CN101736701A - Bridge steel and concrete mixing section constructing method - Google Patents
Bridge steel and concrete mixing section constructing method Download PDFInfo
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- CN101736701A CN101736701A CN 200910259822 CN200910259822A CN101736701A CN 101736701 A CN101736701 A CN 101736701A CN 200910259822 CN200910259822 CN 200910259822 CN 200910259822 A CN200910259822 A CN 200910259822A CN 101736701 A CN101736701 A CN 101736701A
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Abstract
The invention relates to a bridge steel and concrete mixing section constructing method. The method comprises the following steps of: (1) arranging a bottom mould of the steel and concrete mixing section; (2) binding bottom board reinforcing bars, and installing a prestress pipeline; (3) installing a side mould bracket and a side mould; (4) performing primary concrete pouring on the steel and concrete mixing section; (5) installing an inner ejecting mould of the steel and concrete mixing section; (6) binding top board reinforcing bars, and installing a prestress pipeline; (7) performing secondary concrete pouring on the steel and concrete mixing section. The invention has the advantages of simple and reliable method, high construction speed and guarantee of construction quality.
Description
Technical field
The present invention relates to a kind of method for bridge construction, particularly a kind of bridge steel and concrete mixing section constructing method that is applied to big width bridge steel structure and the construction of concrete structure adapter section.
Background technology
Along with the continuous development of domestic bridge, the form of structure that steel case beam combines with concrete box girder is used widely, and the steel reinforced concrete adapter section is excessive section of two kinds of structures.The construction quality of steel reinforced concrete adapter section plays an important role to the quality of bridge.Because the physical differences of concrete and steel is very big, bring very big difficulty for the construction of steel reinforced concrete adapter section.The construction of steel reinforced concrete adapter section does not at present still have the method for mature and reliable, normally limit exploration and the construction of trial limit in the concrete construction, and not only construction quality is difficult to guarantee, and incurs loss through delay the duration easily.
Summary of the invention
Purpose of the present invention promptly is to provide a kind of bridge steel and concrete mixing section constructing method of mature and reliable, guarantees construction quality, the reduction of erection time.
Job practices provided by the present invention is realized by following technical scheme:
Bridge steel and concrete mixing section constructing method is characterized in that comprising the steps:
(1) sets up steel reinforced concrete adapter section bed die: comprise that the bed die support is set up and on the bed die support, lay the base plate template, described bed die support is the support of building with pin hand steel pipe and shaped steel, described base plate template mainly is made up of bamboo offset plate, the lumps of wood, on described support, place the lumps of wood, on the described lumps of wood, lay the bamboo offset plate as panel as stiffening rib;
(2) colligation base plate reinforcing bar, vertical prestressing pipeline and base plate longitudinal prestressing pipeline are installed: after laying the base plate template, carry out vertical prestressing piping erection, the colligation of base plate bottom layer of the reinforcing steel, the piping erection of base plate longitudinal prestressing, the colligation of base plate top reinforcement in regular turn, form base plate steel lattice chamber, and will be welded to connect by longitudinal reinforcement between concrete box girder and the steel case beam along base plate;
(3) installation side die shoe frame and side form: at bed die both sides installation side die shoe frame and side form, adopt the diagonal brace carriage that side form is carried out stable support, and carry out the web reinforcement colligation, form web steel lattice chamber;
(4) carry out the concrete pouring first time: for the first time to steel reinforced concrete adapter section fluid concrete, the height of concrete pouring is that steel reinforced concrete adapter section inner bottom plating steel lattice chamber is watered and filled with and position, girder following chamfering top;
(5) backform in the steel reinforced concrete adapter section is installed: adopt scaffold building steel reinforced concrete adapter section top plate bracket, and on top plate bracket, lay backform in the lumps of wood and the bamboo offset plate formation;
(6) colligation top board reinforcing bar, top board longitudinal prestressing pipeline and transverse prestress pipeline are installed: after interior backform installs, carry out the colligation of top board bottom layer of the reinforcing steel, top board longitudinal prestressing pipeline and transverse prestress piping erection, the colligation of top board surfacing steel bar in regular turn, form top board steel lattice chamber, and will be welded to connect by longitudinal reinforcement between concrete box girder and the steel case beam along top board;
(7) carry out concrete pouring for the second time: the height of concrete pouring for the second time is the cast to bridge floor from base plate.
Further, the present invention also can comprise following feature:
Described reinforcing bar binding, the lap length between reinforcing bar is not less than 35d; Described reinforcing bar welding, lap length is not less than 10d between single fillet welded reinforcing bar, and lap length is not less than 5d between the reinforcing bar of two-sided welding; D is a bar diameter;
Described concrete pouring, it for from steel reinforced concrete adapter section and concrete box girder intersection, from the bottom to top, from the inside to the outside, and is poured into a mould by mind-set both sides in the bridge in proper order symmetrically;
In the indoor hole of vibrating of offering of described steel lattice, when the indoor fluid concrete of steel lattice, adopt vibrating spear to vibrate by the hole of vibrating, closely knit to guarantee the cast of steel lattice indoor concrete;
Described concrete adopts the C50 expansive concrete, and its slump is 18 ± 2cm;
Laminated pouring is adopted in described concrete pouring, and every layer of cast thickness should not surpass 30cm, and builds before the lower-layer concrete initial set maybe can be reinvented and finish layer concrete;
Behind the described steel reinforced concrete adapter section concrete casting complete first time, after concrete strength reaches 2.5Mpa, layering place constuction joint is adopted artificial cutter hair, cut the cement mortar and the weak layer of pine of concrete surface, and water rinses well, the maintenance that covered then and sprinkle water, and curing time is no less than 7 days;
When building for the second time concrete, concrete is cooled off to the logical cold water of steel reinforced concrete adapter section vertical prestressing pipeline.
Beneficial effect of the present invention is:
1, bridge steel and concrete mixing section constructing method provided by the invention can guarantee that quality control on construction meets the requirement of correlation technique standard.
2, bridge steel and concrete mixing section constructing method provided by the invention is simple, construction is fast, the reduction of erection time, thereby remarkable in economical benefits.
Description of drawings
Fig. 1 is a job practices flow chart of the present invention.
Fig. 2 is the vertical structure sectional view of bridge steel and concrete mixing section.
The specific embodiment
See also shown in Figure 1, bridge steel and concrete mixing section constructing method flow process provided by the present invention, it comprises the steps:
Backform in step 5, the installation steel reinforced concrete adapter section;
Step 6, colligation top board reinforcing bar are installed top board longitudinal prestressing pipeline and transverse prestress pipeline;
Step 7, carry out the concrete pouring for the second time of steel reinforced concrete adapter section.
Shown in Figure 2 is the vertical structure sectional view of bridge steel and concrete mixing section, steel reinforced concrete adapter section 1 connects steel case beam 2 and concrete box girder 3, described steel reinforced concrete adapter section 1 is the three dimension prestressing reinforced concrete structure, comprise vertical prestressing pipeline 11, longitudinal prestressing pipeline 12 and transverse prestress pipeline 13, the base plate of steel reinforced concrete adapter section, web and top board have wrapped up the end of steel case beam and concrete box girder, steel reinforced concrete adapter section base plate, the reinforcing bar 14 of web and top board has formed base plate steel lattice chamber 15, web steel lattice chamber 16 and top board steel lattice chamber 17, steel case beam 2 and concrete box girder 3 are rigidly connected by longitudinal reinforcement 18.
Below in conjunction with Fig. 2, construction method step of the present invention is elaborated.
Step 1: when the steel reinforced concrete adapter section begins to construct, to set up steel reinforced concrete adapter section bed die earlier, comprise that the bed die support sets up and lay soffit formwork on the bed die support, described bed die support is the support of building with pin hand steel pipe and shaped steel, described soffit formwork mainly is made up of bamboo offset plate, the lumps of wood, on described bed die support, place the lumps of wood, on the described lumps of wood, lay the bamboo offset plate as panel as stiffening rib.
Need to check the bed die support in the construction, the lumps of wood and carriage, distribute between the shaped steel and whether closely paste mutually, guarantee that falsework has enough intensity and stability.
Soffit formwork to check when installing the absolute altitude of soffit formwork whether provide absolute altitude to be consistent with monitoring or its deviation in the deviate that standard allows.Because the steel reinforced concrete adapter section is as the connecting portion of molded concrete box girder and steel case beam, so its absolute altitude should be according to practice of construction situation control absolute altitude, the part of guard box beam connects the overall appearance of transition and bridge.Base plate adopts lays the bamboo offset plate, notices whether the overlap joint between the plate faulting of slab ends, space occur; And base plate answers encased steel case beam, and the space must not be arranged, and should guarantee the tight of template, if there is the space to stop up or to adopt transparent rubberized fabric to paste.
Step 2: after laying soffit formwork, carry out reinforcing bar 14 colligations of 11 installations of vertical prestressing pipeline, base plate bottom, longitudinal prestressing pipeline 12 installations that are positioned at base plate, reinforcing bar 14 colligations on base plate upper strata in regular turn, form base plate steel lattice chamber 15, and will be welded to connect by longitudinal reinforcement 18 between concrete box girder 3 and the steel case beam 2 along base plate;
Step 3: after finishing base plate reinforcing bar binding and vertical prestressing piping erection,, and carry out the web reinforcement colligation, form web steel lattice chamber 16 at soffit formwork both sides installation side die shoe frame and side form.
When described side form carriage and side form are installed, adopt will put more energy into stable, firm vertical upright solid section web both sides of end floor beam of being located at concrete box girder of side form of back cord of diagonal brace carriage.In the steel reinforced concrete joint portion, the end floor beam of described concrete box girder is solid section, has several meters high, is generally 3-5 rice, exists powerful lateral pressure when concrete pouring.This solid section put more energy into back cord and diagonal brace thereof of locating side form should guarantee to stablize, firm; Construction tackles side form before and carriage checks, and after the side form installation, should guarantee that each size is not less than design load.
Step 4: after finishing above-mentioned steps, carry out the concrete pouring first time of steel reinforced concrete adapter section.The height of concrete pouring for the first time is the base plate steel lattice chamber of steel reinforced concrete adapter section to be watered fill with, and both sides then are poured into till the position, bridge main beam following chamfering top.The order of described concrete pouring is: from steel reinforced concrete adapter section and concrete box girder intersection, from the bottom to top, from the inside to the outside, symmetrically by mind-set both sides cast in the bridge; Behind the casting complete, in time it is carried out maintenance.
Laminated pouring is adopted in concrete pouring, and every layer of cast thickness should not surpass 30cm, and builds before the lower-layer concrete initial set maybe can be reinvented and finish layer concrete;
Behind the described steel reinforced concrete adapter section concrete casting complete first time, after concrete strength reaches 2.5Mpa, layering place constuction joint is adopted artificial cutter hair, cut the cement mortar and the weak layer of pine of concrete surface, and water rinses well, the maintenance that covered then and sprinkle water, and curing time is no less than 7 days.
Step 5: after above-mentioned steps 4 is finished, adopt scaffold building steel reinforced concrete adapter section top plate bracket, adjust the top plate bracket absolute altitude, on top plate bracket, lay top template in the lumps of wood and the bamboo offset plate formation steel reinforced concrete adapter section.The same with the construction of the bed die of step 1, need to check the backform support in the construction, the lumps of wood and carriage, distribute between the shaped steel whether closely subsides mutually, assurance backform support has enough intensity and stability.
Top template to check when installing the absolute altitude of top template whether provide absolute altitude to be consistent with monitoring or its deviation in the deviate that standard allows (the absolute altitude allowable variation is not more than 10mm).Because the steel reinforced concrete adapter section is as the connecting portion of molded concrete box girder and steel case beam, so its absolute altitude should be according to practice of construction situation control absolute altitude, the part of guard box beam connects the overall appearance of transition and bridge.Base plate adopts lays the bamboo offset plate, notices whether the overlap joint between the plate faulting of slab ends, space occur; And base plate answers encased steel case beam, and the space must not be arranged, and should guarantee the tight of template, if there is the space to stop up or to adopt transparent rubberized fabric to paste.
Step 6: after interior top template installs, carry out in regular turn the top board bottom reinforcing bar 14 colligations, be positioned at longitudinal prestressing pipeline 12 on the top board and the installation of transverse prestress pipeline 13, reinforcing bar 14 colligations of top board surface layer, form top board steel lattice chamber 17, and will be welded to connect by longitudinal reinforcement 18 between concrete box girder 3 and the steel case beam 2 along top board.
In the above-mentioned steps 2,3 and 6, described reinforcing bar binding, the lap length between reinforcing bar is not less than 35d; Described reinforcing bar welding, lap length is not less than 10d between single fillet welded reinforcing bar, and lap length is not less than 5d between the reinforcing bar of two-sided welding; D is a bar diameter.
In the above-mentioned steps 2,6, with longitudinal reinforcement 18 steel case beam and concrete box girder are rigidly connected, the quantity of the used reinforcing bar that is rigidly connected is relevant with the size of adapter section, mainly is according to the horizontal force of the concrete that is poured into to steel case beam.Be that example describes with certain bridge now, 4.54 meters of this bridge steel reinforced concrete joint portion total lengths are made up of the end floor beam of 1.5 meters steel case beams, 1.6 meters concrete box girders, 1.44 meters steel reinforced concrete adapter sections.
There is lateral pressure in the concrete of this bridge steel reinforced concrete adapter section to steel case beam in casting process, speed is 0.25m/h during concrete pouring, and temperature is 10 ℃, and cast highly is 0.824m, and concrete slump is 20cm.
Concrete lateral pressure is:
Effective head height h=F/r=20.6/25=0.824m
Horizontal force to steel case beam in the concrete casting process first time is: P=67t
Concrete pouring for the second time highly is 2.676m, to the horizontal force of steel case beam is: P=141t
, be rigidly connected between steel case beam and concrete box girder to the horizontal thrust of steel case beam according to concrete in twice concrete placement.Cast for the first time is rigidly connected and adopts longitudinal reinforcement Φ 12mm to be welded to connect, and its radical is no less than 55; Cast for the second time is rigidly connected and adopts longitudinal reinforcement to be no less than 60.
That prestress pipe described in the step 2,6 comprises is longitudinal and transverse, perpendicular three dimension prestressing pipeline, the installation that the installation of prestress pipe is should be in the reinforcing bar binding installation process suitable with it.Should carry out according to the flat song in the design drawing, perpendicular Qu Yaosu when prestress pipe is installed, and off normal is no more than 10mm.When prestress pipe position and plain bars clash, should suitably adjust the position of plain bars, to guarantee the accuracy of prestress pipe position.
Step 7: carry out the concrete pouring second time of steel reinforced concrete adapter section.The height of concrete pouring for the second time is the cast to bridge floor from base plate.The same with cast for the first time, the order of described concrete pouring is: from steel reinforced concrete adapter section and concrete box girder intersection, from the bottom to top, from the inside to the outside, symmetrically to the cast of bearing plate direction, and by mind-set both sides cast in the bridge.
The power transmission effect of steel reinforced concrete adapter section in full-bridge, key is the Concrete Construction quality.For guaranteeing concrete construction quality, in the process of building, can take following measure:
According to the design feature of steel reinforced concrete adapter section, in order to guarantee steel lattice indoor concrete vibration compacting, in the indoor hole of vibrating of offering of steel lattice, but should not offer the hole of too much vibrating, in the above-mentioned example, the pitch of holes of vibrating is 70cm, when the indoor fluid concrete of steel lattice, adopt 50 vibrating spears to vibrate.Except offering the hole of vibrating, in work progress, still need perforate is carried out in position, local dead angle, so that guarantee concrete compactness.
For near the concrete vibration the prestress pipe, should adopt 30 vibrating spears to operate, cause the prestress pipe breakage because of vibrating, advance to starch plugging avoiding.
Closely knit in order to guarantee concrete vibrating, according to the effect of steel reinforced concrete adapter section in full-bridge, adopt the C50 expansive concrete to pour into a mould.Carry out the proportioning test of C50 expansive concrete by test room, its coefficient of expansion is as the criterion to eliminate concrete shrinkage and creep, slump control 18 ± 2cm, and control the concrete initial setting time well according to the concrete mix ability of the standard laid down by the ministries or commissions of the Central Government.The reply aggregate washed before concrete stirred.
In the concrete placement, agitator should stir in strict accordance with the concrete mix that formulate in the laboratory, and should guarantee the continuity of concrete supply.The slump will be monitored at the scene, if find that the slump can't satisfy the construction needs and will forbid into mould.The concrete slump is unsuitable too small, and it influences concrete flowability, may cause the steel lattice indoor concrete can't vibration compacting; The slump exceeds test requirements document and then form segregation easily in the process of vibrating, and concrete quality can't be guaranteed.
For the first time and for the second time the concrete duration of pouring, under atmosphere constant temperature, carry out as far as possible, therefore be preferably between night 9～10 and begin to pour into a mould.And half an hour to 1 hour is to the cooling of sprinkling water of steel case beam before each fluid concrete.
Laminated pouring is all adopted in each concrete pouring, and every layer of cast thickness should not surpass 30cm, and should build before the lower-layer concrete initial set maybe can be reinvented and finish layer concrete, forbids to occur the cold seam of concrete.
Steel reinforced concrete adapter section concrete is casting complete for the first time, and after concrete strength reached 2.5Mpa, reply layering place constuction joint adopted artificial cutter hair.Cutting the cement mortar and the weak layer of pine of processing layer concrete surface, be standard with visible, the exposed fresh concrete of aggregate, and water is rinsed well; Before building the concrete second time, adopt the concrete surface of clear water cast for the first time moistening, preferably horizontal construction joint is spread 1: 2 the cement mortar that a bed thickness is 10～20mm.
After the concreting of steel reinforced concrete adapter section was finished, maintenance was as early as possible covered and is sprinkled water behind the Ying Zaishou slurry.Watering should be comprehensive, comprises top board, dividing plate, base plate, and concrete watering curing time is no less than 7 days, and the number of times of sprinkling water every day often is in moisture state degree of being can keep concrete surface.Before concrete strength reaches 2.5MPa, must not make it bear loads such as pedestrian, vehicle, template, support and scaffold.
Twice cast of steel reinforced concrete adapter section concrete is mass concrete construction, and it is bigger to pour into a mould thickness especially for the second time, is unfavorable for the transmission of hydration heat of concrete, therefore needs cooling tube is set in concrete, to help the transmission of hydration heat of concrete.Cooling tube can directly adopt steel reinforced concrete adapter section vertical prestressing pipeline, in the time of cast for the second time, leads to cold water to reach the concrete cooling purpose to the vertical prestressing pipeline.
Claims (7)
1. bridge steel and concrete mixing section constructing method is characterized in that comprising the steps:
(1) sets up steel reinforced concrete adapter section bed die: comprise that the bed die support is set up and on the bed die support, lay the base plate template, described bed die support is the support of building with pin hand steel pipe and shaped steel, described base plate template mainly is made up of bamboo offset plate, the lumps of wood, on described support, place the lumps of wood, on the described lumps of wood, lay the bamboo offset plate as panel as stiffening rib;
(2) colligation base plate reinforcing bar, vertical prestressing pipeline and base plate longitudinal prestressing pipeline are installed: after laying the base plate template, carry out vertical prestressing piping erection, the colligation of base plate bottom layer of the reinforcing steel, the piping erection of base plate longitudinal prestressing, the colligation of base plate top reinforcement in regular turn, form base plate steel lattice chamber, and will be welded to connect by longitudinal reinforcement between concrete box girder and the steel case beam along base plate;
(3) installation side die shoe frame and side form: at bed die both sides installation side die shoe frame and side form, adopt the diagonal brace carriage that side form is carried out stable support, and carry out the web reinforcement colligation, form web steel lattice chamber;
(4) carry out the concrete pouring first time: for the first time to steel reinforced concrete adapter section fluid concrete, the height of concrete pouring is that steel reinforced concrete adapter section inner bottom plating steel lattice chamber is watered and filled with and position, girder following chamfering top;
(5) backform in the steel reinforced concrete adapter section is installed: adopt scaffold building steel reinforced concrete adapter section top plate bracket, and on top plate bracket, lay backform in the lumps of wood and the bamboo offset plate formation;
(6) colligation top board reinforcing bar, top board longitudinal prestressing pipeline and transverse prestress pipeline are installed: after interior backform installs, carry out the colligation of top board bottom layer of the reinforcing steel, top board longitudinal prestressing pipeline and transverse prestress piping erection, the colligation of top board surfacing steel bar in regular turn, form top board steel lattice chamber, and will be welded to connect by longitudinal reinforcement between concrete box girder and the steel case beam along top board;
(7) carry out concrete pouring for the second time: the height of concrete pouring for the second time is the cast to bridge floor from base plate.
2. bridge steel and concrete mixing section constructing method according to claim 1 is characterized in that: described reinforcing bar binding, and the lap length between reinforcing bar is not less than 35d; Described reinforcing bar welding, lap length is not less than 10d between single fillet welded reinforcing bar, and lap length is not less than 5d between the reinforcing bar of two-sided welding; D is a bar diameter.
3. bridge steel and concrete mixing section constructing method according to claim 1, it is characterized in that: the order of described concrete pouring is from steel reinforced concrete adapter section and concrete box girder intersection, pour into a mould by mind-set both sides in the bridge from the bottom to top, from the inside to the outside, and symmetrically.
4. bridge steel and concrete mixing section constructing method according to claim 1, it is characterized in that: in the indoor hole of vibrating of offering of described steel lattice, when the indoor fluid concrete of steel lattice, adopt vibrating spear to vibrate by the hole of vibrating, closely knit to guarantee the cast of steel lattice indoor concrete.
5. bridge steel and concrete mixing section constructing method according to claim 1 is characterized in that: described concrete adopts the C50 expansive concrete, and its slump is 18 ± 2cm.
6. bridge steel and concrete mixing section constructing method according to claim 1 is characterized in that: laminated pouring is adopted in described concrete pouring, and every layer of cast thickness should not surpass 30cm, and builds before the lower-layer concrete initial set maybe can be reinvented and finish layer concrete.
7. bridge steel and concrete mixing section constructing method according to claim 1 is characterized in that: when building for the second time concrete, to the logical cold water of described vertical prestressing pipeline concrete is cooled off.
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| CN102400440A (en) * | 2011-11-14 | 2012-04-04 | 中铁十局集团有限公司 | Outer template |
| CN102926504A (en) * | 2012-10-09 | 2013-02-13 | 中铁十局集团有限公司 | Connecting steel construction member for steel and concrete overlapped beam combined part and construction method thereof |
| CN102926504B (en) * | 2012-10-09 | 2015-03-18 | 中铁十局集团有限公司 | Construction method of steel and concrete overlapped beam combined part |
| CN104314005B (en) * | 2014-09-19 | 2016-11-30 | 中铁四局集团第五工程有限公司 | A kind of pre-buried positioning construction method of vertical multi beam prestress wire |
| CN104314005A (en) * | 2014-09-19 | 2015-01-28 | 中铁四局集团第五工程有限公司 | Embedding positioning construction method for vertical multi-bundle pre-stressed steel strand |
| CN104631823A (en) * | 2014-12-29 | 2015-05-20 | 中铁二局股份有限公司 | Steel-concrete connecting segment construction method |
| CN106351126A (en) * | 2016-10-31 | 2017-01-25 | 华北水利水电大学 | Method for constructing steel-concrete composite segment of bridge |
| CN107447670A (en) * | 2017-08-28 | 2017-12-08 | 南昌大学 | Cable-stayed bridge mass concrete box beam weight concrete structure and construction method |
| CN108360381A (en) * | 2018-02-10 | 2018-08-03 | 北京工业大学 | No. 0 block web mass concrete heat sink of Continuous Concrete Box Girders |
| CN108797305A (en) * | 2018-07-17 | 2018-11-13 | 浙江工业大学 | A kind of list case concrete-more T-steels composite continuous beam bridge structure |
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