A deep foundation pit engineering survey device and survey method

Abstract

The present invention discloses a deep foundation pit engineering measurement device and a measurement method, which relates to the technical field of foundation pit engineering measurement. The deep foundation pit engineering measurement device includes a rope and a measurement main body. Among them, the measurement main body includes a housing, and the diameter of the housing is smaller than the diameter of the measurement borehole; a sleeve, the sleeve is rotatably arranged inside the housing, and the inner diameter of the sleeve is larger than the outer diameter of the rope, so that the rope can penetrate through the sleeve. Through the collaborative structure of the housing, the sleeve and the counterweight base, the compact layout of the measurement main body is realized, the risk of rubbing against the measurement borehole is reduced, and the device can be stably lowered and measured in loose soil or a borehole with obstacles. Through the design of the outer support component, different aperture requirements are adapted, and one-key deployment and recovery are realized, reducing the loading and unloading difficulty during device measurement. Through the drive of the servo motor, precise pressure control is achieved, avoiding insufficient or excessive contact pressure of the probe. Through the setting of the stabilizing component, the stability of the measurement data is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit engineering survey, and specifically relates to a deep foundation pit engineering survey device and a survey method. Background Technique

[0002] The coefficient of lateral earth pressure, as a core parameter characterizing the lateral mechanical properties of soil, directly affects the design safety and structural reliability of deep foundation pit engineering. According to engineering specifications, a deep foundation pit refers to a special foundation pit project with a excavation depth exceeding 5m, or although not reaching this standard but with complex geological conditions, dense underground pipelines and sensitive surrounding environments. With the acceleration of China's urbanization process, the phenomenon of the intersection of underground space development and existing buildings in three dimensions has become increasingly prominent. Especially for deep foundation pit projects implemented around sensitive areas such as historical building protection areas and rail transit facilities, the deformation control accuracy and environmental protection requirements have become the key restrictive factors for project implementation. From the analysis of mechanical mechanisms, the structural selection of the deep foundation pit retaining system (such as diaphragm wall, row pile support or composite soil nailing wall, etc.) directly determines the deformation response mode after excavation. When the foundation pit is adjacent to existing buildings or structures, its foundation structure type (pile foundation, raft foundation, etc.), the distribution characteristics of the additional stress at the foundation bottom, and the spatial relative position relationship between the foundation and the foundation pit will significantly change the displacement path of the retaining structure through the stress field redistribution effect. This multi-factor coupling effect makes the deformation of the retaining system show significant non-linear characteristics, and then leads to a large discreteness in the value of the coefficient of lateral earth pressure, bringing substantial challenges to the evaluation of engineering stability.

[0003] Based on a large amount of engineering measured data, the deformation modes of deep foundation pit retaining structures can be summarized into two typical forms: the flexible deformation system shows progressive displacement development, and its deformation amount is non-linearly distributed along the depth; the rigid deformation system shows overall rotation or translation characteristics, with an obvious risk of sudden instability. The difference between these two deformation modes essentially reflects the interaction mechanism between the stiffness of the retaining structure and the rheological properties of the soil, and its accurate discrimination is of decisive significance for the reasonable value of the coefficient of lateral earth pressure.

[0004] In the Chinese patent with the publication number CN116084473A, a device for measuring the coefficient of lateral earth pressure during deep foundation pit excavation and its use method are disclosed. This device realizes the real-time detection of the lateral earth pressure distribution of different retaining structures and at different depths by setting a movable wall, and the movable wall is composed of multiple movable blocks stacked on the side wall of the soil to be measured, and a lateral earth pressure sensor is set on each movable block.

[0005] In the Chinese patent with the publication number CN210766703U, a device for measuring the earth pressure of a foundation pit is disclosed. This device can realize the all-round detection of the earth pressure of the foundation pit by using the measuring device, improve the detection accuracy, and at the same time can be reused, with simple operation and low cost.

[0006] Traditional contact side earth pressure measurement devices have significant limitations in practical applications: Firstly, to avoid contact instability problems caused by water flow disturbance, hole wall friction, and probe swing, a rigid casing structure is required to forcibly transport the detection unit to the target depth, which greatly increases the equipment installation complexity in the narrow space of deep foundation pits. Secondly, limited by the single-point single-measurement mode, such devices cannot achieve continuous stratified monitoring at different depths within the same borehole. Instead, discrete data need to be obtained by repeatedly lowering the probe, which not only leads to low efficiency but also may change the original soil state of the borehole due to multiple mechanical disturbances, resulting in a decrease in data credibility. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention provides a deep foundation pit engineering measurement device and a measurement method, which solve the problems raised in the background art.

[0008] On the one hand, to achieve the above objectives, the present invention is realized through the following technical solutions: A deep foundation pit engineering measurement device includes a rope and a measurement main body. Among them, the measurement main body includes a housing, the diameter of the housing is smaller than the diameter of the measurement borehole; a casing, the casing is rotatably arranged inside the housing, and the inner diameter of the casing is larger than the outer diameter of the rope, so that the rope can penetrate through the casing; a bottom plate, the bottom plates are distributed on the periphery of the housing, and a measurement probe is provided on the side of the bottom plate away from the housing; an outer support assembly, the outer support assembly is arranged on the housing and is used to drive the bottom plate to move radially along the housing, so that the measurement probe contacts or does not contact the inner wall of the measurement borehole, and the outer support assembly is driven by a servo motor.

[0009] Furthermore, it further includes a stability assembly, the stability assembly is arranged on the periphery of the housing and is used to increase the resistance when the housing rotates around the rope; a counterweight base, the counterweight base is installed at the lower end of the housing and is used to increase the self-gravity of the measurement main body so that it can stably fall in the measurement borehole.

[0010] Furthermore, the stability assembly includes a support plate, the support plate is arranged outside adjacent two outer support assemblies, and the support plate can move radially along the housing; a traveling wheel, the traveling wheel is arranged on the support plate, and an arc-shaped notch is provided on the surface of the traveling wheel to increase the lateral resistance of the traveling wheel by the inner wall of the measurement borehole; a first guide rod, the first guide rod is fixed on the outside of the housing, and first sliding seats are symmetrically slidably installed on the first guide rod; a connecting arm, the connecting arm is arranged between the corresponding first sliding seat and the support plate, and both ends of the connecting arm are hinged to the support plate and the first sliding seat respectively; two first springs in total, and the first springs are located between one end of the first guide rod and the corresponding first sliding seat.

[0011] Further, it further includes a protection component, which is used to block falling objects in the measurement borehole when the measurement probe is in use. The protection component includes a support rod, the support rod is hinged to the upper end of the housing, the support rod is located above the measurement probe, and the number of support rods is the same as that of the measurement probes; a rigid protective cover, the rigid protective cover is installed on the support rod, and a flexible protective cover is fixed to one end of the rigid protective cover away from the housing. Both the rigid protective cover and the flexible protective cover are arc-shaped structures.

[0012] Further, it further includes a lifting component, which is arranged inside the housing and is used to drive the support rod to move. The lifting component includes a side bracket, the side bracket is arranged at one end of the support rod, and the included angle between the side bracket and the support rod is an obtuse angle; a lifting platform, the lifting platform is arranged outside the sleeve, and the lifting platform slides along the axial direction of the housing. A top rod is fixed on the lifting platform, the upper end of the top rod is hinged with a second sliding seat, and a sliding rail connected to the second sliding seat is arranged inside the side bracket; a spiral track, the spiral track is arranged outside the sleeve, and a spiral groove adapted to the spiral track is opened inside the lifting platform. The sleeve rotates to drive the lifting platform to lift through the spiral groove by the spiral track.

[0013] Further, the servo motor is fixed at a position close to the lower end inside the housing, and a driving gear is installed at the output end of the servo motor. A first toothed ring is fixedly sleeved outside the sleeve, and the driving gear meshes with the first toothed ring.

[0014] Further, the outer support component includes a cam, the cam is fixedly sleeved on the outer side of the lower end of the sleeve, and the number of convex surfaces on the cam is the same as the number of measurement probes; a push rod, one end of the push rod is fixedly connected to the pressing plate, and the other end of the push rod extends to the housing; a slider, a chute is arranged at the inner bottom of the counterweight base, and the slider is slidably installed in the chute. The push rod is fixedly connected to the slider, and one end of the push rod penetrates through the slider and is installed with a ball that abuts against the side surface of the cam; a second spring, the second spring is arranged outside the push rod and is located between the inner wall of the counterweight base and the slider.

[0015] Further, the outer support component includes a notch, the notch is arranged at the lower end inside the counterweight base, and the number of notches is the same as the number of measurement probes; a rotating shaft, the rotating shaft is rotatably installed in the notch, and one end of the rotating shaft penetrates through the inner wall of the notch and extends to the inside of the counterweight base; a movable frame, the movable frame is fixed on the outer side of the rotating shaft, and the movable frame is in an "L" shape. A through groove is arranged on the movable frame, and the other end of the movable frame is hinged to the pressing plate; a stabilizing rod, the stabilizing rod is movably arranged in the through groove, one end of the stabilizing rod is hinged to a third sliding seat that slides on the outer wall of the housing, and the other end of the stabilizing rod is hinged to a fourth sliding seat that slides on the inner side of the pressing plate; a transmission structure, the transmission structure is arranged inside the counterweight base and is used to transmit the power of the sleeve to the rotating shaft.

[0016] On the other hand, to achieve the above objectives, the present invention also provides another technical solution: a deep foundation pit engineering measurement device, including a measurement main body. There are at least two measurement main bodies, and the two measurement main bodies are arranged on different segments of a rope. Different measurement main bodies detect the soil pressure at different depths of a measurement borehole.

[0017] In addition, the present invention also provides a deep foundation pit engineering measurement method, based on the above-mentioned deep foundation pit engineering measurement device, including the following steps:

[0018] Step 1: Obtain a measurement borehole by drilling holes around the foundation pit through a drill.

[0019] Step 2: Use a rope to lower the measurement main body to a specified depth in the measurement borehole.

[0020] Step 3: Drive the servo motor to make the outer support assembly work until the measurement probe and the inner wall of the measurement borehole are pressed against each other and reach a specified pressure.

[0021] Step 4: Obtain the pressure of the inner wall of the measurement borehole on the measurement probe at different time periods through the measurement probe, and obtain the change of the foundation pit soil pressure.

[0022] The present invention has the following beneficial effects:

[0023] (1) For this deep foundation pit engineering measurement device, through the collaborative structure of the outer shell, the casing and the counterweight base, a compact layout of the measurement main body is realized, the risk of rubbing against the measurement borehole is reduced, and it is ensured that the device can be stably lowered and measured in loose soil or a borehole with obstacles. Through the design of the outer support assembly, different aperture requirements are adapted, one-key expansion and recovery are realized, and the loading and unloading difficulty during device measurement is reduced. Through the drive of the servo motor, precise pressure control is achieved, avoiding insufficient or excessive contact pressure of the probe. Through the setting of the stabilizing assembly, the rotation and shaking of the device are significantly suppressed, ensuring the stability of measurement data.

[0024] (2) For this deep foundation pit engineering measurement device, the lifting assembly is linked with the ejector rod through a spiral track to drive the automatic expansion of the rigid protective cover and the flexible protective cover. At the same time, the outer support assembly acts synchronously, realizing the integrated operation of the probe measurement and protection functions. The rigid protective cover and the flexible protective cover of the protection assembly adopt an arc-shaped diversion design, which fits the hole wall after expansion, effectively resists the impact of falling objects, and the flexible deformation adapts to different apertures.

[0025] (3) For this deep foundation pit engineering measurement device, by connecting multiple measurement main bodies in series on different segments of the rope, multi-depth soil pressure data can be obtained in a single lowering, eliminating the disturbance of the borehole state caused by repeated operations, and improving the continuity and credibility of the data.

[0026] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the first embodiment of the first invention;

[0028] Figure 2 It is a schematic structural diagram of the series connection of the measurement main bodies in the second invention;

[0029] Figure 3 It is a schematic diagram of a partial structure in the first embodiment of the first invention;

[0030] Figure 4 It is a schematic diagram of the internal structure of the housing in the first embodiment of the first invention;

[0031] Figure 5 For the first embodiment of the first invention Figure 4 front view;

[0032] Figure 6 It is a schematic diagram of the internal structure of the base in the first embodiment of the first invention;

[0033] Figure 7 It is a schematic diagram of the structure when the support rod is unfolded in the first embodiment of the first invention;

[0034] Figure 8 It is a schematic diagram of the internal structure of the housing when the support rod is unfolded in the first embodiment of the first invention;

[0035] Figure 9 For the first embodiment of the first invention Figure 8 front view;

[0036] Figure 10 It is a schematic diagram of the installation structure of the cam in the first embodiment of the first invention;

[0037] Figure 11 It is a schematic diagram of the structure of the stability component in the first invention;

[0038] Figure 12 It is a schematic diagram of the structure of the housing in the second embodiment of the first invention;

[0039] Figure 13 It is a schematic diagram of the internal structure of the housing in the second embodiment of the first invention;

[0040] Figure 14 It is a schematic diagram of the installation structure of the movable frame in the second embodiment of the first invention;

[0041] Figure 15 It is a schematic diagram of the transmission structure of the second toothed ring in the second embodiment of the first invention;

[0042] Figure 16 It is a schematic diagram of the structure when the movable frame rotates in the second embodiment of the first invention.

[0043] In the figure, 1 is a moving vehicle body; 2 is a support frame; 3 is a wire winder; 4 is a rope; 5 is a housing; 6 is a counterweight base; 7 is a stabilizing assembly; 71 is a first guide rod; 72 is a first sliding seat; 73 is a first spring; 74 is a connecting arm; 75 is a support plate; 76 is a traveling wheel; 8 is a sleeve; 9 is a support rod; 10 is a rigid protective cover; 11 is a flexible protective cover; 12 is a measuring probe; 13 is a side support; 14 is a push rod; 15 is a second sliding seat; 16 is a spiral track; 17 is a lifting platform; 18 is a spiral groove; 19 is a push rod; 20 is a slider; 21 is a chute; 22 is a second spring; 23 is a cam; 24 is an insertion cavity; 25 is a second guide rod; 26 is a third spring; 27 is a servo motor; 28 is a driving gear; 29 is a first toothed ring; 30 is a pressing plate; 31 is a movable frame; 32 is a rotating shaft; 33 is a first bevel gear; 34 is a second bevel gear; 35 is a first spur gear; 36 is a second spur gear; 37 is a second toothed ring; 38 is a stabilizing rod; 39 is a third sliding seat; 40 is a fourth sliding seat; 100 is a measuring main body. Detailed implementation mode

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0046] Next, refer to Figures 1 - 16 to describe a deep foundation pit engineering measurement device and measurement method provided by the present invention.

[0047] First invention, the present invention provides a deep foundation pit engineering measurement device.

[0048] Embodiment 1:

[0049] Please refer to Figures 1 - 11 , the embodiments of the present invention provide a technical solution:

[0050] As Figures 1 - 5As shown in the figure, a deep foundation pit engineering measurement device includes a rope 4 and a measurement main body 100. Among them, the measurement main body 100 includes a housing 5. The diameter of the housing 5 is smaller than the diameter of the measurement borehole, reducing the rubbing between the measurement main body 100 and the measurement borehole, and enabling the measurement main body 100 to smoothly fall into the measurement borehole, preparing for the measurement of deep foundation pit engineering. Inside the housing 5, a sleeve 8 is rotatably connected. Preferably, a waterproof gasket is provided at the connection between the sleeve 8 and the housing 5 to reduce the entry of sediment inside the measurement borehole into the interior of the measurement main body 100 and reduce the influence of sediment on the use of the measurement main body 100. It should be noted that the inner diameter of the sleeve 8 is larger than the outer diameter of the rope 4, enabling the rope 4 to pass through the sleeve 8. In this solution, the position of the sleeve 8 along the rope 4 can be restricted by tying knots or other means at the lower end of the rope 4 passing through the sleeve 8 to ensure the position of the sleeve 8 on the rope 4.

[0051] The measurement main body 100 provided in this embodiment further includes a bottom plate 30. The bottom plates 30 are distributed on the peripheral side of the housing 5, and a measurement probe 12 is provided on the side of the bottom plate 30 away from the housing 5. Preferably, the measurement probe 12 is a pressure sensor, mainly used to detect the pressure condition of the inner wall of the measurement borehole, thereby realizing the evaluation of the lateral earth pressure coefficient.

[0052] To ensure that the measurement probe 12 can contact the inner wall of the measurement borehole to achieve the accuracy of the evaluation of the lateral earth pressure coefficient, the measurement main body 100 provided in this embodiment further includes an outer support assembly. The outer support assembly is provided on the housing 5 and is used to drive the bottom plate 30 to move radially along the housing 5, so that the measurement probe 12 contacts or does not contact the inner wall of the measurement borehole. When the measurement probe 12 contacts the inner wall of the measurement borehole, the measurement of the lateral earth pressure can be realized. When the measurement probe 12 does not contact the inner wall of the measurement borehole, at this time, the measurement main body 100 does not contact the inner wall of the measurement borehole, so that the adjustment of the depth of the measurement main body 100 in the measurement borehole can be realized. In addition, the outer support assembly is driven by a servo motor 27. Preferably, a storage battery is also installed inside the housing 5. The storage battery supplies power to the measurement probe 12 and the servo motor 27. After the measurement probe 12 obtains measurement data, the data can be transmitted to the terminal by wireless signal. The terminal feeds back the signal to the servo motor 27 by wireless signal to control the working state of the servo motor 27. This is the prior art.

[0053] During the actual use process, to facilitate the release and recovery of the measurement main body 100, the deep foundation pit engineering measurement device provided in this embodiment further includes a mobile vehicle body 1. A support frame 2 is fixed on the mobile vehicle body 1, and a wire reel 3 is slidably installed on the support frame 2. Through the sliding connection between the support frame 2 and the wire reel 3, the fine adjustment of the position of the wire reel 3 can be realized. The wire reel 3 is used for the retraction and release of the rope 4, so as to adjust the lowering depth of the measurement main body 100. Preferably, unit length markings are provided on the rope 4 for measuring the lowering length of the rope 4.

[0054] Such as Figure 3, Figure 7 and Figure 11 As shown in Figure 7 and Figure 11 , the measuring body 100 provided in this embodiment further includes a stabilizing assembly 7. The stabilizing assembly 7 is arranged on the peripheral side of the housing 5 and is used to increase the resistance when the housing 5 rotates around the rope 4, so as to increase the anti-rotation design and make the measurement data not easily disturbed by the shaking of the device itself.

[0055] To prevent the measuring body 100 from being affected by water flow, friction with the wall of the measurement borehole, or swinging of the rope 4 during the lowering process, resulting in the tilting and rotation of the measuring body 100, and causing the measuring probe 12 to be in unstable contact with the wall of the measurement borehole, the measuring body 100 provided in this embodiment further includes a counterweight base 6. The counterweight base 6 is installed at the lower end of the housing 5 and is used to increase the self-gravity of the measuring body 100 and resist the buoyancy or mud resistance in the measurement borehole, so that the falling speed of the measuring body 100 is more stable.

[0056] As Figure 3 and Figure 11 shown, specifically, the stabilizing assembly 7 provided in this embodiment includes a support plate 75. The support plate 75 is arranged outside two adjacent outer support assemblies to prevent interference with the outer support assemblies. The support plate 75 is movable along the radial direction of the housing 5. A walking wheel 76 is provided on the support plate 75, and an arc-shaped notch is provided on the surface of the walking wheel 76, so that the lateral resistance of the walking wheel 76 against the inner wall of the measurement borehole is increased, thereby preventing the housing 5 from rotating.

[0057] However, since the inner wall of the measurement borehole is made of soil material, relying only on the grooves on the walking wheel 76 is not enough to maintain the stability of the housing 5 in the measurement borehole. Therefore, the stabilizing assembly 7 provided in this embodiment further includes a first guide rod 71. The first guide rod 71 is fixed to the outside of the housing 5, and first sliding seats 72 are symmetrically and slidably installed on the first guide rod 71. A connecting arm 74 is provided between the corresponding first sliding seats 72 and the support plate 75, and both ends of the connecting arm 74 are hinged to the support plate 75 and the first sliding seat 72 respectively. A first spring 73 is provided between one end of the first guide rod 71 and the corresponding first sliding seat 72. There are two first springs 73 in total. The first spring 73 is used to make the first sliding seats 72 approach each other, thereby changing the included angle between the connecting arm 74 and the horizontal plane, further adjusting the distance between the support plate 75 and the first guide rod 71, so that the walking wheel 76 contacts the inner wall of the measurement borehole to meet the use requirements of measurement boreholes with different inner diameters. During this process, due to the thrust of the connecting arm 74 on the support plate 75, the lateral resistance of the walking wheel 76 against the inner wall of the measurement borehole is increased, so as to prevent the housing 5 from rotating and improve the stability of the measuring body 100 during use.

[0058] As Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 andFigure 10 As shown in the figure, to reduce the influence of falling objects in the measurement borehole on the measurement results, the measurement main body 100 provided in this embodiment further includes a protection component. The protection component is used to block the falling objects in the measurement borehole when the measurement probe 12 is in use. The protection component includes a support rod 9. The support rod 9 is hinged to the upper end of the outer shell 5. The support rod 9 is located above the measurement probe 12, and the number of support rods 9 is the same as that of the measurement probes 12. A rigid protection cover 10 is installed on the support rod 9, and a flexible protection cover 11 is fixed to the end of the rigid protection cover 10 away from the outer shell 5. Both the rigid protection cover 10 and the flexible protection cover 11 are arc-shaped structures. The arc-shaped structure can guide the falling objects to fall from both sides of the measurement probe 12 to avoid the falling objects impacting the measurement probe 12 and improve the stability of the measurement probe 12 during use. Through the setting of the flexible protection cover 11, after it is unfolded, it can abut against the inner wall of the measurement borehole and deform, so as to prevent the overall outer diameter of the protection component from being larger than the inner diameter of the measurement borehole and causing the protection performance to decline.

[0059] As Figure 4 , Figure 5 , Figure 8 and Figure 9 As shown in the figure, to realize the unfolding of the protection component, the measurement main body 100 provided in this embodiment further includes a lifting component. The lifting component is arranged inside the outer shell 5 and is used to drive the support rod 9 to move. Specifically, the lifting component includes a side bracket 13, a lifting platform 17 and a spiral track 16. The side bracket 13 is arranged at one end of the support rod 9, the lifting platform 17 is arranged outside the sleeve 8, and the lifting platform 17 slides along the axial direction of the outer shell 5. Preferably, a groove is provided at the edge of the lifting platform 17, and a linear slideway connected to the groove is provided on the inner wall of the outer shell 5 to keep the lifting platform 17 sliding inside the outer shell 5. In addition, a top rod 14 is fixed on the lifting platform 17, the upper end of the top rod 14 is hinged with a second sliding seat 15, and a slide rail connected to the second sliding seat 15 is arranged inside the side bracket 13. Through the sliding connection between the slide rail and the second sliding seat 15, the displacement after the movement of the side bracket 13 is compensated, and the stability of the connection between the top rod 14 and the side bracket 13 is improved. Preferably, the side bracket 13 and the support rod 9 are integrally cast, and the included angle between the side bracket 13 and the support rod 9 is an obtuse angle to ensure that there is still a certain included angle between the side bracket 13 and the top rod 14 after the support rod 9 rotates 90°, so that the top rod 14 applies a more stable thrust to the side bracket 13. The spiral track 16 is arranged outside the sleeve 8, and a spiral groove 18 adapted to the spiral track 16 is opened in the lifting platform 17. The sleeve 8 rotates to drive the lifting platform 17 to lift through the spiral track 16 passing through the spiral groove 18. Preferably, balls are arranged inside the spiral groove 18 to reduce the torsion between the spiral track 16 and the spiral groove 18 and improve the matching effect between the spiral track 16 and the spiral groove 18.

[0060] As Figure 4 and Figure 9As shown, the servo motor 27 provided in this embodiment is fixed at a position near the lower end inside the housing 5, and a driving gear 28 is installed at the output end of the servo motor 27. A first toothed ring 29 is fixedly sleeved outside the sleeve 8, and the driving gear 28 meshes with the first toothed ring 29, so that the sleeve 8 rotates along with the first toothed ring 29.

[0061] As Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, the outer support assembly provided in this embodiment includes a cam 23. The cam 23 is fixedly sleeved on the outer lower end of the sleeve 8, and the number of convex surfaces on the cam 23 is the same as the number of measuring probes 12. It also includes a push rod 19. One end of the push rod 19 is fixedly connected to the abutting plate 30, and the other end of the push rod 19 extends to the housing 5. Among them, a sliding groove 21 is provided at the inner bottom of the counterweight base 6, and a slider 20 is slidably installed in the sliding groove 21. The push rod 19 is fixedly connected to the slider 20, and one end of the push rod 19 penetrates through the slider 20 and is installed with a ball that abuts against the side surface of the cam 23. A second spring 22 is installed outside the push rod 19 between the inner wall of the counterweight base 6 and the slider 20. The second spring 22 is mainly used for the reset of the slider 20. By rotating the sleeve 8 to drive the cam 23 to rotate, through the cooperation of the cam 23 and the ball, the push rod 19 drives the slider 20 to slide inside the sliding groove 21, thereby changing the elastic potential energy of the second spring 22, and making the push rod 19 push the abutting plate 30 to move, and then adjusting the position of the measuring probe 12.

[0062] In addition, to improve the stability of the movement and use of the measuring probe 12, an insertion cavity 24 is opened above the push rod 19 in the middle section of the housing 5. A second guide rod 25 is slidably installed inside the insertion cavity 24. Preferably, a limiting plate is provided at one end of the second guide rod 25 inserted into the insertion cavity 24, and a third spring 26 is provided between one end of the insertion cavity 24 and the limiting plate outside the second guide rod 25. The other end of the second guide rod 25 extends outside the insertion cavity 24 and is fixedly connected to the upper end of the outer side of the abutting plate 30, so as to improve the stability of the movement of the abutting plate 30 and further improve the stability of the movement and use of the measuring probe 12.

[0063] During use (operation), first move the mobile vehicle body 1 to near the measurement borehole, adjust the position of the wire reel 3 so that the rope 4 is naturally vertical, and lower the measurement main body 100 through the wire reel 3 to a specified depth inside the measurement borehole. During this process, the counterweight base 6 resists the buoyancy or mud resistance inside the measurement borehole, making the falling speed of the measurement main body 100 more stable. The first springs 73 inside the stabilizing assembly 7 cause the first sliding seats 72 to approach each other, thereby changing the angle between the connecting arm 74 and the horizontal plane, and further adjusting the distance between the support plate 75 and the first guide rod 71, so that the traveling wheels 76 contact the inner wall of the measurement borehole to meet the use requirements of measurement boreholes with different inner diameters. Since the support plate 75 is subjected to the thrust of the connecting arm 74, the lateral resistance of the traveling wheels 76 against the inner wall of the measurement borehole increases, avoiding the rotation of the outer shell 5 and improving the stability of the measurement main body 100 during use.

[0064] After the measurement main body 100 falls to the specified depth, start the servo motor 27 to make the driving gear 28 rotate. Through the meshing between the driving gear 28 and the first toothed ring 29, the sleeve 8 rotates, and then drives the cam 23 to rotate. Through the cooperation between the cam 23 and the ball on the push rod 19, the push rod 19 drives the slider 20 to slide inside the chute 21, thereby changing the elastic potential energy of the second spring 22, and making the push rod 19 push the abutting plate 30 to move until the measurement probe 12 abuts against the inner wall of the measurement borehole.

[0065] Meanwhile, the spiral track 16 on the sleeve 8 rotates with the sleeve 8. Through the cooperation between the spiral track 16 and the spiral groove 18, the lifting platform 17 rises inside the outer shell 5, further making the ejector rod 14 rise, so that the ejector rod 14 drives the side support 13 to rotate through the second sliding seat 15, and then makes the support rod 9 rotate, so that the hard protective cover 10 and the flexible protective cover 11 are opened, avoiding the impact of falling objects on the measurement probe 12 and improving the stability of the measurement probe 12 during use. Through the setting of the flexible protective cover 11, after it is unfolded, it can abut against the inner wall of the measurement borehole and deform, preventing the overall outer diameter of the protection assembly from being greater than the inner diameter of the measurement borehole and causing a decline in the protection performance.

[0066] Embodiment Two:

[0067] Please refer to Figures 11 - 16 , a technical solution provided by an embodiment of the present invention, wherein the difference from Embodiment One is:

[0068] As Figures 12 - 14 shown, the outer support assembly provided in this embodiment includes a notch, the notch is arranged at the lower end inside the counterweight base 6, and the number of notches is the same as the number of measurement probes 12. A rotating shaft 32 is rotatably installed in the notch, and one end of the rotating shaft 32 penetrates the inner wall of the notch and extends into the counterweight base 6.

[0069] The outer support component provided in this embodiment further includes a movable frame 31 and a stabilizing rod 38. One end of the movable frame 31 is fixed to the rotating shaft 32, and the movable frame 31 has an "L" - shaped structure. There is a through - groove on the movable frame 31, and the other end of the movable frame 31 is hinged to the upper end of the abutting plate 30. The stabilizing rod 38 is movably arranged in the through - groove. One end of the stabilizing rod 38 is hinged to a third sliding seat 39 that is slidably connected to the outer wall of the housing 5, and the other end of the stabilizing rod 38 is hinged to a fourth sliding seat 40 that is slidably connected to the inner side of the abutting plate 30. Preferably, both the third sliding seat 39 and the fourth sliding seat 40 are pulled by stabilizing springs in a linear track to improve the stability of the stabilizing rod 38 during movement and avoid interference between the stabilizing rod 38 and the movable frame 31.

[0070] As Figures 14 - 16 shown, to drive the rotating shaft 32, the outer support component provided in this embodiment further includes a transmission structure. The transmission structure is arranged in the counterweight base 6 and is used to transmit the power of the sleeve 8 to the rotating shaft 32.

[0071] Specifically, the transmission structure includes a first bevel gear 33 fixed to one end of the rotating shaft 32 and a second toothed ring 37 fixed to the outer side of the sleeve 8 near the lower end. A second bevel gear 34 is rotatably installed inside the counterweight base 6. The second bevel gear 34 meshes with the first bevel gear 33, and a first spur gear 35 is fixed to the lower end of the second bevel gear 34. A second spur gear 36 is also rotatably installed inside the counterweight base 6. The second spur gear 36 meshes with both the first spur gear 35 and the second toothed ring 37.

[0072] During use (operation), the second toothed ring 37 is driven to rotate by the sleeve 8. Through the meshing of the second toothed ring 37 and the second spur gear 36, the second spur gear 36 drives the first spur gear 35 to rotate, further causing the second bevel gear 34 to rotate. Through the meshing of the second bevel gear 34 and the first bevel gear 33, the rotating shaft 32 rotates, and then the movable frame 31 rotates, thereby driving the abutting plate 30 to move. During this process, the distance between the abutting plate 30 and the housing 5 is changed by the movable frame 31, and then the stabilizing rod 38 moves. The stabilizing rod 38 pushes the abutting plate 30, thereby applying a certain pressure to the abutting plate 30, thus improving the stability when the abutting plate 30 contacts the inner wall of the measurement borehole.

[0073] Compared with the first embodiment, the advantage of this embodiment is that the movable range of the movable frame 31 is large, which can meet the use requirements of measurement boreholes with a larger inner diameter.

[0074] Second invention, the present invention also provides a deep - foundation - pit engineering measurement device.

[0075] This deep foundation pit engineering measurement device is substantially similar to the first invention. In this invention, only the measurement main body 100 in the first invention is connected in series to achieve pressure measurement at different depth positions. Specifically, at least two measurement main bodies 100 are provided in this invention, and the two measurement main bodies 100 are arranged on different segments of the rope 4. Different measurement main bodies 100 detect the soil pressure at different depths of the measurement borehole. Preferably, by tying knots at different positions on the rope 4, different segments of the rope 4 are divided. This method has the advantages of simple operation and convenient loading and unloading.

[0076] For example, when it is necessary to measure at 5 meters and 8 meters in the measurement borehole simultaneously, control the distance between the two knotting points at 3 meters. At this time, lower the measurement main body 100 so that the lower measurement main body 100 reaches 8 meters in the measurement borehole, thereby moving the other measurement main body 100 to 5 meters in the measurement borehole. Measure at 5 meters and 8 meters in the measurement borehole simultaneously through the two measurement main bodies 100, so as to obtain the measurement data at 5 meters and 8 meters in the measurement borehole, realize the stratified continuous monitoring at different depths in the same measurement borehole, obtain discrete data, reduce the change of the original soil state of the measurement borehole due to multiple mechanical disturbances, and improve the data credibility.

[0077] In addition, this invention provides a deep foundation pit engineering measurement method.

[0078] Specifically, it includes the following steps:

[0079] Step 1: Obtain a measurement borehole by drilling holes around the foundation pit with a drill.

[0080] Step 2: Use the rope 4 to lower the measurement main body 100 to a specified depth in the measurement borehole.

[0081] Step 3: Drive the servo motor 27 to make the outer support assembly work until the measurement probe 12 is pressed against the inner wall of the measurement borehole and reaches the specified pressure.

[0082] Step 4: Obtain the pressure of the inner wall of the measurement borehole on the measurement probe 12 at different time periods through the measurement probe 12 to obtain the change of the foundation pit soil pressure.

[0083] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0084] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A deep foundation pit engineering survey device, characterized in that It includes a rope (4) and a measuring body (100), wherein the measuring body (100) includes: A housing (5), the diameter of the housing (5) being smaller than the diameter of the measuring borehole; A sleeve (8) rotatably provided inside the housing (5), and the inner diameter of the sleeve (8) being larger than the outer diameter of the rope (4) so that the rope (4) can pass through the sleeve (8); A bottom plate (30) distributed on the periphery of the housing (5), and a measuring probe (12) provided on the side of the bottom plate (30) away from the housing (5); An outer support assembly provided on the housing (5) for driving the bottom plate (30) to move radially along the housing (5) so that the measuring probe (12) contacts or does not contact the inner wall of the measuring borehole, and the outer support assembly is driven by a servo motor (27); It further includes a stabilizing assembly (7) provided on the periphery of the housing (5) for increasing the resistance when the housing (5) rotates around the rope (4); A counterweight base (6) installed at the lower end of the housing (5) for increasing the self-weight of the measuring body (100); It further includes a protective assembly for shielding falling objects in the measuring borehole when the measuring probe (12) is in use, and the protective assembly includes: A support rod (9) hinged to the upper end of the housing (5), the support rod (9) being located above the measuring probe (12), and the number of support rods (9) being the same as that of the measuring probes (12); A rigid protective cover (10) installed on the support rod (9), and a flexible protective cover (11) fixed to the end of the rigid protective cover (10) away from the housing (5), both the rigid protective cover (10) and the flexible protective cover (11) being arc-shaped structures; It further includes a lifting assembly provided inside the housing (5) for driving the support rod (9) to move, and the lifting assembly includes: A side bracket (13) provided at one end of the support rod (9), and the angle between the side bracket (13) and the support rod (9) being an obtuse angle; A lifting platform (17) provided outside the sleeve (8), and the lifting platform (17) sliding axially along the housing (5), a top rod (14) being fixed on the lifting platform (17), the upper end of the top rod (14) being hinged to a second sliding seat (15), and a slide rail for sliding connection with the second sliding seat (15) being provided inside the side bracket (13); A spiral track (16) provided outside the sleeve (8), a spiral groove (18) adapted to the spiral track (16) being formed inside the lifting platform (17), and the rotation of the sleeve (8) being able to drive the lifting platform (17) to lift through the spiral groove (18) by the spiral track (16); The servo motor (27) is fixed at a position close to the lower end inside the housing (5), and a driving gear (28) is installed at the output end of the servo motor (27), and a first toothed ring (29) is fixedly sleeved outside the sleeve (8), and the driving gear (28) meshes with the first toothed ring (29).

2. The measuring device for deep foundation pit engineering according to claim 1, characterized in that, The stabilizing assembly (7) includes: A support plate (75), the support plate (75) is arranged outside two adjacent outer support components, and the support plate (75) can move radially along the outer shell (5); A walking wheel (76), the walking wheel (76) is arranged on the support plate (75), and an arc-shaped notch is arranged on the surface of the walking wheel (76); A first guide rod (71), the first guide rod (71) is fixed on the outside of the outer shell (5), and first sliding seats (72) are symmetrically and slidably installed on the first guide rod (71); A connecting arm (74), the connecting arm (74) is arranged between the corresponding first sliding seat (72) and the support plate (75), and both ends of the connecting arm (74) are respectively hinged to the support plate (75) and the first sliding seat (72); Two first springs (73), and the first springs (73) are located between one end of the first guide rod (71) and the corresponding first sliding seat (72).

3. The measuring device for deep foundation pit engineering according to claim 1, characterized in that, The outer support component includes: A cam (23), the cam (23) is fixedly sleeved on the lower end outside the sleeve (8), and the number of convex surfaces on the cam (23) is the same as the number of measuring probes (12); A push rod (19), one end of the push rod (19) is fixedly connected to the abutting plate (30), and the other end of the push rod (19) extends into the outer shell (5); A slider (20), a chute (21) is arranged at the inner bottom of the counterweight base (6), the slider (20) is slidably installed in the chute (21), the push rod (19) is fixedly connected to the slider (20), and one end of the push rod (19) penetrates through the slider (20) and is installed with a ball that abuts against the side surface of the cam (23); A second spring (22), the second spring (22) is arranged outside the push rod (19) and is located between the inner wall of the counterweight base (6) and the slider (20).

4. The measuring device for deep foundation pit engineering according to claim 1, characterized in that, The outer support component includes: Notches, the notches are arranged at the lower end inside the counterweight base (6), and the number of notches is the same as the number of measuring probes (12); A rotating shaft (32), the rotating shaft (32) is rotatably installed in the notch, and one end of the rotating shaft (32) penetrates through the inner wall of the notch and extends into the counterweight base (6); A movable frame (31), the movable frame (31) is fixed on the outside of the rotating shaft (32), and the movable frame (31) is in an "L" shape structure, a through groove is arranged on the movable frame (31), and the other end of the movable frame (31) is hinged to the abutting plate (30); A stabilizing rod (38), the stabilizing rod (38) is movably arranged in the through groove, one end of the stabilizing rod (38) is hinged with a third sliding seat (39) that is slidably connected to the outer wall of the outer shell (5), and the other end of the stabilizing rod (38) is hinged with a fourth sliding seat (40) that is slidably connected to the inner side of the abutting plate (30); A transmission structure, the transmission structure is arranged in the counterweight base (6) and is used to transmit the power of the sleeve (8) to the rotating shaft (32).

5. A deep foundation pit engineering survey device according to any one of claims 1-4, characterized in that: There are at least two measuring bodies (100), and the two measuring bodies (100) are arranged on different segments of the rope (4), and different measuring bodies (100) detect the soil pressure at different depths of the measuring borehole.

6. A deep foundation pit engineering survey method, characterized in that, A deep foundation pit engineering measurement device according to claim 1, comprising the following steps: Step 1: Obtain measuring boreholes by drilling holes around the foundation pit with a drill; Step 2: Use a rope (4) to lower the measurement body (100) to the specified depth in the measurement borehole; Step 3: Drive the servo motor (27) to operate the outer support assembly until the measurement probe (12) is pressed against the inner wall of the measurement borehole and reaches the specified pressure; Step 4: Obtain the pressure exerted by the inner wall of the measurement borehole on the measurement probe (12) at different time intervals through the measurement probe (12) to obtain the change in the foundation pit soil pressure.

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