CN110106886A - A kind of deep pit digging method of underground high water level - Google Patents

A kind of deep pit digging method of underground high water level Download PDF

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Publication number
CN110106886A
CN110106886A CN201910269985.0A CN201910269985A CN110106886A CN 110106886 A CN110106886 A CN 110106886A CN 201910269985 A CN201910269985 A CN 201910269985A CN 110106886 A CN110106886 A CN 110106886A
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Prior art keywords
digging
water
pit
underground
excavation
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CN201910269985.0A
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Chinese (zh)
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不公告发明人
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徐晔
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Priority to CN201910269985.0A priority Critical patent/CN110106886A/en
Publication of CN110106886A publication Critical patent/CN110106886A/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/08Restraining of underground water by employing open ditches arranged below the level of the water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water

Abstract

The invention discloses a kind of deep pit digging methods of underground high water level, belong to deep pit digging field, a kind of deep pit digging method of underground high water level, the following steps are included: S1: design early period and cleaning, S2: well point construction, including foundation pit drains outside and foundation pit internal drainage, S3: deep pit digging, S4: the prevention and treatment of drift sand phenomenon and processing, S5: S6: Piping phenomenon prevention and treatment and processing repair side and clear bottom.Compared with the prior art, the present invention can reduce level of ground water by well point construction, excavation of foundation pit and construction is set to reach anhydrous state, to guarantee going on smoothly for construction quality and engineering, the drift sand phenomenon generated in Deep Excavation is prevented and treated by using the flowing pressure and second level of balance seepage flow or three-level well point method simultaneously, and using piping mouth blocking covering and bright draining digging measure, generation the phenomenon that cope with and prevent and treat piping.

Description

A kind of deep pit digging method of underground high water level
Technical field
The present invention relates to deep pit digging field, specially a kind of deep pit digging method of underground high water level.
Background technique
With the improvement of people's living standards, the demand to residential architecture is being constantly increasing, the house of various types is small Area is constantly built, and requirement of the people to the underground space is more and more, and building embedded depth of foundation is caused accordingly to be constantly increasing, but Be in Deep Excavation, when excavate bottom surface absolute altitude be lower than level of ground water foundation pit when, due to soil water-bearing layer be cut off, Underground water can constantly penetrate into hole, so that excavating difficulty, time-consuming, side slope is easy to cave in, and will lead to ground and be flooded Bubble disturbs foundation soil, causes the differential settlement of building after completion of works, make construction cracking or destruction, while in deep base In the construction of hole, drift sand, Piping phenomenon easily occur, and it is greatly unfavorable to bring to construction.
Summary of the invention
The purpose of the present invention is to provide a kind of deep pit digging methods of underground high water level, to solve above-mentioned background technique The problem of middle proposition.
To achieve the above object, the invention provides the following technical scheme: a kind of deep pit digging method of underground high water level, The following steps are included:
S1: according to the requirement of arrangement and method for construction, removing the underground in construction area, ground barrier and be disposed, and The range for treating digging deep basal pit measures unwrapping wire;
S2: well point construction sets wide aproll slope protection around foundation pit, by bright ditch in surface water section admission, is precipitated three times Afterwards, into Urban Underground water channel, then in foundation pit bottom brick loose tool side formation collecting gutter, sump is excavated at collecting gutter both ends, is used Power water pump drains foundation pit;
S3: excavation of foundation pit, foundation pit mechanical excavation is synchronous with foundation pit retaining wall intersection to carry out;
S4: when there is drift sand, stop excavating immediately, and backfill dell and bury drift sand, or fill the water in dell, with flat The flowing pressure of weighing apparatus seepage flow, second level or three-level well point under then mending immediately around dell, is further continued for excavation construction;
S5: to the groundwater saturation line absolute altitude in excavator body lower than hole bottom absolute altitude, due to the effect foundation pit meeting of lower artesian water There is piping, blocking covering can be carried out to piping mouth immediately, reduces the sand running-down of water burst mouth, while digging at hole bottom and temporarily catchmenting Hole carries out bright draining with water pump, carries out digging to soil in hole, and when cutting the earth to after cheating bottom absolute altitude, sump is embedded in the subsoil of hole, The flowing water of piping is set to flow into sump along french drain to weeper drain is done between sump using diving pump drainage, and in piping point;
S6: repairing side and clear bottom is ferreted out horizontal line at away from slot bottom designed elevation 50cm ledge, nails on small wood and sticks up, then uses Soil layer will manually be persisted to scoop away, while stake is drawn by both ends axis and draws logical ray examination away from trough rim size, groove width standard is determined, repaired with this Whole trough rim finally removes the slot bottom earthwork.
Preferably, power water pump described in S2 can be power pump, electrodynamic pump, vacuum pump and siphon-pump, and when selection should press The technical performance of power water pump is selected, while according to the size of actual amount of water, determining quantity and model that power water pump uses.
Preferably, the method for excavation of foundation pit described in S3 is that layer and section is successively excavated from top to bottom, and is done at any time At certain slope gesture.
Preferably, in Excavation Process described in S3, mechanical execution dig less than the earthwork, should cooperate it is artificial at any time into Row excavates, and soil is transported to the mechanical place dug with trolley, to be scooped away in time with machinery.
Preferably, foundation pit retaining wall described in S3 mainly uses the earth work supporting construction of plate brad supporting, it is by lacing wire It is inserted into inside soil body, and the gunite concrete on broken face, so that reinforced earth body stabilization zone band is formed, to improve entire in-situ soil The intensity of body simultaneously limits its displacement, while enhancing the self stability of excavation slope slopes.
Preferably, the premise for continuing excavation construction described in S4 is by making underground water after second level or three-level well-points dewatering After saturation is lower than range or less 50cm is excavated.
Preferably, material used by blocking covering method described in S5 is microlith or mung bean sand filter blanket, guarantees that flowing water is smooth Lead to but is not lost sand.
Preferably, digging mode described in S5 uses digging measure, first digs interim catch pit, and the rear issue that digs is to catch pit Weeper drain, the last excavation pit soil body.
Compared with prior art, the beneficial effects of the present invention are: the present invention underground high water level Deep Excavation In, level of ground water can be effectively reduced by well point construction, so that excavation of foundation pit and construction is reached anhydrous state, to guarantee engineering Quality and engineering are gone on smoothly, while being come by using the flowing pressure of balance seepage flow and second level or three-level well point method to depth The drift sand phenomenon generated in Excavation Process is prevented and treated, and blocks covering and bright draining digging measure using piping mouth, Come generation the phenomenon that coping with and prevent and treat piping.
Detailed description of the invention
Fig. 1 is excavation flow chart of the invention.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects It encloses.
Embodiment one
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of deep pit digging method of underground high water level, including Following steps:
S1: according to the requirement of arrangement and method for construction, removing the underground in construction area, ground barrier and be disposed, and The range for treating digging deep basal pit measures unwrapping wire;
S2: well point construction sets wide aproll slope protection around foundation pit, by bright ditch in surface water section admission, is precipitated three times Afterwards, into Urban Underground water channel, then in foundation pit bottom brick loose tool side formation collecting gutter, sump is excavated at collecting gutter both ends, is used Power water pump drains foundation pit, and power water pump can be power pump, electrodynamic pump, vacuum pump and siphon-pump, and when selection should press The technical performance of power water pump is selected, while according to the size of actual amount of water, determining quantity and model that power water pump uses;
S3: excavation of foundation pit, foundation pit mechanical excavation is synchronous with foundation pit retaining wall intersection to carry out, and foundation pit retaining wall mainly uses soil nailing branch The earth work supporting construction of shield, it is that lacing wire is inserted into inside soil body, and the gunite concrete on broken face, to form reinforcement Soil stabilization zone, to improve the intensity of the entire in situ soil body and limit its displacement, while enhance excavation slope slopes from Body stability, the method for excavation of foundation pit are that layer and section is successively excavated from top to bottom, and is made into certain slope gesture, foundation pit at any time In digging process, mechanical execution dig less than the earthwork, should cooperate and manually be excavated at any time, and soil is transported to machine with trolley The place that tool is dug, to be scooped away in time with machinery;
S4: when there is drift sand, stop excavating immediately, and backfill dell and bury drift sand, or fill the water in dell, with flat The flowing pressure of weighing apparatus seepage flow, second level keeps groundwater saturation line low after second level well-points dewatering under then mending immediately around dell After excavating range or less 50cm, it is further continued for excavation construction, the premise for continuing excavation construction is dropped by second level or three-level well point After water, after so that groundwater saturation line is lower than excavation range or less 50cm;
S5: it when dell is close to artesian aquifer or being computed the anti-floating of hole subsoil body and be not able to satisfy stability requirement, can adopt Impermeable stratum is passed through with well-point pipe and directly extracts the artesian water under impermeable stratum, to reduce artesian head, to avoid because of pressure-bearing Head is excessive and forms piping, to the groundwater saturation line absolute altitude in excavator body lower than hole bottom absolute altitude, due to the work of lower artesian water It will appear piping with foundation pit, blocking covering can be carried out to piping mouth immediately, reduce the sand running-down of water burst mouth, while digging at hole bottom Interim catch pit carries out bright draining with water pump, carries out digging to soil in hole, after shoveling to hole bottom absolute altitude, sump is embedded to and is cheated In subsoil, flow into the flowing water of piping along french drain to weeper drain is done between sump using diving pump drainage, and in piping point Sump, wherein sump can be used iron sheet barrel and be made into, and the aperture that catchments uniformly be followed closely out on bucket wall, then wrap up mung bean on the outside Sand filter blanket, digging mode use digging measure, first dig interim catch pit, the weeper drain of rear digging issue to catch pit, finally The excavation pit soil body, blocking material used by covering method is microlith or mung bean sand filter blanket, guarantees that flowing water is unimpeded but is not lost Sand;
S6: repairing side and clear bottom is ferreted out horizontal line at away from slot bottom designed elevation 50cm ledge, nails on small wood and sticks up, then uses Soil layer will manually be persisted to scoop away, while stake is drawn by both ends axis and draws logical ray examination away from trough rim size, groove width standard is determined, repaired with this Whole trough rim finally removes the slot bottom earthwork.
Embodiment two
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of deep pit digging method of underground high water level, including Following steps:
S1: according to the requirement of arrangement and method for construction, removing the underground in construction area, ground barrier and be disposed, and The range for treating digging deep basal pit measures unwrapping wire;
S2: well point construction sets wide aproll slope protection around foundation pit, by bright ditch in surface water section admission, is precipitated three times Afterwards, into Urban Underground water channel, then in foundation pit bottom brick loose tool side formation collecting gutter, sump is excavated at collecting gutter both ends, is used Power water pump drains foundation pit, and power water pump can be power pump, electrodynamic pump, vacuum pump and siphon-pump, and when selection should press The technical performance of power water pump is selected, while according to the size of actual amount of water, determining quantity and model that power water pump uses;
S3: excavation of foundation pit, foundation pit mechanical excavation is synchronous with foundation pit retaining wall intersection to carry out, and foundation pit retaining wall mainly uses soil nailing branch The earth work supporting construction of shield, it is that lacing wire is inserted into inside soil body, and the gunite concrete on broken face, to form reinforcement Soil stabilization zone, to improve the intensity of the entire in situ soil body and limit its displacement, while enhance excavation slope slopes from Body stability, in Excavation Process, mechanical execution dig less than the earthwork, should cooperate and manually be excavated at any time, and use hand Soil is transported to the mechanical place dug by cart, and to be scooped away in time with machinery, the method for excavation of foundation pit is layering point from top to bottom Duan Yici is excavated, and is made into certain slope gesture at any time;
S4: when there is drift sand, stop excavating immediately, and backfill dell and bury drift sand, or fill the water in dell, with flat The flowing pressure of weighing apparatus seepage flow, three-level well point makes underground water infiltration after three-level well-points dewatering under then mending immediately around dell After line is lower than range or less 50cm is excavated, it is further continued for excavation construction, the premise for continuing excavation construction is by second level or three-level well After point dewatering, after so that groundwater saturation line is lower than excavation range or less 50cm;
S5: it when dell is close to artesian aquifer or being computed the anti-floating of hole subsoil body and be not able to satisfy stability requirement, can adopt Impermeable stratum is passed through with well-point pipe and directly extracts the artesian water under impermeable stratum, to reduce artesian head, to avoid because of pressure-bearing Head is excessive and forms piping, to the groundwater saturation line absolute altitude in excavator body lower than hole bottom absolute altitude, due to the work of lower artesian water It will appear piping with foundation pit, blocking covering can be carried out to piping mouth immediately, reduce the sand running-down of water burst mouth, while digging at hole bottom Interim catch pit carries out bright draining with water pump, carries out digging to soil in hole, after shoveling to hole bottom absolute altitude, sump is embedded to and is cheated In subsoil, flow into the flowing water of piping along french drain to weeper drain is done between sump using diving pump drainage, and in piping point Sump, wherein sump can be used iron sheet barrel and be made into, and the aperture that catchments uniformly be followed closely out on bucket wall, then wrap up mung bean on the outside Sand filter blanket, blocking material used by covering method is microlith or mung bean sand filter blanket, guarantees that flowing water is unimpeded but is not lost sand, opens Excavation formula uses digging measure, first digs interim catch pit, the rear weeper drain for digging issue to catch pit, last excavation pit soil Body;
S6: repairing side and clear bottom is ferreted out horizontal line at away from slot bottom designed elevation 50cm ledge, nails on small wood and sticks up, then uses Soil layer will manually be persisted to scoop away, while stake is drawn by both ends axis and draws logical ray examination away from trough rim size, groove width standard is determined, repaired with this Whole trough rim finally removes the slot bottom earthwork.
By comparing experiment to above-mentioned two groups of embodiments, drift sand phenomenon can be prevented and treated, wherein embodiment Three-level well point is used in two, and preferably drift sand phenomenon can be prevented and treated, regulation effect is more preferable, compared with prior art, this Advantageous effect of the invention is: the present invention, can be effectively by well point construction in the Deep Excavation of underground high water level Lowering of watertable makes excavation of foundation pit and construction reach anhydrous state, to guarantee going on smoothly for construction quality and engineering, simultaneously By using the flowing pressure and second level or three-level well point method of balance seepage flow come to the drift sand generated in Deep Excavation Phenomenon is prevented and treated, and using piping mouth blocking covering and the bright draining digging measure of sump, to cope with and prevent and treat piping The phenomenon that occur.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (8)

1. a kind of deep pit digging method of underground high water level, which comprises the following steps:
S1: according to the requirement of arrangement and method for construction, the underground in construction area, ground barrier are removed and is disposed, and treated The range for digging deep basal pit measures unwrapping wire;
S2: well point construction sets wide aproll slope protection around foundation pit, and surface water is cut in admission in bright ditch, after precipitating three times, into Enter Urban Underground water channel, then form collecting gutter in foundation pit bottom brick loose tool side, sump is excavated at collecting gutter both ends, using power water Pump drains foundation pit;
S3: excavation of foundation pit, foundation pit mechanical excavation is synchronous with foundation pit retaining wall intersection to carry out;
S4: when there is drift sand, stop excavating immediately, and backfill dell and bury drift sand, or fill the water in dell, be seeped with balancing The flowing pressure of stream, second level or three-level well point under then mending immediately around dell, is further continued for excavation construction;
S5: to the groundwater saturation line absolute altitude in excavator body lower than hole bottom absolute altitude, since the effect foundation pit of lower artesian water will appear Piping can carry out blocking covering to piping mouth immediately, reduce the sand running-down of water burst mouth, while digging interim catch pit at hole bottom and using Water pump carries out bright draining, carries out digging to soil in hole, after shoveling to hole bottom absolute altitude, sump is embedded in the subsoil of hole, use Diving pump drainage, and so that the flowing water of piping is flowed into sump along french drain to weeper drain is done between sump in piping point;
S6: repairing side and clear bottom is ferreted out horizontal line at away from slot bottom designed elevation 50cm ledge, nails on small wood and sticks up, then manually Soil layer will be persisted to scoop away, while stake is drawn by both ends axis and draws logical ray examination away from trough rim size, groove width standard is determined, with this trim slots The slot bottom earthwork is finally removed on side.
2. a kind of deep pit digging method of underground high water level according to claim 1, it is characterised in that: moved described in S2 Power water pump can be power pump, electrodynamic pump, vacuum pump and siphon-pump, and when selection should be selected by the technical performance of power water pump, simultaneously According to the size of actual amount of water, quantity and model that power water pump uses are determined.
3. a kind of deep pit digging method of underground high water level according to claim 1, it is characterised in that: base described in S3 The method that hole is excavated is that layer and section is successively excavated from top to bottom, and is made into certain slope gesture at any time.
4. a kind of deep pit digging method of underground high water level according to claim 1, it is characterised in that: base described in S3 Cheat digging process in, mechanical execution dig less than the earthwork, should cooperate and manually be excavated at any time, and soil is transported to trolley The place that machinery is dug, to be scooped away in time with machinery.
5. a kind of deep pit digging method of underground high water level according to claim 1, it is characterised in that: base described in S3 Hole retaining wall mainly uses the earth work supporting construction of plate brad supporting, it is lacing wire to be inserted into inside soil body, and spray on broken face Concrete is penetrated, to form reinforced earth body stabilization zone band, to improve the intensity of the entire soil body in situ and limit its displacement, simultaneously Enhance the self stability of excavation slope slopes.
6. a kind of deep pit digging method of underground high water level according to claim 1, it is characterised in that: described in S4 after The premise of continuous excavation construction is by after second level or three-level well-points dewatering, making groundwater saturation line lower than 50cm below excavation range Afterwards.
7. a kind of deep pit digging method of underground high water level according to claim 1, it is characterised in that: blocked up described in S5 Filling in material used by covering method is microlith or mung bean sand filter blanket, guarantees that flowing water is unimpeded but is not lost sand.
8. a kind of deep pit digging method of underground high water level according to claim 1, it is characterised in that: opened described in S5 Excavation formula uses digging measure, first digs interim catch pit, the rear weeper drain for digging issue to catch pit, last excavation pit soil Body.
CN201910269985.0A 2019-04-04 2019-04-04 A kind of deep pit digging method of underground high water level Pending CN110106886A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN110644498A (en) * 2019-09-23 2020-01-03 李贺清 Deep foundation pit slope quicksand handling method

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CN110644498A (en) * 2019-09-23 2020-01-03 李贺清 Deep foundation pit slope quicksand handling method

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