Nothing Special   »   [go: up one dir, main page]

CN106758903A - The totally-enclosed sound barrier of assembly concrete - Google Patents

The totally-enclosed sound barrier of assembly concrete Download PDF

Info

Publication number
CN106758903A
CN106758903A CN201611243931.XA CN201611243931A CN106758903A CN 106758903 A CN106758903 A CN 106758903A CN 201611243931 A CN201611243931 A CN 201611243931A CN 106758903 A CN106758903 A CN 106758903A
Authority
CN
China
Prior art keywords
crossbeam
bridge
cover plate
assembly concrete
sound barrier
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
Application number
CN201611243931.XA
Other languages
Chinese (zh)
Inventor
刘振标
曾敏
罗世东
马广
康小英
陈正驰
李光凤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Siyuan Survey and Design Group Co Ltd
Original Assignee
China Railway Siyuan Survey and Design Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Railway Siyuan Survey and Design Group Co Ltd filed Critical China Railway Siyuan Survey and Design Group Co Ltd
Priority to CN201611243931.XA priority Critical patent/CN106758903A/en
Publication of CN106758903A publication Critical patent/CN106758903A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01FADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/30Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The present invention disclose a kind of assembly concrete noise barrier structure, including sound barrier base, many Pin are along suitable bridge is to the spaced crossbeam for closed circular and is laid on consistent with crossbeam direction across bridge section cover plate between adjacent beams surface;Include a piece of head piece and two panels side crossbeam per Pin crossbeams;Side crossbeam one end is fixedly connected with sound barrier base, and the other end is fixedly connected with head piece, and side crossbeam and head piece junction are shaggy tooth mouthful occlusion structure;It is oval or circle per the section of Pin crossbeam direction across bridge, and the Breadth Maximum in crossbeam direction across bridge section is more than bridge deck width.The present invention is compared to traditional gooseneck, it is not necessary to safeguard, good endurance;Steel using amount is reduced, the economy of sound barrier is improved;Defening effect is good, good endurance, and cost is less expensive, and fire protecting performance is greatly promoted;Employ the integrated curved moulding of evagination, than conventional upright formula sound barrier aeroperformance more preferably.

Description

The totally-enclosed sound barrier of assembly concrete
Technical field
A kind of railway of present invention design, highway and municipal sound barrier, specifically a kind of totally-enclosed sound-screen of assembly concrete Barrier.
Background technology
Nowadays temporarily without totally-enclosed sound barrier, and the totally-enclosed sound-screen of highway, municipal administration and field of urban rail on railway The many structure types using " steel structure framework+metallic panel absorber+transparent sound insulationg board " of barrier.
First, its steel structure framework needs regular application to safeguard, and the service life of metallic panel absorber and transparent sound insulationg board Only 15~20 years, the design service life with agent structure was not corresponded seriously for 100 years.
Second, steel construction and transparent panel involve great expense, and metallic panel absorber cost is also higher, if making in view of whole 100 years With the number of times for needing in the phase to safeguard and change, then cost is higher.
3rd, to think of plate gap excessively excessive because material defening effect itself is paid no attention to for existing this totally-enclosed sound barrier The reason for, its noise reduction is not ideal.
4th, the fire resistance of transparent sound insulationg board is poor, inflammable, the case that sound barrier catching fire often occurs, and causes great Economic loss.
The content of the invention
For the deficiency existing for existing totally-enclosed sound-screen barrier technique, there is provided a kind of long lifespan, fire resistance are good, noise reduction Good, cost and the low assembly concrete noise barrier structure of maintenance cost.
To reach above-mentioned purpose, the assembly concrete noise barrier structure of design of the invention, it is characterised in that:Including sound Barrier base, many Pin are along along bridge is to the spaced crossbeam for closed circular and is laid between adjacent beams surface horizontal with crossbeam Bridge is to the consistent cover plate in section;Crossbeam includes a piece of head piece and two panels side crossbeam described in per Pin;Described side crossbeam one end and sound Barrier base is fixedly connected, and the other end is fixedly connected with head piece, and side crossbeam is that shaggy tooth mouthful is engaged knot with head piece junction Structure;The section of crossbeam direction across bridge described in per Pin is oval or circular, and the Breadth Maximum in crossbeam direction across bridge section is more than bridge floor Width.
Preferably, the cover plate is that high-tenacity fiber strengthens the pre-formed cover plate of cement-base composite material.
It is further preferred that cover plate middle part bottom surface is provided with the ribs along bridge to arrangement.
Preferably, the crossbeam middle part surface is provided with built-in fitting, by bolt and the built-in fitting by the cover plate with it is horizontal Beam is connected.
Preferably, it is provided between the crossbeam and cover plate along bridge to the longeron for setting, the beam sides are provided with Bracket, the longeron two ends are ridden upon on the bracket and are consolidated by bolt.
Preferably, the longeron is located at the cover plate bottom, is that high-tenacity fiber enhancing cement-base composite material is prefabricated into Type longeron.
The structure it is further preferred that longeron and cover plate are formed in one.
Preferably, the crossbeam is RPC and the pre-formed crossbeam of built-in stress rib.
Preferably, the section of the crossbeam is I-beam.
Preferably, the sound barrier base is provided with rim of a cup, and described side crossbeam one end is inserted in the rim of a cup and poured in rim of a cup Building epoxy resin mortar makes side crossbeam be consolidated with sound barrier base.
Preferably, the spacing between adjacent crossbeam is 1.5~2.5 meters.
Preferably, gap is provided between adjacent cover plate, uniform filled and process glue and the weather-proof silicone of use in the gap Glue is sealed.
Used as another preferred scheme, the sound barrier is equipped with an end floor beam along along bridge to multistage, every section of two ends are divided into, With being interval with crossbeam described in many Pin between the end floor beam of section;The expansion joint of ring, institute are provided between adjacent two sections of end floor beam Expansion joint is stated to be sealed using elastic telescopic body.
The beneficial effects of the invention are as follows:It is horizontal compared to traditional steel using high-strength RPC concrete structures as crossbeam material Beam, it is not necessary to safeguard, good endurance;In addition steel using amount is reduced, the economy of sound barrier is improved.Using the ECC of high tenacity Concrete cover, not only the defening effect than conventional metals acoustic board or penetrating sound insulationg board is good, good endurance, and cost is more just Preferably, fire protecting performance is greatly promoted.Concrete cover piecemeal area is bigger than conventional sound insulationg board, so as to reduce splicing seams quantity.This Elaxtic seal is clogged in outer cover plate gap, and seam leakage voice phenomenon is substantially reduced.The integrated curved moulding of evagination is employed, than The sound barrier aeroperformance of conventional upright formula is more preferably.Cover plate materials use ECC high tenacity concrete, crossbeam to use high-strength RPC Concrete, compared to routine " gooseneck skeleton+aluminium alloy acoustic board or transparent panel " scheme, low cost, durability and fire resistance are good, And the defening effect of concrete material is more preferably, can effectively reduce the noise jamming to ecological sensitive point.Economic benefit and society's effect Benefit is prominent.Employ the integrated curved moulding of evagination, than conventional upright formula sound barrier aeroperformance more preferably.Noise control Require that more and more strictly popularizing application prospect of the invention is wide in railway and highway, municipal works.
Brief description of the drawings
Fig. 1 is section structure schematic diagram of the invention
Fig. 2 a~d is beam structure structural map of the present invention
Fig. 3 is the connecting structure schematic diagram of crossbeam of the present invention and sound barrier base
Fig. 4 is the structural representation of cover plate of the present invention
Fig. 5 is cover plate of the present invention along outer arc expanded schematic diagram
Fig. 6 a~c is crossbeam at bracket of the present invention, longeron and cover plate overlap joint schematic diagram
Fig. 7 is the overlap joint schematic diagram of crossbeam of the present invention and cover plate
Fig. 8 is the facade structures schematic diagram of certain section of the present invention
Fig. 9 is the sectional schematic diagram at expansion joint of the present invention
In figure:Sound barrier base 1 (rim of a cup 1.1, epoxy resin mortar 1.2), crossbeam 2 (head piece 2.1, side crossbeam 2.2, shaggy tooth Mouthful occlusion structure 2.3), longeron 3, cover plate 4 (ribs 4.1), box beam 5, end floor beam 6, bracket 7, built-in fitting 8, gap 9, elasticity Extrusome 10.
Specific embodiment
Below by Fig. 1~Fig. 9 and the mode of some alternative embodiments of the invention is enumerated, to technical side of the invention Case (including optimal technical scheme) is described in further detail, any technical characteristic and any technical side in the present embodiment Case is not limited the scope of the invention.
As shown in figure 1, the totally-enclosed noise barrier structure of fabricated concrete of present invention design mainly includes sound barrier base 1st, crossbeam 2, longeron 3 and cover plate 4, sound barrier base 1 are located at the two ends of the surface direction across bridge of box beam 5;Crossbeam 2 is (living using the RPC of arrangement of reinforcement Property powder concrete) material, longeron 3 and cover plate 4 are using high-tenacity fiber enhancing cement-base composite material ECC.Whole components are equal Constructed using prefabrication, field erected method.
As illustrated in figures 1 and 8, the assembly concrete noise barrier structure of design of the invention, including:It is sound barrier base 1, many Pin cuts to the spaced crossbeam 2 for closed circular and being laid between the surface of adjacent beams 2 along along bridge with the direction across bridge of crossbeam 2 The consistent cover plate 4 in face;Crossbeam 2 includes a piece of head piece 2.1 and two panels side crossbeam 2.2 described in per Pin;The sound barrier is along along bridge To multistage is divided into, every section of two ends are equipped with an end floor beam 6, with being interval with crossbeam 2 described in many Pin between the end floor beam 6 of section. The section of the direction across bridge of crossbeam 2 described in per Pin is oval or circular, and the Breadth Maximum in the direction across bridge section of crossbeam 2 is wide more than bridge floor Degree, the section of the crossbeam 2 is I-beam.Bracket 7 is provided with the sidepiece of crossbeam 2, bracket 7 is integrated pre-formed structure with crossbeam 2, And built-in stress rib.
As shown in figure 3, the sound barrier base 1 is provided with rim of a cup 1.1, described one end of side crossbeam 2.2 is inserted in the rim of a cup 1.1 And pouring epoxy resin mortar 1.2 in rim of a cup 1.1 makes side crossbeam 2.2 be consolidated with sound barrier base 1.
As depicted in figs. 1 and 2, described one end of side crossbeam 2.2 is fixedly connected with sound barrier base 1, the other end and head piece 2.1 It is fixedly connected, and side crossbeam 2.2 and the junction of head piece 2.1 are shaggy tooth mouthful occlusion structure 2.3, by the occlusion of concave-convex type Tooth mouthful enhancing joint anti-shear ability, and smear epoxy resin adhesive in seam crossing.Bracket 7, ox are provided with the sidepiece of crossbeam 2 Leg 7 is integrated pre-formed structure, and built-in stress rib with crossbeam 2.Partial prestressing muscle is shown in such as 2, it is solid in figure Line.
As shown in Figure 4 and Figure 5, it is provided between the crossbeam 2 and cover plate 4 along bridge to the longeron 3 for setting, the longeron 3 sets At the bottom two ends of the cover plate 4, longeron 3 is merged with cover plate 4, is integrated pre-formed, and section uses square-section, sectional dimension 0.19 × 0.105m can be used.Longeron 3 is connected by the bracket 7 on crossbeam 2 with crossbeam 2, and button is hung on bracket 7 during installation It is interim fixed, and be closely connected with crossbeam 2 by dormant bolt.The ring of cover plate 4 is divided into polylith (see Fig. 1), and the size of cover plate 4 can Using the arc of 2m wide 2.25~3.17m long.Cover plate 4 is rib-slab structure, thick 5cm.Cover plate is by M12 dormant bolts and horizontal stroke Beam 2 is connected.Preferably, the middle part bottom surface of the cover plate 4 is provided with the ribs 4.1 to arrangement along bridge.
As shown in Figure 6 and Figure 7, the sidepiece of the crossbeam 2 is provided with bracket 7, is all provided with the middle part surface of the crossbeam 2 and bracket 7 There is built-in fitting 8, the cover plate 4 is connected with crossbeam 2 or bracket 7 with the built-in fitting 8 by bolt.Take at the two ends of the longeron 3 It is located on the bracket 7 and is consolidated by bolt.
Gap 9 is provided between adjacent cover plate 4, uniform filled and process glue and use weather-proof silicone adhesive envelope in the gap 9 Mouthful.
Preferably, the spacing between adjacent crossbeam is 1.5~2.5 meters.
As shown in figure 9, being provided with the expansion joint of ring between adjacent two sections of end floor beam, the expansion joint uses elastic telescopic Body 10 is sealed.
It should be readily apparent to one skilled in the art that these are only presently preferred embodiments of the present invention, not limiting this hair Bright, all any modification, combination, replacement, improvement made under the spirit and principles in the present invention etc. are all contained in guarantor of the invention Within the scope of shield.

Claims (10)

1. a kind of assembly concrete noise barrier structure, it is characterised in that:Including sound barrier base (1), many Pin along suitable bridge to interval Set for closed circular crossbeam (2) and be laid on consistent with crossbeam (2) direction across bridge section between adjacent beams (2) surface Cover plate (4);Crossbeam (2) described in per Pin includes a piece of head piece (2.1) and two panels side crossbeam (2.2);The side crossbeam (2.2) one End is fixedly connected with sound barrier base (1), and the other end is fixedly connected with head piece (2.1), and side crossbeam (2.2) and head piece (2.1) junction is shaggy tooth mouthful occlusion structure (2.3);The section of crossbeam (2) direction across bridge described in per Pin is oval or circle, And the Breadth Maximum in crossbeam (2) direction across bridge section is more than bridge deck width.
2. assembly concrete noise barrier structure according to claim 1, it is characterised in that:The cover plate (4) is high-ductility The property pre-formed cover plate of fiber reinforced cement-based composite material;Cover plate (4) middle part bottom surface is provided with the reinforcement along bridge to arrangement Rib (4.1).
3. assembly concrete noise barrier structure according to claim 1, it is characterised in that:Crossbeam (2) middle part table Face is provided with built-in fitting (8), and the cover plate (4) is connected with crossbeam (2) with the built-in fitting (8) by bolt.
4. assembly concrete noise barrier structure according to claim 1, it is characterised in that:The crossbeam (2) and cover plate (4) it is provided between along bridge to the longeron (3) for setting, crossbeam (2) sidepiece is provided with bracket (7), and longeron (2) two ends are set up Consolidated on the bracket (7) and by bolt.
5. assembly concrete noise barrier structure according to claim 4, it is characterised in that:The longeron (3) is located at institute Cover plate (4) bottom is stated, is the high-tenacity fiber enhancing pre-formed longeron of cement-base composite material.
6. assembly concrete noise barrier structure according to claim 5 is entered, it is characterised in that:The longeron (3) and lid Plate (4) is formed in one structure.
7. assembly concrete noise barrier structure according to claim 1, it is characterised in that:The crossbeam (2) is activity Powder concrete and the pre-formed crossbeam of built-in stress rib;The section of the crossbeam (2) is I-beam.
8. assembly concrete noise barrier structure according to claim 1, it is characterised in that:Sound barrier (1) base sets There is rim of a cup (1.1), described side crossbeam (2) one end is inserted in the rim of a cup (1.1) and pours epoxy resin mortar in rim of a cup (1.1) (1.2) side crossbeam (2) is made to be consolidated with sound barrier base (1).
9. assembly concrete noise barrier structure according to claim 1, it is characterised in that:Between adjacent cover plate (4) Gap (9) is provided with, uniform filled and process glue and use weather-proof silicone adhesive sealing in the gap (9).
10. assembly concrete noise barrier structure according to claim 1, it is characterised in that:The sound barrier is along along bridge To multistage is divided into, every section of two ends are equipped with an end floor beam (6), horizontal described in many Pin with being interval between the end floor beam (6) of section Beam (2);The expansion joint of ring is provided between adjacent two sections of end floor beam (6), the expansion joint is close using elastic telescopic body (10) Envelope.
CN201611243931.XA 2016-12-29 2016-12-29 The totally-enclosed sound barrier of assembly concrete Pending CN106758903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611243931.XA CN106758903A (en) 2016-12-29 2016-12-29 The totally-enclosed sound barrier of assembly concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611243931.XA CN106758903A (en) 2016-12-29 2016-12-29 The totally-enclosed sound barrier of assembly concrete

Publications (1)

Publication Number Publication Date
CN106758903A true CN106758903A (en) 2017-05-31

Family

ID=58927556

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611243931.XA Pending CN106758903A (en) 2016-12-29 2016-12-29 The totally-enclosed sound barrier of assembly concrete

Country Status (1)

Country Link
CN (1) CN106758903A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109295870A (en) * 2018-09-30 2019-02-01 中铁第四勘察设计院集团有限公司 A kind of totally-enclosed noise barrier structure that steel skeleton is combined with modified ECC concrete slab
WO2022142193A1 (en) * 2020-12-30 2022-07-07 中铁六局集团北京铁路建设有限公司 Construction method for large-span thin-wall concrete sound barrier pouring trolley

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409893A1 (en) * 1994-03-23 1995-09-28 Krupp Ag Hoesch Krupp Device on track for rail vehicles
EP1719850A2 (en) * 2005-05-06 2006-11-08 Chong Nam Park Sound insulating panel structure
JP2008150861A (en) * 2006-12-18 2008-07-03 Tobishima Corp Sound absorbing panel
CN101240526A (en) * 2008-03-21 2008-08-13 东南大学 Sound barrier used for viaduct
CN101244920A (en) * 2008-03-25 2008-08-20 东南大学 Concrete base sound absorption material for road sound screen and method of manufacturing the same
CN201221058Y (en) * 2008-06-04 2009-04-15 中国建筑材料科学研究总院 V-shaped top noise reducer for acoustical barrier
KR101091855B1 (en) * 2011-03-30 2011-12-12 케이솔 주식회사 Noise removing for soundproof tunnel
CN103046490A (en) * 2012-12-28 2013-04-17 森特士兴集团股份有限公司 Totally closed sound barrier
CN203807961U (en) * 2014-03-31 2014-09-03 上海中驰建筑工程有限公司 Totally-closed sound barrier
CN104894990A (en) * 2015-06-05 2015-09-09 山西尚风科技股份有限公司 All-closed noise barrier
CN206438426U (en) * 2016-12-29 2017-08-25 中铁第四勘察设计院集团有限公司 The totally-enclosed sound barrier of assembly concrete

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409893A1 (en) * 1994-03-23 1995-09-28 Krupp Ag Hoesch Krupp Device on track for rail vehicles
EP1719850A2 (en) * 2005-05-06 2006-11-08 Chong Nam Park Sound insulating panel structure
JP2008150861A (en) * 2006-12-18 2008-07-03 Tobishima Corp Sound absorbing panel
CN101240526A (en) * 2008-03-21 2008-08-13 东南大学 Sound barrier used for viaduct
CN101244920A (en) * 2008-03-25 2008-08-20 东南大学 Concrete base sound absorption material for road sound screen and method of manufacturing the same
CN201221058Y (en) * 2008-06-04 2009-04-15 中国建筑材料科学研究总院 V-shaped top noise reducer for acoustical barrier
KR101091855B1 (en) * 2011-03-30 2011-12-12 케이솔 주식회사 Noise removing for soundproof tunnel
CN103046490A (en) * 2012-12-28 2013-04-17 森特士兴集团股份有限公司 Totally closed sound barrier
CN203807961U (en) * 2014-03-31 2014-09-03 上海中驰建筑工程有限公司 Totally-closed sound barrier
CN104894990A (en) * 2015-06-05 2015-09-09 山西尚风科技股份有限公司 All-closed noise barrier
CN206438426U (en) * 2016-12-29 2017-08-25 中铁第四勘察设计院集团有限公司 The totally-enclosed sound barrier of assembly concrete

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109295870A (en) * 2018-09-30 2019-02-01 中铁第四勘察设计院集团有限公司 A kind of totally-enclosed noise barrier structure that steel skeleton is combined with modified ECC concrete slab
WO2022142193A1 (en) * 2020-12-30 2022-07-07 中铁六局集团北京铁路建设有限公司 Construction method for large-span thin-wall concrete sound barrier pouring trolley

Similar Documents

Publication Publication Date Title
CN208702444U (en) A kind of prefabricated rail top air channel structure of postposition
CN207079627U (en) A kind of assembled underground pipe gallery member connecting structure
CN106121107A (en) Assemble type concrete slab and plate dry type method of attachment thereof
CN104251038A (en) Encased steel plate-concrete composite coupling beam and construction method thereof
CN101793070A (en) Hollow floor system filled with an air-filling bag and construction method thereof
CN109295870A (en) A kind of totally-enclosed noise barrier structure that steel skeleton is combined with modified ECC concrete slab
CN206438426U (en) The totally-enclosed sound barrier of assembly concrete
CN106758903A (en) The totally-enclosed sound barrier of assembly concrete
CN106869379A (en) A kind of assembling type steel structure Side fascia subiculum upper hanging type attachment structure
CN207331394U (en) Embedded prefabricated road plate of corner protection assembled
CN104652608B (en) Assembly type exterior wall and beam connecting structure
CN104032861B (en) Mixing coupled wall steel column and non-energy dissipating beam connecting node structure and construction method thereof
CN209722783U (en) The totally-enclosed sound barrier of railway
CN207582508U (en) A kind of permeable inspection well cover of eco-filtration
CN216640262U (en) Openable suspender anchor box with external arch ribs
CN209636881U (en) A kind of engineering structure test counter-force anchor structure
CN205975668U (en) Steel concrete hybrid structure underground box piping lane
CN108316530A (en) The assembled steel reinforced concrete composite floor and installation method connected using self-locking
CN204098355U (en) H-shaped section combined column with honeycomb steel web-steel pipe concrete flange
CN207829255U (en) The assembled steel reinforced concrete composite floor connected using self-locking
CN208455464U (en) A kind of long-life freedom from repairs big displacement bridge extension joint
CN207277172U (en) A kind of strong concrete bridge precast beam
CN206337646U (en) A kind of high-performance framework damper frame barrel structure system
CN207597436U (en) A kind of pipe trench well lid and urban road integral structure
CN205712826U (en) A kind of damping precast stair

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: 20170531

RJ01 Rejection of invention patent application after publication