CN108331033A - A kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure and its construction - Google Patents

A kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure and its construction Download PDF

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Publication number
CN108331033A
CN108331033A CN201810115502.7A CN201810115502A CN108331033A CN 108331033 A CN108331033 A CN 108331033A CN 201810115502 A CN201810115502 A CN 201810115502A CN 108331033 A CN108331033 A CN 108331033A
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CN
China
Prior art keywords
hydrophobic
bottom plate
pipe network
sump
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810115502.7A
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Chinese (zh)
Inventor
金国龙
林靖
李华梅
王鑫
李昀
周竝
袁坚
任家佳
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China Shipbuilding NDRI Engineering Co Ltd
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China Shipbuilding NDRI Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Shipbuilding NDRI Engineering Co Ltd filed Critical China Shipbuilding NDRI Engineering Co Ltd
Priority to CN201810115502.7A priority Critical patent/CN108331033A/en
Publication of CN108331033A publication Critical patent/CN108331033A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10Protective 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 soil pressure or hydraulic pressure
    • E02D31/12Protective 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 soil pressure or hydraulic pressure against upward hydraulic pressure

Abstract

The invention discloses a kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure and its constructions, its main feature is that bottom plate is arranged on the hydrophobic layer equipped with hydrophobic pipe network, hydrophobic pipe network is connected to sump by hydrophobic channel, and the hydrophobic layer is arranged by screed-coat under the insulating layer of bottom plate;Temperature sensor and electricity heating pipeline are buried in the insulating layer;The hydrophobic pipe network is crisscross connection into latticed draining circuit;The sump setting is connected in bottom plate both sides, and by hydrophobic channel with hydrophobic pipe network.The present invention has many advantages, such as that safe, low engineering cost, construction period are short, daily management is convenient compared with prior art, reduce the demand of anti-crack to bottom plate, not only meet the stability requirement of sunken tank, and the ground settlement of ambient enviroment also can control within the allowable range, anti-floating effect of easing stress is apparent, especially adapts to the Anti-floating design compared with depth underground space structure.

Description

A kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure and its construction
Technical field
The present invention relates to underground structure anti-floating technical field, specifically a kind of LNG sunken tanks bottom plate anti-floating decompression Structure and its construction.
Background technology
With the acceleration of urbanization process, the exploitation of the underground space is increasingly taken seriously, for Large Underground Emporium, The hypogees such as lower garage parking, basement bottom board also become due to underground water and the uplift pressure of earth's surface water penetration generation, anti-floating Emphasis in engineering design.Measure of anti float in underground engineering is led to mainly using anti-float anchor rod and anti-floating pile are arranged under bottom plate It crosses the overlying weight for increasing underground structure or sets anti-float anchor rod, uplift pile balance buoyancy force of underground water, this method is for structure bottom The control of plate and inhomogeneous deformation requires relatively high, water buoyancy small structure base slab shallow suitable for underground structure buried depth.With landing The buried depth of lower structure increases, the linear ratio of water buoyancy increases, and the project cost of pulling resistant anchor pile setting is also in non-linear add therewith Greatly, and to structure cracking resistance, antifatigue higher is required.
Currently, LNG(Liquefied natural gas)Sunken tank measure of anti float is mainly using in increasing base plate thickness and under bottom plate Anti-float anchor rod and anti-floating pile are set to realize, in storage tank under emptying state, mainly with bottom plate and the withdrawal resistance of uplift pile Water buoyancy is resisted, with the enlargement of LNG storage tank, tank diameter is more than 100m, to increase base plate thickness and increase resistance to plucking anchor The engineering cost of stake setting is high, short construction period, and anti-floating effect is poor.
Invention content
The purpose of the present invention is in view of the deficiencies of the prior art and design a kind of LNG sunken tanks bottom plate anti-floating depressurize knot Structure and its construction, using sandstone inverted filter and draining circuit pipe network are arranged under storage tank bottom plate, make sunken tank be in it is unloaded or from It is not enough to again in the state of balance buoyancy force of underground water, underground water is discharged into sump by the draining circuit pipe under bottom plate and is pumped Go out, reduces water to the uplift pressure of bottom plate, thoroughly solve underground water uplift pressure from source, by the main control of buried sunken tank Load processed is thoroughly reduced by way of hydrophobic decompression, so as to avoid tank body floating and the risk of bottom slab crack, is not only met The stability requirement of sunken tank, and the ground settlement of ambient enviroment also can control within the allowable range, structure Simply, anti-floating effect of easing stress is apparent, low to the demand of anti-crack of bottom plate, have safe, low engineering cost, construction period it is short, The advantages that daily management facilitates especially adapts to the Anti-floating design compared with depth underground space structure.
Realizing the technical solution of the object of the invention is:A kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure, including by bottom plate With the storage tank of ontology composition, its main feature is that bottom plate is arranged on the hydrophobic layer equipped with hydrophobic pipe network, hydrophobic pipe network is by hydrophobic channel It is connected to sump, the hydrophobic layer is the metalling being laid in permeable geotextiles or non-fine concrete layer, and is set by screed-coat It sets under the insulating layer of bottom plate;Temperature sensor and electricity heating pipeline are buried in the insulating layer;The hydrophobic pipe network is setting Several drainpipes for being uniformly covered with aperture in hydrophobic layer, and with crisscross connection at latticed draining circuit;It is described Sump setting is connected in bottom plate both sides, and by hydrophobic channel with hydrophobic pipe network, and seepage in underground passes through the drain pipe in hydrophobic layer Net converges into after sump and hydrophobic pipe network is discharged by immersible pump.
The hydrophobic pipe network is arranged for upper and lower two layers in hydrophobic layer, and respectively by the collection of hydrophobic channel and bottom plate both sides Well connection two sets of independent hydrophobic pipeline systems of composition.
The drainpipe outer wrapping geotechnique anti-filter cloth.
Waterproof geotextiles are equipped between the screed-coat and hydrophobic layer.
A kind of construction of LNG sunken tanks bottom plate anti-floating pressure reduction structure, its main feature is that Specific construction includes the following steps:
A, the laying of permeable geotextiles
Sunken tank excavation of foundation pit divides concatenation unit simultaneously after basal surface is smooth to designed elevation according to the breadth of permeable geotextiles It is laid with permeable geotextiles.
B, the laying of hydrophobic layer and hydrophobic pipe network
It is laid with hydrophobic layer in permeable geotextiles, and is laid in hydrophobic layer tamping, being levelling for hydrophobic pipe network and pipe trench, it is described to dredge Water layer is directly poured on rock quality base using non-fine concrete, is laid with and is rolled close using graded broken stone layering on earthen foundation It is real, the construction for carrying out screed-coat and insulating layer after waterproof geotextiles successively is laid on hydrophobic layer, and buried in insulating layer Temperature sensor and electricity heating pipeline;The hydrophobic pipe network is arranged for upper and lower two layers in hydrophobic layer, and respectively by hydrophobic channel Two sets of independent hydrophobic pipeline systems of composition are connected to the sump of bottom plate both sides, hydrophobic pipe network is uniformly covered with aperture by several Drainpipe, and upper and lower two sets independent latticed draining circuits forms with crisscross connection, drainpipe outer wrapping is geotechnological instead Filter cloth;The diameter and quantity of the aperture are determined by seepage in underground amount.
C, the construction of sump and hydrophobic channel
The construction of hydrophobic channel and sump is carried out in the both sides of bottom plate, the sump includes:It is laid with concrete cushion, branch Mould, reinforcing bar binding installation and sump construction of bottom plates, sump are connected to hydrophobic pipe network by hydrophobic channel, finally pacify in sump Steel loading cat ladder, sump cover board, check valve and immersible pump.
The present invention has good stability against floating performance compared with prior art, effectively reduces seepage in underground water to bottom plate Uplift pressure, greatly reduce the demand of anti-crack of sunken tank bottom plate, simple in structure, short construction period, economy is high, not only full The stability requirement of foot sunken tank, and the ground settlement of ambient enviroment also can control within the allowable range, resist Floating effect of easing stress is apparent, especially adapts to the Anti-floating design compared with depth underground space structure.
Description of the drawings
Fig. 1 is schematic structural view of the invention;
Fig. 2 is the A node enlarged diagrams of Fig. 1;
Fig. 3 is hydrophobic pipe network structure schematic diagram;
Fig. 4 is drain pipe structural schematic diagram;
Fig. 5 is the B-B sectional views of Fig. 4.
Specific implementation mode
Refering to attached drawing 1, the present invention includes the storage tank being made of bottom plate 1 and ontology 11, and bottom plate 1 is arranged equipped with hydrophobic pipe network On 5 hydrophobic layer 4, hydrophobic pipe network 5 is connected to sump 8 by hydrophobic channel 7, and being laid with respectively above and below for the hydrophobic layer 4 is waterproof Geotextiles 14 and permeable geotextiles 6;It is laid with screed-coat 3 and insulating layer 2 successively in the waterproof geotextiles 14;The insulating layer Temperature sensor and electricity heating pipeline 15 are buried in 2;The hydrophobic pipe network 5 is arranged for upper and lower two layers in hydrophobic layer 4, and point It is not connected to the sump 8 of 1 both sides of bottom plate by hydrophobic channel 7 and forms two sets of independent hydrophobic pipeline systems.
Refering to attached drawing 2, the hydrophobic layer 4 is the metalling being laid in permeable geotextiles 6 or non-fine concrete layer, and by Screed-coat 3 is arranged under the insulating layer 2 of bottom plate 1;Temperature sensor and electricity heating pipeline 15 are buried in the insulating layer 2;It is described The setting of sump 8 is connected in 1 both sides of bottom plate, and by hydrophobic channel 7 with hydrophobic pipe network 5, and seepage in underground passes through dredging in hydrophobic layer 4 Grid 5 converges into after sump 8 and hydrophobic pipe network 5 is discharged by immersible pump 9.
Refering to attached drawing 3, the hydrophobic pipe network 5 be upper and lower two layers be arranged in hydrophobic layer 4, and respectively by hydrophobic channel 7 with The connection two sets of independent hydrophobic pipeline systems of composition of sump 8 of 1 both sides of bottom plate, hydrophobic pipe network 5 is uniformly covered with small by several The drainpipe 12 in hole 10 forms the latticed draining circuit of crisscross connection.
Refering to 4~Fig. 5 of attached drawing, the drainpipe 12 uses stainless steel tube, pipe outer wrapping geotechnique's anti-filter cloth 13, the row Inlet opening 10 on water pipe 12, aperture and quantity are determined by seepage in underground amount.
Below with certain LNG(Liquefied natural gas)For anti-floating depressurized system under sunken tank bottom plate to the present invention make into One step explanation:
Embodiment 1
Refering to attached drawing 3, which is earthen foundation, and drainpipe 12 in length and breadth for 12m arrange by spacing, and the thickness of hydrophobic layer 4 is 600mm, Drainpipe 5 is set in hydrophobic layer 4, and seepage in underground is after drainpipe 12 is collected to outside storage tank 11 sump 8 by hydrophobic channel 7 Hydrophobic pipe network 5 is discharged by immersible pump 9, steps are as follows for Specific construction:
(One), permeable geotextile laying
Refering to attached drawing 1, it is -52.50m to be excavated to 1 time designed elevation of bottom plate, carries out basal surface finishing, and meet flatness requirement After start to be laid with permeable geotextiles 6, paved surface will first ensure the installation requirement of geotextiles, ensure smooth degree and permeable geotextiles 6 are not destroyed.
(Two), hydrophobic layer be laid with and drainpipe installation
The hydrophobic layer 4 of graded broken stone, the thickness about 600mm of hydrophobic layer 4 are set in permeable geotextiles 6, and rubble must be layered laying And grinding compacting, the circle gravel of small particle is first laid in permeable geotextiles 6, grade separation is laid with rubble on gravel layer, and hydrophobic Layer 4 in bury material be stainless steel drainpipe 12, last layer be laid with, roll after, surface should carry out again it is levelling, then Be laid with one layer of waterproof geotextiles 14 on hydrophobic layer 4, the drainpipe 12 using Φ 500 stainless steel tube, on tube wall The even aperture 10 for being covered with Φ 20 forms and meets the drainpipe 12 that infiltration requires, and drainpipe 12 is welded, installed at the scene, and according to Two sets of independent hydrophobic pipeline systems are arranged in different level, and each drainpipe 12 is spaced about 12m, is mutually connected between drainpipe 12 It is logical, form crisscross hydrophobic pipe network 5.The hydrophobic pipe network 5 is arranged for upper and lower two layers in hydrophobic layer 4, and respectively by dredging Water channel 7 is connected to two sets of independent hydrophobic pipeline systems of composition with the sump 8 of 1 both sides of bottom plate.
(Three), screed-coat and thermal insulation layer construction
The construction for carrying out screed-coat 3 and insulating layer 2 after waterproof geotextiles 14 successively, the screed-coat are laid on hydrophobic layer 4 3 using plain concrete or fiber concrete, and thickness is 300 ~ 600mm, and the insulating layer 2 uses plain concrete or fiber coagulation Soil, thickness are 300 ~ 600mm, bury temperature sensor and electricity heating pipeline 15 between two parties in concrete.
(Four), storage tank bottom plate and the well construction that catchments
On insulating layer 2 carry out armored concrete bottom plate 1 construct, and 1 both sides symmetrical construction bottom absolute altitude of bottom plate be- The hydrophobic channel 7 and sump 8 of 55.00m, and hydrophobic pipe network 5 near sunken tank inner-outer wall annular manifold by hydrophobic Sump 8 is accessed in channel 7, and 8 mouthfuls of sump passes to ground and installs check valve, and the sump 8 is located at outside ontology 11, and by dredging Water channel 7 is connected to under bottom plate 1 with hydrophobic pipe network 5, and the transfer passage that sump 8 can be used as material in construction period uses, The access path that the normal use phase can be used as hydrophobic layer 4 uses, and two sets of independent draining systems under bottom plate 1 are respectively by hydrophobic logical The access of road 7 is arranged in the sump 8 of sunken tank both sides, finally installation steel cat ladder, sump cover board, list in sump 8 To valve and immersible pump 9.
The present invention uses in this way:Liquid storing heights synthesis in water level and sunken tank under binding base plate 1 determines latent The startup of water pump 9 and time of pumping, hydrophobic pipe network 5 are two sets independent hydrophobic pipeline systems, are that " one with one when normal use It is standby ", to improve the safety of total system.It is above that only the present invention is further illustrated, not to limit this patent, All is equivalence enforcement of the present invention, is intended to be limited solely by within the right of this patent.

Claims (5)

1. a kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure, includes the storage tank being made of bottom plate and ontology, it is characterised in that bottom Plate is arranged on the hydrophobic layer equipped with hydrophobic pipe network, and hydrophobic pipe network is connected to sump by hydrophobic channel, and the hydrophobic layer is to be laid with Metalling in permeable geotextiles or non-fine concrete layer, and be arranged under the insulating layer of bottom plate by screed-coat;The heat preservation Temperature sensor and electricity heating pipeline are buried in layer;The hydrophobic pipe network is to be arranged in hydrophobic layer several to be uniformly covered with aperture Drainpipe, and with it is crisscross connection at latticed draining circuit;The sump is arranged in bottom plate both sides, and by hydrophobic Channel is connected to hydrophobic pipe network, and seepage in underground converges into sump by the hydrophobic pipe network in hydrophobic layer, and is discharged by immersible pump Hydrophobic pipe network.
2. LNG sunken tanks bottom plate anti-floating pressure reduction structure according to claim 1, it is characterised in that the hydrophobic pipe network is Be arranged in hydrophobic layer for upper and lower two layers, and be connected to respectively with the sump of bottom plate both sides by hydrophobic channel form two sets it is independent Hydrophobic pipeline system.
3. LNG sunken tanks bottom plate anti-floating pressure reduction structure according to claim 1, it is characterised in that the drainpipe outer wrapping Geotechnological anti-filter cloth.
4. LNG sunken tanks bottom plate anti-floating pressure reduction structure according to claim 1, it is characterised in that the screed-coat with it is hydrophobic Waterproof geotextiles are equipped between layer.
5. the construction of LNG sunken tanks bottom plate anti-floating pressure reduction structure described in a kind of claim 1, it is characterised in that Specific construction packet Include following steps:
A, the laying of permeable geotextiles
Sunken tank excavation of foundation pit divides concatenation unit simultaneously after basal surface is smooth to designed elevation according to the breadth of permeable geotextiles It is laid with permeable geotextiles;
B, the laying of hydrophobic layer and hydrophobic pipe network
It is laid with hydrophobic layer in permeable geotextiles, and is laid in hydrophobic layer tamping, being levelling for hydrophobic pipe network and pipe trench, it is described Hydrophobic layer is directly poured on rock quality base using non-fine concrete, is laid with and is rolled using graded broken stone layering on earthen foundation It is closely knit, the construction for carrying out screed-coat and insulating layer after waterproof geotextiles successively is laid on hydrophobic layer, and buried in insulating layer If temperature sensor and electricity heating pipeline;The hydrophobic pipe network is arranged for upper and lower two layers in hydrophobic layer, and respectively by hydrophobic logical Road is connected to two sets of independent hydrophobic pipeline systems of composition with the sump of bottom plate both sides, and hydrophobic pipe network is uniformly covered with small by several The drainpipe in hole, and upper and lower two sets independent latticed draining circuits, drainpipe outer wrapping geotechnique are formed with crisscross connection Anti-filter cloth;The diameter and quantity of the aperture are determined by seepage in underground amount;
C, the construction of sump and hydrophobic channel
The construction of hydrophobic channel and sump is carried out in the both sides of bottom plate, the sump includes:It is laid with concrete cushion, branch Mould, reinforcing bar binding installation and sump construction of bottom plates, sump are connected to hydrophobic pipe network by hydrophobic channel, finally pacify in sump Steel loading cat ladder, sump cover board, check valve and immersible pump.
CN201810115502.7A 2018-02-06 2018-02-06 A kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure and its construction Pending CN108331033A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810115502.7A CN108331033A (en) 2018-02-06 2018-02-06 A kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure and its construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810115502.7A CN108331033A (en) 2018-02-06 2018-02-06 A kind of LNG sunken tanks bottom plate anti-floating pressure reduction structure and its construction

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CN108331033A true CN108331033A (en) 2018-07-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109024711A (en) * 2018-07-28 2018-12-18 江苏地基工程有限公司 Underground structure anti-floating system and its construction method
CN110080205A (en) * 2019-05-15 2019-08-02 广州穗岩土木科技股份有限公司 A kind of construction method of subway station diaphragm wall

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109024711A (en) * 2018-07-28 2018-12-18 江苏地基工程有限公司 Underground structure anti-floating system and its construction method
CN109024711B (en) * 2018-07-28 2020-07-21 江苏地基工程有限公司 Underground structure anti-floating system and construction method thereof
CN110080205A (en) * 2019-05-15 2019-08-02 广州穗岩土木科技股份有限公司 A kind of construction method of subway station diaphragm wall

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