CN101713193A - Gravity-flow type dewatering construction method for foundation pit - Google Patents
Gravity-flow type dewatering construction method for foundation pit Download PDFInfo
- Publication number
- CN101713193A CN101713193A CN200910234011A CN200910234011A CN101713193A CN 101713193 A CN101713193 A CN 101713193A CN 200910234011 A CN200910234011 A CN 200910234011A CN 200910234011 A CN200910234011 A CN 200910234011A CN 101713193 A CN101713193 A CN 101713193A
- Authority
- CN
- China
- Prior art keywords
- retaining wall
- dewatering
- foundation pit
- filter retaining
- gravity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a gravity-flow type dewatering construction method for a foundation pit, belonging to the technical field of building construction. The method comprises the steps of: in the process of earth excavation of the foundation pit, first reducing the underground water level of a field by using conventional dewatering methods, such as dewatering by light well points, and the like; arranging a sandbag inverse filter retaining wall at the bonding interface of an upper layer phreatic aquifer and a lower layer confining bed of a side slope of the foundation pit; arranging an underground water level observation well behind the filter retaining wall; after finishing the excavation of the foundation pit, monitoring the underground water level behind the filter retaining wall by using the underground water level observation well; and dewatering by combining gravity-flow dewatering by the filter retaining wall with auxiliary dewatering by the light well points. The invention has simple method and convenient implementation, and combines the gravity-flow dewatering by the filter retaining wall with the auxiliary dewatering by the light well points, thereby greatly reducing the used machine shifts of dewatering machinery, reducing the electric power consumption, lowering the construction cost, and simultaneously ensuring the safety and the stability of the side slope of the foundation pit.
Description
Technical field
The present invention relates to the precipitation method of building foundation pit, belong to technical field of building construction.
Background technology
In building foundation pit cutting depth scope, when upper soil horizon is the easy phreatic aquifers that form quicksand soil layer composition such as silt flour sand, when the bottom soil layer is cohesive soil water proof base plate, use conventional light well point or tube well dewatering, dewatering measures such as this well point or pipe well, need keep the drawdown in the well casing by uninterruptedly drawing water, to reduce the groundwater table in place, precipitation machinery uses the machine-team height, energy consumption is big, and the difficult eliminating of the underground water at upper strata silt flour sand layer and lower floor water proof base plate combination interface place, remaining phreatic seepage flow causes excavation slope stream earth fall side easily.
Summary of the invention
Purpose of the present invention is exactly to solve the deficiency that the existing precipitation of building foundation pit exists, and a kind of gravity-flow type dewatering construction method for foundation pit is provided, and enforcement by this method reaches the saving construction cost, and guarantees the purpose of excavation slope safety and stability.
The gravity-flow type dewatering construction method for foundation pit that is achieved through the following technical solutions is characterized in that:
1. when pit earthwork excavates, use conventional precipitation method reduction place groundwater table such as light well point earlier, at excavation slope upper strata phreatic aquifer and lower floor water proof base plate combination interface place, the anti-retaining wall of filtering of sand pocket is set, behind anti-filter retaining wall, the groundwater table observation well is set;
2. after excavation of foundation pit is finished, stop light well point precipitation, utilize anti-filter retaining wall gravity flow precipitation, allow underground water under the effect of self gravitation, see through anti-filter retaining wall and flow into voluntarily in the end sump of hole, discharge foundation ditch with submersible pump;
3. utilize the groundwater table after the groundwater table observation well is monitored anti-filter retaining wall, when groundwater table height behind the anti-filter retaining wall is high greater than 3/4 anti-filter retaining wall, the auxiliary precipitation of startup light well point, groundwater table is lower than 3/4 anti-filter retaining wall height behind wall.Anti-filter retaining wall height calculates by well hydraulic jump and remnants groundwater table on-the-spot excavation test in aquifer determines that width is pressed stability of retaining wall calculating and determined.
Described anti-filter retaining wall adopts flexible woven bag to fill the sand grains pile and forms.Fill that the ratio of soil layer grain diameter satisfies anti-filter requirement behind sand grains particle diameter and the wall, make retaining wall not only satisfy permeable but also satisfy retaining soil nature energy, generally satisfy D
50=(4～10) d
50, D
50, d
50Be respectively and fill the particle cumulative weight of sieving of soil layer particle behind sand grains and the wall and account for the sieve diameter of gross weight 50%.
The inventive method is simple, and it is convenient to implement, and utilizes anti-filter retaining wall gravity flow precipitation to combine with the auxiliary precipitation of light well point, reduces the use machine-team of precipitation machinery greatly, reduces power consumption, reduces construction cost, guarantees the safety and stability of excavation slope simultaneously.
Description of drawings
Fig. 1 is the schematic diagram of foundation ditch gravity flow dewatering construction of the present invention;
Among the figure: 1 anti-filter retaining wall, 2 water level observation wells, 3 light well points, 4 sumps, 5 phreatic aquifers, 6 water proof base plates, 7 submersible pumps.
The specific embodiment
1. when the excavation pit earthwork, use light well point 3 to reduce the place groundwater table earlier, at excavation slope upper strata phreatic aquifer 5 and lower floor's water proof base plate 6 combination interface places, be provided with flexible woven bag and fill the anti-retaining wall 1 of filtering of sand pocket that the sand grains pile forms, fill that the ratio of soil layer grain diameter satisfies anti-filter requirement behind sand grains particle diameter and the wall, make retaining wall not only satisfy permeable but also satisfy retaining soil nature energy.Behind anti-filter retaining wall, groundwater table observation well 2 is set;
2. after excavation of foundation pit is finished, stop light well point precipitation, utilize anti-filter retaining wall 1 gravity flow precipitation, allow underground water under the effect of self gravitation, see through anti-filter retaining wall and flow into voluntarily in the hole end sump 4, discharge foundation ditch with submersible pump;
3. utilize the groundwater table after retaining wall is instead filtered in 2 monitorings of groundwater table observation well, when groundwater table height behind the anti-filter retaining wall is high greater than 3/4 wall, start the auxiliary precipitation of light well point, groundwater table is lower than 3/4 wall height behind wall.
Claims (2)
1. gravity-flow type dewatering construction method for foundation pit, it is characterized in that: during (1) pit earthwork excavation, use light well point to reduce the place groundwater table earlier, at excavation slope upper strata phreatic aquifer and lower floor water proof base plate combination interface place the anti-retaining wall of filtering of sand pocket is set, behind anti-filter retaining wall, the groundwater table observation well is set; (2) after excavation of foundation pit is finished, stop light well point precipitation, utilize anti-filter retaining wall gravity flow precipitation, allow underground water under the effect of self gravitation, see through anti-filter retaining wall and flow into voluntarily in the end sump of hole, discharge foundation ditch with submersible pump; (3) utilize groundwater table behind the anti-filter of the groundwater table observation well monitoring retaining wall, when groundwater table height behind the anti-filter retaining wall is high greater than 3/4 anti-filter retaining wall, start the auxiliary precipitation of light well point, groundwater table is lower than 3/4 anti-filter retaining wall height behind wall.
2. gravity-flow type dewatering construction method for foundation pit according to claim 1 is characterized in that described anti-filter retaining wall adopts flexible woven bag to fill the sand grains pile and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910234011A CN101713193A (en) | 2009-11-19 | 2009-11-19 | Gravity-flow type dewatering construction method for foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910234011A CN101713193A (en) | 2009-11-19 | 2009-11-19 | Gravity-flow type dewatering construction method for foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101713193A true CN101713193A (en) | 2010-05-26 |
Family
ID=42417155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910234011A Pending CN101713193A (en) | 2009-11-19 | 2009-11-19 | Gravity-flow type dewatering construction method for foundation pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101713193A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205978A (en) * | 2013-04-18 | 2013-07-17 | 成军 | High-permeability zone under-water-level elevator foundation pit open caisson moulding bed construction method |
-
2009
- 2009-11-19 CN CN200910234011A patent/CN101713193A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205978A (en) * | 2013-04-18 | 2013-07-17 | 成军 | High-permeability zone under-water-level elevator foundation pit open caisson moulding bed construction method |
| CN103205978B (en) * | 2013-04-18 | 2014-12-10 | 南通英雄建设集团有限公司 | High-permeability zone under-water-level elevator foundation pit open caisson moulding bed construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10577770B2 (en) | Self-starting negative pressure drainage system for draining groundwater in slope and construction method thereof | |
| CN101806055B (en) | Vacuum pre-pressed joint rigid pile composite foundation reinforcing method | |
| CN102383412A (en) | Construction method by adopting dewatering and water recharging to control sedimentation surrounding deep foundation pit | |
| CN104060620A (en) | Karst fissure water control method for deep foundation pit | |
| CN111691425B (en) | Water conservancy project foundation pit and pipe well combined light well point dewatering and drainage method | |
| CN101634139B (en) | Dynamic compaction method for backfill foundation with drainage layer | |
| CN104264653A (en) | Superhigh energy level dynamic compaction and replacement compatible construction process | |
| CN108797759B (en) | Underwater riprap grouting reinforcement method for suspended soft foundation below immersed tube | |
| CN112962525B (en) | Dredged soil filling and diking structure and filling bag diking method thereof | |
| CN104711973A (en) | Construction method for small-diameter pile composite foundation | |
| CN116516898B (en) | High-groundwater excavation channel side slope drainage system and construction method | |
| CN211898541U (en) | Guide wall structure for reinforced structure of air shaft initial end head | |
| CN209114425U (en) | A kind of irrigation canals and ditches that can normally use in a variety of contexts | |
| CN101713193A (en) | Gravity-flow type dewatering construction method for foundation pit | |
| CN113958363B (en) | Inclined base strip mine inner drainage method and construction method | |
| CN113622364B (en) | Construction method suitable for strip mine underground reservoir with depth larger than 100m in water-poor area | |
| CN111549807B (en) | Water lowering and draining method combining water conservancy project foundation pit and pipe well with light well point | |
| CN201158823Y (en) | Recoverable impact drill steel pipe downcast well | |
| CN101003973A (en) | Method for treating quasi-prepressing groundwork of artificial island | |
| CN112695779A (en) | High-rise building foundation pit construction method for local precipitation of elevator shaft foundation pit | |
| CN203334335U (en) | Large depth coarse sand soil embankment foundation vertical spreading membrane seepage cutoff grooving machine structure | |
| CN207193993U (en) | A kind of subway foundation pit dewatering well with monitoring depressurization | |
| CN203222805U (en) | Internal-supporting type deep foundation pit latticed column well-point rainfall system | |
| CN201420257Y (en) | Water injection well | |
| CN214883767U (en) | Local precipitation system of elevator shaft foundation pit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100526 |