CN112962682A - Installation and construction method for shock insulation pad of LNG storage tank and preformed hole positioning tool - Google Patents
Installation and construction method for shock insulation pad of LNG storage tank and preformed hole positioning tool Download PDFInfo
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- CN112962682A CN112962682A CN202110165736.4A CN202110165736A CN112962682A CN 112962682 A CN112962682 A CN 112962682A CN 202110165736 A CN202110165736 A CN 202110165736A CN 112962682 A CN112962682 A CN 112962682A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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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
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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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
- E02D27/38—Foundations for large tanks, e.g. oil tanks
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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
- E02D2300/0001—Rubbers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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Abstract
The invention belongs to the technical field of LNG storage tanks, and discloses an installation and construction method of an LNG storage tank shock insulation cushion, which comprises the following steps: fixing a lower layer circular ring positioning steel plate in the preformed hole positioning tool with the ground pile template; pouring ground pile concrete into the ground pile template to the designed pile foundation top surface elevation to form a pile foundation, wherein the ground pile concrete embeds the corrugated pipe into the ground pile template; the method comprises the steps of installing expansion bolts on the top surface of a pile foundation, aligning pre-embedded bolts of the shock insulation cushion with reserved holes, placing the pre-embedded plates of the shock insulation cushion on the expansion bolts, fixing the tops of the expansion bolts and the lower bottom surfaces of the pre-embedded plates of the shock insulation cushion through spot welding, and installing the shock insulation cushion on the pre-embedded plates of the shock insulation cushion. The method solves the problems that the requirement on positioning and mounting accuracy of the rubber support of the shock insulation cushion is extremely high, the construction of the preformed hole of the shock insulation cushion is difficult, and the positioning accuracy of the traditional method for positioning the pre-buried plate of the shock insulation cushion is poor and the efficiency is low in the mounting construction process of the shock insulation cushion.
Description
Technical Field
The invention belongs to the technical field of LNG storage tanks, and particularly relates to an installation construction method of an LNG storage tank shock insulation pad and a preformed hole positioning tool.
Background
Liquefied Natural Gas (LNG) is a green and clean energy source favored by countries in the world due to its advantages of low pollution, low consumption, complete combustion, etc. In the development of the Liquefied Natural Gas (LNG) industry, the storage of Liquefied Natural Gas (LNG) is a key link, and the cryogenic storage tank of Liquefied Natural Gas (LNG) is a key core in the storage and transportation process of Liquefied Natural Gas (LNG), and is also the infrastructure with the largest investment in the receiving station of Liquefied Natural Gas (LNG), which accounts for 1/2-1/3 of the cost of the whole receiving station. The seismic fortification standard of the Liquefied Natural Gas (LNG) low-temperature storage tank is high, and a general pile foundation is difficult to bear large horizontal force generated under the action of an earthquake, so that effective seismic insulation measures need to be taken.
The seismic fortification standard of the Liquefied Natural Gas (LNG) low-temperature storage tank is high, a general pile foundation is difficult to bear large horizontal force generated under the action of an earthquake, and effective seismic isolation measures need to be taken, as shown in FIG. 5. At present, a domestic storage tank adopts a high-pile bearing platform structure, the storage tank bearing platform and an upper tank body are supported on a pile foundation by adopting rubber shock insulation pads, and are anchored into the top of the pile foundation by adopting anchor bolts and are grouted by using a high-strength non-shrinkage grouting material.
At present, the rubber shock insulation cushion arranged between the pile top and the bearing platform is the most mature shock insulation technology with wide application. However, the problems that the requirement on the positioning and mounting accuracy of the rubber support of the shock insulation pad is extremely high, the construction of a preformed hole of the shock insulation pad is difficult, the positioning accuracy of the traditional method for positioning the pre-embedded plate of the shock insulation pad is poor, the efficiency is low, and a honeycomb pitted surface and cracks are easy to appear on a grouting layer exist in the mounting and construction process of the shock insulation pad.
Disclosure of Invention
The invention aims to provide an installation construction method of an LNG storage tank shock insulation pad and a preformed hole positioning tool, and aims to solve the problems that a preformed hole is difficult to place, an embedded plate is difficult to position, a grouting layer is prone to honeycomb pitted surface and cracks and the like in the installation process of the existing shock insulation pad.
In order to achieve the purpose, the invention provides the following technical scheme: an installation and construction method of an LNG storage tank shock insulation cushion comprises the following steps:
s100, mounting a preformed hole positioning tool: fixing a lower layer circular ring positioning steel plate in the preformed hole positioning tool with the ground pile template;
s200, pouring ground pile concrete: pouring ground pile concrete into the ground pile template to the designed pile foundation top surface elevation to form a pile foundation, wherein the ground pile concrete embeds the corrugated pipe into the ground pile template;
s300, installing a shock insulation pad: the method comprises the steps of installing expansion bolts on the top surface of a pile foundation, aligning pre-embedded bolts of the shock insulation cushion with reserved holes, placing the pre-embedded plates of the shock insulation cushion on the expansion bolts, fixing the tops of the expansion bolts and the lower bottom surfaces of the pre-embedded plates of the shock insulation cushion through spot welding, and installing the shock insulation cushion on the pre-embedded plates of the shock insulation cushion.
Preferably, the installation and construction method of the shock insulation pad of the LNG storage tank of the present invention includes, before installing the preformed hole positioning tool, the steps of:
s001, prefabricating a preformed hole positioning tool according to the number, the size and the spacing of the embedded bolts of the shock insulation rubber support;
s002 filling underground engineering pile, installing ground pile template on the underground engineering pile.
Preferably, the installation and construction method of the shock insulation pad of the LNG storage tank of the present invention includes the following steps after the preformed hole positioning tool is installed:
s110, mounting a corrugated pipe: and penetrating the corrugated pipe through the hollow upright post in the preformed hole positioning tool, screwing and fixing the corrugated pipe by using a transverse bolt, and plugging the lower end of the corrugated pipe to prevent concrete from entering.
Preferably, the installation and construction method of the shock insulation pad for the LNG storage tank according to the present invention includes the following steps after the ground pile concrete is poured:
s210, preformed hole forming: and when the ground pile concrete is initially set, the preformed hole positioning tool is detached, and the exposed corrugated pipe is cut off, so that the top end of the corrugated pipe is flush with the top surface of the pile foundation, and the preformed hole is formed.
Preferably, the installation and construction method of the shock insulation pad for the LNG storage tank of the present invention, wherein the installation of the shock insulation pad specifically comprises the steps of:
s301, after the concrete curing period is over, chiseling the concrete on the top surface of the pile foundation, then punching the top surface of the pile foundation, and driving expansion bolts into the holes respectively.
Preferably, the installation and construction method of the shock insulation pad for the LNG storage tank according to the present invention includes the following steps after the preformed hole is formed:
s211, carrying out incoming inspection and acceptance on the shock insulation cushion and the embedded part;
s212, installing lower anchor bars and embedded plates;
s213, installing a grouting material template;
s214, positioning the horizontal position and the elevation of the embedded plate, and checking the levelness;
s215, pouring grouting material into the grouting material template: continuously and uninterruptedly grouting for 3min, repeatedly pushing a booster for 2min, increasing the number of exhaust holes of the embedded plate by the diameter of a grouting opening of the embedded plate being 35cm, and performing press polish treatment on the concrete pouring vibration holes and the exhaust holes of the positioned embedded plate for flattening by a spatula 50-70min after grouting;
and S216, after the grouting material is poured, positioning the horizontal position and the elevation of the embedded plate, and performing levelness retest.
Preferably, the installation and construction method of the shock insulation pad for the LNG storage tank according to the present invention includes the following steps after the installation of the shock insulation pad:
s310, retesting the installation accuracy;
and S320, installing anchor bars.
The invention also provides a preformed hole positioning tool, which consists of a double-layer connected circular ring positioning steel plate and a downward-penetrating corrugated pipe, wherein a plurality of circular holes are formed in the circular ring positioning steel plate, and the two layers of circular ring positioning steel plates are connected by adopting a hollow upright post.
Preferably, the inner diameter of the hollow upright posts is equal to the diameter of the round holes, the number of the hollow upright posts is consistent with the number of the round holes formed in the single-layer circular ring positioning steel plate, and the positions of the hollow upright posts are overlapped with the round holes in the upper and lower layers of circular ring positioning steel plates.
Preferably, as a preformed hole positioning tool of the present invention, a transverse bolt is fixed beside each circular hole on the upper layer circular ring positioning steel plate for fixing the corrugated pipe, and the lower layer circular ring positioning steel plate is used for fixing the preformed hole positioning tool and the pile foundation concrete pouring template.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, before the ground pile concrete is poured into the ground pile template, the preformed hole positioning tool is installed, so that the problems that the requirement on positioning and installation accuracy of the rubber support of the shock insulation pad is extremely high, the construction of the preformed hole of the shock insulation pad is difficult, and the positioning accuracy of the traditional shock insulation pad pre-embedded plate positioning method is poor and the efficiency is low in the shock insulation pad mounting construction process are solved.
(2) The method continuously and uninterruptedly performs grouting until the liquid level of grouting material is flush with the pre-buried plate of the shock insulation cushion, the pouring time is controlled to be 3min, the time for repeatedly pushing the booster is controlled to be 2min, the diameter of the grouting opening of the pre-buried plate is controlled to be 35cm, the number of the exhaust holes of the pre-buried plate is increased to 24, the area ratio of the exhaust holes is increased to 6.8% from the original 3.6%, and the problem that the surface and the cracks of a honeycomb easily appear on the grouting layer is solved.
Drawings
FIG. 1 is one of the flow charts of the installation and construction method of the shock insulation pad of the LNG storage tank of the invention;
FIG. 2 is a second flowchart of the installation and construction method of the shock insulation pad of the LNG storage tank of the invention;
FIG. 3 is a flow chart of another embodiment of the installation and construction method of the shock insulation pad of the LNG storage tank of the invention;
FIG. 4 is a schematic structural view of a preformed hole positioning tool according to the present invention;
FIG. 5 is a schematic view of the installation of a vibration isolation pad in the prior art;
in the figure: 1. positioning the pre-buried plate; 2. anchor bars are arranged; 3. a shock insulation pad; 4. lower anchor bars; 5. a hollow upright post; 6. an upper layer circular ring positioning steel plate; 7. a transverse bolt; 8. a lower ring positioning steel plate; 9. a bellows; 10. ground pile template.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides the following technical solutions: an installation and construction method of an LNG storage tank shock insulation cushion comprises the following steps:
s100, mounting a preformed hole positioning tool: fixing a lower layer circular ring positioning steel plate 8 in the preformed hole positioning tool with a ground pile template 10;
s200, pouring ground pile concrete: pouring ground pile concrete into the ground pile template 10 to the designed pile foundation top surface elevation to form a pile foundation, wherein the corrugated pipe 9 is embedded in the ground pile concrete;
s300, installing a shock insulation pad: installing expansion bolts on the top surface of a pile foundation, aligning the pre-embedded bolts of the shock insulation cushion with the reserved holes, placing the pre-embedded plates of the shock insulation cushion on the expansion bolts as supports for fixing the pre-embedded plates of the shock insulation cushion, adjusting the vertical elevation, the horizontal degree and the levelness of the pre-embedded plates of the shock insulation cushion, fixing the top of the expansion bolts and the lower bottom surface of the pre-embedded plates of the shock insulation cushion through spot welding, and installing the shock insulation cushion on the pre-embedded plates of the shock insulation cushion.
Further, the method comprises the following steps before the positioning tool for installing the prepared hole:
s001, prefabricating a preformed hole positioning tool according to the number, the size and the spacing of the embedded bolts of the shock insulation rubber support;
s002, the underground engineering pile is poured, and a ground pile template 10 is installed on the underground engineering pile.
Further, the installation after the preformed hole location frock include the step:
s110, mounting the corrugated pipe 9: and (3) penetrating the corrugated pipe 9 through the hollow upright post 5 in the preformed hole positioning tool, screwing and fixing the corrugated pipe by using the transverse bolt 7, and plugging the lower end of the corrugated pipe 9 to prevent concrete from entering.
Further, the method comprises the following steps after the ground pile concrete is poured:
s210, preformed hole forming: and when the ground pile concrete is initially set, the preformed hole positioning tool is detached, and the exposed corrugated pipe 9 is cut off, so that the top end of the corrugated pipe 9 is flush with the top surface of the pile foundation to form the preformed hole.
Further, the mounting of the vibration isolation cushion specifically comprises the steps of:
s301, after the concrete curing period is over, chiseling the concrete on the top surface of the pile foundation, then punching the top surface of the pile foundation, and driving expansion bolts into the holes respectively.
Further, the method comprises the following steps after the preformed hole is formed:
s211, carrying out incoming inspection and acceptance on the shock insulation cushion and the embedded part; the shock insulation pad is a rubber shock insulation pad;
s212, installing lower anchor bars and embedded plates;
s213, installing a grouting material template;
s214, positioning the horizontal position and the elevation of the embedded plate, and checking the levelness;
s215, pouring grouting material into the grouting material template: continuously and uninterruptedly grouting for 3min, repeatedly pushing a booster for 2min, increasing the number of exhaust holes of the embedded plate by the diameter of a grouting opening of the embedded plate being 35cm, and performing press polish treatment on the concrete pouring vibration holes and the exhaust holes of the positioned embedded plate for flattening by a spatula 50-70min after grouting, preferably 60min after grouting;
and S216, after the grouting material is poured, positioning the horizontal position and the elevation of the embedded plate, and performing levelness retest.
Further, the method comprises the following steps after the vibration isolation cushion is installed:
s310, retesting the installation accuracy;
and S320, installing anchor bars.
In another embodiment of the present invention, as shown in fig. 3, a method for installing and constructing an LNG storage tank seismic isolation pad includes the steps of: according to the size and the distance of the embedded bolts of the shock insulation rubber support, a set of preformed hole positioning tool is prefabricated, and the tool consists of a double-layer connected circular ring positioning steel plate and an embedded corrugated pipe 9 which penetrates downwards. Adopt cavity stand 5 to connect between the two-layer ring steel sheet, cavity stand 5 internal diameter equals the round hole diameter, and quantity is unanimous with individual layer ring steel sheet round hole quantity, and the position coincides with the round hole of upper and lower two-layer ring steel sheet for effectively guarantee the straightness that hangs down of bellows 9. And a transverse bolt 7 is fixed beside each round hole of the upper-layer circular steel plate and used for fixing the corrugated pipe 9. And the lower annular steel plate is used for fixing the preformed hole die and the pile foundation concrete pouring template. The bottom of the metal corrugated pipe 9 is sealed to prevent concrete from entering the pipe. Before concrete pouring, the corrugated pipe 9 with the inner diameter equal to the diameter of the prepared hole penetrates through the hollow upright post 5 and is screwed and fixed by the transverse bolt 7. The downward-extending length of the corrugated pipe 9 is determined by the depth of the reserved hole, and the lower end of the corrugated pipe 9 is plugged to prevent concrete from entering. And then pouring concrete to the elevation of the top surface of the designed pile foundation, and embedding the corrugated pipe 9 in the concrete. And (3) after the concrete is initially set, detaching the preformed hole remaining mould, and cutting off the exposed corrugated pipe 9 to enable the top end of the corrugated pipe 9 to be flush with the top surface of the pile foundation.
And after the concrete curing period is over, chiseling the concrete on the top surface of the pile foundation. And then, drilling three holes on the top surface of the pile foundation, and respectively driving three expansion bolts into the three holes to serve as supports for fixing the rubber shock insulation cushion embedded plate. The three holes are uniformly distributed along the circumference of the top surface of the pile foundation, the diameter and the depth of the holes are determined according to the type of the expansion bolts, the height of the expansion bolts exposed out of the top surface of the pile foundation is determined by the designed elevation of the pre-buried plate of the shock insulation cushion, and the expansion bolts can be loosened and tightened by nuts to finely adjust the exposed height of the expansion bolts, so that the elevation and the levelness of the pre-buried plate of the shock insulation cushion can be accurately adjusted. And then aligning the pre-embedded bolt of the shock insulation cushion with the reserved hole, placing the pre-embedded plate of the shock insulation cushion on the expansion bolt, adjusting the vertical elevation, the horizontal centering and the levelness of the pre-embedded plate of the shock insulation cushion, and fixing the top of the expansion bolt and the lower bottom surface of the pre-embedded plate of the shock insulation cushion by spot welding to prevent the pre-embedded plate of the shock insulation cushion from shifting. According to the grouting material pouring test result, the diameter of the grouting opening of the embedded plate is preferably controlled to be 35cm, the exhaust holes of the embedded plate are uniformly distributed, and the area ratio of the exhaust holes is not preferably lower than 6.8%.
The grouting material template is made of rectangular sheet iron. Two ends of the rectangular sheet iron are provided with two angle steels which are fixed by rivets. The length of the rectangular sheet iron is 20cm larger than the perimeter of the pile foundation, and the width of the rectangular sheet iron is 20cm larger than the pouring thickness of the grouting material. And respectively drilling two holes on one surface of each angle steel, which is perpendicular to the sheet iron, winding the sheet iron on the top of the pile foundation, penetrating the holes in the angle steel by using two bolts, and screwing the bolts to fix the sheet iron on the top of the pile foundation.
The grouting material is preferably high-fluidity and small-shrinkage grouting material. The grouting material is preferably selected from class III, the grouting material entering a field is required to be inspected, and the inspection and acceptance contents are quality certification documents such as inspection reports, use instructions, field inspection reports (or product quality certificates) and the like. And (4) rechecking the grouting material after entering the field, wherein rechecking items comprise performance and net content, and the grouting material can be used for construction after being qualified.
The grouting material has the technical requirements that:
(1) the fluidity is more than or equal to 270mm and is not more than 320 mm;
(2) no shrinkage and no bleeding.
(3) The expansion rate is less than 1 percent, and the content of chloride ions meets the national standard requirement.
(4) The 28-day compressive strength is more than or equal to 70MPa, and the tensile strength is more than or equal to that of concrete.
The grouting material is prepared by adopting a stirrer to stir the grouting material, and the water addition amount is generally carried out according to the mixing ratio provided by a grouting material manufacturer. The mixing water should adopt drinking water, and when other water sources are used, the mixing water should meet the regulations of the existing technical Specification for application of cement-based grouting materials (GB/T50488). The stirring place should be close to the grouting construction place, and the stirring amount should be determined according to the use amount each time, so as to ensure that the stirring material is used up within 30 minutes. During winter construction, the use of the cement-based grouting material and the mixing water should meet the relevant regulations of the existing acceptance and approval standard for construction quality of concrete structural engineering (GB 50204). Heating the grouting material to room temperature or heating the stirring water (not more than 60 ℃) to ensure that the mold-entering temperature of the stirred grouting material is not lower than 5 ℃.
And after grouting is started, the grouting must be continuously carried out without interruption until the liquid level of the grouting material is flush with the pre-buried plate of the shock insulation cushion. The pouring time is controlled to be 3min, the time for repeatedly pushing the booster is controlled to be 2min, the diameter of a grouting opening of the embedded plate is controlled to be 35cm, the number of exhaust holes of the embedded plate is increased to 24, and the area of the exhaust holes is increased to 6.8% from the original 3.6%. After grouting is finished, the concrete pouring vibration holes and the exhaust holes of the positioning embedded plate are polished to be smooth by using a spatula about one hour after grouting is finished, and unevenness is not allowed to exist, so that the support can be conveniently installed and fixed. And (5) making grouting material pouring records, wherein the grouting material pouring records comprise the starting time and the ending time of grouting material pouring, the grouting material pouring temperature, the pouring amount and the like.
After grouting, retesting the central plane position of the support, the levelness and the elevation of the top surface, recording and checking, and immediately correcting if the support moves.
After grouting, immediately covering a wet grass bag or rock wool quilt after the grouting material is initially set under the normal temperature condition, and carrying out moisture preservation and maintenance for 3-7 days; during winter construction, water can not be added for maintenance, after filling, the folded surface is smoothed, a plastic film is immediately adopted for tightly covering and wrapping, and then the rock wool quilt is covered until the strength of the grouting material meets 50% of the designed strength. After grouting, the grouting material can not be vibrated for 4-36 hours, so that the unhardened grouting layer is prevented from being damaged. During winter construction, the maintenance measures should be in line with the current situation
The method is related to the regulation of the acceptance Standard of construction quality of concrete Structure engineering (GB 50204-2015).
As shown in fig. 4, the invention further provides a preformed hole positioning tool, which consists of a double-layer connected circular ring positioning steel plate and a downward-penetrating corrugated pipe 9, wherein a plurality of circular holes are formed in the circular ring positioning steel plate, and specifically, the number, the size and the spacing of the circular holes are determined according to the number, the size and the spacing of embedded bolts of the seismic isolation rubber support; and the two layers of circular ring positioning steel plates are connected by adopting a hollow upright post 5.
Further, the inner diameter of the hollow upright post 5 is equal to the diameter of the round holes, the number of the hollow upright posts 5 is consistent with the number of the round holes formed in the single-layer circular ring positioning steel plate, and the positions of the hollow upright posts 5 are coincided with the round holes in the upper and lower layers of circular ring positioning steel plates so as to effectively ensure the verticality of the corrugated pipe.
Furthermore, a transverse bolt 7 is fixed beside each round hole on the upper-layer circular ring positioning steel plate 6 and used for fixing the corrugated pipe 9, and a lower-layer circular ring positioning steel plate 8 is used for fixing the preformed hole positioning tool and the pile foundation concrete pouring template.
The invention develops a preformed hole construction positioning tool, the tool structure comprises an upper layer of circular steel plate, a lower layer of circular steel plate, a hollow upright post 5, a transverse positioning fine adjustment bolt and the like, the preformed hole position is arranged on the circular steel plate, the upper layer of circular steel plate and the lower layer of circular steel plate are connected by the hollow upright post 5, and an embedded pipe in the preformed hole is fixed by the transverse positioning fine adjustment bolt; uniformly adding exhaust holes with different sizes on the pre-embedded plate of the shock insulation cushion, and increasing the area ratio of the exhaust holes from 3.6 percent to 6.8 percent; the control standards that the pouring time of the grouting material of the single shock insulation pad is preferably 3min, the vibration time is preferably 2min by repeatedly pushing by a booster (a thin steel plate is welded at the end of a round steel, and the upper side and the lower side of the thin steel plate are in a zigzag shape), and the like are provided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The installation and construction method of the shock insulation pad of the LNG storage tank is characterized by comprising the following steps of:
s100, mounting a preformed hole positioning tool: fixing a lower layer circular ring positioning steel plate in the preformed hole positioning tool with the ground pile template;
s200, pouring ground pile concrete: pouring ground pile concrete into the ground pile template to the designed pile foundation top surface elevation to form a pile foundation, wherein the ground pile concrete embeds the corrugated pipe into the ground pile template;
s300, installing a shock insulation pad: the method comprises the steps of installing expansion bolts on the top surface of a pile foundation, aligning pre-embedded bolts of the shock insulation cushion with reserved holes, placing the pre-embedded plates of the shock insulation cushion on the expansion bolts, fixing the tops of the expansion bolts and the lower bottom surfaces of the pre-embedded plates of the shock insulation cushion through spot welding, and installing the shock insulation cushion on the pre-embedded plates of the shock insulation cushion.
2. The LNG storage tank seismic isolation cushion installation and construction method of claim 1, wherein: the method comprises the following steps of:
s001, prefabricating a preformed hole positioning tool according to the number, the size and the spacing of the embedded bolts of the shock insulation rubber support;
s002 filling underground engineering pile, installing ground pile template on the underground engineering pile.
3. The LNG storage tank seismic isolation pad installation construction method as claimed in claim 1, wherein the method comprises the following steps after the positioning tool for the installation of the prepared hole:
s110, mounting a corrugated pipe: and penetrating the corrugated pipe through the hollow upright post in the preformed hole positioning tool, screwing and fixing the corrugated pipe by using a transverse bolt, and plugging the lower end of the corrugated pipe to prevent concrete from entering.
4. The LNG storage tank seismic isolation pad installation construction method as claimed in claim 1, wherein the method comprises the following steps after the ground pile concrete is poured:
s210, preformed hole forming: and when the ground pile concrete is initially set, the preformed hole positioning tool is detached, and the exposed corrugated pipe is cut off, so that the top end of the corrugated pipe is flush with the top surface of the pile foundation, and the preformed hole is formed.
5. The LNG storage tank seismic isolation cushion installation and construction method of claim 1, wherein: the mounting of the shock insulation cushion particularly comprises the following steps:
s301, after the concrete curing period is over, chiseling the concrete on the top surface of the pile foundation, then punching the top surface of the pile foundation, and driving expansion bolts into the holes respectively.
6. The LNG storage tank seismic isolation cushion installation and construction method as claimed in claim 4, wherein: the method comprises the following steps after the preformed hole is formed:
s211, carrying out incoming inspection and acceptance on the shock insulation cushion and the embedded part;
s212, installing lower anchor bars and embedded plates;
s213, installing a grouting material template;
s214, positioning the horizontal position and the elevation of the embedded plate, and checking the levelness;
s215, pouring grouting material into the grouting material template: continuously and uninterruptedly grouting for 3min, repeatedly pushing a booster for 2min, increasing the number of exhaust holes of the embedded plate by the diameter of a grouting opening of the embedded plate being 35cm, and performing press polish treatment on the concrete pouring vibration holes and the exhaust holes of the positioned embedded plate for flattening by a spatula 50-70min after grouting;
and S216, after the grouting material is poured, positioning the horizontal position and the elevation of the embedded plate, and performing levelness retest.
7. The LNG storage tank seismic isolation cushion installation and construction method of claim 1, wherein: the method comprises the following steps after the vibration isolation cushion is installed:
s310, retesting the installation accuracy;
and S320, installing anchor bars.
8. The utility model provides a preformed hole location frock which characterized in that: the preformed hole positioning tool is composed of a double-layer connected circular ring positioning steel plate and a lower-penetrating corrugated pipe, a plurality of circular holes are formed in the circular ring positioning steel plate, and the circular ring positioning steel plate is connected with the circular ring positioning steel plate through hollow stand columns.
9. The preformed hole positioning tool according to claim 8, characterized in that: the inner diameter of the hollow upright posts is equal to the diameter of the round holes, the number of the hollow upright posts is consistent with the number of the round holes formed in the single-layer circular ring positioning steel plate, and the positions of the hollow upright posts are coincided with the round holes in the upper and lower layers of circular ring positioning steel plates.
10. The preformed hole positioning tool according to claim 9, characterized in that: the other horizontal bolt that is fixed with of every round hole on the upper ring location steel sheet for carry out the fixed of bellows, lower floor ring location steel sheet is used for fixing preformed hole location frock and pile foundation concrete placement template.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110165736.4A CN112962682A (en) | 2021-02-06 | 2021-02-06 | Installation and construction method for shock insulation pad of LNG storage tank and preformed hole positioning tool |
Applications Claiming Priority (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703886A (en) * | 2022-04-27 | 2022-07-05 | 浙江国进建设有限公司 | Oil refining irrigation area civil construction method |
| CN115262562A (en) * | 2022-06-02 | 2022-11-01 | 海洋石油工程股份有限公司 | Method for reducing secondary grouting pitted surface rate of embedded plate of seismic isolation support |
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2021
- 2021-02-06 CN CN202110165736.4A patent/CN112962682A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114703886A (en) * | 2022-04-27 | 2022-07-05 | 浙江国进建设有限公司 | Oil refining irrigation area civil construction method |
| CN114703886B (en) * | 2022-04-27 | 2024-05-17 | 浙江国进建设有限公司 | Civil construction method for oil refining tank area |
| CN115262562A (en) * | 2022-06-02 | 2022-11-01 | 海洋石油工程股份有限公司 | Method for reducing secondary grouting pitted surface rate of embedded plate of seismic isolation support |
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