CN113250237A - Secondary grouting construction method for piston compressor unit in high-temperature and high-humidity environment - Google Patents
Secondary grouting construction method for piston compressor unit in high-temperature and high-humidity environment Download PDFInfo
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- CN113250237A CN113250237A CN202110629077.5A CN202110629077A CN113250237A CN 113250237 A CN113250237 A CN 113250237A CN 202110629077 A CN202110629077 A CN 202110629077A CN 113250237 A CN113250237 A CN 113250237A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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Abstract
The invention relates to a secondary grouting construction method of a piston compressor unit in a high-temperature and high-humidity environment, wherein a closed construction greenhouse is built, and an air conditioning unit is adopted in the greenhouse to adjust the temperature and the humidity; a sub-bin template is erected between the concrete foundation and the equipment base to divide the whole area to be poured into five independent pouring bins; respectively pouring epoxy resin grouting materials into the pouring bins; before grouting, the components of the epoxy resin grouting material are placed at the temperature of 15-20 ℃ for more than or equal to 24 hours. The invention adopts the epoxy resin grouting material and carries out process optimization aiming at the high-temperature and high-humidity environment, has better mechanical property, has no shrinkage of the grouting layer, and ensures the high precision of equipment installation because the grouting layer is completely contacted with the bearing surface after being finally formed.
Description
Technical Field
The invention relates to a grouting construction method, in particular to a secondary grouting construction method of a piston compressor unit, which is suitable for a high-temperature and high-humidity environment.
Background
At present, the foundation of large-scale equipment needs to be roughened before grouting, and mainly adopts an impact electric hammer or a pneumatic pick to shovel out an evacuation layer on the surface of a concrete foundation manually, after broken stone aggregate is exposed out of the concrete, the surface of the concrete is blown clean by dry compressed air, and then special concrete non-shrinkage (or micro-expansion grouting material) grouting material is used for secondary grouting. However, in high-temperature and high-humidity areas, the traditional secondary grouting construction method has many inevitable defects and influences the construction quality.
Taking a constant-altitude (Wenlai) PMB petrochemical project constructed by the applicant as an example, the temperature of the Wenlai belonging to tropical rainforest climate is the obvious characteristic, the annual average temperature reaches 27.1 ℃, and the annual average temperature is kept at 28-33 ℃ for a long time; the daily average humidity is about 85 percent, the peak point is 95 percent to 98 percent, the humidity is lowest to 62 percent at cloudless noon, and the annual average rainfall is 2932 mm. The rainy season is from 11 months to 4 months in the next year. Initial tests and researches show that the traditional construction method has the defects of poor mechanical property, easy shrinkage of a grouting layer, deformation between the grouting layer and a bearing surface, and reduced precision and accuracy of equipment installation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a secondary grouting construction method of a piston compressor unit in a high-temperature and high-humidity environment, which comprises the following steps:
preparing before grouting, erecting a closed construction greenhouse, and adjusting the temperature and humidity in the greenhouse by adopting an air conditioning unit; after the concrete foundation is poured, when the initial setting is approached, namely the concrete is poured for 4-6 hours, spraying a pressurized water gun on the surface of the initial setting concrete, brushing the surface of the concrete by a steel wire brush, brushing cement paste and fine aggregate sand to expose a coarse aggregate stone part, and spraying water for maintenance every day; until the concrete reached 28 days strength. Thus, the manual roughening treatment on the concrete surface can be omitted.
Step two, supporting a formwork, namely supporting a side formwork outside the equipment base, arranging an inner formwork inside the equipment base, supporting a bin-dividing formwork between the concrete foundation and the equipment base, and dividing the whole area to be cast into five independent casting bins;
step three, secondary grouting, namely respectively pouring epoxy resin grouting materials into the pouring bins between the concrete foundation and the equipment base; placing the components of the epoxy resin grouting material at 15-20 ℃ for more than or equal to 24 hours before grouting; and controlling the environmental temperature to be 25-32 ℃ during grouting construction and within 24 hours after grouting construction.
Further, in the first step, a compressor motor adopts a temporary sizing block to match with a jackscrew for leveling, and plastic template isolation is carried out on the temporary sizing block; and (4) retesting by using a dial indicator, and extracting the temporary sizing block after the levelness of the equipment and the epoxy resin grouting material reach 75% strength.
Further, in the first step, PVC sleeves are adopted at the jackscrew and bolt positions of the base of the compressor equipment for protection, and then foaming materials are filled in gaps.
Furthermore, in the second step, a distance of 100 and 150mm is reserved between the grouting side template and the equipment base, and the distance is 100mm higher than the equipment base plate.
And further, in the third step, when the grouting distance is more than 1.5m during secondary grouting, grouting by using a high-position funnel method and auxiliary grouting by utilizing the gravity pressure difference principle, wherein the thickness of single grouting is controlled to be between 25mm and 350mm, and the grouting area exceeds 2.0 multiplied by 2.0 square meters per square meter.
Further, immediately checking the filling compactness of the slurry around the equipment after grouting is finished, if the equipment is checked to have hollowing, tamping the periphery of the hollowing by using flat iron, simultaneously adding the slurry till the slurry is complete, and detecting the installation height and the flatness of the equipment by using an instrument at the moment.
Furthermore, the foundation bolts of the compressor adopt super nuts, 8 sub-nuts are uniformly distributed on each super nut, and the stress of the super nuts is the sum of the stresses of the sub-nuts; after the three-day test block strength of the epoxy grouting material reaches 100MPa, withdrawing the jackscrew of the compressor and screwing down the foundation bolt; the super nut is characterized in that the final screwing torque value of each sub-nut is 110N.m, the sub-nuts are screwed in four stages, firstly, 30% of torque value is used for screwing, then, 50% of torque value is used for screwing, then, 80% of torque value is used for screwing, and finally, 100% of torque value is screwed; and monitoring by a dial indicator on a compressor base in the screwing process.
The invention adopts the epoxy resin grouting material and carries out process optimization aiming at the high-temperature and high-humidity environment, the epoxy resin grouting material can provide mechanical properties such as compression resistance, bonding and the like which are greatly superior to those of cement-based materials, has higher early strength, can provide operation time as long as 120 minutes (25 ℃), and is suitable for large-volume grouting. The construction method can ensure that the grouting layer has no shrinkage, the grouting layer is completely contacted with the bearing surface by more than 95% after being finally formed, the uniform load distribution of the grouting layer is ensured, and the horizontal precision of equipment installation is ensured; the epoxy grouting material has good creep resistance, can be used for a long time under severe physical working conditions of freezing and thawing alternation at minus 50 ℃ to plus 80 ℃ and vibration compression without plastic deformation, and ensures that the equipment can run stably in a normal period. The invention is especially suitable for the average annual temperature of more than 25 ℃ and less than 32 ℃. Constructing in the area with the daily average humidity of more than 85 percent, or taking measures to ensure that the environment reaches the condition.
Drawings
Fig. 1 is a schematic view of the sub-compartments of the pouring area according to the invention.
Fig. 2 is a layout view of a temporary sizing block, 1-sizing block, 2-anchor bolt in fig. 2.
Detailed Description
The invention provides a secondary grouting construction method of a piston compressor unit under a high-temperature and high-humidity environment, which comprises the following steps:
step one, preparation work before grouting.
Setting up a closed construction greenhouse, and adjusting the temperature and the humidity in the greenhouse by adopting an air conditioning unit; the environmental temperature comprises the earth surface and the air temperature, in order to obtain the optimal working state, a closed construction greenhouse needs to be built in a high-temperature and high-humidity area (such as Wenley), and an air conditioning unit for cooling and dehumidifying is adopted in the greenhouse to play double roles of cooling and dehumidifying.
After the concrete foundation is poured, spraying the surface of the initially-set concrete by using a pressurized water gun when the initial setting is approached (after the concrete is poured for 4-6 hours), brushing the surface of the concrete by using a steel wire brush, brushing cement paste and fine aggregate sand to expose a part of coarse aggregate stones, and spraying water for maintenance every day; until the concrete reached 28 days strength. The purpose is to reduce hydroxide that produces in the concrete setting process and precipitate to the concrete surface, and the hydroxide is washed clean by the water, prevents that epoxy grout material and hydroxide reaction reduce adhesive strength. Compared with the method of mechanically grinding the surface of a concrete foundation or cleaning the surface of concrete by acetic acid, the method is easier, the pH value of the concrete at the joint surface of the concrete surface contacting with the epoxy resin grouting material can be ensured, and the grouting surface is clean, dry and grease-free. Meanwhile, a chamfer edge with the thickness of 25mm can be ground on the outer edge of the concrete joint surface to increase the bonding area between the grouting material at the edge and the foundation, and the metal surface needing to be bonded is not rusted (the requirement of the smoothness of SSPC-SP6 is met).
In the first step, the compressor motor adopts a temporary sizing block to match with the jackscrew for leveling, and the temporary sizing block is isolated by a plastic template; and extracting the temporary sizing block after the epoxy resin grouting material reaches the strength.
And filling foaming materials in gaps after the jackscrew and the bolt of the compressor are protected by PVC sleeves so as to facilitate the withdrawal of the jackscrew after secondary grouting.
Step two, supporting the formwork,
and a side template is erected outside the equipment base, a bin-dividing template is erected between the concrete foundation and the equipment base, and the whole area to be cast is divided into five independent casting bins. (the picture of each bin is shown in the attached figure 1)
The template needs to be solid and firmly lapped and fixed, and grease, wax or PVC adhesive tape is smeared on the inner side of the template so as to facilitate demoulding; in order to facilitate pouring and installation of the grouting funnel, a distance of 100-150mm is reserved between the grouting side template and the equipment base, and the grouting side template is 100mm higher than the equipment bottom plate. And nailing 25mm thick 45-degree oblique angle wood lines on the horizontal height of grouting on the inner side of the template to form a grouting part chamfer so as to avoid the stress concentration of the edge of the cast body. The size of the independent pouring bin is preferably controlled within 2.0 x 2.0 square meters, and the epoxy grouting material is poured in multiple bins by times.
Step three, secondary grouting, namely respectively pouring epoxy resin grouting materials into the pouring bins between the concrete foundation and the equipment base; before grouting, the components of the epoxy resin grouting material are placed for more than or equal to 24 hours, for example, 24 to 30 hours at the temperature of 15 to 20 ℃; and controlling the environmental temperature to be 25-32 ℃ during grouting construction and within 24 hours after grouting construction.
The epoxy resin grouting material adopts a cooling and bin dividing method, and the temperature of the grouting material is reduced, so that the curing time is prolonged, and the bin dividing method avoids irregular flowing of the grouting material, and ensures that a grouting layer is finished at one time.
And during secondary grouting, when the grouting distance is more than 1.5m, grouting by using a high-position funnel method, assisting grouting by using a gravity pressure difference principle, continuously completing grouting as soon as possible, controlling the thickness of single grouting to be between 25mm and 350mm, and arranging expansion joint reserved strips in a grouting area when the grouting area exceeds 2.0 multiplied by 2.0 square meters.
The invention adopts EG-100 epoxy resin grouting material. The epoxy grouting material consists of three components, namely an epoxy resin component A, an organic amine curing agent component B and an aggregate component C. The weight ratio of the epoxy grouting material to the epoxy grouting material is A: B: C =13.5:5: 100.
The epoxy resin grouting material can provide mechanical properties such as compression resistance, bonding and the like which are greatly superior to those of cement-based materials, has higher early strength, can provide operation time of 120 minutes (25 ℃), and is suitable for large-volume grouting. The construction method can ensure that the grouting layer has no shrinkage, the grouting layer is completely contacted with the bearing surface by more than 95% after being finally formed, and the high precision of equipment installation is ensured; the epoxy resin grouting material has good creep resistance, can be used for a long time under severe physical working conditions of freezing and thawing alternation at-50 ℃ to +80 ℃ and vibration compression for a long time without plastic deformation, and ensures long-term and accurate positioning of equipment.
The technical scheme claimed by the invention is further explained by taking the secondary grouting construction of a large piston compressor in the constant-altitude (weli) PMB petrochemical project implemented by the applicant as an example.
Motor temporary sizing block matching jackscrew leveling and temporary sizing block setting
The motor is required to be installed without a sizing block, and in order to solve the problem that the base of the motor sinks in the grouting process due to unreasonable arrangement of a jackscrew, a temporary sizing block of the motor is matched with a jackscrew leveling technology and a temporary sizing block in site. And (3) carrying out plastic template isolation on the temporary sizing block in the epoxy material grouting process, extracting the temporary sizing block after the epoxy grouting material reaches the strength, wherein the arrangement diagram of the temporary sizing block is shown in figure 2, and the specification of the sizing block 1 is 200mm x 100 mm.
Firstly, a closed construction greenhouse needs to be built, and an air conditioning unit is adopted in the greenhouse to adjust the temperature and the humidity.
After the concrete foundation is poured, spraying the surface of the initially-set concrete by using a pressurized water gun when the initial setting is approached (after the concrete is poured for 4-6 hours), brushing the surface of the concrete by using a steel wire brush, brushing cement paste and fine aggregate sand to expose a part of coarse aggregate stones, and spraying water for maintenance every day; until the concrete reached 28 days strength.
Concealing before grouting: before grouting, performing foundation treatment, filling dry sand in the middle of the sleeve, isolating the motor jackscrew and the PVC pipe for the bolt, firmly installing the template, and winding a plastic belt on the inner side of the template so as to facilitate demoulding.
Preparing a compressor before secondary grouting: after the secondary alignment of the crank case and the middle cylinder is finished, the crankshaft difference and the main bearing of the compressor are checked to be qualified, and the secondary grouting preparation work of the compressor is carried out after the primary alignment of the compressor and the main motor is qualified. Before grouting, oil stain and rust on the lower surface of the compressor base are cleaned, and broken stones and dust on the surface and the periphery of the compressor base are cleaned by a compressed air pump.
The template needs to be firmly lapped, and the inner side of the template is coated with grease and wax or pasted with a PVC adhesive tape so as to be convenient for demoulding; in order to facilitate pouring and installation of the grouting hopper, at least 100-150mm distance is reserved between the grouting side template and the equipment base, and the distance is more than 100mm higher than the equipment base plate. And nailing 25mm thick 45-degree oblique angle wood strips on the horizontal height of the grouting on the inner side of the template.
The epoxy grouting material adopts a cooling and bin dividing method. Before grouting, the components of the epoxy resin grouting material are placed at 15-20 ℃ for more than or equal to 24 hours, and the temperature of the grouting material is reduced. The environmental temperature is kept between 25 and 32 ℃ during grouting construction and within 24 hours after grouting construction, and the initial setting time is prolonged. The size of the pouring bin of each bin is not more than 2.0 × 2.0 square meters, and epoxy grouting material is poured in the bin every time. As shown in FIG. 1, the grouting area is divided into 5 areas, which are first constructed, then constructed, and finally constructed.
EG-100 epoxy resin grouting material is adopted in secondary grouting of the compressor, the grouting material has no shrinkage, good high-temperature stability, good bonding performance with metal and 100MPa of minimum compressive strength per square centimeter. The epoxy grouting material consists of three components, namely an epoxy resin component A, an organic amine curing agent component B and an aggregate component C.
The curing agent (B) was first mixed with the resin (A) in a weight ratio of 13.5:5, and stirred with a hand-held stirrer at 200 and 250rpm for about 3 minutes for effective mixing. The mixed solution of A and B can not be independently placed for more than 30 minutes after being stirred, and needs to be mixed with the aggregate as soon as possible, otherwise, the mixed solution is wasted due to smoke generation and solidification caused by too fast chemical reaction.
Adding 4 bags of aggregate into a flat-opening small concrete mixer, mixing and stirring the resin curing agent mixed solution and the aggregate, keeping the rotating speed of 15-20rpm, stirring for about 4-5 minutes to effectively mix the mixture, ensuring that the mixture is completely stirred, and infiltrating the powder to perform grouting.
The addition of the aggregate needs to be monitored by a specially-assigned person on site, the weight ratio of the epoxy grouting material A to B to C =13.5 to 5 to 100, and if the mixture has low flowability, the using amount of the aggregate needs to be properly reduced, or a reactive diluent, namely the triallyl oxide ether 662, needs to be added.
The foundation grouting of a single device must be continuously carried out, and the operation time is as follows according to the field temperature of about 25-32 ℃: one to one and a half hours or so.
The main surface is required to absorb light in the construction process, and during the grouting end period, the mortar knife is used for removing bubbles on the surface of the slurry at intervals of 30 minutes so as to achieve the effect of light absorption and beauty.
Three groups of test blocks are manufactured in the construction process, and test sample inspection is respectively carried out for 3 days, 7 days and 28 days.
Checking after secondary grouting of a compressor:
in the grouting process, the grouting height is checked at any time, and the condition of local slow settlement is checked, so that the addition is reduced more and more until the grouting layer is leveled.
And immediately checking the filling compactness of the slurry around the equipment after grouting is finished. And knocking the periphery of the equipment substrate by using an iron hammer, wherein if a ding sound is emitted, the grouting layer is compact, and if a dong sound is emitted, the grouting layer is empty and bloated. If the detection shows that the hollowing exists, tamping the periphery of the hollowing by using flat iron, simultaneously adding slurry till the hollowing is complete, and detecting the installation height and the flatness of equipment by using an instrument at the moment.
After grouting, the area polluted by the grouting material is scrubbed by cotton cloth in time, and the polluted surface can be scrubbed clean by water and solvent within 2 hours.
And (3) final screwing of the super nut of the foundation bolt: the foundation bolt of the compressor adopts super nuts, 8 sub-nuts are uniformly distributed on each super nut, and the stress of each super nut is the sum of the stresses of the sub-nuts. And after the three-day test block strength of the epoxy grouting material reaches 100MPa, withdrawing the jackscrew of the compressor and screwing down the foundation bolt. The final screwing torque value of each sub-nut of the super nut is 110N.m, the sub-nuts are screwed in four stages, firstly, 30% of torque value is used for screwing, then, 50% of torque value is used for screwing, then, 80% of torque value is used for screwing, and finally, 100% of torque value is finally screwed. And monitoring by a dial indicator on a compressor base in the screwing process.
Claims (7)
1. A secondary grouting construction method of a piston compressor unit under a high-temperature and high-humidity environment is characterized by comprising the following steps:
preparing before grouting, erecting a closed construction greenhouse, and adjusting the temperature and humidity in the greenhouse by adopting an air conditioning unit; when the concrete foundation is poured, after the concrete foundation is poured, when the initial setting is approached (when the pressurized water gun is used for spraying the surface of the initial setting concrete, the steel wire brush is used for scrubbing the surface of the concrete, cement paste and fine aggregate sand are brushed off, a part of coarse aggregate stones is exposed, and simultaneously, water is sprayed for curing every day until the strength of the concrete reaches 28 days;
step two, supporting a formwork, namely supporting a side formwork outside the equipment base, arranging an inner formwork inside the equipment base, supporting a bin-dividing formwork between the concrete foundation and the equipment base, and dividing the whole area to be cast into five independent casting bins;
step three, secondary grouting, namely respectively pouring epoxy resin grouting materials into the pouring bins between the concrete foundation and the equipment base; placing the components of the epoxy resin grouting material at 15-20 ℃ for more than or equal to 24 hours before grouting; and controlling the environmental temperature to be 25-32 ℃ during grouting construction and within 24 hours after grouting construction.
2. The method of claim 1, wherein: in the first step, the motor adopts a temporary sizing block to match with a jackscrew for leveling, and plastic template isolation is carried out on the temporary sizing block; and (4) retesting by using a dial indicator, and extracting the temporary sizing block after the levelness of the equipment and the epoxy resin grouting material reach 75% strength.
3. The method of claim 2, wherein: in the first step, PVC sleeves are adopted at the jackscrew and bolt positions of the base of the compressor equipment for protection, and then foaming materials are filled in gaps.
4. The method of claim 3, wherein: in the second step, a distance of 100 plus 150mm is reserved between the grouting side template and the equipment base, and the distance is 100mm higher than the equipment base plate.
5. The method according to claim 1 or 4, characterized in that: in the third step, when the grouting distance is more than 1.5m during secondary grouting, a high-position funnel method is used for grouting, the grouting is assisted by utilizing the gravity pressure difference principle, the single grouting thickness is controlled to be between 25mm and 350mm, and the grouting area exceeds 2.0 multiplied by 2.0 square meters per hour and is divided into bins.
6. The method of claim 5, wherein: and (3) immediately checking the filling compactness of the slurry around the equipment after grouting is finished, if the equipment is checked to have hollowing, tamping the periphery of the hollowing by using flat iron, simultaneously adding the slurry till the slurry is complete, and detecting the installation height and the flatness of the equipment by using an instrument at the moment.
7. The method of claim 6, wherein: the foundation bolt of the compressor adopts super nuts, 8 sub-nuts are uniformly distributed on each super nut, and the stress of the super nuts is the sum of the stresses of the sub-nuts; after the three-day test block strength of the epoxy grouting material reaches 100MPa, withdrawing the jackscrew of the compressor and screwing down the foundation bolt; the super nut is characterized in that the final screwing torque value of each sub-nut is 110N.m, the sub-nuts are screwed in four stages, firstly, 30% of torque value is used for screwing, then, 50% of torque value is used for screwing, then, 80% of torque value is used for screwing, and finally, 100% of torque value is screwed; and monitoring by a dial indicator on a compressor base in the screwing process.
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Application publication date: 20210813 |