CN111593676A - Construction method of thin-wall hollow pier - Google Patents
Construction method of thin-wall hollow pier Download PDFInfo
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- CN111593676A CN111593676A CN202010575365.2A CN202010575365A CN111593676A CN 111593676 A CN111593676 A CN 111593676A CN 202010575365 A CN202010575365 A CN 202010575365A CN 111593676 A CN111593676 A CN 111593676A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a thin-wall hollow pier construction method which comprises the steps of basic section construction, turnover formwork installation, reinforcing steel bar processing and installation, concrete pouring, platform lifting, formwork turnover, pier top solid section and tray and top cap construction and turnover formwork dismantling. The construction method of the thin-wall hollow pier is simple and convenient to construct, and labor and time are saved.
Description
Technical Field
The invention relates to the technical field of construction, in particular to a construction method of a thin-wall hollow pier.
Background
Compared with a solid pier, the hollow pier has the advantages that the interior of the pier body is a cavity, the concrete consumption is effectively reduced, reinforcing bars are reduced, the dead weight of the pier body is greatly reduced, and the bearing capacity of the pier can still be effectively guaranteed. The hollow thin-wall pier is suitable for a pier with a higher pier height, and has better stability when being used for the high pier because the torsional moment of inertia of the hollow thin-wall pier is larger.
The pier top of hollow thin-wall pier is solid construction and pier shaft height is higher, therefore when building construction platform and template support frame on pier shaft upper portion, the actual construction degree of difficulty is great to there is certain construction risk, in addition, the engineering volume is big, takes a lot of work and time, influences construction period.
Disclosure of Invention
The invention aims to provide a construction method of a thin-wall hollow pier, which is simple and convenient to construct and saves labor and time.
In order to achieve the purpose, the invention provides a thin-wall hollow pier construction method which comprises the steps of basic section construction, turnover formwork installation, steel bar processing and installation, concrete pouring, platform lifting, formwork turnover, pier top solid section and tray, top cap construction and turnover formwork removal.
Preferably, the construction steps of the basic section are as follows, the basic section is the lower solid section, when the lower solid section is constructed, the size of the outer die is correct, the top of the outer die is horizontal, otherwise, when the hollow section is constructed, the template is uneven.
Preferably, the rollover mounting steps are as follows:
(1) manufacturing operation platform
A rectangular operating platform is welded by utilizing L50 x 50 angle steel, the height is 3.6m, the operating platform is divided into two layers, the outer side of the operating platform is sealed by steel wires, the safety of workers is ensured, and the inner side of the operating platform is transversely connected with three pipes with the diameter of 48, so that the rigidity and the stability of the operating platform are improved;
(2) platform hoisting and positioning
The tower crane is used for integral hoisting, when in hoisting, the center of the platform is required to be superposed with the center of the pier, and the error is not more than 1 cm;
(3) assembling turnover mould
The inner and outer templates are respectively provided with three layers, and the turnover templates are assembled in sequence and at different positions; when assembling, the gap between the templates needs to be tight, the inner and outer templates are corrected according to the designed size, and the lacing wires and the support wood are arranged.
Preferably, the steel bar processing and mounting steps are as follows:
straightening local bent steel bars before processing the steel bars, blanking the steel bars, performing a first processing test on the same batch of steel bars with the same size according to design requirements and specification, and processing the steel bars in batches after the steel bars are qualified; the joints are mechanically connected and are configured in a compression steel bar joint in the same section, and the section of the compression steel bar joint cannot exceed 50% of the number of the main bars; and after the self-inspection is qualified, a supervision engineer is reported for inspection.
Preferably, the concrete pouring step is as follows:
after the concrete is mixed according to the mixing ratio in a mixing station, the concrete is transported by a tower crane by a large hopper and is conveyed to a pouring section to be manually conveyed into a template; the concrete is symmetrically discharged, four discharging platforms are arranged on the platform according to four equal parts and are symmetrically distributed, so that the balance of the platforms is ensured;
uniformly and symmetrically pouring the materials in layers, wherein the thickness of the materials is 30 cm; the vibrator is not suitable to be inserted too deeply and not to be crushed and hit the template; when the concrete is poured to the top of the formwork, the concrete is 1-2 cm lower than the opening of the formwork, so that the next formwork is conveniently assembled and turned, and the slab staggering is prevented; and when the strength of the concrete is more than 3MPa, removing floating slurry, roughening the surface of the concrete, and performing second and third segment construction.
Preferably, the platform lifting process is as follows:
after the formwork overturning assembly, the first lifting platform is carried out after concrete is poured to reach a certain height, the time is that the lifting height is limited by 1-2 strokes of the jack after the initial setting of the concrete and before the final setting of the concrete;
lifting every hour for the second time and every later, wherein when the surface of the concrete is hard, the concrete is lifted every half hour, and when the surface of the concrete is whitish, the concrete is lifted for 1-2 strokes;
after the concrete is finally set, lifting every 4-6 hours; after the template is assembled, the template is lifted once before concrete is poured to check whether the sleeve is stuck or not, and the sleeve is wiped clean and oiled before the next concrete slab is poured;
the total height of the platform is increased so as to meet the requirement of the assembly height of a section of template, and meanwhile, the platform is controlled to reach the design height after final setting, so that the excessive height of the platform is avoided;
and (4) collecting slopes after the platform is lifted to half of the total stroke, finishing before final setting, and carrying out inspection by a special person after the platform is in place.
Preferably, the template overturning step is as follows:
when the strength of the first section of concrete and the second section of concrete reaches 10MPa, the section of template is dismantled, and the section of template is turned to a fourth section of concrete by using an internal and external fixed frame, a tower crane and a hand-operated block, and the first section of concrete and the second section of concrete are circulated upwards;
and (3) disassembling the template: the template can be divided into a plurality of large blocks to be turned and lifted integrally according to the condition, and the work is performed in advance in the process of pouring the concrete of the template at the uppermost layer; before disassembly, the template is hung by a hook, and then the lacing wires and the surrounding belts are removed;
turning over and lifting the template: after the platform is lifted in place, the lowest formwork is lifted to the mounting position by a chain block, and a specially-assigned person checks the lifting process to prevent the formwork from being hung and collided with a fixed object;
checking the assembling quality of the template, and meeting the design requirement of the pier; and after the inspection is qualified, wood support is placed, and the lacing wire is screwed.
Preferably, the construction method of the pier top solid section, the tray and the top cap comprises the following steps:
when the solid section of the pier top is constructed, firstly removing the inner die and the inner hanger, then installing the lintel and the bottom die of the solid section, and then installing the outer die of the solid section;
when the pier cap is constructed, the tray and the top cap are constructed twice; and after the platform is lifted to the height of the installed template each time, installing a tray or a top cap template, binding steel bars and pouring concrete.
Preferably, the rollover dismounting method comprises the following steps:
dismantling is carried out according to the reverse order of assembly, the template is firstly dismantled, and then the platform is dismantled;
when the platform is dismantled, a scaffold platform is arranged on the pier top by using a short steel pipe in a striking mode, the hydraulic platform is stably placed on the scaffold platform, bolts of the sleeve and the platform are loosened, the jack is inversely sleeved on the ejector rod and reversely climbs, and the ejector rod is sequentially pulled out; and after the operation is finished, all equipment on the platform is dismantled, the bolts of the sleeve and the platform are all loosened, the sleeve and the platform are integrally hoisted by using a tower crane, and finally the sleeve filling hole is pulled out.
Therefore, the construction method of the thin-wall hollow pier is simple and convenient to construct, and labor and time are saved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a flow chart of a construction process of a thin-wall hollow pier in a rollover method of the thin-wall hollow pier construction method.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a flow chart of a construction process of a thin-wall hollow pier turning mold method in the thin-wall hollow pier construction method, and as shown in the figure, the thin-wall hollow pier construction method comprises the steps of basic section construction, turning mold installation, steel bar processing and installation, concrete pouring, a lifting platform, template turning and lifting, pier top solid section and tray, top cap construction and turning mold dismantling, and the specific contents are as follows:
1) construction of basic section
And constructing a basic section, namely a lower solid section. When the lower solid section is constructed, the support of the external mold is directly related to the subsequent construction, the required size is correct, the top of the external mold is horizontal, otherwise, the template is uneven when the hollow section is constructed.
2) Rollover installation
Making operation platform
A rectangular operating platform is welded by utilizing L50 x 50 angle steel, the height is 3.6m, the operating platform is divided into two layers, the outer side of the operating platform is sealed by steel wires, the safety of workers is ensured, and the inner side of the operating platform is transversely connected with three pipes with the diameter of 48, so that the rigidity and the stability of the operating platform are improved;
lifting and positioning platform
The tower crane is used for integral hoisting, when in hoisting, the center of the platform is required to be superposed with the center of the pier, and the error is not more than 1 cm;
thirdly, assembling and overturning the mold
The inner and outer templates are respectively provided with three layers, and the turnover templates are assembled in sequence and at different positions; when assembling, the gap between the templates needs to be tight, the inner and outer templates are corrected according to the designed size, and the lacing wires and the support wood are arranged.
3) Reinforcing bar processing and installation
The method comprises the steps of straightening local bent steel bars before processing the steel bars, carrying out a first processing test on the same batch of steel bars with the same size according to design requirements and specification regulations strictly by steel bar blanking, and processing the steel bars in batches after the steel bars are qualified. When the steel bar is processed, the steel bar is processed according to the number, the diameter, the grade, the length and the quantity of the steel bars in the drawing, the steel bars are matched in length, and joints are reduced. The joints are mechanically connected and are configured in the same cross section of the compression steel bar joint, and the cross section of the compression steel bar joint does not exceed 50% of the number of the main bars.
The thin-wall hollow pier steel bar processing must meet the requirements of specification and design. And after the self-inspection is qualified, a supervision engineer is reported for inspection.
4) Pouring concrete
After the concrete is mixed according to the mixing ratio in a mixing station, the concrete is transported by a tower crane by a large hopper, discharged on a platform and manually conveyed into a template. The concrete is symmetrically discharged, four discharging platforms are arranged on the platforms according to four equal parts and are symmetrically distributed, and the balance of the platforms is ensured.
Uniformly and symmetrically pouring the materials in layers, wherein the thickness of the materials is 30 cm; the vibrator is not suitable to be inserted too deeply and not to be crushed and hit the template; when the concrete is poured to the top of the formwork, the concrete is lower than the opening of the formwork by 1-2 cm, the formwork is turned over for the next slab to be assembled conveniently, and slab staggering is prevented. And when the strength of the concrete is more than 3MPa, removing floating slurry, roughening the surface of the concrete, and performing second and third segment construction.
And (3) observing the positions of the embedded parts and the supporting conditions of the templates, the supports and the like at any time by using a measuring instrument in the pouring process, and immediately correcting and reinforcing the embedded parts if deformation and subsidence exist.
5) Lifting platform
After the formwork overturning assembly, the first lifting of the platform is carried out after the concrete is poured to reach a certain height (generally not less than 0.8m), the time is preferably after the initial setting of the concrete and before the final setting, and the lifting height is limited by 1-2 strokes (one stroke is 3cm) of the jack.
And lifting for the second time and later (before final setting) once per hour, lifting for every half hour when the surface of the concrete is hard, and lifting for 1-2 strokes when the surface of the concrete is white.
After the concrete is finally set, lifting every 4-6 hours; after the template is assembled, the template is lifted once before concrete is poured to check whether the sleeve is stuck or not, and the sleeve is wiped clean and oiled before the next concrete slab is poured.
The total height of the platform is increased so as to meet the requirement of the assembly height of a section of template (more than 1.5m and less than 1.8m), and meanwhile, the platform is controlled to reach the design height after final setting, so that the excessive height of the platform is avoided.
And (4) rectifying and leveling at any time in the lifting process of the platform.
And (4) collecting slopes after the platform is lifted to half of the total stroke, finishing before final setting, and carrying out inspection by a special person after the platform is in place.
And (4) selecting workers with strong responsibility and high quality by lifting operators of the platform, and training the workers to go on duty after training.
6) Turning over and lifting form
When the strength of the first section of concrete and the second section of concrete reaches 10MPa, the section of template is dismantled, and the section of template is turned to the fourth section of concrete by using the internal and external fixed frames, the tower crane and the hand hoist, and the concrete is circulated upwards according to the above steps.
And (3) disassembling the template: the formwork can be divided into a plurality of large blocks to be integrally turned and lifted according to the condition, and the work is performed in advance in the process of pouring the concrete of the uppermost formwork. Before disassembly, the template is hung by the hook, and then the lacing wires, the surrounding belts and the like are removed.
Turning over and lifting the template: and after the platform is lifted to the proper position, the lowest layer of template is lifted to the installation position by a chain block. In the lifting process (including lifting of the platform), a specially-assigned person checks to prevent the template from being hung and collided with a fixed object.
And (5) checking the assembling quality of the template, and meeting the design requirement of the pier. And after the inspection is qualified, wood support is placed, and the lacing wire is screwed.
7) Construction of pier top solid section, tray and top cap
When the pier top solid section is constructed, the inner mold and the inner hanger are firstly removed, then the lintel (the lintel adopts I-steel and is horizontally placed on the topmost section of the hollow section in parallel and at equal intervals) and the bottom mold of the solid section are installed, and then the outer mold of the solid section is installed.
When the pier cap is constructed, the tray and the top cap are constructed twice; and after the platform is lifted to the height of the installed template each time, installing a tray or a top cap template, binding steel bars and pouring concrete.
8) Demolishing of the rollover
The disassembly is performed in the reverse order of assembly. The formwork is firstly dismantled, and then the platform is dismantled.
When the platform is dismantled, a scaffold platform is arranged on the pier top by using a short steel pipe in a beating mode, the hydraulic platform is stably placed on the scaffold platform, bolts of the sleeve and the platform are loosened (do not need to be disassembled), the jack is inversely sleeved on the ejector rod and reversely climbs, and the ejector rod is sequentially pulled out; and after the operation is finished, all equipment on the platform is dismantled, the bolts of the sleeve and the platform are all loosened, the sleeve and the platform are integrally hoisted by using a tower crane, and finally the sleeve filling hole is pulled out.
Therefore, the construction method of the thin-wall hollow pier is simple and convenient to construct, and labor and time are saved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. A construction method of a thin-wall hollow pier is characterized by comprising the following steps: the method comprises the steps of basic section construction, turnover formwork installation, steel bar processing and installation, concrete pouring, platform lifting, formwork turnover, pier top solid section and tray, top cap construction and turnover formwork dismantling.
2. The thin-wall hollow pier construction method according to claim 1, wherein: the basic section construction steps are as follows, the basic section, namely the lower solid section is constructed, when the lower solid section is constructed, the size of the outer die is correct, the top of the outer die is horizontal, otherwise, when the hollow section is constructed, the template is uneven.
3. The construction method of the thin-wall hollow pier as claimed in claim 1, wherein the rollover installation steps are as follows:
(1) manufacturing operation platform
A rectangular operating platform is welded by utilizing L50 x 50 angle steel, the height is 3.6m, the operating platform is divided into two layers, the outer side of the operating platform is sealed by steel wires, the safety of workers is ensured, and the inner side of the operating platform is transversely connected with three pipes with the diameter of 48, so that the rigidity and the stability of the operating platform are improved;
(2) platform hoisting and positioning
The tower crane is used for integral hoisting, when in hoisting, the center of the platform is required to be superposed with the center of the pier, and the error is not more than 1 cm;
(3) assembling turnover mould
The inner and outer templates are respectively provided with three layers, and the turnover templates are assembled in sequence and at different positions; when assembling, the gap between the templates needs to be tight, the inner and outer templates are corrected according to the designed size, and the lacing wires and the support wood are arranged.
4. The construction method of the thin-wall hollow pier as claimed in claim 1, wherein the steps of processing and installing the steel bars are as follows:
straightening local bent steel bars before processing the steel bars, blanking the steel bars, performing a first processing test on the same batch of steel bars with the same size according to design requirements and specification, and processing the steel bars in batches after the steel bars are qualified; the joints are mechanically connected and are configured in a compression steel bar joint in the same section, and the section of the compression steel bar joint cannot exceed 50% of the number of the main bars; and after the self-inspection is qualified, a supervision engineer is reported for inspection.
5. The method for constructing the thin-wall hollow pier according to claim 1, wherein the concrete pouring step comprises the following steps:
after the concrete is mixed according to the mixing ratio in a mixing station, the concrete is transported by a tower crane by a large hopper and is conveyed to a pouring section to be manually conveyed into a template; the concrete is symmetrically discharged, four discharging platforms are arranged on the platform according to four equal parts and are symmetrically distributed, so that the balance of the platforms is ensured;
uniformly and symmetrically pouring the materials in layers, wherein the thickness of the materials is 30 cm; the vibrator is not suitable to be inserted too deeply and not to be crushed and hit the template; when the concrete is poured to the top of the formwork, the concrete is 1-2 cm lower than the opening of the formwork, so that the next formwork is conveniently assembled and turned, and the slab staggering is prevented; and when the strength of the concrete is more than 3MPa, removing floating slurry, roughening the surface of the concrete, and performing second and third segment construction.
6. The construction method of the thin-wall hollow pier as claimed in claim 1, wherein the platform lifting process comprises the following steps:
after the formwork overturning assembly, the first lifting platform is carried out after concrete is poured to reach a certain height, the time is that the lifting height is limited by 1-2 strokes of the jack after the initial setting of the concrete and before the final setting of the concrete;
lifting every hour for the second time and every later, wherein when the surface of the concrete is hard, the concrete is lifted every half hour, and when the surface of the concrete is whitish, the concrete is lifted for 1-2 strokes;
after the concrete is finally set, lifting every 4-6 hours; after the template is assembled, the template is lifted once before concrete is poured to check whether the sleeve is stuck or not, and the sleeve is wiped clean and oiled before the next concrete slab is poured;
the total height of the platform is increased so as to meet the requirement of the assembly height of a section of template, and meanwhile, the platform is controlled to reach the design height after final setting, so that the excessive height of the platform is avoided;
and (4) collecting slopes after the platform is lifted to half of the total stroke, finishing before final setting, and carrying out inspection by a special person after the platform is in place.
7. The construction method of the thin-wall hollow pier as claimed in claim 1, wherein the template turning and lifting steps are as follows:
when the strength of the first section of concrete and the second section of concrete reaches 10MPa, the section of template is dismantled, and the section of template is turned to a fourth section of concrete by using an internal and external fixed frame, a tower crane and a hand-operated block, and the first section of concrete and the second section of concrete are circulated upwards;
and (3) disassembling the template: the template can be divided into a plurality of large blocks to be turned and lifted integrally according to the condition, and the work is performed in advance in the process of pouring the concrete of the template at the uppermost layer; before disassembly, the template is hung by a hook, and then the lacing wires and the surrounding belts are removed;
turning over and lifting the template: after the platform is lifted in place, the lowest formwork is lifted to the mounting position by a chain block, and a specially-assigned person checks the lifting process to prevent the formwork from being hung and collided with a fixed object;
checking the assembling quality of the template, and meeting the design requirement of the pier; and after the inspection is qualified, wood support is placed, and the lacing wire is screwed.
8. The construction method of the thin-wall hollow pier as claimed in claim 1, wherein the construction method of the pier top solid section, the tray and the top cap comprises the following steps:
when the solid section of the pier top is constructed, firstly removing the inner die and the inner hanger, then installing the lintel and the bottom die of the solid section, and then installing the outer die of the solid section;
when the pier cap is constructed, the tray and the top cap are constructed twice; and after the platform is lifted to the height of the installed template each time, installing a tray or a top cap template, binding steel bars and pouring concrete.
9. The construction method of the thin-wall hollow pier as claimed in claim 1, wherein the rollover dismantling method comprises the following steps:
dismantling is carried out according to the reverse order of assembly, the template is firstly dismantled, and then the platform is dismantled;
when the platform is dismantled, a scaffold platform is arranged on the pier top by using a short steel pipe in a striking mode, the hydraulic platform is stably placed on the scaffold platform, bolts of the sleeve and the platform are loosened, the jack is inversely sleeved on the ejector rod and reversely climbs, and the ejector rod is sequentially pulled out; and after the operation is finished, all equipment on the platform is dismantled, the bolts of the sleeve and the platform are all loosened, the sleeve and the platform are integrally hoisted by using a tower crane, and finally the sleeve filling hole is pulled out.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232480A (en) * | 2021-10-30 | 2022-03-25 | 山东高速工程建设集团有限公司 | High hollow pier group formwork turnover rapid construction method for viaduct bridge |
| CN114658209A (en) * | 2022-05-05 | 2022-06-24 | 山西四建集团有限公司 | Concrete structure outer wall arc shaping template and construction method thereof |
| CN114892528A (en) * | 2022-05-23 | 2022-08-12 | 云南交投集团云岭建设有限公司 | Double-layer formwork construction method for uniform-section thin-wall hollow pier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232480A (en) * | 2021-10-30 | 2022-03-25 | 山东高速工程建设集团有限公司 | High hollow pier group formwork turnover rapid construction method for viaduct bridge |
| CN114232480B (en) * | 2021-10-30 | 2024-05-03 | 山东高速工程建设集团有限公司 | Quick construction method for turning over mould of bridge group of viaduct Gao Kongxin |
| CN114658209A (en) * | 2022-05-05 | 2022-06-24 | 山西四建集团有限公司 | Concrete structure outer wall arc shaping template and construction method thereof |
| CN114892528A (en) * | 2022-05-23 | 2022-08-12 | 云南交投集团云岭建设有限公司 | Double-layer formwork construction method for uniform-section thin-wall hollow pier |
| CN114892528B (en) * | 2022-05-23 | 2024-03-05 | 云南交投集团云岭建设有限公司 | Construction method of double-layer template of uniform-section thin-wall hollow pier |
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