1. The high-performance concrete construction technology applied to the expansion joint steel box girder side is characterized in that the operation procedure comprises chiseling epoxy asphalt pavement on the expansion joint steel bridge deck side, sand blasting for rust removal, epoxy resin adhesive, stone chips scattering, ultra-high performance concrete mixing, pouring and curing.

2. The high-performance concrete construction technology applied to the steel box girder side of the expansion joint as claimed in claim 1, wherein the cement is compatible with a water reducing agent, the content of the silicate cement is low, and the powder degree of the cement is not too high so as not to increase the water content and influence the compactness.

3. The high performance concrete construction technique applied to the steel box girder side of the expansion joint as claimed in claim 1, wherein before the construction, a detailed construction organization design should be made, and the post training should be performed for the constructors of each process, a quality control system should be established, and an effective control method for determining the construction quality should be used to seal the steel bridge floor constructed in the road section, and during the construction, except for the necessary equipment personnel during the construction, the passage of any vehicle, tool and personnel is strictly prohibited, so as to ensure the cleanness and dryness of the working surface and the tidiness of the construction site, and prevent the pollution to the working surface during the construction and the working process; the bulk dry mixture should have uniform appearance and no caking or moisture phenomenon; the bagged dry mixture is completely packaged without bag breakage and dampness; mixing the fresh concrete according to the recommended water consumption, wherein the fluidity of the fresh concrete meets the construction requirement; the bending tensile strength of the concrete with the fluidity meeting the construction requirements is 1.15 times greater than the standard value of the corresponding strength grade.

4. The high-performance concrete construction technology applied to the steel box girder side of the expansion joint as claimed in claim 1, is characterized by comprising the following raw materials in parts by weight: 90-120 parts of cement, 42-64 parts of zinc-containing concrete auxiliary agent, 21-28 parts of II-grade fly ash, 19-25 parts of sand, 8-15 parts of flocculating agent, 12-19 parts of attapulgite fiber, 5-10 parts of calcium sulphoaluminate and 200-235 parts of sand.

5. The utility model provides a be applied to high performance concrete construction technique of expansion joint steel box girder side which characterized in that includes following step: the material comprises the following raw materials in parts by weight:

1) placing 90-120 parts by weight of cement, 42-64 parts by weight of zinc-containing concrete auxiliary agent, 21-28 parts by weight of II-grade fly ash, 19-25 parts by weight of sand, 8-15 parts by weight of flocculating agent, 12-19 parts by weight of attapulgite fiber, 5-10 parts by weight of calcium sulphoaluminate and 200-235 parts by weight of water into a concrete mixer for mixing at the mixing speed of 600-800r/min for 20-100min to prepare an underwater concrete material;

2) when the ultra-high performance concrete is constructed, the compression strength and the breaking strength are tested, each time of 20m or one group is tested, the batch size is less than 20m, and the test is considered according to 20 m;

3) uniformly dividing 3 layers of test blocks, pouring and forming until the mixture is slightly higher than the upper opening of the test mold, not using a tamping bar for tamping, and then placing on a vibration table for vibrating for 30s or continuously until the surface of the mixture is discharged;

4) conveying the underwater concrete material to an underwater pouring position through a winch, pouring after 50s, wherein the thickness of each pouring is 30mm, standing for 10s after each pouring is finished, and repeating for multiple times until the designed pouring position is reached;

5) curing the device for 1 to 5 days;

6) and (5) inspecting the cement, and draining water after the cement is qualified to finish construction.

Background

According to the requirements of design drawings, the steel bar is manufactured and bound, the template is placed and fixed, raw materials meeting the quality requirements are used, mixing, transportation, pouring, maintenance and the like are carried out according to the specified proportion, and meanwhile, the whole process quality control and inspection are carried out on all links.

Along with the increase of the service life of the bridge modulus expansion device, heavy-load vehicles are more, the traffic flow is large, the expansion device can be seriously damaged, if the expansion device is not changed in time, great potential safety hazards can be brought to traffic safety, epoxy asphalt concrete on the steel bridge deck side of a long-span bridge is inevitably damaged in the changing process, the small-area epoxy asphalt concrete repair has the defects of inconvenient paving, poor quality control, high unit area cost, high measure expense and the like, and because the epoxy asphalt concrete on the steel bridge deck is generally thin, the durability can not be ensured by adopting common concrete expansion joints, therefore, the novel ultrathin high-performance concrete repair and replacement of the damaged epoxy asphalt concrete pavement are planned.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a high-performance concrete construction technology applied to the steel box girder side of the expansion joint, which has the advantages of convenient paving, convenient quality control, low unit area cost, capability of ensuring durability and the like in green concrete repair, and solves the problems of inconvenient paving, poor quality control, high unit area cost and high measure cost.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the running procedure of the high-performance concrete construction technology applied to the expansion joint steel box girder side comprises chiseling epoxy asphalt pavement on the expansion joint steel bridge deck side, sand blasting for rust removal, epoxy resin adhesive, spreading stone chips, mixing ultra-high-performance concrete, pouring and maintaining.

Preferably, the cement is compatible with the water reducing agent, the content of the silicate cement is low, and the powder degree of the cement is not too high so as not to increase the water content and influence the compactness.

Preferably, before the construction, a detailed construction organization design is made, constructors of all processes are trained on the spot, a quality control system is established, an effective control method for determining the construction quality is used for sealing the steel bridge floor constructed in the road section, and during construction, except necessary equipment and personnel during construction, any vehicle, machine tool and personnel are strictly forbidden to pass, so that the cleanness and the dryness of the working surface and the tidiness of the construction site are ensured, and the pollution to the working surface during construction and working process is prevented; the bulk dry mixture should have uniform appearance and no caking or moisture phenomenon; the bagged dry mixture is completely packaged without bag breakage and dampness; mixing the fresh concrete according to the recommended water consumption, wherein the fluidity of the fresh concrete meets the construction requirement; the bending tensile strength of the concrete with the fluidity meeting the construction requirements is 1.15 times greater than the standard value of the corresponding strength grade.

Preferably, the feed comprises the following raw materials in parts by weight: 90-120 parts of cement, 42-64 parts of zinc-containing concrete auxiliary agent, 21-28 parts of II-grade fly ash, 19-25 parts of sand, 8-15 parts of flocculating agent, 12-19 parts of attapulgite fiber, 5-10 parts of calcium sulphoaluminate and 200-235 parts of sand.

The invention provides a high-performance concrete construction technology applied to the expansion joint steel box girder side, which comprises the following steps:

1) placing 90-120 parts by weight of cement, 42-64 parts by weight of zinc-containing concrete auxiliary agent, 21-28 parts by weight of II-grade fly ash, 19-25 parts by weight of sand, 8-15 parts by weight of flocculating agent, 12-19 parts by weight of attapulgite fiber, 5-10 parts by weight of calcium sulphoaluminate and 200-235 parts by weight of water into a concrete mixer for mixing at the mixing speed of 600-800r/min for 20-100min to prepare an underwater concrete material;

2) when the ultra-high performance concrete is constructed, the compression strength and the breaking strength are tested, each time of 20m or one group is tested, the batch size is less than 20m, and the test is considered according to 20 m;

3) uniformly dividing 3 layers of test blocks, pouring and forming until the mixture is slightly higher than the upper opening of the test mold, not using a tamping bar for tamping, and then placing on a vibration table for vibrating for 30s or continuously until the surface of the mixture is discharged;

4) conveying the underwater concrete material to an underwater pouring position through a winch, pouring after 50s, wherein the thickness of each pouring is 30mm, standing for 10s after each pouring is finished, and repeating for multiple times until the designed pouring position is reached;

5) curing the device for 1 to 5 days;

6) and (5) inspecting the cement, and draining water after the cement is qualified to finish construction.

(III) advantageous effects

Compared with the prior art, the invention provides a high-performance concrete construction technology applied to the steel box girder side of an expansion joint, which has the following beneficial effects:

this be applied to high performance concrete construction technique of expansion joint steel box girder side, this construction technique has higher intensity, can be under construction when the telescoping device is changed, through before the construction, the rust cleaning, the process of concrete placement clearance is laid to the pitch, the intensity of cement connection face when guaranteeing the construction, can make the intensity of cement increase, again through the requirement to the construction of cement, thereby can make the intensity and the construction convenience degree meet the requirements of cement, the concrete has higher durability, user's use has been made things convenient for.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows: 1) putting 90 parts by weight of cement, 42 parts by weight of zinc-containing concrete auxiliary agent, 21 parts by weight of II-grade fly ash, 19 parts by weight of sand, 8 parts by weight of flocculating agent, 12 parts by weight of attapulgite fiber, 5 parts by weight of calcium sulphoaluminate and 200 parts by weight of water into a concrete mixer for mixing at the mixing speed of 600r/min for 20min to prepare an underwater concrete material;

2) when the ultra-high performance concrete is constructed, the compression strength and the breaking strength are tested, each time of 20m or one group is tested, the batch size is less than 20m, and the test is considered according to 20 m;

3) uniformly dividing 3 layers of test blocks, pouring and forming until the mixture is slightly higher than the upper opening of the test mold, not using a tamping bar for tamping, and then placing on a vibration table for vibrating for 30s or continuously until the surface of the mixture is discharged;

4) conveying the underwater concrete material to an underwater pouring position through a winch, pouring after 50s, wherein the thickness of each pouring is 30mm, standing for 10s after each pouring is finished, and repeating for multiple times until the designed pouring position is reached;

5) curing the device for 1 day;

6) and (5) inspecting the cement, and draining water after the cement is qualified to finish construction.

Construction under special conditions

a) In rainy days: the construction of the ultra-high performance concrete bridge deck is to avoid construction in rainy seasons, if rainfall occurs in the paving process and the surface quality of a concrete layer is affected due to large rainfall, the construction is stopped, a plastic film is used for covering the constructed area and erecting a rain-proof shed, a rain-proof shed support is preferably made of a steel structure, and if the concrete layer is seriously damaged due to rainstorm, the concrete bridge deck is paved as early as possible;

b) construction in windy days: in a frequently windy area, plastic shrinkage cracking of just poured ultrahigh-performance concrete needs to be prevented, the main factors influencing the plastic shrinkage cracking are wind speed and windy days, the wind speed is measured on site by an anemometer or the natural phenomenon caused by windy is observed, the wind level is determined, when the wind power reaches 6 levels or above, pouring construction of the ultrahigh-performance concrete layer needs to be stopped in time, and meanwhile, a plastic film is covered on a poured part for moisture preservation and maintenance to prevent the plastic shrinkage cracking;

c) and (3) construction in summer: in summer, when the on-site temperature is higher than 30 ℃, the construction in the daytime should be avoided as much as possible, and the construction at night should be selected as much as possible, if the construction period is tight, the watering, moisturizing and curing of the ultra-high performance concrete layer of the poured part should be timely carried out when the construction period cannot be avoided, the temperature of the concrete mixture should not be ultra-high by 35 ℃ at any time, and the environmental temperature, the mixing water temperature and the bridge floor temperature should be concerned at any time during the construction in summer.

Example two: 1) placing 100 parts by weight of cement, 50 parts by weight of zinc-containing concrete auxiliary agent, 25 parts by weight of II-grade fly ash, 22 parts by weight of sand, 11 parts by weight of flocculating agent, 15 parts by weight of attapulgite fiber, 8 parts by weight of calcium sulphoaluminate and 111 parts by weight of water into a concrete mixer for mixing at the mixing speed of 700r/min for 60min to prepare an underwater concrete material;

2) when the ultra-high performance concrete is constructed, the compression strength and the breaking strength are tested, each time of 20m or one group is tested, the batch size is less than 20m, and the test is considered according to 20 m;

3) uniformly dividing 3 layers of test blocks, pouring and forming until the mixture is slightly higher than the upper opening of the test mold, not using a tamping bar for tamping, and then placing on a vibration table for vibrating for 30s or continuously until the surface of the mixture is discharged;

4) conveying the underwater concrete material to an underwater pouring position through a winch, pouring after 50s, wherein the thickness of each pouring is 30mm, standing for 10s after each pouring is finished, and repeating for multiple times until the designed pouring position is reached;

5) curing the device for 3 days;

6) and (5) inspecting the cement, and draining water after the cement is qualified to finish construction.

Construction under special conditions

a) In rainy days: the construction of the ultra-high performance concrete bridge deck is to avoid construction in rainy seasons, if rainfall occurs in the paving process and the surface quality of a concrete layer is affected due to large rainfall, the construction is stopped, a plastic film is used for covering the constructed area and erecting a rain-proof shed, a rain-proof shed support is preferably made of a steel structure, and if the concrete layer is seriously damaged due to rainstorm, the concrete bridge deck is paved as early as possible;

b) construction in windy days: in a frequently windy area, plastic shrinkage cracking of just poured ultrahigh-performance concrete needs to be prevented, the main factors influencing the plastic shrinkage cracking are wind speed and windy days, the wind speed is measured on site by an anemometer or the natural phenomenon caused by windy is observed, the wind level is determined, when the wind power reaches 6 levels or above, pouring construction of the ultrahigh-performance concrete layer needs to be stopped in time, and meanwhile, a plastic film is covered on a poured part for moisture preservation and maintenance to prevent the plastic shrinkage cracking;

c) and (3) construction in summer: in summer, when the on-site temperature is higher than 30 ℃, the construction in the daytime should be avoided as much as possible, and the construction at night should be selected as much as possible, if the construction period is tight, the watering, moisturizing and curing of the ultra-high performance concrete layer of the poured part should be timely carried out when the construction period cannot be avoided, the temperature of the concrete mixture should not be ultra-high by 35 ℃ at any time, and the environmental temperature, the mixing water temperature and the bridge floor temperature should be concerned at any time during the construction in summer.

Example three: 1) placing 120 parts by weight of cement, 64 parts by weight of zinc-containing concrete auxiliary agent, 28 parts by weight of II-grade fly ash, 25 parts by weight of sand, 15 parts by weight of flocculating agent, 19 parts by weight of attapulgite fiber, 5-10 parts by weight of calcium sulphoaluminate and 235 parts by weight of water into a concrete mixer for mixing at the mixing speed of 800r/min for 100min to prepare an underwater concrete material;

2) when the ultra-high performance concrete is constructed, the compression strength and the breaking strength are tested, each time of 20m or one group is tested, the batch size is less than 20m, and the test is considered according to 20 m;

3) uniformly dividing 3 layers of test blocks, pouring and forming until the mixture is slightly higher than the upper opening of the test mold, not using a tamping bar for tamping, and then placing on a vibration table for vibrating for 30s or continuously until the surface of the mixture is discharged;

4) conveying the underwater concrete material to an underwater pouring position through a winch, pouring after 50s, wherein the thickness of each pouring is 30mm, standing for 10s after each pouring is finished, and repeating for multiple times until the designed pouring position is reached;

5) curing the device for 5 days;

6) and (5) inspecting the cement, and draining water after the cement is qualified to finish construction.

Construction under special conditions:

a) in rainy days: the construction of the ultra-high performance concrete bridge deck is to avoid construction in rainy seasons, if rainfall occurs in the paving process and the surface quality of a concrete layer is affected due to large rainfall, the construction is stopped, a plastic film is used for covering the constructed area and erecting a rain-proof shed, a rain-proof shed support is preferably made of a steel structure, and if the concrete layer is seriously damaged due to rainstorm, the concrete bridge deck is paved as early as possible;

b) construction in windy days: in a frequently windy area, plastic shrinkage cracking of just poured ultrahigh-performance concrete needs to be prevented, the main factors influencing the plastic shrinkage cracking are wind speed and windy days, the wind speed is measured on site by an anemometer or the natural phenomenon caused by windy is observed, the wind level is determined, when the wind power reaches 6 levels or above, pouring construction of the ultrahigh-performance concrete layer needs to be stopped in time, and meanwhile, a plastic film is covered on a poured part for moisture preservation and maintenance to prevent the plastic shrinkage cracking;

c) and (3) construction in summer: in summer, when the on-site temperature is higher than 30 ℃, the construction in the daytime should be avoided as much as possible, and the construction at night should be selected as much as possible, if the construction period is tight, the watering, moisturizing and curing of the ultra-high performance concrete layer of the poured part should be timely carried out when the construction period cannot be avoided, the temperature of the concrete mixture should not be ultra-high by 35 ℃ at any time, and the environmental temperature, the mixing water temperature and the bridge floor temperature should be concerned at any time during the construction in summer.

Experimental example: detection item allowable error detection method and frequency

Thickness of concrete layer +/-5 mm

The straight steel wire is inserted into the bottom of the concrete layer,

the depth of immersion of the wire was measured with a ruler, measuring 1 spot every 50m

The longitudinal and transverse gradient +/-0.2% of the bridge floor is measured by a level gauge and a tape measure, and 1 position is detected every 50m

Bridge deck flatness +/-5 mm

Measuring with a 1m level and a clearance gauge, placing the level at any position of the bridge floor,

and measuring the gap between the level bar and the bridge floor by using a feeler gauge, and detecting 1 position every 50 m.

And (4) judging the standard:

28d flexural strength/MPa more than or equal to 20GB/T31387-2015

28d cube compressive strength/MPa is more than or equal to 120GB/T31387-2015

The elastic modulus/GPa is more than or equal to 40GB/T50081-2002

Slump expansion/mm is more than or equal to 650GB/T50080-2016

The apparent density/kg/m 3 is not more than 2350GB/T50080-2016

The invention has the beneficial effects that: this construction technology has higher intensity, can be under construction when the telescoping device is changed, through before the construction, the rust cleaning, the process of asphalt pavement concrete placement clearance, the intensity of cement face when guaranteeing the construction can make the intensity increase of cement, again through the requirement to the construction of cement to can make the intensity and the construction convenience degree accord with the requirement of cement, the concrete has higher durability, has made things convenient for user's use.

Typical cases are as follows: a) the bulk dry mixture should have uniform appearance and no caking or moisture phenomenon;

b) the bagged dry mixture is completely packaged without bag breakage and dampness;

c) mixing the fresh concrete according to the recommended water consumption, wherein the fluidity of the fresh concrete meets the construction requirement;

d) the bending tensile strength of the concrete with the fluidity meeting the construction requirements is 1.15 times greater than the standard value of the corresponding strength grade.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.