CN214660136U - Single-cavity high-pressure pre-drilling type shearing lateral pressure instrument - Google Patents
Single-cavity high-pressure pre-drilling type shearing lateral pressure instrument Download PDFInfo
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- CN214660136U CN214660136U CN202120074416.3U CN202120074416U CN214660136U CN 214660136 U CN214660136 U CN 214660136U CN 202120074416 U CN202120074416 U CN 202120074416U CN 214660136 U CN214660136 U CN 214660136U
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Abstract
The utility model belongs to the technical field of the geological survey, a single-chamber formula high pressure is bored formula in advance and is sheared lateral pressure appearance is disclosed, including the jacking device, the lateral pressure appearance probe, control system and pipe-line system, the lateral pressure appearance probe includes the core bar, neck bush and rubber membrane, the core bar upper end is equipped with first shaft shoulder and second shaft shoulder in proper order, the core bar lower extreme is equipped with the annular gland, the core bar outside between second shaft shoulder and the annular gland is located to the neck bush cover, and the both ends of neck bush all are equipped with the clamping ring that compresses tightly the rubber membrane, annular gland downside is equipped with fixation nut, core bar periphery cover is equipped with double-deck metal armor, double-deck metal armor's upper end and first shaft shoulder fixed connection, double-deck metal armor's lower extreme and fixation nut laminating, pipe-line system includes the feed liquor pipeline, clearance intercommunication between liquid pipeline and neck bush and the core bar, the neck bush middle part is equipped with the feed liquor through-hole. The utility model discloses can avoid rubber membrane both ends axial to outwards extend after measuring the chamber and adding the high pressure, avoid the rubber membrane to pierce through the rock or cut apart in harder soil layer.
Description
Technical Field
The utility model relates to a geological survey technical field especially relates to a single chamber formula high pressure is bored formula in advance and is cuted side pressure appearance.
Background
The lateral pressure test is one of in-situ test means widely applied in geotechnical engineering and is frequently used in deep stratum investigation. The basic principle is that a drill hole is formed in a test stratum by utilizing a drill rod, a cylindrical lateral pressure device is placed at a designed elevation in the drill hole, the lateral pressure device is pressurized to enable the lateral expansion of the lateral pressure device, a volume-pressure or stress-strain relation curve of the lateral expansion of the drill hole can be obtained according to the reading of the test, and accordingly the lateral pressure or stress-strain relation curve can be used for estimating the bearing capacity of a foundation, measuring the strength parameter, the deformation parameter and the foundation bed coefficient of soil, and estimating the foundation settlement, the bearing capacity of a single pile and the settlement.
The development of the side pressure equipment is started at the end of the last 70 th century in China, and the practical application of the side pressure test, the popularization and the engineering is gradually started in the 80 th century. The existing lateral pressure instrument comprises a pre-drilling type instrument, a self-drilling type instrument and a press-in type instrument, and the pre-drilling type instrument is mainly used at home and abroad. The self-drilling type lateral pressure instrument integrates a lateral pressure instrument device and a drilling machine, a lateral pressure device is arranged on a drilling rod, a drill bit is arranged at the end part of the lateral pressure device, and when the drill bit drills, the cut soil scraps are taken away by slurry from the hollow part of the lateral pressure device (the drilling rod) to a preset elevation and then a lateral pressure test is carried out.
The existing single-cavity type lateral pressure instrument probe, such as the probe in patent CN200971493, because the upper end of the rubber film is parallelly pressed between the upper pipe shoe and the outer drill rod, and the lower end is parallelly pressed between the lower pipe shoe and the outer drill rod, the structure can only ensure sealing when the pressure of the measurement cavity is lower, when the pressure of the measurement cavity is too high, the stress of the rubber film is increased, the deformation is increased, the rubber film is pulled out from between the shoe and the outer drill rod, the rubber film is separated, and the maximum bearing pressure of the measurement cavity is 6 MPa. In addition, the construction results in high manufacturing and installation costs and long time consuming later maintenance. Also like the probe in patent CN108756865A, since the steel sheets bonded on the outer layer in the initial state are combined into a complete ring, when the rubber film expands after pressurization, the steel sheets are pushed to expand in the direction perpendicular to the hole wall, at this time, a larger gap occurs between the steel sheets bonded on the outer layer in the initial state, the rubber film easily flows out from the gap, and the measurement is not accurate at this time.
SUMMERY OF THE UTILITY MODEL
The utility model provides a single chamber formula high pressure is bored formula in advance and is cuted other pressure appearance to solve the problem that the rubber mould breaks away from that easily takes place of current other pressure appearance probe.
In order to achieve the above purpose, the utility model provides a following technical scheme: a single-cavity high-pressure pre-drilling type shearing lateral pressure instrument, which comprises a jacking device, a lateral pressure instrument probe, a control system and a pipeline system, the lateral pressure instrument probe comprises a core bar, an inner bushing and a rubber film, the upper end of the core bar is sequentially provided with a first shaft shoulder and a second shaft shoulder, the lower end of the core rod is in threaded connection with an annular pressure cap, the inner bushing is sleeved on the outer side of the core rod between the second shaft shoulder and the annular pressure sleeve, and both ends of the inner bushing are integrally extended with press rings which respectively press the two ends of the rubber film on the second shaft shoulder and the annular press cap, a fixing nut in threaded connection with the core rod is arranged on the lower side of the annular pressing cap, a double-layer metal armor is sleeved on the periphery of the core rod, the upper end of the double-layer metal armor is fixedly connected with the first shaft shoulder, the lower end of the double-layer metal armor is attached to the fixing nut, and the rubber film corresponding to the outer side of the compression ring is tightly abutted to the double-layer metal armor; the pipeline system comprises a liquid inlet pipeline, the liquid inlet pipeline penetrates through the first shaft shoulder and the second shaft shoulder along the axial direction, the liquid inlet pipeline is communicated with a gap between the inner bushing and the core rod, and a plurality of liquid inlet through holes are circumferentially distributed in the middle of the inner bushing.
During installation, the inner bushing is placed into the rubber membrane, the two ends of the rubber membrane are turned into the inner bushing, then the core rod is pressed in, the upper end of the rubber membrane is pressed between the inner bushing and the second shaft shoulder through the pressing ring at the upper end of the inner bushing, the annular pressing cap is sleeved on the core rod and is tightly abutted to the inner bushing through the fixing nut in threaded connection with the core rod of the side pressing device, meanwhile, the lower end of the rubber membrane is pressed between the inner bushing and the annular pressing cap through the pressing ring at the lower end of the inner bushing, the double-layer metal armor is sleeved in the outermost layer, the upper end of the double-layer metal armor is fixed with the second shaft shoulder, the lower end of the double-layer metal armor is freely sleeved outside the annular pressing cap and the fixing nut, and the upper end and the lower end of the rubber membrane are pressed through the double-layer metal armor.
The technical scheme has the following beneficial effects:
compared with the prior art, the compression ring and the double-layer metal armor of the utility model compress and fix two ends of the rubber membrane, when the pressure of the measurement cavity is too high, the stress of the rubber membrane is increased, and when the deformation is increased, the separation of the rubber membrane is not generated, thereby improving the maximum bearing pressure of the measurement cavity; the outer layer of the double-layer metal armor does not need to be bonded with a steel sheet, so that the double-layer metal armor is convenient to process, manufacture, disassemble and maintain, has better protectiveness for the rubber membrane, the upper end of the rubber membrane is directly connected with the core rod into a whole through threaded connection, the lower end of the rubber membrane can move freely in the axial direction, the expansion deformation process is met, the two ends of the rubber membrane cannot extend outwards in the axial direction in the process of adding over-high pressure, relative displacement does not occur with a probe in the direct shearing process, and the measured experimental data is more accurate.
Preferably, the double-layer metal armor comprises an inner layer metal pipe sleeve and an outer layer metal pipe sleeve which are sleeved with each other, a plurality of gaps are distributed at intervals in the middle of each of the inner layer metal pipe sleeve and the outer layer metal pipe sleeve along the axial direction, and the gaps of the inner layer metal pipe sleeve and the outer layer metal pipe sleeve are staggered with each other.
By the technical scheme, the gaps can enable the double-layer metal armor to expand along with the expansion of the rubber film, in the expansion process, the gaps of the inner-layer metal pipe sleeve are enlarged, and the gaps of the inner-layer metal pipe sleeve and the gaps of the outer-layer metal pipe sleeve are just staggered, so that the soil body is prevented from entering the measuring device to damage the rubber film, and the rubber film is prevented from extruding out of the double-layer protective armor; the ports at the two ends of the inner layer metal pipe sleeve and the outer layer metal pipe sleeve are not cut, and are closed circular rings, so that the rubber film can be prevented from expanding outwards at the two axial ends in the pressurizing process of the measuring cavity.
Preferably, the upper end of the double-layer metal armor is fixedly connected with the first shaft shoulder through a countersunk head screw.
Through the technical scheme, the double-layer metal armor is firmly connected with the core rod.
Preferably, the rubber membrane is made of silicon rubber, and the thickness of the rubber membrane is 3.5 mm.
Through above-mentioned technical scheme, the durability of rubber membrane is good.
Preferably, the jacking device comprises a drill rod, a piston cylinder and a piston rod matched with the piston cylinder, the drill rod is in threaded connection with the piston rod, and the piston rod is in threaded connection with the core rod.
Through above-mentioned technical scheme, the jacking device adopts the piston cylinder, and the pressure source can evenly provide in succession, and the linear relation of deformation and pressure can be more accurate.
Preferably, the lower end of the fixing nut has a taper.
Through above-mentioned technical scheme, prevent to be blocked by rock and other foreign matter when the probe is put into the soil layer.
Drawings
Fig. 1 is a schematic view of a probe structure of a single-cavity high-pressure pre-drilling shear lateral manometer provided in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a double layer metal armor of a lateral pressure instrument probe in an unexpanded state;
figure 3 is a cross-sectional view of a double metal armor of a lateral pressure instrument probe in an expanded state.
Detailed Description
The invention will be described in further detail with reference to the following drawings and embodiments:
reference numerals in the drawings of the specification include: the liquid inlet pipe comprises a liquid inlet pipeline 1, a core rod 2, a sunk screw 3, a double-layer metal armor 4, an inner bushing 5, a rubber membrane 6, a liquid inlet through hole 7, an annular pressing cap 8 and a fixing screw cap 9.
As shown in fig. 1, 2 and 3, a single-cavity high-pressure pre-drilling type shearing side pressure instrument comprises a jacking device, a side pressure instrument probe, a control system and a pipeline system, wherein the side pressure instrument probe comprises a core rod 2, an inner bushing 5 and a rubber film 6, a first shaft shoulder and a second shaft shoulder are integrally formed at the upper end of the core rod 2, the diameter of the first shaft shoulder is larger than that of the second shaft shoulder, an annular pressing cap 8 is arranged at the lower end of the core rod 2, the diameter of the upper part of the annular pressing cap 8 is smaller than that of the lower part of the annular pressing cap, the inner bushing 5 is sleeved on the outer side of the core rod 2 between the second shaft shoulder and the annular pressing sleeve, pressing rings extend integrally from both ends of the inner bushing 5, the pressing rings press both ends of the rubber film 6 on the upper parts of the second shaft shoulder and the annular pressing cap 8 respectively, the rubber film is made of silicon rubber, the thickness of the rubber film is 3.5mm, a fixing nut 9 in threaded connection with the core rod 2 is arranged at the lower side of the annular pressing cap 8, the lower end of the fixing nut 9 has a taper, the periphery of the core rod 2 is sleeved with a double-layer metal armor 4, the upper end of the double-layer metal armor 4 is fixedly connected with the first shaft shoulder through a countersunk screw 3, the lower end of the double-layer metal armor 4 is attached to a fixing nut 9, and a rubber film 6 corresponding to the outer side of the pressing ring is tightly abutted to the double-layer metal armor 4.
The pipeline system comprises a liquid inlet pipeline 1, the liquid inlet pipeline 1 penetrates through a first shaft shoulder and a second shaft shoulder along the axial direction, a gap between the liquid inlet pipeline 1 and an inner bushing 5 and a gap between the inner bushing 5 and a core rod 2 are communicated, and four liquid inlet through holes 7 are circumferentially distributed in the middle of the inner bushing 5 at intervals. The jacking device includes the drilling rod, the piston cylinder and with the supporting piston rod of piston cylinder, 2 threaded connection of piston rod and core bar, drilling rod and piston rod threaded connection, control system includes industrial computer and pressure source, piston cylinder and feed liquor pipeline 1 all with pressure source tube coupling, and arranged control flap and a plurality of pressure sensor on the pipeline, the industrial computer is used for opening and close of control pressure source and control flap, control system, valve and pressure sensor on the pipeline are prior art, do not describe here any more.
The double-layer metal armor 4 comprises an inner layer metal pipe sleeve and an outer layer metal pipe sleeve which are mutually sleeved, ten gaps are distributed at intervals in the middle of the inner layer metal pipe sleeve and the outer layer metal pipe sleeve along the axial direction, and the gaps of the inner layer metal pipe sleeve and the outer layer metal pipe sleeve are mutually staggered and not communicated.
The specific implementation process is as follows: the inner bushing 5 is placed in the rubber membrane 6, two ends of the rubber membrane 6 are both turned inside the inner bushing 5, then the core rod 2 is pressed in, the upper end of the rubber membrane 6 is pressed between the inner bushing 5 and the second shaft shoulder through a pressing ring at the upper end of the inner bushing 5, the annular pressing cap 8 is sleeved on the core rod 2 and tightly abuts against the inner bushing 5 through a fixing nut 9 in threaded connection with the side pressing device core rod 2, meanwhile, the lower end of the rubber membrane 6 is pressed between the inner bushing 5 and the annular pressing cap 8 through the pressing ring at the lower end of the inner bushing 5, the double-layer metal armor 4 is sleeved on the outermost layer, the upper end of the double-layer metal armor 4 is fixed with the second shaft shoulder, the lower end of the double-layer metal armor 4 is freely sleeved outside the annular pressing cap 8 and the fixing nut 9, and the upper end and the lower end of the rubber membrane 6 are pressed through the double-layer metal armor 4.
And (3) side pressure testing:
after a set hole is drilled, the probe of the lateral pressure instrument is arranged at a test elevation position and is pressurized into a measurement cavity of the probe of the lateral pressure instrument, a pressure medium flows into the measurement cavity through a liquid inlet through hole 7, the rubber membrane 6 is driven to radially expand by pressure, the outer double-layer metal armor 4 is pushed to outwardly expand by the radial expansion of the rubber membrane 6, the cavity to be measured is expanded to push the double-layer metal armor 4 to contact with a hole wall and disturb a soil body to recover to a soil pressure value close to the soil pressure value corresponding to an original state, and then the initial pressure can be collected and is gradually pressurized to a plastic pressure and a limit pressure, so that soil mechanics indexes such as a lateral pressure modulus are obtained.
And (3) shear test:
after the side pressure test is finished, the pressure in the measuring cavity is kept, the pressure source provides pressure to a lower cavity of the piston cylinder in an expansion state to generate upward thrust, the pressure is slowly increased until the piston rod drives the side pressure probe to axially move to obtain a peak value of shear stress, the hydraulic pressure of the piston cylinder is monitored on line by the pressure sensor at the moment, the next-stage radial stress is applied, then the corresponding vertical shear stress is applied, and the steps are repeated. And finally, forming a series of relations of radial stress-radial deformation, radial stress-shear stress and shear stress-shear displacement by software.
The above description is only an example of the present invention, and the detailed technical solutions and/or characteristics known in the solutions are not described too much here. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (6)
1. The utility model provides a single chamber formula high pressure is bored formula in advance and is cuted side pressure appearance, includes jacking device, side pressure appearance probe, control system and pipe-line system, its characterized in that: the lateral pressure instrument probe comprises a core bar, an inner bushing and a rubber film, wherein a first shaft shoulder and a second shaft shoulder are sequentially arranged at the upper end of the core bar, an annular pressing cap is arranged at the lower end of the core bar, the inner bushing is sleeved outside the core bar between the second shaft shoulder and the annular pressing cap, pressing rings integrally extend from two ends of the inner bushing, the two ends of the rubber film are respectively pressed on the second shaft shoulder and the annular pressing cap by the pressing rings, a fixing nut in threaded connection with the core bar is arranged at the lower side of the annular pressing cap, a double-layer metal armor is sleeved on the periphery of the core bar, the upper end of the double-layer metal armor is fixedly connected with the first shaft shoulder, the lower end of the double-layer metal armor is attached to the fixing nut, and the rubber film corresponding to the outer side of the pressing ring is tightly abutted to the double-layer metal armor; the pipeline system comprises a liquid inlet pipeline, the liquid inlet pipeline penetrates through the first shaft shoulder and the second shaft shoulder along the axial direction, the liquid inlet pipeline is communicated with a gap between the inner bushing and the core rod, and a plurality of liquid inlet through holes are circumferentially distributed in the middle of the inner bushing.
2. The single-cavity high-pressure pre-drilling shear bystander according to claim 1, wherein: the double-layer metal armor comprises an inner layer metal pipe sleeve and an outer layer metal pipe sleeve which are sleeved with each other, a plurality of gaps are distributed at intervals in the middle of the inner layer metal pipe sleeve and the outer layer metal pipe sleeve along the axial direction, and the gaps of the inner layer metal pipe sleeve and the outer layer metal pipe sleeve are staggered with each other.
3. The single-cavity high-pressure pre-drilling shear bystander according to claim 2, wherein: the upper end of the double-layer metal armor is fixedly connected with the first shaft shoulder through a countersunk screw.
4. The single-cavity high-pressure pre-drilling shear bystander according to claim 2, wherein: the rubber membrane is made of silicon rubber, and the thickness of the rubber membrane is 3.5 mm.
5. The single-cavity high-pressure pre-drilling shear bystander according to claim 2, wherein: the jacking device comprises a drill rod, a piston cylinder and a piston rod matched with the piston cylinder, the drill rod is in threaded connection with the piston rod, and the piston rod is in threaded connection with the core rod.
6. The single-cavity high-pressure pre-drilling shear bystander according to claim 2, wherein: the lower end of the fixing nut is provided with a taper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120074416.3U CN214660136U (en) | 2021-01-12 | 2021-01-12 | Single-cavity high-pressure pre-drilling type shearing lateral pressure instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120074416.3U CN214660136U (en) | 2021-01-12 | 2021-01-12 | Single-cavity high-pressure pre-drilling type shearing lateral pressure instrument |
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| Publication Number | Publication Date |
|---|---|
| CN214660136U true CN214660136U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120074416.3U Active CN214660136U (en) | 2021-01-12 | 2021-01-12 | Single-cavity high-pressure pre-drilling type shearing lateral pressure instrument |
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| CN (1) | CN214660136U (en) |
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2021
- 2021-01-12 CN CN202120074416.3U patent/CN214660136U/en active Active
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