the upper end surface of the base is provided with two parallel first grooves, a first through hole is formed between the two first grooves on the base, the two sliding blocks are respectively embedded into the two first grooves, the sliding blocks are both in sliding connection with the first grooves, the lower end of the supporting plate is fixedly connected with the upper end of the sliding block through a plurality of supporting columns, the plate surface of the supporting plate is provided with a first threaded hole, and the first threaded hole is overlapped with the hole axis of the first through hole;

the outer side wall of the sampling tube is provided with threads, and the sampling tube penetrates through the first threaded hole and is in threaded connection with the first threaded hole; the upper end of the sampling tube is fixedly connected with an aperture valve, and the maximum opening diameter of the aperture valve is equal to the inner diameter of the sampling tube; the outer side wall of the upper end of the sampling tube is fixedly connected with a first support, a plurality of first supports are provided with second through holes, and the axes of the second through holes are parallel to the axis of the sampling tube; the outer side wall of the sampling tube is sleeved with a rotating ring, the rotating ring is rotatably connected with the upper end of the supporting plate, and the inner annular wall of the rotating ring is not contacted with the outer side wall of the sampling tube; the edge of the upper end face of the rotating ring is fixedly connected with a plurality of fixing shafts, the fixing shafts correspond to the first supporting seats one by one, the fixing shafts respectively penetrate through the second through holes, and the fixing shafts are connected with the inner walls of the second through holes in a sliding mode in the vertical direction; the upper ends of the fixed shafts are fixedly connected with the lower end edge of the first worm wheel;

2. The foundation pit soil sampling device for building engineering detection according to claim 1, wherein two fourth through holes are respectively formed in the side walls of the two sliding blocks, a rotating shaft penetrates through the two fourth through holes, the rotating shaft is rotatably connected with the fourth through holes, a second bevel gear is coaxially and fixedly connected to a portion of the rotating shaft located between the two sliding blocks, and the second bevel gear is meshed with the first bevel gear; two straight gears are respectively arranged at two ends of the rotating shaft, and the straight gears are fixedly connected with the rotating shaft coaxially; be equipped with two racks respectively with two the straight-teeth gear internal gearing, and two the rack all with base fixed connection, just the rack all with the line parallel is walked to the first groove.

3. The foundation pit soil sampling device for building engineering detection according to claim 1, wherein two first hydraulic cylinders are respectively embedded at one end of each of the two first grooves far away from the sliding block, the first hydraulic cylinders are fixedly connected with the bottoms of the first grooves, two first plunger rods are respectively in transmission connection with the two first hydraulic cylinders, and the other ends of the two first plunger rods are respectively fixedly connected with the side walls of the two sliding blocks.

4. The foundation pit soil sampling device for building engineering detection according to claim 3, wherein one end of the base, which is far away from the slider, between the first grooves connected to the upper end of the base is fixedly connected with a hydraulic central oil tank, and the other end of the hydraulic oil cylinder is in through connection with the hydraulic central oil tank through a first hydraulic oil pipe.

5. The foundation pit soil sampling device for building engineering detection according to claim 4, wherein a second support is fixedly connected to the upper end of the support plate, a first through hole is formed in the upper end of the second support, a second through hole is formed in the center of the first worm gear, the axis of the first through hole coincides with the axis of the second through hole, a second hydraulic cylinder penetrates through the first through hole and is fixedly connected with the first through hole, a second plunger rod penetrates through the second through hole and is in transmission connection with the second hydraulic cylinder, the outer side wall of the second plunger rod is not in contact with the inner wall of the second through hole, and the cross-sectional diameter of the second plunger rod is smaller than the inner diameter of the sampling tube; and the upper end of the second hydraulic oil cylinder is in through connection with the hydraulic central oil tank through a second hydraulic oil pipe.

6. The foundation pit soil sampling device for building engineering detection according to claim 1, wherein a rectangular collection box is arranged between the two first grooves at the upper end of the base, the collection box is inclined relative to a horizontal plane, one end of the collection box close to the first through hole is first far away from the first through hole, and a plurality of meshes are arranged on the side wall of one end of the collection box close to the through hole.

7. The foundation pit soil sampling device for building engineering detection as recited in claim 1, wherein a blind hole is formed in a side wall of the slider, a fifth through hole is formed in an end surface of the spur gear, and a stopper pin is provided to be inserted into the fifth through hole and the blind hole simultaneously.

8. The foundation pit soil sampling device for building engineering detection according to claim 1, wherein a plurality of second threaded holes are formed in the end surface of the base, and a plurality of fixing support legs are in one-to-one threaded connection with the second threaded holes; and a plurality of casters are installed at the lower end of the base.