CN112917669A - Synchronous prefabrication integral construction process for precast beam top anti-collision wall - Google Patents
Synchronous prefabrication integral construction process for precast beam top anti-collision wall Download PDFInfo
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- CN112917669A CN112917669A CN202110174864.5A CN202110174864A CN112917669A CN 112917669 A CN112917669 A CN 112917669A CN 202110174864 A CN202110174864 A CN 202110174864A CN 112917669 A CN112917669 A CN 112917669A
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- concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
Abstract
The invention provides a synchronous prefabrication integral construction process of an anti-collision wall on a precast beam top, which comprises the following steps of: step 1: dynamically observing the arch camber value of the box girder; step 2: preventing the side turning of the beam body; and step 3: processing the reinforcing steel bars of the anti-collision wall; and 4, step 4: prefabricating and pit-removing the boundary beam; and 5: installing a steel template; step 6: pouring concrete for the anti-collision wall; and 7: compared with the prior art, the invention has the following beneficial effects: each process of anticollision wall is prefabricated in converting into the mill, reduces the safe risk that high altitude construction brought to the at utmost, meanwhile, among the prefabricated process of anticollision wall, the support is set up conveniently, and the template mounting is simple and convenient, and concrete placement is simple and easy, improves the inside and outside quality of seeing of concrete, and certain degree improves construction quality, rationally practices thrift the time limit for a project, improves the efficiency of construction.
Description
Technical Field
The invention relates to a synchronous prefabrication integral construction process of an anti-collision wall on a prefabricated beam top, belonging to the field of highway engineering.
Background
With the popularization of the urban bridge assembly type construction process, the appearance of a large number of prefabricated parts enables bridge construction to gradually move to industrialization, standardization, modularization and scale. The anti-collision wall belongs to bridge deck engineering and is positioned at the most intuitive position of a bridge, so that the requirements on various quality indexes such as the geometric dimension, the surface finish degree, the flatness and the like are higher, and the construction quality of the anti-collision wall is particularly important for the appearance of the whole bridge. However, because the hoof-shaped part at the lower part of the anti-collision wall is in a special reverse arc shape, air bubbles on the front side surface of the hoof part are extremely difficult to discharge in the construction and pouring process, the air bubbles are often dense and large after the formwork is disassembled, meanwhile, the formwork erection is difficult due to the fact that the hanging plate is cast in place after the formwork is installed, and the surface defects such as honeycomb pitted surface and the like often occur at the joint part and the bottom of the formwork due to slurry leakage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a synchronous prefabrication integral construction process of a precast beam top anti-collision wall, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention is realized by the following technical scheme: the synchronous prefabrication integral construction process of the precast beam top anti-collision wall comprises the following steps:
step 1: dynamically observing the arch camber value of the box girder;
step 2: preventing the side turning of the beam body;
and step 3: processing the reinforcing steel bars of the anti-collision wall;
and 4, step 4: prefabricating and pit-removing the boundary beam;
and 5: installing a steel template;
step 6: pouring concrete for the anti-collision wall;
and 7: and (5) demolding and maintaining the anti-collision wall.
Further, in the step 1, the observation period of the precast box girder is as follows: and (3) observing the prestress before and after tension respectively, wherein an observation period is set every 1 day or 2 days after the prestress is applied.
Further, in the step 2, the box girder cross slope is provided with: and arranging steel plates with different thicknesses on the beam storage pedestal, and adjusting the box beam in place according to the designed cross slope.
Further, in step 3, the unloading of reinforcing bar is crooked to utilize numerical control equipment to go on, and unloading bending forming's reinforcing bar semi-manufactured goods are numbered and are stacked, and after the prefabricated pedestal of roof beam slab was hung into to the whole roof beam reinforcing bar, it is fixed to carry out the installation of boundary beam concrete steel form, then carries out crashproof wall reinforcing bar position line snapping at fixed steel form top surface, and every position of the good crashproof wall vertical reinforcement of sign to ensure that vertical reinforcement is linear unanimous with the design crashproof wall, ligature and fixed crashproof wall vertical reinforcement, vertical reinforcing bar at last.
Further, in the step 4, after the processing of the anti-collision wall reinforcing steel bars is completed, edge beam concrete pouring is performed, and after the equilateral beam concrete reaches the design strength, steel strand tensioning, prestressed pipeline grouting and edge beam maintenance are performed.
Further, in step 5, carry out the line type lofting of crashproof wall on the top surface concrete of boundary beam to pop out the inboard concrete limit ink line of crashproof wall, interior steel form adopts the portal crane in the factory, lays along beam slab top ink line in the interior steel form of every piece, adopts bolted connection between the steel form of every piece, adopts the rubber strip sealed between the interior steel form, prevents to leak thick liquid, and outer steel form stands on the center sill, relies on the square timber to prop up the adjustment elevation.
Further, in the step 6, the concrete of the anti-collision wall is transported by a concrete mixer truck, poured by an automobile pump, mixed by cement of the same brand, the same production place, the same variety and the same label to ensure the consistent color of the finished product, and high-performance concrete with good fluidity and long initial setting time is adopted to prevent the concrete from generating cold seams.
Further, in the step 7, after the concrete is poured, the formwork is removed again with the strength of the concrete when the surface and the edges of the concrete are not damaged due to formwork removal, after the anti-collision wall formwork is removed, geotextile is timely covered around the concrete, then spraying and watering maintenance are adopted, the concrete covering is to ensure that the geotextile is comprehensive, and the geotextile is always in a wet state, and covering, watering and maintenance are carried out for at least seven days.
The invention has the beneficial effects that: each process of anticollision wall is prefabricated in converting into the mill, reduces the safe risk that high altitude construction brought to the at utmost, meanwhile, the prefabricated in-process of anticollision wall, and the support is set up conveniently, and the template mounting is simple and convenient, and concrete placement is simple and easy, can improve the inside and outside quality of seeing of concrete, and certain degree improves construction quality, rationally practices thrift the time limit for a project, improves the efficiency of construction.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The invention provides a technical scheme that: the synchronous prefabrication integral construction process of the precast beam top anti-collision wall comprises the following steps:
step 1: dynamically observing the arch camber value of the box girder;
step 2: preventing the side turning of the beam body;
and step 3: processing the reinforcing steel bars of the anti-collision wall;
and 4, step 4: prefabricating and pit-removing the boundary beam;
and 5: installing a steel template;
step 6: pouring concrete for the anti-collision wall;
and 7: and (5) demolding and maintaining the anti-collision wall.
In step 1, the precast box girder observation period is as follows: the method comprises the following steps of respectively observing before and after prestress tensioning, wherein after prestress is applied, an observation period is set every 1 day or 2 days, the beam slab can arch after prestress is applied, and the value of the arch changes along with the age, so that the observation period needs to be set for the precast box girder, the development law of the pre-arch degree of the beam slab is mastered, and the observation period is carried out before and after the prestress is applied to the precast box girder, and the observation method comprises the following steps: and (3) arranging fixed observation points at 1/2L and 1/4L positions on the prefabricated box girder finished product girder, observing by adopting an automatic leveling level and recording an observation value, comparing observation data per period with first observation data, analyzing an observation result, and performing anti-collision wall construction after the box girder is stretched and tends to be stable for 2-5 days without deformation.
In step 2, the box girder cross slope is set: set up different thickness steel sheets on depositing the roof beam pedestal, put the case roof beam in place according to the design cross slope adjustment, set up four preformed holes that run through the flange board at well roof beam side cantilever end, every end is two, utilizes the pre-buried hole of depositing on the roof beam pedestal, and to drawing 10T level turn buckle screw, in the boundary beam side, utilizes to deposit roof beam pedestal support two 1.7m double-piecing 20 channel-section steels or 15cm square timber.
In step 3, blanking and bending of the reinforcing steel bars are carried out by using numerical control equipment, the semi-finished reinforcing steel bars formed by blanking and bending are numbered and stacked, after the reinforcing steel bars of the side beams are integrally hung into a beam slab prefabricated pedestal, the steel templates of the side beams are installed and fixed, then the position of the reinforcing steel bars of the anti-collision wall is bounced on the top surface of the fixed steel templates, each point position of the vertical reinforcing steel bars of the anti-collision wall is marked, the linearity of the vertical reinforcing steel bars is ensured to be consistent with the linearity of the designed anti-collision wall, the vertical reinforcing steel bars and the longitudinal reinforcing steel bars of the anti-collision wall are bound and fixed, the reinforcing steel bars of the guardrail are welded with the embedded reinforcing steel bars by adopting single-side welding, the welding length is 10 times of the diameter of the reinforcing steel bars, CO2 gas shielded welding is adopted for ensuring the thickness of the reinforcing steel bar protective layer, cracks are, the longitudinal through-length steel bars of the anti-collision guardrail at the broken joint are broken, the broken joint adopts a form of an extruded sheet and a steel plate, and the width of the broken joint is 4 cm.
In step 4, after the processing of the reinforcing steel bars of the anti-collision wall is finished, side beam concrete pouring is carried out, after equilateral beam concrete reaches the designed strength, steel strand tensioning, prestressed pipeline grouting and side beam maintenance are carried out, in order to enhance the combination degree of the anti-collision wall concrete and the side beam flange concrete, after the side beam pouring is finished, a template is disassembled, the flange side concrete is washed and roughened by a 500Kg high-pressure water gun, the surface concrete is washed away, aggregate is exposed, side beam pit leaving must be carried out after the prestressed steel strand tensioning and the prestressed pipeline grouting are finished, two large gantry cranes in a field are adopted to lift the side beam with the anti-collision wall to a side beam stacking pedestal together, the stacking pedestal is provided with four temporary supporting points, four supporting points are measured before stacking the side beam, steel plates with different thicknesses are adopted to carry out supporting point elevation adjustment so as to ensure that the transverse gradient of the side beam is consistent with the transverse gradient when the side beam is designed to be installed, and ensure that the direction is unanimous, prevent that the adverse gradient from appearing, take anticollision wall a side beam slab to set up bearing pad at well roof beam concrete top surface, prevent that the beam slab from empting, the height of support carries out the adjustment of laying-out, and the principle of adjustment is that the beam slab transverse gradient is unanimous with the transverse gradient of design installation.
In step 5, the linear lofting of the anti-collision wall is carried out on the top concrete of the boundary beam, the ink lines on the inner side concrete edges of the anti-collision wall are popped up, the inner steel formworks adopt a gantry crane in a factory, the inner edges of the inner steel formworks in each block are placed along the ink lines on the top of the beam plate, the inner steel formworks in each block are connected through bolts, the inner steel formworks are sealed through rubber strips, slurry leakage is prevented, the outer steel formworks are erected on the middle beam, and the elevation is adjusted by means of square wood pads.
The steel templates of the anti-collision wall are processed by a fixed size, in order to ensure the lightness of the steel templates, the panels are made of steel plates with the thickness of 10mm, the back parts of the panels are reinforced by vertical ribs, the distance between the vertical ribs is 1m, the templates are bolted by high-strength bolts, the straight-line-section templates are 3-5 m in section, the curve sections are 1m or 2m in section according to the curve radian, the curve is convenient to adjust, the steel templates after the manufacturing are manufactured and are trial spliced in a factory, the deviation value is less than 5mm, in order to improve the appearance smoothness of the concrete of the anti-collision wall, reduce the cleaning strength of the templates, prevent the corrosion of the steel templates, increase the turnover frequency, save the construction cost, one baking varnish is added on the panels, the qualified steel templates are conveyed to a prefabrication field and then are assembled, the assembled steel templates are subjected to size measurement, the size must be less than 5mm, and (3) until the qualified requirements are met, uniformly coating a release agent before the steel template is installed, wherein the steel template is installed totally and requires accurate positioning, reliable fixation, tight abutted seam, linear alignment and reinforced installation of the template by adopting a clamping, pulling, jacking and pressing method.
Installing an inner steel template: the inner steel templates are arranged along the top ink line of the beam slab by adopting a gantry crane in a factory, the inner edges of the inner steel templates in each block are arranged along the top ink line of the beam slab, the inner steel templates in each block are connected by adopting bolts, the inner steel templates are sealed by adopting rubber strips to prevent slurry leakage, the inner steel templates are reinforced by adopting the top and bottom supports outside the inner steel templates, the inner steel templates are reinforced by adopting a steel tube pull rod for fastening the upper opening of the inner template, the lower opening is supported by a horizontal steel tube pull rod, the upper pull rod and the lower pull rod are connected with a base by bolts, the base is connected with the beam slab concrete by adopting a screwed concrete bolt, the inner wall of the steel tube pull rod is lathed with screws with forward and reverse lathing threads at two ends, the verticality of the inner steel templates is adjusted by utilizing the entering of the steel tube and the lathing threads, the principle is like a flange screw, the gap between the lower part of the inner steel templates and, the linear basic straight is guaranteed, the top opening of the inner steel template and the top opening of the outer steel template are connected and reinforced through the counter-pulling screw, the linear primary adjustment is carried out after the inner steel template is installed, and the linear basic straight is guaranteed.
Installing an outer steel template: the outer steel form stands on the center sill, relies on the square timber bolster adjustment elevation, and outer steel form top opening adopts to be connected the reinforcement to the screw rod with interior steel form, and the outer steel form outside adopts the steel pipe pull rod to support and well roof beam concrete connection, and the steel pipe supports adopts bolted connection with the base, and the base adopts to twist concrete bolted connection with well roof beam concrete, utilizes the business turn over of steel pipe pull rod and both ends car silk screw rod to adjust outer steel form vertical height.
Setting broken joints: when the steel template is installed at a broken joint, a broken joint plate is arranged, the broken joint plate is a 1cm steel plate, a 2cm hard foam plate and a 1cm steel plate, and the size of the section is consistent with that of the anti-collision wall.
The installation requirement is as follows: when the template is erected, the inner steel template is firstly erected, after the perpendicularity of the inner steel template, the splicing of the templates and the linear adjustment of the templates are completed, the outer steel template is erected, the top height of the outer steel template is required to be on the same horizontal plane with the top of the inner steel template, an inner support is required to be added at the top of each section of template when the inner steel template and the outer steel template are reinforced, the width of the top of the template is ensured to meet the design, a sliding plate on the inner side of a water dripping groove at the bottom of the outer steel template is sealed with a sealant, slurry leakage during concrete pouring is prevented, each template is strictly hung during template installation, the perpendicularity of the templates is ensured, the templates are adjusted again after the complete section of templates are installed, the phenomena of reverse bending and sharp bending of the guardrail template are.
In step 6, the concrete of the anti-collision wall is transported by a concrete mixer truck, the concrete is poured by an automobile pump, the concrete of the same brand, the same production place, the same variety and the same label is mixed by cement to ensure the consistent color of the finished product, in order to prevent the concrete from generating cold joints, high-performance concrete with good fluidity and long initial setting time is adopted, the concrete is poured by a way of subsection layering and pushing forwards, the length of each subsection is 1-2 m, the process can greatly reduce the occurrence of the cold joints of the concrete of the anti-collision wall, the concrete is poured strictly according to layering and insertion type vibrating bars, because the anti-collision cross section is small at the upper part and large at the lower part and the corners are more, the reinforced vibration is needed at the corners, air is fully discharged, the phenomena of bubbles and cellular pitted surfaces on the surface of the concrete are reduced, meanwhile, the water marks on the surface of the concrete are generated, and a specially assigned person is responsible for checking whether the templates and the supports are, And (3) if the template joint leaks, immediately processing the template joint, vibrating concrete by professional and skilled vibrating workers, wherein the vibrating movement interval is not more than 1.5 times of the vibrating radius, the distance between the vibrating movement interval and the template edge is 5-10 cm, inserting the lower layer concrete is 5-10 cm, vibrating until no air bubbles are discharged from the concrete surface of the layer and the concrete surface stops sinking, and slowly extracting a vibrating rod while vibrating after each position is vibrated completely.
The concrete top surface is received and is wiped and receive the light and divide twice and go on, and the first time is to receive after concrete placement reaches the top and wipe for the beginning, and when concrete initial set such as the second time, receive and wipe and receive the light, require concrete top surface and steel form top surface level and smooth, the surface is smooth to ensure that top surface edges and corners concrete is regular.
In step 7, after concrete pouring is completed, the formwork is removed again with the strength of concrete when the surface and edges of the concrete are not damaged due to formwork removal, after the anti-collision wall formwork is removed, geotextile is timely covered around the concrete, then spraying and watering maintenance are adopted, the concrete covering ensures that the geotextile is comprehensive, the geotextile is always in a wet state, watering maintenance is carried out for at least seven days, during concrete maintenance, concrete false joint cutting is carried out, cracks are reduced, the false joint is set to be 1/2.5 m, the width of the false joint is 1-2 cm, and the depth is 1.5 cm.
And (3) fracture treatment: two steel plates with the thickness of 1cm are respectively pulled out from the gap, and a rigid foam plate with the thickness of 2cm is left in the concrete of the anti-collision wall.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The synchronous prefabrication integral construction process of the precast beam top anti-collision wall is characterized by comprising the following steps of:
step 1: dynamically observing the arch camber value of the box girder;
step 2: preventing the side turning of the beam body;
and step 3: processing the reinforcing steel bars of the anti-collision wall;
and 4, step 4: prefabricating and pit-removing the boundary beam;
and 5: installing a steel template;
step 6: pouring concrete for the anti-collision wall;
and 7: and (5) demolding and maintaining the anti-collision wall.
2. The synchronous prefabrication and integral construction process of the precast beam top anti-collision wall as claimed in claim 1, wherein: in the step 1, the observation period of the precast box girder is as follows: and (3) observing the prestress before and after tension respectively, wherein an observation period is set every 1 day or 2 days after the prestress is applied.
3. The synchronous prefabrication and integral construction process of the precast beam top anti-collision wall as claimed in claim 1, wherein: in the step 2, the box girder cross slope is set: and arranging steel plates with different thicknesses on the beam storage pedestal, and adjusting the box beam in place according to the designed cross slope.
4. The synchronous prefabrication and integral construction process of the precast beam top anti-collision wall as claimed in claim 1, wherein: in step 3, the unloading of reinforcing bar is crooked to utilize numerical control equipment to go on, and unloading bending forming's reinforcing bar semi-manufactured goods are numbered and are stacked, and after the prefabricated pedestal of roof beam slab was hung into to the boundary beam reinforcing bar is whole, carry out boundary beam concrete steel form installation fixed, then carry out crashproof wall reinforcing bar position spring line at fixed steel form top surface, sign well every position of crashproof wall vertical reinforcement to ensure that vertical reinforcement is linear unanimous with design crashproof wall, ligature and fixed crashproof wall vertical reinforcement, vertical reinforcement at last.
5. The synchronous prefabrication and integral construction process of the precast beam top anti-collision wall as claimed in claim 1, wherein: and 4, performing side beam concrete pouring after the processing of the anti-collision wall reinforcing steel bars is finished, and performing steel strand tensioning, prestressed pipeline grouting and side beam maintenance after the equilateral beam concrete reaches the design strength.
6. The synchronous prefabrication and integral construction process of the precast beam top anti-collision wall as claimed in claim 1, wherein: step 5, carry out the line type lofting of crashproof wall on the top surface concrete of boundary beam to pop out the inboard concrete limit ink line of crashproof wall, interior steel form adopts the portal crane in the factory, lays along beam slab top ink line with the interior border of every piece of interior steel form, adopts bolted connection between every piece of interior steel form, adopts the rubber strip sealed between the interior steel form, prevents to leak thick liquid, and outer steel form stands on the center sill, relies on the square timber to prop up the adjustment elevation.
7. The synchronous prefabrication and integral construction process of the precast beam top anti-collision wall as claimed in claim 1, wherein: in the step 6, the concrete of the anti-collision wall is transported by a concrete mixer truck, poured by an automobile pump, mixed by cement of the same brand, the same production place, the same variety and the same label to ensure the consistent color of the finished product, and high-performance concrete with good fluidity and long initial setting time is adopted to prevent the concrete from generating cold joints.
8. The synchronous prefabrication and integral construction process of the precast beam top anti-collision wall as claimed in claim 1, wherein: in the step 7, after the concrete is poured, the formwork is removed again with the strength of the concrete when the surface and the edges of the concrete are not damaged due to formwork removal, after the anti-collision wall formwork is removed, geotextile is timely covered around the concrete, then spraying and watering maintenance are adopted, the concrete covering ensures that the geotextile is comprehensive, and the geotextile is always in a wet state, and the covering and watering maintenance is carried out for at least seven days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110174864.5A CN112917669A (en) | 2021-02-09 | 2021-02-09 | Synchronous prefabrication integral construction process for precast beam top anti-collision wall |
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| CN202110174864.5A CN112917669A (en) | 2021-02-09 | 2021-02-09 | Synchronous prefabrication integral construction process for precast beam top anti-collision wall |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410226A (en) * | 1971-12-17 | 1975-10-15 | Sonneville R P | Reinforcing device for an element of prestressed concrete and applications thereof |
| CN205369035U (en) * | 2016-01-21 | 2016-07-06 | 中铁上海工程局集团有限公司 | Bearing structure that topples is prevented in precast box girder boundary beam anticollision wall construction integration |
| CN107794844A (en) * | 2017-10-31 | 2018-03-13 | 上海建工材料工程有限公司 | A kind of viaduct curve anti-collision wall is logical across precast construction method |
-
2021
- 2021-02-09 CN CN202110174864.5A patent/CN112917669A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1410226A (en) * | 1971-12-17 | 1975-10-15 | Sonneville R P | Reinforcing device for an element of prestressed concrete and applications thereof |
| CN205369035U (en) * | 2016-01-21 | 2016-07-06 | 中铁上海工程局集团有限公司 | Bearing structure that topples is prevented in precast box girder boundary beam anticollision wall construction integration |
| CN107794844A (en) * | 2017-10-31 | 2018-03-13 | 上海建工材料工程有限公司 | A kind of viaduct curve anti-collision wall is logical across precast construction method |
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Application publication date: 20210608 |