CN207498925U - A kind of dynamic penetrometer - Google Patents
A kind of dynamic penetrometer Download PDFInfo
- Publication number
- CN207498925U CN207498925U CN201721123287.2U CN201721123287U CN207498925U CN 207498925 U CN207498925 U CN 207498925U CN 201721123287 U CN201721123287 U CN 201721123287U CN 207498925 U CN207498925 U CN 207498925U
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- Prior art keywords
- hammer
- tube body
- spring
- pawl
- hammer body
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Abstract
The utility model discloses a kind of dynamic penetrometers,Including tube body,Pallet,Hammer body and the first spring,Pallet is arranged on one end of tube body,Hammer body is arranged on the inside of tube body towards one end of pallet,And for being moved on the length direction of tube body,First spring is set to the inside of tube body,One end of first spring is connected with tube body,The other end is connected with hammer body,For applying elastic force to hammer body,By one end that hammer body is equipped with to pallet by moving to tube body at the top of tube body,Hammer body is located at bottom and is hammered during hammering,Avoid security risk hammer body being lifted on above aperture,Simultaneously by setting the first spring in tube body,So that hammer body has obtained the elastic force of spring application during hammering,In one timing of strength of hammering,The quality needed for hammer body is reduced by the elastic force of spring,And can different size of elastic force be applied to hammer body according to the length of spring contraction,Different size of hammer force is obtained in the case where hammer body quality is certain.
Description
Technical field
The utility model is related to geotechnical engineering investigation equipment technical field, more particularly to a kind of dynamic penetrometer.
Background technology
In engineering investigation activity, need to carry out soil layer mechanics layering by dynamic penetration test, and determine soil layer
Physico-mechanical properties make foundation soil Engineering Geology Evaluation, and common dynamic penetration test has in engineering investigation at present：Mark
Quasi- penetration test (SPT) and circular cone dynamic sounding experiment (DPT).Circular cone dynamic sounding experiment be divided into for：It is light-duty, heavy and overweight
Type dynamic penetration test, is a kind of conventional and ripe home position testing method of engineering geological investigation, and various testing equipments have
The corresponding scope of application, standard penetration test (SPT) probe is different from other two kinds experiments, and test type and specification are such as shown in Table 1.
Table 1
By table 1 record standard penetration test (SPT) it can be seen from data (SPT) and circular cone dynamic sounding experiment (DPT) hammer weight,
It falls away from different, wherein heavy dynamic penetration test experiment, the experiment of superduty circular cone dynamic sounding and standard penetration test (SPT)
It is had the following disadvantages during soil investigation：
1st, experiment needs to configure two kinds of hammer bodies and three sets of drilling rods, and the quality of hammer body is larger, in the transport, installation and examination of equipment
Test operation in operate it is very inconvenient；
2nd, three kinds of experiments, which are required to drop hammer, is placed in above aperture, and free-falling is realized by automatic decoupling device, due to
Drilling rod length above ground level is difficult to control within 1.5m, therefore security risk during lifting is more prominent, becomes driller
Important safety risk sources in work.
Utility model content
For this reason, it may be necessary to provide a kind of dynamic penetrometer, by the way that hammer body is arranged on feeler lever bottom, hammer body is prevented on feeler lever top
Hammer body falling risk caused by portion carries out hammering operation, and increased in a manner that energizing spring is set in feeler lever for hammer body and visited
The impact force that wiper hammer is hit, for reducing hammer body size or compensating the impact force of hammer body.
To achieve the above object, a kind of dynamic penetrometer is inventor provided, including tube body, pallet, hammer body and the first bullet
Spring；
The pallet is set to the bottom end of tube body；
The hammer body is set to tubular body, and can be slided along the length direction of tube body, for applying impact force to pallet；
First spring is set to the inside of tube body, and one end of the first spring is connected with tube body, the other end and hammer body
It is connected, for increasing the impact force of hammer body.
The prior art is different from, above-mentioned technical proposal has the following advantages that：By by hammer body by moving to pipe at the top of tube body
Body is equipped with one end of pallet, and hammer body is located at bottom and is hammered during hammering, avoids hammer body being lifted on aperture
The security risk of top, while by setting the first spring in tube body so that hammer body has obtained spring during hammering and has applied
The elastic force added in one timing of strength of hammering, reduces the quality needed for hammer body by the elastic force of spring, reduces the hammer body of quality just
In transportation, installation and use, and can different size of elastic force be applied to hammer body according to the length of spring contraction, in hammer body quality one
Different size of hammer force is obtained in the case of fixed, avoids the need for the inconvenience of a variety of quality hammer bodies.
Further, the contact surface of the hammer body and tube body is equipped with straight slot, and at least one end of the first spring is set to logical
In slot.
By setting straight slot on the contact surface of hammer body and tube body, one end of the first spring is sheathed on hammer body and is connect with tube body
In the straight slot set in contacting surface, the length of the first spring is enable to extend, and during spring contraction, spring is located in straight slot
Part shrink when be able to be positioned by straight slot.
Further, further include and grab hammer device, the hammer device of grabbing includes pull rod and grabs hammer pawl, one end of pull rod be used for
Power input device is connected；The other end that hammer pawl is articulated with pull rod is grabbed, for grasping hammer body.
Hammer device is grabbed by setting, is able to during hammering grasp hammer body by pull rod, hammer body is lifted.
Further, further include second spring, the top for grabbing hammer pawl extends to above hinged place, one end of second spring with
Pull rod is connected, and the other end is connected with the grabbing hammer pawl above hinged place, makes to grab hammer pawl and firmly grasps hammer body.
Extended at the top of hammer pawl by that will grab, second spring is connected to pull rod and grabs the extension above hammer pawl hinged place
Position is able to during hammer pawl grasping hammer body is grabbed, grab one end of hammer pawl grasping hammer body by the spring for grabbing the hammer pawl other end
Elastic force is tightened, and prevents from grabbing hammer pawl and slip phenomenon occurs during hammer body is grasped.
Further, tripping gear is further included, the tripping gear is connected on the inside of tube body, and is set to and is grabbed on hammer pawl
Side, tripping gear bottom are equipped with conical socket, and the bottom section area of groove is more than top cross-section area, for making to grab hammer pawl top
Portion enters groove, makes to grab hammer pawl disengaging hammer body.
By setting tripping gear, hammer pawl is grabbed during lifting, the upper section for grabbing hammer pawl enters the cone of tripping gear
It in connected in star, grabs and is tightened in groove to pull rod direction at the top of hammer pawl, grab hammer pawl bottom and open, make to grab hammer pawl and loosen hammer body, hammer into shape
Body falls with spring and is hammered, and reduces the resistance when connecting rod being connect with hammer body follows the hammer body to be fallen.
Further, the quantity for grabbing hammer pawl is two or more.
By the way that the quantity for grabbing hammer pawl is set as more than two, hammer body is more steadily grasped convenient for grabbing hammer pawl.
Further, unidirectional mobile device is further included, the unidirectional mobile device includes rack and pawl, and the rack erects
It is straight to set, it is in contact at the top of bottom and tube body, pawl is articulated on pipe body support, and is in contact with the tooth on rack, is used for
Tube body is driven to do one-way movement downwards.
By setting unidirectional mobile device, downward one-way movement is done with carry-over bar by pawl, prevents hammer body in pull-up
During, tube body follows hammer body upward sliding, causes the failure of experiment.
Further, displacement sensor is further included, institute's displacement sensors are set on pipe body support, and be connected with tube body
It connects, for detecting the settling height of tube body.
By setting displacement sensor on pipe body support, the dropping distance of tube body is detected, further improves pipe
The accuracy of detection of body settling height.
Further, the bottom of the pallet is equipped with screw rod.
By setting screw rod in the bottom of pallet, edge assembles the cone of feeler lever bottom by screw rod, while convenient for cone
Replacement after use.
Further, compression bar and compression bar connector are further included, is connected at the top of the compression bar connector and tube body, compression bar connector
Top is equipped with protrusion, and the bottom of compression bar is connected by the protrusion of compression bar connector with tube body.
By setting compression bar and compression bar connector, when tube body sedimentation depth is more than tube length, tube body can be connect by compression bar
Head addition compression bar, lengthens the length of tube body, ensures the body of rod by way of adding compression bar in tube length deficiency
Length.
Description of the drawings
Fig. 1 is the tube body cross-sectional view of dynamic penetrometer in the utility model embodiment；
Fig. 2 is the thin portion structure diagram of hammer body in the utility model embodiment；
Fig. 3 is the A-A cross-sectional views of hammer body in the utility model embodiment；
Fig. 4 is the thin portion structure diagram that hammer pawl is grabbed in the utility model embodiment；
Fig. 5 is the thin portion structure diagram of compression bar in the utility model embodiment；
Fig. 6 is the structure diagram of the utility model embodiment middle pipe body support frame.
Reference sign：
101st, tube body；102nd, pallet；1021st, screw rod；103rd, hammer body；1031st, straight slot；
104th, the first spring；105th, locating piece；106th, spring conductor rod；
201st, pull rod；202nd, hammer pawl is grabbed；203rd, second spring；204th, tripping gear；
2041st, groove；205th, marine riser；206th, sling；
301st, compression bar；302nd, compression bar connector；303rd, partition board；
401st, pipe body support；402nd, rack；403rd, pawl；404th, displacement sensor；
405th, pulling force sensor；406th, datum plate.
Specific embodiment
For the technology contents of the utility model, construction feature, the objects and the effects are described in detail, below in conjunction with implementation
Mode simultaneously coordinates attached drawing to be explained in detail.
Also referring to Fig. 1 to Fig. 6, Fig. 1 is that the tube body cross-section structure of dynamic penetrometer in the utility model embodiment shows
It is intended to, pallet 102 is arranged on the bottom of tube body 101, and screw rod 1021 is connected to the bottom of pallet 102.Hammer body 103 is arranged on tube body
In 101, and it is arranged on the top of pallet 102.Pull rod 201 is set in tube body 101, and is arranged on the top of hammer body 103.Grab hammer
Pawl 202 be articulated with 201 bottom of pull rod (grabbed in the present embodiment hammer pawl quantity select 3, also can be selected 2 and above grab hammer
Pawl), tripping gear 204 is set to the top for grabbing hammer pawl 202, and is connected to the inside of tube body 101.Marine riser 205 is sheathed on de-
On the pull rod 201 of 204 top of hook device, sling 206 is set to the top of pull rod 201, the top of compression bar connector 302 and tube body 101
Portion is connected.Referring to Fig. 2, Fig. 2 is the thin portion structure diagram of hammer body in the utility model embodiment, the first spring 104
One end is connected with hammer body 103, and the other end is connected with locating piece 105, and (locating piece is fixed on pipe by nail in the present embodiment
In part, one end of the first spring is connected with locating piece, and in certain embodiments, one end of the first spring can be between locating piece
If at regular intervals, the first spring is prevented for a long time in stress).Spring conductor rod 106 is set in the first spring 104
Interior, one end is connected with hammer body 103, and the other end is connected with through-hole preset on locating piece 105.Referring to Fig. 3, Fig. 3 is this
The A-A cross-sectional views of hammer body in utility model embodiment are equipped with multiple straight slots 1031 around the side of hammer body 103, lead to
The size of slot 1031 is adapted with the size of the first spring 104, the first spring 104 and spring conductor rod 106 is set and straight slot
In 1031.Referring to Fig. 4, Fig. 4 is the thin portion structure diagram that hammer pawl is grabbed in the utility model embodiment, grab in hammer pawl 202
Portion is articulated with the bottom of pull rod 201, and one end of second spring 203 is connected with grabbing the part above 202 hinged place of hammer pawl, another
End is connected with pull rod 201 and (is equipped with protrusion in the present embodiment at the top of hammer body, protrusion is equipped with the groove for grabbing hammer pawl grasping).
The bottom of tripping gear 204 is equipped with groove 2041, and the bottom section size of groove 2041 is more than top cross-section size.Please refer to figure
5, Fig. 5 thin portion structure diagram for compression bar in the utility model embodiment, compression bar 301 are connected to pipe by compression bar connector 302
(bottom of compression bar connector is equipped with groove in the present embodiment, and the bottom of compression bar connector is equipped with and compression bar bottom groove for the top of body 101
The protrusion being adapted, compression bar connector inside are equipped with through-hole), partition board 303 is set in compression bar 301, and (compression bar is pipe in the present embodiment
Shape structure, compression bar connector and partition board are equipped with through-hole, for passing through the pull rod of connecting power device or rope).Please refer to figure
6, Fig. 6 be the structure diagram of the utility model embodiment middle pipe body support frame, and pipe body support 401 is set on ground, rack 402
It is disposed longitudinally on pipe body support 401, pawl 403 is assemblied on pipe body support 401, and is adapted with rack 402, rack 402
Bottom is in contact by datum plate 406 with tube body 101, and displacement sensor 404 is arranged on pipe body support 401, one end and benchmark
Plate 406 is in contact.The top of pull rod 201 is equipped with sling 206, and pull rod 201 connects rope by sling 206, and rope is filled with power
Put and be connected that (power input device selects hoist engine in the present embodiment, and hoist engine is assemblied on pipe body support, passes through hoist engine
Spool rotation drives hammer body), pulling force sensor 405 is arranged on rope.
According to above structure, when carrying out standard penetration test (SPT), one end of standard penetrometer and the screw thread phase of bottom
Connection, and tube body and standard penetrometer are vertically arranged, the other end of tube body is made to be put into the bottom hole for treating gaging hole, is set at the top of tube body
Datum plate is put, is in contact at the top of datum plate with rack, power plant is connected by rope with the pull rod in tube body, power plant
First passing through rope drives pull rod to move down, and be set to pull rod bottom grabs what is set in hammer pawl one end grasping hammer body top bump
Hammer body is pulled upwardly by groove, and during grabbing hammer pawl and being pulled upwardly hammer body, the pawl set on pipe body support supports tooth
Item, rack position datum plate, prevent tube body from hammer body being followed to move up, the other end top that second spring will grab hammer pawl
It rises, the one end for making to grab hammer pawl grasping hammer body is compacted in groove, prevents from grabbing hammer pawl and hammer body cunning occurs during hammer body is grasped
The phenomenon that de-, simultaneously, both ends connect the first spring contraction of hammer body and locating piece respectively, and in the straight slot and spring of hammer body
It is positioned under the action of guide rod, prevents the first spring distortion, spring conductor rod follows hammer body to move up and in locating piece
It is slided in upper preset through-hole, when grabbing hammer pawl and being moved to the position of tripping gear, grabs and enter the recessed of tripping gear at the top of hammer pawl
In slot, and to be drawn close in groove to pull rod axis direction, the one end for grabbing hammer pawl grasping hammer body is opened, and hammer body disengaging is made to grab hammer pawl,
When hammer body falls, the elastic force of spring synthesizes the impact force of hammer body with the strength of hammer body free-falling, and impact force is by being fixed on pipe
The pallet of body bottom earthward transmits, and standard penetrometer will be squeezed into the soil body of bottom hole, and marine riser is coated on pull rod positioned at de-
Part above hook device, top are connected with tube body, and pull rod is coated in pull rod telescopic process, prevent above tube body due to rain
It or underground water leak into tube body, and pass through pull rod and penetrate into bottom across the position of tripping gear, influence the hammering of hammer body
Journey, for tube body in sinking watching, datum plate follows tube body to move down, and keeps being in horizontality at the top of tube body, rack is downward
Continue after movement by pawl locking, displacement sensor measures the slippage of datum plate, that is, measures tube body and Standard piercing
Device hit after deflection, when the depth of tube body sedimentation is deeper, carried out pair by compression bar connector and compression bar bottom at the top of tube body
Connect, stretched into the hollow structure of compression bar at the top of rope and pull rod, rope one end is connected by sling with pull rod, the other end wear every
The through-hole of plate and datum plate is connected with power plant, the mobile progress of the through-hole of partition board to rope in compression bar on vertical direction
Limitation, datum plate are positioned over the top of compression bar, and pulling force sensor is connected on rope, and the pulling force of rope is detected, and judge
Whether cone penetrometer is working normally.
When carrying out circular cone dynamic sounding experiment, tube body is vertically arranged, and is erected on pipe body support, tube body is equipped with
Ground to be measured is placed downwards in one end of pallet, and cone is assembled to pallet bottom by screw rod, and bottom is made to form taper knot
Setting datum plate at the top of structure tube body, datum plate top are in contact with rack, and power plant passes through rope and the pull rod phase in tube body
Connection, power plant first pass through rope and pull rod are driven to move down, and be set to pull rod bottom grabs hammer pawl one end grasping hammer body top
The groove set in portion's protrusion, hammer body is pulled upwardly, and during grabbing hammer pawl and being pulled upwardly hammer body, is set on pipe body support
Pawl support rack, rack positions datum plate, prevents tube body from hammer body being followed to move up, second spring will grab hammer pawl
The other end jack up, the one end for making to grab hammer pawl grasping hammer body is compacted in groove, prevents from grabbing hammer pawl during hammer body is grasped
There is the phenomenon that hammer body slips, simultaneously, both ends connect the first spring contraction of hammer body and locating piece respectively, and in hammer body
It is positioned under the action of straight slot and spring conductor rod, prevents the first spring distortion, spring conductor rod follows hammer body to move up
And slide in preset through-hole on the positioning element, when grabbing hammer pawl and being moved to the position of tripping gear, grab enter at the top of hammer pawl it is de-
It in the groove of hook device, and is drawn close in groove to pull rod axis direction, the one end for grabbing hammer pawl grasping hammer body is opened, and takes off hammer body
From hammer pawl is grabbed, when hammer body falls, the elastic force of spring synthesizes the impact force of hammer body with the strength of hammer body free-falling, and impact force passes through
The pallet for being fixed on bottom earthward transmits, while tube body is earthward squeezed into, and marine riser is coated on pull rod and is located at unhook
Part above device, top are connected with tube body, and pull rod is coated in pull rod telescopic process, prevent above tube body due to the rainy day
Or underground water leaks into tube body, and passes through pull rod and penetrate into bottom across the position of tripping gear, influences the hammering process of hammer body,
For tube body in sinking watching, datum plate follows tube body to move down, and keeps moving down in horizontality, rack at the top of tube body
After continue by pawl locking, displacement sensor measures the slippage of datum plate, that is, measure tube body hit after deflection,
When the depth of tube body sedimentation is deeper, docked at the top of tube body by compression bar connector with compression bar bottom, at the top of rope and pull rod
It stretches into the hollow structure of compression bar, rope one end is connected by sling with pull rod, and the other end wears the through-hole of partition board and datum plate
It is connected with power plant, the through-hole of partition board limits movement of the rope in compression bar on vertical direction, and datum plate is placed
Whether in the top of compression bar, pulling force sensor is connected on rope, and the pulling force of rope is detected, judge cone penetrometer normal
Work.
In the above-described embodiments, the bellows of the materials such as plastics, rubber can be used in marine riser, and the gauffer of bellows may be such that
Marine riser can stretch, and improve the effect of sealing water proof, in certain embodiments, can also pass through the drawing above tripping gear
Water proof rubber sleeve is set on bar, and water proof rubber sleeve is set on pull rod with being in contact on the inside of tube body, to carrying out water proof in tube body.
In the above-described embodiments, further include locating piece, locating piece by nail releasable connection on the inside of tube body, convenient for simplification
The processing flow of tube body, and convenient for being replaced to locating piece and the first spring.
In the above-described embodiments, spring conductor rod is further included, one end of spring conductor rod is fixedly connected with hammer body, the other end
Preset through-hole on across locating piece realizes that spring conductor rod follows hammer body to be lifted in hammer body lifting process, makes the first bullet
Spring stretches along the length direction of spring conductor rod, prevents the first spring distortion.
In the above-described embodiments, the material in hammer body is lead material, and the weight that may be such that hammer body by using lead material adds
Greatly.
In the above-described embodiments, datum plate is further included, datum plate is set at the top of tube body or compression bar, for passing through datum plate
It is contacted with rack, judges whether tube body or compression bar top surface are horizontal.
In the above-described embodiments, linear displacement transducer, such as magnetostrictive displacement sensing can be selected in displacement sensor
Device, photoelectric sensor etc..
In the above-described embodiments, pipe body support can carry out trim by devices such as screw rods.
In the above-described embodiments, the tube body for connecting tripping gear is equipped with multiple through-holes in the longitudinal direction, and tripping gear leads to
The different location being bolted in tube body is crossed, adjustment tripping gear is located at the position in tube body, is breaking off relations to adjust the first spring
Device discharges the length shunk during hammer body；In certain embodiments, tripping gear is set to the top of tube body, and groove is inserted into tube body
Inside sets annular gasket between tube body and tripping gear, and tripping gear is adjusted by increasing and decreasing the quantity of annular gasket
Position.
The above description is only the embodiments of the present invention, not thereby limits the scope of patent protection of the utility model,
Every equivalent structure transformation made based on the specification and figures of the utility model, is directly or indirectly used in other phases
The technical field of pass, is equally included in the patent within the scope of the utility model.
Claims (10)
1. a kind of dynamic penetrometer, which is characterized in that including tube body, pallet, hammer body and the first spring；
The pallet is set to the bottom end of tube body；
The hammer body is set to tubular body, and can be slided along the length direction of tube body, for applying impact force to pallet；
First spring is set to the inside of tube body, and one end of the first spring is connected with tube body, and the other end is connected with hammer body
It connects, for increasing the impact force of hammer body.
2. dynamic penetrometer according to claim 1, which is characterized in that the contact surface of the hammer body and tube body is equipped with logical
Slot, at least one end of the first spring are set in straight slot.
3. dynamic penetrometer according to claim 1, which is characterized in that it further includes and grabs hammer device, it is described to grab hammer device packet
It includes pull rod and grabs hammer pawl, one end of pull rod is used to be connected with power input device；The other end that hammer pawl is articulated with pull rod is grabbed, is used
In grasping hammer body.
4. dynamic penetrometer according to claim 3, which is characterized in that further include second spring, grab hammer pawl top to
Extend above hinged place, one end of second spring is connected with pull rod, and the other end is connected with the hammer pawl of grabbing above hinged place, makes
It grabs hammer pawl and firmly grasps hammer body.
5. dynamic penetrometer according to claim 4, which is characterized in that further include tripping gear, the tripping gear connects
It is connected on the inside of tube body, and is set to and grabs above hammer pawl, tripping gear bottom is equipped with conical socket, and the bottom section area of groove is big
In top cross-section area, enter groove at the top of hammer pawl for making to grab, make to grab hammer pawl disengaging hammer body.
6. dynamic penetrometer according to claim 3, which is characterized in that the quantity for grabbing hammer pawl is two or more.
7. dynamic penetrometer according to claim 1, which is characterized in that further include unidirectional mobile device, the unidirectional shifting
Dynamic device includes rack and pawl, and the rack is vertically arranged, is in contact at the top of bottom and tube body, and pawl is articulated with for solid
It on the pipe body support of fixed tube body, and is in contact with the tooth on rack, for tube body to be driven to do one-way movement downwards.
8. dynamic penetrometer according to claim 7, which is characterized in that further include displacement sensor, the displacement sensing
Device is set on pipe body support, and is connected with tube body, for detecting the settling height of tube body.
9. dynamic penetrometer according to claim 1, which is characterized in that the bottom of the pallet is equipped with screw rod.
10. dynamic penetrometer according to claim 1, which is characterized in that further include compression bar and compression bar connector, the compression bar
It is connected at the top of connector and tube body, the top of compression bar connector is equipped with protrusion, and the bottom of compression bar passes through the protrusion and pipe of compression bar connector
Body is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721123287.2U CN207498925U (en) | 2017-09-04 | 2017-09-04 | A kind of dynamic penetrometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721123287.2U CN207498925U (en) | 2017-09-04 | 2017-09-04 | A kind of dynamic penetrometer |
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| CN207498925U true CN207498925U (en) | 2018-06-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777772A (en) * | 2019-09-24 | 2020-02-11 | 中交第二航务工程局有限公司 | Environment-friendly underwater rammer with air hood and construction method thereof |
| CN111257537A (en) * | 2020-02-14 | 2020-06-09 | 山东大学 | Soil settlement layered monitoring device, mounting method and using method |
-
2017
- 2017-09-04 CN CN201721123287.2U patent/CN207498925U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777772A (en) * | 2019-09-24 | 2020-02-11 | 中交第二航务工程局有限公司 | Environment-friendly underwater rammer with air hood and construction method thereof |
| CN110777772B (en) * | 2019-09-24 | 2021-10-01 | 中交二航局第一工程有限公司 | Construction method of environment-friendly underwater rammer with air hood |
| CN111257537A (en) * | 2020-02-14 | 2020-06-09 | 山东大学 | Soil settlement layered monitoring device, mounting method and using method |
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| CF01 | Termination of patent right due to non-payment of annual fee |