CN113529732B - Circulating pipeline device for LNG gasification conversion and construction method thereof - Google Patents
Circulating pipeline device for LNG gasification conversion and construction method thereof Download PDFInfo
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- CN113529732B CN113529732B CN202110746630.3A CN202110746630A CN113529732B CN 113529732 B CN113529732 B CN 113529732B CN 202110746630 A CN202110746630 A CN 202110746630A CN 113529732 B CN113529732 B CN 113529732B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D27/46—Foundations for supply conduits or other canals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
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- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention relates to a circulating pipeline device for LNG gasification conversion, which comprises a plurality of LNG conveying pipelines and anti-seepage groups arranged on two adjacent LNG conveying pipelines, wherein the LNG conveying pipelines are provided with heat-insulating sleeves, and the anti-seepage groups and the heat-insulating sleeves are sequentially distributed at intervals; the construction method of the circulating pipeline device comprises the following specific steps: s1, selecting an LNG conveying pipeline laying area; s2, pile hole grouting is carried out on the LNG conveying pipeline laying area; s3, excavating a foundation pit and hoisting a foundation pit support structure; s4, laying an LNG conveying pipeline; s5, installing a heat-insulating sleeve and an anti-seepage group. The invention has the following advantages: the seepage-proofing sealing performance of the joint of the circulating pipeline device is effectively guaranteed, the displacement deformation of a soil body in the construction process is avoided, the connection stability of the circulating pipeline device is guaranteed, and the construction safety performance is improved.
Description
The technical field is as follows:
the invention belongs to the field of LNG (liquefied natural gas) gasification conversion, and particularly relates to a circulating pipeline device for LNG gasification conversion and a construction method thereof.
Background art:
LNG is low-temperature liquid at minus 162 ℃, has flammability and diffusivity, and LNG leakage can be caused by the failure of equipment or scrapers for storing and transporting the LNG, so that accidents such as fire disasters and explosions are caused, the personal safety of workers is threatened, the low-temperature danger of the LNG is mainly embodied in that once the LNG leaks, frostbite is caused to a contacted human body, the low temperature of the leaked LNG can cause material shrinkage, further damage to pipelines or equipment is caused, and serious leakage is caused, liquefied natural gas can be immediately evaporated after leaking, mixed gas is formed after being mixed with air, the explosion limit of the mixed gas is 5-15% (V), and explosion is easily caused when a fire source is met, so that the circulating pipeline for LNG gasification and conversion has great difficulty in the construction process.
At present, a circulating pipeline device for LNG gasification conversion is generally placed in a foundation pit excavated in advance, the circulating pipeline device is fixed, the excavation of the foundation pit is an unloading process of a soil body, a displacement field, a stress field and the foundation pit of an adjacent soil body can change due to the unloading of the soil body, the original stress balance of the foundation pit soil body is broken through the excavation of the foundation pit, the soil body is enabled to move laterally, horizontal displacement of the circulating pipeline device towards the inner direction of the foundation pit is inevitably caused, meanwhile, the excavation of a deep foundation pit causes the adjacent ground to sink, the circulating pipeline device is enabled to move vertically, when the vertical displacement and the horizontal displacement reach the deformation limit value of the circulating pipeline device, the vertical and horizontal tension fracture damage of the circulating pipeline device is caused, the joint of the circulating pipeline device is enabled to leak, and great potential safety hazards are generated.
The invention content is as follows:
the invention aims to overcome the defects and provide the circulating pipeline device for LNG gasification conversion and the construction method thereof, so that the anti-seepage sealing performance of the joint of the circulating pipeline device is effectively ensured, the displacement and deformation of a soil body in the construction process are avoided, the connection stability of the circulating pipeline device is ensured, and the construction safety performance is improved.
The purpose of the invention is realized by the following technical scheme: a circulating pipeline device for LNG gasification conversion comprises a plurality of LNG conveying pipelines and anti-seepage groups arranged on two adjacent LNG conveying pipelines, wherein the LNG conveying pipelines are provided with heat-insulating sleeves, and the anti-seepage groups and the heat-insulating sleeves are sequentially distributed at intervals;
the construction method of the circulating pipeline device comprises the following specific steps:
s1, selecting an LNG conveying pipeline laying area: measuring and positioning by adopting a GPS, selecting a laying area of the LNG conveying pipeline, scribing at the laying area of the LNG conveying pipeline, and making a round mark on a place where pre-piling and grouting are performed;
s2, pile hole grouting is carried out on the LNG conveying pipeline laying area: performing pile hole grouting on the circular marked position in the step S1 by adopting a special pile hole grouting device, wherein the special pile hole grouting device comprises a pile body and a lower press for driving the pile body to lift up and down, the lower end of the pile body is provided with a longitudinal drilling grouting assembly for drilling a hole in the ground longitudinally, the pile body is internally provided with an oblique drilling grouting assembly for drilling a hole in the ground obliquely, the pile body is internally provided with a mud collecting assembly, the pile body is longitudinally driven into a mud layer under the action of the lower press, after the pile body is pressed down to a preset position of the mud layer, the longitudinal drilling grouting assembly stops drilling, the oblique drilling grouting assembly performs oblique drilling, oblique grouting is performed after oblique drilling is completed, the longitudinal drilling grouting assembly continues to move upwards until the oblique drilling grouting assembly is contracted into the pile body to form a first oblique grouting body, the longitudinal drilling grouting assembly moves upwards and performs longitudinal grouting, grouting is stopped after the pile body is lifted by a preset distance, the oblique drilling grouting assembly performs oblique drilling grouting again to form a second oblique grouting body, the longitudinal drilling grouting assembly continues to move upwards until the surface of the mud layer, the longitudinal drilling body, the first oblique drilling grouting body, the circular marked position is connected with a plurality of circular marked units, and the circular marked units are formed;
s3, excavating a foundation pit and hoisting a foundation pit support structure: excavating a foundation pit on the inner sides of the grouting units, and pouring concrete in the foundation pit to form a foundation pit enclosure structure, wherein the foundation pit enclosure structure comprises a concrete foundation and a plurality of pipeline brackets arranged on the concrete foundation, the pipeline brackets are distributed along the extension direction of the foundation pit, and the side ends of the concrete foundation are correspondingly and fixedly connected with the grouting units;
s4, laying an LNG conveying pipeline: hoisting two adjacent LNG conveying pipelines to a pipeline bracket, and fixedly sleeving a first expansion rubber sleeve between the two adjacent LNG conveying pipelines through a sealant;
s5, installing a heat-insulating sleeve and an anti-seepage group: and installing a heat-insulating sleeve on the LNG conveying pipelines, and installing an anti-seepage group at the joint of two adjacent LNG conveying pipelines.
The invention further improves the machine that: the longitudinal drilling guniting assembly comprises a cutter disc set and a grouting set which are arranged below the pile body, and further comprises a rotary disc which is rotatably arranged on the inner wall of the pile body, the rotary disc realizes circumferential rotation through a driving motor arranged on the inner wall of the pile body, the cutter disc set is arranged at the lower end of the rotary disc and is coaxially connected with the rotary disc, the grouting set is arranged on the outer side of the lower end of the pile body, the outer wall of the rotary disc is rotatably connected with the inner wall of the pile body through a first bearing, and the cutter disc set is arranged at the lower end of the rotary disc.
The invention further improves the machine that: the cutter disc set comprises a circular cutter disc frame, the circular cutter disc frame comprises a circular ring body and a plurality of cutter disc supporting rods arranged in the circular ring body, the circumferences of the cutter disc supporting rods are distributed in the circular ring body, the centers of the cutter disc supporting rods are fixedly connected with the center of the rotary disc through shaft rods, the outer wall of the circular ring body is rotatably connected with the inner wall of the pile body through a second bearing, a plurality of uniformly distributed blades are arranged at the lower end of each cutter disc supporting rod, and the blades are distributed in an extending mode along the rotating direction of the circular ring body;
grout group establishes the grout sleeve at the pile body outer wall including the cover, has a plurality of whitewashing heads on the grout sleeve, still has the hydrojet head on the grout sleeve, and telescopic inboard and the tourus fixed connection of whitewashing, the gunning head passes through the whitewashing pipe intercommunication with outside grout, and the hydrojet head passes through the hydrojet pipe intercommunication with outside hydrojet, and the grout sleeve rotates whitewashing and rotatory water spray along with the rotation of tourus.
The invention further improves the machine that: slant drilling whitewashing subassembly is including arranging drilling hob and the servo motor in the pile body in, drilling hob slope sets up inside the pile body, and the upper end of drilling hob is connected with the screw rod, servo motor is hung to the screw rod and drives drilling hob reciprocating motion and circular motion under servo motor's drive, the lateral wall of pile body has the perforation that the one end of holding the drilling hob stretches out, the lateral wall of pile body has the gate that covers the perforation near fenestrate position, the gate covers or opens the perforation along with the drive of driving cylinder, drilling hob inside has whitewashing hole and hydrojet hole.
The invention further improves the machine in that: the mud material collecting assembly comprises a mud material collecting box arranged in a pile body, the mud material collecting box is arranged at the lower side position of the drilling screw rod and further comprises a rotating rod and a motor driving the rotating rod to rotate, the external fixedly connected with helical blades of the rotating rod are obliquely arranged in the pile body, the lower end of the rotating rod is close to the rotating disk, a through hole convenient for mud material to move towards the mud material collecting box is formed in the rotating disk, and the lower end of the rotating rod is arranged above the through hole.
The invention further improves the machine that: in the step S2, when the pile body is longitudinally driven into the mud layer under the action of the lower press, the liquid spraying head below the pile body rotationally sprays water from top to bottom along with the descending of the pile body, so that space avoidance of mud materials is realized during pile drilling; when the oblique drilling grouting assembly drills mud layers obliquely, the liquid spraying holes in the drilling screw rods perform oblique rotating water spraying from top to bottom along with the rotating movement of the drilling screw rods, and after oblique drilling is finished, oblique rotating slurry spraying is performed from bottom to top, so that a first oblique grouting body and a second oblique grouting body are formed; when the pile body is grouted from bottom to top, the liquid spraying head of the longitudinal drilling grouting assembly stops spraying liquid, and the slurry spraying head performs longitudinal rotating slurry spraying from bottom to top, so that longitudinal grouting body is formed.
The invention further improves the machine that: the pipeline bracket comprises a support column fixedly arranged on a concrete foundation and a hoop part arranged at the upper end of the support column, the hoop part comprises a lower hoop body fixedly connected with the support column and an upper hoop body arranged above the lower hoop body, a cavity for allowing LNG (liquefied natural gas) conveying pipelines to horizontally penetrate is formed between the upper hoop body and the lower hoop body, one side end of the upper hoop body is movably connected with one side end of the lower hoop body through a hinge, the other side end of the upper hoop body is fixed with the other side end of the lower hoop body through a bolt, and the joints of the upper hoop body and the lower hoop body with the two adjacent LNG conveying pipelines are in anti-seepage connection through an anti-seepage group;
the anti-seepage group comprises clamping blocks which are respectively arranged on the inner walls of the upper clamp body and the lower clamp body, the inner walls of the clamping blocks are tightly attached to the outside of the LNG conveying pipeline, the clamping blocks penetrate through the upper clamp body, the lower clamp body is provided with a screwing screw rod to the corresponding clamping block, the screwing screw rod is in threaded connection with the corresponding upper clamp body and the lower clamp body, the inner wall of each clamping block is provided with a second expansion rubber sleeve, the second expansion rubber sleeve and the clamping blocks are fixed through sealant, the width of the second expansion rubber sleeve is larger than that of the first expansion rubber sleeve, the inner wall of the second expansion rubber sleeve is provided with an annular groove for accommodating the first expansion rubber sleeve, and an expansion water stop strip is arranged between the side edge of the upper clamp body and the LNG conveying pipeline.
The invention further improves the machine in that: in the step S5, LNG conveying pipelines are placed on the pipeline bracket, the joint of two adjacent LNG conveying pipelines is placed between the upper clamp body and the lower clamp body, the first expansion rubber sleeve and the second expansion rubber sleeve correspond to each other, the upper clamp body and the lower clamp body are screwed and fixed through bolts, the screwing screw rod is rotated to enable the second expansion rubber sleeve and the first expansion rubber sleeve on the inner wall of the clamping block to be mutually embedded to achieve sealing and buffering, and finally the expansion water stop strip is installed.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, pile-driving hole grouting is carried out on the LNG conveying pipeline laying area before foundation pit excavation to form a plurality of mutually connected grouting units, so that a strong and powerful soil body structure is provided for foundation pit excavation, deformation of the surrounding foundation soil body is avoided, a stable foundation is provided for subsequent laying of the LNG circulating pipeline, the LNG circulating pipeline is prevented from influencing the connection strength of the LNG circulating pipeline due to lateral movement of the soil body during deformation, and the anti-seepage sealing performance of the LNG circulating pipeline is ensured.
2. The invention adopts a special pile hole grouting device to perform grouting treatment on a mud layer, and finally forms a grouting structure formed by connecting a plurality of grouting units, wherein each grouting unit comprises a first oblique grouting body, a second oblique grouting body and a longitudinal grouting body, and the plurality of grouting units which are connected with each other are arranged around the foundation pit, so that the supporting strength of the foundation pit is further improved, the sinking of the adjacent ground is avoided, the stability of the foundation pit enclosure structure in the foundation pit is ensured, and the stability of the LNG circulating pipeline device is ensured.
3. The special pile hole grouting device is used for drilling a pile hole in a mud layer from top to bottom by the aid of the rotating cutter head group during pile driving, a liquid spraying head is used for spraying water in a rotating mode in the process of downwards drilling the pile hole to provide an effective avoiding space for the pile hole in the mud layer, meanwhile, the mud layer around the pile hole is loosened to facilitate pile drilling, then pile drilling and grouting treatment of first oblique grouting body are carried out, after the first oblique grouting body is completed, the oblique drilling and grouting assembly stretches into the pile body, longitudinal rotating grouting is carried out on the pile body from bottom to top, after longitudinal rotating grouting is carried out for a certain distance, pile drilling and grouting treatment of second oblique grouting body are carried out, after the second oblique drilling and grouting assembly stretches into the pile body, at the moment, the pile body continues longitudinal rotating grouting from bottom to top to form longitudinal grouting, a longitudinal grouting body is formed, a plurality of grouting units can be completed through single operation, and a plurality of grouting units can be continuously carried out for a plurality of times, longitudinal pile driving and oblique pile driving operation is realized, the structure of the grouting units greatly improves the integral grouting area, and the strength of a foundation pit is greatly improved.
4. The blades on the cutter head supporting rod rotate along with the rotation of the rotary table in the longitudinal pile driving hole process, so that cutting pile driving on a mud layer is facilitated, mud in the mud layer is collected by the mud collecting assembly and conveyed outwards, and the mud layer structure is prevented from being influenced by extrusion of the mud to the periphery in the pile driving process.
Description of the drawings:
fig. 1 is a schematic structural view of a pile driving hole grouting device specially used in step S2 of the present invention in a mud layer.
Fig. 2 is a schematic structural diagram of a plurality of grouting units formed after step S2 of the present invention is completed.
Fig. 3 is a schematic view showing the internal structure of the pile driving hole grouting apparatus for exclusive use in fig. 1.
Fig. 4 is a schematic structural view of the longitudinal drilling guniting assembly in fig. 3.
FIG. 5 is a top view of the construction of the disk stack of FIG. 4.
Fig. 6 is a schematic structural diagram of the heat-insulating sleeve and the impermeable group after the installation in step S5 of the present invention.
Fig. 7 is a cross-sectional view of the LNG transfer pipeline of the present invention within a foundation pit.
Fig. 8 is a schematic view of the structure of the impermeable group in fig. 7.
The reference numbers in the figures:
1-LNG conveying pipeline, 2-seepage-proofing group, 3-heat-insulating sleeve, 4-piling hole grouting device, 5-concrete foundation, 6-pipeline bracket, 7-first expansion rubber sleeve and 8-foundation pit;
21-a clamping block, 22-a tightening screw, 23-a second expansion rubber sleeve, 24-a ring groove and 25-an expansion water stop strip;
41-pile body, 43-longitudinal drilling guniting component, 44-oblique drilling guniting component, 45-mud collecting component, 46-first oblique grouting body, 47-second oblique grouting body, 48-longitudinal grouting body and 49-grouting unit;
431-cutter disc group, 432-grouting group, 433-rotary disc, 434-driving motor, 435-first bearing, 4311-circular ring body, 4312-cutter disc supporting rod, 4313-shaft rod, 4314-second bearing and 4315-cutter blade; 4321-guniting sleeve, 4322-guniting head, 4323-liquid-spraying head;
441-drilling screw rod, 442-servo motor, 443-screw rod, 444-perforation, 445-gate, 446-driving cylinder, 447-guniting hole and 448-liquid-spraying hole;
451-pug collecting box, 452-screw, 453-motor, 454-helical blade, 455-through hole;
61-support column, 62-clamp member, 621-upper clamp body, 622-lower clamp body, 623-bolt.
The specific implementation mode is as follows:
for the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
In the description of the present invention, it should be understood that the terms indicating an orientation or positional relationship, such as that shown based on the drawings, are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the structure or element being referred to must have a particular orientation, and therefore, are not to be construed as limiting the present invention.
In the present invention, unless otherwise specified and limited, terms such as "connected," "provided," "having," and the like are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, or directly connected, and may be connected through an intermediate medium, so that those skilled in the art can understand the basic meaning of the above terms in the present invention according to specific situations.
The invention relates to a circulating pipeline device for LNG gasification conversion, which comprises a plurality of LNG conveying pipelines 1 and anti-seepage groups 2 arranged on two adjacent LNG conveying pipelines 1, wherein the LNG conveying pipelines 1 are provided with heat-insulating sleeves 3, and the anti-seepage groups 2 and the heat-insulating sleeves 3 are sequentially distributed at intervals;
the construction method of the circulating pipeline device comprises the following specific steps:
s1, selecting an LNG conveying pipeline laying area: measuring and positioning by adopting a GPS, selecting a laying area of the LNG conveying pipeline 1, marking the laying area of the LNG conveying pipeline 1, and marking a round mark on a position where pile grouting is performed in advance;
s2, pile hole grouting is carried out on the LNG conveying pipeline laying area: as shown in fig. 1, performing pile hole grouting on the circular marked position in step S1 by using a special pile hole grouting device 4, wherein the special pile hole grouting device 4 comprises a pile body 41 and a down-press machine for driving the pile body 41 to ascend and descend, the lower end of the pile body 41 is provided with a longitudinal drilling grouting assembly 43 for longitudinally drilling the ground, the pile body 41 is internally provided with an oblique drilling grouting assembly 44 for obliquely drilling the ground, the pile body 41 is internally provided with a mud collecting assembly 45, the pile body 41 is longitudinally driven into a mud layer under the action of the down-press machine, when the pile body 41 is pressed down to a preset position of the mud layer, the longitudinal drilling grouting assembly 43 temporarily stops drilling, the oblique drilling grouting assembly 44 performs oblique drilling, oblique grouting is performed after oblique drilling is completed, until the oblique drilling grouting assembly 44 contracts into the pile body 41 to form a first oblique grouting body 46, the longitudinal drilling grouting assembly 43 moves upwards and performs longitudinal grouting, grouting is stopped after ascending for a preset distance, the oblique drilling assembly 44 performs drilling again to form a second oblique grouting body 47, the longitudinal drilling grouting assembly 43 moves upwards, and a plurality of grouting units are continuously formed, and a plurality of grouting units are connected to the oblique drilling unit in a form as shown in a circular grouting form, and a longitudinal grouting unit 48;
s3, excavating a foundation pit and hoisting a foundation pit support structure: as shown in fig. 6, a foundation pit 8 is excavated inside the grouting units 49, and concrete is poured in the foundation pit 8, so as to form a foundation pit enclosure structure, where the foundation pit enclosure structure includes a concrete foundation 5 and a plurality of pipeline brackets 6 disposed on the concrete foundation 5, the pipeline brackets 6 are distributed along the extension direction of the foundation pit 8, and the side ends of the concrete foundation 5 are correspondingly and fixedly connected with the grouting units 49;
s4, laying an LNG conveying pipeline: hoisting two adjacent LNG conveying pipelines 1 to a pipeline bracket 6, and fixedly sleeving a first expansion rubber sleeve 7 between the two adjacent LNG conveying pipelines 1 through a sealant;
s5, installing a heat-insulating sleeve and an anti-seepage group: the LNG conveying pipelines 1 are provided with heat-insulating sleeves 3, and the anti-seepage group 2 is arranged at the joint of the two adjacent LNG conveying pipelines 1.
According to the invention, pile hole grouting is carried out on the laying area of the LNG conveying pipeline 1 before the foundation pit 8 is excavated to form a plurality of mutually connected grouting units 49, so that a strong soil body structure is provided for the excavation of the foundation pit 1, the deformation of the soil body of the surrounding foundation is avoided, a stable foundation is provided for the subsequent laying of the LNG circulating pipeline 1, the influence of the LNG circulating pipeline 1 on the connection strength due to the deformation and the lateral movement of the soil body caused by the LNG circulating pipeline 1 is avoided, and the anti-seepage sealing performance of the LNG circulating pipeline 1 is ensured.
The invention adopts the special pile driving hole grouting device 4 to perform grouting treatment on the mud layer, and finally forms a grouting structure which is formed by connecting a plurality of grouting units 49, wherein each grouting unit 49 comprises a first oblique grouting body 46, a second oblique grouting body 47 and a longitudinal grouting body 48, the plurality of grouting units 49 which are connected with each other are arranged around the foundation pit 1, the supporting strength of the foundation pit 1 is further improved, the sinking of the adjacent ground is avoided, the stability of the foundation pit enclosure structure in the foundation pit 1 is ensured, and the stability of the LNG circulating pipeline device is ensured.
Further, as shown in fig. 3 and 4, the longitudinal drilling and guniting assembly 43 includes a cutter disc group 431 and a grouting group 432 which are disposed below the pile body 41, and further includes a rotating disc 433 which is rotatably disposed on the inner wall of the pile body 41, the rotating disc 433 is driven by a driving motor 434 disposed on the inner wall of the pile body 41 to rotate circumferentially, the cutter disc group 431 is disposed at the lower end of the rotating disc 433 and is coaxially connected with the rotating disc 433, the grouting group 432 is disposed at the outer side of the lower end of the pile body 41, the outer wall of the rotating disc 433 is rotatably connected with the inner wall of the pile body 41 through a first bearing 435, and the cutter disc group 431 is disposed at the lower end of the rotating disc 433.
Further, as shown in fig. 5, the cutter head set 431 includes a circular cutter head frame, the circular cutter head frame includes a circular ring 4311 and a plurality of cutter head support rods 4312 disposed in the circular ring 4311, the plurality of cutter head support rods 4312 are circumferentially distributed in the circular ring 4311, centers of the plurality of cutter head support rods 4312 are fixedly connected with the center of the rotary disc 433 through a shaft 4313, an outer wall of the circular ring 4311 is rotatably connected with an inner wall of the pile 41 through a second bearing 4314, a plurality of uniformly distributed blades 4315 are disposed at a lower end of the cutter head support rod 4312, and the blades 4315 extend and are distributed along a rotation direction of the circular ring 4311;
the grouting group 432 comprises a guniting sleeve 4321 sleeved on the outer wall of the pile body 41, the guniting sleeve 4321 is provided with a plurality of guniting heads 4322, the guniting sleeve 4321 is further provided with a liquid spraying head 4323, the inner side of the guniting sleeve 4321 is fixedly connected with a ring body 4311, the guniting heads 4322 are communicated with external grouting through guniting pipes, the liquid spraying heads 4323 are communicated with external spraying liquid through liquid spraying pipes, and the guniting sleeve 4321 rotates to perform rotary guniting and rotary water spraying along with the rotation of the ring body 4311.
The special pile driving hole grouting device 4 is used for driving a pile hole in a mud layer from top to bottom by the rotary cutter disc group 431 during pile driving, the liquid spraying head 4323 rotationally sprays water in the downward pile driving process to provide an effective avoiding space for the pile hole in the mud layer, and meanwhile, the mud layer around the pile hole is loosened to facilitate pile driving, then pile driving and grouting treatment of the first oblique grouting body 46 are carried out, after the first oblique grouting body 46 is completed, the oblique drilling and grouting component 44 extends into the pile body 41, longitudinal rotating grouting is carried out on the pile body 41 from bottom to top, after longitudinal rotating for a certain distance, pile driving and grouting treatment of the second oblique grouting body 47 are carried out, after the second oblique grouting body 47 is completed, the oblique drilling and grouting component 44 extends into the pile body 41, at the moment, the pile body 41 continues longitudinal rotating grouting from bottom to top, so that a longitudinal grouting body 48 is formed, the pile driving hole grouting device 4 can complete the pile driving unit 49 in a single operation, a plurality of pile driving units 49 can be continuously completed for a plurality of times, longitudinal and integral grouting units 49 can be realized, and the grouting area of the soil body 1 of the foundation pit can be greatly improved.
Further, the slant drilling guniting assembly 44 includes a drilling screw rod 441 and a servo motor 442 disposed in the pile body 41, the drilling screw rod 441 is disposed in the pile body 41 in an inclined manner, a screw 443 is connected to an upper end of the drilling screw rod 441, the screw 443 is hooked on the servo motor 442 and drives the drilling screw rod 441 to move in a reciprocating manner and to move in a circular manner under the driving of the servo motor 442, a through hole 444 allowing one end of the drilling screw rod 441 to protrude is formed in a side wall of the pile body 41, a gate 445 for covering the through hole 444 is disposed at a position of the side wall of the pile body 41 close to the through hole 444, the gate 445 covers or opens the through hole 444 under the driving of a driving cylinder 446, and a guniting hole 447 and a liquid spraying hole 448 are disposed in the drilling screw rod 441.
Further, the pug collecting assembly 45 comprises a pug collecting box 451 arranged in the pile body 41, the pug collecting box 451 is arranged at the lower side position of the drilling screw rod 441, the pug collecting box 451 further comprises a rotating rod 452 and a motor 453 driving the rotating rod 452 to rotate, a helical blade 454 is fixedly connected to the outer portion of the rotating rod 452, the rotating rod 452 is obliquely arranged in the pile body 41, the lower end of the rotating rod 452 is arranged close to the rotating disc 433, a through hole 455 facilitating movement of pug to the pug collecting box 451 is formed in the rotating disc 433, and the lower end of the rotating rod 452 is arranged at the position above the through hole 455.
The pug passes through the space between the cutter head support rods 4312 under the action of the blades and is gathered at the through hole 455 of the rotating disc 433, and the pug is conveyed into the pug collecting box 451 along with the spiral grooves between the spiral blades 454 due to the rotation of the spiral blades 454 along with the rotating rod 452, so that the pug is collected.
Further, in step S2, when the pile body 41 is driven into the mud layer longitudinally under the action of the pressing machine, the liquid spraying head 4323 below the pile body 41 sprays water in a rotating manner from top to bottom along with the descending of the pile body 41, so that space avoidance of mud is realized during pile hole drilling; when the slant drilling and grouting assembly 44 drills mud layers slantly, the liquid spraying holes 448 in the drilling screw 441 spray water slantly and rotatably from top to bottom along with the rotary movement of the drilling screw 441, and after the slant drilling is finished, the liquid spraying holes are sprayed with liquid slantly and rotatably from bottom to top, so that a first slant grouting body 46 and a second slant grouting body 47 are formed; when the pile body 41 is grouted from bottom to top, the liquid spraying head 4323 of the longitudinal drilling and grouting assembly 43 stops spraying liquid, and the guniting head 4322 performs longitudinal rotating guniting from bottom to top, so that longitudinal grouting body 48 is formed.
Further, as shown in fig. 7 and 8, the pipeline bracket 6 includes a support pillar 61 fixedly disposed on the concrete foundation 5 and a clamp member 62 disposed at an upper end of the support pillar 61, the clamp member 62 includes a lower clamp body 62 fixedly connected to the support pillar 61 and an upper clamp body 621 disposed above the lower clamp body 622, a cavity for horizontally penetrating the LNG transfer pipeline 1 is formed between the upper clamp body 621 and the lower clamp body 622, one side end of the upper clamp body 621 is movably connected to one side end of the lower clamp body 622 through a hinge, the other side end of the upper clamp body 621 is fixed to the other side end of the lower clamp body 622 through a bolt 623, and the upper clamp body 621, the lower clamp body 622 and the joint of two adjacent LNG transfer pipelines 1 are connected in an anti-seepage manner through an anti-seepage set 2;
the anti-seepage group 2 comprises clamping blocks 21 which are respectively arranged on the inner walls of an upper clamping ring body 621 and a lower clamping ring body 622, the inner walls of the clamping blocks 21 are tightly attached to the outside of the LNG conveying pipeline 1, the clamping blocks penetrate through the upper clamping ring body 621, the lower clamping ring body 622 and the corresponding clamping blocks 21 are provided with tightening screws 22, the tightening screws 22 are in threaded connection with the corresponding upper clamping ring body 621 and the corresponding lower clamping ring body 622, the inner wall of the clamping block 21 is provided with a second expansion rubber sleeve 23, the second expansion rubber sleeve 23 is fixed with the clamping blocks 21 through sealant, the width of the second expansion rubber sleeve 23 is larger than that of the first expansion rubber sleeve 7, the inner wall of the second expansion rubber sleeve 23 is provided with a ring groove 24 for accommodating the first expansion rubber sleeve 7 to be embedded, and an expansion water stop strip 25 is arranged between the side edge of the upper clamping ring body 621 and the lower clamping ring body 622 and the LNG conveying pipeline 1.
Further, in step S5, the LNG transfer pipelines 1 are placed on the pipeline bracket 6, the joint of two adjacent LNG transfer pipelines 1 is placed between the upper clamp body 621 and the lower clamp body 622, the first expansion rubber sleeve 7 and the second expansion rubber sleeve 23 are corresponded to each other, the upper clamp body 621 and the lower clamp body 622 are screwed and fixed by the bolt 623, the screwing screw 22 is rotated to enable the second expansion rubber sleeve 23 and the first expansion rubber sleeve 7 on the inner wall of the clamping block 21 to be embedded with each other to achieve sealing and buffering, and finally the expansion water stop strip 25 is installed.
The joint of adjacent LNG pipeline 1 realizes preliminary sealing connection through sealed fixed first inflation gum cover 7 of gluing, the clamp piece 62 that can open and shut passes through the locking of bolt 623 behind the junction cladding of LNG pipeline 1 to and a plurality of tightening screw rods 22 are tight to the top of clamp block 21, make the mutual gomphosis of second inflation gum cover 23 and first inflation gum cover 7 of clamp block 21 inner wall, further improved sealed prevention of seepage effect, be convenient for simultaneously realize dismantling the installation of LNG pipeline 1.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A circulating pipeline device for LNG gasification conversion and a construction method thereof are characterized in that: the circulating pipeline device comprises a plurality of LNG (liquefied natural gas) conveying pipelines and anti-seepage groups arranged on two adjacent LNG conveying pipelines, wherein the LNG conveying pipelines are provided with heat-insulating sleeves, and the anti-seepage groups and the heat-insulating sleeves are sequentially distributed at intervals;
the construction method of the circulating pipeline device comprises the following specific steps:
s1, selecting an LNG conveying pipeline laying area: measuring and positioning by adopting a GPS, selecting an LNG conveying pipeline laying area, marking a line at the LNG conveying pipeline laying area, and marking a round mark on a position where pile pre-driving grouting is performed;
s2, pile hole grouting is carried out on the LNG conveying pipeline laying area: performing pile hole grouting on the circular mark position in the step S1 by using a special pile hole grouting device, wherein the special pile hole grouting device comprises a pile body and a pressing machine for driving the pile body to lift up and down, the lower end of the pile body is provided with a longitudinal drilling grouting component for drilling holes longitudinally in the ground, the pile body is internally provided with an oblique drilling grouting component for drilling holes obliquely in the ground, the pile body is internally provided with a mud collecting component, the pile body is longitudinally driven into a mud layer under the action of the pressing machine, after the pile body is pressed down to a preset position of the mud layer, the longitudinal drilling grouting component stops drilling, the oblique drilling grouting component performs oblique drilling, oblique grouting is performed after oblique drilling is completed, the oblique drilling grouting component retracts into the pile body to form a first oblique grouting body, the longitudinal drilling grouting component moves upwards and performs longitudinal grouting, grouting is stopped after the pile body rises for a preset distance, the oblique drilling grouting component performs oblique drilling and grouting again to form a second oblique grouting body, the longitudinal drilling grouting component continues to move upwards, grouting is performed to the surface of the mud layer, the second oblique drilling grouting body, and the circular grouting unit is connected with a plurality of circular grouting units;
the longitudinal drilling and guniting assembly comprises a cutter disc set and a grouting set which are arranged below the pile body, and further comprises a rotary disc which is rotatably arranged on the inner wall of the pile body, the rotary disc realizes circumferential rotation through a driving motor arranged on the inner wall of the pile body, the cutter disc set is arranged at the lower end of the rotary disc and is coaxially connected with the rotary disc, the grouting set is arranged on the outer side of the lower end of the pile body, the outer wall of the rotary disc is rotatably connected with the inner wall of the pile body through a first bearing, and the cutter disc set is arranged at the lower end of the rotary disc; the cutter disc set comprises a circular cutter disc frame, the circular cutter disc frame comprises a circular ring body and a plurality of cutter disc supporting rods arranged in the circular ring body, the plurality of cutter disc supporting rods are distributed in the circular ring body in an equal circumference mode, the centers of the plurality of cutter disc supporting rods are fixedly connected with the center of the rotary disc through shaft rods, the outer wall of the circular ring body is rotatably connected with the inner wall of the pile body through a second bearing, a plurality of uniformly distributed blades are arranged at the lower end of each cutter disc supporting rod, and the blades extend and are distributed along the rotating direction of the circular ring body; the grouting group comprises a grouting sleeve sleeved on the outer wall of the pile body, the grouting sleeve is provided with a plurality of grouting heads, the grouting sleeve is also provided with a liquid spraying head, the inner side of the grouting sleeve is fixedly connected with the annular body, the grouting heads are communicated with external grouting through a grouting pipe, the liquid spraying heads are communicated with external sprayed liquid through a liquid spraying pipe, and the grouting sleeve rotates to perform rotary grouting and rotary water spraying along with the rotation of the annular body;
the inclined drilling guniting assembly comprises a drilling screw rod and a servo motor, wherein the drilling screw rod is arranged in a pile body in an inclined mode, the upper end of the drilling screw rod is connected with a screw rod, the screw rod is hung through the servo motor and drives the drilling screw rod to move in a reciprocating mode and move in a circular mode under the driving of the servo motor, a through hole which is used for accommodating one end of the drilling screw rod to extend out is formed in the side wall of the pile body, a gate which is used for covering the through hole is arranged at the position, close to the through hole, of the side wall of the pile body, the gate is used for covering or opening the through hole along with the driving of a driving cylinder, and a guniting hole and a liquid spraying hole are formed in the drilling screw rod;
s3, excavating a foundation pit and hoisting a foundation pit support structure: excavating a foundation pit on the inner sides of the grouting units, and pouring concrete in the foundation pit to form a foundation pit enclosure structure, wherein the foundation pit enclosure structure comprises a concrete foundation and a plurality of pipeline brackets arranged on the concrete foundation, the pipeline brackets are distributed along the extension direction of the foundation pit, and the side ends of the concrete foundation are correspondingly and fixedly connected with the grouting units;
s4, laying an LNG conveying pipeline: hoisting two adjacent LNG conveying pipelines to a pipeline bracket, and fixedly sleeving a first expansion rubber sleeve between the two adjacent LNG conveying pipelines through a sealant;
s5, installing a heat-insulating sleeve and an anti-seepage group: and a heat-insulating sleeve is arranged on the LNG conveying pipeline, and an anti-seepage group is arranged at the joint of two adjacent LNG conveying pipelines.
2. The circulation pipeline device for LNG gasification conversion and the construction method thereof according to claim 1, wherein: the mud material collecting assembly comprises a mud material collecting box arranged in a pile body, the mud material collecting box is arranged at the lower side position of the drilling screw rod and further comprises a rotating rod and a motor driving the rotating rod to rotate, the external fixedly connected with helical blades of the rotating rod are obliquely arranged in the pile body, the lower end of the rotating rod is close to the turntable, a through hole convenient for mud material to move to the mud material collecting box is formed in the turntable, and the lower end of the rotating rod is arranged above the through hole.
3. The circulation pipeline device for LNG gasification conversion and the construction method thereof according to claim 2, wherein: in the step S2, when the pile body is longitudinally driven into the mud layer under the action of the lower press, the liquid spraying head below the pile body rotationally sprays water from top to bottom along with the descending of the pile body, so that space avoidance of mud materials is realized during pile drilling; when the oblique drilling grouting assembly drills mud layers obliquely, the liquid spraying holes in the drilling screw rods perform oblique rotating water spraying from top to bottom along with the rotating movement of the drilling screw rods, and after oblique drilling is finished, oblique rotating slurry spraying is performed from bottom to top, so that a first oblique grouting body and a second oblique grouting body are formed; and when the pile body is grouted from bottom to top, the liquid spraying head of the longitudinal drilling and grouting assembly stops spraying liquid, and the slurry spraying head performs longitudinal rotating slurry spraying from bottom to top, so that longitudinal grouting body is formed.
4. The circulation pipeline apparatus for LNG gasification conversion and the construction method thereof according to any one of claims 1 to 3, wherein: the pipeline bracket comprises a support column fixedly arranged on a concrete foundation and a clamp part arranged at the upper end of the support column, the clamp part comprises a lower clamp body fixedly connected with the support column and an upper clamp body arranged above the lower clamp body, a cavity for horizontally penetrating an LNG conveying pipeline is formed between the upper clamp body and the lower clamp body, one side end of the upper clamp body is movably connected with one side end of the lower clamp body through a hinge, the other side end of the upper clamp body is fixed with the other side end of the lower clamp body through a bolt, and the upper clamp body, the lower clamp body and the joint of two adjacent LNG conveying pipelines are in anti-seepage connection through an anti-seepage group;
the prevention of seepage group is including arranging the tight piece of clamp of last clamp body and lower clamp body inner wall in respectively, the inner wall of pressing from both sides tight piece is hugged closely with LNG pipeline's outside, runs through the tight piece of clamp body, the tight piece of clamp body has the screw rod of screwing up to the tight piece that presss from both sides that corresponds down, screw rod and the last clamp body that corresponds, the lower clamp body of pressing from both sides tight piece are threaded connection, the inner wall that presss from both sides tight piece has second inflation gum cover, second inflation gum cover is fixed through sealed glue realization with pressing from both sides tight piece, the width of second inflation gum cover is greater than first inflation gum cover, just the inner wall of second inflation gum cover has the annular that holds first inflation gum cover embedding, it has the inflation sealing strip to go up between the side reason of the clamp body, the lower clamp body and the LNG pipeline.
5. The circulation pipeline for LNG gasification conversion and the construction method thereof according to claim 4, wherein: in the step S5, the LNG conveying pipelines are placed on the pipeline bracket, the joint of two adjacent LNG conveying pipelines is arranged between the upper clamp body and the lower clamp body, the first expansion rubber sleeve and the second expansion rubber sleeve correspond to each other, the upper clamp body and the lower clamp body are screwed and fixed through bolts, the screwing screw rod is rotated to enable the second expansion rubber sleeve and the first expansion rubber sleeve of the inner wall of the clamping block to be embedded with each other to achieve sealing and buffering, and finally the expansion water stop strip is installed.
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| FR2789096B1 (en) * | 1999-01-29 | 2001-05-11 | Soc Civ D Brevets Matiere | PRESSURE FLUID CIRCULATION LINE |
| KR20060029901A (en) * | 2004-10-04 | 2006-04-07 | 한미기초개발주식회사 | Method of construction for reinforcement of electric power pipe and water pipe |
| CN202432181U (en) * | 2011-12-28 | 2012-09-12 | 中国海洋石油总公司 | Ultralow temperature pipeline support |
| CN103993604A (en) * | 2014-06-05 | 2014-08-20 | 中国建筑材料工业地质勘查中心广东总队 | Scattered piled anchor foundation pit supporting structure |
| CN206846183U (en) * | 2017-06-15 | 2018-01-05 | 温州益峰科技有限公司 | A kind of adjustment type Pipe leakage stopper |
| CN207049517U (en) * | 2017-07-19 | 2018-02-27 | 益通天然气股份有限公司 | Right feed channel cold-keeping device |
| CN109162283A (en) * | 2018-09-06 | 2019-01-08 | 江苏兴厦建设工程集团有限公司 | A kind of reinforced cement-soil pile anchor support and its construction equipment and construction method |
| CN209179017U (en) * | 2018-11-19 | 2019-07-30 | 北京城建华夏基础建设工程有限公司 | A kind of pattern foundation pit supporting structure water sealing structure |
| CN210291168U (en) * | 2019-07-03 | 2020-04-10 | 孙希文 | Novel low-temperature heat-insulating LNG cold insulation pipe |
| CN210423974U (en) * | 2019-08-28 | 2020-04-28 | 郑晓青 | Pipeline strutting arrangement for hydraulic engineering |
| CN110939811B (en) * | 2019-12-25 | 2024-03-12 | 优捷特清洁能源有限公司 | Vacuum low-temperature pipeline plane flange sealing structure and installation method thereof |
| CN211371458U (en) * | 2019-12-30 | 2020-08-28 | 北京泰德市政工程有限公司 | Environment-friendly gas pipeline prevents aversion device |
| CN111236299B (en) * | 2020-01-14 | 2020-11-27 | 江苏金树建设有限公司 | Municipal road pipeline reinforcement protection system and construction method thereof |
| CN111364482A (en) * | 2020-02-27 | 2020-07-03 | 深圳市粤通建设工程有限公司 | Multi-professional pipeline same-groove excavation construction method |
| CN211821010U (en) * | 2020-03-06 | 2020-10-30 | 陕西骁龙建设工程有限公司 | Novel pipe jacking sealing device |
| CN112459079A (en) * | 2020-11-13 | 2021-03-09 | 浙江省水利水电勘测设计院 | Construction method for buried pipe foundation of high-corrosion stratum |
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