CN108978483B - Combined prepressing method for concrete box girder steel pipe support of hybrid beam cable-stayed bridge - Google Patents
Combined prepressing method for concrete box girder steel pipe support of hybrid beam cable-stayed bridge Download PDFInfo
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- CN108978483B CN108978483B CN201810969331.4A CN201810969331A CN108978483B CN 108978483 B CN108978483 B CN 108978483B CN 201810969331 A CN201810969331 A CN 201810969331A CN 108978483 B CN108978483 B CN 108978483B
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention provides a combined prepressing method of a concrete box girder steel pipe bracket of a mixed beam cable-stayed bridge, which comprises the steps of piling concrete blocks along the box girder on a bracket template, piling steel strands along a longitudinal web plate, and paving canvas for water injection in an area enclosed by a transverse clapboard and the longitudinal web plate; the support is pre-pressed in a grading mode through the materials, deformation of the support under each grade of pre-pressing is observed, and the elevation of the support is adjusted to the elevation value of the vertical mold according to the elastic and inelastic deformation values of the support.
Description
Technical Field
The invention belongs to the field of bridge engineering construction, and relates to a prepressing method applied to a concrete box girder steel pipe bracket of a main bridge of a hybrid beam cable-stayed bridge.
Background
When the hybrid beam cable-stayed bridge is constructed, the bailey bracket and the driven steel pipe pile are often used as bearing piles, the bracket may be settled in the concrete pouring process, and the overall stress of the bracket is influenced. In order to avoid the phenomenon of uneven settlement in the pouring process, the support needs to be pre-pressed before construction, so that the inelastic and elastic deformation of the support under the action of load can be accurately known, the strength, the rigidity and the stability of the support are checked, the adjustment value of the elevation of the bottom of the template is determined, and the actual line shape and the theoretical line shape of the bridge after the bridge is built are ensured to be consistent as much as possible.
The pre-pressing of the prior steel pipe bracket usually adopts a mode of piling and loading a sand bag and a water bag on the bracket, and has the following defects:
1. the prepressing efficiency is low, sand bags or water bags are adopted for prepressing, and the prepressing process needs at least 7-10 d;
2. the adopted sandbag prepressing has the advantages of large engineering quantity, time and labor consumption for loading, unloading and carrying, high labor intensity, high labor cost, high mechanical cost and sand bag purchasing cost, high sand loss and high overall cost;
3. observation points are not convenient to arrange by adopting sand bag prepressing, and the condition of the whole support settlement is not easy to reflect;
4. the sand bag is influenced by rainfall and the like, the weight change is large, and a certain error is caused to the prepressing precision;
5. the water bag prepressing has strict requirements on the stacking load, and two water bags cannot be used in a superposed mode, because the water bag at the bottom layer is likely to burst under the pressure of the upper layer, the 'water egg' explosion is caused, and the water bag belongs to a major hazard source;
6. the sand bag or water bag prepressing can not accurately adjust the prepressing counter weight, and the precision of test data can be influenced.
Disclosure of Invention
The invention aims to improve the traditional prepressing process aiming at the problem that the traditional sand bag and water bag prepressing method can not meet the high standard requirement of the concrete box girder steel tube support of the hybrid beam cable-stayed bridge, and provides a safe, convenient, quick, economic and efficient prepressing construction process of the concrete box girder steel tube support of the main bridge of the hybrid beam cable-stayed bridge.
The technical scheme of the invention is as follows:
a combined prepressing method of a concrete box girder steel pipe support of a hybrid beam cable-stayed bridge is characterized by comprising the following steps:
(1) setting an observation point: on the top surface of the support, respectively arranging an observation point below each design position of each longitudinal web of the concrete box girder to be poured in the transverse bridge direction, wherein one observation point is arranged in the longitudinal bridge direction at intervals of not more than 5 m; after the template on the support is laid, removing all temporary loads on the template, and measuring the elevation of the support before prepressing through each observation point under the condition of no load;
(2) pre-loading treatment:
(21) cleaning sundries on the surface of the template, and performing waterproof treatment on the joints among the templates to ensure that the template is watertight;
(22) measuring and discharging the center lines of the diaphragm plates and the longitudinal webs of the concrete box girder sections to be poured on the template; dividing a concrete block stacking area along a transverse partition plate, dividing a steel strand stacking area along a longitudinal web plate, and taking an area enclosed by the transverse partition plate and the longitudinal web plate as a water injection area;
(3) loading: the loading is divided into 5 grades, and the pressure tests are carried out in a grading way according to 25%, 50%, 75%, 100% and 110%; the loading mode is stacking concrete blocks, steel strands and water injection, and the specific mode is as follows;
(31) according to the central line of the transverse partition plate and the central line of the longitudinal web plate which are measured and released, stacking concrete blocks along the transverse partition plate, and simultaneously stacking steel strands along the longitudinal web plate;
(32) canvas is laid in the water injection areas, each water injection area is laid by adopting the whole piece of seamless canvas, and the canvas is checked to ensure that the canvas has no water leakage defect; when the concrete block and the steel strand are stacked to a certain height, the periphery of the canvas is lapped on the top of the stacked concrete block and the top of the steel strand and is compressed, and water is synchronously injected into each water injection area;
(33) performing circulating construction according to the steps (31) and (32) until the maximum design load is loaded;
(4) and (3) observing the elevation of the support: observing the elevation of the support through an observation point every time a loading level is reached in the loading process, and recording observation data; after the load of each stage of the front 4 stages is added, carrying out bracket deformation observation after 30 minutes; observing once every 24 hours after the highest loading level load is reached, and when the average sedimentation amount difference value of each observation point is less than 1mm or the average sedimentation amount value of the measurement points for three times is less than 5mm, meeting the unloading condition and starting unloading;
(5) unloading: the unloading process and the loading process are in reverse order, and the unloading is carried out in stages, so that observation records are also carried out when each loading level is reached, and the observation records are compared with the loading records;
(6) and analyzing specific values of the elastic deformation and the inelastic deformation of the support according to the loading and unloading records, and adjusting the elevation of the support to the elevation value of the vertical mold.
The invention adopts various materials such as concrete blocks, steel strands, water storage and the like as counter weights for combined prepressing, and compared with the traditional sand bag or water bag prepressing method, the invention has the following advantages:
1. the water injection process can be controlled at will, so that the precision and the range of the counterweight of the invention can be adjusted, and the prepressing precision is improved;
2. the construction is convenient and fast, the material storage, transportation and hoisting are safe and simple, the prepressing speed is fast, the construction period can be effectively saved, and the prepressing only needs 2 d-3 d generally.
3. By utilizing the method, more observation points can be arranged, and repeated pressurization and measurement can be carried out on which data is in question;
4. the method has the advantages of high material turnover rate, simple method, 60 percent reduction of the whole cost compared with the sand bag prepressing and 50 percent reduction compared with the water bag prepressing, and has good economic effect.
Drawings
FIG. 1 is a schematic view of a transverse bridging arrangement of observation points;
FIG. 2 is a schematic view of the arrangement of observation points along the bridge;
FIG. 3 is a partial schematic view of a concrete block loading area, a steel strand loading area and a water injection area which are divided on a support formwork according to the present invention;
FIG. 4 is a partial cross-sectional view of the present invention with the load on the stack along the diaphragm;
FIG. 5 is a partial cross-sectional view of the water injection loading of the present invention along a transverse bridge.
Detailed Description
The following describes the implementation of the present invention with reference to the embodiments and the drawings.
The side span cast-in-place section of a hybrid beam cable-stayed bridge constructed by the applicant is long, the width of a main beam is large, the section of a single box is large, the length of cantilevers at two ends is long, the cast-in-place section is heavy, the construction difficulty is high, and the requirement on a steel pipe support is high, so the steel pipe support prepressing process is adopted for verification.
The side span cast-in-place section does not pre-press the wing plates and the inclined web plates. The pre-pressing load test material adopts the combined action of the concrete block, the steel strand and the water storage to simulate the working condition of concrete pouring for loading. The large concrete blocks for loading are calculated according to 2.4 t/block, the small concrete blocks are calculated according to 1 t/block, the average weight of the steel strand is 3.8 t/bundle, the diameter of the steel strand is 1.3m, and the height of the steel strand is 0.75 m.
A crane is used as hoisting equipment, the transverse partition plates and the longitudinal web plates are pre-pressed by piling prefabricated concrete blocks, a whole canvas is laid between the concrete blocks, and clear water is injected to serve as top and bottom plate pre-pressing balance weights.
Because the influence of sunshine temperature to steel construction deformation, for accurate survey support deformation value, select as far as possible in the morning 5: 30-7: 30 and 5 at night: 30-7: 00 the time period with smaller temperature difference is used for deformation observation.
Taking the support prepressing of the cast-in-place beam section of the 0# block of the bridge as an example, the concrete prepressing process is as follows:
(1) setting an observation point: as shown in fig. 1 and 2, on the top surface of a bracket 1, observation points 4 are respectively arranged below the design position of each longitudinal web 3 of a concrete box girder 2 to be poured in the transverse bridge direction, and one observation point longitudinal bridge direction is arranged at intervals of not more than 5 m; in this embodiment, there are 4 observation points set in the transverse direction, and 8 observation points set under each longitudinal web in the longitudinal direction, for 32. After the upper formwork 5 of the support is paved, all temporary loads on the formwork 5 are removed, and under the condition of no load, the elevation of the support 1 before prepressing is measured through each observation point.
(2) Pre-loading treatment:
(21) cleaning sundries on the surface of the template, and performing waterproof treatment on the joints among the templates to ensure that the template is watertight;
(22) as shown in fig. 3, measuring and releasing the center lines of the diaphragm plates and the longitudinal webs of the concrete box girder to be poured on the template; dividing a concrete block stacking area 6 along a transverse partition plate, dividing a steel stranded wire stacking area 7 along a longitudinal web plate, and defining an area enclosed by the transverse partition plate and the longitudinal web plate as a water injection area 8;
(3) loading: the loading is divided into 5 grades, and the pressure tests are carried out in a grading way according to 25%, 50%, 75%, 100% and 110%; the loading mode is stacking concrete blocks, steel strands and water injection, and the specific mode is as follows;
(31) as shown in fig. 4, according to the central line of the transverse partition plate and the central line of the longitudinal web plate which are measured and released, the concrete block 9 is stacked along the transverse partition plate, and the steel strand 10 is stacked along the longitudinal web plate;
(32) as shown in fig. 5, canvas is laid in the water injection areas, each water injection area is laid by using the whole piece of seamless canvas, and the canvas is checked and ensured not to have water leakage defects; when the concrete block and the steel strand are piled up to a certain height, the periphery of the canvas is lapped on the top of the piled concrete block and the top of the steel strand and is compressed, and water is synchronously injected into each water injection area by 11;
(33) performing circulating construction according to the steps (31) and (32) until the maximum design load is loaded;
(4) and (3) observing the elevation of the support: observing the elevation of the support through an observation point every time a loading level is reached in the loading process, and recording observation data; after the load of each stage of the front 4 stages is added, carrying out bracket deformation observation after 30 minutes; observing once every 24 hours after the highest loading level is reached, and when the average sedimentation amount difference value of each observation point is less than 1mm or the average sedimentation amount value of each measurement point for three consecutive times is less than 5mm, meeting the unloading condition and starting unloading;
(5) unloading: the unloading process and the loading process are in reverse order and are unloaded in a grading way; observing records are also carried out when each loading level is reached, and the observation records are compared with the loading records;
(6) and analyzing specific values of the elastic deformation and the inelastic deformation of the support according to the loading and unloading records, and adjusting the elevation of the support to the elevation value of the vertical mold.
In the process, when the concrete block is stacked, the stacking area of the concrete block is in the range of 0.5m from left to right along the center line of the transverse partition plate, and the concrete block is stacked from the midspan to two sides; the upper and lower layers of concrete blocks are stacked to form a concrete block partition wall and ensure the stability of the partition wall.
In order to ensure that the lateral pressure of water after water injection can not push the partition wall of the concrete block over, several layers of sand bags are piled close to the root of the partition wall of the concrete block to form an inequilateral trapezoid shape to counteract the lateral pressure of water, or battens are used for simply supporting the partition wall of the concrete block.
When the steel strands are stacked, the stacking areas of the steel strands are in the range of 0.5m respectively along the left and right sides of the center line of the longitudinal web plate, and the upper layer and the lower layer are stacked to ensure the stability of a stacking body; according to the arrangement principle that the steel strands are stacked from the middle to the edge and from inside to outside, namely, the steel strands are stacked along the longitudinal webs located in the middle of the box girder and then sequentially stacked towards the longitudinal webs located on the two sides, and when the steel strands are stacked along each longitudinal web, the steel strands are stacked firstly on the inner side, namely, on the side relatively close to the middle of the box girder, and then on the outer side, namely, on the side relatively far away from the middle of the box girder.
During water injection, the highest and lowest water levels of a water injection area have a water head difference under the condition that a bridge deck longitudinal slope exists, and the lowest water level is taken to control the water injection height when the water depth is measured.
The observation of the elevation of the bracket mainly comprises: settling value of each steel pipe pile foundation; down-warping value of each row of steel pipe pile top templates; and the midspan position of the bearing beam is downwarped.
The following table is the observation that the maximum preload was achieved for the 0# block holder in this example:
and according to the support deformation value accurately measured in the pre-pressing process, determining the elastic deformation value and the foundation elastic subsidence value which are generated by the support under the action of the load of the beam section, superposing the elastic deformation value and the foundation subsidence value with other factors proposed in construction control, calculating the pre-camber which is required to be adopted in construction, and adjusting the elevation of the support according to the calculated pre-camber.
And determining and adjusting the elevation of the beam bottom vertical mold according to the actually measured support deformation value and by combining the design elevation. And (3) designing the beam bottom elevation plus the support elastic deformation value.
Claims (5)
1. A combined prepressing method of a concrete box girder steel pipe support of a hybrid beam cable-stayed bridge is characterized by comprising the following steps:
(1) setting an observation point: on the top surface of the support, respectively arranging an observation point below each design position of each longitudinal web of the concrete box girder to be poured in the transverse bridge direction, wherein one observation point is arranged in the longitudinal bridge direction at intervals of not more than 5 m; after the template on the support is laid, removing all temporary loads on the template, and measuring the elevation of the support before prepressing through each observation point under the condition of no load;
(2) pre-loading treatment:
(21) cleaning sundries on the surface of the template, and performing waterproof treatment on the joints among the templates to ensure that the template is watertight;
(22) measuring and discharging the center lines of the diaphragm plates and the longitudinal webs of the concrete box girder sections to be poured on the template; dividing a concrete block stacking area along a transverse partition plate, dividing a steel strand stacking area along a longitudinal web plate, and taking an area enclosed by the transverse partition plate and the longitudinal web plate as a water injection area;
(3) loading: the loading is divided into 5 grades, and the pressure tests are carried out in a grading way according to 25%, 50%, 75%, 100% and 110%; the loading mode is stacking concrete blocks, steel strands and water injection, and the specific mode is as follows;
(31) according to the central line of the transverse partition plate and the central line of the longitudinal web plate which are measured and released, stacking concrete blocks along the transverse partition plate, and simultaneously stacking steel strands along the longitudinal web plate;
(32) canvas is laid in the water injection areas, each water injection area is laid by adopting the whole piece of seamless canvas, and the canvas is checked to ensure that the canvas has no water leakage defect; when the concrete block and the steel strand are stacked to a certain height, the periphery of the canvas is lapped on the top of the stacked concrete block and the top of the steel strand and is compressed, and water is synchronously injected into each water injection area;
(33) performing circulating construction according to the steps (31) and (32) until the maximum design load is loaded;
(4) and (3) observing the elevation of the support: observing the elevation of the support through an observation point every time a loading level is reached in the loading process, and recording observation data; after the load of each stage of the front 4 stages is added, carrying out bracket deformation observation after 30 minutes; observing once every 24 hours after the highest loading level load is reached, and when the average sedimentation amount difference value of each observation point is less than 1mm or the average sedimentation amount value of the measurement points for three times is less than 5mm, meeting the unloading condition and starting unloading;
(5) unloading: the unloading process and the loading process are in reverse order, and the unloading is carried out in stages, so that observation records are also carried out when each loading level is reached, and the observation records are compared with the loading records;
(6) and analyzing specific values of the elastic deformation and the inelastic deformation of the support according to the loading and unloading records, and adjusting the elevation of the support to the elevation value of the vertical mold.
2. The combined prepressing method of the concrete box girder steel pipe support of the hybrid beam cable-stayed bridge according to claim 1, wherein: when the concrete block is piled up, the piling area of the concrete block is in the range of 0.5m from the left to the right along the center line of the transverse clapboard and piles from the midspan to the two sides; the upper and lower layers of concrete blocks are stacked to form a concrete block partition wall and ensure the stability of the partition wall.
3. The combined prepressing method of the concrete box girder steel pipe support of the hybrid beam cable-stayed bridge according to claim 2, characterized in that: in order to ensure that the lateral pressure of water after water injection can not push the partition wall of the concrete block over, several layers of sand bags are piled close to the root of the partition wall of the concrete block to form an inequilateral trapezoid shape to counteract the lateral pressure of water, or battens are used for simply supporting the partition wall of the concrete block.
4. The combined prepressing method of the concrete box girder steel pipe support of the hybrid beam cable-stayed bridge according to claim 1, wherein: when the steel strands are stacked, the stacking areas of the steel strands are in the range of 0.5m respectively along the left and right sides of the center line of the longitudinal web plate, and the upper layer and the lower layer are stacked to ensure the stability of a stacking body; according to the arrangement principle that the steel strands are stacked from the middle to the edge and from inside to outside, namely, the steel strands are stacked along the longitudinal webs located in the middle of the box girder and then sequentially stacked towards the longitudinal webs located on the two sides, and when the steel strands are stacked along each longitudinal web, the steel strands are stacked firstly on the inner side, namely, on the side relatively close to the middle of the box girder, and then on the outer side, namely, on the side relatively far away from the middle of the box girder.
5. The combined prepressing method of the concrete box girder steel pipe support of the hybrid beam cable-stayed bridge according to claim 1, wherein: during water injection, the highest and lowest water levels of a water injection area have a water head difference under the condition that a bridge deck longitudinal slope exists, and the lowest water level is taken to control the water injection height when the water depth is measured.
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| CN114441307A (en) * | 2021-12-29 | 2022-05-06 | 中铁二十局集团有限公司 | Support pre-pressing method |
| CN114809703B (en) * | 2022-05-24 | 2023-03-10 | 中建二局第三建筑工程有限公司 | Column-pulling conversion reinforcing structure and construction method thereof |
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| KR20080083374A (en) * | 2007-03-12 | 2008-09-18 | (주)삼현피에프 | Prestressed temporary bridge preloaded by cable-tie and method thereof |
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