CN111893999A - Pile pulling guide frame and pile pulling method for waste inclined piles - Google Patents
Pile pulling guide frame and pile pulling method for waste inclined piles Download PDFInfo
- Publication number
- CN111893999A CN111893999A CN202010664195.5A CN202010664195A CN111893999A CN 111893999 A CN111893999 A CN 111893999A CN 202010664195 A CN202010664195 A CN 202010664195A CN 111893999 A CN111893999 A CN 111893999A
- Authority
- CN
- China
- Prior art keywords
- pile
- guide frame
- waste
- frame body
- pulling
- 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.)
- Granted
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
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)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a pile pulling guide frame and a pile pulling method for waste inclined piles, which are used for guiding a pile casing to be sleeved on a waste pile at a certain interval, and the pile pulling guide frame comprises: the supporting assembly comprises two supporting frames which are respectively positioned at two opposite sides of the guide frame body; the guide frame body is rotatably arranged between the two support frames, a through hole for the protective cylinder to penetrate through is formed in the guide frame body, and rotating shafts which are rotatably connected to the two support frames around the axis are fixedly arranged on two opposite sides of the guide frame body respectively; and the locking device is used for locking the guide frame body to rotate and is arranged on the guide frame body or the supporting frame. The invention can rapidly pull out the waste pile body and greatly reduce the construction cost.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a pile pulling guide frame and a pile pulling method for waste inclined piles.
Background
Along with the continuous development of urban construction, the shortage of construction land is a general problem, and a lot of project constructions are constructed after the original engineering is dismantled, and the condition that the abandoned pile foundation needs to be pulled out is often met in the reconstruction process. The traditional pile pulling process is divided into two conditions according to the size of the pile diameter, the pile length and the geological condition when the vertical pile is pulled out: 1. aiming at the soft soil stratum, a sinking sleeve and turning plate upward pulling technology is adopted; 2. pile pulling is carried out on the large-diameter hard stratum by adopting a full-slewing drilling machine; however, when the inclined pile (with an angle) is encountered, only the resonance-free double-sleeve pile pulling process can be adopted, the price is very high, and the construction cost is greatly increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a pile pulling guide frame and a pile pulling method for waste inclined piles, which can quickly pull out waste pile bodies and greatly reduce the construction cost.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a pile pulling leading truck of abandonment batter pile for the direction protects a section of thick bamboo and makes it locate useless stake with the determining deviation cover, and its characterized in that pulls out the pile leading truck and includes:
the supporting assembly comprises two supporting frames which are respectively positioned at two opposite sides of the guide frame body;
the guide frame body is rotatably arranged between the two support frames, a through hole for the protective cylinder to penetrate through is formed in the guide frame body, and rotating shafts which are rotatably connected to the two support frames around the axis are fixedly arranged on two opposite sides of the guide frame body respectively;
the locking device is used for locking the guide frame body to rotate, and the locking device is installed on the guide frame body and used for connecting the guide frame body with the construction ground or installed on the support frame and used for connecting the guide frame body with the support frame.
Optionally, the locking device includes a plurality of mounting blocks respectively located at corners of the guiding frame body, and an anchor rod is correspondingly penetrated through each of the mounting blocks at each corner.
Optionally, a control device and a driving part electrically connected to the control device are fixedly arranged on the support frame, and the rotating shaft is fixedly connected to a rotating end of the driving part.
Optionally, a blade foot is fixedly arranged on the outer side wall of the end part of the casing.
Optionally, four blade feet are annularly and equidistantly arranged on the casing.
Optionally, the rotating shaft is connected with the guide frame body through a bolt.
And the pile pulling method of the abandoned batter pile comprises the following steps:
placing the pile pulling guide frame of the waste inclined pile on the construction ground at the waste pile position, enabling the through hole to correspond to the top end extension line of the waste pile or be sleeved on the pile head of the waste pile exposed out of the ground, and enabling the two support frames to be respectively positioned on two sides of the waste pile vertical to the construction ground;
rotating the guide frame body until the inclination angles of the guide frame body and the waste pile are consistent;
locking the angle between the guide frame body and the ground by using the locking device to fix the guide frame body;
sequentially inserting a plurality of pile casings with the inner diameter larger than the diameter of the waste pile into the through hole and driving the pile casings into the ground, so that the pile casings are sleeved on the waste pile at a certain interval until the bottom end of each pile casing is lower than the bottom end of the waste pile;
and removing soil in the space between the pile casing and the waste pile.
Pulling out the waste pile;
and pulling out the protective cylinder.
Optionally, two adjacent casing tubes are connected by welding.
Optionally, the pile casing is driven until the bottom end of the pile casing is 50cm-100cm lower than the bottom end of the waste pile.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the angle of the guide frame can be adjusted according to the angle of the waste pile, the angle of the driven pile casing is controlled and guided by the through hole in the guide frame, and the waste pile is smoothly pulled out by combining the flushing and pile pulling construction method, so that the construction cost can be greatly reduced, the construction efficiency is higher, the requirement on site pile pulling is lower, and the operation is simple. Meanwhile, the bottom of the protective cylinder is additionally provided with the cutting edge, so that the protective cylinder is more easily and obliquely driven into the ground.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view showing the overall structure of an embodiment of a pile-pulling guide frame for a waste batter pile according to the present invention.
Fig. 2 shows a schematic structural diagram of a casing according to an embodiment of the present invention.
Fig. 3 shows a schematic view of a pile pulling guide frame in a use state according to an embodiment of the invention.
Fig. 4 shows a schematic side use state diagram of the pile pulling guide frame according to the embodiment of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 1-2, a pile pulling guide frame for a waste batter pile according to an embodiment of the present invention is used for guiding a pile casing 8 to be sleeved on a waste pile 10 at a certain distance, and includes: the supporting assembly comprises two supporting frames 2 which are respectively positioned at two opposite sides of the guide frame body 1; the guide frame body 1 is rotatably arranged between the two support frames 2, a through hole 3 for the protective cylinder 8 to penetrate through is formed in the guide frame body 1, and two opposite sides of the guide frame body 1 are respectively and fixedly provided with a rotating shaft 4 which is rotatably connected to the two support frames 2 around an axis; the locking device is used for fixedly installing the position of the guide frame body 1, and is arranged on the guide frame body 1 and used for connecting the guide frame body 1 with the construction ground or arranged on the support frame 2 and used for connecting the guide frame body 1 with the support frame 2.
Further comprising: the rotating shaft 4 is rotatably connected with the driving part, and the driving part is arranged on the support frame 2; a control device 5 for controlling the drive means.
The locking device comprises a plurality of mounting blocks 6 which are respectively positioned at the corners of the guide frame body 1, an anchor rod 7 is correspondingly arranged on each mounting block 6 at each corner in a penetrating mode, and after the angle of the guide frame is adjusted in place, the anchor rods 7 are anchored on the ground, so that the angle of the guide frame body can be locked and cannot rotate, and the protective cylinder 8 can be guided and moved in the through hole 3 of the guide frame.
The driving part is a driving motor electrically connected with the control device 5, the driving end of the driving motor is fixedly connected with the rotating shaft, and the rotating shaft 4 is driven to rotate through the driving motor, so that the rotating shaft 4 drives the guide frame body to rotate to adjust the angle.
In this embodiment, be equipped with the control panel on controlling means 5, obtain useless stake 10's inclination through measurement and calculation to transmit data to controlling means 5 through the control panel, thereby control drive assembly through controlling means 5, and then make leading truck body turned angle and the data matching of input, correspond with the angle of useless stake with this, angle modulation is more accurate, and more convenient.
As shown in fig. 2, the outer side wall of the end portion of the protective cylinder 8 is fixedly provided with four cutting edges 9, the outer side wall of the end portion of the protective cylinder 8 is provided with four cutting edges 9, the four cutting edges 9 are arranged at intervals of 90 degrees along the outer surface of the protective cylinder 8, the protective cylinder 8 is more convenient to drive into the ground through the cutting edges 9, when the protective cylinder 8 is arranged in the through hole 3 in a penetrating manner and moves along the side wall of the through hole 3, a certain distance is formed between the other sides of the protective cylinder 8 and the inner wall of the through hole 3, so that when the protective cylinder 8 is arranged in the penetrating manner, the through hole 3 has enough space to enable the cutting edges 9 to penetrate to the lower end of the through hole 3 along with the protective cylinder.
The pivot 4 through the bolt with leading truck body 1 is connected, realizes the connection of pivot 4 and leading truck body 1 through the bolt for leading truck body 1 between two pivots 4 can be changed, thereby corresponds the useless stake of different stake footpaths and changes leading truck body 1 that has not equidimension through-hole 3, makes and uses more extensively.
Further, as shown in fig. 3 and 4 in combination with fig. 1 and 2, the method for extracting a waste batter pile according to the embodiment of the present invention, which uses the pile-extracting guide frame of the waste batter pile, includes the following steps:
s1: and arranging the pile pulling guide frame on the construction ground at the position of the waste pile 10, enabling the two support frames of the pile pulling guide frame to be respectively positioned at two sides of the waste pile 10 vertical to the construction ground, and enabling the through hole 3 to be corresponding to the top end extension line of the waste pile 10 or sleeved on the pile head of the waste pile 10 exposed out of the ground.
When the pile head at the top end of the waste pile 10 is exposed out of the ground to be higher, the through hole 3 of the device can be directly sleeved on the waste pile 10 and placed on the construction ground, wherein the pile head can rotate in the through hole at a certain angle; when the top end of the waste pile 10 is exposed to the ground or is flush with the ground or is completely buried in the ground, the through hole 3 in the device is corresponding to the extension line of the waste pile 10 through angle calculation when the guide frame is installed.
S2: the driving part drives the rotating shaft 4 to rotate through the control device 5, and the rotating shaft 4 drives the guide frame body 1 to rotate until the inclination angle of the guide frame body 1 is consistent with that of the waste pile 10.
Before the angle of adjustment leading truck body 1, need earlier to measure the calculation to the angle of useless stake 10, reachs the inclination of useless stake 10 to with angle value input controlling means 5, make controlling means 5 drive pivot 4 rotate, make pivot 4 drive leading truck body 1 rotate to the inclination of leading truck body 1 the same with the inclination of useless stake 10.
S3: and locking the angle between the guide frame body 1 and the ground by using the locking device to fix the guide frame body.
A plurality of anchor rods 7 on the peripheral side of the guide frame body 1 are anchored to the ground bottom, so that the angle of the guide frame body 1 can be locked.
S4: inserting a plurality of pile casings 8 with the inner diameter larger than the diameter of the waste pile into the through hole 3 in sequence and driving the pile casings into the ground in sequence under the guiding action of the side wall of the through hole 3 through a driving and pulling machine, so that the plurality of pile casings 8 are sleeved on the waste pile 10 and form a gap with the waste pile 10 until the bottom end of the driven pile casing 8 is deeper than the waste pile 10.
And two adjacent pile casings 8 are connected by welding, when one pile casing 8 is inserted into the ground, the other pile casing 8 is welded and lengthened at the top end of the pile casing 8 by welding and is driven into the ground until the depth of the pile casing 8 is 50-100 cm deeper than that of the waste pile 10.
S5: and discharging soil in the gap between the pile casing 8 and the waste pile 10.
Namely, a large amount of high-pressure water and high-pressure air are utilized to flush the soil body in the gap between the pile casing 8 and the waste pile 10 into slurry, and the slurry is pumped out and discharged by a pump, so that the subsequent removal of the waste pile 10 is facilitated.
S6: the scrap pile 10 is pulled out by a crane.
In this embodiment, the crane may be a truck crane or a crawler crane.
S7: and after the waste pile 10 is completely pulled out, pulling out the pile casing 8 by a pulling machine.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a pile pulling leading truck of abandonment batter pile for the direction protects a section of thick bamboo and makes it locate useless stake with the determining deviation cover, and its characterized in that pulls out the pile leading truck and includes:
the supporting assembly comprises two supporting frames which are respectively positioned at two opposite sides of the guide frame body;
the guide frame body is rotatably arranged between the two support frames, a through hole for the protective cylinder to penetrate through is formed in the guide frame body, and rotating shafts which are rotatably connected to the two support frames around the axis are fixedly arranged on two opposite sides of the guide frame body respectively;
the locking device is used for locking the guide frame body to rotate, and the locking device is installed on the guide frame body and used for connecting the guide frame body with the construction ground or installed on the support frame and used for connecting the guide frame body with the support frame.
2. The pile-pulling guide frame for the abandoned batter pile as claimed in claim 1, wherein the locking device comprises a plurality of mounting blocks respectively located at the corners of the guide frame body, and an anchor rod is correspondingly penetrated through the mounting block at each corner.
3. The pile pulling guide frame for the abandoned batter pile according to claim 1, wherein a control device and a driving part electrically connected with the control device are fixedly arranged on the support frame, and the rotating shaft is fixedly connected with a rotating end of the driving part.
4. The pile-pulling guide frame for the abandoned batter pile as defined in claim 1, wherein the outer side wall of the end part of the casing is fixedly provided with a cutting edge.
5. The pile-pulling guide frame for the abandoned batter pile as defined in claim 4, wherein four blade feet are annularly and equally spaced on the casing.
6. A pile pulling guide frame for a waste batter pile according to claim 1, wherein the rotating shaft is connected with the guide frame body by a bolt.
7. A pile pulling method for a waste inclined pile is characterized by comprising the following steps:
placing the pile pulling guide frame of the waste inclined pile according to claim 1 on a construction ground at a waste pile, and enabling the through hole to correspond to the top end extension line of the waste pile or be sleeved on a pile head of the waste pile exposed out of the ground, and the two support frames are respectively located on two sides of the waste pile perpendicular to the construction ground;
rotating the guide frame body until the inclination angles of the guide frame body and the waste pile are consistent;
locking the angle between the guide frame body and the ground by using the locking device to fix the guide frame body;
sequentially inserting a plurality of pile casings with the inner diameter larger than the diameter of the waste pile into the through hole and driving the pile casings into the ground, so that the pile casings are sleeved on the waste pile at a certain interval until the bottom end of each pile casing is lower than the bottom end of the waste pile;
removing soil in the space between the pile casing and the waste pile;
pulling out the waste pile;
and pulling out the protective cylinder.
8. A pile extracting method for a waste batter pile as claimed in claim 7, wherein adjacent two of said casings are connected by welding.
9. A pile extracting method for a waste batter pile according to claim 7, wherein the pile casing is driven until the bottom end of the pile casing is 50cm to 100cm lower than the bottom end of the waste pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664195.5A CN111893999B (en) | 2020-07-10 | 2020-07-10 | Pile pulling guide frame and pile pulling method for waste inclined piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010664195.5A CN111893999B (en) | 2020-07-10 | 2020-07-10 | Pile pulling guide frame and pile pulling method for waste inclined piles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111893999A true CN111893999A (en) | 2020-11-06 |
| CN111893999B CN111893999B (en) | 2022-03-01 |
Family
ID=73192345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010664195.5A Active CN111893999B (en) | 2020-07-10 | 2020-07-10 | Pile pulling guide frame and pile pulling method for waste inclined piles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111893999B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150663A (en) * | 2021-11-29 | 2022-03-08 | 安徽省建筑科学研究设计院 | Anchor pile fixing frame |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010180610A (en) * | 2009-02-05 | 2010-08-19 | Nippon Steel Engineering Co Ltd | Construction method for inclined pile and construction facility for inclined pile |
| CN105464117A (en) * | 2015-12-25 | 2016-04-06 | 天津港航工程有限公司 | Rotary-type overwater piling guide frame and piling process for overwater pile group foundations |
| CN106320340A (en) * | 2016-10-12 | 2017-01-11 | 中建港务建设有限公司 | Vibrating sleeve for pile extracting and high-pressure water-jetting and pile-extracting process |
| CN207092076U (en) * | 2017-08-07 | 2018-03-13 | 中国建筑西南勘察设计研究院有限公司 | A kind of guider of steel pile casting |
| CN108487247A (en) * | 2018-05-18 | 2018-09-04 | 朱静洁 | A kind of fixing-aid device for building stake in engineering construction |
| CN111155523A (en) * | 2020-01-21 | 2020-05-15 | 中交武汉港湾工程设计研究院有限公司 | Underground pile foundation demolition method and device |
-
2020
- 2020-07-10 CN CN202010664195.5A patent/CN111893999B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010180610A (en) * | 2009-02-05 | 2010-08-19 | Nippon Steel Engineering Co Ltd | Construction method for inclined pile and construction facility for inclined pile |
| CN105464117A (en) * | 2015-12-25 | 2016-04-06 | 天津港航工程有限公司 | Rotary-type overwater piling guide frame and piling process for overwater pile group foundations |
| CN106320340A (en) * | 2016-10-12 | 2017-01-11 | 中建港务建设有限公司 | Vibrating sleeve for pile extracting and high-pressure water-jetting and pile-extracting process |
| CN207092076U (en) * | 2017-08-07 | 2018-03-13 | 中国建筑西南勘察设计研究院有限公司 | A kind of guider of steel pile casting |
| CN108487247A (en) * | 2018-05-18 | 2018-09-04 | 朱静洁 | A kind of fixing-aid device for building stake in engineering construction |
| CN111155523A (en) * | 2020-01-21 | 2020-05-15 | 中交武汉港湾工程设计研究院有限公司 | Underground pile foundation demolition method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150663A (en) * | 2021-11-29 | 2022-03-08 | 安徽省建筑科学研究设计院 | Anchor pile fixing frame |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111893999B (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8631627B2 (en) | Helical pole support bracket and method for supporting a pole | |
| CN110984852B (en) | Triaxial stirring stake machine with function of rectifying | |
| CN106088064A (en) | A kind of hard stratum precrushing three axle cement mixing pile drilling tool and construction method thereof | |
| CN214832669U (en) | Tubular pile perpendicularity regulating and controlling device | |
| CN111893999B (en) | Pile pulling guide frame and pile pulling method for waste inclined piles | |
| GB2154630A (en) | Construction method for foundation piling | |
| JP3428917B2 (en) | Auger screw and excavation method using it | |
| JPH11350473A (en) | Execution method for steel pipe pile | |
| CN210658376U (en) | Deep foundation pit supporting structure | |
| CN110952535B (en) | Steel pipe pile construction method | |
| JP2942779B1 (en) | Underground wall construction method | |
| KR101923826B1 (en) | Auger apparatus with rectangular bit structure | |
| CN112502170A (en) | Foundation ditch side slope reinforcing apparatus for building engineering | |
| CN113089682A (en) | High-strength tubular pile foundation pit supporting structure for geotechnical engineering | |
| CN206941610U (en) | Clothoid type steel pipe support pile and support anchor rod | |
| JP2004218378A (en) | Removing method for existing pile | |
| JP2005240282A (en) | Inner excavation tip enlarged foot protection method of foundation hollow pile and apparatus | |
| CN220769356U (en) | Drilling machine erecting device | |
| CN216008390U (en) | Sandstone drilling equipment for rock stratum bored concrete pile pore-forming | |
| CN217601456U (en) | Deep foundation pit supporting beam frame structure for geotechnical engineering | |
| CN215804346U (en) | Drilling equipment for cast-in-place pile | |
| CN218117696U (en) | Water mill bores pore-forming construction positioner | |
| US11898445B1 (en) | Portable coring machine | |
| CN217359067U (en) | Drilling and coring device for quick engineering supervision | |
| CN214007113U (en) | Dig bored concrete pile soon and use supporting fixture convenient to butt joint pipeline |
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 | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230302 Address after: 201100 area a, 1st floor, building 104, no.1-30, Lane 88, Minbei Road, Minhang District, Shanghai Patentee after: China Construction Eighth Engineering Bureau General Contracting Construction Co.,Ltd. Address before: 200122 Pudong New Area, Shanghai, China (Shanghai) free trade trial area 1568 Century Avenue 27 Patentee before: CHINA CONSTRUCTION EIGHTH ENGINEERING DIVISION Co.,Ltd. |
|
| TR01 | Transfer of patent right |