Static sounding probe with vane shearing function

Abstract

The static sounding probe comprises a vane shearing component, a side wall friction component and a conical probe component which are sequentially connected from top to bottom, the vane shearing component comprises an upper limiting cap and a base, the upper limiting cap is provided with an upper threaded connector, and a tubular hydraulic cylinder is arranged in the center of the upper limiting cap; an annular columnar cavity is formed in the periphery of the hydraulic cylinder, auxiliary holes are formed in the upper portion of the annular columnar cavity, the upper limiting cap is connected with a rotating column, a T-shaped cross shear plate is placed in the rotating column, and the rotating column is connected with a base through the bottom. By improving the vane shear apparatus, the vane shear apparatus can be carried on a static sounding instrument, so that two in-situ tests can be carried out at the same time, that is, an in-situ vane shear test can be carried out while an in-situ static sounding test is carried out, and the vane shear apparatus has the advantages of simple structure, convenience in operation and high practicability.

Description

Technical Field

[0001] The invention relates to the field of geotechnical engineering investigation, in particular to a static penetration probe with cross-plate shearing. Background Art

[0002] In-situ soil testing refers to testing directly at the test site without collecting soil samples. General in-situ tests include load tests, static penetration tests, lateral pressure tests, cross-plate shear tests, etc. Among them, static penetration tests can be divided into single-bridge static penetration tests, double-bridge static penetration tests and pore pressure static penetration tests according to the probe. In addition to measuring the cone tip resistance and side wall resistance when the probe penetrates the soil, pore pressure static penetration tests can also measure the pore water pressure in the soil, which can obtain more accurate soil mechanical parameters. The cross-plate shear test is an in-situ testing technology that can test the strength parameters of the soil on site. It is especially widely used in determining the shear strength of saturated soft clay soil. The general testing process is to first press the cross-plate into the soil to a certain depth, then apply torque to the cross-plate so that the cross-plate can be twisted in the soil to produce a cylindrical failure surface, and then calculate to determine the undrained shear strength of the soil and its sensitivity and other indicators. Since it is an in-situ testing technology, the cross-plate shear test does not require soil sampling and other processes, which can reduce the disturbance to the soil and save test costs.

[0003] In the past, static penetration tests and cross-plate shear tests were conducted separately, requiring multiple drillings into the same area, which would consume a lot of testing costs.

[0004] Based on the above situation, the present invention proposes a static penetration probe with cross-plate shearing to effectively solve the above problems. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a static penetration probe with cross-plate shear, which can carry out an in-situ cross-plate shear test while conducting a static penetration test. Only one penetration is required to complete two in-situ test tests and obtain more data on the stratum soil.

[0006] The present invention adopts the following technical solution: A static penetration probe with cross plate shear, comprising a cross plate shear component, a side wall friction component and a conical probe component connected in sequence from top to bottom, the cross plate shear component comprising an upper limit cap with an upper threaded joint and a base, a tubular hydraulic cylinder is arranged at the center of the upper limit cap, an annular columnar cavity is arranged around the hydraulic cylinder, an auxiliary hole is opened on the upper part of the annular columnar cavity, the upper limit cap is connected to a rotating column, a T-shaped cross shear plate is placed inside the rotating column, and the rotating column is connected to the base through the bottom.

[0007] Furthermore, the lower portion of the upper limit cap includes a limiting groove, the top of the rotating column is provided with an upper limit hook, and the upper limit cap is connected to the upper limit hook of the rotating column through the bottom limiting groove.

[0008] Furthermore, the rotating column has four radially annularly distributed cubic cavities inside, and T-shaped cross shear plates are placed inside the cubic cavities.

[0009] Furthermore, an elongated hole is provided on the radially inner side of the cubic cavity, and contraction holes are provided on both radially outer sides of the cubic cavity. An inner threaded annular body is adjacent to the lower part of the elongated hole, and the inner threaded annular body is sleeved on the middle thread.

[0010] Furthermore, the outer end of the T-shaped cross shear plate is covered with a cross plate waterproof cover.

[0011] Furthermore, four cylindrical holes that are transparent from top to bottom are spaced apart between the four cubic cavities, an annular lower limit hook is provided at the bottom of the rotating column, the lower limit hook is connected to the lower limit groove, and the rotating column is connected to the base through the bottom lower limit hook.

[0012] Furthermore, a lower limit groove is provided on the top of the base, and a columnar cavity buffer chamber is included in the center of the base. Lower guide rails are included on both sides of the interior of the buffer chamber, and the lower guide rails are connected to the lower guide grooves. A buffer cavity is provided outside the buffer chamber, and a data channel is opened at the bottom of the buffer cavity. The base is connected to the side wall friction component through a threaded joint.

[0013] Furthermore, a small-diameter circular hole is opened on the upper part of the hydraulic cylinder, a large-diameter circular hole is opened on the bottom, and a hydraulic rod is connected inside the hydraulic cylinder.

[0014] Furthermore, two symmetrical upper guide grooves are arranged on the upper part of the hydraulic rod, and the upper guide grooves are connected to the upper guide rails at the bottom of the hydraulic cylinder.

[0015] Furthermore, a middle thread is arranged in the middle of the hydraulic rod, and the middle thread is sleeved inside the inner threaded annular body. A lower guide groove is arranged at the bottom of the hydraulic rod and is connected to a lower guide rail in the base.

[0016] The present invention provides a static penetration probe with cross-plate shear: by improving the cross-plate shear instrument, it can be mounted on the static penetration instrument, and then two in-situ tests can be carried out at the same time, that is, an in-situ cross-plate shear test can be carried out while an in-situ static penetration test is being carried out. It has the advantages of simple structure, easy operation and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2This is a schematic diagram of a cross plate shear member of the present invention; Figure 3 It is a cross-sectional schematic diagram of the rotating column of the present invention; Figure 4 This is a schematic diagram of the upper limit cap of the present invention; Figure 5 It is a schematic diagram of the rotating column of the present invention; Figure 6 It is a schematic diagram of the base of the present invention; Figure 7 It is a schematic diagram of the hydraulic rod of the present invention; Figure 8 It is a schematic diagram of a T-shaped cross shear plate of the present invention.

[0018] The numbers marked in the figure are represented in sequence: 1-conical probe component, 2-side wall friction component, 3-cross plate shear component, 30-upper limit cap, 31-hydraulic cylinder, 32-annular cylindrical cavity, 33-auxiliary hole, 34-upper limit slot, 35-upper guide rail, 40-rotating column, 41-inner threaded ring body, 42-lower limit hook, 43-elongation hole, 44-upper limit hook, 45-contraction hole, 46-T-shaped cross shear plate, 47-cross plate waterproof cover, 48-cylindrical hole, 49-cubic cavity, 50-base, 51-lower guide rail, 52-lower limit slot, 53-data channel, 54-buffer cavity, 55-buffer chamber, 60-hydraulic rod, 61-upper guide slot, 62-middle thread, 63-lower guide slot. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Refer to the attached Figure 1-8 A static penetration probe with cross plate shear comprises a cross plate shear component 3, a side wall friction component 2 and a conical probe component 1 which are sequentially connected from top to bottom. The cross plate shear component 1 comprises an upper limit cap 30 with an upper threaded joint and a base 50. A tubular hydraulic cylinder 31 is arranged at the center of the upper limit cap 30. An annular columnar cavity 32 is arranged around the hydraulic cylinder 31. An auxiliary hole 33 is opened at the upper part of the annular columnar cavity 32. The upper limit cap 30 is connected to a rotating column 40. A T-shaped cross shear plate 46 is placed inside the rotating column 40. The rotating column 40 is connected to the base 50 through the bottom.

[0021] The three components are connected in sequence up and down by threads. The side wall friction component 2 and the conical probe component 1 have relatively mature technologies and will not be described here.

[0022] The upper limit cap 30 includes a limiting groove 34 at the bottom, and an upper limit hook 44 is provided at the top of the rotating column 40 . The upper limit cap 30 is connected to the upper limit hook 44 of the rotating column 40 through the bottom limiting groove 34 .

[0023] The rotating column 40 has four radially annularly distributed cubic cavities 49 inside, and a T-shaped cross shear plate 46 is placed inside the cubic cavity 49 .

[0024] An elongated hole 43 is provided radially inwardly on one side of the cubic cavity 49 , and contraction holes 45 are provided radially outwardly on both sides of the cubic cavity 49 . An inner threaded annular body 41 is adjacent to the lower part of the elongated hole 43 , and the inner threaded annular body 41 is sleeved on the middle thread 62 .

[0025] The outer end of the T-shaped cross shear plate 46 is covered with a cross plate waterproof cover 47 .

[0026] Four cylindrical holes 48 that are transparent from top to bottom are spaced apart between the four cubic cavities 49 . An annular lower limit hook 42 is provided at the bottom of the rotating column 40 . The lower limit hook 42 is connected to the lower limit groove 52 . The rotating column 40 is connected to the base 50 via the lower limit hook 42 .

[0027] The top of the base 50 is provided with a lower limit groove 52, the center of the base 50 includes a columnar cavity buffer chamber 55, the two sides of the buffer chamber 55 contain lower guide rails 51, the lower guide rails 51 are connected to the lower guide groove 63, the buffer chamber 55 is provided with a buffer cavity 54 outside, the bottom of the buffer cavity 54 is provided with a data channel 53, and the base 50 is connected to the side wall friction member 2 through a threaded joint. The hydraulic cylinder 31 has a small diameter circular hole on the top and a large diameter circular hole on the bottom. The hydraulic cylinder 31 is internally connected to a hydraulic rod 60 .

[0028] Two symmetrical upper guide grooves 61 are provided on the upper portion of the hydraulic rod 60 , and the upper guide grooves 61 are connected to the upper guide rail 35 at the bottom of the hydraulic cylinder 31 .

[0029] A middle thread 62 is disposed in the middle of the hydraulic rod 60 , and the middle thread 62 is sleeved inside the inner threaded annular body 41 . A lower guide groove 63 is disposed at the bottom of the hydraulic rod 60 and is connected to the lower guide rail 51 in the base 50 .

[0030] In the present invention, the elongated hole 43 and the contraction hole 45 are connected by a flexible hydraulic pipe. When a cross-plate shear test is required, liquid is injected into the elongated hole 43. The liquid pressure can push the T-shaped cross-shear plate 46 outward to extend the cross-plate.

[0031] When hydraulic pressure is injected into the contraction hole 45, the T-shaped cross shear plate 46 can be retracted. The initial position of the top of the hydraulic rod 60 is located inside the hydraulic cylinder 31. Injecting liquid into the hydraulic cylinder 31 causes the hydraulic rod 60 to move downward, and the hydraulic rod can only move downward without rotation under the restriction of the upper and lower guide rails. Since the middle thread 62 of the hydraulic rod is engaged with the inner threaded annular body 41 on the rotating column 40, the hydraulic rod will drive the rotating column 40 to rotate when it moves downward, and the rotating column 40 can only rotate under the action of the upper and lower limit members.

[0032] When conducting a cross-plate shear test, the resistance to the downward movement of the hydraulic rod 60 can be calculated by measuring the liquid pressure in the hydraulic cylinder 31, and the vertical resistance can be converted into the resistance to the rotating column 40 during rotation according to a certain relationship, that is, the resistance to the corresponding T-shaped cross-shear plate 46 during the shearing process. Finally, the resistance during cross-plate shearing can be calculated through the liquid pressure in the hydraulic cylinder 31.

[0033] The steps for using the static penetration probe of the present invention are as follows: Step 1: Installation inspection: Check the tightness of the connections of each component, make sure the cross plate is in the retracted state, make sure the hydraulic rod is at the bottom of the hydraulic cylinder, and calibrate the data and the connectivity and sensitivity of the circuit.

[0034] Step 2: Static penetration test: Conduct conventional static penetration test according to existing specifications and test procedures.

[0035] Step 3, cross-plate shear plate test: first conduct a penetration test, and then conduct a cross-plate shear plate test during the process of recovering the rod. First, adjust the probe to the depth required for the test, and then inject pressure into the elongation hole to drive the T-shaped cross shear plate into the soil. Then, the pressure in the hydraulic cylinder moves the hydraulic rod downward, driving the T-shaped cross shear plate to rotate. At this time, measure the liquid pressure in the hydraulic cylinder and record the resistance encountered during the cross-plate shearing process. After the shearing is completed, inject liquid pressure into the contraction hole to retract the T-shaped cross shear plate.

[0036] Step 4: Recover the instrument and organize the data: After completing the cross-plate shear test at a single depth or multiple depths, retract the probe. After retracting the probe, the hydraulic rod needs to be returned to the initial position.

[0037] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A static penetration probe with cross-plate shearing, characterized in that: It includes a cross plate shear component, a side wall friction component and a conical probe component which are connected in sequence from top to bottom. The cross plate shear component includes an upper limit cap with an upper threaded joint and a base. A tubular hydraulic cylinder is arranged at the center of the upper limit cap. An annular columnar cavity is arranged around the hydraulic cylinder. The upper limit cap is connected to a rotating column. There are four radially annularly distributed cubic cavities inside the rotating column. A T-shaped cross shear plate is placed inside the cubic cavity. The rotating column is connected to the base through the bottom.

2. A static penetration probe with cross plate shearing according to claim 1, characterized in that: The lower part of the upper limit cap includes a limiting groove, the top of the rotating column is provided with an upper limit hook, and the upper limit cap is connected to the upper limit hook of the rotating column through the bottom limiting groove.

3. A static penetration probe with cross plate shearing according to claim 1, characterized in that: An elongated hole is arranged radially inwardly on one side of the cubic cavity, and contraction holes are arranged radially outwardly on both sides of the cubic cavity. An inner threaded annular body is adjacent to the lower part of the elongated hole, and the inner threaded annular body is sleeved on the middle thread.

4. A static penetration probe with cross plate shearing according to claim 1, characterized in that: The outer end of the T-shaped cross shear plate is covered with a cross plate waterproof cover.

5. The static penetration probe with cross plate shearing according to claim 1, characterized in that: Four cylindrical holes which are transparent from top to bottom are spaced apart between the four cubic cavities. An annular lower limit hook is arranged at the bottom of the rotating column. The lower limit hook is connected to the lower limit groove. The rotating column is connected to the base through the lower limit hook at the bottom.

6. A static penetration probe with cross plate shearing according to claim 1, characterized in that: A lower limiting groove is arranged on the top of the base, a columnar cavity buffer chamber is included in the center of the base, lower guide rails are included on both sides of the buffer chamber, and the lower guide rails are connected to the lower guide grooves.

7. A static penetration probe with cross plate shearing according to claim 6, characterized in that: A buffer cavity is arranged outside the buffer chamber, a data channel is opened at the bottom of the buffer cavity, and the base is connected to the side wall friction component through a threaded joint.

8. The static penetration probe with cross plate shearing according to claim 1, characterized in that: A small-diameter circular hole is opened on the upper part of the hydraulic cylinder, a large-diameter circular hole is opened on the bottom, and a hydraulic rod is connected inside the hydraulic cylinder.

9. A static penetration probe with cross plate shearing according to claim 8, characterized in that: Two symmetrical upper guide grooves are arranged on the upper part of the hydraulic rod, and the upper guide grooves are connected to the upper guide rails at the bottom of the hydraulic cylinder.

10. The static penetration probe with cross plate shearing according to claim 8, characterized in that: A middle thread is arranged in the middle of the hydraulic rod, and the middle thread is sleeved in the inner threaded annular body. A lower guide groove is arranged at the bottom of the hydraulic rod and is connected to a lower guide rail in the base.

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