CN102002959B - Underground structure substrate water draw-off and distribution method thereof - Google Patents
Underground structure substrate water draw-off and distribution method thereof Download PDFInfo
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- CN102002959B CN102002959B CN201010598802.9A CN201010598802A CN102002959B CN 102002959 B CN102002959 B CN 102002959B CN 201010598802 A CN201010598802 A CN 201010598802A CN 102002959 B CN102002959 B CN 102002959B
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Abstract
A kind of underground structure substrate water draw-off and distribution method thereof, relate to underground building technical field of construction, and what solve is accelerate sluicing speed, slows down the technical problem that water pressure is lifted on substrate top.This device comprises main drain and strainer, and described main drain is divided into two sections, and its epimere is water conservancy diversion pipeline section, and its hypomere is sluicing pipeline section; The tube wall of described water conservancy diversion pipeline section is waterproof, and the tube wall of described sluicing pipeline section is permeable; Described strainer is central column, coaxial sleeve is located at the periphery of sluicing pipeline section, its inner ring cylinder and outer ring cylinder all permeable and be equipped with one deck filter screen, filter sand is filled with between inside and outside two-layer filter screen, its top encapsulates top board cap seal by a fluid-tight ring-type, and the inner ring of this encapsulation top board engages with the outer tube wall of sluicing pipeline section, bottom it and the lower end mouth of pipe of sluicing pipeline section by a fluid-tight package floor cap seal; The middle part of described water conservancy diversion pipeline section is arranged with-ring seal plate.Device provided by the invention, reliably can prevent piping under artesian water environment.
Description
Technical field
The present invention relates to underground building construction technology, particularly relate to the technology of a kind of underground structure substrate water draw-off and distribution method thereof.
Background technology
Conventional underground structure substrate sluicing method is before the operation of reinforcement foundation concrete floor (namely build plain concrete bed course and under the situation of non-colligation baseplate reinforcing bar), by the spacing preset and quantity in structure base top, the tubulose water draw-off of multiple external diameter at about 600mm is installed in the appropriate location of bottom surface absolute altitude, above the base plate by each water draw-off artesian water being guided to structure, thus eliminate or significantly slow down the top act effect of bearing capacity to structure base plate of buoyancy force of underground water or artesian water, prevent the integrally-built distortion of base plate or underground, cracking, ensure base arrangement and the integrally-built safety and stability of structure.
Each water draw-off when mounted, first digging one in the mounting points of water draw-off buries hole underground, bury the diameter 40cm larger than the diameter of tubulose water draw-off at the end, hole, hole or more underground, the filter sand layer of setting thickness is laid again at the end, hole, then in housing (steel pipe of a both ends open) the bottom tube chamber of water draw-off, steel grid is laid successively, wire gauze, geotechnique's gauze, after laying, the housing of water draw-off is vertically placed in and buries hole central authorities underground, filter sand is inserted again to setting height (being generally equivalent to the height of structure base plate bottom surface) in its tube chamber, and then lay geotechnological gauze successively at filter sand end face, wire gauze and steel grid, filter sand is filled to bottom 50cm higher than water draw-off housing or more finally in the periphery of water draw-off housing, more than filter sand end face build plain concrete, and it is floating with former plain concrete layer of building, so far namely water draw-off is accused and is installed.As can be seen here, the percolation path of conventional water draw-off is that artesian water enters above base plate by the end mouth of tubular shell after the cylindrical fillter section in housing upwards diafiltration to case top, and the water draw-off of this vertical diafiltration has following defect:
1) be the demand of each draw-off point position seepage action of ground water speed and seepage discharge of meeting given design spacing, the intended diameter of water draw-off housing (steel pipe) must comparatively large (mostly being about 600mm), and its material cost is higher;
2) water draw-off housing is owing to being subject to the restriction that caliber can not be excessive, each cloth base plate runoff area that can solve that sets up an office is less, therefore need larger cloth dot density, it settles cost higher, and also result in too much difficulty and inconvenience to the reinforcing steel bar laying of reinforced concrete floor;
3) filter screen of conventional tubulose water draw-off, filtrate does not fix operator guards, the top lifting force of the buoyancy that structure base plate bears or artesian water can easily exceed the filtering material resistance in housing, thus the filter screen filter sand in water draw-off housing is washed into the space above base plate, the housing of water draw-off (steel pipe) is made to become the piping passage of the underground water with certain lifting pressure, the base pit engineering in the top board being in underplate concrete curing time or underground reinforced concrete structure stage in progress is caused to the distortion of partial structurtes, the impact of infringement or underground structure overall construction intensity, even jeopardize the safety of foundation ditch.Such as partly descend in base pit engineering in District of Shanghai in recent years, the filtration that artesian water breaks through spilled water hole once occurred, carry silt along the serious dangerous situation of gushing in the hole of the tapping pipe of spilled water hole above base plate;
4) the effective seepage area of filtration percolation Structure due to Vertical dimension is less, and therefore the sluicing speed of existing water draw-off is also comparatively slow, and owing to being all filled with filter sand in whole main drain, therefore also cannot accelerate sluicing speed by water pump.
Summary of the invention
For the defect existed in above-mentioned prior art, technical problem to be solved by this invention is to provide a kind of material cost and settles cost low, sluicing speed is fast, reliably can prevent piping, efficiently slows down underground structure substrate water draw-off and the distribution method thereof that water pressure is lifted on substrate top under artesian water environment.
In order to solve the problems of the technologies described above, the distribution method of underground structure substrate water draw-off provided by the present invention, described underground structure substrate water draw-off, comprise main drain and strainer, described main drain is the straight tube of a vertically and upper and lower both ends open, described main drain is divided into two sections, and its epimere is water conservancy diversion pipeline section, and its hypomere is sluicing pipeline section;
The tube wall of described water conservancy diversion pipeline section is waterproof, and the tube wall of described sluicing pipeline section is permeable;
Described strainer is central column, coaxial sleeve is located at the periphery of sluicing pipeline section and is fixed, its inner ring cylinder and outer ring cylinder all permeable and be equipped with one deck filter screen, filter sand is filled with between inside and outside two-layer filter screen, its top encapsulates top board cap seal by a fluid-tight ring-type, and the inner ring of this encapsulation top board engages with the outer tube wall of sluicing pipeline section, bottom it and the lower end mouth of pipe of sluicing pipeline section by a fluid-tight package floor cap seal;
The middle part of described water conservancy diversion pipeline section is arranged with-plate face level and fluid-tight ring seal plate, and the inner ring of this seal plate engages with the outer tube wall of water conservancy diversion pipeline section;
The distribution method of described underground structure substrate water draw-off, it is characterized in that, concrete steps are as follows:
1) laying plain concrete bed course and at the bottom of the Foundation Pit of non-colligation baseplate reinforcing bar, by precalculated water draw-off bury underground between quantity and each water draw-off bury that spacing demarcates each water draw-off underground bury planar point position underground;
2) dig or be drilled with one by the absolute altitude preset, aperture and the degree of depth barrel-shapedly bury hole underground in each planar point position of burying underground, and at hole end place mat filtrate;
3) bury vertical center in hole underground lay a water draw-off provided by the present invention each, and tamp with the strainer periphery of filtrate by each water draw-off, until filtrate lid is crossed filter top and buried top, hole, hole underground, then repair within the scope of the top, hole burying hole underground and cheat and impaired plain concrete bed course because digging to bury underground;
Wherein, the main drain of each water draw-off is all vertical;
Wherein, the seal plate of each water draw-off all welds the outer wall being placed in main drain, and the absolute altitude of seal plate is positioned at the position, middle and lower part of structure back-plane design thickness;
4) main drain of each water draw-off is pushed up the capping of mouth cover plate, in case foreign material enter;
5) colligation baseplate reinforcing bar, builds base plate of foundation pit concrete, and after the precipitation facility barrier gate of foundation ditch is stopped transport, the main drain removing each water draw-off pushes up the cover plate of mouth, makes each water draw-off enter duty.
Further, water draw-off bury underground between quantity and each water draw-off bury distance computation underground time, first according to underground structure weight, the transmission coefficient of the underground reservoir of structure base areas and below thereof, with the weight sum and artesian water leaking into the underground water in structure, pressure balance is reached for benchmark to structure base top lifting force so that underground structure weight can be made, calculate required unit substrate area bleeder quantity per hour, calculate burying underground of water draw-off according to the unit substrate area bleeder quantity per hour that calculates again and bury spacing underground between quantity and each water draw-off.
Further, bury the absolute altitude in hole, aperture and the degree of depth underground to set according to structure base plate and to the position relationship between its water bearing ground with uplift pressure or artesian water top lifting force, can imbed with the strainer of water draw-off and have in the water bearing ground of uplift pressure or artesian water top lifting force for benchmark underground structure base plate.
Underground structure substrate water draw-off provided by the invention and distribution method thereof, the inner ring filter mesh layer laid by concentric circles, outer ring filter mesh layer, and in being filled in, the level of the filter sand composition pair of lamina filtration between the filter mesh layer of outer ring is to filtration seepage flow strainer, and the top of this strainer and bottom are all closed, underground water infiltrates sluicing pipeline section by this strainer level to filtration and sluices, owing to have employed horizontal filtering seepage flow mode, the effective seepage area of underground water is compared and adopts traditional water draw-off of vertical seepage flow to increase about 8 times, can be sluiced when underground structure base plate bears larger underground water top act pressure decompression fast, greatly reduce underground water top and lift pressure to base plate or the integrally-built disruptive threats of structure, and under the tube wall blocking function of sluicing pipeline section, eliminate the approach and condition that form piping, the passage that it becomes piping can be stopped completely, reliably piping can be prevented under artesian water environment, efficiently slow down substrate top and lift water pressure, and double-layer filter structure and stable built-in filter sand layer have double filtering feature, the seepage flow filtration reliably can guaranteed and normally play, the increase of the effective seepage area of underground water also reduces the material cost of water draw-off and settles cost low.In addition, water pump can also be laid in sluicing pipeline section, sluicing speed is accelerated by water pump, be conducive to the time that shortening osmotic pressure tends to balance, slow down the threat of water pressure to underlying structure safety or underground structure resistance to overturning, effectively prevent underground reinforced concrete structure thing quality problems such as recurring structure distortion, cracking in the building course not reaching design strength, even cause serious threat to whole underground construction and deep pit monitor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the underground structure substrate water draw-off of the embodiment of the present invention.
Detailed description of the invention
Illustrate below in conjunction with accompanying drawing and be described in further detail embodiments of the invention, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in.
As shown in Figure 1, a kind of underground structure substrate water draw-off that the embodiment of the present invention provides, comprise main drain and strainer 3, described main drain is the straight tube of a vertically and upper and lower both ends open, it is characterized in that: described main drain is divided into two sections, its epimere is water conservancy diversion pipeline section 1, and its hypomere is sluicing pipeline section 2;
The tube wall of described water conservancy diversion pipeline section 1 is waterproof, and the tube wall of described sluicing pipeline section 2 is permeable;
Described strainer 3 is in central column, coaxial sleeve is located at the periphery of sluicing pipeline section 2 and is fixed, its inner ring cylinder and outer ring cylinder all permeable and be equipped with one deck filter screen, filter sand is filled with between inside and outside two-layer filter screen, its top encapsulates top board cap seal 5 by a fluid-tight ring-type, and the inner ring of this encapsulation top board 5 engages with the outer tube wall of sluicing pipeline section 2, bottom it and the lower end mouth of pipe of sluicing pipeline section 2 by fluid-tight package floor 4 cap seal;
The middle part of described water conservancy diversion pipeline section 1 is arranged with-plate face level and fluid-tight ring seal plate 6, and the inner ring of this seal plate 6 engages with the outer tube wall of water conservancy diversion pipeline section 1.
In the embodiment of the present invention, described sluicing pipeline section is steel circular hole chimney filter, its tube wall offers the filter opening of multiple its tube wall through, during practical application, sluicing pipeline section also can be steel bridge-type chimney filter, can also be the circular hole chimney filter or bridge-type chimney filter be made up of other impermeable material.
In the embodiment of the present invention, described water conservancy diversion pipeline section and sluicing pipeline section are two independently straight tubes, described main drain to be engaged with sluicing pipeline section subtend by water conservancy diversion pipeline section and forms, in practical application, main drain also can be one whole straight tube, this straight tube is divided into two sections, its epimere forms water conservancy diversion pipeline section, its underpart tube wall is offered filter opening and forms sluicing pipeline section.
In the embodiment of the present invention, the radial spacing between the inner ring filter mesh layer of described strainer and its outer ring filter mesh layer is between 8 ~ 15cm.
In the embodiment of the present invention, the periphery of described strainer is filled out and is provided with one deck filter sand, and the outer peripheral face of strainer submerges in the filter sand layer of its periphery.
In the embodiment of the present invention, the filter screen of described strainer inner ring cylinder and outer ring cylinder should select nylon yarn filter screen that is corrosion-resistant, good toughness, also can take the circumstances into consideration the filter screen selecting iron wire, steel wire, copper wire or stainless steel.
In the embodiment of the present invention, with the pad net that one deck is permeable on the outer tube wall of described sluicing pipeline section, with the pad net that one deck is permeable on the outer filter of described strainer, the structure of described pad net can select trapezoidal solids net, taenidium connects stereoscopic graticule or reinforcing bar pad muscle etc., the material of pad net can select iron wire according to different design service lifes, steel wire, copper wire, the wires such as Stainless Steel silk, the Metal wire material diameter of pad net is different because of unlike material, its diameter range is usually between 0.5 ~ 1.2mm, the order number of pad net can be determined according to material and silk material diameter, usually between 8 ~ 12 orders, the thickness of pad net is usually between 6 ~ 10mm.
During embodiment of the present invention practical application, if sluicing pipeline section selects bridge-type chimney filter, pad net can not be set.
During embodiment of the present invention practical application, in described main drain, can submersible pump be placed, by the pumping relief of submersible pump, sluicing speed can be accelerated.
The distribution method of the underground structure substrate water draw-off that the embodiment of the present invention provides, it is characterized in that, concrete steps are as follows:
1) laying plain concrete bed course and at the bottom of the Foundation Pit of non-colligation baseplate reinforcing bar, by precalculated water draw-off bury underground between quantity and each water draw-off bury that spacing demarcates each water draw-off underground bury planar point position underground;
Wherein, the distance computation method of burying underground that water draw-off is buried underground between quantity and each water draw-off is prior art, these computational methods are first according to underground structure weight, the transmission coefficient of the underground reservoir of structure base areas and below thereof, with the weight sum and artesian water leaking into the underground water in structure, pressure balance is reached for benchmark to structure base top lifting force so that underground structure weight can be made, calculate required unit substrate area bleeder quantity per hour, calculate burying underground of water draw-off according to the unit substrate area bleeder quantity per hour that calculates again and bury spacing underground between quantity and each water draw-off, the transmission coefficient of underground reservoir is less, then the artesian water top lifting force that bears of structure base plate unit area is also larger, then required unit substrate area bleeder quantity per hour is also larger, water draw-off to bury spacing underground less, bury quantity underground also more,
2) dig or be drilled with one by the absolute altitude preset, aperture and the degree of depth barrel-shapedly bury hole underground in each planar point position of burying underground, and at hole end place mat filtrate;
Wherein, bury the absolute altitude in hole underground, the establishing method of aperture and the degree of depth is prior art, this establishing method sets according to structure base plate and to the position relationship between its water bearing ground with uplift pressure or artesian water top lifting force, can imbed have in the water bearing ground of uplift pressure or artesian water top lifting force for benchmark underground structure base plate with the strainer of water draw-off;
3) bury vertical center in hole underground and lay each the water draw-off that an embodiment of the present invention provides, and tamp with the strainer periphery of filtrate by each water draw-off, until filtrate lid is crossed filter top and buried top, hole, hole underground, then repair within the scope of the top, hole burying hole underground and cheat and impaired plain concrete bed course because digging to bury underground;
Wherein, the main drain of each water draw-off is all vertical;
Wherein, the seal plate of each water draw-off all welds the outer wall being placed in main drain, and the absolute altitude of seal plate is positioned at the position, middle and lower part of structure back-plane design thickness;
4) main drain of each water draw-off is pushed up the capping of mouth cover plate, in case foreign material enter;
5) colligation baseplate reinforcing bar, builds base plate of foundation pit concrete, and after the precipitation facility barrier gate of foundation ditch is stopped transport, the main drain removing each water draw-off pushes up the cover plate of mouth, makes each water draw-off enter duty.
When the embodiment of the present invention uses in the larger thin silt of transmission coefficient or gravelly sand stratum, effectively can lift the impact of pressure in the buoyancy force of underground water of sole plate and artesian water top by eliminating effect, and avoid Piping phenomenon occurs.
In the embodiment of the present invention, the ring plate of described seal plate annular flat board or inner circle foreign side, seal plate is installed on the middle part of structure base plate in foundation ditch, after the underplate concrete around water conservancy diversion pipeline section builds solidification, sealing effect that conduit section outer wall and underplate concrete shrink artesian water leakage between slit can be realized.
Claims (3)
1. the distribution method of a underground structure substrate water draw-off, described underground structure substrate water draw-off, comprise main drain and strainer, described main drain is the straight tube of a vertically and upper and lower both ends open, described main drain is divided into two sections, its epimere is water conservancy diversion pipeline section, and its hypomere is sluicing pipeline section;
The tube wall of described water conservancy diversion pipeline section is waterproof, and the tube wall of described sluicing pipeline section is permeable;
Described strainer is central column, coaxial sleeve is located at the periphery of sluicing pipeline section and is fixed, its inner ring cylinder and outer ring cylinder all permeable and be equipped with one deck filter screen, filter sand is filled with between inside and outside two-layer filter screen, its top encapsulates top board cap seal by a fluid-tight ring-type, and the inner ring of this encapsulation top board engages with the outer tube wall of sluicing pipeline section, bottom it and the lower end mouth of pipe of sluicing pipeline section by a fluid-tight package floor cap seal;
The middle part of described water conservancy diversion pipeline section is arranged with-plate face level and fluid-tight ring seal plate, and the inner ring of this seal plate engages with the outer tube wall of water conservancy diversion pipeline section;
The distribution method of described underground structure substrate water draw-off, it is characterized in that, concrete steps are as follows:
1) laying plain concrete bed course and at the bottom of the Foundation Pit of non-colligation baseplate reinforcing bar, by precalculated water draw-off bury underground between quantity and each water draw-off bury that spacing demarcates each water draw-off underground bury planar point position underground;
2) dig or be drilled with one by the absolute altitude preset, aperture and the degree of depth barrel-shapedly bury hole underground in each planar point position of burying underground, and at hole end place mat filtrate;
3) bury vertical center in hole underground lay underground structure substrate water draw-off described in one each, and tamp with the strainer periphery of filtrate by each water draw-off, until filtrate lid is crossed filter top and buried top, hole, hole underground, then repair within the scope of the top, hole burying hole underground and cheat and impaired plain concrete bed course because digging to bury underground;
Wherein, the main drain of each water draw-off is all vertical;
Wherein, the seal plate of each water draw-off all welds the outer wall being placed in main drain, and the absolute altitude of seal plate is positioned at the position, middle and lower part of structure back-plane design thickness;
4) main drain of each water draw-off is pushed up the capping of mouth cover plate, in case foreign material enter;
5) colligation baseplate reinforcing bar, builds base plate of foundation pit concrete, and after the precipitation facility barrier gate of foundation ditch is stopped transport, the main drain removing each water draw-off pushes up the cover plate of mouth, makes each water draw-off enter duty.
2. method according to claim 1, it is characterized in that: water draw-off bury underground between quantity and each water draw-off bury distance computation underground time, first according to underground structure weight, the transmission coefficient of the underground reservoir of structure base areas and below thereof, with the weight sum and artesian water leaking into the underground water in structure, pressure balance is reached for benchmark to structure base top lifting force so that underground structure weight can be made, calculate required unit substrate area bleeder quantity per hour, calculate burying underground of water draw-off according to the unit substrate area bleeder quantity per hour that calculates again and bury spacing underground between quantity and each water draw-off.
3. method according to claim 1, it is characterized in that: bury the absolute altitude in hole, aperture and the degree of depth underground and set according to structure base plate and to the position relationship between its water bearing ground with uplift pressure or artesian water top lifting force, can imbed with the strainer of water draw-off and have in the water bearing ground of uplift pressure or artesian water top lifting force for benchmark underground structure base plate.
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| CN201010598802.9A CN102002959B (en) | 2010-12-21 | 2010-12-21 | Underground structure substrate water draw-off and distribution method thereof |
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| CN103758144B (en) * | 2014-02-19 | 2015-07-22 | 中亿丰建设集团股份有限公司 | Tube well used for unwatering and pressure-reducing drainage and drainage method of tube well |
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| CN105625482B (en) * | 2016-03-21 | 2017-11-21 | 上海长凯岩土工程有限公司 | Pattern and its application on underground engineering sole plate |
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| CN113431628A (en) * | 2021-04-13 | 2021-09-24 | 西南交通大学 | Three-dimensional dewatering method for quicksand stratum |
| CN113863344A (en) * | 2021-09-29 | 2021-12-31 | 中铁十八局集团有限公司 | Casing and well pipe integrated dewatering well device and construction method thereof |
| CN113914927A (en) * | 2021-10-29 | 2022-01-11 | 同济大学 | Combined film bag type gravel pasting filtering and water draining device for high-water-pressure tunnel |
| CN116005730A (en) * | 2022-12-09 | 2023-04-25 | 中建八局第二建设有限公司 | Basement bottom plate water drainage hole structure and construction method thereof |
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