CN115492171A - Simulation experiment device and method for underwater concrete pouring and service process - Google Patents
Simulation experiment device and method for underwater concrete pouring and service process Download PDFInfo
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- CN115492171A CN115492171A CN202110675555.6A CN202110675555A CN115492171A CN 115492171 A CN115492171 A CN 115492171A CN 202110675555 A CN202110675555 A CN 202110675555A CN 115492171 A CN115492171 A CN 115492171A
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- 239000004567 concrete Substances 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 57
- 230000008569 process Effects 0.000 title claims abstract description 41
- 238000004088 simulation Methods 0.000 title claims abstract description 28
- 239000000243 solution Substances 0.000 claims abstract description 64
- 230000007246 mechanism Effects 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 23
- 239000007924 injection Substances 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 9
- 230000007613 environmental effect Effects 0.000 claims description 21
- 239000004033 plastic Substances 0.000 claims description 17
- 239000002689 soil Substances 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 230000010412 perfusion Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 230000003628 erosive effect Effects 0.000 description 11
- 239000003112 inhibitor Substances 0.000 description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910001425 magnesium ion Inorganic materials 0.000 description 3
- 239000003755 preservative agent Substances 0.000 description 3
- 230000002335 preservative effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 238000012018 process simulation test Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
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- 238000005530 etching Methods 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a simulation experiment device and a simulation experiment method for a concrete underwater pouring and service process, which belong to the technical field of engineering construction and comprise a concrete pouring mechanism, a concrete collecting mechanism and a pressurized water injection mechanism; the concrete collecting mechanism comprises a tank body and a first top cover hermetically and fixedly connected with the tank body, a drain valve is arranged at the upper part of the side wall of the tank body, a concrete pouring groove is arranged in the inner cavity of the tank body, and a through hole and a discharging hole matched with a switch are formed in the first top cover; the concrete pouring mechanism comprises a pouring cylinder and a second top cover provided with a first exhaust valve, the upper end opening of the pouring cylinder is fixedly connected with the second top cover in a sealing mode, the lower end opening of the pouring cylinder is matched with the blanking hole and is fixedly connected in a detachable and sealed mode, a vertical solution hole is formed in the side wall of the pouring cylinder, the bottom end opening of the solution hole is communicated with the through hole in a sealing mode, and the top end opening of the solution hole is communicated with the inner cavity of the pouring cylinder on the upper portion of the side wall of the pouring cylinder. The simulation experiment device provided by the invention has the advantages that the structure is convenient to disassemble and assemble, and the underwater concrete pouring process and the early service process are reproduced.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a simulation experiment device and a simulation experiment method for underwater concrete pouring and service processes.
Background
The concrete pile foundation is a common reinforced concrete structure in power transmission line and bridge engineering, wherein, compared with the traditional driven-in type reinforced concrete precast pile, the pipe-sinking cast-in-place pile can save 50% of reinforcing steel bars, and the manufacturing cost can be generally reduced by about 30% under the condition of the same bearing capacity. Therefore, the method is widely applied to high-rise buildings such as high-rise buildings, power transmission lines, launching towers, bridge engineering, earthquake-resistant engineering and the like. The concrete immersed tube cast-in-place pile faces severe risk of reducing bearing capacity of sulfate-corroded concrete matrix and corrosion risk of corroding internal steel bars by chloride salt in a saline soil environment rich in strong corrosive media such as sulfate, chloride salt, magnesium salt and the like. Therefore, the concrete for pouring can be doped with the preservative, the rust inhibitor, the corrosion-resistant rust inhibitor, the hydrophobic compacting agent and the like, so that the corrosion medium permeability resistance of the cast-in-place concrete pile, the chloride ion critical concentration of corrosion of the steel bar and the like are improved, and the service life of the cast-in-place concrete pile is prolonged.
However, the method for measuring the effect of improving the capability of corrosion resisting media of products such as the corrosion inhibitor, the rust inhibitor, the corrosion and rust inhibitor, the hydrophobic compacting agent and the like is mostly to mix with other concrete raw materials in a laboratory, and test the sulfate-resistant corrosion resistance coefficient, the concrete impermeability, the RCM value and the steel bar corrosion time by adopting vibration molding and standard curing to a specified age.
The difference between the indoor vibration forming and standard curing process and the actual concrete immersed tube cast-in-place pile underwater pouring process is large, and the differences are mainly reflected in the following two aspects:
(1) When the cast-in-place pile concrete is poured underwater, concrete is discharged from the immersed tube and directly contacts with a water body rich in erosion ions;
(2) After pouring is completed and the immersed tube is pulled out, the pile foundation concrete in a plastic state is directly contacted with the surrounding soil body in the gradual hardening process, and the soil body is often rich in erosive ions.
Engineering technicians urgently hope to know the actual action effect of the internally doped anti-erosion medium capability improving material, so that a concrete underwater pouring and service process simulation test device is urgently needed to be researched and designed for reproducing the concrete underwater pouring process and the early service process of the contact state of the plastic concrete and the soil.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a simulation experiment device and a simulation experiment method for the underwater concrete pouring and service process, which are used for reproducing the underwater concrete pouring process and the early service process of the contact state of plastic concrete and soil.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
on one hand, the invention provides a simulation experiment device for a concrete underwater pouring and service process, which comprises a concrete pouring mechanism, a concrete collecting mechanism and a pressurized water injection mechanism;
the concrete collecting mechanism comprises a tank body with an upper opening and a first top cover which is detachably, hermetically and fixedly connected with the upper opening of the tank body, a drain valve communicated with an inner cavity of the tank body is arranged at the upper part of the side wall of the tank body, a concrete pouring groove surrounded by environmental soil is arranged in the inner cavity of the tank body, the inner cavity of the tank body is communicated with the pressurized water injection mechanism, the pressurized water injection mechanism is used for injecting environmental solution into the inner cavity of the tank body, and a through hole and a discharging hole provided with a switch are formed in the first top cover;
the concrete pouring mechanism comprises a pouring cylinder with an upper opening and a lower opening and a second top cover provided with a first exhaust port, a first exhaust valve is arranged on the first exhaust port, an upper port of the pouring cylinder is detachably and hermetically fixedly connected with the second top cover, a lower port of the pouring cylinder is matched with a lower hole and detachably and hermetically fixedly connected with the lower port, a vertical solution hole is formed in the side wall of the pouring cylinder, a bottom port of the solution hole is hermetically communicated with the through hole, and a top port of the solution hole is communicated with the inner cavity of the pouring cylinder on the upper part of the side wall of the pouring cylinder.
Further, pressurization water injection mechanism includes intelligent booster pump, pump line and is used for the solution tank of storage environment solution, the water inlet of intelligence booster pump pass through the pump line communicate in the solution tank, the delivery port of intelligence booster pump pass through the pump line communicate in jar internal chamber.
Further, the tank body and a sealing ring is arranged between the first top cover, and the filling cylinder and the first top cover and the second top cover are both provided with sealing rings.
Furthermore, the switch in unloading hole is rotary switch, rotary switch includes swing arm and tray, the swing arm is rotatable and rotate the sealed setting in of connection site on the first top cap, the tray with the swing arm is connected and is enough to cover fill a section of thick bamboo lower port.
Furthermore, a safety valve is arranged on the upper part of the side wall of the tank body.
Furthermore, the safety valve is a spring micro-opening safety valve with the set pressure higher than the set pressure of the intelligent booster pump.
Further, the environmental solution in the pressurized water injection mechanism is a high-concentration erosion ion solution.
Furthermore, the pressure control range of the intelligent booster pump is 0.1MPa to 10MPa, and the precision is 0.1MPa.
Furthermore, still including the third top cap that is equipped with the second gas vent, be equipped with second discharge valve on the second gas vent, the third top cap be used for in the concrete service in-process can dismantle sealed rigid coupling in jar body upper end mouth.
On the other hand, the invention provides a using method of a simulation experiment device for the underwater concrete pouring and service process, which comprises the following steps:
tamping and solidifying soil layers of an environment to be simulated layer by layer in a tank to be poured, placing the tank in a tank body, closing a drain valve, hermetically installing a first top cover, closing a rotary switch, sealing and installing a pouring cylinder on the first top cover, and ensuring that a blanking hole and a through hole of the first top cover are respectively aligned with a lower port of the pouring cylinder and a solution hole;
injecting plastic concrete into the pouring cylinder, sealing and installing the second top cover at the upper port of the pouring cylinder, and opening the first exhaust valve on the second top cover;
pumping environmental solution into the tank body gradually by using an intelligent booster pump, closing a first exhaust valve when the solution overflows from a first exhaust port corresponding to the first exhaust valve, and continuously boosting the pressure to the maximum set pressure corresponding to the simulated perfusion depth;
rotating to open the rotary switch, dropping the plastic concrete into the tank to be poured under the action of gravity, and repeating the plastic concrete pouring operation until enough plastic concrete is poured;
the water pressure is removed, the drain valve of the tank body is opened, the first top cover and the concrete pouring mechanism are removed, the third top cover is arranged at the upper end opening of the tank body in a sealing mode, the drain valve of the tank body is closed, and the second exhaust valve is opened;
and pumping environmental solution into the tank body gradually by using the intelligent booster pump, closing the second exhaust valve when the solution overflows from the second exhaust port corresponding to the second exhaust valve, continuously boosting the pressure to the maximum set pressure corresponding to the simulated pouring depth, maintaining the concrete to a specific age and carrying out subsequent concrete performance energetic tests.
Compared with the prior art, the invention has the following beneficial effects:
the simulation experiment device provided by the invention comprises a concrete pouring mechanism, a concrete collecting mechanism and a pressurizing water injection mechanism connected with the concrete collecting mechanism, can simulate an underwater pouring process of a immersed tube filling pile and an early hardening process of poured concrete, and can be used for simulating a deepwater pouring environment with set pressure by injecting environmental solution into the concrete collecting mechanism through the pressurizing water injection mechanism, realizing the purpose of aiming at a water body or a soil body environment with large depth and high pressure and rich in erosive ions, and researching the change courses of the strength, the compactness, the impermeability and the like of the underwater poured concrete;
by preparing the environmental solution in advance, the initial ion distribution of the poured concrete in the early hardening process can be continuously contacted with high-pressure and high-concentration erosion ions (sulfate ions, chloride ions, magnesium ions and the like), and the application effect of the product such as the preservative, the rust inhibitor, the corrosion and rust inhibitor, the hydrophobic compacting agent and the like on the medium erosion resistant product in the underwater poured concrete can also be evaluated;
the simulation experiment device and the application method thereof have the advantages of simple operation and convenient assembly and disassembly, solve the problem that the sample cannot be taken after the cast-in-place immersed tube cast-in-place pile is poured, and facilitate the subsequent development of various research works.
Drawings
Fig. 1 is a schematic structural diagram of a simulation test device for underwater concrete pouring and service processes provided by an embodiment of the invention;
FIG. 2 is a top view of a first header according to an embodiment of the present invention;
fig. 3 is a top view of a first cover according to an embodiment of the present invention when a rotary switch is opened;
fig. 4 is a schematic structural diagram of a simulation test device for underwater concrete pouring and service process in a simulation state of a concrete service process according to an embodiment of the present invention.
In the figure:
1. a solution tank; 2. an intelligent booster pump; 3. a pump tube; 4. an inner cavity of the tank body; 5. a tank to be filled; 6. a tank body; 7. a drain valve; 8. a safety valve; 9. a bolt; 10-1, a first sealing ring; 10-2, a second sealing ring; 10-3, a third sealing ring; 11. a first top cover; 12. a rotary switch; 12-1, rotating rod; 12-2, a tray; 13. a through hole; 14. filling a cylinder; 15-1, vertical solution holes; 15-2, an inner wall water outlet; 16. a second top cover; 17. a first exhaust valve; 18. bolt holes; 19. a flange; 20. a blanking hole; 21. a third top cover; 22. a second exhaust valve; 23. a first exhaust port; 24. a second exhaust port.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1, an embodiment of the present invention provides a simulation experiment apparatus for a concrete underwater pouring and service process, the apparatus includes a concrete pouring mechanism, a concrete collecting mechanism, and a pressurized water injection mechanism connected to the concrete collecting mechanism.
In this embodiment, the concrete collecting mechanism includes a tank body 6 with an upper opening and a first top cover 11 detachably and hermetically fixed to the upper opening of the tank body 6, and a drain valve 7 communicated with the tank body inner chamber 4 is disposed on the upper portion of the side wall of the tank body 6. A concrete pouring groove 5 enclosed by environmental soil is arranged in the tank body inner cavity 4, and the tank body inner cavity 4 is communicated with a pressurizing water injection mechanism. The tank inner cavity 4 is used for containing an environmental solution to be poured into the tank 5 and injected by the pressurizing water injection mechanism, and the tank 5 is used for pouring concrete by the concrete pouring mechanism. The first top cover 11 is provided with a through hole 13 and a blanking hole provided with a switch, wherein the top view of the first top cover 11 is shown in fig. 2.
The concrete pouring mechanism comprises a pouring cylinder 14 with an upper opening and a lower opening and a second top cover 16 provided with a first exhaust port 23, a first exhaust valve 17 is arranged on the first exhaust port 23, the upper port of the pouring cylinder 14 is detachably and fixedly connected with the second top cover 16 in a sealing mode, the lower port of the pouring cylinder 14 is matched with a blanking hole and detachably and fixedly connected in a sealing mode, a vertical solution hole 15-1 is formed in the side wall of the pouring cylinder 14, the bottom port of the solution hole is communicated with a through hole 13 in a sealing mode, and the top port of the vertical solution hole 15-1 is communicated with the inner cavity of the pouring cylinder 14 through an inner wall water outlet 15-2 in the upper portion of the side wall of the pouring cylinder 14.
In this embodiment, pressurization water injection mechanism includes intelligent booster pump 2, pump line 3 and is used for storing the solution tank 1 of environment solution, and the water inlet of intelligent booster pump 2 communicates in solution tank 1 through pump line 3, and the delivery port of intelligent booster pump 2 communicates in jar internal chamber 4 through pump line 3.
The solution tank 1 stores therein an environmental solution prepared in advance to simulate an environment, for example, a high-concentration etching ion solution (containing sulfate ions, chloride ions, magnesium ions, and the like).
As shown in fig. 1, a sealing ring is disposed between the tank 6 and the first top cover 11, and a sealing ring is disposed between the filling cylinder 14 and each of the first top cover 11 and the second top cover 16, which are sequentially described as a first sealing ring 10-1, a second sealing ring 10-2, and a third sealing ring 10-3 for convenience of description. In the assembling process, the first sealing ring 10-1 is arranged between the flange 19 of the upper port of the tank body 6 and the first top cover 11, and the bolts 9 penetrate through the matched bolt holes 18 on the tank body 6 and the first top cover 11 to be tightly assembled together, and similarly, the second sealing ring 10-2 and the third sealing ring 10-3 are respectively arranged between the first top cover 11 and the pouring cylinder 14, and between the pouring cylinder 14 and the second top cover 16, and the assembling mode of the bolts 9 can be adopted.
In the embodiment of the present invention, as shown in fig. 3, the switch of the discharging hole is specifically selected to be a rotary switch 12, the rotary switch 12 includes a rotary rod 12-1 and a tray 12-2, the rotary rod 12-1 is rotatably and rotatably connected to the first top cover 11 in a sealing manner, and the tray 12-2 is connected to the rotary rod 12-1 and is sufficient to cover the lower port of the pouring cylinder 14. When the material discharging device needs to be opened, the rotary rod 12-1 is rotated to enable the tray 12-2 to be shifted so as to open the material discharging hole; when the feeding device is closed, the rotary rod 12-1 is rotated to enable the tray 12-2 to be buckled on the locking bayonet at the feeding hole so as to seal the feeding hole.
In order to enhance the safety performance of the simulation experiment device, a safety valve 8 is arranged at the upper part of the side wall of the tank body 6. Wherein, the safety valve 8 is a spring micro-open type safety valve 8 with the set pressure higher than the set pressure of the intelligent booster pump 2. Specifically, the pressure control range of the intelligent booster pump 2 is 0.1MPa to 10MPa, and the accuracy is 0.1MPa.
In order to better simulate the high-pressure and deep-water pouring environment, the tank body 6, the first top cover 11, the second top cover 16 and the pouring barrel 14 of the simulation experiment device are all made of stainless steel.
In the embodiment of the present invention, as shown in fig. 4, the simulation experiment apparatus further includes a third top cover 21 provided with a second air outlet 24, the second air outlet 24 is provided with a second air outlet valve 22, wherein the third top cover 21 is used for being detachably, hermetically and fixedly connected to an upper port of the tank 6 in the concrete service process, so as to simulate the service process.
As a specific embodiment of the invention, the material of the tank body 6 is stainless steel, the inner diameter is 400mm to 1000mm, the wall thickness is 10mm to 20mm, and the inner diameter is 500mm to 1000mm.
The first top cover 11 and the third top cover 21 are made of stainless steel, the diameter is 450mm-1050 mm, and the thickness is 10mm-20mm.
The material of the filling cylinder 14 is stainless steel, the inner diameter is 100mm-200mm, the wall thickness is 10mm-20mm, the inner diameter is 500mm-1000mm, the width of flanges 19 at two ends of the filling cylinder 14 is 30mm-50mm, the thickness of the flanges 19 of the filling cylinder 14 is 10mm-20mm, the diameter of a vertical solution hole 15-1 in the cylinder wall is 3mm-8mm, and the depth of a water outlet 15-2 on the inner wall of the top is 5mm-20mm.
The pressure control range of the intelligent booster pump 2 is 0.1-10MPa, and the precision is 0.1MPa; the safety valve 8 is a spring micro-opening safety valve 8, and the set pressure is higher than the set pressure of the intelligent booster pump 2.
The embodiment of the invention also provides a use method of the simulation experiment device for the underwater concrete pouring and service process, which comprises the following steps:
the method comprises the steps of placing a tank 5 to be poured, which is to be tamped and solidified layer by layer of the environmental soil layer to be simulated, in a tank body 6, closing a drain valve 7, hermetically mounting a first top cover 11, closing a rotary switch 12, and hermetically mounting a pouring cylinder 14 on the first top cover 11, so as to ensure that a discharging hole and a through hole 13 of the first top cover 11 are aligned with a solution hole and a lower port of the pouring cylinder 14 respectively;
injecting plastic concrete into the pouring cylinder 14, sealing and installing the second top cover 16 at the upper port of the pouring cylinder 14, and opening the first exhaust valve 17 on the second top cover 16;
pumping environmental solution into the tank body 6 gradually by using the intelligent booster pump 2, closing the first exhaust valve 17 when the solution overflows from the first exhaust port 23 corresponding to the first exhaust valve 17, and continuously boosting the pressure to the maximum set pressure corresponding to the simulated perfusion depth;
rotating to open the rotary switch 12, dropping the plastic concrete into the tank 5 under the action of gravity, and repeating the plastic concrete injection operation until enough plastic concrete is injected;
the water pressure is removed, the drain valve 7 of the tank body 6 is opened, the first top cover 11 and the concrete pouring mechanism are removed, the third top cover 21 is hermetically arranged at the upper port of the tank body 6, the drain valve 7 of the tank body 6 is closed, and the second exhaust valve 22 is opened;
and pumping environmental solution into the tank body 6 gradually by using the intelligent booster pump 2, closing the second exhaust valve 22 when the solution overflows from the second exhaust port 24 corresponding to the second exhaust valve 22, continuously boosting the pressure to the maximum set pressure corresponding to the simulated pouring depth, maintaining the concrete to a specific age and carrying out subsequent concrete performance energy tests.
With reference to the foregoing specific embodiments, a description will be given below of an operation method of the concrete underwater pouring and service process simulation test device provided by the embodiments of the present invention, specifically including the following steps:
step 1: placing a polytetrafluoroethylene plate with the same size as the inner diameter of the tank body 6 into the tank body 6, placing an acrylic plate box (such as 100mm in thickness, 300mm in width and 300mm in height) with the same shape as the concrete to be poured into the center of the inner cavity 4 of the tank body, filling the environment soil such as underground soil or clay taken back from the site and the like into the peripheries of the acrylic plate box and the tank body 6, tamping layer by layer and curing, and then lifting the acrylic plate box to form a concrete to-be-poured groove 5;
and 2, step: closing a drain valve 7 on the tank body 6, installing a first top cover 11, closing a rotary switch 12, installing an injection cylinder 14, ensuring that a through hole 13 on the first top cover 11 is aligned with a vertical solution hole 15-1 in the cylinder wall of the injection cylinder 14, injecting fresh concrete into the injection cylinder 14 without blocking a water outlet 15-2 on the inner wall of the top part, installing a second top cover 16 of the injection cylinder 14, and opening a first drain valve 17 on the top part;
and step 3: gradually pumping an aggressive solution which is prepared according to the field concentration into the tank body 6 by using the intelligent booster pump 2, after the tank body 6 is filled with the aggressive solution, enabling the solution to flow into the filling cylinder 14 through the through hole 13 of the first top cover 11 on the tank body 6 and the vertical solution hole 15-1 in the cylinder wall of the filling cylinder 14, closing the first exhaust valve 17 when the solution overflows from the exhaust hole corresponding to the exhaust valve 17, and continuously working the intelligent booster pump 2 until the maximum set pressure corresponding to the field filling depth is reached;
and 4, step 4: the rotary switch 12 is turned on by rotation, and the up-down pressure of the plastic concrete in the pouring cylinder 14 is consistent, so that the plastic concrete can fall into the to-be-poured groove 5 in the tank body 6 under the action of gravity;
and 5: if necessary, the water pressure can be removed, the first exhaust valve 17 and the exhaust valve 7 of the tank body 6 are opened, partial solution is discharged, the second top cover 16 on the pouring cylinder 14 is opened, the rotary switch 12 is closed, fresh concrete is poured into the pouring cylinder 14 again, and the steps 3 and 4 are repeated until the maximum amount of concrete is poured;
and 6: the water pressure is unloaded, the first exhaust valve 17 and the exhaust valve 7 of the tank body 6 are opened, partial solution is discharged, the first top cover 11, the filling cylinder 14, the second top cover 16 and the like are dismantled and cleaned, vibration or insertion tamping is carried out if necessary, the third top cover 21 is installed, the exhaust valve 7 of the tank body 6 is closed, the second exhaust valve 22 is opened, aggressive solution is gradually pumped into the tank body 6 by using the intelligent booster pump 2, the second exhaust valve 22 is closed when the solution overflows from the second exhaust valve 22, pressurization is continuously carried out to the maximum set pressure corresponding to the simulated filling depth, maintenance is carried out to a specific age, hardened concrete in the tank body 6 is taken out for subsequent treatment such as cutting, grinding and titration, and the like, and the strength change of the high-pressure underwater poured concrete rich in aggressive ions at different ages, the ion erosion state at the early stage of hardening and the lifting effect of the anti-medium erosion material are analyzed.
The simulation experiment device provided by the invention comprises a concrete pouring mechanism, a concrete collecting mechanism and a pressurizing water injection mechanism connected with the concrete collecting mechanism, can simulate an underwater pouring process of a immersed tube pouring pile and an early hardening process of poured concrete, and can be used for simulating a deepwater pouring environment with set pressure by injecting environmental solution into the concrete collecting mechanism through the pressurizing water injection mechanism, aiming at a water body or a soil body environment with large depth and high pressure and rich in erosive ions, and researching the change processes of the strength, compactness, impermeability and the like of underwater poured concrete;
by preparing the environmental solution in advance, the initial ion distribution can be realized when the poured concrete is continuously contacted with high-pressure and high-concentration erosion ions (sulfate ions, chloride ions, magnesium ions and the like) in the early hardening process, and the application effect of medium erosion resistant products such as a preservative, a rust inhibitor, a corrosion and rust inhibitor, a hydrophobic compacting agent and the like in underwater poured concrete can also be evaluated;
the simulation experiment device and the application method thereof have the advantages of simple operation and convenient assembly and disassembly, solve the problem that the sample cannot be taken after the cast-in-situ immersed tube cast-in-place pile is poured, and facilitate the subsequent development of various research works.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A simulation experiment device for underwater concrete pouring and service processes is characterized by comprising a concrete pouring mechanism, a concrete collecting mechanism and a pressurizing water injection mechanism;
the concrete collecting mechanism comprises a tank body with an upper opening and a first top cover which is detachably, hermetically and fixedly connected with the upper opening of the tank body, a drain valve communicated with an inner cavity of the tank body is arranged at the upper part of the side wall of the tank body, a concrete pouring groove surrounded by environmental soil is arranged in the inner cavity of the tank body, the inner cavity of the tank body is communicated with the pressurized water injection mechanism, the pressurized water injection mechanism is used for injecting environmental solution into the inner cavity of the tank body, and a through hole and a discharging hole provided with a switch are formed in the first top cover;
the concrete pouring mechanism comprises a pouring cylinder with an upper opening and a lower opening and a second top cover provided with a first exhaust port, a first exhaust valve is arranged on the first exhaust port, an upper port of the pouring cylinder is detachably and hermetically fixedly connected with the second top cover, a lower port of the pouring cylinder is matched with a blanking hole and detachably and hermetically fixedly connected with the blanking hole, a vertical solution hole is formed in the side wall of the pouring cylinder, a bottom port of the solution hole is hermetically communicated with the through hole, and a top port of the solution hole is communicated with the inner cavity of the pouring cylinder on the upper portion of the side wall of the pouring cylinder.
2. The experimental apparatus for simulating underwater concrete pouring and service according to claim 1, wherein the pressurizing and water injecting mechanism comprises an intelligent booster pump, a pump pipe and a solution tank for storing environmental solution, a water inlet of the intelligent booster pump is communicated with the solution tank through the pump pipe, and a water outlet of the intelligent booster pump is communicated with the inner cavity of the tank body through the pump pipe.
3. The device for simulating the underwater concrete pouring and service process according to claim 2, wherein a sealing ring is arranged between the tank body and the first top cover, and a sealing ring is arranged between the pouring cylinder and the first top cover and the second top cover.
4. The device for simulating the underwater concrete pouring and service process according to claim 1 or 3, wherein the switch of the discharging hole is a rotary switch, the rotary switch comprises a rotary rod and a tray, the rotary rod is rotatably arranged on the first top cover in a sealing manner, and a rotary connecting part of the rotary rod is connected with the rotary rod and is sufficient for covering the lower port of the pouring cylinder.
5. The device for simulating the underwater concrete pouring and service process according to claim 4, wherein a safety valve is arranged at the upper part of the side wall of the tank body.
6. The simulation experiment device for the underwater concrete pouring and service process according to claim 5, wherein the safety valve is a spring micro-start safety valve with a set pressure higher than that of the intelligent booster pump.
7. The simulation experiment device for the underwater concrete pouring and service process according to claim 1 or 2, wherein the environmental solution in the pressurized water injection mechanism is a high-concentration corrosive ion solution.
8. The simulation experiment device for the underwater concrete pouring and service process as claimed in claim 2, wherein the pressure control range of the intelligent booster pump is 0.1MPa to 10MPa, and the precision is 0.1MPa.
9. The device for simulating the underwater concrete pouring and service process according to claim 1, further comprising a third top cover provided with a second air outlet, wherein a second air outlet valve is arranged on the second air outlet, and the third top cover is detachably, hermetically and fixedly connected to an upper port of the tank body in the concrete service process.
10. A use method of a simulation experiment device for a concrete underwater pouring and service process is characterized by comprising the following steps:
the method comprises the steps of placing a tank to be poured, compacted and solidified layer by layer, of an environment soil layer to be simulated in a tank body, closing a drain valve, hermetically mounting a first top cover, closing a rotary switch, and hermetically mounting a pouring cylinder on the first top cover to ensure that a discharging hole and a through hole of the first top cover are aligned to a lower port of the pouring cylinder and a solution hole respectively;
injecting plastic concrete into the pouring cylinder, sealing and installing the second top cover at the upper port of the pouring cylinder, and opening the first exhaust valve on the second top cover;
pumping environmental solution into the tank body gradually by using an intelligent booster pump, closing a first exhaust valve when the solution overflows from a first exhaust port corresponding to the first exhaust valve, and continuously boosting the pressure to the maximum set pressure corresponding to the simulated perfusion depth;
rotating to open the rotary switch, dropping the plastic concrete into the tank to be poured under the action of gravity, and repeating the plastic concrete pouring operation until enough plastic concrete is poured;
the water pressure is removed, the drain valve of the tank body is opened, the first top cover and the concrete pouring mechanism are removed, the third top cover is arranged at the upper end opening of the tank body in a sealing mode, the drain valve of the tank body is closed, and the second exhaust valve is opened;
and pumping environmental solution into the tank body gradually by using the intelligent booster pump, closing the second exhaust valve when the solution overflows from the second exhaust port corresponding to the second exhaust valve, continuously boosting the pressure to the maximum set pressure corresponding to the simulated pouring depth, maintaining the concrete to a specific age and carrying out subsequent concrete performance energetic tests.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675555.6A CN115492171B (en) | 2021-06-18 | Simulation experiment device and method for underwater concrete pouring and service process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675555.6A CN115492171B (en) | 2021-06-18 | Simulation experiment device and method for underwater concrete pouring and service process |
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| CN115492171B CN115492171B (en) | 2024-05-14 |
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