CN109459003A - A kind of measurement construction line pendant - Google Patents
A kind of measurement construction line pendant Download PDFInfo
- Publication number
- CN109459003A CN109459003A CN201811404473.2A CN201811404473A CN109459003A CN 109459003 A CN109459003 A CN 109459003A CN 201811404473 A CN201811404473 A CN 201811404473A CN 109459003 A CN109459003 A CN 109459003A
- Authority
- CN
- China
- Prior art keywords
- fixed
- line
- fallen
- turntable
- measurement
- 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.)
- Pending
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/10—Plumb lines
Abstract
The invention discloses a kind of measurement construction lines to fall, and is related to technical field of building construction tools.The present invention includes fixed frame, fixed frame sliding fit inside has slide bar, fixed frame one end is fixed with support plate, one surface of support plate offers fixation hole, one end of slide bar is fixed with clamping plate, one surface of support plate is fixed with rotating mechanism, and one surface of rotating mechanism is fixed with fixed mechanism and payingoff mechanism, and payingoff mechanism passes through the fixed wired pendant ontology of connecting line.Measuring accuracy of the present invention is high, line pendant facilitates fixed, stablizing effect number, the length of line pendant drawstring facilitates adjusting, the distance of clamping bar can be adjusted according to the thickness of metope, increase the precision of measurement, it can be applicable in the wall of different angle simultaneously, adjusting is facilitated to measure, positioning marking can also be carried out to measurement point in measurement process, manually fixed dashdotted error is reduced, is improved work efficiency.
Description
Technical field
The invention belongs to technical field of building construction tools, fall more particularly to a kind of measurement construction line.
Background technique
Plumb bob is the tool of the inspection verticality of object of most original, and now still in the inspection verticality of object used
One of tool.Present plumb bob tool majority is used in construction site, the method that carpenter, bricklayer, plumber generally use plumb bob messenger wire, directly
The verticality of comparison inspection rod structure, pipeline and wall；On the basis of direct messenger wire, also by plumb bob in conjunction with plank parallel lines
Form new tool --- load ruler is hung, for intuitively examining the verticality of masonry panel, object；Hanging down for plumb bob is also used on building site
Line gives theodolite fixed point location.
Existing construction is relied primarily on squareness measurement to be accomplished manually, and line pendant is inconvenient to fix, holds measurement appearance
It easily shakes, cannot measure immediately, delay the time of measurement, also will affect the accuracy of measurement, for different institutions shape
When the construction account of shape is fixed, existing measurement line pendant is inconvenient to use, influences measurement accuracy and working efficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of measurement construction lines to fall, can be solid with wall by designing one kind
It is fixed, and the line that can adjust measurement direction is fallen, and is solved existing line and is fallen fixed inconvenient, hand-held easy shaking, is not suitable for not
The problem of same thickness of wall body, measurement angle are immobilized and are adjusted, measurement accuracy and working efficiency bottom.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions:
The present invention is a kind of measurement construction line pendant, including fixed frame, the fixed frame sliding fit inside
There is slide bar, described fixed frame one end is fixed with support plate, and one surface of support plate offers fixation hole, one end of the slide bar
It is fixed with clamping plate, the support plate and one surface of clamping plate are respectively and fixedly provided with rubber slab；
One surface of support plate is fixed with rotating mechanism, and one surface of rotating mechanism is fixed with fixed mechanism and unwrapping wire
Mechanism, the payingoff mechanism pass through the fixed wired pendant ontology of connecting line.
Further, one surface of slide bar offers sliding slot, and one surface of fixed frame is threaded with and sliding slot phase
The clamping column of cooperation, the clamping top end are fixedly connected with convex block, and the clamping column is through fixed frame and extends to fixed frame
Inside is matched with sliding slot.
Further, the rotating mechanism includes connecting column and turntable, is provided between the turntable bottom and connecting column
Ball, the ball equidistant ring are arranged between the connecting column of turntable bottom, and the turntable is rotatably assorted with connecting column, and described turn
Panel surface is fixedly connected with fixed mechanism.
Further, the fixed mechanism includes support frame, and the support frame side is fixedly connected with turntable, the support
Frame surface is through there is fixed link, and the fixed link is matched through turntable and with fixation hole, and the fixed link surface loop is around setting
There is reset spring, the reset spring is arranged inside support frame between turntable, and described fixed link one end is fixed with pulling block.
Further, the payingoff mechanism includes actinomycetes box, and one surface of actinomycetes box is fixedly connected with turntable, described to put
Line case inner rotation is combined with shaft, and the shaft surface is fixed with setting reeler, and the setting reeler surface passes through connecting line
It being connect with line pendant ontology, one end of the shaft is fixed with capstan winch through actinomycetes box, and the capstan winch surface is provided with cross convex block,
One surface of actinomycetes box offers the capstan winch slot matched with capstan winch, and the bottom of the capstan winch slot offers fixing groove, described
Through there is the threaded post matched with fixing groove, described threaded post one end is fixed with loosening and tightening wheel, the loosening and tightening wheel table on capstan winch surface
Face offers antiskid thread, and the threaded post is threadedly coupled with capstan winch, and one surface of actinomycetes box is arranged with card slot, the card slot
Card slot is embedded for cross.
Further, line pendant ontology includes cone body, is fixed at the top of the cone body and matches with card slot
Snap ring, the snap ring are cross column snap ring, and the snap ring internal whorl is connected with partition, is fixed at the top of the partition
Mechanism, the top connecting plate for upholding mechanism are upheld, the connecting plate is fixedly connected by connecting line with setting reeler.
Further, the extension mechanism includes spring pocket, spring and sliding sleeve, and the sliding sleeve is slidably matched with spring pocket,
The spring is arranged inside spring pocket and sliding sleeve, and the spring pocket is fixedly connected with partition, and the sliding sleeve is fixed with connecting plate
Connection.
Further, storage bin is offered inside the cone body, and support rod, the branch are fixed with inside the storage bin
Through there is motion bar on strut, described motion bar one end is fixed with sphere, and the motion bar surface is surrounded with extension spring,
The extension spring is arranged between support rod and sphere.
Further, the spherical discharge port being connected to storage bin, the spherical discharging are offered at the cone body tip
Mouth is matched with sphere.
The invention has the following advantages:
The present invention is measured to be fallen with construction line, and measuring accuracy is high, line pendant facilitates fixed, stablizing effect number, and line pendant is drawn
The length of rope facilitates adjusting, and the distance of clamping bar can be adjusted according to the thickness of metope, increases the precision of measurement, while can
It is applicable in the wall of different angle, adjusting is facilitated to measure, positioning marking can also be carried out to measurement point in measurement process, reduce people
Work determines dashdotted error manually, improves work efficiency.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram that present invention measurement is fallen with construction line；
Fig. 2 is the partial enlarged view in Fig. 1 at A；
Fig. 3 is the right view of Fig. 1；
Fig. 4 is the sectional view in Fig. 3 at A-A；
Fig. 5 is the partial enlarged view in Fig. 4 at B；
Fig. 6 is the partial enlarged view in Fig. 4 at C；
Fig. 7 is the structural schematic diagram of actinomycetes box of the present invention；
Fig. 8 is the structural schematic diagram of fixed mechanism of the present invention；
The structural schematic diagram that Fig. 9 is threaded post of the present invention, capstan winch matches
In attached drawing, parts list represented by the reference numerals are as follows:
1- fixed frame, 2- slide bar, 3- support plate, 4- fixation hole, 5- clamping plate, 6- rotating mechanism, 601- connecting column, 602- turn
Disk, 7- fixed mechanism, 701- support frame, 702- fixed link, 703- reset spring, 8- payingoff mechanism, 801- actinomycetes box, 802- turn
Axis, 803- setting reeler, 804- capstan winch, 805- capstan winch slot, 806- fixing groove, 807- threaded post, 808- card slot, 9- line pendant is originally
Body, 901- cone body, 9011- storage bin, 9012- support rod, 9013- motion bar, 9014- sphere, 9015- extension spring,
9016- spherical shape discharge port, 902- snap ring, 903- partition, 904- uphold mechanism, 905- connecting plate, 10- sliding slot, 11- clamping column.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
It please refers to shown in Fig. 1-8, the present invention is that a kind of measure uses construction line pendant, including fixed frame 1, in fixed frame 1
Portion is sliding combined with slide bar 2, and 1 one end of fixed frame is fixed with support plate 3, and 3 one surface of support plate offers fixation hole 4, slide bar 2
One end is fixed with clamping plate 5, and support plate 3 and 5 one surface of clamping plate are respectively and fixedly provided with rubber slab；
3 one surface of support plate is fixed with rotating mechanism 6, and 6 one surface of rotating mechanism is fixed with fixed mechanism 7 and payingoff mechanism
8, payingoff mechanism 8 passes through the fixed wired pendant ontology 9 of connecting line.
Wherein, 2 one surface of slide bar offers sliding slot 10, and 1 one surface of fixed frame is threaded with to be matched with sliding slot 10
Clamping column 11,11 top of clamping column are fixedly connected with convex block, conveniently tighten fixation, clamping column 11 is through fixed frame 1 and extends to
1 inside of fixed frame is matched with sliding slot 10.
Wherein, rotating mechanism 6 includes 602 ball of connecting column 601 and turntable, is set between 602 bottom of turntable and connecting column 601
Be equipped with ball, the ball equidistant ring is arranged between 602 bottom connecting column 601 of turntable, turntable 602 with 601 turns of connecting column
Dynamic cooperation, 602 surface of turntable is fixedly connected with fixed mechanism 7.
Wherein, fixed mechanism 7 includes support frame 701, and 701 side of support frame is fixedly connected with turntable 602, support frame 701
Through there is fixed link 702, fixed link 702 is through turntable 602 and matches with fixation hole 4,702 surface loop winding of fixed link on surface
It is equipped with reset spring 703, the setting of reset spring 703 between 701 inside of support frame and turntable 602, fix by 702 one end of fixed link
There is pulling block, it is convenient that positioning is operated.
Wherein, payingoff mechanism 8 includes actinomycetes box 801, and 801 1 surface of actinomycetes box is fixedly connected with turntable 602, actinomycetes box
801 inner rotations are combined with shaft 802, and 802 surface of shaft is fixed with setting reeler 803, and 803 surface of setting reeler passes through connection
Line is connect with line pendant ontology 9, and one end of shaft 802 is fixed with capstan winch 804 through actinomycetes box 801, and 804 surface of capstan winch is provided with ten
Word convex block, convenient to rotate to capstan winch 804,801 1 surface of actinomycetes box offers the capstan winch slot 805 matched with capstan winch 804,
The bottom of capstan winch slot 805 offers fixing groove 806, and 804 surface of capstan winch, which is run through, the threaded post 807 matched with fixing groove 806,
Threaded post one end is fixed with loosening and tightening wheel, and the elastic wheel surface offers antiskid thread, and threaded post 807 and 804 screw thread of capstan winch connect
It connects, 801 1 surface of actinomycetes box is arranged with card slot 808, and card slot 808 is that cross embeds card slot, the convenient card on line pendant ontology 9
The connection of ring 902 and disassembly.
Wherein, line pendant ontology 9 includes cone body 901, and the top of cone body 901 is fixed with the card matched with card slot 808
Ring 902, snap ring 902 are that 902 internal whorl of cross column snap ring snap ring is connected with partition 903, and the top of partition 903 is fixed with
Mechanism 904 is upheld, the top connecting plate 905 of mechanism 904 is upheld, connecting plate 905 connects by the way that connecting line and setting reeler 803 are fixed
It connects.
Wherein, upholding mechanism 904 includes spring pocket, spring and sliding sleeve, and sliding sleeve is slidably matched with spring pocket, and spring setting exists
Inside spring pocket and sliding sleeve, spring pocket is fixedly connected with partition, and sliding sleeve is fixedly connected with connecting plate, is upheld mechanism 904 and is made line
Pendant ontology 9 is completely embedded with actinomycetes box 801, line pendant ontology 9 will not be separated when not in use with actinomycetes box 801, be facilitated arrangement, fortune
It is defeated.
Wherein, storage bin 9011 is offered inside cone body 901, scribing line can be injected by opening partition in storage bin 9011
Pigment is fixed with support rod 9012, runs through on support rod 9012 convenient for carrying out fixed point scribing line in measurement inside storage bin 9011
There is motion bar 9013,9013 one end of motion bar is fixed with sphere 9014, and 9013 surface of motion bar is surrounded with extension spring
9015, extension spring 9015 is arranged between support rod 9012 and sphere 9014.
Wherein, the spherical discharge port 9016 being connected to storage bin 9011, spherical discharge port are offered at 901 tip of cone body
9016 match with sphere 9014.
One concrete application of the present embodiment are as follows: when construction needs to carry out vertical line measurement to wall, will consolidate first
Determine frame 1 to be placed at the top of wall, adjusts slide bar 2 and support plate 3 and clamping plate 5 are just clamped wall, it is right to tighten clamping column 11
Slide bar 2 is fixed with fixed frame 1, keeps the present apparatus not easily shifted, regulates paying out machine by rotating mechanism 6 and fixed structure 7
Structure 8, at this point, pressing rotation so that line pendant ontology 9 on snap ring 902 separated with card slot 808, pass through capstan winch 804 control shaft 802
Setting reeler 803 is driven to carry out putting drawing connecting line, line pendant ontology 9 moves down, when line pendant ontology 9 is moved down into suitable position
When, the stopping of setting reeler 803 is controlled by capstan winch 804 and puts drawing connecting line, and capstan winch 804 is fixed by threaded post 807,
It avoids capstan winch 804 from rotating, the measurement of wall vertical line can be carried out in this way, after measurement, if necessary to additional telltale mark,
The appropriate unwrapping wire of setting reeler 803 is controlled by capstan winch 804, can put downwards and touch ground, by storage bin 9011
Pigment is marked to complete label, after the completion, capstan winch 804 controls shaft 802 and setting reeler 803 is driven to recycle connecting line, and line falls ontology 9
Reset is moved up, pressing rotational line falls ontology 9, so that snap ring 902 is connect with card slot 808, completes take-up and arranges, facilitate next time
It uses.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention
In example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.
Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to close
Suitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (9)
1. a kind of measurement is fallen with construction line, including fixed frame (1), it is characterised in that: sliding inside the fixed frame (1)
Dynamic to be combined with slide bar (2), described fixed frame (1) one end is fixed with support plate (3), and (3) one surface of support plate offers solid
Determine hole (4), one end of the slide bar (2) is fixed with clamping plate (5)；
(3) one surface of support plate is fixed with rotating mechanism (6), and (6) one surface of rotating mechanism is fixed with fixed mechanism
(7) and payingoff mechanism (8), the payingoff mechanism (8) pass through the fixed wired pendant ontology (9) of connecting line.
2. a kind of measurement according to claim 1 is fallen with construction line, which is characterized in that (2) one surface of slide bar
It offers sliding slot (10), (1) one surface of fixed frame is threaded with the clamping column (11) matched with sliding slot (10), described
Clamping column (11) runs through fixed frame (1) and extends to inside fixed frame (1) to be matched with sliding slot (10).
3. a kind of measurement according to claim 1 is fallen with construction line, which is characterized in that rotating mechanism (6) packet
Connecting column (601) and turntable (602) are included, the turntable (602) is rotatably assorted with connecting column (601), turntable (602) surface
It is fixedly connected with fixed mechanism (7).
4. a kind of measurement according to claim 1 is fallen with construction line, which is characterized in that fixed mechanism (7) packet
It includes support frame (701), support frame (701) side is fixedly connected with turntable (602), and support frame (701) surface is run through
Have fixed link (702), the fixed link (702) is through turntable (602) and matches with fixation hole (4), the fixed link (702)
Surface is surrounded with reset spring (703), and reset spring (703) setting is in support frame (701) inside and turntable (602)
Between.
5. a kind of measurement according to claim 1 is fallen with construction line, which is characterized in that payingoff mechanism (8) packet
It includes actinomycetes box (801), (801) one surface of actinomycetes box is fixedly connected with turntable (602), is turned inside the actinomycetes box (801)
Dynamic to be combined with shaft (802), shaft (802) surface is fixed with setting reeler (803), setting reeler (803) surface
It is connect by connecting line with line pendant ontology (9), one end of the shaft (802) is fixed with capstan winch through actinomycetes box (801)
(804), (801) one surface of actinomycetes box offers the capstan winch slot (805) matched with capstan winch (804), the capstan winch slot
(805) bottom offers fixing groove (806), and capstan winch (804) surface, which is run through, the screw thread matched with fixing groove (806)
Column (807), the threaded post (807) are threadedly coupled with capstan winch (804), and (801) one surface of actinomycetes box is arranged with card slot
(808)。
6. a kind of measurement according to claim 1 is fallen with construction line, which is characterized in that line pendant ontology (9) packet
It includes cone body (901), the snap ring (902) matched with card slot (808), the card is fixed at the top of the cone body (901)
Ring (902) internal whorl is connected with partition (903), is fixed at the top of the partition (903) and is upheld mechanism (904), described to stretch
The top connecting plate (905) of mechanism (904) is opened, the connecting plate (905) connects by the way that connecting line and setting reeler (803) are fixed
It connects.
7. a kind of measurement according to claim 6 is fallen with construction line, which is characterized in that the extension mechanism (904)
Including spring pocket, spring and sliding sleeve, the sliding sleeve is slidably matched with spring pocket, and the spring is arranged in spring pocket and sliding sleeve
Portion, the spring pocket are fixedly connected with partition, and the sliding sleeve is fixedly connected with connecting plate.
8. a kind of measurement according to claim 6 is fallen with construction line, which is characterized in that in the cone body (901)
Portion offers storage bin (9011), is fixed with support rod (9012) inside the storage bin (9011), the support rod (9012)
Above through having motion bar (9013), described motion bar (9013) one end is fixed with sphere (9014), motion bar (9013) table
Face ring is provided around extension spring (9015), the extension spring (9015) setting support rod (9012) and sphere (9014) it
Between.
9. a kind of measurement according to claim 8 is fallen with construction line, which is characterized in that cone body (901) point
The spherical discharge port (9016) being connected to storage bin (9011), the spherical shape discharge port (9016) and sphere are offered at end
(9014) it matches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811404473.2A CN109459003A (en) | 2018-11-23 | 2018-11-23 | A kind of measurement construction line pendant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811404473.2A CN109459003A (en) | 2018-11-23 | 2018-11-23 | A kind of measurement construction line pendant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109459003A true CN109459003A (en) | 2019-03-12 |
Family
ID=65611391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811404473.2A Pending CN109459003A (en) | 2018-11-23 | 2018-11-23 | A kind of measurement construction line pendant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109459003A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678418A (en) * | 2020-04-29 | 2020-09-18 | 乐清市城镇建设工程公司 | Verticality measuring device is built in room |
| CN111827127A (en) * | 2020-08-11 | 2020-10-27 | 武汉木合石建筑科技有限公司 | Road and bridge dotting method for municipal construction |
| CN111854720A (en) * | 2020-08-31 | 2020-10-30 | 武汉德创天成科技发展有限公司 | Building engineering straightness detection device that hangs down convenient to remove |
| CN112212831A (en) * | 2020-09-02 | 2021-01-12 | 乐清市城镇建设工程公司 | Verticality measuring device is built in room |
| CN112366605A (en) * | 2020-11-04 | 2021-02-12 | 张静 | Wiring device for road and bridge construction |
| CN112378391A (en) * | 2020-05-31 | 2021-02-19 | 中国二十二冶集团有限公司 | Building wall building verticality pay-off device with parapet wall and verticality pay-off control construction method |
| CN113532405A (en) * | 2021-07-19 | 2021-10-22 | 王烁程 | Stable drop wire capable of avoiding long-time swinging for constructional engineering and operation method thereof |
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| CN107270872A (en) * | 2017-07-26 | 2017-10-20 | 吴义锖 | A kind of construction is fallen with measurement line |
| CN206818210U (en) * | 2017-06-28 | 2017-12-29 | 李小燕 | A kind of construction Multifunctional line weight |
| CN207036117U (en) * | 2017-08-08 | 2018-02-23 | 何伟 | A kind of construction line pendant |
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| US5791061A (en) * | 1996-04-08 | 1998-08-11 | Modugno; Giuseppe | Marking plumb bob |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111678418A (en) * | 2020-04-29 | 2020-09-18 | 乐清市城镇建设工程公司 | Verticality measuring device is built in room |
| CN112378391A (en) * | 2020-05-31 | 2021-02-19 | 中国二十二冶集团有限公司 | Building wall building verticality pay-off device with parapet wall and verticality pay-off control construction method |
| CN112378391B (en) * | 2020-05-31 | 2024-03-26 | 中国二十二冶集团有限公司 | Perpendicularity paying-off device for building wall with parapet wall and perpendicularity paying-off control construction method |
| CN111827127A (en) * | 2020-08-11 | 2020-10-27 | 武汉木合石建筑科技有限公司 | Road and bridge dotting method for municipal construction |
| CN111854720A (en) * | 2020-08-31 | 2020-10-30 | 武汉德创天成科技发展有限公司 | Building engineering straightness detection device that hangs down convenient to remove |
| CN111854720B (en) * | 2020-08-31 | 2021-04-06 | 广西建鑫工程检测咨询有限公司 | Building engineering straightness detection device that hangs down convenient to remove |
| CN112212831A (en) * | 2020-09-02 | 2021-01-12 | 乐清市城镇建设工程公司 | Verticality measuring device is built in room |
| CN112366605A (en) * | 2020-11-04 | 2021-02-12 | 张静 | Wiring device for road and bridge construction |
| CN113532405A (en) * | 2021-07-19 | 2021-10-22 | 王烁程 | Stable drop wire capable of avoiding long-time swinging for constructional engineering and operation method thereof |
| CN113532405B (en) * | 2021-07-19 | 2023-09-01 | 新疆汉块建设工程有限公司 | Stable falling line capable of avoiding long-time swing for constructional engineering and operation method thereof |
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