CN101864744A - Construction method of novel wall fence for highway - Google Patents

Construction method of novel wall fence for highway Download PDF

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Publication number
CN101864744A
CN101864744A CN 201010190167 CN201010190167A CN101864744A CN 101864744 A CN101864744 A CN 101864744A CN 201010190167 CN201010190167 CN 201010190167 CN 201010190167 A CN201010190167 A CN 201010190167A CN 101864744 A CN101864744 A CN 101864744A
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China
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prefabricated
guardrail
construction
piece
fence
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CN 201010190167
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Chinese (zh)
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CN101864744B (en
Inventor
王思海
唐重光
吕维前
刘国忠
汪润新
陈辉龙
杨宏永
邢天民
战寿德
李文克
吴伟
王艺
任鹏
张勇
袁业帅
张金辉
李帅
王闯
屈涵
刘书鹏
柴鹏
孙华
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河南省公路工程局集团有限公司
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Priority to CN2010101901670A priority Critical patent/CN101864744B/en
Publication of CN101864744A publication Critical patent/CN101864744A/en
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Publication of CN101864744B publication Critical patent/CN101864744B/en

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Abstract

The invention discloses a construction method of a novel wall fence for a highway, which comprises the following steps of: accurately lofting the inner side line and the outer side line of a fence on a bridge cored slab based on a construction design drawing by using a total station, arranging one elevation control point every 4-5 meters along the inner side line, and measuring the elevation of each elevation control point by using a leveling instrument to ensure that the height of the fence meets design requirements; installing a reinforcement cage, and arranging a troweling course; installing precast blocks and outer templates; pouring and molding concrete in two times, and carrying out serial construction by using front compaction equipment and back compaction equipment to shorten the time interval between the two pouring steps; and finally, carrying out curing and edge joint treatments. By using a construction mode combining the fence panel precasting and the on-site casting, the construction method has the advantages of beautiful molded appearance and smooth finish; and by using the vibration precasting, the construction method avoids pitting surfaces, reduces the porosity for on-site precasting, has wide application range, and achieves good economic benefits after generalization.

Description

Construction method of novel wall fence for highway

One, technical field: the present invention relates to a kind of highway barrier job practices, particularly relate to a kind of construction method of novel wall fence for highway.

Two, background technology: along with the development of economic technology, China Higher level highway is more and more, various forms of bridges are also more and more, in order to adapt to expressway safety, requirement economic, practical, attractive in appearance, on highway and bridge, all design guardrail during design, the guardrail that has is the railing type waveform configuration, is made of column and horizontal Crashworthy plate, generally is used in the roadbed range section; Another guardrail is a wall type structure, and cast-in-site forms, and generally is used in bridge construction beyond the region of objective existence side.But, corrugated guardrail only is used in the roadbed range section at present, be used in the requirement that to satisfy security performance on the works, and the cast-in-site wall fence security performance of bridge construction beyond the region of objective existence side is low, road not attractive in appearance scape is inharmonious, speed of application slow, later maintenance expense height.

Three, summary of the invention:

Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, the construction method of novel wall fence for highway that provide a kind of easy construction, implement easily, cost is lower and efficient is high.

The technical scheme that the present invention is taked for the technical solution problem is:

A kind of construction method of novel wall fence for highway is characterized in that: may further comprise the steps:

A, site operation setting-out: according to construction design drawing, go out the inside and outside sideline of guardrail with total powerstation accurate setting-out on bridge hollow board, and along absolute altitude control point of the every 4-5 rice layout of inner edge, measure the elevation at each absolute altitude control point with level gauge, guarantee that the height of guardrail meets design requirement;

The installation of b, cage of reinforcement: according to the inner edge of the guardrail of site operation setting-out and the thickness of prefabricated section, on hollowcore slab, indicate the inner edge of cage of reinforcement with the line of ink marker, at a guardrail reinforcing bar of distance guardrail outer edge design protection layer thickness place with the outside control line of a line of ink marker as cage of reinforcement, the guardrail reinforcing bar is processed into semiproduct in the unification of reinforcing bar processing space according to code requirement, is transported to connect weldering with the prestressed cored slab reserved steel bar behind the job site and make type;

C, leveling layer is set: with the M12.5 mortar the wide leveling layer of 5cm is set along the guardrail inner edge on the hollowcore slab top;

D, prefabricated section and outboard template are installed: prefabricated section is in the unified processing of prefabricated processing space, be transported to the job site with transport vehicle, guardrail inner edge according to the site operation setting-out is provided with control line with cotton rope with the absolute altitude control point on the cage of reinforcement of guardrail upper end, with the elevation and the line style of this control line control prefabricated section; After the leveling layer mortar reaches certain intensity, by outside vertical columns and the outside horizontal support bar supporting outboard template is installed, with crane prefabricated section is lifted on the leveling layer then, after prefabricated section is just flat, the reinforcing bar strut is set on cage of reinforcement props up prefabricated section, topple over displacement to prevent prefabricated section to inside, install and fix the inboard vertical columns and the inboard horizontal support bar of prefabricated section in addition, and prefabricated section and outboard template are closely connected into an integral body by the horizontal bolt that draws of the twice of inboard vertical columns and vertical columns top, the outside and bottom, draw bolt and diagonal member that prefabricated section and outboard template are carried out essence to put down by adjusting be connected with inboard vertical columns horizontal;

E, concreting: at first water is moistening with hollowcore slab top and prefabricated section, use the bucket special of making according to guardrail width suitable for reading that the guardrail concrete is discharged in the guardrail template then, the guardrail concrete is built moulding at twice, for shortening the time interval of two-step pouring, each cover equipment that vibrates of front and back is constructed continuously;

F, health: after finishing, concreting in time covers with geotextiles, and the health of after concrete final set, sprinkling water;

G, piece are handled: after treating that the guardrail concrete reaches the intensity of design and code requirement, carry out the prefabricated section piece and handle.

Behind the prefabricated section installation in position, spillage when preventing concreting, the slit filling M12.5 cement mortar between the piece between the prefabricated section and prefabricated section and hollowcore slab, treat that mortar reaches mortar 60% intensity after, begin concreting again.

After concreting is finished, arrange the special messenger to carry out guardrail top concrete and receive face, and, behind concrete initial set, carry out secondary before the final set and receive face.

When piece is handled, at first the cement mortar of clogging in the piece is rejected, with pencil and ruler the not straight suitable part of piece is marked then, subsequently according to the pencil line that indicates, with the small-size concrete cutting machine the not straight suitable part of piece is repaired, guarantee that piece is directly suitable up and down, stitch wide even, size is consistent, clog piece with macromolecule glue at last, for avoiding macromolecule glue to pollute prefabricated section, when the filling macromolecule glue, paste adhesive tape in the piece both sides, after the macromolecule glue filling is finished, adhesive tape is removed, and piece is in time once cleared up prefabricated section after handling and all finishing again.

Positive beneficial effect of the present invention is:

1, the present invention adopts prefabricated guardrail panel and the cast-in-place mode that combines to construct, it is attractive in appearance to have moulding, highly polished, adopt vibroplatform prefabricated in addition, avoid honeycomb, pitted skin, reduced the concrete pore rate of cast-in-site, improved the grade strength and the compactness of guardrail, thereby effectively improve the application life of guardrail, reduce later stage maintenance cost.

2, prefabricated section of the present invention and cage of reinforcement are all made according to designing requirement in the processing space unification, and be transported to the job site then and carry out assembly unit, the construction of batch production production line, its high efficiency, cost of manufacture is low.

3, the present invention integrates numerous advantages such as short construction period, cost be low, is applicable to the making of multiple highway and Bridge guardrail, has good economic benefit after the popularization.

Four, description of drawings:

Fig. 1 is the schematic diagram of construction method of novel wall fence for highway.

Five, the specific embodiment:

Embodiment: referring to Fig. 1, among the figure, 1-diagonal member, the inboard vertical columns of 2-, the horizontal bolt that draws of 3-, the inboard horizontal support bar of 4-, 5-prefabricated section, 6-poured in place concrete guardrail, 7-outside vertical columns, 8-outside horizontal support bar, the 9-outboard template, 10-cage of reinforcement, 11-PVC pipe, 12-hound.

One, construction process:

Construction lofting → cage of reinforcement 10 installs → be provided with leveling layer → prefabricated section 5 and outboard template 9 installation → concretings → piece is handled

Two, construction technology:

1, construction lofting: according to two staged construction design drawings; go out the inside and outside sideline of guardrail with total powerstation accurate setting-out on bridge hollow board; and (be applicable to that hollowcore slab length is the bridge of 20m along per 5 meters of inner edge; hollowcore slab length be 16m according to 4 meters controls) arrange an absolute altitude control point; measure the elevation at each absolute altitude control point with level gauge, guarantee that the height of guardrail meets design requirement.According to the actual conditions of general 2m one joint of inboard prefabricated section 5 length of guardrail, prefabricated section 5 is installed for convenience, on the guardrail inner edge, go out the position of every block of prefabricated section 5 every 2 meters setting-outs, it is accurate to guarantee that prefabricated section 5 is installed.

2, cage of reinforcement 10 is installed: according to the inner edge of the guardrail of site operation setting-out and the thickness of prefabricated section 5, indicate the inner edge of cage of reinforcement 10 with line of ink marker bridge on hollowcore slab, prevent from that cage of reinforcement 10 is wide to go out, influence the installation of prefabricated section 5.For being consistent with inboard prefabricated section 5; the guardrail outboard template 9 unified long customization steel forms of 2m that adopt; locate to indicate as outside cage of reinforcement control line apart from 55mm (guardrail reinforcing bar design protection layer thickness) at the distance outer edge with a line of ink marker; when installing, guardrail cage of reinforcement 10 cooperates the backguy scrutiny with spirit level; every inside and outside limit has and exceeds control line; must adjust guardrail cage of reinforcement 10, guarantee that thickness of protection tier meets design requirement.The guardrail reinforcing bar is processed into semiproduct in the unification of reinforcing bar processing space according to code requirement, is transported to the job site with the reinforcing bar transport vehicle, according to design and code requirement, connects weldering with the prestressed cored slab reserved steel bar and makes type.

3, template requires: adopt the typing combined steel formwork, install for ease of cooperating with inboard prefabricated section 5, it is long that outboard template 9 also is set to every joint 2m, 1.4m it is high, must carry out strictness after form joint is marched into the arena and handle, the radian slyness is smooth-going, in conjunction with tight, spillage not, guarantee the external dew of guardrail closely knit bright and clean, color and luster is consistent.

4, leveling layer is set: because the influence of construction and prestressed cored slab camber, hollowcore slab plate top planeness can't satisfy the needs of prefabricated section mounting template, and prefabricated section 5 weight are big, adjusts very difficulty.To cause the inboard prefabricated section template of guardrail to install directly not suitable because of the out-of-flatness of plate top in order to avoid, and stitches wide inhomogeneously, before assembly unit, with the M12.5 mortar the wide leveling layer of 5cm is set along the guardrail inner edge on the hollowcore slab top.The planeness of leveling layer must be controlled well, otherwise can cause prefabricated section about in the of 5 faulting of slab ends, piece stitch wide inhomogeneous.

5, prefabricated section 5 and outboard template 9 are installed: before prefabricated section 5 assembly units, the prefabricated section 5 of marching into the arena is carried out unified inspection, prefabricated section 5 unified putting together with solid colour, be convenient to install, guardrail inner edge according to setting-out is provided with control line with cotton rope with the absolute altitude control point on the cage of reinforcement 10 of guardrail upper end simultaneously, with the elevation and the line style of this control line control prefabricated section 5.

After the leveling layer mortar reaches certain intensity, at first with outboard template 9 installation in position (by outside vertical columns 7 and 8 supportings of outside horizontal support bar), with crane prefabricated section 5 is lifted on the leveling layer then, each arrangement personnel of prefabricated section 5 two ends hold up prefabricated section 5 surely during lifting, the prefabricated section 5 of avoiding colliding with influences prefabricated section 5 presentation qualities.Prefabricated section 5 preliminary leveling are in place during every prefabricated section 5 liftings according to absolute altitude and line style control line.After prefabricated section 5 is just flat, topple over displacement to the inside for preventing prefabricated section 5, the reinforcing bar strut is set on cage of reinforcement 10 props up prefabricated section 5 (not drawing among the figure), the reinforcing bar strut is connected by the lifting reserved steel bar of reserving with prefabricated the time, the distance of every reinforcing bar strut is 100cm, every block of prefabricated section 5 has two reinforcing bar struts, guarantees that effectively prefabricated section 5 is not to inner inclination.At the outside positions up and down of prefabricated section 5 each with two wide be that vertical channel-section steel of 5cm supports, linear straight with the splicing that guarantees adjacent two blocks of prefabricated sections 5, the vertical channel-section steel in top passes through inboard horizontal support bar 4 and hound 12, and to limit prefabricated sections 5 suitable for reading outward-dipping.The vertical channel-section steel in bottom is by the horizontal bolt 3 tension prefabricated sections 5 that draw of outsourcing pvc pipe 11, the spreading of prefabricated section 5 end openings runs mould when preventing to construct fluid concrete, for the sake of security, also can on the vertical channel-section steel in bottom, hound 12 be set equally, prevent the prefabricated section 5 bottoms seam that rises more effectively, improve the guardrail presentation quality.Hound 12 connects by the channel-section steel of external vertical in the road surface to be strengthened reinforcing, and has guaranteed effective " location " of prefabricated section 5 in the time of fluid concrete.For preventing that vertical channel-section steel is subjected to the presentation quality of hound 12 squeeze and destroy prefabricated sections 5; in vertical channel-section steel and hound 12 connection place pad geotextiles; simultaneously in order to guarantee the presentation quality of prefabricated section 5; prevent in the work progress that artificial spillage when trampling the marking, fluid concrete etc. pollutes prefabricated section 5; destroy the gloss and the brightness of prefabricated section 5 panels; in the work progress outside prefabricated section 5 the unified plastic sheeting of pasting protected, effectively reduce work progress and cause infringement product.

Prefabricated section 5 is effectively fixing, adopt the fixing typing of following method outboard template 9: the vertical basal surface position of at first determining outboard template 9 according to measurement result and outboard template 9 design heights, at bridge beam slab side cutter eye, insert the base support of a Φ 12I grade reinforcing steel, every one meter a support is set and guarantees outboard template 9 safety as outboard template 9.Outboard template 9 vertical positions determine that the back is in place on base support outboard template 9 with hanging device, after outboard template 9 is in place, the horizontal bolt 3 that draws by cover pvc pipe 11 effectively connects, like this outboard template 9 and prefabricated section 5 connect into as a whole, thereby guaranteed the designing requirement of the guardrail of construction.

After prefabricated section 5 is just flat, install and fix the inboard vertical columns 2 and the inboard horizontal support bar 4 of prefabricated section 5, and prefabricated section 5 and outboard template 9 are closely connected into an integral body by the horizontal bolt 3 that draws of the twice of inboard vertical columns 2 tops and bottom, draw bolt 3 and 1 pair of prefabricated section 5 of diagonal member and outboard template 9 to carry out essence to put down by adjusting be connected with inboard vertical columns 2 horizontal.

6, concreting: behind prefabricated section 5 installation in position, spillage when preventing concreting, slit between the piece between the prefabricated section 5 and prefabricated section 5 and hollowcore slab filling M12.5 cement mortar, treat that mortar reaches mortar 60% intensity after, begin concreting again.The guardrail concrete is unified in concrete agitation station and concentrates mix, is transported to the job site with concrete delivery truck.After concrete was transported to the job site, at first water was moistening with hollowcore slab top and prefabricated section 5, used the bucket special of making according to guardrail width suitable for reading that the guardrail concrete is discharged in the guardrail template then.Pollute prefabricated section 5 when preventing concreting, prefabricated section 5 is covered, and after concreting is finished, arrange the special messenger that prefabricated section 5 is cleaned with geotextiles.The guardrail concrete is built moulding at twice, and for shortening the time interval of two-step pouring, each cover equipment that vibrates of front and back is constructed continuously.

After concreting is finished, arrange the special messenger to carry out guardrail top concrete and receive face, concrete smooth for guaranteeing that guardrail pushes up, avoid 5 of cast-in-situ concrete and prefabricated sections the crack to occur, behind concrete initial set, carry out secondary before the final set and receive face.

7, health: after finishing, concreting in time covers with geotextiles, and the health of after concrete final set, sprinkling water.Cast is over second day with regard to form removal, and health must cover with clean geotextiles for avoiding polluting prefabricated section 5 then, with clean drinking water health.

8, piece is handled: after treating that the guardrail concrete reaches the intensity of design and code requirement, carry out prefabricated section 5 pieces and handle.At first the cement mortar of clogging in the piece is rejected, with pencil and ruler the not straight suitable part of piece is marked then, subsequently according to the pencil line that indicates, with the small-size concrete cutting machine the not straight suitable part of piece is repaired, guarantee that piece is directly suitable up and down, seam is wide evenly, size is consistent, clog piece with macromolecule glue at last, for avoiding macromolecule glue to pollute prefabricated section 5, influence the outward appearance of prefabricated section 5, when the filling macromolecule glue, paste adhesive tape in the piece both sides, after the macromolecule glue filling is finished, adhesive tape is removed.Piece is in time once cleared up prefabricated section 5 after handling and all finishing again.

Change the concrete parameter value in the foregoing description, can form a plurality of examples of implementation, be common excursion of the present invention, do not describe in detail one by one at this.

Claims (4)

1. construction method of novel wall fence for highway is characterized in that: may further comprise the steps:
A, site operation setting-out: according to construction design drawing, go out the inside and outside sideline of guardrail with total powerstation accurate setting-out on bridge hollow board, and along absolute altitude control point of the every 4-5 rice layout of inner edge, measure the elevation at each absolute altitude control point with level gauge, guarantee that the height of guardrail meets design requirement;
The installation of b, cage of reinforcement: according to the inner edge of the guardrail of site operation setting-out and the thickness of prefabricated section, on hollowcore slab, indicate the inner edge of cage of reinforcement with the line of ink marker, at a guardrail reinforcing bar of distance guardrail outer edge design protection layer thickness place with the outside control line of a line of ink marker as cage of reinforcement, the guardrail reinforcing bar is processed into semiproduct in the unification of reinforcing bar processing space according to code requirement, is transported to connect weldering with the prestressed cored slab reserved steel bar behind the job site and make type;
C, leveling layer is set: with the M12.5 mortar the wide leveling layer of 5cm is set along the guardrail inner edge on the hollowcore slab top;
D, prefabricated section and outboard template are installed: prefabricated section is in the unified processing of prefabricated processing space, be transported to the job site with transport vehicle, guardrail inner edge according to the site operation setting-out is provided with control line with cotton rope with the absolute altitude control point on the cage of reinforcement of guardrail upper end, with the elevation and the line style of this control line control prefabricated section; After the leveling layer mortar reaches certain intensity, by outside vertical columns and the outside horizontal support bar supporting outboard template is installed, with crane prefabricated section is lifted on the leveling layer then, after prefabricated section is just flat, the reinforcing bar strut is set on cage of reinforcement props up prefabricated section, topple over displacement to prevent prefabricated section to inside, install and fix the inboard vertical columns and the inboard horizontal support bar of prefabricated section in addition, and prefabricated section and outboard template are closely connected into an integral body by the horizontal bolt that draws of the twice of inboard vertical columns and vertical columns top, the outside and bottom, draw bolt and diagonal member that prefabricated section and outboard template are carried out essence to put down by adjusting be connected with inboard vertical columns horizontal;
E, concreting: at first water is moistening with hollowcore slab top and prefabricated section, use the bucket special of making according to guardrail width suitable for reading that the guardrail concrete is discharged in the guardrail template then, the guardrail concrete is built moulding at twice, for shortening the time interval of two-step pouring, each cover equipment that vibrates of front and back is constructed continuously;
F, health: after finishing, concreting in time covers with geotextiles, and the health of after concrete final set, sprinkling water;
G, piece are handled: after treating that the guardrail concrete reaches the intensity of design and code requirement, carry out the prefabricated section piece and handle.
2. construction method of novel wall fence for highway according to claim 1, it is characterized in that: behind the prefabricated section installation in position, spillage when preventing concreting, slit filling M12.5 cement mortar between the piece between the prefabricated section and prefabricated section and hollowcore slab, after treating that mortar reaches mortar 60% intensity, begin concreting again.
3. construction method of novel wall fence for highway according to claim 2 is characterized in that: after concreting is finished, arranges the special messenger to carry out guardrail top concrete and receives face, and, behind concrete initial set, carry out secondary before the final set and receive face.
4. construction method of novel wall fence for highway according to claim 3, it is characterized in that: when piece is handled, at first the cement mortar of clogging in the piece is rejected, with pencil and ruler the not straight suitable part of piece is marked then, subsequently according to the pencil line that indicates, with the small-size concrete cutting machine the not straight suitable part of piece is repaired, guarantee that piece is directly suitable up and down, stitch wide even, size is consistent, clog piece with macromolecule glue at last, for avoiding macromolecule glue to pollute prefabricated section, when the filling macromolecule glue, paste adhesive tape in the piece both sides, after the macromolecule glue filling is finished, adhesive tape is removed, piece is in time once cleared up prefabricated section after handling and all finishing again.
CN2010101901670A 2010-06-03 2010-06-03 Construction method of novel wall fence for highway CN101864744B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103061267A (en) * 2013-01-15 2013-04-24 广州市市政工程设计研究院 Construction method of combined prefabricated bridge anti-collision wall
CN103821089A (en) * 2014-02-25 2014-05-28 中天建设集团有限公司 Outwards-wrapped-type anti-collision guardrail construction method
CN106351147A (en) * 2015-07-15 2017-01-25 岳阳安泰起重设备有限公司 Whole walking parapet template dismantling machine
CN106567329A (en) * 2016-11-07 2017-04-19 上海市政工程设计研究总院(集团)有限公司 Semi-prefabricated reinforced concrete wall type guardrail
CN106567328A (en) * 2016-11-07 2017-04-19 上海市政工程设计研究总院(集团)有限公司 Half-prefabricated reinforced concrete wall-type guardrail construction process
CN106968177A (en) * 2017-03-29 2017-07-21 广州众顶建筑工程科技有限公司 A kind of bridge equipment
CN107476198A (en) * 2017-08-18 2017-12-15 中交二航局第二工程有限公司 Prefabricated guardrail swings to construction method
CN109853430A (en) * 2018-12-19 2019-06-07 苏州交通工程集团有限公司 Highway concrete guardrail automatic spray curing system and its control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07317029A (en) * 1994-05-20 1995-12-05 Keihan Concrete Kogyo Kk Structure of wall in wall structure and construction method thereof
DE19855441A1 (en) * 1997-12-23 1999-06-24 Josef Stoeckl Crash barrier construction for roads
JP2002038419A (en) * 2000-07-21 2002-02-06 Sanken Steel:Kk Steel-made wall handrail and installing method of steel- made wall handrail

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07317029A (en) * 1994-05-20 1995-12-05 Keihan Concrete Kogyo Kk Structure of wall in wall structure and construction method thereof
DE19855441A1 (en) * 1997-12-23 1999-06-24 Josef Stoeckl Crash barrier construction for roads
JP2002038419A (en) * 2000-07-21 2002-02-06 Sanken Steel:Kk Steel-made wall handrail and installing method of steel- made wall handrail

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103061267A (en) * 2013-01-15 2013-04-24 广州市市政工程设计研究院 Construction method of combined prefabricated bridge anti-collision wall
CN103821089A (en) * 2014-02-25 2014-05-28 中天建设集团有限公司 Outwards-wrapped-type anti-collision guardrail construction method
CN106351147A (en) * 2015-07-15 2017-01-25 岳阳安泰起重设备有限公司 Whole walking parapet template dismantling machine
CN106567329A (en) * 2016-11-07 2017-04-19 上海市政工程设计研究总院(集团)有限公司 Semi-prefabricated reinforced concrete wall type guardrail
CN106567328A (en) * 2016-11-07 2017-04-19 上海市政工程设计研究总院(集团)有限公司 Half-prefabricated reinforced concrete wall-type guardrail construction process
CN106968177A (en) * 2017-03-29 2017-07-21 广州众顶建筑工程科技有限公司 A kind of bridge equipment
CN106968177B (en) * 2017-03-29 2018-11-27 泰兴市东城水处理工程有限公司 A kind of bridge equipment
CN107476198A (en) * 2017-08-18 2017-12-15 中交二航局第二工程有限公司 Prefabricated guardrail swings to construction method
CN109853430A (en) * 2018-12-19 2019-06-07 苏州交通工程集团有限公司 Highway concrete guardrail automatic spray curing system and its control method

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