CN111648256A - Pier body reinforcing construction method - Google Patents

Pier body reinforcing construction method Download PDF

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Publication number
CN111648256A
CN111648256A CN202010454018.4A CN202010454018A CN111648256A CN 111648256 A CN111648256 A CN 111648256A CN 202010454018 A CN202010454018 A CN 202010454018A CN 111648256 A CN111648256 A CN 111648256A
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China
Prior art keywords
pier
concrete
template
pier body
reinforcing
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CN202010454018.4A
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Chinese (zh)
Inventor
杨思宏
孔彪
张建立
李晓鹏
黄虎
赵福龙
侯晓飞
杨毅
李琪
张晓瑶
刘扬
王青松
李文杰
李建峰
郭浩
刘晓伟
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China Railway Sixth Group Co Ltd
Taiyuan Railway Construction Co Ltd of China Railway Sixth Group Co Ltd
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China Railway Sixth Group Co Ltd
Taiyuan Railway Construction Co Ltd of China Railway Sixth Group Co Ltd
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Application filed by China Railway Sixth Group Co Ltd, Taiyuan Railway Construction Co Ltd of China Railway Sixth Group Co Ltd filed Critical China Railway Sixth Group Co Ltd
Priority to CN202010454018.4A priority Critical patent/CN111648256A/en
Publication of CN111648256A publication Critical patent/CN111648256A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/02Piers; Abutments ; Protecting same against drifting ice

Abstract

The invention relates to the field of bridge construction, in particular to a pier body reinforcing construction method; the method comprises the following steps: construction preparation, excavation of a bearing platform foundation, erection of a scaffold, chiseling treatment of a pier body, positioning and paying off of a drill hole, drilling of the pier body and the bearing platform, planting of ribs on the pier body and the bearing platform, binding of protective face reinforcing steel bars, assembling and adjusting of templates, mixing and transporting of concrete, pouring of concrete, curing of the concrete, removal of the templates and later curing of the concrete; the method adopts the wooden template to carry out pier reinforcement construction, reduces the construction cost, has simple template assembly and light hoisting, is suitable for pier hoop reinforcement construction of the rectangular pier of the railway bridge of the existing business line, meets the requirement on the template strength, is flexible to disassemble and convenient to carry, and provides good conditions for quick work circulation.

Description

Pier body reinforcing construction method
Technical Field
The invention relates to the field of bridge construction, in particular to a pier body reinforcing construction method.
Background
The railway freight is taken as a leading head of a transportation enterprise, the current situation that the freight transportation amount is increased year by year puts higher and tighter requirements on railway transportation infrastructure, particularly for existing bridges which are long in construction years, low in design grade and not matched with electrified facilities, the phenomena of speed limitation and speed reduction occur in the operation section of a train due to various bridge diseases caused by long service time.
The electrochemical transformation engineering JTDHGZ-SG1 standard section from Changping railway to hump section, which is built by six departments of Central iron, comprises 5 designed rectangular piers to reinforce the bridge, and 29 piers in total, the scheme is C35 concrete with 30cm thickness of anchor ear outside the existing pier body, which belongs to B-type construction of adjacent business lines, and during construction, the train operation speed should not exceed 45 km/h. Similar to the pier reinforcing method under the condition, the problems of high cost, difficult hoisting under the operation bridge and the like exist.
Disclosure of Invention
The invention provides a pier body reinforcing construction method for solving the technical problems of high cost and difficulty in hoisting under an operation bridge existing in a business line railway bridge pier reinforcing method, and construction is carried out by adopting a construction scheme of splicing wood templates.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a pier body reinforcing construction method comprises the following steps:
(1) excavating a foundation, namely excavating soil on the outer side of the pier body, wherein the excavating width is 1m of the outer side of the pier body;
(2) erecting a scaffold;
(3) chiseling the pier body, namely cleaning up impurities such as soil, concrete laitance and the like on the surface of the pier body, and mechanically chiseling the surfaces of the pier body and a bearing platform by adopting a light electric hammer tool, wherein the chiseling standard is that existing concrete coarse aggregate is exposed, and the aggregate is uniformly distributed;
(4) pier shaft, cushion cap drilling carry out accurate laying-out according to the design drawing on pier shaft, cushion cap, and drilling depth pier shaft is not less than 35cm, and the cushion cap is not less than 60cm, and the diameter of pier shaft drilling is 25mm, and the diameter of cushion cap drilling is respectively: the rectangular pier is 20mm, and the circular pier and the flexible pier are 27 mm; the drilling is perpendicular with pier shaft, cushion cap surface, and the straightness deviation allowed that hangs down: the pier body is less than or equal to 3 percent; the bearing platform is less than or equal to 5 percent, and the horizontal drilling hole cannot be inclined upwards;
(5) planting ribs on a pier body and a bearing platform, wherein the implanted ribs are arranged in a quincunx shape with the horizontal spacing of 60cm and the vertical spacing of 30cm, after holes are drilled and cleaned, A-grade steel bar planting glue is poured, anchor bars are inserted after the steel bar planting glue is poured, the anchoring length of the pier body steel bar planting is not less than 35cm, and the anchoring length of the bearing platform steel bar planting is not less than 60 cm; pier shaft anchor all adopts diameter 25mmHRB400 screw-thread steel, and the reinforcing bar that vertical anchor goes into the cushion cap is the vertical reinforcing bar of armor respectively: the rectangular pier adopts 16mmHRB400 deformed steel bar, and the circular pier and the flexible pier adopt 22mmHRB400 deformed steel bar;
(6) binding protective face reinforcing steel bars, connecting outer-coated pier body vertical reinforcing steel bars with a bearing platform and combining the outer-coated pier body vertical reinforcing steel bars with anchoring ribs, wherein the rectangular pier vertical reinforcing steel bars are threaded reinforcing steel bars with the diameter of 16mmHRB400, and the anchoring depth is not less than 60 cm; the horizontally distributed reinforcing steel bars adopt threaded reinforcing steel bars with the diameter of 12mmHRB 400;
(7) the template assembling and reinforcing method comprises the following steps:
a. template fabrication
Firstly, template material: the bamboo plywood is 1.6cm thick, 5 multiplied by 10cm vertical edge square wood, 48 multiplied by 3.5mm steel pipe for transverse edge, and double nuts matched with 16mm high-strength opposite-pulling screws for opposite pulling;
secondly, a reinforcing scheme is adopted, the vertical-edge square wood outside the bamboo plywood is arranged at intervals of 15cm, the transverse-edge double steel pipes outside the square wood are arranged at intervals of 60cm, and a 16mm high-strength split-bar rod and the planting single-side lap welding of the pier body are adopted for fixing;
b. formwork installation
Firstly, the height of each pouring is 3.66 m;
uniformly coating a release agent, covering with a plastic film, and waiting for installation;
thirdly, the template is installed by adopting automobile hoisting, the erected template is adjusted under the coordination of measuring personnel, the position and the elevation of the template are adjusted, the template is fixed after the adjustment meets the requirements, and the caulking treatment is carried out on the seam of the template;
fourthly, when the pier shaft template is installed, a concrete cushion block is used for supporting a cushion between the steel bar and the template;
fifthly, adjusting the position and the verticality of the template after the template is installed;
sixthly, after the plane position and the elevation of the template are measured accurately, the reinforcement condition of the template and the cleanness of the inner surface of the template are checked;
(8) pouring concrete; before the concrete is put into a mold, working performances of the concrete, such as temperature, slump, air content and the like, are measured, the slump is controlled to be 180mm, and the control deviation is +/-20 mm;
(9) removing the template;
(10) and (5) curing the concrete.
Further, in the step (3), after the chiseling is finished, concrete dust and sundries are cleaned up by an air compressor, and if the concrete dust and the sundries have adhesive sundries such as soil, the concrete dust and the sundries are washed clean by clean water.
Further, the grade A steel bar planting adhesive in the step (5) is a modified epoxy resin adhesive or a modified vinyl ester adhesive.
Furthermore, in the step (7) b, the strength of the concrete cushion block is not less than the designed pier body concrete strength, the cushion block is required to be perpendicular to the inner surface of the pier body template, and the phenomenon that the cushion block is separated from the template or obliquely propped against the template is strictly prohibited; the cushion blocks are arranged in a staggered manner and are arranged in a quincunx manner, and the cushion blocks cannot traverse the whole cross section of the protective layer; the number of the cushion blocks is not less than 4 per square meter.
Further, in the step (9), the form removal of the concrete can be carried out when the strength of the concrete of the side form reaches more than 2.5MPa, and the surface and the edges of the side form are not damaged by the form removal; the form removal is carried out reversely according to the order of the vertical form without damaging the concrete, and the form is detached and lifted after being separated from the concrete; when the form is removed, the temperature difference between the concrete and the surface layer concrete and the temperature difference between the surface layer concrete and the environment are not more than 15 ℃; in hot and dry seasons, the mold removal process of removing the mold section by section, removing the side cover while removing, watering while removing or spraying the curing agent while removing is adopted.
Compared with the prior art, the invention has the following beneficial effects:
1. the method adopts simple and easy assembly of the wood templates, adopts bamboo plywood with the thickness of 1.6cm, square wood with the vertical edge of 5 multiplied by 10cm and steel pipes with the transverse edge of phi 48 multiplied by 3.5mm, adopts a 16mm high-strength split-bar bolt to be in single-side lap welding with the embedded steel bars of the pier body, and is matched with a mountain-shaped clamp and a double nut for auxiliary construction, and the stress is uniform, firm, safe and reliable.
2. The wood formwork has small dead weight and is light to hoist, and compared with a steel formwork, the wood formwork has small dead weight and can be directly assembled on site, so that the problems that a crane in a limited site cannot support the wood formwork, the hoisting below an existing bridge is difficult and the like are solved.
3. The wood formwork is smooth in surface, flexible, drillable and low-temperature resistant, is beneficial to winter construction, the wood formwork is smooth in surface, sawable, drillable and low-temperature resistant, is beneficial to winter construction, and is convenient to disassemble and assemble, simple to operate and high in engineering development speed.
4. The wood formwork is used for pier reinforcement construction, construction cost is reduced, the wood formwork is suitable for pier hoop reinforcement construction of rectangular piers of railway bridges of existing business lines, the strength of the formwork meets requirements, the disassembly is flexible, the carrying is convenient, and good conditions are provided for quick work circulation.
Drawings
Fig. 1 is a diagram of a bar planting drilling in step (4) of the embodiment of the present invention.
Fig. 2 is a diagram of the horizontal reinforcing steel bars of the rectangular pier anchored into the pier body in the step (5) of the embodiment of the invention.
Fig. 3 is a diagram of the rectangular pier anchored into the vertical reinforcement of the bearing platform in step (5) of the embodiment of the invention.
Fig. 4 is a diagram showing the arrangement of the longitudinal reinforcing bars of the rectangular pier in step (6) of the embodiment of the invention.
The figures are labeled as follows:
1-existing stone pier body concrete, 2-drilling holes, and 3-structural anchoring adhesive.
Detailed Description
The present invention is further illustrated by the following specific examples.
Examples
Taking an example of an electrochemical transformation engineering JTDHGZ-SG1 standard section cattle river bridge at the Changping to hump section of the Jingtong railway as an example, the pier body reinforcement is carried out by adopting the following steps:
(1) foundation excavation
Before the pier body is reinforced, the soil body outside the pier body is excavated, the excavation width is 1m outside the pier body, the anchoring of the anchor is ensured to enter the working face of the steel bar and the template installation, and the excavation depth is increased to the top surface of the bearing platform of the existing pier. The excavation adopts the operation of manual cooperation miniature excavator, and the butt joint of machinery operation preceding and relevant equipment management unit confirms whether there are equipment such as light, cable in the excavation scope to the manual excavation cable probing ditch before the excavation, ensures equipment safety, and the earthwork of excavation selects suitable district to stack on the spot, and cover with dustproof green net, waits that the pier reinforcement accomplishes the backfill and uses. According to the on-site condition during construction, the steel sheet piles influencing the stability of the roadbed are protected, and the existing engineering structure and operation safety are prevented from being endangered.
(2) Scaffold erection
Technical requirements and quality standards:
scaffold parameters: the distance between the longitudinal rods is 1.2m, the distance between the transverse rods is 1.5m, and the row spacing is 0.9 m. The distance between the inner rows of the scaffold and the template is 40cm, and the extending length of the small cross rod is 10 cm; the longitudinal floor sweeping rod is fixed on the vertical rods which are not more than 20cm away from the base by adopting right-angle fasteners, and the inside and outside vertical rods are fully paved with scaffold boards. The steel pipe for scaffold is 48X 3.5 mm.
② the scaffold must be provided with a cross brace. The scissors should be built up gradually as the scaffolding is raised.
And thirdly, constructing the foundation and the foundation of the scaffold, wherein the original soil or the backfill soil must be tamped in advance according to the height of the scaffold, and a 5cm thick wood board is laid at the bottom of the backfill soil top pipe, if the bearing platform is buried shallowly, the scaffold can be directly erected on the bearing platform.
Fourthly, the scaffold must be erected in coordination with the construction progress, the height of the scaffold once erected should not exceed the height of the pier body formwork, and the stability of the erection process is guaranteed.
And fifthly, checking the step pitch, the longitudinal pitch, the transverse pitch and the verticality of the vertical rod according to the regulations after the scaffold is taken for one step.
Sixthly, stopping the scaffold erecting operation in the windy or rainy or snowy weather of six or more grades. The operation of putting on the shelf after rain and snow needs to pay attention to skid resistance and take skid resistance measures.
Seventhly, materials are strictly forbidden to be stacked on the scaffold on the non-operation layer and must be kept clean, the materials on the scaffold on the operation layer cannot be stacked in a centralized mode and cannot be ultrahigh and stacked stably, the stacking amount per square meter cannot exceed 300kg, and the materials are timely removed and cleaned after work is finished.
And eighthly, dismantling the scaffold to set a warning line, hanging a striking warning mark, forbidding non-operators and ground constructors to pass, and setting a special person for warning and nursing.
Ninthly, piling the disassembled steel pipes and fasteners in a classified mode, and strictly prohibiting high-altitude throwing.
(3) Roughening treatment of pier body
And cleaning up impurities such as soil, concrete laitance and the like on the surface of the pier body. And (3) mechanically chiseling the surfaces of the pier body and the bearing platform by adopting tools such as a light electric hammer and the like. The standard of chiseling is to expose the existing concrete coarse aggregate, the aggregate is uniformly distributed, and chiseling must be sufficient to ensure that the newly poured concrete and the existing concrete of the pier body are well bonded. And after the chiseling is finished, cleaning concrete dust and sundries by using an air compressor, and washing the adhesive sundries such as soil by using clean water.
(4) Drilling pier body and bearing platform
And (3) carrying out accurate lofting on the pier body and the bearing platform according to a design drawing, then drilling by adopting special drilling equipment, preferably adopting a diamond thin-wall hollow drill core-taking hole, wherein the drilling depth of the pier body is not less than 35cm, and the drilling depth of the bearing platform is not less than 60 cm. The diameter of pier shaft drilling is 25mm, and the diameter of cushion cap drilling is respectively: rectangular pier 20mm, circular pier and flexible pier 27 mm. The drilling is perpendicular with pier shaft, cushion cap surface, and the straightness deviation allowed that hangs down: the pier body is less than or equal to 3 percent; the bearing platform is less than or equal to 5 percent, and the horizontal drilling hole cannot be inclined upwards; cleaning holes by using an air pump, blowing out dust, adopting a three-blowing three-brushing process, washing by using water and drying. The implanted steel bars are arranged in a quincuncial shape with the horizontal distance of 60cm and the vertical distance of 30 cm. As shown in fig. 1.
(5) Pier body and bearing platform planting bar
After holes are drilled and cleaned, pouring A-level bar planting glue (modified epoxy resin adhesive or modified vinyl ester adhesive), slowly pouring the bar planting glue from the hole bottom by using a glue injection gun, wherein the glue is enough to 2/3 of the pore volume and cannot be filled, inserting anchor bars after the bar planting glue is poured, the anchoring length of the pier body bar planting is not less than 35cm, and the anchoring length of the bearing platform bar planting is not less than 60 cm. The pier body anchors all adopt the diameter 25mmHRB400 deformed steel bar, and the vertical anchor goes into the reinforcing bar (the vertical reinforcing bar of the facing) of cushion cap and is respectively: the rectangular pier adopts 16mmHRB400 thread steel, and the circular pier and the flexible pier adopt 22mmHRB400 thread steel. As shown in fig. 2 and 3.
(6) Binding of steel bars for face protection
The vertical steel bars of the outer covered pier body are connected with the bearing platform and installed in combination with the anchoring bars, the vertical steel bars of the rectangular pier adopt threaded steel bars with the diameter of 16mmHRB400, and the anchoring depth is not less than 60 cm; the horizontal distribution reinforcing steel bar adopts 12mmHRB400 twisted steel, and the concrete requirements of reinforcing steel bar binding are as follows:
the reinforcing steel bar has to be straightened, and the cross section area of the reinforcing steel bar is not reduced due to the surface scars and corrosion after straightening.
And b, after the steel bars are fed according to design and construction technology meeting requirements in a processing plant, the flat car is transported to the site for binding. Before binding the steel bars, a pier body sideline is popped out from the top surface of the bearing platform, sleeve connection is adopted according to the fact that the net protective layer of the steel bars on the outermost layer of the pier body protective surface is not smaller than 5cm, single-side lap welding is adopted for the stirrups, the surfaces of the steel bars are clean, and oil stain corrosion and the like are removed.
And c, the steel bar protection layer adopts cushion blocks, the strength and the compactness of the cushion blocks are not lower than the design strength and the compactness of the concrete, the cushion blocks are staggered and distributed, the cushion blocks cannot traverse the whole cross section of the protection layer, and the number of the cushion blocks is not less than 4 per square meter.
d, applying lead wire quincunx binding with the diameter of 0.7-2.0 mm at the intersection of the steel bars.
(7) Template assembling and reinforcing
a making of a template
Firstly, template material: the bamboo plywood is 1.6cm thick, the vertical edge square wood is 5 multiplied by 10cm, the transverse edge adopts a phi 48 multiplied by 3.5mm steel pipe, and the opposite pulling adopts a 16mm high-strength opposite pulling screw rod matched double nuts.
A reinforcement scheme: the square timbers with the vertical ridges on the outer sides of the bamboo plywood are arranged at intervals of 15cm, the double steel pipes with the transverse ridges on the outer sides of the square timbers are arranged at intervals of 60cm, a 16mm high-strength counter-pulling screw rod and a pier body are fixed by single-side lap welding (the lap length meets the standard requirement, the welding seam is full and is free of rust), and the steel pipes are reinforced by a mountain-shaped clamp at intervals of 60 multiplied by 60 cm. And cutting the counter-pulling screw rod with the redundant length when the concrete pouring is completed and the form removal is finished.
b installation of formworks
Firstly, the bamboo plywood is 2.44 multiplied by 1.22m in size, so that the appearance quality is ensured by reducing the joints of the templates, and the pouring height is 3.66m each time.
Uniformly coating a release agent, covering with a plastic film, and waiting for installation.
And thirdly, installing the template by using an automobile for hoisting. Adjusting the erected template under the cooperation of measuring personnel, adjusting the position and elevation of the template, fixing the template after the adjustment meets the requirements, and performing caulking treatment on the template joint.
And fourthly, when the pier body template is installed, in order to ensure the thickness of the concrete protective layer of the steel bar, a concrete cushion block is used for supporting the cushion between the steel bar and the template, the strength of the cushion block is not less than the designed pier body concrete strength, the cushion block is ensured to be perpendicular to the inner surface of the pier body template, and the phenomenon that the cushion block is separated from the template or the cushion block is obliquely propped against the template is strictly prohibited. The cushion blocks are arranged in a staggered manner and in a quincunx shape, and cannot traverse the whole cross section of the protective layer. The number of the cushion blocks is not less than 4 per square meter.
And fifthly, adjusting the position and the verticality of the template after the template is installed, and reporting a measurement supervision to retest the plane position and the elevation of the template after the adjustment is finished. And measuring coordinates of four corner points of the top cap template by using a total station, and comparing the coordinates with design coordinates to determine whether the position of the template is correct or not.
And sixthly, after the plane position and the elevation of the template are measured accurately, checking the reinforcement condition of the template and the cleanness of the inner surface of the template, if no problem exists, reporting the acceptance of the field supervision project, and informing the stirring station to open the disc after the acceptance of the field supervision project is qualified.
(8) Pouring of concrete
and a, pumping and pouring concrete by using a pump truck.
b, before the concrete is put into a mold, measuring the working performance of the concrete, such as temperature, slump, air content and the like, wherein the slump is controlled to be 180mm, and the control deviation is +/-20 mm.
c, before concrete is poured, accumulated water and sundries in the template are cleaned up, the concrete can be poured after the template is wetted by water, the fastening degree of the template and the positions, the number and the like of the cushion blocks of the protective layer are carefully checked, and a specially-assigned person is appointed to carry out repeated checking so as to improve the quality assurance rate of the thickness dimension of the concrete protective layer of the reinforcing steel bar.
d, vibrating the concrete, and preparing 2 plug-in vibrators at least by a construction worker. And before the concrete is newly poured into the construction joint, the construction joint is fully wetted by water, so that the connection quality is ensured.
(9) Form removal
The strength of the concrete when the form is removed is in accordance with the design requirement. When the design does not require it, the following specifications should be met:
the form removing time of the concrete needs to consider the concrete strength during form removing, and also needs to consider that the concrete temperature (caused by cement hydration heat) during form removing cannot be too high so as to avoid cracking caused by too fast temperature reduction of the concrete when contacting air, and further cannot pour cold water for curing at the moment.
The side mould b can be disassembled when the strength of concrete reaches more than 2.5MPa and the surface and edges are not damaged by disassembling the mould.
And c, the form removal is preferably carried out reversely according to the form erecting sequence, the concrete cannot be damaged, and the form can be detached and lifted after the form is separated from the concrete.
And d, when the form is removed, the form can be removed when the temperature difference between the concrete and the surface layer concrete and the temperature difference between the surface layer concrete and the environment are not more than 15 ℃. It is not suitable to be demolded when strong wind or temperature changes sharply.
In hot and dry seasons, a mold removing process of removing the mold section by section, removing the side cover while removing, watering while removing or spraying the curing agent while removing is adopted.
(10) Curing of concrete
And natural curing is adopted in the curing field of the concrete. During concrete curing, the humidity and temperature control of the reinforced concrete should be emphasized.
and a, after the concrete is vibrated, timely maintaining the concrete by adopting a moisture-preserving measure. When the newly cast concrete has an exposed surface, the exposed surface is firstly leveled, then the exposed surface is covered by linen, and measures such as spraying and sprinkling water are timely adopted to carry out moisture preservation and maintenance on the concrete for more than 7 days. When the concrete is maintained in a mode of maintaining with a mold, the concrete at the joint of the template is ensured not to be dehydrated and dried.
b, after the concrete is demoulded in winter and hot seasons, if the weather changes suddenly, appropriate heat preservation (cold season) and heat insulation (summer) measures are adopted to prevent the surface temperature of the concrete from changing violently due to the influence of environmental factors (such as solarization, temperature sudden drop and the like), and the temperature difference between the core part and the surface layer of the concrete and between the surface layer and the environment during maintenance is ensured not to exceed 15 ℃ until the strength of the concrete reaches the design requirement.
And c, during concrete curing, monitoring the temperature of a representative structure, measuring parameters such as the temperature of the core part of the concrete, the temperature of the surface layer of the concrete, the ambient temperature, the relative humidity and the wind speed at regular time, adjusting a curing system in time according to the change conditions of the temperature and the ambient parameters of the concrete, and strictly controlling the internal and external temperature difference of the concrete to meet the requirements.
The Kyoto railway Changping to humping section electrochemical transformation engineering JTDHGZ-SG1 standard section cattle river bridge adopts a wood template scheme to reinforce the pier, and construction is completed in 2019 in 8 months, 20 days to 10 months, 29 days. The template strength is met in the construction process, the template is flexible to disassemble, convenient to carry and high in construction safety, and the template is well commented by owners, certain construction experience is accumulated, and certain social benefits are obtained.

Claims (5)

1. A pier body reinforcing construction method is characterized by comprising the following steps:
(1) excavating a foundation, namely excavating soil on the outer side of the pier body, wherein the excavating width is 1m of the outer side of the pier body;
(2) erecting a scaffold;
(3) chiseling the pier body, namely cleaning up impurities such as soil, concrete laitance and the like on the surface of the pier body, and mechanically chiseling the surfaces of the pier body and a bearing platform by adopting a light electric hammer tool, wherein the chiseling standard is that existing concrete coarse aggregate is exposed, and the aggregate is uniformly distributed;
(4) pier shaft, cushion cap drilling carry out accurate laying-out according to the design drawing on pier shaft, cushion cap, and drilling depth pier shaft is not less than 35cm, and the cushion cap is not less than 60cm, and the diameter of pier shaft drilling is 25mm, and the diameter of cushion cap drilling is respectively: the rectangular pier is 20mm, and the circular pier and the flexible pier are 27 mm; the drilling is perpendicular with pier shaft, cushion cap surface, and the straightness deviation allowed that hangs down: the pier body is less than or equal to 3 percent; the bearing platform is less than or equal to 5 percent, and the horizontal drilling hole cannot be inclined upwards;
(5) planting ribs on a pier body and a bearing platform, wherein the implanted ribs are arranged in a quincunx shape with the horizontal spacing of 60cm and the vertical spacing of 30cm, after holes are drilled and cleaned, A-grade steel bar planting glue is poured, anchor bars are inserted after the steel bar planting glue is poured, the anchoring length of the pier body steel bar planting is not less than 35cm, and the anchoring length of the bearing platform steel bar planting is not less than 60 cm; pier shaft anchor all adopts diameter 25mmHRB400 screw-thread steel, and the reinforcing bar that vertical anchor goes into the cushion cap is the vertical reinforcing bar of armor respectively: the rectangular pier adopts 16mmHRB400 deformed steel bar, and the circular pier and the flexible pier adopt 22mmHRB400 deformed steel bar;
(6) binding protective face reinforcing steel bars, connecting outer-coated pier body vertical reinforcing steel bars with a bearing platform and combining the outer-coated pier body vertical reinforcing steel bars with anchoring ribs, wherein the rectangular pier vertical reinforcing steel bars are threaded reinforcing steel bars with the diameter of 16mmHRB400, and the anchoring depth is not less than 60 cm; the horizontally distributed reinforcing steel bars adopt threaded reinforcing steel bars with the diameter of 12mmHRB 400;
(7) the template assembling and reinforcing method comprises the following steps:
a. template fabrication
Firstly, template material: the bamboo plywood is 1.6cm thick, 5 multiplied by 10cm vertical edge square wood, 48 multiplied by 3.5mm steel pipe for transverse edge, and double nuts matched with 16mm high-strength opposite-pulling screws for opposite pulling;
secondly, a reinforcing scheme is adopted, the vertical-edge square wood outside the bamboo plywood is arranged at intervals of 15cm, the transverse-edge double steel pipes outside the square wood are arranged at intervals of 60cm, and a 16mm high-strength split-bar rod and the planting single-side lap welding of the pier body are adopted for fixing;
b. formwork installation
Firstly, the height of each pouring is 3.66 m;
uniformly coating a release agent, covering with a plastic film, and waiting for installation;
thirdly, the template is installed by adopting automobile hoisting, the erected template is adjusted under the coordination of measuring personnel, the position and the elevation of the template are adjusted, the template is fixed after the adjustment meets the requirements, and the caulking treatment is carried out on the seam of the template;
fourthly, when the pier shaft template is installed, a concrete cushion block is used for supporting a cushion between the steel bar and the template;
fifthly, adjusting the position and the verticality of the template after the template is installed;
sixthly, after the plane position and the elevation of the template are measured accurately, the reinforcement condition of the template and the cleanness of the inner surface of the template are checked;
(8) pouring concrete; before the concrete is put into a mold, working performances of the concrete, such as temperature, slump, air content and the like, are measured, the slump is controlled to be 180mm, and the control deviation is +/-20 mm;
(9) removing the template;
(10) and (5) curing the concrete.
2. The pier body reinforcing construction method according to claim 1, wherein in the step (3), concrete dust and impurities are cleaned by an air compressor after the chiseling is finished, and adhesive impurities such as soil are washed clean by clean water.
3. The pier body reinforcing construction method according to claim 1, wherein the A-stage bar planting adhesive in the step (5) is a modified epoxy resin adhesive or a modified vinyl ester adhesive.
4. The pier body reinforcing construction method according to claim 1, wherein in the step (7) b, the strength of the concrete cushion block is not less than the designed pier body concrete strength, the cushion block is ensured to be perpendicular to the inner surface of the pier body template, and the phenomenon that the cushion block is separated from the template or obliquely propped against the template is strictly prohibited; the cushion blocks are arranged in a staggered manner and are arranged in a quincunx manner, and the cushion blocks cannot traverse the whole cross section of the protective layer; the number of the cushion blocks is not less than 4 per square meter.
5. The pier body reinforcing construction method according to claim 1, wherein the form removal of the concrete in the step (9) is performed when the strength of the concrete of the side form reaches more than 2.5MPa, and the surface and the edges of the side form are not damaged by the form removal; the form removal is carried out reversely according to the order of the vertical form without damaging the concrete, and the form is detached and lifted after being separated from the concrete; when the form is removed, the temperature difference between the concrete and the surface layer concrete and the temperature difference between the surface layer concrete and the environment are not more than 15 ℃; in hot and dry seasons, the mold removal process of removing the mold section by section, removing the side cover while removing, watering while removing or spraying the curing agent while removing is adopted.
CN202010454018.4A 2020-05-26 2020-05-26 Pier body reinforcing construction method Pending CN111648256A (en)

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Application publication date: 20200911