A progressively variable diameter penetration test device for deep soil penetration testing

Abstract

The present invention relates to the field of soil penetration technology, and in particular to a progressively variable diameter penetration test device for deep soil penetration testing, comprising a nested-structure penetration rod and an assembled force-applying device, the force-applying device being used to apply force to the penetration rod to press it into the soil. The advantages of the present invention are: by changing the cross-sectional diameter of the penetration device, the frictional resistance of deep, high-stress foundation soil on the penetration device is reduced; by progressively operating different penetration rods, the penetration test depth is increased; the present invention has the advantages of a reasonable technical solution, strong innovation, strong operability, the ability to effectively deepen the penetration test depth, and the expansion of the applicability of penetration test projects.

Description

Technical Field

[0001] The invention relates to the technical field of soil penetration, in particular to a progressively variable diameter penetration testing device for deep soil penetration testing. Background Art

[0002] In recent years, the country has often needed to analyze the stress state of proposed structures at construction sites during various types of infrastructure construction, often requiring soil stress measurement. The penetration test is a commonly used method for testing foundation soil stress. Because foundation soil stress increases with depth, penetration of the penetration equipment can be difficult due to friction in the soil when the penetration depth is too deep. Therefore, the penetration test depth in deep soil layers is limited, and so is the applicability of the penetration test method in engineering projects. Summary of the Invention

[0003] The purpose of the present invention is to provide a progressive diameter-varying sounding test device for deep soil sounding test based on the above-mentioned deficiencies of the prior art. By designing a nested sounding rod and an assembled force-applying device, and setting the sounding rod and the force-applying device to a variable diameter structure, a progressive sounding test of deep soil can be achieved.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] A progressively variable diameter penetration test device for deep soil penetration testing, characterized by:

[0006] It includes a nested sounding rod and an assembled force-applying device, wherein the force-applying device is used to apply force to the sounding rod to press it into the soil;

[0007] The sounding rod is composed of an outer sounding rod, an inner sounding rod and a central sounding rod which are nested together, wherein the central sounding rod is arranged inside the rod body of the inner sounding rod and the central sounding rod can be extended and retracted relative to the inner sounding rod, the inner sounding rod is arranged inside the outer sounding rod and the inner sounding rod can be extended and retracted relative to the outer sounding rod, the tops of the outer sounding rod, the inner sounding rod and the central sounding rod are respectively provided with top platforms, the sizes of the outer top platform of the outer sounding rod, the inner top platform of the inner sounding rod and the central top platform of the central sounding rod gradually decrease, and the bottom of the inner sounding rod is provided with a sounding device for performing a sounding test;

[0008] The force-applying device is composed of an outer top body, an inner top body and a central top body, wherein the central top body is provided with a top rod, and the outer top body and the inner top body are nested on the top rod in sequence, the outer top body matches the outer top platform of the outer layer feeler rod, the inner top body matches the inner top platform of the inner layer feeler rod, and the central top body matches the central top platform of the central feeler rod.

[0009] The top platforms of the outer layer probing rod, the inner layer probing rod and the center probing rod are respectively larger than their respective rod diameters. An outer bottom platform is provided inside the outer layer probing rod, and an inner bottom platform is provided inside the inner layer probing rod. The outer bottom platform of the outer layer probing rod matches with the inner top platform of the inner layer probing rod to limit the extension and retraction of the inner layer probing rod, and the inner bottom platform of the inner layer probing rod matches with the center top platform of the center probing rod to limit the extension and retraction of the center probing rod.

[0010] The probing device includes a sensing rod, a sensing wire and a probing head. The sensing rod is arranged inside the inner probing rod. The sensing rod is connected to the probing head through the sensing wire. The probing head is arranged at the bottom of the inner probing rod and is engaged with a slot provided at the bottom of the inner probing rod.

[0011] The outer layer feeler rod, the inner layer feeler rod and the bottom of the feeler device are combined to form a cone tip.

[0012] A fastening thread is provided on the top rod of the central top body, and a mounting hole with an internal thread is respectively opened on the outer top body and the inner top body. The mounting hole is nested on the top rod and forms a threaded connection with the fastening thread.

[0013] A data transmission line is provided inside the inner top body, and a sensing groove matching the sensing rod of the probe device is provided at the bottom of the inner top body, and the sensing rod is clamped in the sensing groove.

[0014] A stress buffer ring is provided at the bottom of the outer top platform of the outer layer feeler rod.

[0015] The top of the push rod is connected with a force applying device.

[0016] The advantages of the present invention are: by changing the cross-sectional diameter of the probing equipment, the frictional resistance of deep high-stress foundation soil to the probing equipment is reduced; by progressive operation of different probing rods, the probing test depth is increased; it has the advantages of reasonable technical solutions, strong innovation, strong operability, and can effectively deepen the probing test depth and expand the applicability of probing test projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the outer layer probe rod of the present invention;

[0018] Figure 2 Schematic diagram of the structure of the inner layer feeler rod in the present invention;

[0019] Figure 3 Schematic diagram of the structure of the center feeler rod in the present invention;

[0020] Figure 4 Schematic diagram of the structure of the stress buffer ring in the present invention;

[0021] Figure 5 Schematic diagram of the assembly structure of the outer layer feeler rod, the inner layer feeler rod, the center feeler rod and the stress buffer ring in the present invention;

[0022] Figure 6 Schematic diagram of the structure of the force applying device in the present invention;

[0023] Figure 7 This is a schematic diagram of the force-applying device in the present invention in use;

[0024] Figure 8 It is a usage state diagram of the present invention;

[0025] Figure 9 FIG. 1 is a diagram showing the extended state of the feeler rod in the present invention;

[0026] Figure 10 Schematic diagram of the structure of the touch probe in the present invention. DETAILED DESCRIPTION

[0027] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0028] like Figure 1-10 As shown in the figure, marks 1-38 respectively represent: outer layer sounding rod 1, inner layer sounding rod 2, central sounding rod 3, outer retaining ring 4, outer top platform 5, outer bottom platform 6, outer excavation body 7, outer top cavity 8, inner bottom cavity 9, inner retaining ring 10, inner top platform 11, inner bottom platform 12, inner excavation body 13, inner top cavity 14, inner bottom cavity 15, center retaining ring 16, center top platform 17, card slot 18, sensing line 19, sensing rod 20, sounding probe 21, card rod 22, outer top body 23, inner top body 24, center top body 25, mounting hole 26, mounting hole 27, top rod 28, fastening thread 29, sensing slot 30, data transmission line 31, outer card platform 32, inner card platform 33, center card platform 34, card cavity 35, top cavity 36, force applying device 37, stress buffer ring 38.

[0029] Example: Figures 1 to 10As shown, the main body of the gradual variable diameter method sounding test device for deep soil sounding test in this embodiment is divided into two parts: a sounding rod with a nested structure and a force-applying device with an assembled structure. The sounding rod is used to realize the sounding test of deep soil, and the force-applying device is used to press the sounding rod into or pull out of the deep soil.

[0030] Combine Figures 1 to 5 As shown, the sounding rod in this embodiment includes three layers of sounding rods, namely, an outer sounding rod 1, an inner sounding rod 2, and a center sounding rod 3, which are nested with each other. Each layer of sounding rod can adapt to the frictional resistance of foundation soil at different depths to the sounding equipment. At the same time, the three layers of sounding rods adopt a variable diameter structure, wherein the outer sounding rod 1 is the sounding rod with the largest diameter, the center sounding rod 3 is the sounding rod with the smallest diameter, and the inner sounding rod 2 is the sounding rod between the outer sounding rod 1 and the center sounding rod 3.

[0031] Specifically, an outer retaining ring 4 is formed at the top of the outer sounding rod 1. The diameter of this outer retaining ring 4 is slightly larger than the diameter of the outer sounding rod 1. The diameter change at the point where the outer retaining ring 1 contacts the rod body forms an outer top platform 5. The bottom of the outer sounding rod 1 is an outer boring body 7. The diameter of the outer surface of the outer boring body 7 gradually decreases from the upper plane to the lower plane. The top of the outer boring body 7 protrudes into the interior of the sounding rod cavity to form an outer bottom platform 6. The inner diameter of the outer bottom platform 6 is the same as the inner diameter of the bottom of the outer boring body 7. The outer retaining ring 4 forms an outer top cavity 8 at the top of the outer sounding rod 1, and the outer boring body 7 forms an inner bottom cavity 9 at the bottom.

[0032] like Figure 2 As shown, the overall structure of the inner layer sounding rod 2 is the same as that of the outer layer sounding rod 1. Inner retaining ring 10, inner top platform 11, inner bottom platform 12, inner excavation body 13, inner top cavity 14, and inner bottom cavity 15 are respectively distributed at positions corresponding to the outer layer sounding rod 1. Among them, the outer diameter of the inner retaining ring 10 of the inner layer sounding rod 2 is equivalent to the inner diameter of the outer top platform 5 and the outer diameter of the outer bottom platform 6 of the outer layer sounding rod 1. The outer diameter of the rod body of the inner layer sounding rod 2 is equivalent to the diameter of the inner bottom cavity 9 of the outer layer sounding rod 1. The inner layer sounding rod 2 can move downward through the outer top cavity 8 of the outer layer sounding rod 1 and finally be stuck on the outer bottom platform 6 through the bottom surface of the inner top platform 11, thereby limiting the movement stroke of the inner layer sounding rod 2.

[0033] Combine Figure 3 and Figure 10As shown, the top of the center feeler rod 3 is provided with a center retaining ring 16 and a center top platform 17. The outer diameter of the center retaining ring 16 is equivalent to the inner diameter of the inner feeler rod 3 and the outer diameter of the inner bottom platform 12. A retaining groove 18 is provided at the bottom of the center feeler rod 3, which is recessed toward the top of the rod. A sensing wire 19, which is disposed within the rod, passes through the top of the retaining ring 16. One end of the sensing wire 19 extends to a sensing rod 20 disposed on the center top platform 17 within the center retaining ring 16. The retaining groove 18 is primarily used to connect to a contact probe 21. A retaining rod 22 is disposed at the top of the probe 21. By inserting the retaining rod 22 into the retaining groove 18, the probe 21 is connected to the center feeler rod 3, forming a contact connection with the other end of the sensing wire 19. The central feeler rod 3 can move downward through the inner top cavity 14 of the inner layer feeler rod 2, and finally be stuck on the inner bottom platform 12 of the inner layer feeler rod 2 through the central top platform 17, thereby limiting the moving stroke of the central feeler rod 3.

[0034] Combine Figure 6 and Figure 7 As shown, the force-applying device is assembled from an outer top body 23, an inner top body 24, and a center top body 25. The top of the outer top body 23 is provided with an internally threaded mounting hole 26, and the top of the inner top body 24 is provided with an internally threaded mounting hole 27. The outer diameter of the center top body 25 is equivalent to the inner diameter of the center retaining ring 16 at the top of the center feeler rod 3. Sensing slots 30 corresponding to the sensing rod 20 are distributed within the center top body 25. The connection between the center top body 25 and the center feeler rod 3 can be achieved by inserting the sensing rod 20 into the sensing slots 30 and simultaneously inserting the center top body 25 into the center retaining ring 16. A push rod 28 is provided at the top of the central top body 25. The diameter of the push rod 28 is slightly smaller than the diameter of the central top body 25 and matches the inner diameter of the external threaded hole 26 and the mounting hole 27. A fastening thread 29 is provided on the periphery of the push rod 28 near the position of the central top body 25. An outer clamping platform 32 is distributed on the inner side of the outer top body 23 near the top. The inner diameter of the outer clamping platform 32 is equivalent to the outer diameter of the inner top body 24. An inner clamping platform 33 is distributed on the inner side of the inner top body 24 near the top. The inner diameter of the inner clamping platform 33 is equivalent to the outer diameter of the central top body 25 and the outer diameter of the central clamping platform 34. The inner top body 24 and the outer top body 23 can be embedded in the push rod 28 through the mounting holes 27 and the mounting holes 26 in turn and connected to the central top body 25 through the fastening threads 29.

[0035] The inner part of the top rod 28 and the inner part of the top of the sensing groove 30 are provided with a data transmission line 31 for transmitting the test data of the touch probe 21. The outer top body 23, the inner top body 24 and the center top body 25 are assembled to form a force applying device. Figure 7 As shown, a card cavity 35 is formed between each card platform at the bottom of the force-applying device and each top body. When the outer layer feeler rod 1, the inner layer feeler rod 2, and the center feeler rod 3 are combined to form Figure 5When placed on the same horizontal plane as shown, a top cavity 36 is formed between the outer retaining ring 4, the inner retaining ring 10 and the center retaining ring 16. The top bodies of the force-applying device can be embedded in the top cavity 36, and the retaining rings of the probing device can be synchronously embedded in the retaining cavity 35. This kind of interlocking method between the force-applying device and the probing rod can enhance the interlocking strength between the devices, thereby ensuring the stability and verticality of the probing rod when pressed in, thereby improving the test accuracy of the probing test.

[0036] At the same time, if Figure 5 As shown, the outer excavation body 7 at the bottom of the outer layer sounding rod 1, the inner excavation body 13 at the bottom of the inner layer sounding rod 2 and the sounding head 21 are combined to form a cone, so that each sounding rod and the sounding head 21 at the bottom can be pressed into the soil layer synchronously, and further facilitates pressing the sounding head 21 into the deep soil.

[0037] like Figure 7 As shown, the push rod 28 is connected to a force-applying device 37 located on the ground surface. When the outer push rod 23 and the inner push rod 24 are engaged with the center push rod 25, force can be applied to the entire sounding device. When the outer push rod 23 is removed from the push rod 28, force can be applied to the inner sounding rods 2 and the center sounding rod 3. When the inner push rod 24 is removed from the push rod 28, force can be applied to the center sounding rod 3. Throughout the test process, the outer excavation body 7 and the inner excavation body 13 move synchronously with the outer sounding rods 1 and the inner sounding rods 2, and the sounding head 21 moves synchronously with the center sounding rod 3. When the outer excavation body 7 and the inner excavation body 13 are separated in sequence, they can respectively surround the outside of the inner layer sounding rod 2 near the bottom of the inner retaining ring 10 and the outside of the center sounding rod 3 near the bottom of the center retaining ring 16. When the equipment is pulled out, the soil adhered to the outer wall of the sounding rod can be removed to avoid the soil entering the interior of the sounding rod and causing the rod to be blocked, and it is convenient for reuse.

[0038] In order to reduce the soil resistance when the sounding equipment enters the foundation soil, a stress buffer ring 38 is provided on the outer sounding rod 1. The stress buffer ring 38 can be embedded outside the outer sounding rod 1 and below the outer clamping ring 4.

[0039] The testing method of this embodiment is as follows:

[0040] (1) Nest the outer layer probe rod 1, the inner layer probe rod 2, and the center probe rod 3 in sequence and keep them in the same horizontal plane to form a nested structure of probe rods, such as Figure 5 shown.

[0041] (2) The outer top body 23 and the inner top body 24 are respectively embedded in the top rod 28 through the external threaded hole 26 and the mounting hole 27, and finally embedded in the fastening thread 29, so that the outer top body 23, the inner top body 24 and the center top body 25 are assembled to form a force-applying device, such as Figure 7 shown.

[0042] (3) If Figure 8As shown, the force applying device is uniformly moved so that the inner snap ring 10 and the center snap ring 16 correspond to the card cavity 35 respectively, the outer top body 23 and the inner top body 24 correspond to the top cavity 36 formed by each snap ring respectively, and the center top body 25 corresponds to the cavity formed by the center snap ring 16, as shown. Figure 8 shown.

[0043] (4) The force-applying device is rotated in the opposite direction of the thread direction of the fastening thread 29 so that the force-applying device is embedded in the feeler rod, and the sensing rod 20 of the center feeler rod 3 is simultaneously embedded in the sensing groove 30 of the center top body 34.

[0044] (5) Move the stress buffer ring 38 upward through the bottom of the probe rod and embed it into the bottom area of the outer clamping ring 4 at the top of the outer layer probe rod 1.

[0045] (6) Apply downward pressure to the push rod 28 through the force-applying device 37, so that the outer feeler rod 1, the inner feeler rod 2, and the center feeler rod 3 are moved downward as a whole, and the touch probe data measured by the touch probe head 21 are collected in real time.

[0046] (7) When step (6) is operated to a certain depth and cannot be moved further downward, the outer top body 23 is removed and the threaded connection between it and the top rod 28 is released, and the positions of the inner top body 24 and the central top body 25 remain unchanged.

[0047] (8) Combination Figure 8 and Figure 9 As shown, the force-applying device 37 continues to apply pressure to the push rod 28, the position of the outer layer feeler rod 1 remains unchanged, the inner layer feeler rod 2 and the center feeler rod 3 continue to move downward, and the feeler data measured by the feeler head 21 continue to be collected.

[0048] (9) When the inner layer feeler rod 2 is inserted into the outer bottom platform 6, the inner top body 24 is removed to release the threaded connection between it and the top rod 28, and the position of the central top body 25 remains unchanged.

[0049] (10) Continue to apply pressure to the top rod 28 through the force-applying device 37, the position of the inner layer feeler rod 2 remains unchanged, and the center feeler rod 3 continues to move downward under the action of the center top body 25, and continues to collect data collected by the feeler head 21.

[0050] (11) After the test is completed, a pulling force is applied to the top rod by the force-applying device 37 to move the center sounding rod 3 upward, and the soil on the side wall of the rod is scraped away by the inner excavation body 13.

[0051] (12) When the center feeler rod 3 is moved upward into position, the inner top body 24 is embedded in the fastening thread 29 on the top rod 28, and then the inner layer feeler rod 2 is moved upward by the force-applying device 37, and the soil on the side wall of the rod is scraped off by the outer excavation body 7.

[0052] (13) When the outer layer of the probe rod 1 is moved upward to its position, the outer top body 23 is embedded in the fastening thread 29 on the top rod 28, and then the outer layer of the probe rod 1 is moved upward by the force-applying device 37 until the entire probe rod is moved out of the soil.

[0053] During implementation, the length of the ejector rod 28 can be adjusted based on field application needs. The shafts of the outer feeler rod 1, inner feeler rod 2, and center feeler rod 3, after removing the outer snap ring 4, inner snap ring 10, and center snap ring 16, can be lengthened or shortened as needed. The fastening threads 29 of the ejector rod 28 can be remotely controlled by a force-applying device. Furthermore, by configuring the outer and inner ejector bodies 23, 24 with rotating motors or other devices, the outer and inner ejector bodies 23, 24 can be automatically engaged or disengaged from the ejector rod 28.

[0054] In addition to the three-layer structure of the outer sounding rod 1, the inner sounding rod 2 and the center sounding rod 3 used in this embodiment, a four-layer or more structure can be adopted and a corresponding number of force-applying top bodies can be configured according to the sounding depth requirements of the soil, thereby further improving the sounding depth of the sounding rod.

[0055] Although the above embodiments have described the concepts and embodiments of the present invention in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described in detail here.

Claims

1. A progressively variable diameter penetration test device for deep soil penetration testing, characterized by: It includes a nested sounding rod and an assembled force-applying device, wherein the force-applying device is used to apply force to the sounding rod to press it into the soil; The sounding rod is composed of an outer sounding rod, an inner sounding rod and a central sounding rod which are nested together, wherein the central sounding rod is arranged inside the rod body of the inner sounding rod and the central sounding rod can be extended and retracted relative to the inner sounding rod, the inner sounding rod is arranged inside the outer sounding rod and the inner sounding rod can be extended and retracted relative to the outer sounding rod, the tops of the outer sounding rod, the inner sounding rod and the central sounding rod are respectively provided with top platforms, the sizes of the outer top platform of the outer sounding rod, the inner top platform of the inner sounding rod and the central top platform of the central sounding rod gradually decrease, and the bottom of the inner sounding rod is provided with a sounding device for performing a sounding test; The force-applying device is composed of an outer top body, an inner top body and a central top body, wherein the central top body is provided with a top rod, the outer top body and the inner top body are sequentially nested on the top rod, the outer top body matches the outer top platform of the outer layer feeler rod, the inner top body matches the inner top platform of the inner layer feeler rod, and the central top body matches the central top platform of the central feeler rod; The top platforms of the outer layer feeler rod, the inner layer feeler rod and the center feeler rod are respectively larger than their respective rod diameters; an outer bottom platform is provided inside the outer layer feeler rod, and an inner bottom platform is provided inside the inner layer feeler rod; the outer bottom platform of the outer layer feeler rod matches the inner top platform of the inner layer feeler rod to limit the extension and retraction of the inner layer feeler rod; the inner bottom platform of the inner layer feeler rod matches the central top platform of the center feeler rod to limit the extension and retraction of the center feeler rod; A fastening thread is provided on the top rod of the central top body, and a mounting hole with an internal thread is respectively opened on the outer top body and the inner top body. The mounting hole is nested on the top rod and forms a threaded connection with the fastening thread.

2. The progressively variable diameter penetration test device for deep soil penetration testing according to claim 1, characterized in that: The probing device includes a sensing rod, a sensing wire and a probing head. The sensing rod is arranged inside the inner probing rod. The sensing rod is connected to the probing head through the sensing wire. The probing head is arranged at the bottom of the inner probing rod and is engaged with a slot provided at the bottom of the inner probing rod.

3. The progressively variable diameter penetration test device for deep soil penetration testing according to claim 1, characterized in that: The outer layer feeler rod, the inner layer feeler rod and the bottom of the feeler device are combined to form a cone tip.

4. The progressively variable diameter penetration test device for deep soil penetration testing according to claim 1, characterized in that: A data transmission line is provided inside the inner top body, and a sensing groove matching the sensing rod of the probe device is provided at the bottom of the inner top body, and the sensing rod is clamped in the sensing groove.

5. The progressively variable diameter penetration test device for deep soil penetration testing according to claim 1, characterized in that: A stress buffer ring is provided at the bottom of the outer top platform of the outer layer feeler rod.

6. The progressively variable diameter penetration test device for deep soil penetration testing according to claim 1, characterized in that: The top of the push rod is connected with a force applying device.

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