CN109469110B - Rigid connection device for pile and bearing platform for pile foundation model test and assembling method - Google Patents
Rigid connection device for pile and bearing platform for pile foundation model test and assembling method Download PDFInfo
- Publication number
- CN109469110B CN109469110B CN201811227683.9A CN201811227683A CN109469110B CN 109469110 B CN109469110 B CN 109469110B CN 201811227683 A CN201811227683 A CN 201811227683A CN 109469110 B CN109469110 B CN 109469110B
- Authority
- CN
- China
- Prior art keywords
- pile
- sleeve
- connecting plate
- pile top
- top plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a rigid connecting device and an assembling method for a pile and a bearing platform for a pile foundation model test, which comprises a precession device and a measuring system, wherein the precession device comprises a base and a bearing platform; the measuring system comprises a core-through pressure sensor and a data acquisition system; the screw-in device comprises a sleeve, a plug, a connecting plate, a nut and a base; the connecting plate is used as a bearing platform, a through hole is formed in the connecting plate, the sleeve is used as a test pile, threads are respectively arranged on the upper portion and the lower portion of the sleeve, the upper portion of the sleeve is matched with the lower portion of the plug, the lower portion of the sleeve is matched with the base, the upper portion of the plug penetrates through the core penetrating pressure sensor and then is inserted into a hole of the connecting plate, and the top of the plug is matched with the nut to fix the sleeve on the connecting plate; the core-penetrating pressure sensor is connected with a data acquisition system. The invention researches the pile group bearing characteristic in the pile foundation model test and solves the technical problem of how to rigidly connect the pile and the bearing platform.
Description
Technical Field
The invention relates to a rigid connecting device of a pile and a bearing platform for a pile foundation model test and an assembling method thereof.
Background
The pile model test is a test which refers to the actual working state of the pile, establishes a model with a certain similarity rule with a prototype, artificially controls test conditions by means of precise scientific instruments and equipment, and researches the bearing characteristics of the pile under a certain or some specific conditions.
The model pile material should satisfy the following requirements: the rigidity difference between the pile body and the soil body around the pile can be better reflected, and the roughness of the pile-soil contact surface can be properly reflected; the test element is easy to process and arrange. When the model pile is large, a reinforced concrete pile or a steel sheet pile with the same elevation as the prototype can be used as the model pile; for smaller model piles, organic glass, PVC pipes, epoxy resin, steel pipes, sleeves or copper bars and other materials can be used as the model piles. At present, many scholars use a sleeve as a test pile body and a connecting plate as a bearing platform, however, the rigid connection mode of the pile and the bearing platform is a problem which needs to be considered by a tester, if the rigid connection mode is not considered properly, the deviation is easily generated on a prototype, a similar rule is not easy to obtain, and in order to ensure the smooth operation of a test process, the rigid connection device for the pile and the bearing platform for the pile foundation model test is urgently needed to be invented.
Disclosure of Invention
The invention aims to obtain similar rules in a pile foundation model test, and provides a rigid connecting device for a pile and a bearing platform of the pile foundation model test and an assembling method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rigid connection device of a pile and a bearing platform for a pile foundation model test comprises a precession device and a measuring system; the measuring system comprises a core-through pressure sensor and a data acquisition system; the screw-in device comprises a sleeve, a plug, a connecting plate, a nut and a base; the connecting plate is used as a bearing platform, a through hole is formed in the connecting plate, the sleeve is used as a test pile, threads are respectively arranged on the upper portion and the lower portion of the sleeve, the upper portion of the sleeve is matched with the lower portion of the plug, the lower portion of the sleeve is matched with the base, the upper portion of the plug penetrates through the core penetrating pressure sensor and then is inserted into a hole of the connecting plate, and the top of the plug is matched with the nut to fix the sleeve on the connecting plate; the core-penetrating pressure sensor is connected with a data acquisition system.
After all the parts are combined, the whole structure is buried in the corresponding soil body, and model test research of the corresponding pile group bearing characteristics can be carried out. The pile top plug, the core penetrating pressure sensor and the specially-made nut after the test can be conveniently recycled.
The sleeve connecting plate is preferred, the end cap include upper and lower part, two parts are cylindrical, its lower part radius is greater than the upper portion radius, be equipped with the external screw thread in upper portion and lower part.
Preferably, the lower part of the plug is in threaded connection with the sleeve.
Preferably, the upper part of the plug is in threaded connection with the nut.
Preferably, the core-penetrating pressure sensor is arranged at the upper part of the plug and is positioned at the bottom of the connecting plate.
Preferably, the core penetrating sensor can accurately measure the pressure change of the connecting plate, the outer diameter of the core penetrating sensor is the same as that of the sleeve, an enlarged head is avoided, the inner diameter of the core penetrating sensor is the same as that of the middle part of the pile top plug, and therefore the core penetrating sensor can be sleeved together, can slightly slide and cannot be blocked.
Preferably, the middle part of the plug and the inner side surface of the opening of the connecting plate are smooth, so that the plug can slightly slide before being fixed.
Further preferably, the diameters of the upper part and the lower part of the through hole are different, the upper part is formed into a groove shape for placing the nut, and the top of the nut is lower than that of the connecting plate.
Further preferably, the sleeve, the connecting plate, the nut and the pile top plug are all made of aluminum.
The rigid connecting device of the pile and the bearing platform for the pile foundation model test and the assembling method thereof comprise the following steps:
1) selecting a hollow sleeve with a certain size, knurling the periphery of the sleeve at a knurling position by a knurling tool in a professional organization to increase the friction force with a soil body, and arranging an internal thread with the length of 20mm on the inner side of the upper part of the sleeve;
2) through holes are formed in different positions of the connecting plate, and the diameters of the upper position and the lower position of each through hole are different, so that accurate machining on a special lathe is guaranteed;
3) processing a certain number of pile top plugs, wherein the lower parts of the plugs are provided with external wires with certain lengths, and the whole pile top plug is provided with a through round hole;
4) processing nuts with the same quantity and specific size, wherein the nuts are provided with two small round holes so as to be screwed by a tool;
5) screwing a pile top plug into the hollow sleeve obtained in the step 1), and sleeving a core-penetrating pressure sensor into the pile top plug;
6) sleeving a connecting plate with an opening above a pile top plug, and tightly fixing the connecting plate by using a special nut;
7) after all the parts are combined, the whole structure is buried in the corresponding soil body, and model test research of the corresponding pile group bearing characteristics can be carried out.
Preferably, in the step 3), the length of the external thread arranged at the lower part of the pile top plug is 20 mm.
Preferably, in the step 3), a through round hole is formed in the pile top plug so as to collect data of pile end displacement.
Preferably, in the step 7), the special nut is screwed to ensure that the upper part and the lower part of the core penetrating pressure sensor are compressed, so that an accurate pressure value can be measured.
Preferably, in step 7), the screwing process should ensure verticality without inclination.
And after the test is finished, recovering the pile top plug, the core penetrating pressure sensor and the special nut.
The invention researches the bearing characteristic of pile group in the pile foundation model test, solves the technical problem of how to rigidly connect the pile and the bearing platform, adopts the specially-made pile top plug to complete the combination process, thereby ensuring the smooth proceeding of the test.
The invention has the beneficial effects that:
1. the pile top plug can realize rigid connection between a pile and a bearing platform, a core-penetrating pressure sensor arranged between the pile top plug and the bearing platform can accurately acquire the numerical value of pile top force, and the pile top plug is provided with a round hole to acquire displacement data of a pile end;
2. the core-through pressure sensor has the advantages of simple structure, small volume, light dead weight, convenient installation, high output sensitivity, good linearity, stability and repeatability.
3. The device has the advantages of simple structure, convenience in assembly, easiness in operation, lightness, flexibility and capability of reducing the test cost to a certain extent;
4. the pile top plug and the specially-made nut are made of aluminum materials, are convenient to install, and have the advantages of high and low temperature resistance, light weight and convenience in wire opening.
5. The pile top plug, the core penetrating pressure sensor and the specially-made nut after the test can be conveniently recycled.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of a rigid connection of a pile and a cap for pile foundation model testing;
FIG. 2 is a three-dimensional schematic view of a cannula;
FIG. 3 is a three-dimensional schematic view of a pile top plug;
FIG. 4 is a three-dimensional schematic view of a nut;
FIG. 5 is a three-dimensional schematic view of a feedthrough pressure sensor;
wherein, 1, a sleeve; 2. a pile top plug; 3. a feed-through pressure sensor; 4. a nut; 5. a connecting plate.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up" and "down" in the present application, if any, are used merely to indicate correspondence with the directions of the upper and lower portions of the drawings, and are not intended to limit the structure, but merely to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or components so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
As described in the background art, at present, many scholars use a sleeve as a test pile body and a connecting plate as a bearing platform, however, the rigid connection mode of the pile and the bearing platform is a problem that needs to be considered by a tester, if the rigid connection mode is not considered properly, the prototype is easy to shift, a similar rule is not easy to obtain, and in order to ensure the smooth proceeding of the test process, the rigid connection device of the pile and the bearing platform for the pile foundation model test is urgently needed to be invented.
In an exemplary embodiment of the present application, as shown in fig. 1, a rigid connection device for a pile and a cap for a pile foundation model test, includes a precession device and a measuring system,
wherein, precession device is including the sleeve pipe 1, pile bolck end cap 2, the trompil connecting plate 5, the nut 4 of the inboard area silk that connect gradually, and measurement system includes cross core pressure sensor 3, data acquisition system. One end of the pile top plug 2 is connected with one side with the wire of the sleeve 1, the other end is sleeved with the perforated connecting plate 5 after the core-penetrating pressure sensor 3 is placed, and the pile top plug is fixed at the set position of the perforated connecting plate 5 through a nut 4 with a special size. The feed-through pressure sensor 3 is connected to a dedicated data acquisition system. After all the parts are combined, the whole structure is buried in the corresponding soil body, and model test research of the corresponding pile group bearing characteristics can be carried out.
The sleeve 1, the through-core sensor 3 and the hole connecting plate 5 are sequentially connected through a pile top plug 2.
The purpose of the pile top plug is to achieve a rigid connection between the casing and the connecting plate and to arrange a pressure sensor therebetween in order to measure the pile top reaction force.
Preferably, the sleeve 1, the connecting plate 5, the nut 4 and the pile top plug 2 are made of aluminum. The installation is convenient, and has high low temperature resistant, the quality is light and the convenient advantage of opening the silk.
The lower end of the pile top plug 2 and the inner side of the sleeve are respectively provided with an outer wire and an inner wire, so that the outer wire and the inner wire can be connected in a matched mode, and the lengths of the inner wire and the outer wire are the same and are 20 mm. The uppermost end of the pile top plug is provided with an external thread with a certain length, so that the external thread can be screwed with a nut with a special size.
Preferably, the core penetrating sensor can accurately measure pressure change, the outer diameter of the core penetrating sensor is the same as that of the aluminum pipe, expansion heads are avoided, the inner diameter of the core penetrating sensor is the same as that of the middle part of the pile top plug, and therefore the core penetrating sensor can be sleeved together, can slightly slide and cannot be blocked.
Preferably, the core-through pressure sensor is made of high-strength spring steel or high-elasticity aluminum alloy, is specially processed and formed, is strictly adhered and protected and bridged by using a high-precision self-compensation adhesive metal resistance strain gauge as a sensitive element, is connected with a data acquisition system, and can automatically acquire a stress value through a special software function. The structure is simple, the volume is small, the dead weight is light, the installation is very convenient, the output sensitivity is high, and the linearity, the stability and the repeatability are good. The measuring range is 2t, the precision is 0.1 percent, and the opening is convenient for leading out a pile end displacement measuring screw rod; the exterior structure of the sensor is shown in fig. 5;
the nuts are used for fixing the pile top plugs at the set positions of the connecting plate, so that the core penetrating pressure sensor is pressed up and down; the external structure of the nut is as shown in fig. 4, the external surface of the nut is cylindrical, and after the nut is installed on the pile top plug 2, the top surface of the nut is lower than the top surface of the connecting plate 5 or is flush with the top surface of the connecting plate 5; so as not to generate a bulge.
As shown in fig. 3, the middle of the pile top plug 2 and the inside surface of the web opening are smooth to ensure a slight sliding before being fixed. Preferably, the diameter of the middle part of the pile top plug and the diameter of the hole formed in the lower part of the connecting plate are both 15 mm.
Preferably, the pile top plug is provided with a round hole so as to collect the displacement data of the pile end.
Preferably, the diameter of the upper part of the through hole of the connecting plate is larger than that of the lower part, a groove is formed in the upper part, and a nut with a special size can be placed in the groove, so that the protrusion is avoided.
The rigid connection device of pile and bearing platform for pile foundation model test and its assembling method includes the following steps:
1) selecting a hollow sleeve 1 with a certain size, knurling the periphery of the sleeve at a knurling position by a knurling tool in a professional organization to increase the friction force with a soil body, and arranging an internal thread with the length of 20mm on the inner side of the upper part of the sleeve 1;
2) holes are formed in different positions of the connecting plate 5, and the diameters of the upper position and the lower position of each hole are different, so that accurate machining on a special lathe is guaranteed;
3) processing a certain number of pile top plugs 2, wherein the lower parts of the plugs 2 are provided with external wires with certain lengths, and the whole pile top plug 2 is provided with a through round hole;
4) processing nuts 4 with the same quantity and specific size, wherein two small round holes are formed in the nuts 4 so as to be screwed by a special tool;
5) a certain number of core-penetrating pressure sensors 3 with corresponding sizes are customized;
6) screwing the pile top plug 2 into the hollow sleeve 1 obtained in the step 1), and sleeving the core-penetrating pressure sensor 3 into the pile top plug 2;
7) sleeving a connecting plate 5 with an opening above the pile top plug 2, and tightly fixing the connecting plate with a special nut 4;
8) after all the parts are combined, the whole structure is buried in a corresponding soil body, and then model test research of corresponding pile group bearing characteristics can be carried out;
9) a recovery pile top plug 2, a core-penetrating pressure sensor 3 and a special nut 4.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive faculty, based on the technical solutions of the present invention.
Claims (3)
1. A rigid connection device of a pile and a bearing platform for a pile foundation model test is characterized by comprising a precession device and a measuring system; the measuring system comprises a core-through pressure sensor and a data acquisition system; the precession device comprises a sleeve, a pile top plug, a connecting plate, a nut and a base; the connecting plate is used as a bearing platform, a through hole is formed in the connecting plate, the sleeve is used as a test pile, threads are respectively arranged on the upper portion and the lower portion of the sleeve, the upper portion of the sleeve is matched with the lower portion of a pile top plug, the lower portion of the sleeve is matched with a base, the upper portion of the plug penetrates through the core penetrating pressure sensor and then is inserted into the through hole of the connecting plate, and the top of the plug is matched with the nut to realize the fixation of the sleeve on the connecting plate; the core-penetrating pressure sensor is connected with a data acquisition system; the core-penetrating pressure sensor is arranged at the upper part of the pile top plug and is positioned at the bottom of the connecting plate;
the middle part of the pile top plug and the inner side surface of the opening of the connecting plate are smooth, so that slight sliding can be ensured before the pile top plug is not fixed;
the diameters of the upper part and the lower part of the through hole are different, the upper part of the through hole is in a groove shape and used for placing the nut, and the top of the nut is lower than that of the connecting plate; the pile top plug comprises an upper part and a lower part, wherein the two parts are cylindrical, the radius of the lower part of the two parts is larger than that of the upper part of the two parts, outer rings of the upper part and the lower part of the two parts are provided with external threads, and a through hole is formed in the two parts; the lower part of the pile top plug is connected with the sleeve through threads; the upper part of the pile top plug is connected with the nut through threads; the core penetrating pressure sensor can accurately measure the pressure change, the outer diameter of the core penetrating pressure sensor is the same as that of the sleeve, and the inner diameter of the core penetrating pressure sensor is the same as that of the middle part of the pile top plug; the pile top plug is provided with a round hole.
2. The apparatus according to claim 1, wherein the sleeve, the connecting plate, the nut and the pile top plug are made of aluminum.
3. A method of assembling a rigid connection of a pile and a cap for pile foundation model testing according to any one of claims 1 to 2, comprising the steps of:
1) selecting a hollow sleeve with a certain size, knurling the periphery of the sleeve by a knurling tool in a professional organization to increase the friction force with a soil body, and arranging an internal thread on the inner side of the upper part of the sleeve;
2) through holes are formed in different positions of the connecting plate, and the diameters of the upper part and the lower part of each through hole are different, so that accurate machining on a special lathe is guaranteed;
3) processing a certain number of pile top plugs, wherein the lower parts of the pile top plugs are provided with external wires with certain lengths, and the whole pile top plug is provided with a through round hole;
4) processing nuts with the same quantity and specific size, and forming two small round holes on the nuts so as to facilitate screwing;
5) screwing a pile top plug into the hollow sleeve obtained in the step 1), and sleeving a core-penetrating pressure sensor into the pile top plug;
6) sleeving the upper part of the pile top plug into the perforated connecting plate, and tightly fixing the connecting plate by using a nut; the core penetrating pressure sensor is guaranteed to be compressed up and down, so that accurate pressure values can be measured; the perpendicularity is ensured in the screwing process, and the inclination cannot be caused;
7) after all the parts are combined, the whole structure is buried in the corresponding soil body, and model test research of the corresponding pile group bearing characteristics can be carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811227683.9A CN109469110B (en) | 2018-10-22 | 2018-10-22 | Rigid connection device for pile and bearing platform for pile foundation model test and assembling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811227683.9A CN109469110B (en) | 2018-10-22 | 2018-10-22 | Rigid connection device for pile and bearing platform for pile foundation model test and assembling method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109469110A CN109469110A (en) | 2019-03-15 |
| CN109469110B true CN109469110B (en) | 2021-12-28 |
Family
ID=65665848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811227683.9A Active CN109469110B (en) | 2018-10-22 | 2018-10-22 | Rigid connection device for pile and bearing platform for pile foundation model test and assembling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109469110B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600998A (en) * | 2003-09-26 | 2005-03-30 | 中国科学院武汉岩土力学研究所 | Model test equipment for unsaturated earth pile base |
| JP2006057380A (en) * | 2004-08-23 | 2006-03-02 | Takenaka Komuten Co Ltd | Load testing method for piled raft foundation |
| CN103558044A (en) * | 2013-11-05 | 2014-02-05 | 上海理工大学 | Indoor model testing apparatus for analyzing influences of shield tunnel grouting construction on adjacent pile foundations |
| CN204326121U (en) * | 2014-12-06 | 2015-05-13 | 国家电网公司 | For the experimental rig of transmission line foundation test |
| CN204849855U (en) * | 2015-07-29 | 2015-12-09 | 武汉科技大学 | Clump of piles field test's model device |
| CN205712223U (en) * | 2016-04-28 | 2016-11-23 | 上海理工大学 | A kind of model pile tube test connecting device |
-
2018
- 2018-10-22 CN CN201811227683.9A patent/CN109469110B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600998A (en) * | 2003-09-26 | 2005-03-30 | 中国科学院武汉岩土力学研究所 | Model test equipment for unsaturated earth pile base |
| JP2006057380A (en) * | 2004-08-23 | 2006-03-02 | Takenaka Komuten Co Ltd | Load testing method for piled raft foundation |
| CN103558044A (en) * | 2013-11-05 | 2014-02-05 | 上海理工大学 | Indoor model testing apparatus for analyzing influences of shield tunnel grouting construction on adjacent pile foundations |
| CN204326121U (en) * | 2014-12-06 | 2015-05-13 | 国家电网公司 | For the experimental rig of transmission line foundation test |
| CN204849855U (en) * | 2015-07-29 | 2015-12-09 | 武汉科技大学 | Clump of piles field test's model device |
| CN205712223U (en) * | 2016-04-28 | 2016-11-23 | 上海理工大学 | A kind of model pile tube test connecting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109469110A (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107725026B (en) | Rock-soil geologic body drilling deformation testing device and testing method thereof | |
| CN202170792U (en) | Measuring device of radial deformation of well hole | |
| CN104215219B (en) | Magnetostriction hydrostatic level and measuring method thereof in high precision | |
| CN200989768Y (en) | Non-vertical end face hole depth measuring tool | |
| CN109469110B (en) | Rigid connection device for pile and bearing platform for pile foundation model test and assembling method | |
| CN110608826A (en) | Device for dynamically measuring real-time stress of motor | |
| CN106840019B (en) | Sensitivity test system for borehole strain gauge | |
| CN109693813B (en) | Ground simulation pay-off of compatible many specifications spool | |
| CN114993162A (en) | Device and method for measuring circumferential strain and axial stress of grouting material | |
| CN103900512B (en) | Micrometric displacement marking apparatus and using method thereof | |
| CN205482705U (en) | Displacement generator | |
| CN112525727B (en) | Testing device for shear deformation of concrete member core area and mounting and testing method | |
| CN210774451U (en) | Device for dynamically measuring real-time stress of motor | |
| CN209820382U (en) | Long tube inner hole size gauge | |
| CN104236446A (en) | Drilling multi-component strain measurement head | |
| CN210036541U (en) | Quick detection device of automobile engine valve spring | |
| CN105781526B (en) | Stress testing device and stress testing method for tubular column of water injection well | |
| CN207991599U (en) | The underground acquisition component of power and speed signal in standard penetration test (SPT) | |
| CN219455025U (en) | Measuring device for crack width change of underground masonry cultural relics | |
| CN220136217U (en) | Inspection well height measuring tool | |
| CN205014938U (en) | Adhere to formula relative displacement sensor | |
| CN212645601U (en) | Measuring device for diameter of inner taper hole of slender pipe | |
| CN219431818U (en) | Small-size is along with boring directional measurement probe verification appurtenance | |
| CN210400663U (en) | Rubber fork type triaxial strain gauge cable connecting device and triaxial strain gauge | |
| CN111395961B (en) | Integral tensile simulation experiment device and method for deepwater surface conduit feeding tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |