CN110318410A - A kind of deep basal pit chance artesian water is prominent to gush decompression drought stress construction method - Google Patents

Abstract

The present invention relates to the technical field of deep foundation pit construction, it is related to a kind of deep basal pit and meets that artesian water is prominent to gush decompression drought stress construction method, comprising the following steps: S1: hole drilling gushes place, progress drilling well in deep foundation pit；S2: launching filtrate packet in hole, filtrate packet is launched into wellhole and presses bottom；S3: making and hangs well casing, and well casing is integrally hung in wellhole；S4: filler between hole wall and the borehole wall；S5: filtrate packet is launched in well casing and is drawn water, filtrate packet is put into well casing bottom, immersible pump is then transferred, the artesian water in well casing is extracted out；S6: shut-in well closes wellhole, carries out grouting filling consolidation process to foundation soil.The present invention has the effect that so that artesian water is temporarily stored in wellhole, and control water is carried out to the artesian water at prominent gush, after artesian water is constantly extracted out, then wellhole closed, to reduce artesian water outburst amount in the case where high pressure, big yield, control water effect is improved.

Description

A kind of deep basal pit chance artesian water is prominent to gush decompression drought stress construction method

Technical field

The present invention relates to the technical fields of deep foundation pit construction, meet prominent gush of artesian water more particularly, to a kind of deep basal pit and depressurize control Water process construction method.

Background technique

In deep-foundation pit engineering, depth is big, and range is wide due to digging under deep basal pit, cause the prominent probability gushed of bottom artesian water compared with Greatly.When the gravity pressure of the following impervious stratum in deep basal pit bottom surface is less than lower part artesian pressure, it will cause deep basal pit bottom Uplift of soil destroys and sprays water simultaneously, gushes sand；Or work as the closure not yet in effect of geology exploratory hole, and after deep pit digging, artesian water Under head pressure effect, is carried by the exploratory hole not blocked effectively and gushed on a large amount of silt particles.Foundation Pit Pouring processing difficulty Greatly, it and deals with improperly and will cause serious consequence.And in such a way that high dam well-digging is built in traditional backfill earthwork, constructing operation is multiple It is miscellaneous, and it is ineffective to control water.

The Chinese invention patent of Publication No. CN104631478A, disclose a kind of deep building pit piping rapid plugging method and Device injects cement slurry into geotechnical fabric bag by mudjack after geotechnical fabric bag is sent into ground impermeable stratum along piping path, Geotechnical fabric bag starts to expand, and forms bottle stopper effect and blocks piping path, and piping closure can be completed after cement slurry sets.

Prior art among the above has the following deficiencies: that the artesian water in deep basal pit is prominent and gushes situation, often high Pressure, the artesian water situation of big yield, if being blocked in the manner described above, in the case where high pressure big yield, when applying Piping could be blocked, had at this time a large amount of towards injecting cement slurry in geotechnical fabric bag, and after waiting cement slurry sets by worker person Artesian water is gushed out, and drought stress effect is poor.

Summary of the invention

Prominent gush of artesian water, which is met, the object of the present invention is to provide a kind of deep basal pit depressurizes drought stress construction method, it can be to height Pressure, the artesian water situation of big yield carry out drought stress, reduce the outburst amount of artesian water, improve control water effect.

It is prominent that above-mentioned technical purpose of the invention has the technical scheme that a kind of deep basal pit meets artesian water Gush decompression drought stress construction method, comprising the following steps:

S1: hole drilling gushes place in deep foundation pit, drilling well is carried out, so that artesian water is poured in wellhole；

S2: filtrate packet is launched in hole and proposes drilling rod immediately after pore-forming reaches designed elevation, filtrate packet pressure is launched into wellhole Bottom；

S3: making and hangs well casing, and well casing is integrally hung in wellhole, and the diameter of well casing is less than the diameter of wellhole, hole wall There are gaps between the borehole wall；

S4: filler between hole wall and the borehole wall launches filler material to the gap between hole wall and the borehole wall；

S5: launching filtrate packet and draw water, filtrate packet is put into well casing bottom, immersible pump is then transferred in well casing, will be in well casing Artesian water extraction；

S6: shut-in well closes wellhole, carries out grouting filling consolidation process to foundation soil.

By using above-mentioned technical proposal, first at deep foundation pit gushes, drill, at this time artesian water will pour in In wellhole, filtrate packet then being launched in wellhole, on the one hand can slow down artesian water in well and gush out, base on the other hand can also be stopped native Middle silt particle reduces and is lost；Then well casing is hung to wellhole, for the ease of transferring well casing to wellhole, well casing and hole wall Between there are gaps, and by launching filtrate between hole wall and the borehole wall for gap filling；Launch filtrate in well casing again at this time Packet, and extracted out the artesian water in well casing by immersible pump, finally wellhole is closed, and to embankment consolidation, Ci Zhongshi Work method first can make artesian water be temporarily stored in wellhole, and carry out control water to the artesian water at prominent gush, and artesian water is continuous After extraction, then wellhole closed, to reduce artesian water outburst amount in the case where high pressure, big yield, improves control water effect.

The further setting of the present invention are as follows: the S1 step the following steps are included:

S1.1: Temporary Cofferdam carries out water blocking by cofferdam, and determines drilling well position；

S1.2: a side is gushed prominent, several relief wells are set, and relief well is connected to by gutter with wellhole upper end, and is removed Cofferdam；

S1.3: prominent gush locates embedded casing, gushes place in deep foundation pit, positions to casing hole, then buries and fix casing；

S1.4: the soil layer in casing is punched by drilling machine.

The artesian water gushed out is stopped, while material after Temporary Cofferdam is set by using above-mentioned technical proposal Material, mechanical equipment is marched into the arena, personnel march into the arena, and gushes a side setting relief well prominent, the artesian water gushed out is enabled to pass through draining Ditch flows in relief well, reduces discharge pressure；Then locate embedded casing in prominent gush, gushes a little neighbouring soil layer to prominent and add Gu；It drills finally by drilling machine to the soil layer in casing, forms wellhole.

The further setting of the present invention are as follows: the relief well distance in the S1.2 step, which is dashed forward, gushes point 5m, and each prominent Gushing need to arrange 2 mouthfuls or more of relief well, and multiple relief wells, which are evenly spaced apart to be arranged in, gushes a little circle for the center of circle with prominent Zhou Shang.

By using above-mentioned technical proposal, the position of relief well is determined according to water and landform, between relief well is uniform Every setting, enable to artesian water that can equably flow in relief well, thus reduce a possibility that artesian water pours out, And relief well distance dashes forward and gushes a little 5 meters, enables to artesian water that can comparatively fast more smoothly flow in relief well.

The further setting of the present invention are as follows: the S1.3 step the following steps are included:

S1.3.1: production casing is rolled using thick steel plate, and casing internal diameter is greater than well diameter；

S1.3.2: the positioning of casing hole a little is the center of circle in wellhole position sideline Wai Chu with prominent gush, and squeezes into a timber every 90 °, and Iron nail is nailed on timber, four timbers form a square control zone, with the iron nail on filament connection angle steel joint timber, school Just and adjusting small iron nail makes two line intersection points be located at hole location center, draws a diameter as center of circle bracing wire using hole location center and compares casing The circle of the big 10cm of outer diameter spreads gray line as casing and cheats excavation control line；

S1.3.3: embedded casing, casing hole is using manually combining small excavator to excavate, and hole is deep should to be not less than 1.5m, and casing hole is dug Casing is placed after good, and the gap on the outside of casing between casing hole is backfilling and compacted with clay.

By using above-mentioned technical proposal, casing is set centered on prominent gush a little, is enabled to when creeping into wellhole, it can Wellhole is located at central point, enable artesian water preferable pour in well, and be also convenient for the later period shut-in well, optimization control water effect Fruit.

The further setting of the present invention are as follows: the S3 step the following steps are included:

S3.1: production well casing, by wall thickness be 60~100mm steel pipe be fabricated to both ends have permeable hole well casing, well casing tube bottom, Tube top is opening, and well casing length determines that well casing tube top is higher than Deep Foundation Pit bottom according to artesian water buried depth；

S3.2: by crane, well casing integrally being hung to wellhole, and make well casing enter confined aquifer 3~ 5m。

By using above-mentioned technical proposal, when well casing is inserted into artesian aquifer, preferable support effect is enough kept, and Well casing integral manufacturing is more convenient, and making material is simple me, convenient for field fabrication.

The further setting of the present invention are as follows: the S4 step the following steps are included:

S4.1: temporarily controlling water, towards well casing in transfer sewage pump, reduce the water pressure between hole wall and the borehole wall；

S4.2: capping temporarily covers well casing mouth；

S4.3: filler uniformly uses spade blanking from well casing surrounding simultaneously, gutter bottom absolute altitude is continuously filled to from shaft bottom, filler is complete Lift sewage pump in pipe after.

After the completion of well casing is hung, artesian water outside upper out of well casing can gush, at this time to feed intake between tube wall and hole wall may It is difficult to.By using above-mentioned technical proposal, after placing completion tubular, into well casing, lower amplifying power sewage pump draws water, with Reduce the water pressure between tube wall and hole wall, it is ensured that smoothly feed intake between hole wall and tube wall, while well head temporarily covered when filler with Anti- filtrate filling is wherein.

The further setting of the present invention are as follows: the S5 step the following steps are included:

S5.1: launching filtrate packet in well casing, towards well casing in launch filtrate packet for stopping silt particle；

S5.2: drawing water, and transfers in immersible pump to well, and the artesian water in well casing is extracted out；

S5.3: horizontal well point is embedded, and after relief well is normally discharged, the gutter dug when to drilling is cleared up, and will fill In material filling gutter, and embedded Horizontal filter pipe, Horizontal filter pipe one end connect vacuum pump, form horizontal well point, and horizontal well point will The prominent each relief well of surrounding arrangement that gushes all is connected to, and forms a control water system.

By using above-mentioned technical proposal, filtrate packet is launched in well casing, so that the artesian water of extraction does not carry silt particle, and After being discharged a period of time in order to prevent pipe well top well screen silts up or artesian pressure is excessive, between tube wall and hole wall on gush Artesian water all cannot enter well casing by top chimney filter, horizontal well point will gush between each decompression borehole wall and tube wall and not and When foundation pit pumped out by the underground water that top chimney filter enters well casing, so that decompression control water system water level is maintained at foundation pit bottom surface or less 0.5m。

The further setting of the present invention are as follows: the filtrate packet includes the first filter packet, the second filter packet, third filter packet；

The first filter packet is made by using 60 mesh filter screen packet partial size 10~15mm stone filtrates；

The second filter packet is made by using 80 mesh filter screen packet partial size 5~10mm stone filtrates；

The third filter packet is by using 100 mesh~120 mesh filter screen packet partial size 5mm mineral granule below and/or quartz sand filter media It is made；

Filtrate is the 60%~70% of filter bag capacity in the first filter packet, second filter wrap, third filter is wrapped；

In the S2 step, launched using the first filter packet, dispensing total height is 0.3~0.7m；

In the S5.1 step, the first filter packet, the second filter packet, third filter packet are launched from bottom to top in well casing, and launch total high Degree is 1m, 1m, 1~3m.

By using above-mentioned technical proposal, the first filter packet, the second filter, which wrap, the particle diameter of filter medium in third filter packet is descending is set It sets, to the artesian water extracted out in well casing while stopping, it can be filtered, what reduction silt particle was taken out of together can Energy property, while the filtrate in filtrate packet is the 60%~70% of filter bag capacity, enables to filtrate while filling filter bag, Gap also will be present between each other, pass through convenient for artesian water.

The further setting of the present invention are as follows: in the S5.1 step, after the first filter packet is launched with the second filter packet, When launching third filter packet, decentralization immersible pump draws water after launching the third filter packet of 0.5m high every time, is still after a period of time of such as drawing water The muddy water for silt particle is taken, then lifts the third filter packet that immersible pump throws 0.5m high again, repeatedly, until immersible pump extraction is clear Until water.

By using above-mentioned technical proposal, by being continuously increased third filter packet, so that the artesian water extracted out in well casing is kept Limpid state reduces the loss of foundation soil.

The further setting of the present invention are as follows: the S6 step the following steps are included:

S6.1: bottom plate sealing welds water-proof wing-ring on one end that well casing is higher than wellhole, and the water-proof wing-ring is equipped with twice, with Casting concrete in gap on the inside of casing between well casing outer wall afterwards, forms bottom plate, and upper track water-proof wing-ring is located at base top 100mm under face, lower road water-proof wing-ring are located at 100mm on bottom plate bottom surface；

S6.2: the well casing for being located at plate top surface or less 100mm is cut off, and propose immersible pump, top is had valve by shut-in well control water Door lower part is that the control water steel pipe of chimney filter is placed in well casing, connects vacuum pump at an upper portion thereof and draws water, by water level control in well Bottom plate bottom 1.0m into wellhole hereinafter, backfill at coarse sand gravel to bottom plate bottom 1.0m at this time, and then steel plate is isolated in placement, then It is poured under plate top surface at 200mm with plain concrete, valve is closed after concrete initial set, casting concrete adds to plate top surface 100mm The closure steel plate flushed with upper track water-proof wing-ring is welded, is finally poured with microdilatancy concrete flat；

S6.3: grouting and reinforcing carries out grouting filling consolidation process to foundation soil.

By using above-mentioned technical proposal, first the gap between well casing and casing is poured, and if there are also overflows Artesian water will water-proof wing-ring stopped；The artesian water in wellhole is persistently extracted by controlling water steel pipe, is controlled it, is led to It crosses coarse sand gravel to be filled, then be poured by element concrete, blocked finally by steel plate is blocked, microdilatancy concrete can Keep preferable that plugging effect reduces the loss of foundation soil finally to foundation soil progress grouting filling consolidation process.

In conclusion advantageous effects of the invention are as follows:

1. be first temporarily stored in artesian water in wellhole, and control water is carried out to the artesian water at prominent gush, after hanging well casing, by filling out Material, which forms artesian water, to be stopped, and artesian water is constantly extracted out, then wellhole is closed, to reduce in high pressure, big yield In the case of artesian water outburst amount, improve control water effect；

2. can be according to prominent water burst pressure, water yield size arrangement a bite or more mouthfuls of relief wells, and each well is connected to using horizontal well point, Convenient for dynamically controlling water, later period shut-in well is simple, does not influence subsequent construction, effect on environment is small；

3. be common material and machinery used in construction, convenient for buying and lease, can be gushed after generation in the short time prominent Organizing construction, short time limit, constructing operation are simple.

Detailed description of the invention

Fig. 1 is the schematic diagram for creeping into wellhole；

Fig. 2 is the schematic diagram that the first filter packet is launched in wellhole；

Fig. 3 is the schematic diagram hung well casing to wellhole；

Fig. 4 is to the schematic diagram for carrying out interim control water in well casing；

Fig. 5 is the schematic diagram launching filtrate packet in well casing with drawing water；

Fig. 6 is the schematic diagram for burying horizontal well point connection relief well；

Fig. 7 is the structural schematic diagram of well casing；

Fig. 8 is the schematic diagram of bottom plate sealing；

Fig. 9 is the schematic diagram controlled water steel pipe and carry out control water；

Figure 10 is the schematic diagram of shut-in well.

Appended drawing reference: 100, deep basal pit；110, relief well；111, gutter；113, wellhole；114, Horizontal filter pipe；115, Immersible pump；116, sewage pump；120, casing；131, the first filter packet；132, the second filter packet；133, third filter packet；140, well casing； 141, chimney filter；142, stopped pipe；143, permeable hole；144, water-proof wing-ring；145, bottom plate；146, water steel pipe is controlled；147, steel plate is isolated； 151, filler material；152, plain concrete；153, microdilatancy concrete；154, coarse sand gravel；155, steel plate is blocked.

Specific embodiment

Below in conjunction with attached drawing, invention is further described in detail.

A kind of deep basal pit chance artesian water is prominent to gush decompression drought stress construction method, comprising the following steps:

S1: referring to Fig.1, wellhole 113 is crept into, and is dashed forward in deep basal pit 100 and is gushed place, drilling well is carried out, so that artesian water is poured in wellhole 113 It is interior: specifically includes the following steps:

S1.1: Temporary Cofferdam carries out water blocking by cofferdam, and determines drilling well position, and material, mechanical equipment are marched into the arena, personnel march into the arena, Major mechanical of constructing is that GPS-10 type slewing drilling machine or similar specification drilling machine, Foundation Pit Pouring are normally at 100 bottom of deep basal pit, Narrow field, therefore normal condition lower prominent gushes 1~2 equipment of a little marching into the arena；

S1.2: a side is gushed prominent, several relief wells 110 are set, relief well 110 passes through gutter 111 and 113 upper end of wellhole Connection, and removes cofferdam, and wherein relief well 110 gushes point 5m apart from prominent, and each prominent gush need to arrange 2 mouthfuls or more of relief well 110, the arrangements such as 2 wells, 4 wells, 6 wells are typically provided, multiple relief wells 110 are evenly spaced apart setting and are gushed a little with prominent for the center of circle Circumference on, convenient for artesian water Uniform Flow into relief well 110；

S1.3: prominent gush locates embedded casing 120, gushes place deep basal pit 100 is prominent, positions to casing hole, then buries and admittedly Determine casing 120；Specifically includes the following steps:

S1.3.1: production casing 120, casing 120 are rolled using the steel plate of thickness 8mm, and 120 internal diameter of casing is greater than wellhole 113 Diameter, the diameter of wellhole 113 is 800mm in the present embodiment, and the diameter of casing 120 is 900mm, and general casing hole depth is 1.5m, the height of casing 120 is 1.8m in this example；

S1.3.2: the positioning of casing hole is the center of circle outside 113 sideline 0.5m of wellhole with prominent gush a little, a side is squeezed into every 90 ° Timber, and iron nail is nailed on timber, four timbers form a square control zone, on filament connection angle steel joint timber Iron nail, correct and adjusting small iron nail make two line intersection points be located at hole location center, using hole location center as center of circle bracing wire draw one Diameter circle 10cm bigger than 120 outer diameter of casing spreads gray line as casing 120 and cheats excavation control line；

S1.3.3: embedded casing 120, using manually small excavator being combined to excavate, hole is deep should to be not less than 1.5m, this implementation in casing hole Casing cheats depth 1.5m in example, and casing 120 is placed after digging well in casing hole, by the gap use between 120 outside of casing and casing hole Clay is backfilling and compacted, and casing 120 is higher by 10~20cm of place ground；

S1.4: punching the soil layer in casing 120 by drilling machine, and using GPS10 type slewing drilling machine pore-forming, when pore-forming is adopted With the thin mud retaining wall of specific gravity 1.05~1.10.

S2: filtrate packet is launched referring to Fig. 2, in hole and proposes drilling rod, Xiang Jingkong 113 immediately after pore-forming reaches designed elevation Interior dispensing filtrate packet presses bottom, and used filtrate packet includes first the 131, second filter of filter packet packet 132, third filter packet in the present embodiment 133；

First filter packet 131 is made by using 60 mesh filter screen packet partial size 10~15mm stone filtrates；

Second filter packet 132 is made by using 80 mesh filter screen packet partial size 5~10mm stone filtrates；

Third filter packet 133 is by using 100 mesh~120 mesh filter screen packet partial size 5mm mineral granule below and/or quartz sand filter media It is made；

Filtrate is the 60%~70% of filter bag capacity in first the 131, second filter of filter packet packet 132, third filter packet 133；

It in S2 step, is launched using the first filter packet 131, and launching total height is 0.3~0.7m.

S3: referring to Fig. 3, Fig. 7, making and hang well casing 140,140 entirety of well casing is hung in wellhole 113, and well casing 140 diameter is less than the diameter of wellhole 113, and there are gaps between hole wall and the borehole wall；Specifically includes the following steps:

S3.1: the steel pipe that wall thickness is 60~100mm is fabricated to the well casing 140 that both ends have permeable hole 143 by production well casing 140, Well casing 140 includes the chimney filter 141 with permeable hole 143 and the stopped pipe 142 without permeable hole 143, the permeable hole 143 on chimney filter 141 Diameter is 30mm, and the strainer of 100 mesh is enclosed on chimney filter 141, and the length of chimney filter 141 is 3m to 5m, 140 tube bottom of well casing, pipe Top is opening, and the diameter of well casing 140 is 400mm in the present embodiment, and 140 length of well casing is determined according to artesian water buried depth, well 140 tube top of pipe is higher than deep basal pit 100 and cheats bottom at least 400mm；

S3.2: by crane, 140 entirety of well casing is hung to wellhole 113, and well casing 140 is contained into artesian water 3~5m of water layer.

S4: referring to Fig. 4, filler between hole wall and the borehole wall launches filler material 151 to the gap between hole wall and the borehole wall；Tool Body includes the next steps:

S4.1: temporarily controlling water, towards well casing 140 in transfer sewage pump 116, reduce the water pressure between hole wall and the borehole wall；

S4.2: capping, by 140 mouthfuls of temporarily cappings of well casing；

S4.3: filler uniformly uses spade blanking from 140 surrounding of well casing simultaneously, and filler material 151 uses the clean quartz sand of 1~5mm Or mineral granule, filtrate should carry out screening cleaning, undesirable filtrate must not exceed the 5% of total amount, and the psephicity of filtrate is answered Preferably, angular gravel concentration cannot be excessive, and filtrate cannot contain soil and sundries, and 111 bottom of gutter mark is continuously filled to from shaft bottom Height, filler lift sewage pump 116 in pipe after the completion.

S5: filtrate packet is launched referring to Fig. 5, in well casing 140 and is drawn water, filtrate packet is put into 140 bottom of well casing, under subsequent Immersible pump 115 is put, the artesian water in well casing 140 is extracted out；Specifically includes the following steps:

S5.1: launching filtrate packet in well casing 140, towards well casing 140 in launch filtrate packet for stopping silt particle, in well casing 140 First the 131, second filter of filter packet packet 132, third filter packet 133 are launched from bottom to top, and launching total height is 1m, 1m, 1~3m；

S5.2: drawing water, and transfers in immersible pump 115 to well, and the artesian water in well casing 140 is extracted out, when the first filter packet 131 and second After filter packet 132 is launched, when launching third filter packet 133, diving is transferred after launching the third filter packet 133 of 0.5m high every time Pump 115 draws water, and still to take the muddy water for silt particle after a period of time of such as drawing water, then lifts immersible pump 115 throws 0.5m high again the Three filter packets 133, repeatedly, until immersible pump 115 extracts clear water out；

S5.3: referring to Fig. 6, horizontal well point is embedded, after relief well 110 normally water outlet, the gutter 111 that is dug when to drilling into Row cleaning, filler material 151 is inserted in gutter 111, and embedded Horizontal filter pipe 114,114 one end of Horizontal filter pipe connect vacuum Pump, forms horizontal well point, and horizontal well point gushes all connections of each relief well 110 that a surrounding is arranged for prominent, forms a control water system System, by each underground water pump drainage for depressurizing and being gushed between borehole wall and tube wall and entering well casing 140 by top chimney filter 141 not in time Foundation pit out makes decompression control water system water level be maintained at foundation pit bottom surface or less 0.5m.

S6: shut-in well closes wellhole 113, carries out grouting filling consolidation process to foundation soil；Specifically include following step It is rapid:

S6.1: referring to Fig. 8,145 sealing of bottom plate welds water-proof wing-ring 144, sealing on one end that well casing 140 is higher than wellhole 113 Wing ring 144 is combined by two semicircle steel loops and is formed, and half rounds ring width is 300mm, and thickness is not less than 6mm, water-proof wing-ring 144 Equipped with twice, and upper track water-proof wing-ring 144 and 144 spacing of lower road water-proof wing-ring are no less than 300mm, then in 120 inside of casing Casting concrete in gap between 140 outer wall of well casing, forms bottom plate 145, and upper track water-proof wing-ring 144 is located at the top of bottom plate 145 100mm under face, lower road water-proof wing-ring 144 are located at 100mm on 145 bottom surface of bottom plate；

S6.2: referring to Fig. 9, Figure 10, shut-in well control water is cut off the well casing 140 for being located at 145 top surface of bottom plate or less 100mm, and propose Top is placed in well casing 140 with valve lower part with the control water steel pipe 146 of permeable hole 143, on it by immersible pump 115 Portion's connection vacuum pump draws water, by 145 bottom 1.0m of water level control bottom plate in well hereinafter, backfilling coarse sand into wellhole 113 at this time At gravel 154 to 145 bottom 1.0m of bottom plate, isolation steel plate 147 is then placed, is then poured under 145 top surface of bottom plate with element concrete 152 At 200mm, valve is closed after concrete initial set, 100mm under casting concrete to 145 top surface of bottom plate is welded with and upper track water-proof wing The closure steel plate 155 that ring 144 flushes finally is poured with microdilatancy concrete 153 flat；

S6.3: grouting and reinforcing gushes on a certain amount of silt particle because 100 water burst of deep basal pit can carry, and hole bottom foundation soil has certain It is lost, therefore after the completion of relief well 110 is constructed, the embedded Grouting Pipe of position drilling need to be gushed prominent before bottom plate 145 pours, to bottom plate After the completion of 145 pour, grouting filling consolidation process is carried out to foundation soil.

The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it It is interior.

Claims (10)

1. a kind of deep basal pit is met, artesian water is prominent to gush decompression drought stress construction method, it is characterised in that: the following steps are included:

S1: wellhole (113) drilling dashes forward in deep basal pit (100) and gushes place, drilling well carried out, so that artesian water is poured in wellhole (113) It is interior；

S2: launching filtrate packet in hole, after pore-forming reaches designed elevation, propose drilling rod immediately, launch filtrate in Xiang Jingkong (113) Packet pressure bottom；

S3: making and hangs well casing (140), well casing (140) is integrally hung in wellhole (113), and the diameter of well casing (140) Less than the diameter of wellhole (113), there are gaps between hole wall and the borehole wall；

S4: filler between hole wall and the borehole wall launches filler material (151) to the gap between hole wall and the borehole wall；

S5: filtrate packet is launched in well casing (140) and is drawn water, filtrate packet is put into well casing (140) bottom, immersible pump is then transferred (115), the artesian water in well casing (140) is extracted out；

S6: shut-in well closes wellhole (113), carries out grouting filling consolidation process to foundation soil.

2. a kind of deep basal pit according to claim 1 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: the S1 step the following steps are included:

S1.1: Temporary Cofferdam carries out water blocking by cofferdam, and determines drilling well position；

S1.2: a side is gushed prominent, several relief wells (110) are set, relief well (110) passes through gutter (111) and wellhole (113) upper end is connected to, and removes cofferdam；

S1.3: prominent gush locates embedded casing (120), gushes place deep basal pit (100) are prominent, positions to casing hole, subsequent to bury With fixed casing (120)；

S1.4: the soil layer in casing (120) is punched by drilling machine.

3. a kind of deep basal pit according to claim 2 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists Point 5m is gushed in: the relief well (110) in S1.2 step distance is prominent, and each prominent gush need to arrange 2 mouthfuls or more Relief well (110), multiple relief wells (110), which are evenly spaced apart to be arranged in, is gushed a little with prominent on the circumference in the center of circle.

4. a kind of deep basal pit according to claim 2 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: the S1.3 step the following steps are included:

S1.3.1: production casing (120) is rolled using thick steel plate, and casing (120) internal diameter is greater than wellhole (113) diameter；

S1.3.2: the positioning of casing hole is the center of circle in wellhole (113) position sideline Wai Chu with prominent gush a little, a wood is squeezed into every 90 ° Stake, and iron nail is nailed on timber, four timbers form a square control zone, on filament connection angle steel joint timber Iron nail, corrects and adjusting small iron nail makes two line intersection points be located at hole location center, draws one directly by center of circle bracing wire of hole location center Diameter circle 10cm bigger than casing (120) outer diameter spreads gray line as casing and cheats excavation control line；

S1.3.3: embedded casing (120), using manually small excavator being combined to excavate, hole is deep should to be not less than 1.5m, casing in casing hole Good placement casing (120) later is dug in hole, and the gap on the outside of casing (120) between casing hole is backfilling and compacted with clay.

5. a kind of deep basal pit according to claim 4 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: the S3 step the following steps are included:

S3.1: the steel pipe that wall thickness is 60~100mm is fabricated to the well casing that both ends have permeable hole (143) by production well casing (140) (140), well casing (140) tube bottom, tube top are opening, and well casing (140) length is determined according to artesian water buried depth, well casing (140) pipe It rises and cheats bottom in deep basal pit (100)；

S3.2: by crane, well casing (140) is integrally hung to wellhole (113), and well casing (140) are entered and are held Press 3~5m of water water-bearing layer.

6. a kind of deep basal pit according to claim 1 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: the S4 step the following steps are included:

S4.1: temporarily controlling water, towards the interior water pressure transferred sewage pump (116), reduce between hole wall and the borehole wall of well casing (140)；

S4.2: capping temporarily covers well casing (140) mouth；

S4.3: filler uniformly uses spade blanking from well casing (140) surrounding simultaneously, and gutter (111) bottom mark is continuously filled to from shaft bottom Height, filler lift sewage pump in pipe (116) after the completion.

7. a kind of deep basal pit according to claim 1 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: the S5 step the following steps are included:

S5.1: launching filtrate packet in well casing (140), towards the interior filtrate packet launched for stopping silt particle of well casing (140)；

S5.2: drawing water, and in decentralization immersible pump (115) to well, the artesian water in well casing (140) is extracted out；

S5.3: horizontal well point is embedded, and after relief well (110) normally water outlet, the gutter (111) dug when to drilling carries out clear Reason, filler material (151) filling gutter (111) is interior and embedded Horizontal filter pipe (114), the connection of Horizontal filter pipe (114) one end is true Sky pump forms horizontal well point, and the prominent each relief well (110) of surrounding arrangement that gushes all is connected to by horizontal well point, forms a control Water system.

8. a kind of deep basal pit according to claim 7 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: the filtrate packet includes the first filter packet (131), the second filter packet (132), third filter packet (133)；

The first filter packet (131) is made by using 60 mesh filter screen packet partial size 10~15mm stone filtrates；

The second filter packet (132) is made by using 80 mesh filter screen packet partial size 5~10mm stone filtrates；

The third filter packet (133) is by using 100 mesh~120 mesh filter screen packet partial size 5mm mineral granule below and/or quartz Sand filtering material is made；

The first filter packet (131), the second filter packet (132), third filter packet (133) interior filtrate are filter bag capacity 60%~70%；

It in the S2 step, is launched using the first filter packet (131), dispensing total height is 0.3~0.7m；

In the S5.1 step, the first filter packet (131), the second filter packet (132), third are launched from bottom to top in well casing (140) Filter packet (133), and launching total height is 1m, 1m, 1~3m.

9. a kind of deep basal pit according to claim 8 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: in the S5.1 step, after the first filter packet (131) is launched with the second filter packet (132), launching third filter packet (133) when, the third filter packet (133) for launching 0.5m high every time transfers immersible pump (115) afterwards and draws water, after a period of time of such as drawing water Still to take the muddy water for silt particle, then lift the third filter packet (133) that immersible pump (115) throws 0.5m high again, repeatedly, directly Until immersible pump (115) extract clear water out.

10. a kind of deep basal pit according to claim 1 is met, artesian water is prominent to gush decompression drought stress construction method, and feature exists In: the S6 step the following steps are included:

S6.1: bottom plate (145) sealing welds water-proof wing-ring (144) on one end that well casing (140) are higher than wellhole (113), described Water-proof wing-ring (144) is equipped with twice, then pours coagulation in the gap on the inside of casing (120) between well casing (140) outer wall Soil, forms bottom plate (145), and upper track water-proof wing-ring (144) is located at 100mm under bottom plate (145) top surface, lower road water-proof wing-ring (144) The 100mm on bottom plate (145) bottom surface；

S6.2: shut-in well control water will be located at well casing (140) cutting of bottom plate (145) top surface or less 100mm, and propose immersible pump (115), top is placed in well casing (140) with the control water steel pipe (146) that valve lower part is chimney filter (141), at an upper portion thereof Connection vacuum pump draws water, by water level control bottom plate (145) bottom 1.0m in well hereinafter, into wellhole (113), backfill is thick at this time At sand gravel (154) to bottom plate (145) bottom 1.0m, isolation steel plate (147) is then placed, is then poured onto bottom plate with plain concrete (152) (145) under top surface at 200mm, valve is closed after concrete initial set, 100mm under casting concrete to bottom plate (145) top surface is welded with The closure steel plate (155) flushed with upper track water-proof wing-ring (144) is finally poured with microdilatancy concrete (153) flat；

S6.3: grouting and reinforcing carries out grouting filling consolidation process to foundation soil.