CN105464011A - Construction method and system for transporting, mounting and prefabricating box culverts through box culvert vehicles - Google Patents

Construction method and system for transporting, mounting and prefabricating box culverts through box culvert vehicles Download PDF

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Publication number
CN105464011A
CN105464011A CN201510795997.9A CN201510795997A CN105464011A CN 105464011 A CN105464011 A CN 105464011A CN 201510795997 A CN201510795997 A CN 201510795997A CN 105464011 A CN105464011 A CN 105464011A
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CN
China
Prior art keywords
box culvert
concrete
construction
steam
car
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
CN201510795997.9A
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Chinese (zh)
Inventor
赵允
李成章
肖加军
目灯军
张永军
方卫红
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.)
ZHONGTAI INTERNATIONAL HIGH-TECH Co Ltd
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ZHONGTAI INTERNATIONAL HIGH-TECH Co Ltd
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Application filed by ZHONGTAI INTERNATIONAL HIGH-TECH Co Ltd filed Critical ZHONGTAI INTERNATIONAL HIGH-TECH Co Ltd
Priority to CN201510795997.9A priority Critical patent/CN105464011A/en
Publication of CN105464011A publication Critical patent/CN105464011A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/08Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/093Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
    • B28B1/0935Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material using only elements wholly or partly immersed in the material, e.g. cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245Curing concrete articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02Arrangements 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00Moulds; Cores; Mandrels
    • B28B7/16Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
    • B28B7/18Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article
    • 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
    • E01F5/00Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
    • E01F5/005Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes

Abstract

The invention discloses a construction method and system for transporting, mounting and prefabricating box culverts through box culvert vehicles. The construction method comprises the following steps of determining the scope of a construction site, and establishing a processing region at one end of the construction site; prefabricating a box culvert mold, and assembling the box culvert mold at the processing region; making a bar-mat reinforcement, and placing the bar-mat reinforcement in the box culvert mold; pouring concrete; curing concrete; and performing box culvert demoulding, and transporting the box culvert to an assembling region at the other end of the construction site for box culvert mounting. Above all, according to the construction method and system for transporting, mounting and prefabricating box culverts through box culvert vehicles, provided by the invention, an advanced technology and strict technological processes are adopted, a box culvert processing site is arranged near the box culvert assembling site, varied working conditions are considered, an original concrete vibration technology and an original concrete steam curing technology are adopted, and the box culvert vehicles are used for transporting and mounting the box culverts, so that the construction cycle is short, the safety is high, and finished products have extremely high engineering quality.

Description

Construction and the system of prefabricated box culvert are installed in a kind of box culvert car transport
Technical field
The present invention relates to concrete engineering construction field, refer to that construction and the system of prefabricated box culvert are installed in the transport of a kind of box culvert car especially.
Background technology
Box culvert refers to the culvert that barrel is built with reinforced concrete box shaped tube coupling.Box culvert is made up of one or more square or rectangular cross section, is generally made up of steel concrete, and when being less than 4m across footpath, adopt box culvert, for pipe culvert, reinforced concrete box culvert is a cheap substitute.Box culvert pier, upper and lower plates is all unanimously built; Because cost is lower, many engineerings are tended to use box culvert.But current concrete box culvert carries out prefabricated at special manufacturing field usually, assemble again after the box culvert made is transported to construction plant; Directly cause engineering quantity comparatively large, a large amount of time and resource can be wasted in transportation; Moreover in transportation, very easily there is colliding with or deformation to a certain degree in box culvert, is also unfavorable for the construction precision reaching expection, affects workmanship.
Summary of the invention
In view of this, the object of the invention is to propose a kind of construction and the system that use the transport of box culvert car that prefabricated box culvert is installed.
The construction of prefabricated box culvert is installed based on above-mentioned purpose a kind of box culvert car transport provided by the invention, comprises the following steps:
Determine construction plant scope, processing district is set up in one end on construction ground;
Prefabricated box culvert mould, at processing district assembling box culvert mould;
Carry out steel mesh reinforcement peace, steel mesh reinforcement is placed in box culvert mould;
Concreting;
Concrete curing;
The box culvert demoulding, is transported to the assembling district being positioned at the construction plant other end and carries out box culvert installation by box culvert.
Further, the step of prefabricated box culvert mould comprises following sub-step:
Prefabricated bed die, described bed die is the pallet that the i iron identical with box culvert wall thickness is made;
Precast outer die, described external mold is combined integrate steel form, and its top is provided with operating platform;
Prefabricated internal mold, described internal mold is combined integrate steel form.
Further, the step of steel mesh reinforcement system peace comprises following sub-step:
Straightening → rust cleaning → line → cut-out → brake forming → joint → installation;
Wherein, after to reinforcing bar rust cleaning, carry out preparing burden and Cutting calculation, optionally carry out cold drawn or cold-drawn operation.
Further, the step of concreting also comprises following sub-step:
Select the raw material such as cement, water and aggregate;
Carry out concrete mix experiment, determine raw-material suitable match ratio;
Configuration concrete;
Concreting.
Further, the sub-step of concreting also comprises following secondary sub-step:
Build the layer of concrete of the first thickness;
Insert vibrating head;
Vibrate until the first layer of concrete is closely knit;
Take out vibrating head;
Repeat said process until all built.
Further, the first thickness is 30-40cm, and vibrating head insertion position and side form keep 25-30cm distance, and vibrating head inserts layer of concrete 5-10cm.
Further, the step of concrete curing comprises following sub-step:
After concrete box culvert cast, be placed in steam-cured cover, quietly at normal temperatures stop the first duration;
Air themperature in steam-cured cover is at the uniform velocity promoted, until air themperature reaches the first steam curing temperature in steam-cured cover with First Speed;
Keep air themperature in steam-cured cover to be the first steam curing temperature, carry out steam-cured to concrete box culvert, the duration is the second duration;
At the uniform velocity promote air themperature in steam-cured cover with second speed, until air themperature reaches the second steam curing temperature in steam-cured cover, described second speed is greater than described First Speed;
Keep air themperature in steam-cured cover to be the second steam curing temperature, carry out steam-cured to concrete box culvert, the duration is the 3rd duration, and described 3rd duration is greater than described second duration;
Air themperature in steam-cured cover is at the uniform velocity reduced, until air themperature reaches normal temperature in steam-cured cover with third speed;
The 4th duration is stopped by quiet at normal temperatures for concrete box culvert.
The present invention also provides a kind of box culvert car to transport the construction system installing prefabricated box culvert, comprising:
Construction plant, one end, described construction plant is provided with for carrying out the prefabricated processing district of box culvert, and its other end is the assembling district for carrying out box culvert installation;
Box culvert mould, described box culvert mould is arranged at described processing district, for making concrete box culvert;
Steam-cured cover, described steam-cured cover is arranged at builds outside complete box culvert mould, for box culvert mould provides steam-cured environment;
Box culvert car, for being transported to described assembling district by the concrete box culvert completed from described processing district;
Ejector apparatus, for when described concrete box culvert is assembled, carries out ejection sealing.
Further, described box culvert car comprises:
Headstock, for providing traction power;
Car body, described car body is pulled on rear side of described headstock, for carrying various kinds of equipment;
Push top bracket, is fixed in the middle part of described car body, and described push top bracket inside is provided with ejector, for ejection straight up or withdrawal;
Auxiliary stand, is detachably arranged at described car body postmedian, for being arranged at described push top bracket top to increase the height of described push top bracket temporarily;
Regulation of longitudinal angle adjusting device, to be arranged on rear side of described headstock and on front side of described car body between, for adjusting the rising height of described car body;
Lateral angles adjusting device, is arranged at described car body rear end, for adjusting the angle of inclination of described car body;
Operating desk, be arranged on rear side of described car body, being connected to described push top bracket, regulation of longitudinal angle adjusting device and lateral angles adjusting device, for controlling the lifting of described push top bracket, controlling the attitude that described regulation of longitudinal angle adjusting device and lateral angles adjusting device change described car body.
As can be seen from above, construction and the system of a kind of box culvert car transport installation prefabricated box culvert provided by the invention adopt advanced technologies and strict flow process, take into account various working, have employed concrete vibrating technique and the steam curing process of original creation, and adopt box culvert car to transport, install, short construction period, safety are high, and final products possess high workmanship.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the embodiment of the construction of prefabricated box culvert is installed in a kind of box culvert car transport provided by the invention.
Fig. 2 is the overall schematic that the embodiment of the construction system of prefabricated box culvert is installed in a kind of box culvert car transport provided by the invention;
Fig. 3 is the structural representation that box culvert car in the embodiment of the construction system of prefabricated box culvert is installed in a kind of box culvert car transport provided by the invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
It should be noted that, in the embodiment of the present invention, the statement of all uses " first " and " second " is all the parameters in order to the entity or non-equal distinguishing two same names non-equal, visible " first " " second " convenience only in order to state, should not be construed as the restriction to the embodiment of the present invention, subsequent embodiment illustrates no longer one by one to this.
Fig. 1 is the schematic flow sheet that the embodiment of the construction of prefabricated box culvert is installed in a kind of box culvert car transport provided by the invention.As shown in the figure, the construction of prefabricated box culvert is installed in a kind of box culvert car transport in the present embodiment, comprises the following steps:
S100, determine construction plant scope, processing district is set up in one end on construction ground;
S200, prefabricated box culvert mould, at processing district assembling box culvert mould;
S300, carries out steel mesh reinforcement peace, is placed in by steel mesh reinforcement in box culvert mould;
S400, concreting;
S500, concrete curing;
S600, the box culvert demoulding, is transported to the assembling district being positioned at the construction plant other end and carries out box culvert installation by box culvert.
Further, S200, the step of prefabricated box culvert mould comprises following sub-step:
S210, prefabricated bed die, described bed die is the pallet that the i iron identical with box culvert wall thickness is made;
S220, precast outer die, described external mold is combined integrate steel form, and its top is provided with operating platform;
S230, prefabricated internal mold, described internal mold is combined integrate steel form.
Further, S200, the step of prefabricated box culvert mould comprises following sub-step:
S240, after box culvert mould arrives construction plant, to mold integral polishing, cleaning, brush release agent, assembling and debugging.
Consider box culvert to be achieved design strength more than 50% time, carry out dismounting external mold and internal mold, transfer to natural curing phase district and carry out curing at moisture-retention and heat-insulation, tentatively bed die adopts the H300 i iron identical with product wall thickness as pallet, facilitate Total Product to lift and shift.
After mould is shown up, by the teams and groups of specialty to mold integral polishing, cleaning, brush release agent, assembling and debugging.When each form removal, utilize special top to draw facility, pull-out is carried out to inner and outer template and advances.Product tape pallet shifts.Mold cleaning brush release agent.Close internal mold and enter reinforcing cage, close external mold and reinforce correction.
Further, S300, the step of steel mesh reinforcement system peace comprises following sub-step:
Straightening → rust cleaning → line → cut-out → brake forming → joint → installation;
Wherein, after to reinforcing bar rust cleaning, carry out preparing burden and Cutting calculation, optionally carry out cold drawn or cold-drawn operation.
The construction technology of reinforced bar engineering comprises the processes such as batching, processing, colligation, installation, is the important component part of reinforced concrete works, and therefore necessary conscientious organizing construction, guarantees workmanship and duration.
Acceptance(check) behind field transported to by reinforcing bar, and to supplier ask for related data confirm can march into the arena, the reinforcing bar of marching into the arena is deposited in reinforcing bar storage area and stores classifiedly according to specifications and models, by materialman and administrator's check and accepting storing, list and classify and pile up, deposit according to reinforcing bar and require upper cover underlay, prevent corrosion.Raw material carry out sampling retrial after marching into the arena, and do the sampling of former material and send test room to do the qualified posteriority of correlation test can to use under having management to supervise, if when need adopt overlap joint and use location connection scheme can implement after confirming through design, management.
Steel bar meter all carries out in processing factory, strictly process by the given model of working drawing, diameter, size, quantity, during the steel bar meter of often kind of specification, all have charger sheet and blanking board, reinforcing bar flat car after processing is transported to colligation scene, but will prevent confusion.Before processing, be conscientiously familiar with drawing, length collocation rationally batching, processing dimension meets design and construction code requirement.
Reinforcing bar allowable variation after processing is in table 1:
The allowable variation of rear reinforcing bar processed by table 1
Item Project Allowable variation
1 Steel bar stress is total length dead size along the length direction ±10mm
2 The curved start position of reinforcing bar ±20mm
3 Stirrup each several part length ±5mm
4 The deviation (°) of reinforcing bar corner
Before processing, according to design specifications and length and quantity etc., in conjunction with different processing technologys, adjust the cutting length determining often kind of reinforcing bar, as reinforcing bar length need overlap not time, and adopt when overlapping with brachycephaly and be mechanically connected, use position can use after confirming through design, management, to guarantee accurately.Carry out bending (fines adopts hand spanner to bend, and thick muscle uses machinery to bend) through investigation after Steel Reinforcing Bar Material.When reinforcing bar bends, setting-out determination bending point, and according to the rebound strength determination angle of bend of often kind of reinforcing bar.Before formally bending, to the reinforcing bar bent in enormous quantities, first curved qualified and after determining relevant technical data, can bend in batches through trying.
To the reinforcing bar of finished product material not foot length, adopt and foot length is docked to welding method bends again.Butt welding personnel must through special flat welding process training, and sampling is simultaneously tested, and can on dutyly operate after qualified.After various steel bar meter is shaping, its allowable variation must not be greater than regulation and stipulation: principal rod total length dead size ± 10mm; The deviation of stirrup each several part length is ± 5mm; The deviation bending up muscle bending position of punching is component ± 20mm, prevention of mass concrete ± 30mm; The deviation of reinforcing bar corner is 3mm; 6 ~ 12mm circle muscle makes stirrup, and its terminal hook length gets 75 ~ 105mm according to muscle diameter difference of being advocated.Before blanking, concrete calculating is determined, the reinforcing bar classification after processing is listed and deposited, and is strictly on guard against into steel bar modification again in depositing and transporting simultaneously.
Reinforcing bar after processing is stored in products storage field, transports to colligation scene adopt 4 platform trailers by reinforcing bar factory.
Reinforcing bar will be examined specification, size, shape, quantity etc. in a pre-installation again, and control design drawing and charger sheet check comprehensively, and design, charger sheet, three in kind can transport and install after coincideing.Before installation, carry out unwrapping wire and pendulum muscle according to design data, simultaneously according to position situation, determine the setting of bearing rod, guarantee that the reinforcing bar after installing meets the requirements.Reinforcing bar carries out mainly through galvanized wire colligation and spot welding in installation process, tie up hole and adopt 20 ~ 22# iron wire, colligation point time and binding method will meet specification and regulatory requirements, spot welding is mainly used for the fixing of reinforcing bar in blocks and bearing rod, spot welding is wanted firmly, point is secondary uniform, simultaneously can not major injury principal rod.
The joint location of principal rod staggers mutually, in same cross section, the percentage that the sectional area of its joint of tensile region accounts for the principal rod gross area will meet the following requirements: flash butt welding is no more than 50%, and colligation joint is no more than 25%, meanwhile, colligation joint also must not more than 50% in pressure zone.Steel bar stress welding, mechanical splice will be arranged on minimum moment of flexure place and be staggeredly arranged.
In order to meet the requirement of reinforcement cover, in reinforcing bar binding process and after colligation, strictly to control topping well.The topping of the bottom projects reinforcing bars such as base plate is mainly controlled with prefabricated, that thickness is unified mortar pad, controls the spacing of levels muscle simultaneously well, can guarantee that the topping of upper and lower steel mesh reinforcement meets the requirements like this; Topping between surrounding and template, because Steel Reinforcing Bar Material error is less, through passed examination after model sheetinstallat, therefore puts at reinforcing bar and notices in process of binding that the range averaging between two ends and template can meet the demands.As found, reinforcing bar is partially long or have the not foot length being greater than topping, namely illustrate be not Steel Reinforcing Bar Material not to being exactly that formwork erection position is wrong, stop installation ascertaining the reason.To the facade such as pier, wall steel mesh reinforcement, short transverse ensures protective layer thickness effectively mainly through controlling Length of Reinforcement Before Being Incised and lap length and concrete placings elevation; To the topping between side steel mesh reinforcement and template, utilize prefabricated satisfactory, pad with the high grade mortar pad of iron wire and ensure between template and steel mesh reinforcement after binding.
Take measures in time after horizontal reinforcement net forming to be reinforced, in case during concrete placings by steel mesh reinforcement pressure from design attitude; Meanwhile, reinforce shaping after, be strictly on guard against people and store up article.After vertical reinforcement net forming, to reinforce in time equally, to prevent before formwork erection and the metaboly that is distorted in formwork erection process.
Want safekeeping after reinforcement installation is shaping, in concrete placings process, will have that special messenger is on duty simultaneously, protection, trimming.
Control concrete topping and adopt concrete pad, thickness is equal with the protective layer thickness of design, cushion block size 3cm × 3cm, and cushion block label adopts the mortar strength being greater than C25, and strengthen maintenance during making, reach design strength more than 85% can use.When using in vertical stratification, can imbed 20# wiring, with iron wire, cushion block is tied up on reinforcing bar in cushion block, base plate bottom layer and wall steel bar bed course place one piece every square metre, quincuncial arrangement.Because thickness of slab is larger, be out of shape in casting process for preventing top layer steel mesh reinforcement, adopt " A " type frame leg as the support of top layer muscle, the height of frame leg is the clear spacing of two layers of steel mesh reinforcement, frame leg every meter places one, frame leg welds with corresponding main reinforcement by arc welding by hand, founds horizontal bar as frame, to ensure the accurate of top layer reinforcement location.
Body of wall two placing of reinforcement adopts " Z " type iron brace to control, and formed by Ф 12 steel bar meter, be fixed on two row's vertical reinforcements with wiring, every 1 square meter places one.
Detect by every position of regulation butt joint of steel bar quality examination and assess standard, the quantity of joint and length; Check whether the diameter, shape, size, radical, spacing etc. of reinforcing bar be correct; Check whether the topping of reinforcing bar and the fastness of colligation meet the requirements; Check whether the surface of reinforcing bar has oil stain, paint dirt and graininess iron rust; Check whether the deviation of installing reinforcing bar meets the regulation of specification.Reinforced bar engineering installs and carries out self-inspection, and application supervisor recheck, can concreting after qualified.In concreting process, send special messenger to be responsible for reinforcing bar and safeguard, adjust in time when finding displacement distortion.The allowable variation of reinforcement installation is in table 2:
The allowable variation of table 2 reinforcement installation
Reinforced bar engineering belongs to concealed work, before concreting, will carry out an acceptance inspection, and perform record of concealed work to reinforcing bar and built-in fitting, after site supervision people agrees to, can carry out next procedure
Further, S400, the step of concreting also comprises following sub-step:
S410, selects the raw material such as cement, water and aggregate;
S420, carries out concrete mix experiment, determines raw-material suitable match ratio;
S430, configuration concrete;
S440, concreting.
Further, S440, the sub-step of concreting also comprises following secondary sub-step:
S441, builds the layer of concrete of the first thickness;
S442, inserts vibrating head;
S443, vibrates until the first layer of concrete is closely knit;
S444, takes out vibrating head;
S445, repeats said process until all built.
Further, the first thickness is 30-40cm, and vibrating head insertion position and side form keep 25-30cm distance, and vibrating head inserts layer of concrete 5-10cm.
In this step of concrete vibrating, prior art adopts the mode of vibrating outside mould usually, and its efficiency is lower, and cannot ensure that inner concrete is even; And vibrate in our rule employing mould, efficient stable, and can ensure that inner concrete is even, in concrete, bubble is fully emptying, ensures the quality of products.
When employing commercial concrete and conditions permit, agitator (Site can guarantee timely consumption) can be established in scene, and concrete transportation utilizes concrete tank to be transported to job site, utilizes concrete pump truck pumping to put in storage.For improving the number of turnover of concrete blinding, when building box culvert barrel concrete, can when concrete-agitating admixture early-strength water reducing agent.
For certain bid section, its underground water is middle rank to concrete erosion degree, needs sulfate resisting cement in employing.For Portland cement, require C 3a content is not more than 7%; Centering sulfate resisting cement C 3a content is less than 5%.Other indexs meet national Specification.For other bid sections, visual specific requirement is taken.
All suitable water drunk all can use, and undressed industrial wastewater must not use.Material contained by mixing water does not affect the growth of concrete workability and concrete strength, and causes reinforcing bar and concrete corrosion.Chemically examine water quality, the content of the pH value of water, insoluble matter, DDGS, chloride, phosphate, sulfide meets table 3 and specifies:
The table 3 content of material limit
Project Steel concrete Plain concrete
PH value >4 >4
Insoluble matter mg/L <2000 <5000
DDGS mg/L <5000 <10000
Project Steel concrete Plain concrete
Chloride (in CL-) mg/L <1200 <3500
Sulfate is (with SO 2 4Meter) mg/L <2700 <2700
Sulfide (in S2-) mg/L
Sandstone aggregate must not use alkali active aggregate to adopt non-alkali active aggregate.As used the aggregate with potential basic active, have to pass through dedicated experiments and demonstration, and in every cubic meter of concrete, total alkali must not be greater than 2.5kg.Alkali content in concrete calculates by " concrete construction specification " DL/T5144 Appendix B.Slightly, the assay of fines is submitted supervisor to, and is taked corresponding braking measure.
The aggregate of different-grain diameter is stored up respectively, forbids mutually mix and be mixed into earth; During handling, the clean free fall that particle diameter is greater than the coarse aggregate of 40mm is not more than 3m, avoids the serious fragmentation causing aggregate.The quality technology of fines requires to provide as follows:
1) fineness modulus of fines, in 2.4 ~ 3.0 scopes, method of testing is undertaken by the regulation that " concrete construction specification " (SDJ207-82 and DL/T5144-2001) is relevant;
2) the river sand that quality is hard, clean, grating is good selected by sand material;
3) quality technology of sand material requires the regulation meeting DL/T5144-2001 relevant provisions.
The quality requirement of coarse aggregate meets following provisions:
1) maximum particle diameter of coarse aggregate, is no more than 0.8 times of the minimum clear spacing of reinforcing bar and 1/4 of the minimum length of side of component section, to few muscle or without muscle structure, selects larger coarse aggregate size.
2) aggregate is selected to be graduation two in construction: be divided into 5 ~ 20mm and 20 ~ 32mm, maximum particle diameter is 32mm.
For meeting the workability needs that concrete design strength, frost resistance, impermeability, suppression sand aggregate expansion rate etc. require and construct, carry out concrete construction match ratio optimization test, meet the requirement of construction water/binder ratio and the slump simultaneously, description of materials, specification and quantity that the coordination in works that must provide by test room specifies are prepared burden, mix proportion design, test is carried out in test room, and through supervisor's examination and approval.Mix proportion will ensure that obtained concrete can meet and specifically build condition, ensures that concrete is after suitable maintenance, can reach the durability in contract required by structural concrete, impermeability and requirement of strength.In concrete mix, water supply volume is little as far as possible.
Plan was reported and submitted supervisor at first 28 days by concrete mix proportion experiment.Adjust to coordination in works by design concrete mix during construction, and report and submit supervisor to examine.The minimum amount of the concrete gel material of large volume interior of building is determined by test.
Must be strict with controlling mix proportion, for ensureing the accuracy of batching, sand material adopts electronic scale to weigh, and control errors is within 2%, and cement, water, Admixture all adopt weight metering, and control errors is within 1%.
Measure the water content of sandstone according to Changes in weather situation at any time, adjust coordination in works in time.In concrete construction, when having a kind of change in raw material, adjust match ratio by test room, but must ratify through supervisor during change match ratio.Strict control water/binder ratio, forbids to add water arbitrarily to increase the slump.
Concrete mix proportion experiment plan, comprise concrete mix proportion experiment and the concrete performance test of various different intensity grades, Mix Ratio Test shift to an earlier date 14d by the batching of various Mix Ratio Test and mix and stir, the Mix Ratio Test plan of molding and maintenance etc. reports supervisor.
Charger sheet according to Mix Ratio Test and through supervisor's approval controls concrete mix, and according to the water content situation of on-the-spot aggregate, is adjusted in total water consumption.
Concrete slump according to the character of structure position, reinforcement ratio, concrete transportation and the decision such as casting method and weather conditions, and adopts the little slump as far as possible.Concrete slump meets the requirement of SDJ207-82, GBJ97-87.In work progress, as needed to change the concrete mix through supervisor's approval, again must obtain supervisor's approval.
Commercial concrete match ratio will meet DL/T5330-2005 " mix proportion of concrete design discipline " requirement, and early strength increases the various Admixture such as fast cement and water reducing agent, air entraining agent, early strength admixture after adopting initial setting time more late, final set, concrete transportation distance should be considered, also will improve early age strength of concrete, reduce striking time, shorten construction period, especially solve the problem that increasess slowly of concrete strength of construction period in the winter time, the on-site concrete slump will control at 140-180mm.
The cast of box culvert barrel can be carried out with complete by reinforcement installation after the acceptance(check)s such as technician's quality inspection management also confirm at mould, because barrel distance ground level is more than 2m, within the whereabouts 2m of code requirement, therefore soft string bucket is set at Hatch Opening, ensures that the drop height degree that inclines of concrete is less than 2m.
Box culvert barrel concrete adopts symmetrical casting to cut to want to face limit height no more than 40cm, adopts the construction of continuous pouring method can not interval.
During concreting in order, certain orientation, certain thickness layering carry out.Concreting horizontal slice, lift height is 30 ~ 40cm, must be noted that in lower-layer concrete initial set or has built layer concrete before reinventing.
Vibrate and adopt plug-in type vibrating rod, moving interval is no more than 1.5 times of vibrating head operating radius, and keeps the distance of 25 ~ 30cm with side form.Insert lower-layer concrete 5 ~ 10cm when vibrating, after everywhere has shaken, slowly will propose vibrating head.Vibration template, reinforcing bar etc. is avoided when vibrating; Must shake to this position concrete compaction to each vibration position, namely concrete stops sinking, and no longer emits bubble, surface presentation is smooth, bleeding.Each work post will be arranged in casting process to check the change of reinforcing bar, support and template, and the situation that runs into processes in time.
Concreting keeps continuity, and the concreting allowable clearance time performs by the regulation of DL/T5144-2001 relevant provisions.If exceed the allowable clearance time, then by treatment of construction joints.Two adjacent blocks are built the intermittent time and must not be less than 72h.
When rainfall intensity is greater than 2mm/h, then any outdoor concrete must not open a position and build.If when rainfall intensity is greater than 2mm/h in casting process, stop concrete warehousing operation immediately.The concrete put in storage must by surface coverage to prevent rainwater to be mixed into and to wash away concrete, and as early as possible by concrete spreading tamping.When rainfall intensity is less than 2mm/h in concreting process, can continue to build, but face, storehouse must be taked safeguard procedures and be drained the water away in time, reduce rainwater to concrete impact.When concrete recovers to build after rainfall stops, if the not yet initial set of the concrete on surface, then restart concreting after suitable process being carried out to concrete surface according to the instruction of supervisor; Otherwise process by horizontal construction joint after concrete solidifies completely.
Further, S500, the step of concrete curing comprises following sub-step:
S510, after concrete box culvert cast, is placed in steam-cured cover, quietly at normal temperatures stops the first duration;
S520, at the uniform velocity promotes air themperature in steam-cured cover with First Speed, until air themperature reaches the first steam curing temperature in steam-cured cover;
S530, keep air themperature in steam-cured cover to be the first steam curing temperature, carry out steam-cured to concrete box culvert, the duration is the second duration;
S540, at the uniform velocity promotes air themperature in steam-cured cover with second speed, until air themperature reaches the second steam curing temperature in steam-cured cover, described second speed is greater than described First Speed;
S550, keeps air themperature in steam-cured cover to be the second steam curing temperature, carries out steam-cured to concrete box culvert, and the duration is the 3rd duration, and described 3rd duration is greater than described second duration;
S560, at the uniform velocity reduces air themperature in steam-cured cover with third speed, until air themperature reaches normal temperature in steam-cured cover;
S570, stops the 4th duration by quiet at normal temperatures for concrete box culvert.
Further, when carrying out steam-cured to concrete box culvert with the first steam curing temperature and the second steam curing temperature, relative air humidity in steam-cured cover is kept to be 90%-100%.
Further, the span of described first duration is 2 little of 6 hours, the span of described First Speed is 8 DEG C/h to 12 DEG C/h, the span of described second duration is 1 little of 2 hours, the span of described second speed is 15 DEG C/h to 25 DEG C/h, the span of described 3rd duration is 5 little of 8 hours, and the span of described third speed is-20 DEG C/h to-30 DEG C/h.
As can be seen from above-mentioned steps, steam-cured method provided by the invention, in the mode that the temperature rise period (step S2-S4) adopts two benches to heat up, namely first heat up with the First Speed of 8 DEG C/h to 12 DEG C/h, then carry out the 1 little short-term constant temperature up to 2 hours to formalize, continue afterwards to heat up with the second speed of 15 DEG C/h to 25 DEG C/h, until reach the steam curing temperature of standard, carry out the 5 little high-temperature steam curings up to 8 hours.
The mode adopting two benches to heat up, compared with heating up, possesses following advantage with one-phase of the prior art:
The first, the heating up time is short.At the intensification initial stage, if programming rate is too fast, product surface can be made to produce crack too soon because of volume expansion, heat up and then have a strong impact on production efficiency too slowly, therefore must control at 8 DEG C/h to 12 DEG C/h by degree of will speed up; And two benches heats up, then, in temperature-rise period, formalized by the short-term constant temperature of certain hour, improve the intensity of goods, make it can bear variations in temperature faster.Such as when standard steam curing temperature be 70 DEG C, normal temperature be 25 DEG C time, the one-phase according to 10 DEG C/h heats up, then need 4.5h consuming time; According to 10 DEG C/h by after temperature increase to 40 DEG C, carry out the constant temperature setting of 1h, then carry out heating direct to reaching 70 DEG C with 20 DEG C/h, only need 4h consuming time.Visible, two benches heats up effectively can reduce the heating up time, enhances productivity.
The second, component strength is high.Due in temperature-rise period, carried out the sizing of short-term constant temperature, in the process that component is heated up in second stage, deformation is less, can maintain original shape preferably; Meanwhile, short-term constant temperature sizing time, the hydration of concrete self is comparatively active, concrete hydration can be made to carry out relatively abundant, for high-temperature steam curing improve component strength provide internal conditions.
Further, step S500, box culvert is installed and is comprised following sub-step: lifting vehicle in front and the inspection of suspender and the transport of maintenance → component, visual inspection when marching into the arena → according to scene, determine the position of crane and supporting leg → unit in charge of construction determines construction and installation axis, line → loader installs wedge shape adhesive tape at member receptacles with Components installation, hook, lifting → aim at construction and installation axis with the hookup wire of component, carries out the lifting of next component after location → special equipment incremental launching positioning → passed examination in place.
Further, S600, the box culvert demoulding, is transported to the step of carrying out box culvert installation in the assembling district being positioned at the construction plant other end and comprises following sub-step by box culvert:
S610, the box culvert demoulding;
S620, uses box culvert car box culvert to be transported to assembling district;
S630, arranges rubber washer at box culvert tongue and groove;
S640, uses ejector apparatus to carry out ejection, completes box culvert and installs.
Wherein, the concrete structure of the box culvert car in step S620 is hereafter being introduced.
S630, arranges rubber washer at box culvert tongue and groove, box culvert tongue and groove first can be avoided to collide with in assembled process, cause structural failure, reduces sealing; Its two seal degree that also can increase box culvert further, improves workmanship.
The construction system of prefabricated box culvert is installed in a kind of box culvert car transport that introducing the present embodiment below provides.
Fig. 2 is the overall schematic that the embodiment of the construction system of prefabricated box culvert is installed in a kind of box culvert car transport provided by the invention; Fig. 3 is the structural representation that box culvert car in the embodiment of the construction system of prefabricated box culvert is installed in a kind of box culvert car transport provided by the invention.
As shown in Figure 2, the concrete box culvert construction system in the present embodiment comprises:
Construction plant, one end, described construction plant is provided with for carrying out the prefabricated processing district of box culvert 1, and its other end is the assembling district 2 for carrying out box culvert installation;
Box culvert mould 3, described box culvert mould 3 is arranged at described processing district 1, for making concrete box culvert;
Steam-cured cover 5, described steam-cured cover 5 is arranged at builds outside complete box culvert mould 3, for box culvert mould 3 provides steam-cured environment;
Box culvert car 4, for being transported to described assembling district 2 by the concrete box culvert completed from described processing district 1;
Ejector apparatus 6, for when described concrete box culvert is assembled, carries out ejection sealing.Optionally, described ejector apparatus 6 is removable hydraulic pressure ejection car.
Further, also comprise suspension system, described suspension system is arranged at described construction plant side, for suspending die module, box culvert etc. in midair.Preferably, described suspension system is the straddle truck be arranged on track, and described track is arranged along construction plant side.
Further, as shown in Figure 3, the box culvert car in the present embodiment comprises:
Headstock 401, for providing traction power;
Car body 402, described car body is pulled on rear side of described headstock, for carrying various kinds of equipment;
Push top bracket 404, is fixed in the middle part of described car body, and described push top bracket inside is provided with ejector, for ejection straight up or withdrawal; Thus lifting box culvert is so that transport.
Auxiliary stand 405, is detachably arranged at described car body postmedian, for being arranged at described push top bracket top to increase the height of described push top bracket temporarily;
Regulation of longitudinal angle adjusting device 406, to be arranged on rear side of described headstock and on front side of described car body between, for adjusting the rising height of described car body;
Lateral angles adjusting device 409, is arranged at described car body rear end, for adjusting the angle of inclination of described car body;
Operating desk 408, be arranged on rear side of described car body, being connected to described push top bracket, regulation of longitudinal angle adjusting device and lateral angles adjusting device, for controlling the lifting of described push top bracket, controlling the attitude that described regulation of longitudinal angle adjusting device and lateral angles adjusting device change described car body.
Above-mentioned box culvert car, when carrying box culvert, first sails in box culvert culvert, and then control push top bracket 404 lifting, box culvert is lifted away from ground, then travels to objective, fall push top bracket 404, box culvert car exits box culvert culvert, completes transportation.
Construction system in the present embodiment is when constructing, first box culvert is carried out in processing district 1 prefabricated, after the box culvert 7 completed reaches expection intensity, be transported to assembling district 2 by box culvert car 4 from processing district 1, and via ejector apparatus 6 to pushing up and splicing at first box culvert.Box culvert car 4, by the angular adjustment apparatus of its upper setting, about can regulating box culvert, upper and lower position, then completes docking.Two joint box culvert joints, place flexible rubber circle, all the other positions use cystosepiment to fill, and compared with the cast-in-place box culvert engineering method of tradition, improve 5-10 installation effectiveness doubly, 2 workmans can install more than 100 meters average every day.Whole work progress is the pipeline operations produced, assemble, and is combined in the processing place be originally separated and assembling place, saves the time of long-distance transport, improve efficiency of construction.The function that box culvert car has transport concurrently and installs, has overturned the Construction Mode of traditional prefabricated box culvert, and avoid crane construction, reduce potential safety hazard, saving the lease expenses of writing, is the brand-new engineering method of one being applied to box culvert construct.
As fully visible, construction and the system of a kind of box culvert car transport installation prefabricated box culvert provided by the invention adopt advanced technologies and strict flow process, box culvert being processed place is arranged near box culvert assembling place, take into account various working, have employed concrete vibrating technique and the steam curing process of original creation, and adopt box culvert car to transport, install, short construction period, safety are high, and final products possess high workmanship.
Those of ordinary skill in the field are to be understood that: the discussion of above any embodiment is only exemplary, and not intended to be implies that the scope of the present disclosure (comprising claim) is limited to these examples; Under thinking of the present invention, also can combine between technical characteristic in above embodiment or different embodiment, step can realize with random order, and there are other changes many of different aspect of the present invention as above, and they do not provide in details for the sake of simplicity.Therefore, within the spirit and principles in the present invention all, any omission made, amendment, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. a construction for prefabricated box culvert is installed with the transport of box culvert car, it is characterized in that, comprise the following steps:
Determine construction plant scope, processing district is set up in one end on construction ground;
Prefabricated box culvert mould, at processing district assembling box culvert mould;
Carry out steel mesh reinforcement peace, steel mesh reinforcement is placed in box culvert mould;
Concreting;
Concrete curing;
The box culvert demoulding, is transported to the assembling district being positioned at the construction plant other end and carries out box culvert installation by box culvert.
2. construction according to claim 1, is characterized in that, the step of prefabricated box culvert mould comprises following sub-step:
Prefabricated bed die, described bed die is the pallet that the i iron identical with box culvert wall thickness is made;
Precast outer die, described external mold is combined integrate steel form, and its top is provided with operating platform;
Prefabricated internal mold, described internal mold is combined integrate steel form.
3. construction according to claim 1, is characterized in that, the step of steel mesh reinforcement system peace comprises following sub-step:
Straightening → rust cleaning → line → cut-out → brake forming → joint → installation;
Wherein, after to reinforcing bar rust cleaning, carry out preparing burden and Cutting calculation, optionally carry out cold drawn or cold-drawn operation.
4. construction according to claim 1, is characterized in that, the step of concreting also comprises following sub-step:
Select the raw material such as cement, water and aggregate;
Carry out concrete mix experiment, determine raw-material suitable match ratio;
Configuration concrete;
Concreting.
5. construction according to claim 4, is characterized in that, the sub-step of concreting also comprises following secondary sub-step:
Build the layer of concrete of the first thickness;
Insert vibrating head;
Vibrate until the first layer of concrete is closely knit;
Take out vibrating head;
Repeat said process until all built.
6. construction according to claim 5, is characterized in that, the first thickness is 30-40cm, and vibrating head insertion position and side form keep 25-30cm distance, and vibrating head inserts layer of concrete 5-10cm.
7. construction according to claim 1, is characterized in that, the step of concrete curing comprises following sub-step:
After concrete box culvert cast, be placed in steam-cured cover, quietly at normal temperatures stop the first duration;
Air themperature in steam-cured cover is at the uniform velocity promoted, until air themperature reaches the first steam curing temperature in steam-cured cover with First Speed;
Keep air themperature in steam-cured cover to be the first steam curing temperature, carry out steam-cured to concrete box culvert, the duration is the second duration;
At the uniform velocity promote air themperature in steam-cured cover with second speed, until air themperature reaches the second steam curing temperature in steam-cured cover, described second speed is greater than described First Speed;
Keep air themperature in steam-cured cover to be the second steam curing temperature, carry out steam-cured to concrete box culvert, the duration is the 3rd duration, and described 3rd duration is greater than described second duration;
Air themperature in steam-cured cover is at the uniform velocity reduced, until air themperature reaches normal temperature in steam-cured cover with third speed;
The 4th duration is stopped by quiet at normal temperatures for concrete box culvert.
8. a construction system for prefabricated box culvert is installed with the transport of box culvert car, it is characterized in that, comprising:
Construction plant, one end, described construction plant is provided with for carrying out the prefabricated processing district of box culvert, and its other end is the assembling district for carrying out box culvert installation;
Box culvert mould, described box culvert mould is arranged at described processing district, for making concrete box culvert;
Steam-cured cover, described steam-cured cover is arranged at builds outside complete box culvert mould, for box culvert mould provides steam-cured environment;
Box culvert car, for being transported to described assembling district by the concrete box culvert completed from described processing district;
Ejector apparatus, for when described concrete box culvert is assembled, carries out ejection sealing.
9. construction system according to claim 8, is characterized in that, described box culvert car comprises:
Headstock, for providing traction power;
Car body, described car body is pulled on rear side of described headstock, for carrying various kinds of equipment;
Push top bracket, is fixed in the middle part of described car body, and described push top bracket inside is provided with ejector, for ejection straight up or withdrawal;
Auxiliary stand, is detachably arranged at described car body postmedian, for being arranged at described push top bracket top to increase the height of described push top bracket temporarily;
Regulation of longitudinal angle adjusting device, to be arranged on rear side of described headstock and on front side of described car body between, for adjusting the rising height of described car body;
Lateral angles adjusting device, is arranged at described car body rear end, for adjusting the angle of inclination of described car body;
Operating desk, be arranged on rear side of described car body, being connected to described push top bracket, regulation of longitudinal angle adjusting device and lateral angles adjusting device, for controlling the lifting of described push top bracket, controlling the attitude that described regulation of longitudinal angle adjusting device and lateral angles adjusting device change described car body.
CN201510795997.9A 2015-11-18 2015-11-18 Construction method and system for transporting, mounting and prefabricating box culverts through box culvert vehicles Pending CN105464011A (en)

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