CN104060636A - Depressurization and anti-floating method and device thereof for foundation construction in high water level region building - Google Patents
Depressurization and anti-floating method and device thereof for foundation construction in high water level region building Download PDFInfo
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- CN104060636A CN104060636A CN201410218201.9A CN201410218201A CN104060636A CN 104060636 A CN104060636 A CN 104060636A CN 201410218201 A CN201410218201 A CN 201410218201A CN 104060636 A CN104060636 A CN 104060636A
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- chimney filter
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Abstract
The invention discloses a depressurization and anti-floating method and a device thereof for foundation construction in high water level region building. The method comprises the five steps as follows: surveying and setting out, punching, filter pipe manufacturing, mounting, water pumping and depressurizing and well sealing. Compared with an uplift pile, the depressurization and anti-floating device has the advantages that the construction speed is high, less large-scale mechanical equipment is needed, the device is simple and easy to manufacture, the energy conservation and environmental protection are achieved and the consumption of steel reinforcement and concrete in the construction is lower. The depressurization and anti-floating method and the device are suitable for large-area integral underground structure engineering in the eastern coastland.
Description
Technical field
pressure release anti-float method and device while the present invention relates to a kind of high water level regional architecture foundation construction, belong to the high water level natural basis technical field of construction in underground structure construction.
Background technology
at present, along with scientific and technological development, the continuous minimizing of coastal construction land, developing coastal beach becomes a kind of trend.The sandy silt bearing capacity of coastal beach can meet underground structural bearing capacity requirement, will constantly increase but the high water level of coastal beach has determined the cost that solves underground structure anti-floating, and design conditions can take earthing to solve.If do not taken measures, the construction stage can not reach the requirement of design conditions.Solve construction stage underground structure anti-floating problem, to reduce buoyancy to underground structural damage, invented the apparatus system of high water level without the pressure release anti-floating in stake Underground Construction process.Compare with uplift pile, the features such as its equipment is simple, easy construction, effect is fast, cost is low, the saving energy, environmental protection.
Summary of the invention
the object of the invention is to, pressure release anti-float method and device when a kind of high water level regional architecture foundation construction is provided, to solve construction stage underground structure anti-floating problem, and reduce buoyancy to underground structural damage, thereby overcome the deficiencies in the prior art.
technical scheme of the present invention is achieved in that
pressure release anti-float method when a kind of high water level regional architecture foundation construction of the present invention is that the method is construction according to the following steps after foundation pad construction:
the first step, anchor point of every 500M2 scope internal labeling on foundation pad;
second step, the booster water pump that giant and pressure is greater than to 1.5 Mpa is connected, the vertical deep-well that is greater than 6 meters in each anchor point punching cutter degree of depth by giant;
the 3rd step, first insert the sandstone of approximately 1 meter of thickness in deep-well bottom, then the chimney filter that external diameter is less than deep-well bore is placed on the sandstone of deep-well bottom between two parties, be then filled between chimney filter and deep-well with sandstone, the packed height of sandstone, apart from approximately 1 meter of left and right of deep-well well head, is sealed with clay on sandstone; Chimney filter top is apart from the about 200mm of foundation pad end face.
the 4th step, installing submersible pump in each chimney filter, the submersible pump starting in each chimney filter is extracted the underground water that infiltrates chimney filter out simultaneously, makes groundwater level below foundation pad 500mm;
the 5th step is carried out construction foundation working on foundation pad, when the underground structure top board earthing of building foundation completes, and confirms that underground structure can meet after anti-floating requirement, seals chimney filter.
in preceding method, described second step giant used is to form with steel pipe and Plate Welding; The body of a gun of giant is that one section of external diameter is 50mm, the seamless steel pipe that thickness is 5mm; The nozzle of giant is the conical pipe that is welded on body of a gun lower end, and the outlet internal diameter of conical pipe is 16mm; The body of a gun is provided with punching cutter pipe outward, rushes the external diameter of cutter pipe and determines according to the bore of deep-well, and punching cutter pipe welds through junction plate and the body of a gun; In high pressure water flushing well process, constantly will rush cutter pipe and promote then free-falling behind 1 meter of left and right, the aperture of cutting a hole the external diameter control deep-well of pipe by punching.
in preceding method, described the 3rd step chimney filter used is made with steel pipe; The length of chimney filter and external diameter are determined according to the degree of depth of deep-well and aperture; Spacing between the outer wall of chimney filter and the borehole wall of deep-well is 100-200mm, the scope that chimney filter is filled with sandstone is outward fillter section, and it is 15mm that fillter section is evenly equipped with diameter, the filter bores that spacing is 150mm, fillter section is wrapped with screen pack, and screen pack adopts two-layer close order nylon wire.
the of the present invention a kind of pressure release anti-floating system forming according to said method is, this device comprises deep-well, is provided with chimney filter in deep-well, between chimney filter bottom and chimney filter and deep-well, is provided with sandstone, between the chimney filter on sandstone top and deep-well, be filled with clay, in chimney filter, be provided with submersible pump.
in aforementioned means, described chimney filter bottom is evenly equipped with filter opening, and filter opening is provided with screen pack outward.
in aforementioned means, described chimney filter top is provided with steel plate for sealing water.
owing to having adopted technique scheme, the present invention compared with prior art, the present invention can reduce buoyancy to underground structural damage by high water level without the device of the pressure release anti-floating in stake Underground Construction process, compare with uplift pile, it is fast that the present invention has speed of application, without a large amount of heavy mechanical equipments; Equipment is simply easy to buy or processing and fabricating; Energy-saving and environmental protection, in construction, reinforcing bar and concrete amount are few.The present invention is applicable to coastal region in east China large area entirety construction of underground structure.
Brief description of the drawings
fig. 1 is structural representation of the present invention;
fig. 2 is the partial enlarged drawing in Fig. 1;
fig. 3 is the structural representation of punching giant;
fig. 4 is the structural representation of chimney filter.
being labeled as in figure: 1-deep-well, 2-chimney filter, 3-sandstone, 4-clay, 5-submersible pump, 6-filter opening, 7-screen pack, 8-steel plate for sealing water, the 9-body of a gun, 10-nozzle, 11-punching cutter pipe, 12-junction plate, 13-screen pack, 14-foundation pad.
Detailed description of the invention
below in conjunction with drawings and Examples, the present invention is described in further detail, but not as any limitation of the invention.
pressure release anti-float method when a kind of high water level regional architecture foundation construction of the present invention is that as shown in Figure 1, the method is construction according to the following steps after foundation pad construction:
the first step, anchor point of every 500M2 scope internal labeling on foundation pad;
second step, the booster water pump that giant and pressure is greater than to 1.5 Mpa is connected, the vertical deep-well that is greater than 6 meters in each anchor point punching cutter degree of depth by giant;
the 3rd step, first insert the sandstone of approximately 1 meter of thickness in deep-well bottom, then the chimney filter that external diameter is less than deep-well bore is placed on the sandstone of deep-well bottom between two parties, be then filled between chimney filter and deep-well with sandstone, the packed height of sandstone, apart from approximately 1 meter of left and right of deep-well well head, is sealed with clay on sandstone; Chimney filter top is apart from the about 200mm of foundation pad end face.
the 4th step, installing submersible pump in each chimney filter, the submersible pump starting in each chimney filter is extracted the underground water that infiltrates chimney filter out simultaneously, makes groundwater level below foundation pad 500mm;
the 5th step is carried out construction foundation working on foundation pad, when the underground structure top board earthing of building foundation completes, and confirms that underground structure can meet after anti-floating requirement, seals chimney filter.
aforementioned second step giant used is to form with steel pipe and Plate Welding; The body of a gun 9 of giant is that one section of external diameter is 50mm, the seamless steel pipe that thickness is 5mm; The nozzle 10 of giant is for being welded on the conical pipe of body of a gun lower end, and the outlet internal diameter of conical pipe is 16mm; The outer punching cutter pipe 11 that is provided with of the body of a gun 9, rushes the external diameter of cutter pipe 11 and determines according to the bore of deep-well, and punching is cut a hole pipe 11 and welded through junction plate 12 and the body of a gun 9; In high pressure water flushing well process, constantly will rush cutter pipe 11 and promote then free-falling behind 1 meter of left and right, cut a hole the aperture of the external diameter control deep-well 1 of pipe 11 by punching.Aforementioned the 3rd step chimney filter 2 use steel pipes used are made; The length of chimney filter 2 and external diameter are determined according to the degree of depth of deep-well and aperture; Spacing between the borehole wall of the outer wall of chimney filter 2 and deep-well 1 is 100-200mm, the scope that chimney filter is filled with sandstone 3 is outward fillter section, and it is 15mm that fillter section is evenly equipped with diameter, the filter opening 6 that spacing is 150mm, fillter section is wrapped with screen pack 13, and screen pack adopts two-layer close order nylon wire.
the structural representation of the of the present invention a kind of pressure release anti-floating system forming according to said method as illustrated in fig. 1 and 2, this device comprises deep-well 1, in deep-well 1, be provided with chimney filter 2, between chimney filter 2 bottoms and chimney filter 2 and deep-well 1, be provided with sandstone 3, between the chimney filter 2 on sandstone 3 tops and deep-well 1, be filled with clay 4, in chimney filter 2, be provided with submersible pump 5.Chimney filter 2 bottoms are evenly equipped with filter opening 6, the outer screen pack 7 that is provided with of filter opening 6.Chimney filter 2 tops are provided with steel plate for sealing water 8.
Embodiment
1, measure unwrapping wire
after foundation pad 14 constructions, anchor point of every 500 ㎡ mark on foundation pad 14, anchor point adopts paint mark, as the foundation of perforate punching.
2, punching
adopt pressure to reach the above booster water pump of 1.50MPa, connect giant by snakelike high-pressure rubber pipe, the body of a gun of giant is Φ 50 × 5mm seamless steel pipe, it is that the conical pipe of Φ 16mm is as nozzle 10 that a sector hole mouth is welded in lower end, the steel pipe that the body of a gun 9 overcoats have a segment length 150mm diameter of phi 610 × 13mm is as punching cutter pipe 11, the water under high pressure spraying by nozzle 10 and punching cutter pipe 11 on deep-well 1 hole wall, rush cutter pore-forming.
giant is aimed to position, well point, start high-pressure hydraulic pump, hydraulic pressure control is at 1.5MPa, impacts undershoot cutter pipe 11 and starts to sink, and constantly promote and put down punching cutter pipe 11 by rope and cut a hole and managed 11 and rush the borehole wall of cutting a hole deep-wells by punching at the high-pressure spray of giant.By experience, for the general sand clay that contains, punching is cut a hole the each hoisting depth of pipe 11 1 meter of left and right and then is put down, and falls apart from 1 meter of left and right, cuts a hole under the die-cut effect of pipe 11 at water under high pressure and punching, can go out greatly the hole of 1 meter of left and right within 25～30min time.If run into thicker pure clay in die-cut process time, the immersed tube time will extend, now can take to increase the pressure of high-pressure hydraulic pump, to reach the speed of accelerating immersed tube.The drilling diameter of impact opening is corresponding with the diameter of punching cutter pipe 11, and in this example, the diameter of punching cutter pipe 11 is 600mm.The diameter of deep-well 1 should be greater than the external diameter of chimney filter 2, to guarantee there is certain gap between chimney filter 2 outer walls and deep-well 1 inwall, to fill sandstone 3 between chimney filter 2 and deep-well 1, the projected depth of punching is 6 meters, when actual punching, should be than more than the dark 500mm of chimney filter 2 projected depth, the part earth fall falls when preventing that punching cutter pipe 11 from extracting, and makes chimney filter 2 bottoms have enough sandstones 3.
it is vertical that punching cutter pipe 11 should keep while moving up and down, makes the deep-well borehole wall keep vertical, if run into larger stone and fragment of brick should be removed in time, well-digging again after can being shifted cannot remove time in the time punchinging.
3, the making of chimney filter and installation
chimney filter 2 adopts the steel pipe of diameter 300 × 3.5mm or iron pipe to make, chimney filter 2 length are about 6 meters, chimney filter 2 bottom lengths 5.3m scopes are fillter section, fillter section is provided with diameter 15mm spacing 150mm filter opening 6, filter opening 6 is by quincunx uniform, fillter section is enclosed with screen pack 13, and screen pack 13 is two-layer close order nylon wire.After chimney filter 2 is made, be first the sandstone 3 of 1 meter of left and right in the bottom of deep hole 1 pad a layer thickness, then the chimney filter of making 2 vertically stood on the sandstone 3 of deep-well 1 bottom between two parties, put into after chimney filter 2, fill sandstone 3 in chimney filter surrounding, chimney filter 2 tops exceed foundation pad 14 end face 200mm.Chimney filter 2 arranges the steel plate for sealing water 8 that 3mm is thick in foundation pad, and steel plate for sealing water 8 is the annular of width 150mm.Foundation pad 14 adopts concreting to pressure release tube wall.
chimney filter should be placed on the centre of wellhole, and the effect of gravel packer is to improve water permeability, and prevents that grogs from infiltrating chimney filter and stopping up the filter opening of chimney filter and the mesh of screen pack.Back-up sand thickness is wanted evenly, and it is fast that speed is wanted, and back-up sand must not be interrupted midway, the soil in case the hole wall of deep-well collapses.
the packed height of sandstone 3, at least will exceed the following 1～1.5m in chimney filter top, and on it, 1～1.5m adopts clay joint filling, prevents gas leakage.
4, the pressure release of drawing water
chimney filter 2 tries to take out after all installing.After all pumping equipments work well, the whole pipeline that draws water reaches the water yield of design, can drop into normal pumping operation, and guaranteed water level is in the following 500mm of foundation pad 14.
5, shut-in well
the Sealing Conditions of chimney filter, the earthing of foundation pad 14 top boards completes, and structure design operating mode meet anti-floating require after, carry out chimney filter shutoff.Shutoff adopts steel concrete to carry out shutoff, when reinforcing bar is met chimney filter, tube wall is walked around in bending, chimney filter outside is positioned at the thick steel plate for sealing water of base plate middle part welding 3mm, steel plate for sealing water is annular, the internal diameter of steel plate for sealing water is corresponding with chimney filter, and the external diameter of steel plate for sealing water is 600mm, and shut-in well carries out with concreting simultaneously.When load meets after the requirement of structure anti-floating, chimney filter side can seal, and bottom cushion is filled with sand below, and base plate scope adopts C35 slightly expanded concrete to divide and builds for three times, build 200mm thick at every turn, 6, the suitable welded reinforcement head of chimney filter inwall, builds at every turn and observes 3 days, non-leakagely can build lower one deck, before building for the third time, below base plate face, in chimney filter, be welded with 3mm steel plate and chimney filter full weld, be embedded in for the third time below concrete.If excessive employing diameter 20 catheter drainages of hydraulic pressure, then slip casting.
6, surveillance and monitoring
pressure release precipitation run duration, observation well should at least be monitored once every day, and in water level abnormality situation, water-level observation frequency increases according to actual needs.According to the water level monitoring form every day of statistics water level form in time, form curves of water level, analyze water level to structure influence situation.
water table measure should be according to relevant monitoring requirements such as exploration report, precipitation design document, precipitation scheme and the designs of dewatering construction tissue, formulates monitoring monitoring scheme, proposes every alarming value boundary line.Monitoring record should specification, and monitored data should be accurate, and calculates and arrange in time, proposes reasonable opinion, the units concerned such as report design, management after examination & verification.
Claims (6)
1. pressure release anti-float method when high water level regional architecture foundation construction, is characterized in that: the method is construction according to the following steps after foundation pad construction:
The first step, every 500M on foundation pad
2anchor point of scope internal labeling;
Second step, the booster water pump that giant and pressure is greater than to 1.5 Mpa is connected, the vertical deep-well that is greater than 6 meters in each anchor point punching cutter degree of depth by giant;
The 3rd step, first insert the sandstone of approximately 1 meter of thickness in deep-well bottom, then the chimney filter that external diameter is less than deep-well bore is placed on the sandstone of deep-well bottom between two parties, be then filled between chimney filter and deep-well with sandstone, the packed height of sandstone, apart from approximately 1 meter of left and right of deep-well well head, is sealed with clay on sandstone; Chimney filter top is apart from the about 200mm of foundation pad end face;
The 4th step, installing submersible pump in each chimney filter, the submersible pump starting in each chimney filter is extracted the underground water that infiltrates chimney filter out simultaneously, makes groundwater level below foundation pad 500mm;
The 5th step is carried out construction foundation working on foundation pad, when the underground structure top board earthing of building foundation completes, and confirms that underground structure can meet after anti-floating requirement, seals chimney filter.
2. method according to claim 1, is characterized in that: described second step giant used is to form with steel pipe and Plate Welding; The body of a gun of giant is that one section of external diameter is 50mm, the seamless steel pipe that thickness is 5mm; The nozzle of giant is the conical pipe that is welded on body of a gun lower end, and the outlet internal diameter of conical pipe is 16mm; The body of a gun is provided with punching cutter pipe outward, rushes the external diameter of cutter pipe and determines according to the bore of deep-well, and punching cutter pipe welds through junction plate and the body of a gun; In high pressure water flushing well process, constantly will rush cutter pipe and promote then free-falling behind 1 meter of left and right, the aperture of cutting a hole the external diameter control deep-well of pipe by punching.
3. method according to claim 1, is characterized in that: described the 3rd step chimney filter used steel pipe is made; The length of chimney filter and external diameter are determined according to the degree of depth of deep-well and aperture; Spacing between the outer wall of chimney filter and the borehole wall of deep-well is 100-200mm, the scope that chimney filter is filled with sandstone is outward fillter section, and it is 15mm that fillter section is evenly equipped with diameter, the filter bores that spacing is 150mm, fillter section is wrapped with screen pack, and screen pack adopts two-layer close order nylon wire.
4. the pressure release anti-floating system forming according to the arbitrary described method of claim 1-3, comprise deep-well (1), it is characterized in that: in deep-well (1), be provided with chimney filter (2), between chimney filter (2) bottom and chimney filter (2) and deep-well (1), be provided with sandstone (3), between the chimney filter (2) on sandstone (3) top and deep-well (1), be filled with clay (4), in chimney filter (2), be provided with submersible pump (5).
5. install according to claim 4, it is characterized in that: described chimney filter (2) bottom is evenly equipped with filter opening (6), the outer screen pack (7) that is provided with of filter opening (6).
6. install according to claim 5, it is characterized in that: described chimney filter (2) top is provided with steel plate for sealing water (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410218201.9A CN104060636B (en) | 2014-05-22 | 2014-05-22 | Pressure release anti-float method during high water level regional architecture foundation construction and device |
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| CN201410218201.9A CN104060636B (en) | 2014-05-22 | 2014-05-22 | Pressure release anti-float method during high water level regional architecture foundation construction and device |
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| CN104060636A true CN104060636A (en) | 2014-09-24 |
| CN104060636B CN104060636B (en) | 2016-06-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109441355A (en) * | 2019-01-03 | 2019-03-08 | 上海市水利工程集团有限公司 | Silt or sand bed pipe well high pressure water flushing fast pore-creating construction method |
| CN109812223A (en) * | 2019-03-25 | 2019-05-28 | 五冶集团上海有限公司 | It is a kind of suitable for silt, the hole punched device of flour sand soil property and application method |
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| CN109441355A (en) * | 2019-01-03 | 2019-03-08 | 上海市水利工程集团有限公司 | Silt or sand bed pipe well high pressure water flushing fast pore-creating construction method |
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| Publication number | Publication date |
|---|---|
| CN104060636B (en) | 2016-06-22 |
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