CN107620241A - A kind of water-permeable brick and its production technology - Google Patents
A kind of water-permeable brick and its production technology Download PDFInfo
- Publication number
- CN107620241A CN107620241A CN201710936032.6A CN201710936032A CN107620241A CN 107620241 A CN107620241 A CN 107620241A CN 201710936032 A CN201710936032 A CN 201710936032A CN 107620241 A CN107620241 A CN 107620241A
- Authority
- CN
- China
- Prior art keywords
- permeable
- particle
- water
- stress frame
- iron tailings
- 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
Links
- 239000011449 brick Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title claims abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 125
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 98
- 229910052742 iron Inorganic materials 0.000 claims abstract description 49
- 239000002344 surface layer Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002893 slag Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000000839 emulsion Substances 0.000 claims abstract description 18
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 18
- 238000012423 maintenance Methods 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims description 21
- 238000010790 dilution Methods 0.000 claims description 10
- 239000012895 dilution Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000007873 sieving Methods 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of water-permeable brick and its production technology.Mainly it is to solve the problem of existing water-permeable brick service life is short, and water permeability is poor, and production cost is high and invent.Water-permeable brick includes stress frame, and the permeable particle of bottom and the permeable particle of surface layer are filled in stress frame；The bottom of stress frame sets side osculum, and the permeable particle bottom of bottom sets guiding gutter.By cement, iron tailings powder, it is broken after iron tailings slag, water be well mixed, stress frame is made with brickmaking machine；The permeable particle of surface layer and the permeable particle of bottom are made, iron tailings slag is put into shaking tray machine and rotated, while PVAC emulsions are sprayed to iron tailings slag, spraying cement, iron tailings powder, water again, shaking tray machine is rotated further, and material is bonded together as graininess, sieving, mould is set in stress frame inner bottom part, the permeable particle of bottom is encased in stress frame, refills the permeable particle of surface layer, is vibrated, it is static, maintenance.Advantage is service life length, and water permeability is good, and production cost is low.
Description
Technical field：
The present invention relates to building material field, is specifically related to a kind of water-permeable brick and its production technology.
Background technology：
Existing water-permeable brick is to be suppressed or bonded by permeable particle to form, and it has following weak point：The outdoor long-term rain of laying
Leaching（Freeze thawing）, roll and easily come off, be recessed, service life is short；Resistance to compression and bending strength is low, wear-resisting low intensity；The impurity such as mud
The gap of permeable particle is easily blocked, influences water permeability, it is not easy to clean.
In addition, the industrial tailings such as substantial amounts of iron tailings slag and building waste be present now, if being used production
Water-permeable brick, twice laid can be realized, reduce the pollution to environment, and can reduces the production cost of water-permeable brick.
The content of the invention：
The technical problems to be solved by the invention are to provide a kind of intensity height, and permeable particle is difficult for drop-off, service life length, draining
Unobstructed, self-cleaning function is strong, and water permeability is good, the low water-permeable brick of production cost and its production technology.
What above-mentioned purpose was realized in：Described water-permeable brick includes stress frame, and the lower half in stress frame is filled out
The permeable particle of bottom is filled, the permeable particle of surface layer is filled in the stress frame above the permeable particle of bottom, described surface layer is permeable
The particle diameter of particle is less than the particle diameter of the permeable particle of bottom；Several side osculums are set in the bottom of stress frame, it is permeable in bottom
The bottom of particle sets guiding gutter.
Protection rib can also be set in stress frame, the both ends of the protection rib are all fixed on stress frame.
The particle diameter of the permeable particle of described surface layer is between 3mm-6mm, and the particle diameter of the permeable particle of described bottom is in 7mm-
Between 10mm.
The production technology of water-permeable brick：
Stress frame is made first, and raw material is：Cement, iron tailings powder, it is broken after iron tailings slag or building waste, water, wherein
Cement accounts for 20-the 30% of material total amount, and iron tailings powder accounts for 10-the 20% of material total amount, iron tailings slag or building rubbish after crushing
Rubbish accounts for 40-the 60% of material total amount, and water accounts for 10-the 15% of material total amount；They are well mixed, stress frame is made with brickmaking machine
Frame；
Then the preparation method phase of the permeable particle of surface layer and the permeable particle of bottom, the permeable particle of surface layer and the permeable particle of bottom is made
Together；
First PVAC emulsions are diluted with 5 times of water, then iron tailings slag or it is broken after building waste be put into shaking tray machine transfer
It is dynamic, at the same into iron tailings slag or it is broken after building waste injection dilution after PVAC emulsions, then spraying cement and iron tailings powder,
Spray water again, shaking tray machine is rotated further, and material is bonded together as graininess, is then sieved, particle diameter is between 3mm-6mm
For the permeable particle of surface layer, between 7mm-10mm for the permeable particle of bottom.
Bottom in stress frame sets circular dies, and first the permeable particle of bottom is encased in stress frame, then will
The permeable particle of surface layer is encased in the top of the permeable particle of bottom, vibration, static, maintenance.
The weight ratio of each raw material of the permeable particle is：Iron tailings slag or broken rear building waste：Iron tailings powder：Water
Mud：Water：PVAC emulsion=60-70 after dilution：10-20：20—30：5-10:3—5.
It is an advantage of the invention that：Due to being located at provided with stress frame and protection rib, permeable particle in stress frame, effectively drop
The low extraneous friction between permeable particle, so the compression strength and bending strength of water-permeable brick can be improved, it is ensured that permeable particle
Do not fall off, increase the service life.Due to setting side osculum in the bottom of stress frame, water guide is set in the bottom of the permeable particle of bottom
Groove, water-permeable brick at work, can form mighty torrent, make draining more unobstructed, realize self-cleaning function, while can also effectively avoid in the winter
The freeze thawing damage that season is formed because aqueous.Because the particle diameter of the permeable particle of surface layer is less than the particle diameter of the permeable particle of bottom, so can
The blocking for avoiding the impurity such as mud from being formed, ensure that water permeability.
Due to having used substantial amounts of iron tailings powder and iron tailings slag or broken rear building waste, twice laid can be realized,
The pollution to environment is reduced, and can reduces the production cost of water-permeable brick.
Brief description of the drawings：
Fig. 1 is the main structure diagram of water-permeable brick in the present invention；
Fig. 2 is the overlooking the structure diagram of water-permeable brick in the present invention.
Embodiment：
Referring to Figures 1 and 2, described water-permeable brick includes stress frame 1, permeable of the bottom of lower half filling in stress frame
Grain 2, the permeable particle 3 of surface layer, the particle diameter of the permeable particle of described surface layer are filled in the stress frame above the permeable particle of bottom
Less than the particle diameter of the permeable particle of bottom；Several side osculums 4 are set in the bottom of stress frame, in the bottom of the permeable particle of bottom
If guiding gutter 5.
Protection rib 6 can also be set in stress frame, the both ends of the protection rib are all fixed on stress frame.
The particle diameter of the permeable particle of described surface layer is between 3mm-6mm, and the particle diameter of the permeable particle of described bottom is in 7mm-
Between 10mm.
The production technology of water-permeable brick：
Stress frame is made first, and raw material is：Cement, iron tailings powder, it is broken after iron tailings slag or building waste, water, wherein
Cement accounts for 20-the 30% of material total amount, and iron tailings powder accounts for 10-the 20% of material total amount, iron tailings slag or building rubbish after crushing
Rubbish accounts for 40-the 60% of material total amount, and water accounts for 10-the 15% of material total amount；They are well mixed, stress frame is made with brickmaking machine
Frame, several side osculums are opened on stress frame；
Then the preparation method phase of the permeable particle of surface layer and the permeable particle of bottom, the permeable particle of surface layer and the permeable particle of bottom is made
Together；
First PVAC emulsions are diluted with 5 times of water, then iron tailings slag or it is broken after building waste be put into shaking tray machine transfer
It is dynamic, at the same into iron tailings slag or it is broken after building waste injection dilution after PVAC emulsions, then spraying cement and iron tailings powder,
Spray water again, shaking tray machine is rotated further, and material is bonded together as graininess, is then sieved, particle diameter is between 3mm-6mm
For the permeable particle of surface layer, between 7mm-10mm for the permeable particle of bottom.
Bottom in stress frame sets circular dies, and first the permeable particle of bottom is encased in stress frame, then will
The permeable particle of surface layer is encased in the top of the permeable particle of bottom, vibration, static, maintenance.
The weight ratio of each raw material of the permeable particle is：Iron tailings slag or broken rear building waste：Iron tailings powder：Water
Mud：Water：PVAC emulsion=60-70 after dilution：10-20：20—30：5-10:3—5.
Embodiment 1,
Stress frame is made first, and raw material is：20 kilograms of cement, 15 kilograms of iron tailings powder, 50 kilograms of iron tailings slag, water 15 are public
Jin, they are well mixed, stress frame is made with brickmaking machine, several side osculums are opened on stress frame；
Then the preparation method phase of the permeable particle of surface layer and the permeable particle of bottom, the permeable particle of surface layer and the permeable particle of bottom is made
Together；
First PVAC emulsions are diluted with 5 times of water, then 60 kilograms of iron tailings slag is put into shaking tray machine and rotated, while to iron
3 kilograms of PVAC emulsions in mine tailings after injection dilution, then 10 kilograms of 20 kilograms of spraying cement and iron tailings powder, then spray water 5 kilograms,
Shaking tray machine is rotated further, and material is bonded together as graininess, is then sieved, particle diameter between 3mm-6mm for surface layer
Permeable particle, between 7mm-10mm for the permeable particle of bottom.
Bottom in stress frame sets circular dies, and first the permeable particle of bottom is encased in stress frame, then will
The permeable particle of surface layer is encased in the top of the permeable particle of bottom, vibration, static, maintenance.
Embodiment 2,
Stress frame is made first, and raw material is：30 kilograms of cement, 20 kilograms of iron tailings powder, 40 kilograms of iron tailings slag, water 10 are public
Jin, they are well mixed, stress frame is made with brickmaking machine, several side osculums are opened on stress frame；
Then the preparation method phase of the permeable particle of surface layer and the permeable particle of bottom, the permeable particle of surface layer and the permeable particle of bottom is made
Together；
First PVAC emulsions are diluted with 5 times of water, then 63 kilograms of iron tailings slag is put into shaking tray machine and rotated, while to iron
4 kilograms of PVAC emulsions in mine tailings after injection dilution, then 14 kilograms of 23 kilograms of spraying cement and iron tailings powder, then spray water 7 kilograms,
Shaking tray machine is rotated further, and material is bonded together as graininess, is then sieved, particle diameter between 3mm-6mm for surface layer
Permeable particle, between 7mm-10mm for the permeable particle of bottom.
Bottom in stress frame sets circular dies, and first the permeable particle of bottom is encased in stress frame, then will
The permeable particle of surface layer is encased in the top of the permeable particle of bottom, vibration, static, maintenance.
Embodiment 3,
Stress frame is made first, and raw material is：20 kilograms of cement, 10 kilograms of iron tailings powder, it is broken after 60 kilograms of building waste,
10 kilograms of water, they are well mixed, and stress frame is made with brickmaking machine；
Then the preparation method phase of the permeable particle of surface layer and the permeable particle of bottom, the permeable particle of surface layer and the permeable particle of bottom is made
Together；
First PVAC emulsions are diluted with 5 times of water, then the building waste after 67 kilograms broken is put into shaking tray machine and rotated,
4 kilograms of the PVAC emulsions into the building waste after crushing after injection dilution simultaneously, then 28 kilograms of spraying cement and iron tailings powder 18
Kilogram, then spray water 10 kilograms, shaking tray machine is rotated further, and material is bonded together as graininess, is then sieved, particle diameter exists
Between 3mm-6mm for the permeable particle of surface layer, between 7mm-10mm for the permeable particle of bottom.
Bottom in stress frame sets circular dies, and first the permeable particle of bottom is encased in stress frame, then will
The permeable particle of surface layer is encased in the top of the permeable particle of bottom, vibration, static, maintenance.
Embodiment 4,
Stress frame is made first, and raw material is：25 kilograms of cement, 10 kilograms of iron tailings powder, it is broken after 50 kilograms of building waste,
15 kilograms of water, they are well mixed, and stress frame is made with brickmaking machine, and several side osculums are opened on stress frame；
Then the preparation method phase of the permeable particle of surface layer and the permeable particle of bottom, the permeable particle of surface layer and the permeable particle of bottom is made
Together；
First PVAC emulsions are diluted with 5 times of water, then the building waste after 70 kilograms broken is put into shaking tray machine and rotated,
5 kilograms of the PVAC emulsions into the building waste after crushing after injection dilution simultaneously, then 30 kilograms of spraying cement and iron tailings powder 20
Kilogram, then spray water 10 kilograms, shaking tray machine is rotated further, and material is bonded together as graininess, is then sieved, particle diameter exists
Between 3mm-6mm for the permeable particle of surface layer, between 7mm-10mm for the permeable particle of bottom.
Bottom in stress frame sets circular dies, and first the permeable particle of bottom is encased in stress frame, then will
The permeable particle of surface layer is encased in the top of the permeable particle of bottom, vibration, static, maintenance.
Claims (5)
1. a kind of water-permeable brick, it is characterized in that：Including stress frame（1）, permeable of the bottom of lower half filling in stress frame
Grain（2）, the permeable particle of surface layer is filled in the stress frame above the permeable particle of bottom（3）, the permeable particle of described surface layer
Particle diameter is less than the particle diameter of the permeable particle of bottom；Several side osculums are set in the bottom of stress frame（4）, in the permeable particle of bottom
Bottom set guiding gutter（5）.
2. according to the water-permeable brick described in claim 1, it is characterized in that：Protection rib is set in stress frame（6）, the protection rib
Both ends are all fixed on stress frame.
3. according to the water-permeable brick described in claim 1 or 2, it is characterized in that：The particle diameter of the permeable particle of described surface layer is in 3mm-6mm
Between, the particle diameter of the permeable particle of described bottom is between 7mm -10mm.
4. a kind of production technology of water-permeable brick, it is characterized in that：Stress frame is made first, and raw material is：Cement, iron tailings powder, break
Iron tailings slag or building waste, water after broken, wherein cement account for 20-the 30% of material total amount, and iron tailings powder accounts for material total amount
10-20%, iron tailings slag or building waste after crushing account for 40-the 60% of material total amount, and water accounts for 10-the 15% of material total amount；
They are well mixed, stress frame is made with brickmaking machine, several side osculums are opened on stress frame；
Then the preparation method phase of the permeable particle of surface layer and the permeable particle of bottom, the permeable particle of surface layer and the permeable particle of bottom is made
Together；
First PVAC emulsions are diluted with 5 times of water, then iron tailings slag or it is broken after building waste be put into shaking tray machine transfer
It is dynamic, at the same into iron tailings slag or it is broken after building waste injection dilution after PVAC emulsions, then spraying cement and iron tailings powder,
Spray water again, shaking tray machine is rotated further, and material is bonded together as graininess, is then sieved, particle diameter is between 3mm-6mm
For the permeable particle of surface layer, between 7mm-10mm for the permeable particle of bottom；
Bottom in stress frame sets circular dies, and first the permeable particle of bottom is encased in stress frame, then by surface layer
Permeable particle is encased in the top of the permeable particle of bottom, vibration, static, maintenance.
5. according to the production technology of the water-permeable brick described in claim 4, it is characterized in that：Make the weight of each raw material of permeable particle
Than for：Iron tailings slag or broken rear building waste：Iron tailings powder：Cement：Water：PVAC emulsion=60-70 after dilution：10-20：
20—30：5-10:3—5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710936032.6A CN107620241A (en) | 2017-10-10 | 2017-10-10 | A kind of water-permeable brick and its production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710936032.6A CN107620241A (en) | 2017-10-10 | 2017-10-10 | A kind of water-permeable brick and its production technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107620241A true CN107620241A (en) | 2018-01-23 |
Family
ID=61090289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710936032.6A Pending CN107620241A (en) | 2017-10-10 | 2017-10-10 | A kind of water-permeable brick and its production technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107620241A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111056801A (en) * | 2019-12-30 | 2020-04-24 | 攀钢冶金材料有限责任公司 | Water permeable brick and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029809A (en) * | 2000-07-10 | 2002-01-29 | Shiima Consultant:Kk | Water permeable block and manufacturing method of the same |
| US20110211908A1 (en) * | 2010-02-26 | 2011-09-01 | Vulcan Materials Company | Traffic bearing structure with permeable pavement |
| CN105801050A (en) * | 2016-03-01 | 2016-07-27 | 中国十七冶集团有限公司 | Dual-layered iron tailing sand-based water permeable brick and preparation method thereof |
| CN105803879A (en) * | 2015-01-20 | 2016-07-27 | 生态顶级株式会社 | Block for roads, road paving structure using same, and method of constructing said structure |
| CN106917342A (en) * | 2015-12-24 | 2017-07-04 | 天津裕丰源环保科技有限公司 | A kind of waste stone dust infiltration floor tile |
| CN107188497A (en) * | 2017-06-29 | 2017-09-22 | 承德德厦新型建材有限公司 | A kind of water-permeable brick and preparation method |
| CN207567592U (en) * | 2017-10-10 | 2018-07-03 | 辽宁建筑职业学院 | A kind of water-permeable brick |
-
2017
- 2017-10-10 CN CN201710936032.6A patent/CN107620241A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029809A (en) * | 2000-07-10 | 2002-01-29 | Shiima Consultant:Kk | Water permeable block and manufacturing method of the same |
| US20110211908A1 (en) * | 2010-02-26 | 2011-09-01 | Vulcan Materials Company | Traffic bearing structure with permeable pavement |
| CN105803879A (en) * | 2015-01-20 | 2016-07-27 | 生态顶级株式会社 | Block for roads, road paving structure using same, and method of constructing said structure |
| CN106917342A (en) * | 2015-12-24 | 2017-07-04 | 天津裕丰源环保科技有限公司 | A kind of waste stone dust infiltration floor tile |
| CN105801050A (en) * | 2016-03-01 | 2016-07-27 | 中国十七冶集团有限公司 | Dual-layered iron tailing sand-based water permeable brick and preparation method thereof |
| CN107188497A (en) * | 2017-06-29 | 2017-09-22 | 承德德厦新型建材有限公司 | A kind of water-permeable brick and preparation method |
| CN207567592U (en) * | 2017-10-10 | 2018-07-03 | 辽宁建筑职业学院 | A kind of water-permeable brick |
Non-Patent Citations (4)
| Title |
|---|
| 万辉: "《复合材料 第2版》", 31 March 2017, 哈尔滨工业大学出版社 * |
| 李德忠等: "铁尾矿制备高强高性能透水砖", 《新型建筑材料》 * |
| 水浩然: "《小区雨水收集利用规划与设计》", 30 June 2016, 中国建材工业出版社 * |
| 韩葳蕤等: "新型透水砖设计及制备方法研究", 《山西建筑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111056801A (en) * | 2019-12-30 | 2020-04-24 | 攀钢冶金材料有限责任公司 | Water permeable brick and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105198257A (en) | Construction waste crushing and screening line method | |
| CN107620241A (en) | A kind of water-permeable brick and its production technology | |
| CN206477355U (en) | A kind of retaining wall for hydraulic engineering | |
| CN204412325U (en) | A kind of Weight type concrete pulverizer | |
| CN207210883U (en) | A kind of anti-blocking water storage permeable brick | |
| CN204412428U (en) | A kind of Vehicular concrete reclaims, reducing mechanism | |
| CN207331386U (en) | New Municipal Road Engineering roadbed | |
| CN204849510U (en) | What be adapted to gardens and residential quarter prevents accumulation of salt in surface soil pavement structure | |
| CN209293149U (en) | A kind of water discharging structure of anti-floating building bottom plate | |
| CN203755340U (en) | Retaining wall structure of pervious concrete through cut | |
| CN207567592U (en) | A kind of water-permeable brick | |
| CN206704959U (en) | A kind of Anti-blockage regeneration cold burden storehouse | |
| CN206828957U (en) | A kind of U-shaped water guide blind pipe under dewatering and noise reduction road surface | |
| CN108560347B (en) | Roadbed filling construction method adopting iron ore tailing powder as main material | |
| CN207672352U (en) | A kind of Anti-settling device of highway subgrade | |
| CN206844394U (en) | A kind of vertical connecting node of precast shear wall | |
| CN206928539U (en) | Stair sliding hinge end mounting structure | |
| CN214941766U (en) | Waterproof double-T-plate roof | |
| CN205558923U (en) | A unloading pipe for deep tunnel construction | |
| CN205604743U (en) | Floor entrance to a cave watertight fittings is worn to tower crane | |
| CN205324180U (en) | Super high earth -rock dam soil stone classification device | |
| CN205576678U (en) | Resistance to compression grass planting brick | |
| CN214551766U (en) | Efficient iron fine powder bin bottom water seepage system | |
| CN219081181U (en) | Tower crane skirt house and basement foundation rainproof structure | |
| CN203451968U (en) | High-slope intercepting ditch structure of road |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180123 |
|
| RJ01 | Rejection of invention patent application after publication |