CN110924375A - Foundation treatment method - Google Patents
Foundation treatment method Download PDFInfo
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- CN110924375A CN110924375A CN201911146076.4A CN201911146076A CN110924375A CN 110924375 A CN110924375 A CN 110924375A CN 201911146076 A CN201911146076 A CN 201911146076A CN 110924375 A CN110924375 A CN 110924375A
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- water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a foundation treatment method, relates to the field of foundation construction, and aims to solve the problems that the current foundation treatment method cannot judge water inrush in advance, so that the construction progress is influenced and potential safety hazards are caused, and the technical scheme is as follows: step one, analyzing geological data of a construction range; step two, geological survey, which comprises the steps of carrying out geological survey on the construction range according to an analysis result of the step and determining possible abnormal point positions; step three, advanced verification, which comprises the step of performing drilling verification at abnormal point positions before foundation pit excavation; fourthly, excavating a foundation pit; if the foundation pit is verified to have the water inrush problem in the third step, constructing an adaptive drainage system; and step five, forming the foundation. The foundation treatment method can predict and judge whether the underground water burst problem exists in the construction range before construction so as to reduce the influence on the construction progress and simultaneously reduce potential safety hazard and economic loss.
Description
Technical Field
The invention relates to the field of foundation construction, in particular to a foundation treatment method.
Background
In the construction of buildings, the foundation structure is usually excavated and constructed first and foremost. At present, a foundation (such as a deep foundation pit) is constructed in a part of a near-river position or a region with relatively complex hydrogeological conditions, and a large amount of underground water gushes to influence construction.
The patent with publication number CN101349052 has the technical points that: a combined drainage system of a saline land area and a combined drainage dynamic compaction foundation treatment method are disclosed, wherein a combined drainage system for dredging and draining underground water is arranged in foundation soil of a treatment area, and the combined drainage system comprises a drainage channel combined by a plastic drainage belt and a sand drainage pile; covering the surface of the treatment area with plastic drainage belts and gravel drainage piles, and paving a construction operation surface layer; using a rammer to perform dynamic compaction on the construction operation surface layer; forming a ramming pit at each dynamic compaction position; collecting the underground water in the foundation into the ramming pit, and pumping and discharging the underground water collected in the ramming pit out of the construction site; and backfilling the tamping pit and leveling to finish the first point tamping.
A combined drainage system is arranged in the soil in advance, the pore water pressure in the soil is increased after the dynamic compaction construction, and the water in the soil tends to be extruded and discharged; the underground water adjacent to the drainage channel begins to be evacuated and discharged through the drainage system under the action of the water head pressure; once the underground water begins to be discharged, the water pressure of the discharge end is reduced, and under the action of a water head, continuous and ordered water flow leading to a drainage system can be naturally formed in the soil body within the dynamic compaction influence range. Along with the discharge of a large amount of underground water, the pore ratio in the soil is reduced, the strength of the foundation soil is improved, and the aim of reinforcing and improving the foundation soil is fulfilled.
The technical scheme shows a method for reducing the influence of underground water during foundation construction, but the method is suitable for implementation after problems occur, so that the construction process is influenced, equipment is easily damaged, economic loss is caused, and great potential safety hazards exist, and therefore a new technical scheme is provided.
Disclosure of Invention
The invention aims to provide a foundation treatment method which can predict and judge whether the underground water burst problem exists in a construction range before construction so as to reduce the influence on the construction progress and simultaneously reduce potential safety hazard and economic loss.
The technical purpose of the invention is realized by the following technical scheme: a method for treating the ground by using the water-based chemical agent,
analyzing geological data in a construction range, wherein the geological data comprises collecting geological information and past geological disaster information and analyzing possible hazards;
step two, geological survey, which comprises the steps of carrying out geological survey on the construction range according to an analysis result of the step and determining possible abnormal point positions;
step three, advanced verification, which comprises the step of performing drilling verification at abnormal point positions before foundation pit excavation;
fourthly, excavating a foundation pit; if the foundation pit is verified to have the water inrush problem in the third step, constructing an adaptive drainage system;
and step five, foundation forming, namely backfilling the foundation pit to construct the foundation.
Through adopting above-mentioned technical scheme, the staff can survey the scope of construction geology through ultrasonic technology, and the rethread drilling is verified to foresee in advance and judge whether there is the problem of gushing water in the scope of construction, reduce its follow-up influence to the construction progress, reduce potential safety hazard and economic loss.
The invention is further configured to: the geological measurement comprises the steps of performing primary detection on a construction range by adopting ultrasonic detection equipment, wherein the detection depth is 1.3-1.8 times of the excavation depth of a foundation pit; and acquiring adverse geological signs by ultrasonic detection, and taking the measured point position as an abnormal point position.
By adopting the technical scheme, the influence caused by water gushing after excavation of the foundation pit by underground powerful water pressure and the like can be reduced, and the abnormal point position is determined as a prevention focus.
The invention is further configured to: the geological measurement also comprises point location determination, wherein the point location determination comprises the steps of determining a plurality of measurement point locations according to the construction range area, drawing a circle by taking the measurement point locations as the circle center, and ensuring that the circle radius is less than or equal to 3m and adjacent circles are circumscribed; the middle points of the connecting lines of the centers of the adjacent circles are also taken as measurement points.
By adopting the technical scheme, the construction range can be relatively comprehensively covered, the missing probability of abnormal areas is reduced, and the detection effect is relatively better.
The invention is further configured to: the geological measurement also comprises measurement verification, wherein after the abnormal point location is found, repeated measurement is carried out for multiple times to verify whether the equipment is abnormal or not and whether the operation error is caused or not; and after the abnormal point location is determined, marking out a bad range by using the position center of the abnormal point location and 5-10m as a radius, and laying a plurality of transition measurement point locations on a boundary line of the bad range to perform ultrasonic detection or geological radar detection again.
By adopting the technical scheme, the influence caused by misoperation and the like can be reduced through multiple verification; meanwhile, point position detection is subsequently arranged on the boundary line of the bad range, so that part of unnecessary detection can be reduced, the abnormal (bad) range can be determined relatively quickly, and the detection effect is better.
The invention is further configured to: and the third step comprises the step drilling mode of drilling holes by using the drilling equipment, wherein the step drilling mode comprises the steps of temporarily stopping and withdrawing the drill bit at the position of the hole depth of 1/3, 1/2 and 6/5 to check the water burst rate.
By adopting the technical scheme, the staff can know the difference of the water burst point in depth relatively visually, and the follow-up adaptive measures can be conveniently taken.
The invention is further configured to: the construction drainage system comprises a selected drainage area, the quantity and power of the water pumps are selected according to the water inflow rate, the water inlet ends of the water pumps are fixed and communicated with the water pumping pipes, the water inlet ends of the water pumping pipes are provided with filter heads, the water inlet ends of the water pumping pipes are arranged in water flowing out, the water outlet ends of the water pumps are fixed and communicated with the drainage pipes, and the drainage pipes extend to the drainage area.
By adopting the technical scheme, the water pump is adopted to pump water to the designated area and pump the gushed water to a position relatively far away, so that the back-osmosis probability is reduced; meanwhile, the filter head is arranged at the water inlet of the pumping pipe, so that the interference of impurities to a drainage system can be reduced.
The invention is further configured to: the construction of the drainage system also comprises a water guide groove formed in the pit bottom, and an anchoring drainage bottom layer is laid in the water guide groove; the confluence pit is arranged at the bottom of the pit, the water guide groove is communicated with the confluence pit, one end of the water guide groove, which is far away from the confluence pit, is higher than one end of the water guide groove, which is communicated with the confluence pit, and the water inlet end of the water pumping pipe is arranged in the confluence pit.
By adopting the technical scheme, the problem that construction is influenced by water accumulated at four positions of the pit bottom can be solved; and simultaneously, water is conveniently pumped out of the foundation pit.
The invention is further configured to: the construction of the drainage system further comprises a plurality of water guide pipe piles anchored in the water gushing range, sand and stone materials are filled in the inner cavities of the water guide pipe piles, and the upper ends of the water guide pipe piles extend out of the pit bottom.
By adopting the technical scheme, water below the pit bottom can be guided out, and the subsequent pit bottom tamping and reinforcing effect of odd-even West is improved.
In conclusion, the invention has the following beneficial effects: through the mode of geological exploration and verification drilling, whether there is the problem of gushing water is judged in the construction scope in advance to make prevention and cure measure in advance, reduce the influence to follow-up construction, reduce potential safety hazard and economic loss.
Detailed Description
The present invention is described in detail below.
The foundation treatment method comprises the following steps:
analyzing geological data in a construction range, wherein the geological data comprises collecting geological information and past geological disaster information and analyzing possible hazards;
step two, geological survey, which comprises the steps of carrying out geological survey on the construction range according to an analysis result of the step and determining possible abnormal point positions;
step three, advanced verification, which comprises the step of performing drilling verification at abnormal point positions before foundation pit excavation;
fourthly, excavating a foundation pit; if the foundation pit is verified to have the water inrush problem in the third step, constructing an adaptive drainage system;
and step five, foundation forming, namely backfilling the foundation pit to construct the foundation.
According to the steps, the worker can know whether the water burst problem exists in the construction range in advance in the foundation construction process, so that preparation can be made in advance, and the influence of the water burst problem on construction is reduced.
The geological measurement of the second step comprises the steps of performing primary detection on the construction range by adopting ultrasonic detection equipment, wherein the detection depth is 1.3-1.8 times of the excavation depth of the foundation pit, so that the effectiveness of the detection result is ensured, and the water seepage influence caused by the action of still water and the action of strong water pressure is reduced; and acquiring adverse geological signs by ultrasonic detection to obtain a position as an abnormal point.
Before geological measurement, workers also need to determine measurement point positions; the point location determination comprises determining a plurality of measurement point locations according to the construction range area. At the moment, a worker can firstly draw out a simulation construction range on paper, then calculate and draw simulation points on the paper, and then judge and verify whether the simulation points are suitable or not; the measurement points can be uniformly and comprehensively distributed in the construction range, so that the omission probability is reduced. After the measuring points are determined, the measuring point positions are taken as circle centers to draw circles, the radius of each circle is less than or equal to 3m, the radius of each circle can be determined according to geological information of a construction range, and the more unstable the geology is, the more easily faults occur or the more easily water gushing problem occurs, the smaller the radius selection of the area is.
Adjacent circles in each circle drawn by taking each measuring point position as the center of the circle are circumscribed; the middle points of the circle center connecting lines of the adjacent circles are also used as measuring point positions, so that the detection coverage is improved, the detection effect is improved, and the omission probability is further reduced.
The geological measurement also comprises measurement verification, which comprises that after the abnormal point location is found, repeated measurement is carried out for multiple times to verify whether the equipment is abnormal or not and the operation error is caused; in the process, the measured data can be compared in sequence, and whether the measured data is the result caused by operation errors or equipment abnormal influence is judged according to the difference degree obtained after comparison.
And after the abnormal point location is determined, marking out a bad range by taking the position center of the abnormal point location and 5-10m as a radius, and laying a plurality of transition measurement point locations on a boundary line of the bad range for ultrasonic detection or geological radar detection again. Through the step, the worker can relatively quickly determine the abnormal range, unnecessary detection steps are reduced, and the working efficiency is improved.
Upon determination of the anomaly point, advance verification may be performed, which may further include drilling with a drilling apparatus in a step drilling mode that includes temporarily stopping and exiting the drill bit at a point where the hole depth of 1/3, 1/2, 6/5 is reached to verify the water flood rate.
The drilling depth can be more than or equal to the depth of a foundation pit, the drilling mode comprises vertical drilling and inclined drilling, if a soil layer in a construction range is more than hard soil, the inclined drilling is performed, the inclination is less than or equal to 5 degrees, the specific angle can be determined according to the drilling depth, and after the lower end of a drilled hole is drilled to a preset depth, the distance between the breakpoint and the lower end of a vertical standard line is required to be less than 1 m; the above-mentioned drilling depth refers to the length of the lower end head to the ground. The inclined drilling is selected to expand the possibility of water inrush and prevent the blocking interference of local large rocks and other structures. And when the inclined drilling is carried out, the two-way drilling detection is symmetrically carried out at the same base point.
Gush water rate can adopt the floater of a stay cord hoist and mount adaptation drilling, and in the drilling was arranged in to the floater, adopt laser range finder to detect it at appointed interval period, for example: and (4) floating up time within 5 minutes, and calculating the water inrush volume according to the drilling radius so as to calculate the water inrush rate.
After determining that a certain probability of water burst exists in the construction range in the third step, for example: after water gushing at 4 points or water gushing at 2 adjacent points is dispersed, an adaptive drainage system needs to be constructed in the excavation process of the foundation pit.
The construction of the drainage system comprises selecting a drainage area, if no municipal drainage structure or river channel exists near a construction site, excavating, tamping or pouring a temporary open-air pool outside 500m, and the water source inside the temporary open-air pool can be reused for later construction.
After the selection of the drainage area is completed, the quantity and power of the water pumps are selected according to the water burst speed, the water inlet ends of the water pumps are fixed and communicated with the water pumping pipes, and the water inlet ends of the water pumping pipes are provided with filter heads so as to reduce the interference caused by impurity blockage; the water inlet end of the water pumping pipe is arranged in the gushed water, the water outlet end of the water pump is fixed and communicated with the drainage pipe, and the drainage pipe extends to a drainage area.
If the problem of water gushing still exists after a proper foundation pit is excavated, a water guide groove is also formed in the pit bottom, an anchoring drainage bottom layer is laid in the water guide groove, and the drainage bottom layer can be made of rubber leather film; a confluence pit is formed at the bottom of the pit, the water guide groove is communicated with the confluence pit, one end of the water guide groove, which is far away from the confluence pit, is higher than one end of the water guide groove, which is communicated with the confluence pit, and the water inlet end of the water pumping pipe is arranged in the confluence pit. And finally constructing the confluence pit when a subsequent foundation pit is backfilled, tamping the side of the confluence pit for multiple times, and preferably pouring concrete to form reinforcing ribs. Meanwhile, a floating ball liquid level meter can be arranged in the confluence pit for liquid level monitoring, and the current situation of water seepage and water burst can be known in time.
In the process, the staff can anchor a plurality of water guide pipe piles in the water gushing range, the water guide pipe piles are made of concrete, the inner cavities of the water guide pipe piles are filled with sand and stone materials, the upper ends of the water guide pipe piles extend out of the pit bottom, and water below the pit bottom is led out to enhance the tamping effect of the pit bottom.
And subsequently, after the steps of tamping, reinforcing and the like of the foundation pit are completed, backfilling the foundation pit, and constructing the foundation.
In conclusion, the method can be used for predicting whether the construction range has the problem of water inrush before construction, so that the influence on the construction progress is reduced, the potential safety hazard is reduced, and the economic loss is reduced.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A method for treating a foundation, comprising:
analyzing geological data in a construction range, wherein the geological data comprises collecting geological information and past geological disaster information and analyzing possible hazards;
step two, geological survey, which comprises the steps of carrying out geological survey on the construction range according to an analysis result of the step and determining possible abnormal point positions;
step three, advanced verification, which comprises the step of performing drilling verification at abnormal point positions before foundation pit excavation;
fourthly, excavating a foundation pit; if the foundation pit is verified to have the water inrush problem in the third step, constructing an adaptive drainage system;
and step five, foundation forming, namely backfilling the foundation pit to construct the foundation.
2. The foundation treatment method according to claim 1, wherein: the geological measurement comprises the steps of performing primary detection on a construction range by adopting ultrasonic detection equipment, wherein the detection depth is 1.3-1.8 times of the excavation depth of a foundation pit; and acquiring adverse geological signs by ultrasonic detection, and taking the measured point position as an abnormal point position.
3. The foundation treatment method according to claim 1, wherein: the geological measurement also comprises point location determination, wherein the point location determination comprises the steps of determining a plurality of measurement point locations according to the construction range area, drawing a circle by taking the measurement point locations as the circle center, and ensuring that the circle radius is less than or equal to 3m and adjacent circles are circumscribed; the middle points of the connecting lines of the centers of the adjacent circles are also taken as measurement points.
4. A method for foundation treatment according to claim 2 or 3, characterized in that: the geological measurement also comprises measurement verification, wherein after the abnormal point location is found, repeated measurement is carried out for multiple times to verify whether the equipment is abnormal or not and whether the operation error is caused or not; and after the abnormal point location is determined, marking out a bad range by using the position center of the abnormal point location and 5-10m as a radius, and laying a plurality of transition measurement point locations on a boundary line of the bad range to perform ultrasonic detection or geological radar detection again.
5. The foundation treatment method according to claim 1, wherein: and the third step comprises the step drilling mode of drilling holes by using the drilling equipment, wherein the step drilling mode comprises the steps of temporarily stopping and withdrawing the drill bit at the position of the hole depth of 1/3, 1/2 and 6/5 to check the water burst rate.
6. The foundation treatment method according to claim 5, wherein: the construction drainage system comprises a selected drainage area, the quantity and power of the water pumps are selected according to the water inflow rate, the water inlet ends of the water pumps are fixed and communicated with the water pumping pipes, the water inlet ends of the water pumping pipes are provided with filter heads, the water inlet ends of the water pumping pipes are arranged in water flowing out, the water outlet ends of the water pumps are fixed and communicated with the drainage pipes, and the drainage pipes extend to the drainage area.
7. The foundation treatment method according to claim 6, wherein: the construction of the drainage system also comprises a water guide groove formed in the pit bottom, and an anchoring drainage bottom layer is laid in the water guide groove; the confluence pit is arranged at the bottom of the pit, the water guide groove is communicated with the confluence pit, one end of the water guide groove, which is far away from the confluence pit, is higher than one end of the water guide groove, which is communicated with the confluence pit, and the water inlet end of the water pumping pipe is arranged in the confluence pit.
8. The foundation treatment method according to claim 6, wherein: the construction of the drainage system further comprises a plurality of water guide pipe piles anchored in the water gushing range, sand and stone materials are filled in the inner cavities of the water guide pipe piles, and the upper ends of the water guide pipe piles extend out of the pit bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911146076.4A CN110924375A (en) | 2019-11-21 | 2019-11-21 | Foundation treatment method |
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| CN201911146076.4A CN110924375A (en) | 2019-11-21 | 2019-11-21 | Foundation treatment method |
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| CN110924375A true CN110924375A (en) | 2020-03-27 |
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Application publication date: 20200327 |