CN109443327A - A kind of distribution method of SURVEYING CONTROL NETWORK - Google Patents
A kind of distribution method of SURVEYING CONTROL NETWORK Download PDFInfo
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- CN109443327A CN109443327A CN201811402990.6A CN201811402990A CN109443327A CN 109443327 A CN109443327 A CN 109443327A CN 201811402990 A CN201811402990 A CN 201811402990A CN 109443327 A CN109443327 A CN 109443327A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 76
- 239000004567 concrete Substances 0.000 claims abstract description 18
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 15
- 239000011178 precast concrete Substances 0.000 claims abstract description 9
- 238000012552 review Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- 210000004209 hair Anatomy 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000000691 measurement method Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 238000009435 building construction Methods 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000010412 perfusion Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 239000007787 solid Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000178 monomer Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The present invention relates to a kind of distribution methods of SURVEYING CONTROL NETWORK, and the laying at net control point is controlled including general layout, will survey the point cross small arc shaped frame set and control point, bury pre-cast concrete stake in control point；Pre-cast concrete stake is made of reinforcing bar casting concrete, and reinforcing bar is the reinforcing bar of diameter 30mm or more, and upper end polishes, and in delineation cross hairs above, as punctuate, lower end hooking is poured among concrete；Stake bottom size is not less than stake top size；Theodolite is erected on the axial line control stake position of margin of foundation pit by the measure axis of underground；The measurement of superstructure engineering calculates the X, Y coordinates of horizontal control point according to the X, Y coordinates that drawing gives, and the review at control point is carried out using total station.Advantage is: it is easy to operate simple, improve measurement accuracy.Its control stake is solid and reliable, not affected by environment, it is ensured that subsequent measurement accuracy.
Description
Technical field
The invention belongs to building field more particularly to a kind of distribution methods of SURVEYING CONTROL NETWORK.
Background technique
It before construction, needs to carry out in-site measurement, to design drawing unwrapping wire, repetition measurement is carried out to point, line, drafting pattern,
The laying of SURVEYING CONTROL NETWORK and the foundation of building coordinate system are main actions in measurement process.
According to construction drawing, the foundation of building coordinate system can establish subregion as needed, and each coordinate system corresponds to each
A monomer, it is ensured that each monomer measurement is independent from each other, and a few set coordinate-systems can be converted mutually, can pass through remaining coordinate
System is mutually to check.
The net form being made of control point is known as controlling net, and task is the foundation as lower grade measurement work,
Control action is played in precision.Actual measurement work in, the area Xian Ce select it is some have control meaning points, first they
Plan-position and elevation, which accurately determine, to be come, and then measures other detail points further according to them.SURVEYING CONTROL NETWORK is according to building
Flat shape, the axis combination measurement method of object are configured.
In the prior art, commonly the way at embedded control point is to make mark to laying of markstone, or charging electric hammer pore-forming, concreting
Mark the mode of core.The measurement mark core of plane and vertical control point is fixed on markstone, 1. the method for embedding of markstone, which is usually taken, to be opened
2. the foundation pit for digging embedded measurement control point markstone pours mixed mud 3. to bury the maintenance etc. that 4. thes cement solidifies of measurement control point mark core main
Want step.But such mode measurement accuracy not can guarantee.
Summary of the invention
In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a kind of distribution methods of SURVEYING CONTROL NETWORK, improve
Measurement accuracy.
To achieve the above object, the invention is realized by the following technical scheme:
A kind of distribution method of SURVEYING CONTROL NETWORK, comprising the following steps:
1) laying at general layout control net control point
The point cross small arc shaped frame set will be surveyed and control point, bury pre-cast concrete stake in control point；Pre-cast concrete
Stake is made of reinforcing bar casting concrete, and reinforcing bar is the reinforcing bar of diameter 30mm or more, and upper end polishes, and is delineating cross hairs conduct above
Punctuate, lower end hooking, is poured among concrete；Stake top is not less than having a size of 150mm × 150mm, stake bottom size
Stake top size；After hole position has been dug, wherein by concrete stake perfusion, before the cement has set, adjustment reinforcing bar position is controlled with portal frame
It sets on origin position；
2) measure axis of underground
Theodolite is erected on the axial line control stake position of margin of foundation pit；After centering, leveling, backsight same direction stake,
It will be on the plane layer of required axis projection to construction；The longitudinal and transverse axis for throwing survey on the same layer is respectively no less than two；Made with this
The check of angle, distance；After check is errorless, other corresponding axis and thin portion line are released on this plane；In each floor
During axis projection, the vertical vertical shift of the axis of upper and lower level must not exceed 2mm；
3) measurement of superstructure engineering
The control points layout of main part: calculating the X, Y coordinates of horizontal control point according to the X, Y coordinates that drawing gives,
The review at control point is carried out using total station；
A hangs down quasi- pilot measurement method
Construction survey precision is influenced big, increase construction survey datum layer, reduction laser by structure self-vibration, wind shake, sunshine
Height is surveyed in the throwing of collimator, and is transmitted by measuring basis layer, and dynamic measuring data is handled, and eliminates structure self-vibration, wind shake pair
The influence of construction survey precision；
Measure control point should every layer of at least two control point, two control point height differences be not more than 15 meters, carry out main building construction layer
When with roofing measurement, the vertical transmitting and converting of datum mark is controlled, reduces the influence thrown and survey excessive height to construction survey precision；
B vertical survey method
The same time carries out squareness measurement in the morning, reduces influence of the sunshine to squareness measurement precision；And by solid
Fixed measurement construction personnel controls the human error of measurement accuracy；Using laser optical method, instrument is using laser vertical instrument or swashs
Light theodolite；Three class control point passes through measurement preformed hole pilot measurement to operation by ± 0.00 floor laser vertical instrument by stairwell
Then layer is thrown using theodolite and surveys cross control axis by stairwell；
C throws the measuring point measured on operation platform, and position number was 1 survey time, and mean square error of angle observation is ± 8 " between, quadrangle right angle
Error is at 90 ° ± 10 " between, span error be 1:20000, cross axle line endpoints error under ±2 mm, quadrangle angle point error ±
3mm, since floor surface concrete has Planar Contraction phenomenon, when measuring length, side length is not less than design length；
The d measurement of higher degree
1. elevation Fixed Initial Point
Vertical control network line of level is pressed annular mis-tie misclosure and is calculated, and every km measurement of the level mis-tie misclosure is calculated by formula (1):
In formula (1): MW is mis-tie misclosure, and L is path length；
2. absolute altitude is arranged
Using bench mark pilot measurement to the datum grade of underground three as subsurface level pilot measurement foundation；After building goes out ground, with
Bench mark is critically in elevation pilot measurement to first floor outline border trestle, as upward pilot measurement height datum point, and and subsurface level into
Row tie-in；
3. vertical vertical control survey method
With the first floor ,+1.000m, as upward pilot measurement foundation:
Steel ruler measures pilot measurement method: after exterior frame column form removable, the preceding paragraph layer is vertically measured along pillar for concrete every one layer of construction
Rise is from as next layer of elevation setting-out foundation, checking absolute altitude by checking point, the two with the calibration of Red Triangle region mark
Error is no more than 2mm；
Vertical telemetry: it every 20 meters with steel ruler method pilot measurement absolute altitude is suspended in midair, eliminates and is surveyed as caused by inclination and verticality
Measure error；Vertical ranging adds bend pipe using total station, measures longer section and hangs down away from control steel ruler measures cumulative errors paragraph by paragraph, checks
The absolute altitude being already provided on the borehole wall；On floor vertical measurement hole, total station is set up using point height known on wall and measures instrument
Device view is high, then measures to receiving station prism and hangs down away from prism mirror surface is downward, and founds levelling rod on prism bases, and absolute altitude is arranged
Mark；
Trigonometric Leveling: elevational point is acquired on floor face: at the ground of nearly BM bench mark, whole station is set
Instrument, with the mark post of two root device prisms, one is stood on BM bench mark, and one is stood in required point, measures instrument respectively to BM
The height difference hl and h2 of bench mark and required point, can calculate required point elevation；When measurement, the vertical prism absolute altitude in two places is consistent
When:
HN1=BM1+h2-h1 (2)
In formula (2), HN1 is prism absolute altitude, and BM1 is elevation, and hl is instrument to BM bench mark height difference, and h2 is instrument to required
Point height difference；If instrument to BM bench mark measures negative height difference, sign-alternating number is "+" before hl.
Compared with prior art, the beneficial effects of the present invention are:
The distribution method of SURVEYING CONTROL NETWORK is easy to operate simple, improves measurement accuracy.Its control stake it is solid and reliable, not by
Environment influences, it is ensured that subsequent measurement accuracy.Squareness measurement using the same personnel measurement of same time, reduce it is external because
The influence of element, improves measurement quality.The measurement accuracy of strategic point simultaneously, and then ensure that the quality of measurement.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of pre-cast concrete stake.
Fig. 2 is under ground portion measure axis schematic diagram.
Fig. 3 is under ground portion flooring measure axis schematic diagram.
Fig. 4 is the schematic diagram at control point.
In figure: 1- reinforcing bar 2- concrete 3- backfill 4- axis 5- controls the control point stake 6- theodolite 7-.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings of the specification, it should be noted that implementation of the invention is unlimited
In the following embodiments and the accompanying drawings.
See Fig. 1-Fig. 4, a kind of distribution method of SURVEYING CONTROL NETWORK, comprising the following steps:
1) laying at general layout control net control point
The point cross small arc shaped frame set will be surveyed and control point, bury pre-cast concrete stake in control point；Pre-cast concrete
Stake is made of reinforcing bar casting concrete, and reinforcing bar is the reinforcing bar of diameter 30mm or more, and upper end polishes, and is delineating cross hairs conduct above
Punctuate, lower end hooking, is poured among concrete；Stake top is not less than having a size of 150mm × 150mm, stake bottom size
Stake top size；After hole position has been dug, wherein by concrete stake perfusion, before the cement has set, adjustment reinforcing bar position is controlled with portal frame
It sets on origin position, sees Fig. 1；
2) measure axis of underground
Theodolite is erected on the axial line control stake position of margin of foundation pit；After centering, leveling, backsight same direction stake,
It will be on the plane layer of required axis projection to construction；The longitudinal and transverse axis for throwing survey on the same layer is respectively no less than two；Made with this
The check of angle, distance；After check is errorless, other corresponding axis and thin portion line are released on this plane；In each floor
During axis projection, the vertical vertical shift of the axis of upper and lower level must not exceed 2mm, see Fig. 2, Fig. 3；
3) measurement of superstructure engineering
See Fig. 4, the control points layout of main part: calculating X, Y of horizontal control point according to the X, Y coordinates that drawing gives
Coordinate carries out the review at control point using total station；
A hangs down quasi- pilot measurement method
Construction survey precision is influenced big, increase construction survey datum layer, reduction laser by structure self-vibration, wind shake, sunshine
Height is surveyed in the throwing of collimator, and is transmitted by measuring basis layer, and dynamic measuring data is handled, and eliminates structure self-vibration, wind shake pair
The influence of construction survey precision；
Measure control point should every layer of at least two control point, two control point height differences be not more than 15 meters, carry out main building construction layer
When with roofing measurement, the vertical transmitting and converting of datum mark is controlled, reduces the influence thrown and survey excessive height to construction survey precision；
B vertical survey method
The same time carries out squareness measurement in the morning, reduces influence of the sunshine to squareness measurement precision；And by solid
Fixed measurement construction personnel controls the human error of measurement accuracy；Using laser optical method, instrument is using laser vertical instrument or swashs
Light theodolite；Three class control point passes through measurement preformed hole pilot measurement to operation by ± 0.00 floor laser vertical instrument by stairwell
Then layer is thrown using theodolite and surveys cross control axis by stairwell, measured hole preformed hole is 200 ╳ 200；
C throws the measuring point measured on operation platform, and position number was 1 survey time, and mean square error of angle observation is ± 8 " between, quadrangle right angle
Error is at 90 ° ± 10 " between, span error be 1:20000, cross axle line endpoints error under ±2 mm, quadrangle angle point error ±
3mm, since floor surface concrete has Planar Contraction phenomenon, when measuring length, side length is not less than design length；
The d measurement of higher degree
1. elevation Fixed Initial Point
Vertical control network line of level is pressed annular mis-tie misclosure and is calculated, and every km measurement of the level mis-tie misclosure is calculated by formula (1):
In formula (1): MW is mis-tie misclosure, and L is path length；
2. absolute altitude is arranged
Using bench mark pilot measurement to the datum grade of underground three as subsurface level pilot measurement foundation；After building goes out ground, with
Bench mark is critically in elevation pilot measurement to first floor outline border trestle, as upward pilot measurement height datum point, and and subsurface level into
Row tie-in；
3. vertical vertical control survey method
With the first floor ,+1.000m, as upward pilot measurement foundation:
Steel ruler measures pilot measurement method: after exterior frame column form removable, the preceding paragraph layer is vertically measured along pillar for concrete every one layer of construction
Rise is from as next layer of elevation setting-out foundation, checking absolute altitude by checking point, the two with the calibration of Red Triangle region mark
Error is no more than 2mm；
Vertical telemetry: it every 20 meters with steel ruler method pilot measurement absolute altitude is suspended in midair, eliminates and is surveyed as caused by inclination and verticality
Measure error；Vertical ranging adds bend pipe using total station, measures longer section and hangs down away from control steel ruler measures cumulative errors paragraph by paragraph, checks
The absolute altitude being already provided on the borehole wall；On floor vertical measurement hole, total station is set up using point height known on wall and measures instrument
Device view is high, then measures to receiving station prism and hangs down away from prism mirror surface is downward, and founds levelling rod on prism bases, and absolute altitude is arranged
Mark；
Trigonometric Leveling: elevational point is acquired on floor face: at the ground of nearly BM bench mark, whole station is set
Instrument, with the mark post of two root device prisms, one (bar 1) is stood on BM bench mark, and one (bar 2) is stood in required point, is surveyed respectively
Out instrument to BM bench mark and required point height difference hl and h2, can calculate required point elevation；When measurement, the vertical rib in two places
When mirror absolute altitude is consistent:
HN1=BM1+h2-h1 (2)
In formula (2), HN1 is prism absolute altitude, and BM1 is elevation, and hl is instrument to BM bench mark height difference, and h2 is instrument to required
Point height difference；If instrument to BM bench mark measures negative height difference, sign-alternating number is "+" before hl.
When two bars height is inconsistent, such as: when bar 2 is greater than the difference of bar 1, then the height difference of two bars subtracts this difference, no
Then it is added.Specific aim measurement scheme is specifically done according to construction node for area city accurate measurement and monomer close mapping and executes operation.
Claims (1)
1. a kind of distribution method of SURVEYING CONTROL NETWORK, which comprises the following steps:
1) laying at general layout control net control point
The point cross small arc shaped frame set will be surveyed and control point, bury pre-cast concrete stake in control point；Pre-cast concrete stake by
Reinforcing bar casting concrete is made, and reinforcing bar is the reinforcing bar of diameter 30mm or more, and upper end polishes, in delineation cross hairs above as mark
Point, lower end hooking, is poured among concrete；Stake top is not less than stake having a size of 150mm × 150mm, stake bottom size
Push up size；After hole position has been dug, wherein by concrete stake perfusion, before the cement has set, adjustment reinforcement location is controlled with portal frame
Onto origin position；
2) measure axis of underground
Theodolite is erected on the axial line control stake position of margin of foundation pit；After centering, leveling, backsight same direction stake, by institute
On the axis projection to the plane layer of construction needed；The longitudinal and transverse axis for throwing survey on the same layer is respectively no less than two；Make angle with this
The check of degree, distance；After check is errorless, other corresponding axis and thin portion line are released on this plane；In the axis of each floor
During line throws survey, the vertical vertical shift of the axis of upper and lower level must not exceed 2mm；
3) measurement of superstructure engineering
The control points layout of main part: calculating the X, Y coordinates of horizontal control point according to the X, Y coordinates that drawing gives, and utilizes
The review at total station progress control point；
A hangs down quasi- pilot measurement method
Construction survey precision is influenced big, increase construction survey datum layer, reduction laser alignment by structure self-vibration, wind shake, sunshine
Height is surveyed in the throwing of instrument, and is transmitted by measuring basis layer, and dynamic measuring data is handled, and eliminates structure self-vibration, wind shake to construction
The influence of measurement accuracy；
Measure control point should every layer of at least two control point, two control point height differences are not more than 15 meters, carry out main building construction layer and room
When planar survey, the vertical transmitting and converting of datum mark is controlled, reduces the influence thrown and survey excessive height to construction survey precision；
B vertical survey method
The same time carries out squareness measurement in the morning, reduces influence of the sunshine to squareness measurement precision；And pass through fixation
Measure the human error that construction personnel controls measurement accuracy；Using laser optical method, instrument is passed through using laser vertical instrument or laser
Latitude instrument；By stairwell three class control point by ± 0.00 floor with laser vertical instrument by measurement preformed hole pilot measurement to operation layer, so
It is thrown afterwards using theodolite and surveys cross control axis by stairwell；
C throws the measuring point measured on operation platform, and position number was 1 survey time, and mean square error of angle observation is ± 8 " between, quadrangle right angle error
At 90 ° ± 10 " between, span error be 1:20000, cross axle line endpoints error under ±2 mm, quadrangle angle point error ± 3mm, by
There is Planar Contraction phenomenon in floor surface concrete, when measuring length, side length is not less than design length；
The d measurement of higher degree
1. elevation Fixed Initial Point
Vertical control network line of level is pressed annular mis-tie misclosure and is calculated, and every km measurement of the level mis-tie misclosure is calculated by formula (1):
In formula (1): MW is mis-tie misclosure, and L is path length；
2. absolute altitude is arranged
Using bench mark pilot measurement to the datum grade of underground three as subsurface level pilot measurement foundation；After building goes out ground, with level
Point is connected critically in elevation pilot measurement to first floor outline border trestle as upward pilot measurement height datum point, and with subsurface level
It surveys；
3. vertical vertical control survey method
With the first floor ,+1.000m, as upward pilot measurement foundation:
Steel ruler measures pilot measurement method: after exterior frame column form removable, the preceding paragraph layer rise is vertically measured along pillar for concrete every one layer of construction
From, it is put by review and absolute altitude is checked as next layer of elevation setting-out foundation with the calibration of Red Triangle region mark, the two error
No more than 2mm；
Vertical telemetry: it every 20 meters with steel ruler method pilot measurement absolute altitude is suspended in midair, eliminates and measures mistake as caused by inclination and verticality
Difference；Vertical ranging adds bend pipe using total station, measures longer section and hangs down away from control steel ruler measures cumulative errors paragraph by paragraph, and inspection has been set
Set the absolute altitude on the borehole wall；On floor vertical measurement hole, total station is set up, using point height known on wall, measures instrument view
Then height is measured to receiving station prism and is hung down away from prism mirror surface is downward, and founds levelling rod on prism bases, and bench mark is arranged；
Trigonometric Leveling: elevational point is acquired on floor face: at the ground of nearly BM bench mark, total station being set, is used
The mark post of two root device prisms, one is stood on BM bench mark, and one is stood in required point, measures instrument respectively to BM bench mark
With the height difference hl and h2 of required point, can calculate required point elevation；When measurement, when the vertical prism absolute altitude in two places is consistent:
HN1=BM1+h2-h1 (2)
In formula (2), HN1 is prism absolute altitude, and BM1 is elevation, and hl is instrument to BM bench mark height difference, and h2 is instrument to required point height
Difference；If instrument to BM bench mark measures negative height difference, sign-alternating number is "+" before hl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811402990.6A CN109443327A (en) | 2018-11-23 | 2018-11-23 | A kind of distribution method of SURVEYING CONTROL NETWORK |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811402990.6A CN109443327A (en) | 2018-11-23 | 2018-11-23 | A kind of distribution method of SURVEYING CONTROL NETWORK |
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| Publication Number | Publication Date |
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| CN109443327A true CN109443327A (en) | 2019-03-08 |
Family
ID=65553501
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| CN201811402990.6A Pending CN109443327A (en) | 2018-11-23 | 2018-11-23 | A kind of distribution method of SURVEYING CONTROL NETWORK |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109914831A (en) * | 2019-04-19 | 2019-06-21 | 中建八局第四建设有限公司 | A kind of PC point appraises and decides device |
| CN110704923A (en) * | 2019-09-27 | 2020-01-17 | 云南齐星杭萧钢构股份有限公司 | Building site construction method and device based on BIM |
| CN110849338A (en) * | 2019-12-05 | 2020-02-28 | 散裂中子源科学中心 | Control network measuring method |
| CN113188510A (en) * | 2021-03-10 | 2021-07-30 | 浙江省建工集团有限责任公司 | Construction method for new triangular elevation measurement in large-area deep foundation pit |
| CN114018225A (en) * | 2021-10-13 | 2022-02-08 | 北京城建建设工程有限公司 | Ultra-large square construction measurement control method |
| CN115683016A (en) * | 2022-09-17 | 2023-02-03 | 中建五局土木工程有限公司 | A method for precise setting out of equipment foundations in underground closed spaces |
-
2018
- 2018-11-23 CN CN201811402990.6A patent/CN109443327A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109914831A (en) * | 2019-04-19 | 2019-06-21 | 中建八局第四建设有限公司 | A kind of PC point appraises and decides device |
| CN109914831B (en) * | 2019-04-19 | 2024-02-23 | 中建八局第四建设有限公司 | A kind of PC point checker |
| CN110704923A (en) * | 2019-09-27 | 2020-01-17 | 云南齐星杭萧钢构股份有限公司 | Building site construction method and device based on BIM |
| CN110849338A (en) * | 2019-12-05 | 2020-02-28 | 散裂中子源科学中心 | Control network measuring method |
| CN113188510A (en) * | 2021-03-10 | 2021-07-30 | 浙江省建工集团有限责任公司 | Construction method for new triangular elevation measurement in large-area deep foundation pit |
| CN113188510B (en) * | 2021-03-10 | 2022-05-27 | 浙江省建工集团有限责任公司 | Construction method for new triangular elevation measurement in large-area deep foundation pit |
| CN114018225A (en) * | 2021-10-13 | 2022-02-08 | 北京城建建设工程有限公司 | Ultra-large square construction measurement control method |
| CN114018225B (en) * | 2021-10-13 | 2023-05-26 | 北京城建建设工程有限公司 | Ultra-large square construction measurement control method |
| CN115683016A (en) * | 2022-09-17 | 2023-02-03 | 中建五局土木工程有限公司 | A method for precise setting out of equipment foundations in underground closed spaces |
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Application publication date: 20190308 |