CN107656037B - Steel shell high-fluidity concrete performance verification method - Google Patents
Steel shell high-fluidity concrete performance verification method Download PDFInfo
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- 239000011521 glass Substances 0.000 claims description 73
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Abstract
The invention relates to a method for verifying the performance of steel shell high-fluidity concrete, which is characterized by comprising the following steps of: a plurality of models with different sizes are designed, and corresponding models are selected in sequence according to the sequence from small to large to test the performance of the high-fluidity concrete. Aiming at the construction process requirements of the steel shell high-fluidity concrete, the invention sequentially adopts multiple models to verify the influence of the process parameters such as the concrete mixing ratio, the pouring mode, the pouring speed and the like on the filling state of the concrete item by item, evaluates the filling property of the high-fluidity concrete, carries out optimization design on the mixing ratio of the high-fluidity concrete, adjusts the factors such as the construction process parameters and the like, and realizes the high-quality processing and application of the concrete.
Description
Technical Field
The invention relates to a concrete fluidity verification method, in particular to a performance verification method of steel shell high-fluidity concrete, and belongs to the field of building construction.
Background
The steel shell immersed tube forms a combined structure by wrapping the steel shell and concrete filled in the steel shell immersed tube, and the inner space of the immersed tube section is 0.5m3～13.5m3The unequal single steel bulkhead (or compartment) components are processed and spliced to form a wall body, a top plate, a bottom plate, an end plate and other parts, the assembled parts are called an integral structure, and concrete is poured into the steel bulkhead to improve the integral rigidity and strength of the pipe joint. At present, no engineering application case of the steel shell immersed tube concrete exists in China.
In order to ensure the integrity between the steel shell and the concrete, the gap between the steel shell and the concrete is required to be not more than 5mm, and the concrete in the steel compartment is fully filled, which is the key of the steel shell immersed tube construction. In order to ensure that concrete is filled compactly, longitudinal and transverse partition plate bins, pouring holes, exhaust hole positions and thin stiffening ribs need to be reasonably arranged, so that a path convenient for flowing is provided for the concrete; in the aspect of construction, the concrete is required to have high fluidity, the far end of an internal structure can be reached without vibration, the concrete can flow under the action of self weight and uniformly fill the internal space of the template, and the concrete is not weeped and layered up and down in the hardening process. The steel shell concrete combined structure can improve the integral rigidity, strength, waterproofness, durability and earthquake resistance of the pipe joint, and has the characteristics of lower cost, more convenient construction, shorter construction period, smaller structural scale and the like compared with a concrete immersed pipe.
However, the closed compartments (bays) formed by the steel shell concrete and the inner and outer steel plates can only be filled with high-fluidity concrete. Because the concrete molding state can not be observed by naked eyes, the filling condition of the concrete in the pouring process and after hardening is difficult to confirm, and the finished product can not be effectively detected. Therefore, how to ensure the construction quality of the high-fluidity concrete and effectively confirm the construction quality is a main obstacle for popularization and application of the steel shell immersed tube.
Disclosure of Invention
The invention aims to overcome the defects that whether concrete in steel shell concrete is densely filled and whether the fluidity of high-fluidity concrete meets the application requirement of the steel shell concrete cannot be effectively determined in the prior art, and provides a performance verification method of the steel shell high-fluidity concrete.
Before the construction of the steel shell immersed tube concrete, the method determines the performance state of the high-fluidity concrete through a series of tests, verifies and adjusts the technological parameters such as the mixing proportion, the pouring mode, the pouring speed and the like of the high-fluidity concrete, stably solidifies the various technological parameters in the optimal filling state, and then controls the construction quality of the steel shell high-fluidity concrete and confirms the quality of a finished product according to the parameters. The quality of the steel shell concrete can meet the design requirement, and the processing and preparation of the high-quality steel shell concrete are realized.
In order to achieve the above object, the present invention provides a technical solution:
a method for verifying the performance of steel shell high-fluidity concrete comprises the following steps: a plurality of models with different sizes are designed, and corresponding models are selected in sequence according to the sequence from small to large to test the performance of the high-fluidity concrete.
The invention adopts various models with different sizes to carry out concrete performance verification tests in the order from small to large, and simultaneously adjusts and optimizes the concrete mixing ratio (formula) according to each verification result. In the test process of each model, slump expansion and T of the machine concrete and the concrete after pumping are detected500、V75Funnel outflow time, U-shaped instrument filling height, gas content, volume weight and the like. The mixing proportion of the adjusted concrete is ensured to meet the performance requirements of other aspects, and the concrete can be controlled to meet the specific high-fluidity requirement. The method is combined with a design method of the high-fluidity concrete, corresponding verification work is carried out in the design process, the qualified high-fluidity concrete meets the design requirement after verification and is determined to meet the actual construction requirement, the method has the characteristic of high-efficiency high-quality combination, and the engineering quality can be better ensured.
And further, selecting corresponding models in sequence from small to large to test the performance of the high-fluidity concrete. If the performance test is qualified, a larger model is used for testing; if the performance test fails, the adjustment is performed and then the test is performed again. The high-fluidity concrete can meet the test of a corresponding model through repeated optimization and adjustment, and then the test of a larger model is carried out, so that the test and adjustment and optimization are repeated until the performance of the finally obtained concrete meets the requirement.
Preferably, if the model test fails, at least one of the following is adjusted: (1) adjusting the mix proportion of concrete, and (2) pouring; (3) and (5) pouring speed.
The concrete mixing proportion is adjusted by at least one of the following items: the additive composition is selected and combined with the mixing amount, the sand rate, the coarse aggregate proportion, the water-powder ratio, the water-glue ratio, the cementing material and the like.
After adjusting the mix proportion of the concrete, testing the concrete: slump spread, T500、V75At least one of funnel flow time, U-meter fill height, gas content, volume weight and temperature, preferably simultaneously. And performing a model pouring test after the concrete performance test is qualified, and performing a larger model test after the concrete performance test is qualified until all test project requirements are met.
Further, the model includes four kinds of not unidimensional models, specifically includes wood model, organic glass compartment small model, organic glass wall model, organic glass top surface + steel compartment full scale model, and above-mentioned model increases in proper order.
In the invention, four models with different sizes are designed, and the performance verification and adjustment are carried out according to the following steps: wood model verification → adjustment → verification of organic glass compartment small model → adjustment → verification of organic glass wall model → adjustment → verification of organic glass top surface + steel compartment full scale model → determination of steel shell high fluidity concrete construction process parameters. The method comprises the steps of sequentially carrying out verification tests on four models from small to large to determine whether the performance of the concrete meets the design requirements, carrying out adjustment and optimization in time, and carrying out corresponding optimization and adjustment on the high-fluidity concrete to solve the possible performance problems in the process of scale amplification research.
Preferably, the wood model can be replaced by other materials, such as organic glass, steel plates and the like, and is preferably made of wood plates, so that the wood model is convenient to process, disassemble and recycle and the like. If made of other materials, the properties are slightly different, and the final quality is not influenced.
Further, the procedure for performing the test using four different size models is as follows:
(1) verifying the concrete fluidity by adopting a wood model, carrying out the next test after the performance test is qualified, and otherwise, adjusting, and verifying the concrete fluidity by adopting the wood model again;
(2) verifying the concrete fluidity by adopting an organic glass compartment small model, carrying out the next test after the performance test is qualified, and otherwise, adjusting, and then verifying the concrete fluidity by adopting the organic glass compartment small model again;
(3) verifying the concrete fluidity by adopting an organic glass wall model, carrying out the next test after the performance test is qualified, and otherwise, adjusting, and then verifying the concrete fluidity by adopting the organic glass wall model again;
(4) and verifying the concrete fluidity by adopting an organic glass top surface and steel compartment full-scale model, and determining the construction process parameters of the steel shell high-fluidity concrete.
Further, the wood pattern includes A, B two construction forms, model A and model B.
Wherein, the center of the top surface of the model A is provided with a pouring opening with a diameter, and four corners are respectively provided with an exhaust hole. The upper top surface and the lower bottom surface inside the model are both made of L-shaped steel and flat steel to manufacture steel ribs.
The construction of the model B is set up similarly/identically to the model a except that the concrete pouring opening is adjusted from the center of the top surface to the corners. The concrete pouring amount of a single wood model is 0.3-0.8m3Preferably about 0.5m3。
Preferably, the diameter of the pouring opening is 25cm, the pouring opening is externally connected with a conduit with the height of 100cm, and the conduit is a PVC conduit. Preferably, the exhaust hole is externally connected with an organic glass exhaust pipe with the diameter of 5cm and the height of 50 cm.
Preferably, the wood pattern is 100cm by 50cm in size.
Preferably, the wooden forms are composed of glued wooden forms.
Further, the organic glass compartment small model is characterized in that one corner of the upper top surface of the model is provided with a pouring opening, the other three corners are provided with exhaust holes, and the upper top surface inside the model is made of L-shaped steel and flat steel to form steel ribs. The upper top surface and the peripheral templates of the model are made of organic glass, the bottom surface is a steel template, and the concrete pouring volume of the single organic glass compartment small model is 1.5-1.8m3。
According to the organic glass compartment small model, the upper top surface and the surrounding templates of the model are made of transparent organic glass, the bottom surface is a steel template, concrete is poured into the model from the top, technicians can conveniently observe the concrete flowing condition in the model from all directions, and the organic glass compartment small model has important significance for optimizing and adjusting the mix proportion of the concrete and pouring parameters of the concrete in the construction process.
Preferably, the diameter of the pouring opening is 25cm, and the pouring opening is externally connected with a conduit with the height of 100 cm.
Preferably, the exhaust hole is externally connected with an organic glass exhaust pipe with the diameter of 5cm and the height of 50 cm.
Preferably, the size of the organic glass compartment small model is 150cm multiplied by 75 cm.
Furthermore, the top surface of the organic glass wall model is not provided with a sealing cover, the front surface and the two end doors are both made of organic glass, and the rear surface and the bottom surface are both made of steel plates; stiffening plates, stiffening ribs and reinforcing cages in different directions are arranged in the model, and the periphery of the model is fixed by a triangular structure formed by diagonal draw bar I-shaped steel; the concrete pouring volume of a single organic glass wall model is 4-5m3Preferably 4.5m3。
The structure of the organic glass wall model is provided with a plurality of stiffening plates, stiffening ribs and reinforcing cages designed by simulation design drawings, and the flowing condition of the high-fluidity concrete in the wall-shaped model is restored. Has direct guiding significance for optimizing the mix proportion of concrete, the concrete pouring process parameters and the like.
Preferably, the plexiglas wall model has dimensions of 600cm by 30cm by 250 cm.
Further, the organic glass top surface + steel compartment full scale model, the top surface is visual organic glass, and all around and the bottom surface are the steel sheet, and peripheral a week adopts shaped steel reinforcement to form. The pouring guide pipe is arranged at the center of the top surface, vent holes are uniformly arranged at four corners of the top surface, and the concrete pouring volume of a single model is 12-15m3Preferably 13.5m3。
Preferably, the size of the model is 300cm multiplied by 150cm, the pouring guide pipe is arranged in the center of the top surface, the diameter is 25cm, and the height is 100 cm.
Preferably, the exhaust hole is externally connected with an organic glass exhaust pipe with the diameter of 5cm and the height of 50 cm.
The top surface of the organic glass top surface and the top surface of the steel compartment full-scale model are made of visual organic glass, and the rest parts of the organic glass top surface and the steel compartment full-scale model are made of steel plates for actual pouring construction, and the structure of the organic glass top surface and the steel compartment full-scale model is consistent with that of a concrete flowing steel shell in the actual construction process. Meanwhile, a pouring guide pipe is arranged in the center of the top of the model, and vent holes are arranged at four corners. The application condition of the high-fluidity concrete in the model is truly presented, the pouring construction condition of the high-fluidity concrete in the steel shell is reflected in a one-to-one equal proportion, and the optimization adjustment of the actual pouring parameters is guided.
Further, the high flow concrete performance test includes at least one of a fill compaction test or a top clearance test for concrete.
Preferably, the top clearance is detected by using a measuring ruler + a feeler gauge. Preferably, the clearance between the concrete upper surface of the three models, namely the wood model, the organic glass compartment small model, the organic glass top surface and the steel compartment full scale model, and the top surface template is tested by using a measuring ruler and a clearance gauge. Model filling was evaluated by testing of the top gap.
Preferably, the maximum clearance is controlled not to exceed a design value in terms of the maximum clearance between the upper surface of the concrete and the top form. The clearance between the concrete upper surface and the top surface template is less than or equal to 5mm, and more preferably, the clearance is less than or equal to 2.5 mm. In addition, an organic glass wall model is designed to research the flowing filling performance of the high-fluidity concrete in the continuous wall model, and the high-fluidity concrete is ensured to have good performance in all aspects in the application of the steel shell concrete.
Further, the performance test comprises a top clearance test, and the clearance between the upper surface of the concrete model and the top surface template is detected by adopting a measuring ruler and a clearance gauge method to evaluate the filling property of the high-fluidity concrete.
Further, the top gap test comprises the following steps:
(1) and (3) removing the top surface template of the model, keeping the side mold in place, and cleaning up sundries attached to the upper edge of the side mold.
(2) The feeler measuring surface is wiped clean with a clean cloth. The measurement can not be carried out under the condition that the feeler gauge is stained with oil stains or metal scraps, otherwise, the accuracy of the measurement result is influenced.
(3) The measuring ruler is placed close to the top edge of the side mold, and two ends of the measuring ruler are tightly pressed.
(4) Inserting the feeler gauge into a gap between the measuring scale and the upper surface of the model, and pulling the feeler gauge back and forth to feel a little resistance, which indicates that the gap value is close to the value marked on the feeler gauge; if the resistance is too large or too small when the plug is pulled, the gap value is smaller or larger than the value marked on the feeler.
(5) When the clearance is measured and adjusted, the feeler which meets the clearance specification is selected to be inserted into the clearance to be measured, then the feeler is pulled while adjusting until the lock nut is screwed down when slight resistance is felt, and the numerical value marked by the feeler is the clearance value to be measured.
(6) And gap detection is carried out according to the distance that the transverse distance is not more than 15cm and the longitudinal distance is not more than 50cm, and the positions of the vent hole, the pouring opening and the bubble with a larger area are avoided in the detection process.
Further, the length of the measuring scale is not less than 2m, the maximum deflection is 0.05mm, and the flatness error is not more than +/-14/2000; the precision of the feeler gauge is not less than 0.1mm, and the measuring range is not less than 5 mm.
Further, the results for the fillability evaluation are processed as follows: taking the arithmetic mean value of all measurement results as the clearance between the upper surface of the model and the top surface template, and accurately obtaining the clearance of 0.1 mm; the maximum gap value for this model is recorded and is marked in the test report.
Further, in the test process of each model, the slump expansion and T of the concrete and the concrete after pumping are detected500、V75The flow time of the funnel, the filling height of the U-shaped instrument, the gas content, the volume weight and the temperature are detected, and the filling property of the model concrete is detected according to the filling property test mode.
And further, according to the performance and filling detection result of each model test concrete, adjusting technological parameters such as mixing ratio, pouring mode, pouring speed and the like until the filling of the model reaches the best (the gap between the upper surface of the concrete model and the top surface template is less than 5mm), and then controlling the construction quality of the steel shell high-fluidity concrete according to the parameters.
The new technical scheme provided by the invention can mainly realize the following technical effects:
1. the method adopts four models with different sizes, such as a wood model, an organic glass compartment small model, an organic glass wall model, an organic glass top surface and a steel compartment full-scale model, and researches and determines the performance and construction parameters of the high-fluidity concrete in the steel shell concrete through the sequence of gradually approaching the solid structure of the steel shell immersed tube from small to large.
2. According to the concrete performance and filling detection results, technological parameters such as the mixing proportion, the pouring mode, the pouring speed and the like of the high-fluidity concrete are continuously verified and adjusted until the filling performance of the model reaches the best, and then the construction quality of the steel shell high-fluidity concrete is controlled according to the parameters.
3. In the process of changing from small to large, the method firstly adopts a common wood model, then adopts a transparent observable side wall model and finally adopts a transparent top model, so that the observation in all directions in the pouring process of the high-fluidity concrete is sufficient, and finally, the side wall steel plate compartment of the equal proportion model is consistent with the actual construction, and the result reliability is high.
Description of the drawings:
fig. 1 is a design drawing of a wood pattern a.
Fig. 2 is a design drawing of a wood pattern B.
Fig. 3 is a design drawing of a small organic glass compartment model.
Fig. 4 is a three-dimensional view of a plexiglas wall model.
Fig. 5 is a design drawing of a plexiglas wall model.
FIG. 6 is a design drawing of a full-scale model of the organic glass top surface and the steel compartment.
FIG. 7 is a schematic illustration of the filling of the dipstick + feeler gauge test model.
The labels in the figure are: 1-pouring opening/pouring guide pipe, 2-exhaust guide pipe, 3-L-shaped steel, 4-shaped steel support rod, 5-front and rear glass wall end panels, 6-glass wall side panels, 7-side templates, 8-model concrete top surface and 9-measuring scale.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
< example >
Four model devices "from small to large" were prepared. As shown in fig. 1 to 4, fig. 1 is a design drawing of a wood pattern a, fig. 2 is a design drawing of a wood pattern B, and the dimensions of the wood pattern a and the wood pattern B are both 100cm × 100cm × 50cm, except for the position of a pouring opening. FIG. 3 is a design drawing of a small organic glass compartment model, wherein the size of the small organic glass compartment model is 150cm multiplied by 75 cm. FIG. 4 is a three-dimensional view of a plexiglas wall model having dimensions of 600cm by 30cm by 250 cm. FIG. 5 is a design drawing of a plexiglass wall model, and FIG. 6 is a design drawing of a plexiglass top surface + steel compartment full-scale model, the dimensions of which are 300cm × 300cm × 150 cm. In fig. 1-3 and 6, the casting conduit is positioned at the center of the top surface, and has a diameter of 25cm and a height of 100 cm.
According to the performance verification method of the steel shell high-fluidity concrete, the models shown in the figures 1-6 are adopted, before the steel shell immersed tube concrete construction, the process parameters of the high-fluidity concrete mix proportion, the pouring mode, the pouring speed and the like are verified and adjusted according to the field process test of gradually approaching the solid structure from small to large through a wood model, an organic glass compartment small model, an organic glass wall model, an organic glass top surface and a steel compartment full-scale model, and the process test contents are shown in the table 1.
TABLE 1 content of the process tests
The method comprises the steps of pouring 4 wood models in a wood model test, adopting a pumping and tank-hanging process for pouring, conveying concrete out of a machine to a ground pump through a mixing and transporting vehicle, discharging the concrete, conveying the concrete to the site through a 254-meter pump pipe by the ground pump, discharging the concrete to a tank-hanging process, and finally completing the whole pouring process through tank-hanging and discharging, wherein the maximum pumping height is 14.7m, and the pouring speed is 2.5 cm/min. The high-fluidity concrete is stirred and produced by adopting a full-automatic stirring station, all raw materials are automatically fed, metered, stirred and discharged, and the concrete is stirred for 3m each time3And the stirring time is not less than 120s after the feeding is finished. Detecting slump expansion and T of concrete discharged from each tray500、V75Performance indexes such as funnel outflow time, U-shaped appearance fill height, air content, unit weight and temperature, when all performance indexes all accord with the requirement, the concrete is transported to the scene, otherwise abandonment. And testing the filling performance of the high-fluidity concrete in the model, and FIG. 7 is a schematic diagram of measuring scale and clearance gauge for detecting the filling performance of the model. After the top template is dismantled, the top end face of the side template is cleaned, the measuring scale is pressed on the top of the side template, and the clearance between the measuring scale and the concrete top surface is tested by inserting the feeler gauge. The wood pattern test uses the concrete mixing ratio optimized in the laboratory test, and is specifically shown in table 2.
TABLE 2 compounding ratios used in the technical tests
According to the test result of the wood pattern, the concrete pouring process is adjusted to be direct pumping, after the concrete is discharged from the machine, the concrete is transported to a ground pump through a mixing transport vehicle for unloading, the concrete is transported to the site through a 220-meter pump pipe by the ground pump, the pump pipe is inserted into the top of a pouring opening, then the concrete is directly poured through the pouring opening, and the pouring speed is 5 cm/min. And the mixing ratio parameters of the water-cement ratio, the using amount of the cementing material and the like of the concrete are adjusted. And performing a first organic glass compartment small model test according to the test result, and pouring 2 models.
According to the first organic glass compartment small model test result, keeping the concrete pouring process unchanged, and adjusting the concrete pouring speed again: the rising speed of the concrete liquid level is 5cm/min, and the pouring speed of the concrete is reduced to 2.5cm/min when the concrete is poured to the top surface. And adjusting the mixing ratio parameters of the water-cement ratio, the using amount of the cementing material, the sand rate and the like of the concrete. And performing a second organic glass compartment small model test according to the test result, and pouring 3 models.
According to the result of the second organic glass compartment small model test, the concrete pouring process and the concrete pouring speed are kept unchanged, and the components of the concrete admixture are adjusted. And carrying out a third organic glass compartment small model test according to the test result, and pouring 2 models.
According to the third organic glass compartment small model test result, the concrete pouring process and the concrete pouring speed are kept unchanged, and the concrete admixture components are adjusted again. Therefore, the organic glass wall model test is carried out, and 1 model is poured.
According to the test result of the organic glass wall model, the concrete pouring process and the concrete pouring speed are kept unchanged, and the components of the concrete admixture are adjusted again. And performing a full-scale model test of the organic glass top surface and the steel compartment, and pouring 1 model. The final technological parameters such as the mixing proportion of the high-fluidity concrete, the pouring process, the pouring speed, the concrete performance control index and the like are determined by the full-scale model test of the organic glass top surface and the steel compartment. And in the construction process of the steel shell high-fluidity concrete, controlling the construction quality of the steel shell high-fluidity concrete and confirming the quality of a finished product according to the parameters. The results of the model filling test for each field process test are shown in table 3.
TABLE 3 Process test model Filability test
The verification and verification of the embodiment show that the performance of the high-fluidity concrete is fully researched and verified, and the optimal design and adjustment of the high-fluidity concrete are carried out, so that the slump expansion and the T of the concrete500、V75Performance indexes such as funnel flow time, U-shaped appearance fill height, air content, unit weight and temperature, all meet the requirements as whole performance index, and the fillability of high mobile concrete in the model is good, and the packing is closely knit all around, and the top surface clearance is minimum, and inside no bubble defect. The high-fluidity concrete verified, adjusted and optimized by the method provided by the invention has excellent quality and meets the construction requirements of steel shell concrete.
Claims (6)
1. A performance verification method for steel shell high-fluidity concrete is characterized by comprising the following steps: designing a plurality of models with different sizes, and sequentially selecting corresponding models according to the sequence from small to large to test the performance of the high-fluidity concrete;
the model comprises four models with different sizes, specifically comprises a wood model, an organic glass compartment small model, an organic glass wall model, an organic glass top surface and steel compartment full-scale model, and the models are sequentially enlarged;
the wood model comprises A, B two construction forms, namely a model A and a model B;
wherein, the center of the top surface of the model A is provided with a pouring opening with the diameter, and four corners are respectively provided with an exhaust hole; the upper top surface and the lower bottom surface inside the model are both made of L-shaped steel and flat steel to manufacture steel ribs; the construction and arrangement of the model B are similar to/same as those of the model A, except that the concrete pouring opening is adjusted to the corners from the center of the top surface;
the concrete pouring amount of a single wood model is 0.3-0.8m3；
If the performance test is qualified, a larger model is used for testing;
if the performance test fails, adjusting at least one of the following: (1) adjusting the mixing proportion of the concrete; (2) pouring modes; (3) pour speed and then retest.
2. The method of claim 1, wherein the testing using four different size models is performed as follows:
(1) verifying the concrete fluidity by adopting a wood model, carrying out the next test after the performance test is qualified, and otherwise, adjusting, and verifying the concrete fluidity by adopting the wood model again;
(2) verifying the concrete fluidity by adopting an organic glass compartment small model, carrying out the next test after the performance test is qualified, and otherwise, adjusting, and then verifying the concrete fluidity by adopting the organic glass compartment small model again;
(3) verifying the concrete fluidity by adopting an organic glass wall model, carrying out the next test after the performance test is qualified, and otherwise, adjusting, and then verifying the concrete fluidity by adopting the organic glass wall model again;
(4) and verifying the concrete fluidity by adopting an organic glass top surface and steel compartment full-scale model, and determining the construction process parameters of the steel shell high-fluidity concrete.
3. The performance verification method of claim 1, wherein a pouring opening is arranged at one corner of the upper top surface of the organic glass compartment small model, exhaust holes are arranged at the other three corners of the upper top surface of the organic glass compartment small model, and steel ribs are made on the upper top surface inside the model by adopting L-shaped steel and flat steel;
the upper top surface and the surrounding templates of the model are made of organic glass, and the bottom surface is a steel template;
the concrete pouring volume of a single organic glass compartment small model is 1.5-1.8m3。
4. The method of claim 1, wherein the plexiglas wall model is uncapped from the top surface, the front and both end doors are made of plexiglas, and the back and bottom surfaces are made of steel plates;
stiffening plates, stiffening ribs and reinforcing cages in different directions are arranged in the model, and the periphery of the model is fixed by a triangular structure formed by diagonal draw bar I-shaped steel;
the concrete pouring volume of a single organic glass wall model is 4-5m3。
5. The performance verification method of claim 1, wherein the organic glass top surface and the steel compartment full-scale model are formed by reinforcing the periphery of the visible organic glass, the periphery and the bottom surface are made of steel plates, and the periphery of the visible organic glass is reinforced by section steel;
the pouring guide pipe is arranged at the center of the top surface, vent holes are uniformly arranged at four corners of the top surface, and the concrete pouring volume of a single model is 12-15m3。
6. The method of claim 1, wherein the high flow concrete performance test comprises at least one of a fill compaction test or a top clearance test for concrete.
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| CN108426826A (en) * | 2018-06-15 | 2018-08-21 | 中国电建集团成都勘测设计研究院有限公司 | Experimental rig for concrete vibrating quality testing |
| CN109680612B (en) * | 2018-12-11 | 2024-02-06 | 中交一公局土木工程建筑研究院有限公司 | Assembled capping beam pier column straight joint model and joint filling construction process using same |
| CN109440652B (en) * | 2018-12-11 | 2024-02-06 | 中交一公局集团有限公司 | Full-scale model of fabricated bent cap pier pile and crack pouring construction process using full-scale model |
| CN111721926A (en) * | 2020-06-12 | 2020-09-29 | 上海市基础工程集团有限公司 | Cement soil continuous steel wall construction cement soil state change test observation device |
| CN111855580A (en) * | 2020-07-28 | 2020-10-30 | 上海市基础工程集团有限公司 | Cement soil state contrast test device for cement soil continuous steel wall construction |
| CN112378909A (en) * | 2020-11-13 | 2021-02-19 | 保利长大工程有限公司 | Steel shell immersed tube self-compacting concrete production quality evaluation control method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092824A (en) * | 2016-05-31 | 2016-11-09 | 中铁十四局集团第三工程有限公司 | A kind of self-compacting concrete mobility-detected device and detection method |
-
2017
- 2017-08-30 CN CN201710764931.2A patent/CN107656037B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092824A (en) * | 2016-05-31 | 2016-11-09 | 中铁十四局集团第三工程有限公司 | A kind of self-compacting concrete mobility-detected device and detection method |
Non-Patent Citations (2)
| Title |
|---|
| 高流动性混凝土综述及在沉管隧道中的应用;林鸣 等;《中国港湾建设》;20170228;第37卷(第2期);第1-8页 * |
| 高流动混凝土施工中的质量控制;王丽敏;《交通世界》;20110630(第12期);第155-156页 * |
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