CN113931075A - Upper-pressing-down-hanging combined hydraulic-method prepressing and construction method for movable formwork - Google Patents
Upper-pressing-down-hanging combined hydraulic-method prepressing and construction method for movable formwork Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 88
- 238000010276 construction Methods 0.000 title claims abstract description 49
- 238000009415 formwork Methods 0.000 title claims abstract description 49
- 238000003825 pressing Methods 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 230000008569 process Effects 0.000 claims abstract description 24
- 230000005489 elastic deformation Effects 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
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- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 108700041286 delta Proteins 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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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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Abstract
The invention discloses a pressing-down and hanging combined hydraulic method prepressing and construction method for a movable formwork, which comprises the following steps: paving a plurality of sand bags on the top surface of the movable mould frame, and hanging a plurality of water bags on the bottom surface of the movable mould frame to form an upward-pressing and downward-pressing combined hydraulic method; and pre-pressing and unloading the movable mould frame by the up-pressing and down-pressing combined hydraulic method, and performing settlement observation on the movable mould frame in the pre-pressing and unloading processes to obtain observation data. According to the invention, the non-elastic deformation of the movable mould frame is eliminated under the condition of meeting the safety and economy by matching the up-pressing and down-pressing combined hydraulic method with the movable mould frame, the elastic deformation value of the movable mould frame is more accurately measured, whether the whole movable mould frame meets the safety requirement is verified, meanwhile, the water bag and the sand bag can be repeatedly utilized for multiple times, the construction cost is reduced, and the safety risk of hoisting and hoisting is reduced by carrying out water filling and water discharging operation on each sealed water bag through the water pump.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a pressing-down and hanging combined hydraulic preloading and construction method for a movable formwork.
Background
A large amount of movable formwork cast-in-place construction is inevitably needed in the construction process of the highway bridge, the formwork is required to be pre-pressed before the cast-in-place construction, and the traditional pre-pressing method comprises a sand bag stacking method, a steel strand stacking method, a reaction frame method, an earth anchor method and the like. These methods are long time consuming, large in material and labor input, and high in cost.
At present, the application time of the domestic movable formwork water bag prepressing construction technology is short, the application experience is less, and the technical principle, equipment selection, material design, structure combination, construction key points, quality risks and the like of the construction technology are not mastered by all the construction parties in comparison with the traditional construction technology.
Therefore, it is necessary to provide a method for pre-pressing and constructing the movable formwork by pressing and hanging the movable formwork by a combined hydraulic method.
Disclosure of Invention
Aiming at the problems, the invention provides a combined hydraulic method prepressing and construction method for pressing down and hanging on a movable formwork, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a combined hydraulic method prepressing and constructing method for upward pressing and downward hanging of a movable formwork comprises the following steps:
paving a plurality of sand bags on the top surface of the movable mould frame, and hanging a plurality of water bags on the bottom surface of the movable mould frame to form an upward-pressing and downward-pressing combined hydraulic method;
prepressing and unloading the movable mould frame by the up-pressing and down-pressing combined hydraulic method, and performing settlement observation on the movable mould frame in the prepressing and unloading processes to obtain observation data;
and calculating the construction reserved camber by using the observation data, and performing construction adjustment on the elevation and the central line of the movable formwork according to the construction reserved camber and the design elevation of the movable formwork.
Further, the method also comprises the following steps of carrying out no-load measurement on the movable mould frame:
adjusting the movable mould frame to the beam making elevation, and carrying out primary settlement observation on the movable mould frame to obtain no-load data;
and comparing the no-load data with the observation data to obtain comparison change data of the movable mould frame.
Further, the prepressing and unloading treatment of the movable mould frame by the up-pressing and down-pressing combined hydraulic method comprises the following steps:
arranging observation points on the surface of the main beam, and sequentially arranging a plurality of rows of main beam observation points along the main beam from the rear to the front fulcrum;
and according to the position of the main beam observation point, arranging transverse observation points relative to the position of the main beam observation point to form a plurality of template observation points.
Further, the observing the movable mould frame in the process of pre-pressing and unloading comprises the following steps:
and pasting reflective stickers on the main beam observation points and the template observation points of the movable formwork by using the steel wires, and performing settlement observation on the movable formwork by using the reflective stickers.
Further, the observing the movable mould frame in the process of pre-pressing and unloading further comprises:
pre-pressing the movable mould frame by using the up-pressing and down-pressing combined hydraulic method, and carrying out graded observation on the pre-pressing of the movable mould frame according to the loading load proportion of the pre-pressing;
when the movable mould frame is in a prepressing observation grade, firstly observing the movable mould frame for the first time by using a settlement test point, recording first observation data, observing the movable mould frame for the second time at intervals, recording second observation data, comparing the first observation data with the second observation data, and judging whether to carry out next-stage prepressing observation according to a comparison result;
if the comparison results are similar or identical, performing next-stage prepressing observation on the movable mould frame;
and if the difference of the comparison results is larger, carrying out third observation on the movable mould base again at an interval of one end of time, comparing the second observation data with the third observation data, if the difference of the second comparison results is larger, repeating the process until the adjacent two observation data are similar or identical, and carrying out next-stage prepressing observation on the movable mould base.
Further, the observing the movable mould frame in the process of pre-pressing and unloading further comprises:
carrying out reverse unloading grading on the movable mould frame according to the pre-pressed loading load proportion, and carrying out grading observation on the unloading of the movable mould frame;
and when the first-level load is unloaded, respectively carrying out unloading observation on all observation points, sequentially recording all observation data, and comparing the unloaded graded observation with the pre-pressed graded observation one by one to obtain the deflection change between the unloaded graded observation and the pre-pressed graded observation.
Further, the observing the movable mould frame in the process of pre-pressing and unloading further comprises:
when the movable mould frame is in the highest prepressing grade, performing prepressing observation on the movable mould frame;
and continuously and repeatedly carrying out prepressing observation on the movable mould base, and carrying out unloading grading observation on the movable mould base if the accumulated settlement height of the movable mould base is less than 2 mm.
Further, the calculating the construction reserved camber by using the observation data includes:
obtaining an original elevation of the movable mould frame according to no-load data of the movable mould frame, obtaining a prepressing elevation of the movable mould frame according to observation data of prepressing of the movable mould frame, and obtaining an unloading elevation of the movable mould frame according to observation data of unloading of the movable mould frame;
comparing the prepressing elevation with the unloading elevation to obtain an elastic deformation value of the movable mould frame, and calculating by utilizing the elastic deformation value of the movable mould frame and the theoretical reserved camber to obtain a construction reserved camber;
comparing the original elevation with the pre-pressed elevation to obtain the total settlement height of the movable mould frame;
and comparing the original elevation with the unloading elevation to obtain the inelastic deformation value of the movable mould frame.
The invention has the technical effects and advantages that:
1. according to the invention, the non-elastic deformation of the movable mould frame is eliminated under the condition of meeting the safety and economy by matching the up-pressing and down-pressing combined hydraulic method with the movable mould frame, the elastic deformation value of the movable mould frame is more accurately measured, whether the whole movable mould frame meets the safety requirement is verified, meanwhile, the water bag and the sand bag can be repeatedly utilized for multiple times, the construction cost is reduced, and the safety risk of hoisting and hoisting is reduced by carrying out water filling and water discharging operation on each sealed water bag through the water pump.
2. The method is carried out by combining the sealing water bag and the hoisting water bag through prepressing load, the prepressing load is loaded in a grading manner according to 1.1 times of the maximum construction load of the movable mould frame, each set of movable mould frame is firstly assembled and then prepressed by adopting the total construction load not less than 1.1 times, two adjacent sets of movable mould frames are conveniently and quickly assembled, and the combined hydraulic method of upward pressing and downward hanging has the advantages of uniform load application, good prepressing effect, no need of large machinery, simplicity in operation, less labor, high construction progress, obvious economic benefit and the like, and simultaneously meets the requirements of energy conservation, environmental protection and green construction.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 shows a schematic block diagram of a hydraulic method prepressing and construction process of a pressing-down hanging combination for a movable formwork according to an embodiment of the invention;
fig. 2 shows a moving die carrier preload arrangement diagram according to an embodiment of the invention;
fig. 3 shows a pre-compaction riser layout of the mobile mould frame according to the embodiment of the invention;
FIG. 4 illustrates a main beam observation point arrangement of an embodiment of the present invention;
FIG. 5 illustrates a template observation point layout diagram according to an embodiment of the present invention;
fig. 6 shows schematic diagrams of elastic deformation and inelastic deformation of the mobile formwork according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a hydraulic method prepressing and constructing method for pressing and hanging combination on a movable formwork, as shown in figure 1, comprising the following steps:
the method comprises the following steps: a plurality of sand bags are paved on the top surface of the movable mould frame, and a plurality of water bags are hung on the bottom surface of the movable mould frame, so that the up-pressing and down-pressing combined hydraulic method is formed.
And selecting a proper surcharge material to carry out a prepressing test on the movable formwork according to the prepressing requirement of the movable formwork and the actual condition of a construction site. The movable mould frame is pre-pressed and surmounted by mainly utilizing the water bag and the sand bag. Illustratively, the water bag is made of high-density polyethylene, and the liquid bag, the water bag and the water bag can be folded. The water is filled with water, and the density of the water is low. The prepressing liquid bag, the water bag and the water bag can be overlapped and pressed by two, so that the tonnage of prepressing of the movable mould frame can be met, and the prepressing test is completed. The practical operation process is simple, the manufacturing cost is low, and the method can be repeatedly used. The water bag is adopted to pre-press the movable mould frame, so that the method has great economic benefit, conforms to the principles of 'reduction', 'recycling', 'resource' and 'high regeneration utilization' of circular economy, and has remarkable economic, social and environmental benefits.
The water bag prepressing method has the advantages of uniform load application, good prepressing effect, no need of large-scale machinery, simple operation, less labor, fast construction progress, obvious economic benefit and the like, and simultaneously meets the requirements of energy conservation, environmental protection and green construction. The method has obvious advantages on construction sites close to water sources and high environmental protection requirements.
The pre-pressing load is carried out in a mode of combining the sealing water bag and the hoisting water bag, and the pre-pressing load is loaded in a grading mode according to 1.1 times of the maximum construction load of the movable formwork. Each set of movable mould frame is pre-pressed by the total construction load not less than 1.1 times after being assembled for the first time, so that two adjacent sets of movable mould frames can be conveniently and quickly assembled.
Before the prepressing test is carried out on the movable mould frame by utilizing an up-down pressing hanging combined hydraulic method, the no-load measurement needs to be carried out on the movable mould frame firstly, and the measurement mode is as follows:
adjusting the movable mould frame to the beam making elevation, and carrying out primary settlement observation on the movable mould frame to obtain no-load data; and comparing the no-load data with the observation data to obtain comparison change data of the movable mould frame. The initial no-load data of the movable mould base can be known in a no-load measuring mode, after the movable mould base is subjected to pre-pressing test, the no-load data and the observation data of the movable mould base are compared, the settlement amount and the elastic deformation amount of the movable mould base can be rapidly known, and therefore construction adjustment can be conducted on the whole movable mould base according to the settlement amount and the elastic deformation amount of the movable mould base, and the elevation and the central position of the movable mould base are adjusted.
Step two: and pre-pressing and unloading the movable mould frame by the up-pressing and down-pressing combined hydraulic method, and performing settlement observation on the movable mould frame in the pre-pressing and unloading processes to obtain observation data.
As shown in fig. 2 and 3, before the prepressing and unloading process is performed on the moving die frame by the up-down hanging combined hydraulic method, the prepressing weight of the up-down hanging combined hydraulic method needs to be calculated.
Illustratively, the eighth construction section of the long-rhyme road overpass bridge is connected with the first construction section, the maximum casting section is 64.75m long, and the total square amount of concrete is 804m3At 2.6t/m3The weight of the concrete is 2090t (ton), wherein the concrete without flange at the projection part of the pier body is 59.5m3The weight of the concrete is 155t, and the total weight of the flange concrete is 230m3The weight of 598t, because the flange plate is wider, the weight of final stacking load of 120% of the weight of the beam is (2090-.
TABLE 1 configuration table for prepressing load of movable mould base
It can be known from table 1 that the stowage weight of the water bags and the sand bags is almost the same as the final stowage weight of 120% of the beam weight, the prepressing test on the movable formwork can be realized by utilizing the upward pressing and downward pressing combined hydraulic method, and the quantity of the water bags and the sand bags can be increased or reduced, so that the upward pressing and downward pressing combined hydraulic method can be adapted to the prepressing test on the movable formwork with different weights, and the adaptation effect of the upward pressing and downward pressing combined hydraulic method is improved.
The water pump is matched with the water bag, the loading weight of the water bag can be adjusted, the movable die frame is observed in a grading mode by utilizing the loading load proportion, and the prepressing and unloading tests are mainly carried out on the movable die frame at five grades of 0, 60%, 80%, 100% and 120%.
Before the prepressing test of the movable mould frame is carried out by utilizing an up-down pressing hanging combined hydraulic method, settlement observation points need to be arranged on the surfaces of the main beam and the movable mould frame. As shown in fig. 4, observation points are arranged on the surface of the main beam, and a plurality of rows of main beam observation points are sequentially arranged along the main beam from the rear to the front fulcrum. Illustratively, a row of observation points is arranged from the rear to the front pivot position along the main beam to the first span 1/4, and the observation points are numbered A; 1/2, arranging a row of observation points with number B; 3/4, arranging a row of observation points, numbered C; a row of observation points is arranged at the position of a second span 1/4, and the number of the observation points is D; 1/2, arranging a row of observation points with the number E; 3/4, arranging a row of observation points, numbered F; a row of observation point numbers G are arranged at the position of 5m of the end head of the cantilever end.
As shown in fig. 5, according to the positions of the main beam observation points, the transverse observation points are arranged relative to the positions of the main beam observation points, so that a plurality of template observation points are formed. Illustratively, the template observation points are each numbered (a1 to a7, B1 to B7, C1 to C7, D1 to D7, E1 to E7, F1 to F7, and G1 to G7).
And after the settlement observation points on the surfaces of the main beam and the movable formwork are arranged, sticking reflective stickers on the main beam observation points and the template observation points of the movable formwork by using the steel wires, and performing settlement observation on the movable formwork by using the reflective stickers. Illustratively, a working base point is made at a place which is not influenced by settlement, the elevation of a settlement observation point of the movable formwork is measured by taking the working base point as a reference, the previous observation data and the first observation data are compared to obtain the current settlement and the accumulated settlement, and a settlement curve graph is drawn by using periodic observation data, so that the safety and the state of the movable formwork can be conveniently evaluated. The reflective sticker is pasted on the settlement observation point to replace a leveling rod, and can be used in places where the settlement observation point is inconvenient to stand or lay, and the carving on the sticker is the ruler surface carving of the leveling rod.
After the light reflecting paste of the settlement test point is pasted, prepressing the movable mould frame by using the up-down pressing hanging combined hydraulic method, and carrying out graded observation on the prepressing of the movable mould frame according to the loading load proportion of the prepressing. And performing pre-pressing detection on the movable mould frame mainly at five levels of 0, 60%, 80%, 100% and 120% according to the pre-pressing loading load proportion, wherein when the loading load proportion is 0, the movable mould frame is in an idle load state, and idle load data of the movable mould frame needs to be recorded.
When the movable mould base is in the prepressing observation grade, firstly observing the movable mould base for the first time by utilizing the settlement test point, recording first observation data, observing the movable mould base for the second time at intervals, recording second observation data, comparing the first observation data with the second observation data, and judging whether to carry out next-stage prepressing observation according to the comparison result. Illustratively, when the movable formwork is at a load proportion of 60%, the movable formwork is immediately subjected to first observation by using a settlement test point to obtain first observation data, and after 2h intervals, the movable formwork is subjected to second observation again to obtain second observation data. Through the mode, the pre-compression observation can be carried out on other loading load proportions.
If the comparison results are similar or identical, performing next-stage prepressing observation on the movable mould frame; and if the difference of the comparison results is larger, carrying out third observation on the movable mould base again at an interval of one end of time, comparing the second observation data with the third observation data, if the difference of the second comparison results is larger, repeating the process until the adjacent two observation data are similar or identical, and carrying out next-stage prepressing observation on the movable mould base.
TABLE 2 observation table for loading and prepressing of water bag
As shown in table 2, comparing the first observation data with the second observation data, if the observation data of the two times are almost unchanged, the prepressing test of 80% load ratio is performed on the movable die carrier. And if the change of the observation data of the first comparison is large, carrying out third observation on the movable mould frame again after 2h intervals, comparing the second observation data with the third observation data again, and if the difference of the observation data of the second comparison is large, repeating the process until the adjacent two observation data are close or the same, thereby carrying out the prepressing test of 80% loading load proportion on the movable mould frame.
When the movable mould frame is in the highest prepressing grade, performing prepressing observation on the movable mould frame; and continuously and repeatedly carrying out prepressing observation on the movable mould base, and carrying out unloading grading observation on the movable mould base if the accumulated settlement height of the movable mould base is less than 2 mm. Exemplarily, after the movable mould frame is subjected to a pre-pressing test with a load proportion of 120% and until two adjacent observation data are similar or identical, the movable mould frame is subjected to load holding for 24 hours on the basis of the load proportion of 120%, the deformation stability of the movable mould frame is taken as a reference during actual construction, and the movable mould frame is subjected to one observation every 6 hours in the load holding process; and after the accumulated deformation (settlement) of 24h is less than 2mm, starting to carry out unloading observation on the movable die carrier.
When the movable mould frame is unloaded, the movable mould frame is reversely unloaded and graded according to the loading load proportion of prepressing, so that the unloading of the movable mould frame is observed in a graded manner. And (4) unloading detection is carried out on the movable mould frame mainly at five levels of 120%, 100%, 80%, 60% and 0 according to the loading load proportion of the prepressing.
And when the first-level load is unloaded, respectively carrying out unloading observation on all observation points, sequentially recording all observation data, and comparing the unloaded graded observation with the pre-pressed graded observation one by one to obtain the deflection change between the unloaded graded observation and the pre-pressed graded observation.
Illustratively, the unloading test process of the movable formwork is observed according to the prepressing test process of the movable formwork. And recording unloading observation data with the loading load proportion of 120%, 100%, 80%, 60% and 0 levels until the movable mould frame is in the no-load state again, and comparing the observation data of the movable mould frame pre-pressing test with the observation data of the unloading test to obtain deflection comparison data of the movable mould frame at different levels of loading load proportions, so as to obtain the deflection change process of the movable mould frame.
And after the load on the movable mould frame is unloaded, carrying out one-time comprehensive inspection on all connecting parts of the movable mould frame, such as bolts, pin shafts and the like, and re-screwing the bolts according to actual conditions. The movable mold frame and the side mold supports are also checked to see if there is a deformation.
Step three: and calculating the construction reserved camber by using the observation data, and performing construction adjustment on the elevation and the central line of the movable formwork according to the construction reserved camber and the design elevation of the movable formwork.
As shown in fig. 6, when the elevation of the movable mold frame is calculated, the original elevation of the movable mold frame is obtained according to the no-load data of the movable mold frame, the prepressing elevation of the movable mold frame is obtained according to the observation data of prepressing of the movable mold frame, and the unloading elevation of the movable mold frame is obtained according to the observation data of unloading of the movable mold frame;
comparing the prepressing elevation with the unloading elevation to obtain an elastic deformation value of the movable mould frame, and calculating by utilizing the elastic deformation value of the movable mould frame and the theoretical reserved camber to obtain a construction reserved camber; comparing the original elevation with the pre-pressed elevation to obtain the total settlement height of the movable mould frame; and comparing the original elevation with the unloading elevation to obtain the inelastic deformation value of the movable mould frame.
Illustratively, the original elevation of the movable mould frame is delta 1 according to no-load data of the movable mould frame, the prepressing elevation of the movable mould frame is delta 2 according to prepressing observation data with the loading load proportion of the movable mould frame being 120%, and when the movable mould frame completely unloads the load, the movable mould frame is in a no-load state again, and the unloading elevation of the movable mould frame is delta 3.
Wherein, the total settlement of the movable mould frame is equal to delta 1-delta 2; the non-elastic deformation quantity of the movable mould frame is equal to delta 1-delta 3; the elastic deformation quantity of the movable mould frame is delta 3-delta 2.
And drawing a curve chart of prepressing loading and unloading deformation of the movable mould frame according to various working parameters of the movable mould frame obtained by prepressing test, calculating the comprehensive rigidity coefficient of the movable mould frame, and monitoring the deflection change conditions of the steel box girder and the deflection after the prepressing loading.
And after the movable mould frame is installed, adjusting the elevation and the central line of the movable mould frame according to the pre-pressed observation data and the unloaded observation data. And (4) controlling the elevation of the movable formwork to be the designed elevation and the construction reserved camber. The design elevation is provided by a design institute, and the appropriate design elevation can be provided according to the actual conditions of the site. The construction reserved camber is calculated by combining the theoretical reserved camber provided by a design institute with the corrected elastic deformation of the field movable formwork.
According to the invention, the non-elastic deformation of the movable mould frame is eliminated under the condition of meeting the safety and economy by matching the up-pressing and down-pressing combined hydraulic method with the movable mould frame, the elastic deformation value of the movable mould frame is more accurately measured, whether the whole movable mould frame meets the safety requirement is verified, meanwhile, the water bag and the sand bag can be repeatedly utilized for multiple times, the construction cost is reduced, and the safety risk of hoisting and hoisting is reduced by carrying out water filling and water discharging operation on each sealed water bag through the water pump.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A combined hydraulic method prepressing and construction method for upward pressing and downward hanging of a movable formwork is characterized in that: the method comprises the following steps:
paving a plurality of sand bags on the top surface of the movable mould frame, and hanging a plurality of water bags on the bottom surface of the movable mould frame to form an upward-pressing and downward-pressing combined hydraulic method;
prepressing and unloading the movable mould frame by the up-pressing and down-pressing combined hydraulic method, and performing settlement observation on the movable mould frame in the prepressing and unloading processes to obtain observation data;
and calculating the construction reserved camber by using the observation data, and performing construction adjustment on the elevation and the central line of the movable formwork according to the construction reserved camber and the design elevation of the movable formwork.
2. The hydraulic method prepressing and constructing method for the upper pressing-down and hanging combination of the movable formwork according to claim 1, characterized in that:
the method further comprises the following steps of carrying out no-load measurement on the movable mould frame:
adjusting the movable mould frame to the beam making elevation, and carrying out primary settlement observation on the movable mould frame to obtain no-load data;
and comparing the no-load data with the observation data to obtain comparison change data of the movable mould frame.
3. The hydraulic method prepressing and constructing method for the upper pressing-down and hanging combination of the movable formwork according to claim 1, characterized in that:
the prepressing and unloading treatment of the movable mould frame by the up-pressing and down-pressing combined hydraulic method comprises the following steps:
arranging observation points on the surface of the main beam, and sequentially arranging a plurality of rows of main beam observation points along the main beam from the rear to the front fulcrum;
and according to the position of the main beam observation point, arranging transverse observation points relative to the position of the main beam observation point to form a plurality of template observation points.
4. The hydraulic method prepressing and constructing method for the upper pressing-down and hanging combination of the movable formwork according to claim 2, characterized in that:
the observation of the movable mould frame in the process of prepressing and unloading comprises the following steps:
and pasting reflective stickers on the main beam observation points and the template observation points of the movable formwork by using the steel wires, and performing settlement observation on the movable formwork by using the reflective stickers.
5. The combined hydraulic method prepressing and constructing method for the upward pressing and hanging of the movable formwork according to claim 4, characterized in that:
the observation of the movable mould frame in the process of prepressing and unloading further comprises the following steps:
pre-pressing the movable mould frame by using the up-pressing and down-pressing combined hydraulic method, and carrying out graded observation on the pre-pressing of the movable mould frame according to the loading load proportion of the pre-pressing;
when the movable mould frame is in a prepressing observation grade, firstly observing the movable mould frame for the first time by using a settlement test point, recording first observation data, observing the movable mould frame for the second time at intervals, recording second observation data, comparing the first observation data with the second observation data, and judging whether to carry out next-stage prepressing observation according to a comparison result;
if the comparison results are similar or identical, performing next-stage prepressing observation on the movable mould frame;
and if the difference of the comparison results is larger, carrying out third observation on the movable mould base again at an interval of one end of time, comparing the second observation data with the third observation data, if the difference of the second comparison results is larger, repeating the process until the adjacent two observation data are similar or identical, and carrying out next-stage prepressing observation on the movable mould base.
6. The hydraulic method prepressing and constructing method for the upper pressing-down and hanging combination of the movable formwork according to claim 5, characterized in that:
the observation of the movable mould frame in the process of prepressing and unloading further comprises the following steps:
carrying out reverse unloading grading on the movable mould frame according to the pre-pressed loading load proportion, and carrying out grading observation on the unloading of the movable mould frame;
and when the first-level load is unloaded, respectively carrying out unloading observation on all observation points, sequentially recording all observation data, and comparing the unloaded graded observation with the pre-pressed graded observation one by one to obtain the deflection change between the unloaded graded observation and the pre-pressed graded observation.
7. The hydraulic method prepressing and constructing method for the upper pressing-down and hanging combination of the movable formwork according to claim 5, characterized in that:
the observation of the movable mould frame in the process of prepressing and unloading further comprises the following steps:
when the movable mould frame is in the highest prepressing grade, performing prepressing observation on the movable mould frame;
and continuously and repeatedly carrying out prepressing observation on the movable mould base, and carrying out unloading grading observation on the movable mould base if the accumulated settlement height of the movable mould base is less than 2 mm.
8. The hydraulic method prepressing and constructing method for the upper pressing-down and hanging combination of the movable formwork according to claim 5, characterized in that:
the calculating the construction reserved camber by using the observation data comprises the following steps:
obtaining an original elevation of the movable mould frame according to no-load data of the movable mould frame, obtaining a prepressing elevation of the movable mould frame according to observation data of prepressing of the movable mould frame, and obtaining an unloading elevation of the movable mould frame according to observation data of unloading of the movable mould frame;
comparing the prepressing elevation with the unloading elevation to obtain an elastic deformation value of the movable mould frame, and calculating by utilizing the elastic deformation value of the movable mould frame and the theoretical reserved camber to obtain a construction reserved camber;
comparing the original elevation with the pre-pressed elevation to obtain the total settlement height of the movable mould frame;
and comparing the original elevation with the unloading elevation to obtain the inelastic deformation value of the movable mould frame.
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