CN104452690A - Concrete roughing pier flexible apron structure and construction method - Google Patents
Concrete roughing pier flexible apron structure and construction method Download PDFInfo
- Publication number
- CN104452690A CN104452690A CN201410737993.0A CN201410737993A CN104452690A CN 104452690 A CN104452690 A CN 104452690A CN 201410737993 A CN201410737993 A CN 201410737993A CN 104452690 A CN104452690 A CN 104452690A
- Authority
- CN
- China
- Prior art keywords
- apron
- concrete
- pier
- rough
- piecemeal
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a concrete roughing pier flexible apron structure. The concrete roughing pier flexible apron structure comprises concrete apron sub-blocks which are paved on a sandy gravel cushion layer at the downstream tail end of an absorption basin of a water release structure, wherein the concrete apron sub-blocks are spliced with each other; gap partition plates are arranged in gaps of the concrete apron sub-blocks; roughing piers which are distributed in quincunx shape are arranged at the tops of the concrete apron sub-blocks; every two concrete apron sub-blocks are connected through a hinge steel bar in a manner of passing through the gap partition plates. The concrete roughing pier flexible apron structure is simple in structure and reliable in technology, and is economical and practical; by virtue of the concrete roughing pier flexible apron structure, the problem of stability of the apron which is built on a thick and deep sandy gravel covering layer riverbed when the release water flow is high in unit-width flow and high in flow rate and the riverbed has a low anti-scouring capability and unevenly settles can be solved; the overall stability of the apron and the long-term safety of the absorption basin and the water release structure can be ensured. The invention also discloses a construction method of the concrete roughing pier flexible apron structure.
Description
Technical field
The present invention relates to hydro-structure field, refer to that a kind of concrete adds the flexible apron structure of rough pier and construction method particularly.
Background technology
The low water head hydraulic engineerings such as the more gate dam of China are built on deep covering layer riverbed, add that China's major part river belongs to fully-loaded stream, during flood, current silt carrying capacity is larger, when the low water head Lower Hydraulic Structure depth of waters such as gate dam are more shallow, behind dam, energy dissipation by hydraulic jump efficiency is low, after absorption basin is flowed out in lower sluicing, flow velocity is still comparatively large, due to sandy gravel bed downcutting and erosion resistibility poor, lower sluicing is flowed long-term souring and is caused adverse effect by the stability of underwater bed fast.At present, wash away impact in order to what reduce that the lower stream that sluices causes underwater bed after the low water head hydraulic structures such as gate dam, generally take to form apron structure at absorption basin downstream concreting layer.But use existing apron structure, the lower fast sluicing that sand content is large flows through washes away for a long time, and underwater bed can produce comparatively favourable opposition hole, and apron there will be sedimentation uneven phenomenon, and then destroys apron structure, makes it be difficult to repair simultaneously.Apron structure is once destroyed, and souring can continue to destroy absorption basin, then threatens the safety of water retaining structure.
Summary of the invention
The object of the invention is to the weak point overcoming above-mentioned existing background technology, research and develop a kind of concrete and add the flexible apron structure of rough pier and construction method, it is low that it mainly solves Low Froude numbers energy dissipation by hydraulic jump efficiency, after water flows out absorption basin, flow velocity is large, and lower sluicing stream sand content is large, and after absorption basin sandy gravel covering layer bed downcutting and erosion resistibility poor, the safety problem that the lower stream that sluices connects between diffusion with concrete apron piecemeal further on concrete apron.Present invention achieves the fast lower stream further energy dissipating on concrete apron that sluices that sand content is large, and can not make to build yielding concrete apron itself on sandy gravel riverbed and destroy.
For achieving the above object, concrete designed by the present invention adds the flexible apron structure of rough pier, comprise the concrete apron piecemeal on the sand-stone cushion being laid on outlet structure escape works absorption basin downstream tail end, described concrete apron piecemeal splices mutually, space plate is provided with in gap therebetween, its special character is, described concrete apron piecemeal top is provided with and adds rough pier in quincuncial arrangement, is connected between every two described concrete apron piecemeals by hinge reinforcing bar through space plate.
Further, described hinge reinforcing bar is two, crosses through space plate, and the external part at its two anchors into two concrete apron piecemeals respectively.Hinge reinforcing bar is adopted to cross through the mode of space plate connection concrete apron piecemeal, make to be formed between two concrete apron piecemeals to flexibly connect, apron structure is made to be linked as flexible integral, there is the effect formed on soft base compared with severe deformation ability and erosion resistibility, can the globality of long-time effective guarantee apron structure.
Further, the thick 50 ~ 100cm of described concrete apron piecemeal, described in add rough pier height be 20 ~ 40cm, interval is arranged, flowing to spacing is downstream 150 ~ 200cm, and it is 100 ~ 150cm that vertical water flows to spacing.According to the lower flow velocity of stream and the size of scouring force of sluicing, add rough pier and arrange too low, have little effect, arrange too high, will flood be hindered and increase construction cost.
Further, the intersecting angle of described two hinge reinforcing bars is 30 ~ 50 °, and the length that two ends anchor into concrete apron piecemeal is 80 ~ 120cm, spacing 40 ~ 70cm, makes to form flexibly connecting of high strength between two block concrete apron piecemeals.
Further, add rough mop described in and be placed in the long concrete apron piecemeal top of apron structure anterior 1/2 or 1/3.In apron structure near absorption basin on one side before 1/2 or 1/3 area concrete apron piecemeal on arrange and add rough pier because away from absorption basin concrete apron piecemeal suffered by scouring force significantly cut down.
Further, described space plate is pitch deals or ethylene closed cell cystosepiment, and its good endurance, easy construction, cost are lower.
Further, described concrete apron piecemeal is square structure, and the length of side is 400 ~ 600cm, and the excessive easy generation crack of specification of concrete apron piecemeal, specification is too small, and poor stability, construction cost increase.
Further, described in add rough pier corner be set to chamfering, make the corner adding rough pier not easily by the long-term silt carrying capacity lower stream erosion damage that sluices greatly fast, keep the integrality adding rough pier.
Concrete adds a construction method for the flexible apron structure of rough pier, comprises the steps:
1) sand-stone cushion is laid excavating on the basis handled well;
2) prepare described hinge reinforcing bar, antirust treatment is carried out to the middle part of described hinge reinforcing bar;
3) set up described concrete apron piecemeal template and add rough pier template, and burying hinge reinforcing bar underground in described concrete apron piecemeal surrounding;
4) build described concrete apron piecemeal and add rough pier;
5) concrete curing is carried out after having built described concrete apron piecemeal and having added rough pier;
6) by described concrete apron piecemeal with to add rough pier removing surface clean, after dry tack free, lay space plate in the surrounding of described concrete apron piecemeal, complete the construction of a concrete apron piecemeal;
7) step 3 is repeated) ~ 6), until complete all concrete apron piecemeals in apron structure.
Preferably, described step 2) in antirust treatment carries out to the middle part of described hinge reinforcing bar method be middle 20cm scope brush rustproof paint to described hinge reinforcing bar, and pitching ointment.
The present invention proposes a kind of flexible concrete apron, impact resistance is set after absorption basin (protection-apron), adapts to the flexible apron of the strong concrete of foundation deformation ability and establish on apron add rough pier, the lower stream that sluices fast is made to continue to dissipate, further abatement flow rate of water flow, reach control range, establish high strength hinge reinforcing bar to ensure the stable of apron structure itself, in order to avoid affect absorption basin (protection-apron) the even safety of water retaining structure between concrete apron piecemeal simultaneously.
The invention has the advantages that: structure is simple, technically reliable, economical and practical, concrete apron structure devises and adds rough pier, interblock is divided to devise high strength hinge reinforcing bar concrete apron, and antirust treatment has been carried out to hinge reinforcing bar, efficiently solve and build apron on deep sandy gravel covering layer riverbed, instantly sluicing, stream discharge per unit width is large, flow velocity is high, and the stable problem of apron self when riverbed erosion resistibility is poor, differential settlement is large, guarantee that apron globality is stablized and the long-term security of absorption basin and water retaining structure.
Accompanying drawing explanation
Fig. 1 is the structural plan figure that concrete of the present invention adds the flexible apron of rough pier.
Fig. 2 is the sectional drawing of Fig. 1.
Fig. 3 is the drawing adding rough pier in Fig. 1.
Fig. 4 is the connection drawing of concrete apron piecemeal 1 in Fig. 2.
In figure: concrete apron piecemeal 1, add rough pier 2, space plate 3, hinge reinforcing bar 4, sand-stone cushion 5, reinforced steel bar rust preventing processing layer 6.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1 to 4, a kind of concrete that the present invention proposes adds the flexible apron structure of rough pier, comprises the concrete apron piecemeal 1 on the sand-stone cushion 5 being laid on outlet structure escape works absorption basin downstream tail end.Concrete apron piecemeal 1 is the square structure of 500 × 500cm, and thickness is 80cm.Concrete apron piecemeal 1 splices mutually, stitches wide 1cm, is provided with space plate 3 in gap.Space plate 3 is pitch deals or ethylene closed cell cystosepiment.Connected through space plate 3 by hinge reinforcing bar 4 between every two concrete apron piecemeals 1.Hinge bar diameter 32mm spacing 50cm, anchors into piecemeal 100cm, arranged crosswise, the angle of the crossing 40 °.The each position of hinge reinforcing bar 4 is two, crosses through space plate 3, and the external part at its two anchors into two concrete apron piecemeals 1 respectively.
Concrete apron piecemeal 1 top is provided with and adds rough pier 2 in quincuncial arrangement.Add rough pier and be of a size of 80 × 80cm, high 30cm, the corner adding rough pier 2 is set to chamfering.Add rough pier interval to arrange, flow to spacing 170cm downstream, vertical water flows to 120cm.Add concrete apron piecemeal 1 top that rough pier 2 is arranged in apron structure anterior 1/2 or 1/3.
The construction method that concrete of the present invention adds the flexible apron structure of rough pier comprises the steps:
1) the thick sand-stone cushion of 50cm is laid excavating on the basis handled well, particle diameter 1 ~ 5cm and grating is suitable.
2) hinge reinforcing bar 4, diameter 32mm, long 200cm is prepared, at 20cm brush 2 road, middle rustproof paint, and pitching ointment, form reinforced steel bar rust preventing processing layer 6;
3) set up concrete apron piecemeal 1 template and add rough pier 2 template, and burying hinge reinforcing bar 3 underground in concrete apron piecemeal 1 surrounding, hinge rebar spacing is 50cm, 40 ° of angle arranged crosswise;
4) concreting apron piecemeal 1 and add rough pier 2, the thick 80cm of concrete apron piecemeal 1, strength grade of concrete is C25;
5) concrete curing is carried out after having built described concrete apron piecemeal and having added rough pier;
6) formwork erection cast-in-situ concrete apron piecemeal 1 is clean with the removing surface adding rough pier 2, after dry tack free, lay space plate 3 in the surrounding of concrete apron piecemeal 1, space plate 3 thickness 1cm, completes the construction of a concrete apron piecemeal 1;
7) step 3 is repeated) ~ 6), until complete all concrete apron piecemeals 1 in apron structure.
The material selected in the present invention and requirement thereof:
1) hinge reinforcing bar 4: II grades of reinforcing bars in concrete apron parting, diameter 32mm, long 200cm, 40 ° of angle arranged crosswise.
2) hinge reinforcing bar 4 middle 20cm rustproof paint and pitch ointment: rustproof paint protection apron parting place reinforcing bar to avoid corrosion, pitch ointment prevents the middle 20cm part of hinge reinforcing bar 4 and concrete bonding.
3) concrete apron piecemeal place space plate 3: space plate 3 is pitch deals or ethylene closed cell cystosepiment, thickness determines 1 ~ 2cm according to apron parting width, select that modulus of elasticity in comperssion is little, deformability is large, durability is strong, the requirement of concrete apron foundation uneven settlement can be adapted to.
According to hydraulic model test, concrete adds the flexible apron structure of rough pier when downstream water depth is more shallow, under let out design flood discharge, apron head end mean flow rate 4.7m/s, apron end mean flow rate 3.2m/s, the successful that dissipates on apron is flowed in lower sluicing, and efficiently reduce apron end flow rate of water flow, what decrease underwater bed washes away impact; In engineering actual motion, on the left of apron, stone masonry is because of differential settlement, and flood scour hole depth reaches 3.0m, but concrete adds the flexible apron of rough pier and punching cheats junction except producing larger differential settlement (35cm), and apron overall structure is intact.Illustrate that design apron adapts to foundation uneven settlement ability comparatively strong, concrete of the present invention add the flexible apron structure of rough pier and construction method technology reasonable.
Other unspecified part all belongs to prior art.
Claims (10)
1. a concrete adds the flexible apron structure of rough pier, comprise the concrete apron piecemeal (1) on the sand-stone cushion (5) being laid on outlet structure escape works absorption basin downstream tail end, described concrete apron piecemeal (1) is spliced mutually, space plate (3) is provided with in gap therebetween, it is characterized in that: described concrete apron piecemeal (1) top is provided with and adds rough pier (2) in quincuncial arrangement, connected through space plate (3) by hinge reinforcing bar (4) between every two described concrete apron piecemeals (1).
2. concrete according to claim 1 adds the flexible apron structure of rough pier, it is characterized in that: described hinge reinforcing bar (4) is two, cross through space plate (3), the external part at its two anchors into two concrete apron piecemeals (1) respectively.
3. concrete according to claim 1 adds the flexible apron structure of rough pier, it is characterized in that: the thickness of described concrete apron piecemeal (1) is 50 ~ 100cm, the described height adding rough pier (2) is 20 ~ 40cm, interval is arranged, flowing to spacing is downstream 150 ~ 200cm, and it is 100 ~ 150cm that vertical water flows to spacing.
4. concrete according to claim 2 adds the flexible apron structure of rough pier, it is characterized in that: the intersecting angle of described two hinge reinforcing bars (4) is 30 ~ 50 °, the length that two ends anchor into concrete apron piecemeal (1) is 80 ~ 120cm, spacing 40 ~ 70cm.
5. concrete according to claim 3 adds the flexible apron structure of rough pier, it is characterized in that: described in add concrete apron piecemeal (1) top that rough pier (2) is arranged in apron structure anterior 1/2 or 1/3.
6. concrete according to claim 4 adds the flexible apron structure of rough pier, it is characterized in that: described space plate (3) is pitch deals or ethylene closed cell cystosepiment.
7. concrete according to claim 5 adds the flexible apron structure of rough pier, it is characterized in that: described concrete apron piecemeal (1) is square structure, and the length of side is 400 ~ 600cm.
8. concrete according to claim 7 adds the flexible apron structure of rough pier, it is characterized in that: described in add rough pier (2) corner be set to chamfering.
9. a kind of concrete according to claim arbitrary in claim 1 ~ 8 adds the construction method of the flexible apron structure of rough pier, it is characterized in that: comprise the steps:
1) on the basis that excavation is handled well, sand-stone cushion (5) is laid;
2) prepare described hinge reinforcing bar (4), antirust treatment is carried out to the middle part of described hinge reinforcing bar (4);
3) set up described concrete apron piecemeal (1) template and add rough pier (2) template, and burying hinge reinforcing bar (4) underground in described concrete apron piecemeal (1) surrounding;
4) build described concrete apron piecemeal (1) and add rough pier (2);
5) built described concrete apron piecemeal (1) and carried out concrete curing after adding rough pier (2);
6) by cast-in-place for formwork erection described concrete apron piecemeal (1) with to add the removing surface of rough pier (2) clean, after dry tack free, lay space plate (3) in the surrounding of concrete apron piecemeal (1), complete the construction of a concrete apron piecemeal (1);
7) step 3 is repeated) ~ 6), until complete all concrete apron piecemeals (1) in apron structure.
10. concrete according to claim 9 adds the construction method of the flexible apron structure of rough pier, it is characterized in that: described step 2) in antirust treatment carries out to the middle part of described hinge reinforcing bar (4) method be middle 20cm scope brush rustproof paint to described hinge reinforcing bar (4), and pitching ointment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410737993.0A CN104452690A (en) | 2014-12-05 | 2014-12-05 | Concrete roughing pier flexible apron structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410737993.0A CN104452690A (en) | 2014-12-05 | 2014-12-05 | Concrete roughing pier flexible apron structure and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104452690A true CN104452690A (en) | 2015-03-25 |
Family
ID=52899390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410737993.0A Pending CN104452690A (en) | 2014-12-05 | 2014-12-05 | Concrete roughing pier flexible apron structure and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104452690A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863098A (en) * | 2015-05-14 | 2015-08-26 | 广东省水利水电科学研究院 | Danger-elimination refitting method for stilling pool downstream energy dissipater |
| CN104929086A (en) * | 2015-07-07 | 2015-09-23 | 苏州汇诚智造工业设计有限公司 | Water gate stilling pool base plate reinforcing structure and construction method thereof |
| CN108867583A (en) * | 2018-07-10 | 2018-11-23 | 广东省水利电力勘测设计研究院 | A kind of apron of more structure combinations |
| CN109537622A (en) * | 2018-12-19 | 2019-03-29 | 天津大学 | A kind of compound bucket foundation Anti-scouring device of offshore wind farm |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05112919A (en) * | 1991-03-15 | 1993-05-07 | Soil Kogyo Kk | Block for wave dissipation, foot protection, floor holder, and revetment, and its manufacture and form to be used for this manufacture |
| JPH0635314U (en) * | 1992-10-16 | 1994-05-10 | 昭夫 新倉 | Dissipative root block |
| JPH08151621A (en) * | 1994-11-28 | 1996-06-11 | Chiba Yogyo Kk | Revetment floor protective block |
| CN202830874U (en) * | 2012-09-21 | 2013-03-27 | 中国水电顾问集团华东勘测设计研究院 | Apron structure piled by medium rock blocks |
| CN103334525A (en) * | 2013-06-17 | 2013-10-02 | 南京长江都市建筑设计股份有限公司 | One-way prestressed laminated slab structure and construction method thereof |
| CN203741790U (en) * | 2013-10-24 | 2014-07-30 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Anti-scour apron structure for river bed covering layer |
| CN203878526U (en) * | 2014-05-30 | 2014-10-15 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Novel apron structure |
| CN204326031U (en) * | 2014-12-05 | 2015-05-13 | 长江勘测规划设计研究有限责任公司 | Concrete adds the flexible apron structure of rough pier |
-
2014
- 2014-12-05 CN CN201410737993.0A patent/CN104452690A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05112919A (en) * | 1991-03-15 | 1993-05-07 | Soil Kogyo Kk | Block for wave dissipation, foot protection, floor holder, and revetment, and its manufacture and form to be used for this manufacture |
| JPH0635314U (en) * | 1992-10-16 | 1994-05-10 | 昭夫 新倉 | Dissipative root block |
| JPH08151621A (en) * | 1994-11-28 | 1996-06-11 | Chiba Yogyo Kk | Revetment floor protective block |
| CN202830874U (en) * | 2012-09-21 | 2013-03-27 | 中国水电顾问集团华东勘测设计研究院 | Apron structure piled by medium rock blocks |
| CN103334525A (en) * | 2013-06-17 | 2013-10-02 | 南京长江都市建筑设计股份有限公司 | One-way prestressed laminated slab structure and construction method thereof |
| CN203741790U (en) * | 2013-10-24 | 2014-07-30 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Anti-scour apron structure for river bed covering layer |
| CN203878526U (en) * | 2014-05-30 | 2014-10-15 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Novel apron structure |
| CN204326031U (en) * | 2014-12-05 | 2015-05-13 | 长江勘测规划设计研究有限责任公司 | Concrete adds the flexible apron structure of rough pier |
Non-Patent Citations (3)
| Title |
|---|
| 沈文莉等: "红叶二级水电站的护坦、海漫设计", 《水电站设计》 * |
| 陈朝旭等: "三峡水库开县调节坝工程泄水闸下游消能工设计优化", 《水利水电快报》 * |
| 陈朝旭等: "三峡水库开县调节坝工程泄水闸下游消能工设计优化", 《水利水电快报》, no. 03, 31 March 2011 (2011-03-31) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104863098A (en) * | 2015-05-14 | 2015-08-26 | 广东省水利水电科学研究院 | Danger-elimination refitting method for stilling pool downstream energy dissipater |
| CN104929086A (en) * | 2015-07-07 | 2015-09-23 | 苏州汇诚智造工业设计有限公司 | Water gate stilling pool base plate reinforcing structure and construction method thereof |
| CN108867583A (en) * | 2018-07-10 | 2018-11-23 | 广东省水利电力勘测设计研究院 | A kind of apron of more structure combinations |
| CN109537622A (en) * | 2018-12-19 | 2019-03-29 | 天津大学 | A kind of compound bucket foundation Anti-scouring device of offshore wind farm |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104452690A (en) | Concrete roughing pier flexible apron structure and construction method | |
| CN204039977U (en) | A kind of antidetonation disappears unrestrained bank protection | |
| CN204326031U (en) | Concrete adds the flexible apron structure of rough pier | |
| CN109083096A (en) | A kind of step-like ecological slope protection structure of reservoir area fluctuating zone and its implementation method | |
| CN203755243U (en) | Protection structure of bridgehead conical slopes | |
| CN108978578A (en) | A kind of control method of Highway in front of the mountains and training dyke based on shunting beam flow theory | |
| CN103334419A (en) | Novel geogrid with ground anchors attached | |
| CN208981282U (en) | A kind of high earthquake territory concrete face rockfill dam dam crest structure | |
| CN201962615U (en) | Reinforcing net capable of actively preventing debris flow | |
| CN102286961B (en) | Overflow dam for waste tires | |
| CN107700434B (en) | Arch-shaped grid type reinforced concrete debris flow blocking dam and construction method thereof | |
| CN203593996U (en) | Structural body for preventing and controlling starting of trench debris flows | |
| CN206581137U (en) | A kind of drainage system device for Highway in Loess Area bridge | |
| CN205116095U (en) | Chain concrete slab piece | |
| CN104963323B (en) | A kind of chain prefabricated section mask anti-scour trench | |
| CN207933975U (en) | A kind of high stability concrete structure for slope protection system | |
| CN104727301A (en) | Geological reinforcement device | |
| CN108547262A (en) | Dam body for blocking mountain channel mountain torrents, mud-rock flow | |
| KR101170789B1 (en) | Complex debris barrier of eco-friendly | |
| CN208777255U (en) | Based on the Highway training dyke for shunting beam flow theory | |
| CN206680947U (en) | Steel water stone separates blocking dam | |
| CN114214975A (en) | Pier repairing method and pier protection structure | |
| CN209854770U (en) | Anti-impact rubber mat for concrete bottom plate of hydraulic drainage building | |
| CN203808025U (en) | Intercepting ditch structure for steeper terrain | |
| CN206956682U (en) | A kind of cushion pool structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
|
| RJ01 | Rejection of invention patent application after publication |