CN110700270B - Construction method for non-drainage earthwork excavation of ultra-deep foundation pit - Google Patents
Construction method for non-drainage earthwork excavation of ultra-deep foundation pit Download PDFInfo
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- CN110700270B CN110700270B CN201910934136.2A CN201910934136A CN110700270B CN 110700270 B CN110700270 B CN 110700270B CN 201910934136 A CN201910934136 A CN 201910934136A CN 110700270 B CN110700270 B CN 110700270B
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention discloses a construction method for non-drainage earthwork excavation of an ultra-deep foundation pit, which relates to the technical field of foundation pit construction and comprises the following steps of S1, performing enclosure construction on the peripheral side of the foundation pit to be excavated; s2, shallow excavation, namely excavating shallow soil of the foundation pit; s3, grouting slurry, and grouting the slurry in the dug foundation pit; and S4, deep excavation, and carrying out underwater excavation operation on the deep soil of the foundation pit by means of equipment. The method has the advantages of reducing dangerous situations such as confined water inrush and the like, reducing the influence degree of precipitation measures on the surrounding environment of the foundation pit, and reducing the waste of underground water resources.
Description
Technical Field
The invention relates to the technical field of foundation pit construction, in particular to a construction method for non-drainage earthwork excavation of an ultra-deep foundation pit.
Background
The foundation pit is a space below the ground excavated for constructing a foundation and a basement of a building (including a structure), belongs to temporary engineering, and is used for providing a space so that the construction operation of the foundation can be performed according to a position specified by design.
At present, with the increase of high-rise buildings and the increase of building requirements, foundation pit engineering is deeper and deeper. However, in the construction of the ultra-deep foundation pit, dangerous situations such as confined water inrush and the like are easy to occur; moreover, the ultra-deep precipitation measure can generate great flood influence on the surrounding environment of the foundation pit; on the other hand, the daily precipitation of the ultra-deep precipitation is far more than that of the shallow precipitation, so that the underground water resource is irreversibly wasted.
The prior Chinese patent with publication number CN103590425B discloses a construction process of a subway station with a peat soft soil layer, wherein the main structure of the constructed subway station comprises a bottom plate, side walls, a top plate and a middle plate arranged between the top plate and the bottom plate; underground continuous walls are arranged on the outer sides of the two side walls; the bottom plate, the side walls, the middle plate and the top plate are all of reinforced concrete structures poured by waterproof concrete; the construction process of the subway station comprises the following steps: firstly, constructing an underground continuous wall; secondly, foundation reinforcement: reinforcing a foundation of a foundation pit to be excavated by adopting a triaxial mixing pile; thirdly, vacuum dewatering: carrying out vacuum well point dewatering construction on a foundation pit to be excavated; fourthly, excavation of a foundation pit: carrying out earth excavation on a foundation pit to be excavated by dividing a plurality of excavation layers from top to bottom by adopting an open excavation method; and fifthly, constructing the main structure of the subway station.
By adopting the scheme, vacuum precipitation is carried out in the foundation pit, the foundation pit is excavated, the construction process belongs to conventional operation, the problems that dangerous situations such as confined water inrush and the like are very easy to occur in the construction of the ultra-deep foundation pit, the ultra-deep precipitation measures can generate large flood influence on the surrounding environment of the foundation pit, the daily precipitation of the ultra-deep precipitation is far more than that of shallow precipitation, underground water resources are irreversibly wasted and the like are solved, and the improvement part is provided.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a construction method for non-drainage earthwork excavation of an ultra-deep foundation pit.
The technical purpose of the invention is realized by the following technical scheme: a construction method for earth excavation without drainage of an ultra-deep foundation pit comprises the following steps of S1, enclosure construction, wherein the enclosure construction is carried out on the peripheral side of the foundation pit to be excavated; s2, shallow excavation, namely excavating shallow soil of the foundation pit; s3, grouting slurry, and grouting the slurry in the dug foundation pit; and S4, deep excavation, and carrying out underwater excavation operation on the deep soil of the foundation pit by means of equipment.
By adopting the technical scheme, in actual construction, firstly, enclosure construction is carried out on the peripheral side of the foundation pit to be excavated, and the stability of earthwork on the peripheral side of the foundation pit during excavation of the foundation pit is ensured; then, excavating shallow soil; then, filling slurry into the dug foundation pit, and supporting the peripheral soil body and the pit bottom by the static pressure of the slurry; and finally, carrying out underwater excavation operation on the deep layer of the foundation pit. By the method, dangerous situations such as confined water inrush and the like are reduced, the influence degree of precipitation measures on the surrounding environment of the foundation pit is reduced, and the waste of underground water resources is reduced.
The invention is further configured to: the step of S1 includes the following steps: s1.1, arranging a plurality of inserting and beating first tubular piles on the ground around the foundation pit to be excavated, wherein the inserting and beating depth of the first tubular pile enclosure is 1.2-1.5 times of the excavation depth.
By adopting the technical scheme, on one hand, the first tubular pile is inserted and drilled on the ground on the peripheral side of the foundation pit to be excavated, so that the stability of earthwork on the peripheral side of the foundation pit is ensured;
on the other hand, the static pressure of the slurry is used for supporting the peripheral soil body and the pit bottom, so that the short pipe pile can be properly used, the construction difficulty of the pipe pile is reduced, and the construction cost is saved.
The invention is further configured to: first tubular pile is evenly inserted and is beaten the setting and be waiting to dig foundation ditch all sides ground and be formed with first fender stake fence, the outside of first fender stake fence is inserted and is beaten and be provided with the second tubular pile, and the second tubular pile evenly inserts around first fender stake fence all sides and beat and be provided with a plurality of roots and form second fender stake fence, and second fender stake fence and first fender stake fence interval set up.
Through adopting above-mentioned technical scheme, by first tubular pile and the second tubular pile of even setting stabilize foundation ditch week side earthwork, help reducing the condition emergence of foundation ditch week side earthwork landslide.
The invention is further configured to: the step S1 includes the following steps of S1.2, pouring connection concrete between the first tubular pile and the second tubular pile and forming a support top beam.
By adopting the technical scheme, the supporting top beam is used for connecting each first tubular pile and each second tubular pile, the integrity between each first tubular pile and each second tubular pile is improved, a portal support system is formed, the stability of earthwork on the periphery of the foundation pit is improved, and the collapse of the earthwork on the periphery of the foundation pit is further reduced.
The invention is further configured to: in S4, as the foundation pit deepens, slurry is injected into the foundation pit to a corresponding depth.
By adopting the technical scheme, the slurry with the corresponding depth is injected into the foundation pit, so that the slurry in the foundation pit keeps a certain height, the supporting effect of the slurry on the soil and water on the peripheral side of the upper part of the foundation pit is favorably ensured, the occurrence of landslide on the peripheral side of the upper part of the foundation pit is reduced, and the loss of water resources caused by continuous emission of underground water is favorably reduced.
The invention is further configured to: in S2, after the excavation of the shallow layer of the foundation pit is finished, a construction platform is erected above the foundation pit; in S4, dividing the deep earthwork into middle layer soil and bottom layer soil, wherein the middle layer soil is mainly cohesive soil, and the bottom layer soil is mainly sandy soil; s4.1, performing underwater excavation operation on the middle-layer soil on the construction platform by a trenching machine or a slot milling machine; and S4.2, carrying out underwater excavation on the bottom soil of the foundation pit through the drilling and sucking equipment, and excavating to the bottom of the foundation pit.
By adopting the technical scheme, generally speaking, the cohesive soil is mainly used at the depth of 0-30 m, the soil layer below 30 m is mainly sandy soil, the cohesive soil is excavated underwater by the trenching machine or the slot milling machine on the construction platform, and the sandy soil of the foundation pit is excavated underwater by the drilling and sucking equipment, so that the excavation operation of the foundation pit is further realized, and the normal operation of the excavation operation of the foundation pit is ensured.
The invention is further configured to: and S5, bottom cleaning operation, wherein after the foundation pit is excavated, slag and bottom cleaning are carried out on the bottom of the excavated foundation pit and the side wall of the enclosure by means of bottom cleaning equipment, and the foundation pit construction operation is completed.
By adopting the technical scheme, the bottom of the dug foundation pit and the side wall of the enclosure are subjected to slag removal and bottom cleaning, the quality of foundation pit construction is favorably ensured, and the subsequent construction operation of the foundation pit is facilitated.
The invention is further configured to: at S4, the denser slurry of the excavated bottom of the foundation pit is pumped by the second mud pump and discharged out of the foundation pit.
Through adopting above-mentioned technical scheme, in the excavation operation of foundation ditch, a large amount of earth sneak into in the mud, and take place to precipitate along with the earth in the extension mud of time to cause the lower floor concentration of mud too high, draw the more dense mud thick liquid of excavation foundation ditch bottom by the second slush pump, help reducing the resistance of mud to the excavation equipment excavation operation, guarantee that excavation equipment goes on the normal and high efficiency of foundation ditch excavation operation.
The invention is further configured to: a sedimentation tank is arranged on the ground in advance; in S4, the slurry pumped by the second slurry pump is discharged into a settling pond for settling and the supernatant water is discharged.
By adopting the technical scheme, the processing and transporting operation of the deposited earthwork by the workers is greatly facilitated, and the pollution of the slurry to the surrounding environment of the foundation pit is reduced.
The invention is further configured to: a slurry stirring pool or stirring equipment is preset on the ground; in S4, the upper clear water in the sedimentation tank is pumped into a mud stirring tank or stirring equipment by a water pump, soil is added into the mud stirring tank or stirring equipment, mud is formed by stirring, and the mud in the mud stirring tank is pumped into the foundation pit by a first mud pump.
Through adopting above-mentioned technical scheme, draw fresh mud to the foundation ditch upside by first slush pump, help guaranteeing the mud concentration that contains of mud upper strata in the foundation ditch, help guaranteeing the supporting dynamics of mud to the lateral wall upside of foundation ditch week, reduce the condition emergence of the lateral wall upside collapse of foundation ditch week.
Compared with the prior art, the invention has the following beneficial effects:
(1) by filling the slurry in the foundation pit and supporting the soil body around the foundation pit and the bottom of the foundation pit by the static pressure of the slurry, the dangerous situations such as confined water inrush and the like are reduced, the influence degree of precipitation measures on the environment around the foundation pit is reduced, and the waste of underground water resources is reduced;
(2) the pipe piles are inserted into the ground on the periphery of the foundation pit to be excavated, and the connecting concrete is poured between the upper ends of the pipe piles to form the supporting top beams, so that the stability of earthwork on the periphery of the foundation pit is greatly improved, and the collapse of the earthwork on the periphery of the foundation pit is reduced;
(3) and the mud pumped by the second mud pump is comprehensively utilized and discharged into the sedimentation tank for sedimentation, the upper clear water in the sedimentation tank is pumped into the mud stirring tank or the stirring equipment by the water pump, and the mud in the mud stirring tank is pumped to the upper side of the foundation pit by the first mud pump, so that the water liquid is recycled, and the waste of water resources is further reduced.
Drawings
FIG. 1 is a schematic flow chart of a construction method mainly embodying non-drainage earthwork excavation of an ultra-deep foundation pit according to the present embodiment;
fig. 2 is a top view of the present embodiment mainly showing a foundation pit structure;
fig. 3 is a cross-sectional view mainly showing the structure of the foundation pit in the present embodiment;
fig. 4 is a schematic diagram mainly showing the structure of circulation of the slurry and the water for the slurry in the embodiment.
Reference numerals: 1. a foundation pit; 11. shallow layer; 12. middle layer soil; 13. bottom soil; 2. a first tubular pile; 3. a second tubular pile; 4. supporting a top beam; 5. a slurry stirring tank; 6. a sedimentation tank; 7. a first mud pump; 8. a second mud pump; 9. and (4) a water pump.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
The first embodiment is as follows:
referring to fig. 1, a construction method for non-drainage earthwork excavation of an ultra-deep foundation pit includes the following steps,
the construction site is prearranged, the construction site is cleaned, and basic facilities such as a slurry stirring tank 5, a sedimentation tank 6 and the like are arranged on the periphery of the foundation pit 1 to be dug.
S1, performing enclosure construction, namely performing enclosure construction on the peripheral side of the foundation pit to be excavated 1;
s1.1, (see figures 2 and 3) arranging a plurality of inserting and driving first tubular piles 2 on the ground surface around the foundation pit 1 to be excavated, wherein the inserting and driving depth of the first tubular piles 2 is 1.2-1.5 times, preferably 1.5 times of the excavation depth; any two adjacent tubular piles are arranged next to each other, and the first tubular piles 2 are uniformly inserted into the ground around the foundation pit 1 to be excavated and form a first enclosing pile fence; the outer side of the first enclosure pile fence is provided with second tubular piles 3 in an inserting and driving mode, the second tubular piles 3 are evenly arranged around the periphery of the first enclosure pile fence in an inserting and driving mode at intervals and form second enclosure pile fences, and the second enclosure pile fences are arranged with the first enclosure pile fences at intervals. In order to save cost, the second tubular pile 3 is shorter than the first tubular pile 2, and the length of the second tubular pile 3 is 0.4-0.6 times, preferably 0.5 times, the length of the first tubular pile 2;
s1.2, pouring and connecting concrete between the upper ends of the first tubular pile 2 and the second tubular pile 3 to form a supporting top beam 4.
S2, excavating the shallow layer 11 soil of the foundation pit 1 by means of an excavator, wherein the depth of the shallow layer 11 of the foundation pit 1 is 6-8 m;
s2.1, after the shallow layer 11 of the foundation pit 1 is excavated, a construction platform is erected above the foundation pit 1.
S3, grouting the slurry, (see figure 4) the worker can inject water into the slurry stirring pool 5, add soil and fully stir to obtain the slurry; then, the first slurry pump 7 pumps the slurry in the slurry stirring tank 5 to pour the excavated foundation pit 1, and fill the excavated foundation pit 1.
S4, deep excavation, namely dividing deep earthwork into middle soil 12 and bottom soil 13, wherein the middle soil is mainly cohesive soil, and the bottom soil is mainly sandy soil; along with the excavation depth of the foundation pit 1, injecting slurry with a corresponding depth into the foundation pit 1 by means of a first slurry pump 7;
s4.1, performing underwater excavation operation on the cohesive soil on the construction platform by a trenching machine;
and S4.2, carrying out underwater excavation on the sandy soil of the foundation pit 1 through a gas lift reverse circulation drilling machine, and excavating to the bottom of the foundation pit 1.
In the excavation operation of the middle layer soil 12 and the bottom layer soil 13, partial soil is mixed into the slurry bottom layer, and the slurry can be precipitated in long-time placement, so that the concentration of the slurry bottom layer is extremely high, the underwater excavation operation of a trenching machine and a gas lift reverse circulation drilling machine is hindered, the concentration of the slurry upper layer is low, and the supporting effect of the static pressure of the slurry upper layer on the soil body around the foundation pit 1 is greatly reduced.
At the moment, in the deep excavation work, the second slurry pump 8 continuously pumps the thick slurry at the bottom of the excavated foundation pit 1, and the slurry pumped by the second slurry pump 8 is discharged into the sedimentation tank 6 for sedimentation; then, the water pump 9 is used for pumping the upper clear water in the sedimentation tank 6 into the slurry stirring tank 5 and participating in the production of the slurry; and the first slurry pump 7 pumps fresh slurry in the slurry stirring tank 5 and injects the fresh slurry into the upper layer of the slurry in the foundation pit 1. Therefore, the water for stirring the slurry and the water liquid in the foundation pit 1 can be recycled, and the waste of water resources is reduced.
S5, bottom cleaning operation, wherein after the foundation pit 1 is excavated, slag and bottom cleaning are carried out on the bottom of the excavated foundation pit 1 and the inner wall of the first enclosure pile fence by bottom cleaning equipment, and the construction operation of the foundation pit 1 is completed; in this embodiment, the bottom cleaning device is a gas lift reverse circulation drilling machine, and may also be a dredge pump.
Example two:
the construction method for the earth excavation without drainage of the ultra-deep foundation pit has the following difference from the first implementation:
s1, performing enclosure construction, namely performing enclosure construction on the peripheral side of the foundation pit to be excavated 1;
s1.1, the enclosure type can adopt any one of an underground continuous wall, a bored pile row pile, a steel pipe pile row pile, a pile row pile in an SMW construction method, a precast concrete slab pile type retaining wall, a steel sheet pile and the like.
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 (6)
1. A construction method for excavating earth without draining water in an ultra-deep foundation pit is characterized by comprising the following steps,
s1, performing enclosure construction, namely performing enclosure construction on the peripheral side of the foundation pit (1) to be excavated;
s1.1, arranging a plurality of inserting and striking first tubular piles (2) on the ground on the peripheral side of a foundation pit (1) to be excavated, wherein the inserting and striking depth of the enclosure of the first tubular piles (2) is 1.2-1.5 times of the excavation depth; the first tubular piles (2) are uniformly inserted and beaten on the ground around the foundation pit (1) to be excavated and form a first enclosure pile fence, second tubular piles (3) are inserted and beaten on the outer sides of the first enclosure pile fence, a plurality of second tubular piles (3) are uniformly inserted and beaten around the periphery of the first enclosure pile fence to form a second enclosure pile fence, and the second enclosure pile fence and the first enclosure pile fence are arranged at intervals;
s1.2, pouring connecting concrete between the upper ends of the first tubular pile (2) and the second tubular pile (3) to form a supporting top beam (4);
s2, excavating a shallow layer (11), and excavating the soil of the shallow layer (11) of the foundation pit (1);
s3, grouting slurry, namely grouting the slurry into the excavated foundation pit (1);
s4, carrying out deep excavation, and carrying out underwater excavation operation on deep soil of the foundation pit (1) by means of equipment; along with the deepening of the foundation pit (1), injecting slurry with a corresponding depth into the foundation pit (1); dividing the deep earthwork into middle layer soil (12) and bottom layer soil (13), wherein the middle layer soil (12) is mainly cohesive soil, and the bottom layer soil (13) is mainly sandy soil;
s4.1, performing underwater excavation operation on the middle-layer soil (12) by a trenching machine or a slot milling machine;
s4.2, carrying out underwater excavation on the bottom soil (13) of the foundation pit (1) through the drilling and sucking equipment, and excavating to the bottom of the foundation pit (1).
2. The method for constructing the non-drainage earth excavation of the ultra-deep foundation pit as claimed in claim 1,
in S2, after the shallow layer (11) of the foundation pit (1) is excavated, a construction platform is erected above the foundation pit (1);
and S4.1, performing underwater excavation operation on the middle-layer soil (12) on the construction platform by a trenching machine or a slot milling machine.
3. The construction method for the earth excavation without drainage for the ultra-deep foundation pit according to the claim 1 or 2, characterized by comprising the following steps of S5, bottom cleaning operation, and after the foundation pit (1) is excavated, slag cleaning and bottom cleaning are carried out on the bottom of the excavated foundation pit (1) and the side walls of the enclosure by means of bottom cleaning equipment, so that the construction operation of the foundation pit (1) is completed.
4. A method of earth excavation for ultra-deep foundation pits without drainage according to claim 1 or 2, characterized in that in S4, the second slurry pump (8) extracts the thicker slurry at the bottom of the foundation pit (1) and discharges the thicker slurry out of the foundation pit (1).
5. The construction method of the earth excavation without drainage for the ultra-deep foundation pit according to claim 4, wherein a sedimentation tank (6) is arranged on the ground in advance;
in S4, the mud pumped by the second mud pump (8) is discharged into the sedimentation basin (6) for sedimentation, and the supernatant water is discharged.
6. The construction method for the earth excavation without drainage for the ultra-deep foundation pit according to claim 5, wherein a slurry stirring tank (5) or stirring equipment is preset on the ground;
in S4, the upper clear water in the sedimentation tank (6) is pumped into the mud stirring tank (5) or stirring equipment by the water pump (9), mud is added into the mud stirring tank (5) or stirring equipment, mud is formed by stirring, and the mud in the mud stirring tank (5) is pumped into the foundation pit (1) by the first mud pump (7).
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| CN114411756A (en) * | 2022-01-19 | 2022-04-29 | 石家庄铁道大学 | Construction method and construction device for water-rich sand layer subway station open excavation foundation pit without precipitation |
| CN114607187B (en) * | 2022-04-18 | 2023-10-31 | 中国矿业大学 | Shaft type underground parking garage construction method of cast-in-situ supporting structure under slurry |
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| CN101139838B (en) * | 2007-10-15 | 2010-09-01 | 上海市隧道工程轨道交通设计研究院 | Construction method for high artesian area ultra-deep foundation pit |
| CN102605791B (en) * | 2012-04-12 | 2014-10-15 | 中建三局第三建设工程有限责任公司 | Method for excavating soil from soft soil foundation |
| CN105002913B (en) * | 2015-08-06 | 2017-07-11 | 中铁隆工程集团有限公司 | A kind of highly permeable stratum deep basal pit back cover water sealing structure and its construction method |
| CN105239578B (en) * | 2015-08-28 | 2017-05-17 | 中交第二航务工程局有限公司 | Water-rich sand layer deep foundation pit underwater construction method |
| CN106284365A (en) * | 2016-07-23 | 2017-01-04 | 杭州千城建筑设计有限公司 | A kind of WATER-WASHING METHOD of building foundation pit excavation |
| CN107237331B (en) * | 2017-06-14 | 2023-06-02 | 中铁第四勘察设计院集团有限公司 | Foundation pit construction method using water pressure support |
| CN107119691B (en) * | 2017-06-22 | 2023-10-13 | 中交(南京)建设有限公司 | Square deep foundation pit suitable for high bearing pressure of water-rich sand egg layer and excavation method thereof |
| CN107587529B (en) * | 2017-09-13 | 2019-04-30 | 吉林大学 | Gas-water pressure balanced type underground anti-seepage sealing technique and equipment used |
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