CN104060636B - Pressure release anti-float method during high water level regional architecture foundation construction and device - Google Patents
Pressure release anti-float method during high water level regional architecture foundation construction and device Download PDFInfo
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- CN104060636B CN104060636B CN201410218201.9A CN201410218201A CN104060636B CN 104060636 B CN104060636 B CN 104060636B CN 201410218201 A CN201410218201 A CN 201410218201A CN 104060636 B CN104060636 B CN 104060636B
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- chimney filter
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- pipe
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Abstract
<b>pressure release anti-float method when the invention discloses a kind of high water level regional architecture foundation construction and device, the method includes surveying setting-out, punching, chimney filter make with install, draw water pressure release and 5 steps of shut-in well。The present invention, compared with uplift pile, has speed of application fast, it is not necessary to substantial amounts of heavy mechanical equipment；Equipment is simply prone to make；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。</b>
Description
Technical field
Pressure release anti-float method when the present invention relates to a kind of high water level regional architecture foundation construction and device, belong to the high water level natural basis technical field of construction during underground structure is built。
Background technology
At present, along with the development of science and technology, the continuous minimizing of coastal construction land, developing Coastal beach ground becomes a kind of trend。The sandy silt bearing capacity of Coastal beach can meet underground structural bearing capacity requirement, but the high water level of Coastal beach determines the cost solving underground structure anti-floating and will be continuously increased, and design conditions can take earthing to solve。As taken no action to, 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, invent the high water level apparatus system without the pressure release anti-floating in stake Underground Construction process。Compared with uplift pile, its equipment is simple, easy construction, effect is fast, cost is low, save the feature such as the energy, environmental protection。
Summary of the invention
It is an object of the invention to, it is provided that pressure release anti-float method during a kind of high water level regional architecture foundation construction and device, to solve construction stage underground structure anti-floating problem, and reducing buoyancy to underground structural damage, thus overcoming the deficiencies in the prior art。
The technical scheme is that and be achieved in that:
Pressure release anti-float method during a kind of high water level regional architecture foundation construction of the present invention is, the method is construction according to the following steps after blinding layer is constructed:
The first step, every one anchor point of 500M2 scope internal labeling on blinding layer；
Second step, is connected giant with the pressure booster water pump more than 1.5Mpa, by giant at each anchor point punching cutter degree of depth vertical deep-well more than 6 meters；
3rd step, bottom deep-well, first insert the sandstone of thickness about 1 meter, then external diameter is centrally disposed on the sandstone bottom deep-well less than the chimney filter of deep-well bore, be then filled between chimney filter and deep-well with sandstone, the packed height of sandstone, from about about 1 meter of deep-well well head, is closed with clay on sandstone；Chimney filter top is about 200mm from blinding layer end face。
4th step, installing submersible pump in each chimney filter, the subsoil water penetrating into chimney filter is extracted out by the immersible pump started in each chimney filter simultaneously, makes groundwater level be in below blinding layer 500mm；
5th step, carries out construction foundation working on blinding layer, when the underground structure top board earthing of building foundation completes, and confirm underground structure can meet anti-floating require after, by chimney filter close。
In preceding method, giant used by described second step is to form with steel pipe and Plate Welding；The body of a gun of giant is one section of external diameter is 50mm, and thickness is the seamless steel pipe of 5mm；The nozzle of giant is the conical pipe being welded on body of a gun lower end, and the exit inside diameter of conical pipe is 16mm；The body of a gun is externally provided with punching cutter pipe, and the external diameter of punching cutter pipe is determined according to the bore of deep-well, and punching cutter pipe is connected plate and welds with the body of a gun；In high pressure water flushing well process, constantly punching is cut a hole then free-falling after pipe promotes about 1 meter, by rushing the aperture of the outside diameter control deep-well of cutter pipe。
In preceding method, chimney filter steel pipe used by described 3rd step is made；The length of chimney filter and external diameter are determined according to the degree of depth and the aperture of deep-well；Spacing between outer wall and the borehole wall of deep-well of chimney filter is 100-200mm, being filled with the fillter section that ranges for of sandstone outside chimney filter, it is 15mm that fillter section is evenly equipped with diameter, and spacing is the filtering holes of 150mm, fillter section is wrapped with drainage screen, and drainage screen adopts the close order nylon wire of two-layer。
A kind of pressure release anti-floating system of the present invention according to said method composition is, this device includes deep-well, is provided with chimney filter in deep-well, is provided with sandstone bottom chimney filter and between chimney filter and deep-well, it is filled with clay between chimney filter and the deep-well on sandstone top, in chimney filter, is provided with immersible pump。
In aforementioned means, described chimney filter bottom is evenly equipped with filter opening, and filter opening is externally provided with drainage screen。
In aforementioned means, described chimney filter top is provided with steel plate for sealing water。
Owing to have employed technique scheme, the present invention is 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, compared with uplift pile, it is fast that the present invention has speed of application, it is not necessary to substantial amounts of heavy mechanical equipment；Equipment is simply prone 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。
Accompanying drawing explanation
Fig. 1 is the 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-immersible pump, 6-filter opening, 7-drainage screen, 8-steel plate for sealing water, the 9-body of a gun, 10-nozzle, 11-punching cutter pipe, 12-connecting plate, 13-drainage screen, 14-blinding layer。
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 during a kind of high water level regional architecture foundation construction of the present invention is, as it is shown in figure 1, the method is construction according to the following steps after blinding layer is constructed:
The first step, every one anchor point of 500M2 scope internal labeling on blinding layer；
Second step, is connected giant with the pressure booster water pump more than 1.5Mpa, by giant at each anchor point punching cutter degree of depth vertical deep-well more than 6 meters；
3rd step, bottom deep-well, first insert the sandstone of thickness about 1 meter, then external diameter is centrally disposed on the sandstone bottom deep-well less than the chimney filter of deep-well bore, be then filled between chimney filter and deep-well with sandstone, the packed height of sandstone, from about about 1 meter of deep-well well head, is closed with clay on sandstone；Chimney filter top is about 200mm from blinding layer end face。
4th step, installing submersible pump in each chimney filter, the subsoil water penetrating into chimney filter is extracted out by the immersible pump started in each chimney filter simultaneously, makes groundwater level be in below blinding layer 500mm；
5th step, carries out construction foundation working on blinding layer, when the underground structure top board earthing of building foundation completes, and confirm underground structure can meet anti-floating require after, by chimney filter close。
Giant used by aforementioned second step is to form with steel pipe and Plate Welding；The body of a gun 9 of giant is one section of external diameter is 50mm, and thickness is the seamless steel pipe of 5mm；The nozzle 10 of giant is the conical pipe being welded on body of a gun lower end, and the exit inside diameter of conical pipe is 16mm；The body of a gun 9 is externally provided with punching cutter pipe 11, and the external diameter of punching cutter pipe 11 is determined according to the bore of deep-well, and punching cutter pipe 11 is connected plate 12 and welds with the body of a gun 9；In high pressure water flushing well process, constantly punching is cut a hole then free-falling after pipe 11 promotes about 1 meter, by rushing the aperture of the outside diameter control deep-well 1 of cutter pipe 11。Chimney filter 2 used by aforementioned 3rd step is made with steel pipe；The length of chimney filter 2 and external diameter are determined according to the degree of depth and the aperture of deep-well；Spacing between outer wall and the borehole wall of deep-well 1 of chimney filter 2 is 100-200mm, being filled with the fillter section that ranges for of sandstone 3 outside chimney filter, it is 15mm that fillter section is evenly equipped with diameter, and spacing is the filter opening 6 of 150mm, fillter section is wrapped with drainage screen 13, and drainage screen adopts the close order nylon wire of two-layer。
The structural representation of a kind of pressure release anti-floating system of the present invention according to said method composition is as illustrated in fig. 1 and 2, this device includes deep-well 1, chimney filter 2 it is provided with in deep-well 1, sandstone 3 it is provided with bottom chimney filter 2 and between chimney filter 2 and deep-well 1, it is filled with clay 4 between chimney filter 2 and the deep-well 1 on sandstone 3 top, in chimney filter 2, is provided with immersible pump 5。Chimney filter 2 bottom is evenly equipped with filter opening 6, and filter opening 6 is externally provided with drainage screen 7。Chimney filter 2 top is provided with steel plate for sealing water 8。
Embodiment
1, surveying setting-out
After blinding layer 14 construction, every one anchor point of 500 labelling on blinding layer 14, anchor point adopts paint mark, as the foundation of perforate punching。
2, punching
Pressure is adopted to reach more than 1.50MPa booster water pump, giant is connected by snakelike high-pressure rubber pipe, the body of a gun of giant is Φ 50 × 5mm seamless steel pipe, conical pipe that a sector hole mouth is Φ 16mm is welded as nozzle 10 in lower end, it is cased with the steel pipe of a segment length 150mm diameter of phi 610 × 13mm outside the body of a gun 9 and on deep-well 1 hole wall, rushes cutter pore-forming as punching cutter pipe 11, the water under high pressure sprayed by nozzle 10 and punching cutter pipe 11。
Giant being directed at position, well point, starts high-pressure hydraulic pump, hydraulic pressure control is at 1.5MPa, and the high-pressure spray at giant impacts undershoot cutter pipe 11 to start to sink, and constantly promotes and put down punching cutter pipe 11 by rushing the borehole wall of cutter pipe 11 punching cutter deep-well by rope。Empirically, for general containing sand clay, then each hoisting depth of punching cutter pipe 11 is put down at about 1 meter again, falls from about 1 meter, water under high pressure with under the die-cut effect of punching cutter pipe 11, be approximately within 25～30min time can to go out the hole of about 1 meter。If run into thicker pure clay in blanking process, the immersed tube time to extend, and now can take to increase the pressure of high-pressure hydraulic pump, to reach to accelerate the speed of 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 wall 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, during actual punching, should 500mm more than deeper in chimney filter 2 projected depth, during to prevent punching cutter pipe 11 from extracting, the part earth fall falls, and makes there are enough sandstones 3 bottom chimney filter 2。
Punching cutter pipe 11 should keep vertical when moving up and down, and makes the deep-well borehole wall keep vertical, if running into bigger stone when punchinging and fragment of brick should be removed in time, it is impossible to again can dig a well after shifting during removing。
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 is about 6 meters, chimney filter 2 bottom lengths 5.3m ranges for 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 drainage screen 13, and drainage screen 13 is the close order nylon wire of two-layer。After chimney filter 2 is made, first at the sandstone 3 that bottom pad a layer thickness is about 1 meter of deep hole 1, then chimney filter 2 centered vertical made is stood on the sandstone 3 bottom deep-well 1, after putting into chimney filter 2, filling sandstone 3 in chimney filter surrounding, chimney filter 2 top exceeds blinding layer 14 end face 200mm。Chimney filter 2 arranges the steel plate for sealing water 8 that 3mm is thick in blinding layer, and steel plate for sealing water 8 is the annular of width 150mm。Blinding layer 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 penetration, and prevents grogs from penetrating into the filter opening of chimney filter blocking chimney filter and the mesh of drainage screen。Back-up sand thickness is wanted uniformly, and speed wants fast, and back-up sand midway must not be interrupted, the soil in case the hole wall of deep-well collapses。
The packed height of sandstone 3, at least to exceed below chimney filter top 1～1.5m, and on it, 1～1.5m adopts clay joint filling, it is prevented that gas leakage。
4, draw water pressure release
Chimney filter 2 carries out examination after all installing and takes out。After all pumping equipments work well, the whole pipeline that draws water reaches the water yield of design, it is possible to put into normal pumping operation, it is ensured that water level is in blinding layer less than 14 500mm。
5, shut-in well
The Sealing Conditions of chimney filter, the earthing of blinding layer 14 top board completes, and structural design operating mode meet anti-floating require after, carry out chimney filter closure。Closure adopts armored concrete to block, when chimney filter met by reinforcing bar, tube wall is walked around in bending, it is positioned in the middle part of base plate outside chimney filter and welds the thick steel plate for sealing water of 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 and concreting carry out simultaneously。After load meets structural anti-buoyancy requirement, chimney filter side can close, and fills sand below bottom cushion, and base plate scope adopts C35 slightly expanded concrete to divide three times and builds, build 200mm thickness every time, 6, the suitable welded reinforcement head of chimney filter inwall, builds observation 3 days every time, non-leakage can build next layer, before third time is built, below base surface, in chimney filter, it is welded with 3mm steel plate and chimney filter full weld, is embedded in below third time concrete。If hydraulic pressure excessive employing diameter 20 catheter drainage, then slip casting。
6, surveillance and monitoring
Pressure release precipitation run duration, inspection well should at least be monitored once every day, and in water level abnormality situation, water-level observation frequency increases according to actual needs。Add up water level form in time every day according to water level monitoring form, form curves of water level, analyze water level to structure influence situation。
Water table measure according to relevant detection requirement such as exploration report, dewatering design file, precipitation scheme and dewatering construction organization design, should formulate monitoring monitoring scenarios, it is proposed to every alarming value boundary line。Monitoring record should specification, Monitoring Data should be accurate, and calculates arrangement in time, it is proposed to reasonable opinion, units concerned such as report design, management etc. after examination & verification。
Claims (2)
1. a pressure release anti-float method during high water level regional architecture foundation construction, it is characterised in that: the method is construction according to the following steps after blinding layer is constructed:
The first step, every 500m on blinding layer2One anchor point of scope internal labeling；
Second step, is connected giant with the pressure booster water pump more than 1.5Mpa, by giant at each anchor point punching cutter degree of depth vertical deep-well more than 6 meters；Giant is to form with steel pipe and Plate Welding；The body of a gun of giant is one section of external diameter is 50mm, and thickness is the seamless steel pipe of 5mm；The nozzle of giant is the conical pipe being welded on body of a gun lower end, and the exit inside diameter of conical pipe is 16mm；The body of a gun is externally provided with punching cutter pipe, and the external diameter of punching cutter pipe is determined according to the bore of deep-well, and punching cutter pipe is connected plate and welds with the body of a gun；In high pressure water flushing well process, constantly pipe is cut a hole in punching and promote 1 meter of then free-falling, by rushing the aperture of the outside diameter control deep-well of cutter pipe；
3rd step, bottom deep-well, first insert the sandstone of thickness 1 meter, then external diameter is centrally disposed on the sandstone bottom deep-well less than the chimney filter of deep-well bore, be then filled between chimney filter and deep-well with sandstone, the packed height of sandstone, from 1 meter of deep-well well head, is closed with clay on sandstone；Chimney filter top is from blinding layer end face 200mm；Chimney filter steel pipe is made；The length of chimney filter and external diameter are determined according to the degree of depth and the aperture of deep-well；Spacing between outer wall and the borehole wall of deep-well of chimney filter is 100-200mm, being filled with the fillter section that ranges for of sandstone outside chimney filter, it is 15mm that fillter section is evenly equipped with diameter, and spacing is the filtering holes of 150mm, fillter section is wrapped with drainage screen, and drainage screen adopts the close order nylon wire of two-layer；4th step, installing submersible pump in each chimney filter, the subsoil water penetrating into chimney filter is extracted out by the immersible pump started in each chimney filter simultaneously, makes groundwater level be in below blinding layer 500mm；
5th step, carries out construction foundation working on blinding layer, when the underground structure top board earthing of building foundation completes, and confirm underground structure can meet anti-floating require after, by chimney filter close。
2. the pressure release anti-floating system that method is constituted according to claim 1, including deep-well (1), it is characterized in that: in deep-well (1), be provided with chimney filter (2), it is provided with sandstone (3) between chimney filter (2) bottom and chimney filter (2) and deep-well (1), it is filled with clay (4) between chimney filter (2) and the deep-well (1) on sandstone (3) top, in chimney filter (2), is provided with immersible pump (5)；Chimney filter (2) bottom is evenly equipped with filter opening (6), and filter opening (6) is externally provided with drainage screen (7)；Chimney filter (2) top is provided with steel plate for sealing water (8)。
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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 CN104060636A (en) | 2014-09-24 |
| CN104060636B true CN104060636B (en) | 2016-06-22 |
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| 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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| KR100957673B1 (en) * | 2009-11-06 | 2010-05-12 | (주)라온이엔지 | Construction structure, relief well and constructing method thereof |
| CN202031102U (en) * | 2011-03-25 | 2011-11-09 | 中国二十冶集团有限公司 | Manual punching device for dewatering well point |
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