CN103774698A - Soil engineering drainage-free construction method - Google Patents
Soil engineering drainage-free construction method Download PDFInfo
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- CN103774698A CN103774698A CN201410051063.XA CN201410051063A CN103774698A CN 103774698 A CN103774698 A CN 103774698A CN 201410051063 A CN201410051063 A CN 201410051063A CN 103774698 A CN103774698 A CN 103774698A
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Abstract
The invention discloses a soil engineering drainage-free construction method, and belongs to the field of building pit construction of civil engineering. The soil engineering drainage-free construction method comprises the following steps: A, determining basement backfill thickness and adjusted pit bottom elevation; B, excavating a foundation pit to a pit bottom during no rainfall to enable the foundation pit to be in the adjusted pit bottom elevation position; C, leveling up the adjusted pit bottom so as to enable all elevations to be positioned in the same height; D, laying waterproof geotextile on the pit wall of the foundation pit and the adjusted pit bottom; E, paving backfill materials on the waterproof geotextile to the position of the designed elevation of the pit bottom; the soil engineering drainage-free construction method provided by the invention is adopted, and since individual precipitation or drainage treatment to underground water is not required, the work amount of dewatering and drainage can be reduced, and the cost of dewatering and drainage can be reduced; water inside a pit can play a slurry wall protecting effect; disturbances to undergroundwater is small, and water and soil environment protection can be facilitated.
Description
Technical field
The present invention relates to the foundation ditch construction method in a kind of civil construction field.
Background technology
In prior art, in foundation pit construction process, while meeting underground water, be generally all by the special drainage measure that falls, first underground water fallen, then the soil body in hole is excavated to hole end design elevation; This method, need separately underground water to be done to precipitation or draining processing, run into the situation that soil body osmotic coefficient is larger, the required draining treatment measures of falling are comparatively complicated, disposal cost is higher, especially little apart from the degree of depth of hole end design elevation in groundwater table, and in the time that certain direction foundation ditch planar dimension is little, very waste of manpower and financial resources.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of geotechnological drainage-free construction method that does not need separately underground water to be done precipitation or draining processing.
The present invention solves the geotechnological drainage-free construction method that its technical problem adopts, and comprises the following steps:
A, according to intending the severe of backfilling material, underground water absolute altitude, hole end design elevation, determine substrate backfill thickness and adjust after hole end absolute altitude; Making underground water absolute altitude is h to the distance of cheating end design elevation, and underground water absolute altitude is H to the distance of adjusting rear hole end absolute altitude, and substrate backfill thickness is Z, and the severe of backfilling material is γ
1, the severe of underground water is γ
w, backfill thickness Z=k γ
wh/(γ
1-γ
w), wherein, H=Z+h, k is anti-floating safety factor, k>=1.05;
B, not precipitation excavation pit to cheat the end be positioned at adjust after hole the end absolute altitude position;
At the bottom of hole after C, smooth adjustment, make its everywhere absolute altitude in sustained height;
At the bottom of D, hole at the hole of foundation ditch wall and after adjusting, lay waterproof geotextile;
E, on waterproof geotextile, lay backfilling material to the position of cheating end design elevation.
Further, described waterproof geotextile by the hole of foundation ditch at the bottom of, hole wall cover after, the outer of waterproof geotextile extends to foundation ditch top periphery, making the length at outer to the foundation ditch top of waterproof geotextile is L, L >=2 meter.
Further, described backfilling material is graded sand cobble, sandy gravel+concrete or rubble+concrete.
The invention has the beneficial effects as follows: adopt geotechnological drainage-free construction method of the present invention, owing to having adopted waterproof geotextile, underground water is isolated, therefore do not need separately underground water to be done to precipitation or draining processing, can reduce the drainage works amount of falling, save and fall effluent cost; Meanwhile, underground water can also play the effect of " mud " retaining wall; Little to underground water disturbance, be conducive to protect water and soil environment.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Shown in figure: 1-underground water absolute altitude, 2-hole end design elevation, hole end absolute altitude after 3-adjusts, 4-waterproof geotextile, 5-backfilling material.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, geotechnological drainage-free construction method of the present invention, comprises the following steps:
A, according to intending the severe of backfilling material 5, underground water absolute altitude 1, hole end design elevation 2, determine substrate backfill thickness and adjust after hole end absolute altitude 3; Making underground water absolute altitude 1 is h to the distance of hole end design elevation 2, and underground water absolute altitude 1 is H to the distance of adjusting rear hole end absolute altitude 3, and substrate backfill thickness is Z, and the severe of backfilling material 5 is γ
1, the severe of underground water is γ
w, backfill thickness Z=k γ
wh/(γ
1-γ
w), wherein, H=Z+h, k is anti-floating safety factor, k>=1.05; Severe represents the weight of unit volume material, and with symbol, γ represents;
B, not precipitation excavation pit to cheat the end be positioned at adjust after end absolute altitude 3 position, hole;
At the bottom of hole after C, smooth adjustment, make its everywhere absolute altitude in sustained height;
At the bottom of D, hole at the hole of foundation ditch wall and after adjusting, lay waterproof geotextile 4;
E, on waterproof geotextile 4, lay backfilling material 5 to end design elevation 2 position, hole.
Wherein, precipitation excavation pit does not refer in the process of excavation pit, underground water is not done to precipitation or draining processing.
Described waterproof geotextile 4 need to meet antiseepage and wear-resisting, at least should guarantee that described geotextile 4 can be not destroyed because the deadweight of backfilling material 5 covers in the process of laying backfilling material 5.
Generally, the backfilling material adopting in work progress is all gathered materials on the spot, all backfilling material and the construction equipment in different job sites is different, according to the difference of all backfilling materials in different job sites and equipment, described backfilling material 5 can be selected grating sandy gravel, or sandy gravel and Combined concrete, or rubble and Combined concrete etc.
Described backfilling material 5 is laid in the process of described waterproof geotextile 4, described backfilling material 5 contacts the initial stage of described geotextile 4, while just having started backfill, should lowly fill out and put down gently, at the nearer height of the described geotextile 4 of distance, described backfilling material 5 is put into above described geotextile 4 gently, when avoiding backfilling material 5 to drop to geotextile 4, damage geotextile 4; Reach 30cm when above until backfill thickness, can improve gradually the height of backfilling material 5 described in let-down.
Owing to having adopted waterproof geotextile 4 by underground water isolation, therefore do not need separately underground water to be done to precipitation or draining processing, can reduce the drainage works amount of falling, save and fall effluent cost; Water underground water can play the effect of " mud " retaining wall simultaneously; And little to underground water disturbance, be conducive to protect water and soil environment.
As shown in Figure 1, for waterproof geotextile 4 being fixed in foundation ditch, described waterproof geotextile 4 by the hole of foundation ditch at the bottom of, after hole wall covers, the outer of waterproof geotextile 4 extends to foundation ditch top periphery, making the length at outer to the foundation ditch top of waterproof geotextile 4 is L, as preferred embodiment, L >=2 meter, so that it is further fixed by waterproof geotextile 4 to increase fixation at foundation ditch periphery, for example by weight, described waterproof geotextile 4 is pressed in to foundation ditch periphery or described waterproof geotextile 4 is followed closely at foundation ditch periphery, in order to avoid described backfilling material 5 is laid in the process of described waterproof geotextile 4, after coming off, described waterproof geotextile 4 drops in foundation ditch.
Different according to the difference requirement of each design, known operating mode difference and designer's conservative degree, described anti-floating safety factor k value will be different, k value is larger, anti-floating security performance is better, but also can be with and serve drawback simultaneously, for example: the cutting depth of foundation ditch increases, increase substrate backfill thickness, thereby increase the engineering quantity of excavation pit and the consumption of increase backfilling material, generally, described anti-floating safety factor k value is 1.05.
Generally, described backfilling material 5 is graded sand cobble, or sandy gravel and Combined concrete, or rubble and Combined concrete.
Claims (3)
1. geotechnological drainage-free construction method, is characterized in that, comprises the following steps:
A, according to intend backfilling material (5) severe, underground water absolute altitude (1), hole end design elevation (2), determine substrate backfill thickness and adjust after hole end absolute altitude (3); Making underground water absolute altitude (1) is h to the distance of cheating end design elevation (2), and underground water absolute altitude (1) is H to the distance of adjusting rear hole end absolute altitude (3), and substrate backfill thickness is Z, and the severe of backfilling material (5) is γ
1, the severe of underground water is γ
w, backfill thickness Z=k γ
wh/(γ
1-γ
w), wherein, H=Z+h, k is anti-floating safety factor, k>=1.05;
B, not precipitation excavation pit to cheat the end be positioned at adjust after hole end absolute altitude (3) position;
At the bottom of hole after C, smooth adjustment, make its everywhere absolute altitude in sustained height;
D, the hole of foundation ditch wall and adjust after hole at the bottom of lay waterproof geotextile (4);
E, on waterproof geotextile (4), lay backfilling material (5) to the position of cheating end design elevation (2).
2. geotechnological drainage-free construction method as claimed in claim 1, it is characterized in that: described waterproof geotextile (4) by the hole of foundation ditch at the bottom of, hole wall cover after, the outer of waterproof geotextile (4) extends to foundation ditch top periphery, making the length at outer to the foundation ditch top of waterproof geotextile (4) is L, L >=2 meter.
3. geotechnological drainage-free construction method as claimed in claim 1, is characterized in that: described backfilling material (5) is graded sand cobble, or sandy gravel and Combined concrete, or rubble and Combined concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410051063.XA CN103774698B (en) | 2014-02-14 | 2014-02-14 | Soil engineering drainage-free construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410051063.XA CN103774698B (en) | 2014-02-14 | 2014-02-14 | Soil engineering drainage-free construction method |
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|---|---|
| CN103774698A true CN103774698A (en) | 2014-05-07 |
| CN103774698B CN103774698B (en) | 2015-05-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351218A (en) * | 2016-08-31 | 2017-01-25 | 南京工业大学 | Broken pile remedying method |
| CN113186961A (en) * | 2021-04-29 | 2021-07-30 | 中国一冶集团有限公司 | Foundation pit drainage method capable of reducing influence on surrounding buildings |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070103983A (en) * | 2006-04-21 | 2007-10-25 | 박인구 | The drainage plate for dranining underground water of public works and construction method using thesame |
| CN101565934A (en) * | 2008-04-24 | 2009-10-28 | 中国神华能源股份有限公司 | Method for laying geotextile underwater |
| CN102888847A (en) * | 2012-10-19 | 2013-01-23 | 中国二十二冶集团有限公司 | Construction method free from lowering water level for local deep foundation pit of elevator shaft |
| CN103452124A (en) * | 2013-09-04 | 2013-12-18 | 中国十九冶集团有限公司 | Method and device for removing accumulated water in foundation pit |
-
2014
- 2014-02-14 CN CN201410051063.XA patent/CN103774698B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070103983A (en) * | 2006-04-21 | 2007-10-25 | 박인구 | The drainage plate for dranining underground water of public works and construction method using thesame |
| CN101565934A (en) * | 2008-04-24 | 2009-10-28 | 中国神华能源股份有限公司 | Method for laying geotextile underwater |
| CN102888847A (en) * | 2012-10-19 | 2013-01-23 | 中国二十二冶集团有限公司 | Construction method free from lowering water level for local deep foundation pit of elevator shaft |
| CN103452124A (en) * | 2013-09-04 | 2013-12-18 | 中国十九冶集团有限公司 | Method and device for removing accumulated water in foundation pit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351218A (en) * | 2016-08-31 | 2017-01-25 | 南京工业大学 | Broken pile remedying method |
| CN113186961A (en) * | 2021-04-29 | 2021-07-30 | 中国一冶集团有限公司 | Foundation pit drainage method capable of reducing influence on surrounding buildings |
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| Publication number | Publication date |
|---|---|
| CN103774698B (en) | 2015-05-06 |
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