CN101413251A - 0 type block anti-cracking construction method of high pier large across creeping formwork - Google Patents
0 type block anti-cracking construction method of high pier large across creeping formwork Download PDFInfo
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- CN101413251A CN101413251A CNA2008101978092A CN200810197809A CN101413251A CN 101413251 A CN101413251 A CN 101413251A CN A2008101978092 A CNA2008101978092 A CN A2008101978092A CN 200810197809 A CN200810197809 A CN 200810197809A CN 101413251 A CN101413251 A CN 101413251A
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Abstract
The invention discloses a No. 0 block anti-cracking construction method for high-pier long-span continuous rigid frame bridges. Concrete is poured twice on a pier top platform, wherein the concrete is poured to a height between 0.3 and 0.6 time that of a web plate in a first step; the rest concrete is poured in a second step; and the age of two layers of concrete is controlled within 15 days. The construction method comprises the following steps of: a. preparing for construction; b. installing a cooling water pipe and a temperature sensor; c. setting up a heat preservation shed; d. pouring the concrete, providing the poured concrete with water for temperature reduction through the cooling water pipe, controlling the temperature of the heat preservation shed to preserve heat and pouring low-heat cement; and e. stretching a temporary prestressing tendon. When a second bin of concrete is poured, the temporary prestressing tendon is arranged. The construction method adopting the combined use of temperature control and the temporary prestressing tendon can effectively control temperature stress in the concrete, and can prevent harmful cracks from being produced.
Description
[technical field]
The present invention relates to a kind of concrete in mass three dimension prestressing concrete construction method of holding concurrently, No. 0 block anti-cracking construction method of the big span continuous rigid structure bridge of especially high pier.
[background technology]
Fast development along with China's communication, the big span continuous rigid structure bridge of high pier obtains promotion and application in the bridge engineering field, No. 0 piece of the big span continuous rigid structure bridge of high pier belongs to the concrete in mass three dimension prestressing concrete category of holding concurrently, influence owing to thermal stresses in the practice of construction very easily produces the crack, if fracture propagation has influence on the work of prestressing tendon, to there be very big potential safety hazard during this bridge operation, prevent that the generation in No. 0 harmful crack of piece from being a great technical barrier.The mechanism that the crack produces: the crack is caused by temperature difference between inside and outside concrete that mainly at the concrete temperature raising period, stress distribution law is that inside concrete is a compressive stress, the outside is a tensile stress, because the age of concrete is less, tensile strength is also less, and concrete is easy to from face checking.In the concrete cooling phase, the internal temperature fall produces tensile stress much larger than outside concrete temperature decline scope at inside concrete, and concrete easily ftractures internally, is easy to be diffused into surface formation then and runs through harmful crack.
[summary of the invention]
The objective of the invention is to unite use, control the thermal stresses in the concrete, provide the big span continuous rigid structure bridge of a kind of high pier No. 0 block anti-cracking construction method by temperature control and interim prestressing tendon.
The object of the present invention is achieved like this: No. 0 block anti-cracking construction method of the big span continuous rigid structure bridge of a kind of high pier, on the pier roof panel, divide the secondary concreting, perfusion is to 0.3～0.6 times of web height for the first time, pour into for the second time remainder, two layer concretes are controlled within 15 days the length of time, may further comprise the steps:
A, preparation of construction, template is installed, and presstressed reinforcing steel is installed, is fixed.
B, cooling water pipe and temperature inductor are installed.Cooling water pipe is installed: cooling water pipe adopts light-wall pipe, and spacing is 50～80cm, and one deck is arranged in the centre position of base plate, and pressure testing before noting using prevents to leak.Web and diaphragm all are provided with 1～3 layer of cooling water pipe during the 2nd perfusion.Temperature inductor is buried underground: mainly be arranged in the positive center of base plate, diaphragm and web base plate intersection, the center of web centre and the position of web surface.
C, set up the insulation canopy, the insulation canopy requires totally-enclosed (comprising bed die), insulation canopy cladding material adds one deck colour bar cloth with one deck geotextiles and covers, and geotextiles and colour bar cloth all require to sew up firmly stuffy, and the turnover people can seal at any time with the local requirement that needs interim transport of materials.Insulation canopy requirement for height can satisfy concrete perfusion the 2nd time.
D, concrete perfusion use the low head of hydratation cement perfusion, after concreting is put in storage, before last layer concrete covers, are the temperature of building of this layer concrete apart from the temperature at concrete surface 10～15cm place.Temperature of concrete during construction is minimum must not be less than 10 ℃, the highest must not be greater than 30 ℃.
E, temperature control and maintenance in the concrete temperature rise period, are measured its temperature respectively by the connector lug that mobile portable temperature measuring device and temperature inductor expose, and concreting promptly can the water flowing cooling after covering cooling water pipe.The table temperature difference should be above 25 ℃ in the concrete.Main reading and other temperature inductor difference of readings that relatively are embedded in the temperature inductor of web surface, if soon above 25 ℃, should strengthen the frequency and the flow of water flowing immediately, the temperature difference is controlled at below 25 ℃, this control method embodies the control main points of cooling when heating up.When the temperature of measuring temperature inductor begins to descend, notice that the control rate of temperature fall should not surpass 1.5～2.0 ℃/d.Concrete requires to guarantee temperature of shed 18～20 degree at temperature-fall period.Main light a fire stove heating and the iodine-tungsten lamp of adopting heats the measure of grade at a distance, and this measure meets the control main points that are incubated when lowering the temperature.For concrete casting intact after, use the geotextiles covering and heat insulating all around.Inner chamber utilizes the hot water of cooling water pipe delivery port to carry out the retaining health.Pay special attention to case beam inner chamber and ventilate, locate outside heat extraction air with blast fan in the people hole of dividing plate, it is the air-vent of 20～40cm that diameter is stayed at the top board place, and cavity temperature is not higher than 20 ℃ in guaranteeing.When the inner chamber air themperature has little time to discharge, water pipe can be connect shower nozzle and water is become water smoke come heat of cooling air.The maintenance of sprinkling water after the initial set of case top surface of the beam covers one deck geotextiles and preserves moisture.And proper extension striking time to 7～10 day, striking time should be selected the higher period of temperature in one day, with the table temperature difference in reducing, prevents thermal cracking.
F, the interim prestressing tendon of stretch-draw.When pouring into the second storehouse concrete, interim prestressing tendon setting: the vertical bridge in place is to from the 1st concrete surface 50cm place and top board elongated steel hinge line bundle that is provided with of 150cm down up in the middle of the per pass web, every bundle steel hinge line is made up of 12～22 high strength low relaxed steel strand, and tension stress is 1395MPa to the maximum under the anchor of prestressing tendon.Stress test adopts intellectual vibratory strain ga(u)ge and supporting vibratory string detector, begins stretch-draw after intensity reaches 50%.During construction by the order stretch-draw that gets on, get off.Strain meter is the difference reading before and after stretch-draw, calculates the compressive stress that stretch-draw produces by the reading value of measuring vibratory strain ga(u)ge, and compressive stress is controlled at 1～2Mpa promptly can stop stretch-draw.Interim prestressing tendon was put a grouting treatment after 20 days ages of concrete.
Owing to take temperature control and interim prestressing tendon to unite the job practices of use,, prevent that harmful crack from producing so the present invention can control the thermal stresses in the concrete effectively.The two river mouths of Shanghai, Hubei Rong Xi speedway grand bridge has successfully used temperature control to add the job practices of interim prestressing tendon anticracking, has obtained good effect.
[description of drawings]
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a construction plan of the present invention.
Fig. 2 is the lateral view of Fig. 1.
Fig. 3 is an insulation canopy schematic diagram.
Fig. 4 is the 1st perfusion base plate cooling water pipe and temperature inductor layout vertical view.
Fig. 5 is the 2nd perfusion base plate cooling water pipe and temperature inductor layout vertical view.
Fig. 6 is No. 0 piece operation platform arrangement diagram.
Wherein, Fig. 1 double as Figure of abstract.
[specific embodiment]
As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, No. 0 block anti-cracking construction method of the big span continuous rigid structure bridge of a kind of high pier shown in Figure 6, on Fig. 6 operation platform, divide the secondary concreting, perfusion is to dividing storehouse line 5 (0.3～0.6 times of web height) for the first time, pour into for the second time remainder, two layer concretes are controlled within 15 days the length of time, may further comprise the steps:
Pour into the first storehouse concrete.A, preparation of construction, bed die is installed, and outer side form installs and fixes, and web, diaphragm vertical prestressing bar are installed, are fixed.B, installation cooling water pipe and temperature inductor.Cooling water pipe is installed: cooling water pipe 4 adopts the light-wall pipe of Φ 50*3.0, and the spacing of direction across bridge is 50cm, and one deck is arranged in the centre position of base plate, and pressure testing before noting using prevents to leak.Notice that water inlet requires to be installed to the same side for making things convenient for water flowing.Temperature inductor is buried underground: temperature inductor 3 is buried 4 underground, mainly is arranged in the positive center of base plate, diaphragm 21 and web 13 base plate intersections, the center of web centre and the position of web surface.C, set up the insulation canopy, the insulation canopy requires totally-enclosed (comprising bed die), insulation canopy cladding material adds the covering of one deck colour bar cloth with the geotextiles of one deck 350 gram/square meters, geotextiles and colour bar cloth all require to sew up firmly stuffy, and the turnover people can seal at any time with the local requirement that needs interim transport of materials.Insulation canopy requirement for height can satisfy concrete perfusion the 2nd time.Insulation canopy backing material is set up with the 80*100cm distance with Φ 48*3.5 scaffolding steel pipe, and scaffolding steel pipe is supported on bed die 24 truss and the cantilever segment carriage.D, perfusion be concrete for the first time, uses the low head of hydratation cement perfusion, after concreting is put in storage, before last layer concrete covers, is the temperature of building of this layer concrete apart from the temperature at concrete surface 10～15cm place.Temperature of concrete during construction is minimum must not be less than 10 ℃, the highest must not be greater than 30 ℃.E, temperature control and maintenance in the concrete temperature rise period, are measured its temperature respectively by the connector lug that mobile portable temperature measuring device and temperature inductor expose, and concreting promptly can the water flowing cooling after covering cooling water pipe.The table temperature difference should be above 25 ℃ in the concrete.Main reading and other 3 temperature inductor difference of readings that relatively are embedded in the temperature inductor of web surface, if soon above 25 ℃, should strengthen the frequency and the flow of water flowing immediately, the temperature difference is controlled at below 25 ℃, this control method embodies the control main points of cooling when heating up.When the temperature of measuring temperature inductor begins to descend, notice that the control rate of temperature fall should not surpass 2.0 ℃/d.Concrete requires to guarantee about temperature of shed 20 degree at temperature-fall period.Main light a fire stove heating and the iodine-tungsten lamp of adopting heats the measure of grade at a distance, and this measure meets the control main points that are incubated when lowering the temperature.For concrete casting intact after, use the geotextiles covering and heat insulating all around.And proper extension striking time to 7 day, striking time should be selected the higher period of temperature in one day, with the table temperature difference in reducing, prevents thermal cracking.Inner chamber utilizes the hot water of cooling water pipe delivery port to carry out the retaining health.
Pour into the second storehouse concrete.A, preparation of construction, colligation web and diaphragm reinforcing bar, web, diaphragm vertical prestressing bar are installed, are fixed, and the web bellows is installed, is fixed, and internal mold and termination mould, top board bed die are installed, and colligation top board reinforcing bar, top board transverse prestress muscle are installed, are fixed.In case web place easy to crack such as web 1/2 place and web inner chamber chamfering place, add the anticracking reinforced mesh when pouring into the second storehouse concrete.Cooling water pipe and temperature inductor are poured in b, installation for the second time.Cooling water pipe is installed: cooling water pipe adopts the light-wall pipe of Φ 50*3.0, and web and diaphragm all are provided with 3 layers, and pressure testing before noting using prevents to leak.Notice that water inlet requires to be installed on the top board platform to making things convenient for water flowing.Temperature inductor is buried underground: temperature inductor is buried 3 underground, mainly is arranged in the position of middle center, diaphragm and web base plate intersection and web surface of the 2nd layer concrete web.C, perfusion be concrete for the second time, uses the low head of hydratation cement perfusion, after concreting is put in storage, before last layer concrete covers, is the temperature of building of this layer concrete apart from the temperature at concrete surface 10～15cm place.Temperature of concrete during construction is minimum must not be less than 10 ℃, the highest must not be greater than 30 ℃.D, temperature control and maintenance in the concrete temperature rise period, are measured its temperature respectively by the connector lug that mobile portable temperature measuring device and temperature inductor expose, and concreting promptly can the water flowing cooling after covering cooling water pipe.The table temperature difference should be above 25 ℃ in the concrete.Main reading and other 2 temperature inductor difference of readings that relatively are embedded in the temperature inductor of web surface, if soon above 25 ℃, should strengthen the frequency and the flow of water flowing immediately, the temperature difference is controlled at below 25 ℃, strengthen the inner chamber exhaust cooling simultaneously, this control method embodies the control main points of cooling when heating up.When the temperature of measuring temperature inductor begins to descend, notice that the control rate of temperature fall should not surpass 2.0 ℃/d.Concrete requires to guarantee about temperature of shed 20 degree at temperature-fall period.Main light a fire stove heating and the iodine-tungsten lamp of adopting heats the measure of grade at a distance, and this measure meets the control main points that are incubated when lowering the temperature.For concrete casting intact after, use the geotextiles covering and heat insulating all around.Pay special attention to case beam inner chamber and ventilate, at the outside heat extraction air in 7 places, people hole of dividing plate, the 30*30cm air-vent is stayed at top board 8 places with blast fan, and cavity temperature is not higher than 20 ℃ in guaranteeing.When the inner chamber air themperature has little time to discharge, water pipe can be connect shower nozzle and water is become water smoke come heat of cooling air.The maintenance of sprinkling water after the initial set of case top surface of the beam covers one deck geotextiles and preserves moisture.And proper extension striking time to 7 day, striking time should be selected the higher period of temperature in one day, with the table temperature difference in reducing, prevents thermal cracking.E, the interim prestressing tendon of stretch-draw.When pouring into the second storehouse concrete, interim prestressing tendon setting: in the middle of the per pass web the vertical bridge in place to from the 1st concrete surface up 50cm place and top board down 150cm is elongated respectively is provided with 1 and restraints steel strand 2, every bundle steel hinge line is made up of 19～22 Φ, 15.24 high strength low relaxed steel strand, stress test adopts intellectual vibratory strain ga(u)ge 1 and supporting vibratory string detector, intensity reaches the interim prestressing force of 50% post tensioning, during concrete construction such as the C55 concrete can the interim prestressing force of stretch-draw when intensity reaches 30Mpa, can pretensioning bottom steel twisted wire, post tensioning upper steel twisted wire.Strain meter is the difference reading before and after stretch-draw, calculates the compressive stress that stretch-draw produces by the reading value of measuring vibratory strain ga(u)ge, and the compressive stress scope is controlled at 1～2Mpa promptly can stop stretch-draw.Interim prestressing tendon was put a grouting treatment after 20 days ages of concrete.
Claims (1)
1, No. 0 block anti-cracking construction method of the big span continuous rigid structure bridge of a kind of high pier, divide the secondary concreting on the pier roof panel, perfusion is for the first time poured into for the second time remainder to 0.3～0.6 times of web height, two layer concretes are controlled within 15 days the length of time, may further comprise the steps:
A, preparation of construction, template is installed, and presstressed reinforcing steel is installed, is fixed;
B, cooling water pipe and temperature inductor are installed.One deck cooling water pipe (4) is arranged in the centre position of base plate, and web and diaphragm all are provided with 1～3 layer of cooling water pipe during the 2nd perfusion, and cooling water pipe adopts light-wall pipe, and spacing is 50～80cm.Temperature inductor is arranged in the positive center of base plate, diaphragm (21) and web (13) base plate intersection, the center of web centre and the position of web surface;
C, set up the insulation canopy, the insulation canopy requires totally-enclosed (comprising bed die), insulation canopy cladding material adds one deck colour bar cloth with one deck geotextiles and covers, and geotextiles and colour bar cloth all require to sew up firmly stuffy, and the turnover people can seal at any time with the local requirement that needs interim transport of materials;
D, concrete perfusion use the low head of hydratation cement perfusion, after concreting is put in storage, before last layer concrete covers, are the temperature of building of this layer concrete apart from the temperature at concrete surface 10～15cm place.Temperature of concrete during construction is minimum must not be less than 10 ℃, the highest must not be greater than 30 ℃;
E, temperature control and maintenance, concreting promptly can be lowered the temperature after covering cooling water pipe in water flowing, and the table temperature difference is no more than 25 ℃ in the concrete., when temperature is raising, should strengthen the frequency and the flow of water flowing immediately, the temperature difference is controlled at below 25 ℃, this control method embodies the control main points of cooling when heating up.Notice that the control rate of temperature fall should not surpass 1.5～2.0 ℃/d.Concrete requires to guarantee temperature of shed 18～20 degree at temperature-fall period.Main light a fire stove heating and the iodine-tungsten lamp of adopting heats the measure of grade at a distance, and this measure meets the control main points that are incubated when lowering the temperature.For concrete casting intact after, use the geotextiles covering and heat insulating all around.The maintenance of sprinkling water after the initial set of case top surface of the beam covers one deck geotextiles and preserves moisture, and proper extension striking time to 7～10 day, and striking time should be selected the higher period of temperature in one day, with the table temperature difference in reducing, prevents thermal cracking;
F, the interim prestressing tendon of stretch-draw.When pouring into the second storehouse concrete, interim prestressing tendon setting: the vertical bridge in place is to from the 1st concrete surface 50cm place and top board elongated steel hinge line bundle (2) that is provided with of 150cm down up in the middle of the per pass web, every bundle steel hinge line is made up of 12～22 high strength low relaxed steel strand, and tension stress is 1395MPa to the maximum under the anchor of prestressing tendon.Stress test adopts intellectual vibratory strain ga(u)ge (1) and supporting vibratory string detector, begins stretch-draw after intensity reaches 50%.During construction by the order stretch-draw that gets on, get off.Strain meter is the difference reading before and after stretch-draw, calculates the compressive stress that stretch-draw produces by the reading value of measuring vibratory strain ga(u)ge, and the compressive stress scope is controlled at 1～2Mpa promptly can stop stretch-draw.Interim prestressing tendon was put a grouting treatment after 20 days ages of concrete.
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| CN114481840A (en) * | 2021-12-28 | 2022-05-13 | 交通运输部公路科学研究所 | Method for sectionally pouring ultrahigh and oversized pier top zero-number block through double-stress system |
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