CN114108639A - Construction method for foundation pit bottom sealing - Google Patents
Construction method for foundation pit bottom sealing Download PDFInfo
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- CN114108639A CN114108639A CN202111359726.0A CN202111359726A CN114108639A CN 114108639 A CN114108639 A CN 114108639A CN 202111359726 A CN202111359726 A CN 202111359726A CN 114108639 A CN114108639 A CN 114108639A
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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Abstract
The invention discloses a construction method of a foundation pit back cover, which belongs to the technical field of building construction and comprises the following steps: constructing a building enclosure; performing pile forming construction of the first-stage pile: spraying grouting and spraying bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a first-stage grouting pipe, and forming a first slurry column at the bottom of the foundation pit, wherein the first slurry column forms the first-stage pile; and pouring concrete into the first-stage pile by using a first-stage concrete pipe, and discharging slurry of the first-stage pile from a sludge discharge pipe of the first-stage grouting pipe, wherein the concrete occupying the space of the first-stage pile can be solidified to form a first-stage concrete back cover. The invention ensures that the waterproof performance of the foundation pit back cover is good.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for a foundation pit back cover.
Background
In the prior art, in order to solve the problem of confined water inrush in deep foundation pit engineering, a pit bottom grouting reinforcement method is generally adopted. Grouting and reinforcing the pit bottom, namely grouting the pit bottom at one time to form a horizontal sealing bottom.
However, the bottom grouting reinforcement has the following disadvantages: for a foundation pit with a deep depth, the grouting quality is difficult to guarantee, and the bottom sealing has water leakage risk.
Therefore, a method for constructing a bottom seal of a foundation pit is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a construction method of a foundation pit back cover, which aims to solve the technical problem that the foundation pit back cover in the prior art has water leakage risk.
As the conception, the technical scheme adopted by the invention is as follows:
a construction method for sealing the bottom of a foundation pit comprises the following steps:
s1, constructing a building enclosure;
s2, pile forming construction of the first-stage pile is carried out: spraying grouting and spraying bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a first-stage grouting pipe, and forming a first slurry column at the bottom of the foundation pit, wherein the first slurry column forms the first-stage pile;
and S3, pouring concrete into the first-stage pile by using the first-stage concrete pipe, discharging slurry of the first-stage pile from a slurry discharge pipe of the first-stage slurry pipe, and solidifying the concrete occupying the first-stage pile space to form a first-stage concrete back cover.
Optionally, the construction method of the foundation pit back cover further includes the following steps:
s4, pile forming construction of the second-stage pile is carried out: injecting grouting injection bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a second-stage grouting pipe, forming a second slurry column at the bottom of the foundation pit, wherein the second slurry column forms second-stage piles, and each second-stage pile at least has a spatially overlapped part with one first-stage pile;
s5, pouring concrete into the second-stage pile by using a second-stage concrete pipe, discharging mud of the second-stage pile from a mud discharge pipe of the second-stage grouting pipe, enabling the concrete occupying the first-stage pile space and the concrete occupying the second-stage pile space to be gapless and capable of solidifying to form a final concrete bottom seal, and connecting the lower end of the enclosure structure with the final concrete bottom seal.
Optionally, before step S1, the following steps need to be executed:
and S0, calculating the thickness of the final concrete back cover.
Optionally, the step S2 includes:
s21, designing the position of the first mud column;
s22, conducting hole guiding construction of the first-stage grouting pipe of the first-stage pile according to the position of the first mud column;
s23, lowering the primary grouting pipe;
and S24, spraying bentonite slurry or cement slurry by adopting the primary grouting pipe to perform high-pressure spraying and grouting to form the first slurry column.
Optionally, between the step S2 and the step S3, further comprising:
s31, conducting hole guiding construction on the first-stage concrete pipe of the first-stage pile according to the position of the first slurry column;
and S32, lowering the first-stage concrete pipe.
Optionally, the step S4 includes:
s41, designing the position of the second mud column;
s42, conducting hole guiding construction of the second-stage grouting pipe of the second-stage pile according to the position of the second slurry column;
s43, lowering the second-stage grouting pipe;
and S44, spraying bentonite slurry or cement slurry by adopting the second-stage grouting pipe to perform high-pressure spraying grouting to form the second slurry column.
Optionally, between the step S4 and the step S5, further comprising:
s51, conducting hole guiding construction on the second-stage concrete pipe of the second-stage pile according to the position of the second slurry column;
and S52, lowering the second-stage concrete pipe.
Optionally, one second-stage pile is arranged between any two adjacent first-stage piles, and the overlapping length of the adjacent first-stage piles and the adjacent second-stage piles is not less than 1000 mm.
Optionally, in the grouting and spraying bentonite slurry, the bentonite mixing amount is 360kg/m3(ii) a The cement-based slurry contains 360kg/m of cement3。
Optionally, the axial dimension of the secondary pile is greater than the axial dimension of the primary pile, and the depth of the bottom surface of the secondary pile is greater than the depth of the bottom surface of the primary pile.
The construction method of the foundation pit bottom sealing provided by the invention completes the bottom sealing before the foundation pit is excavated. Through the pile-forming construction of the first-stage pile, a pouring space of the first-stage concrete back cover is impacted in the soil body of the foundation pit soil body to be excavated, so that the first-stage concrete back cover can be better formed; the mud of the first-stage pile is in a flowing state, when the first-stage concrete pipe pours concrete into the first-stage pile, the mud of the first-stage pile is discharged from a mud discharge pipe of the first-stage grouting pipe to make space for the concrete, finally the concrete replaces grouting injection bentonite slurry or cement-based slurry, and the concrete occupying the space of the first-stage pile can be solidified to form a first-stage concrete back cover. The one-level concrete back cover can avoid the risk of leaking water. Meanwhile, the primary concrete back cover can play a role in resisting pit bottom uplift, so that the depth of a maintenance structure can be reduced, and the cost is saved; and the primary concrete bottom sealing can also reduce the peripheral ground settlement caused by foundation pit excavation. And excavating the foundation pit after the primary concrete bottom seal reaches the design structural strength.
Drawings
Fig. 1 is a flowchart of a construction method of a foundation pit back cover according to an embodiment of the present invention;
fig. 2 is a top view of a construction envelope according to a second embodiment of the present invention;
FIG. 3 is a schematic plan view of theoretical first-stage piles and second-stage piles provided in the second embodiment of the present invention;
FIG. 4 is a cross-sectional view of a completed first stage pile according to a second embodiment of the present invention;
fig. 5 is a schematic diagram of the hole guiding position distribution of the primary piles and the secondary piles provided by the second embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of the hole distribution of theoretical primary piles and secondary piles provided by the second embodiment of the present invention;
fig. 7 is a schematic diagram of the position distribution of theoretical primary piles and secondary piles provided by the second embodiment of the present invention;
fig. 8 is a schematic diagram of the final concrete back cover after being formed according to the second embodiment of the present invention.
In the figure:
1. an enclosure structure;
2. first-stage piling; 21. a first-stage grouting pipe; 22. a first stage concrete pipe;
3. pile in second stage; 31. a second-stage grouting pipe; 32. a second stage concrete pipe;
4. a foundation pit soil body is to be excavated;
5. and finally, sealing the concrete bottom.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
Example one
Referring to fig. 1, the present embodiment provides a construction method for a foundation pit back cover, which includes the following steps:
s1, constructing the enclosure structure 1;
s2, pile forming construction of the first-stage pile 2 is carried out: injecting grouting injection bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a first-stage grouting pipe 21, and forming a first slurry column at the bottom of the foundation pit, wherein the first slurry column forms a first-stage pile 2; specifically, in the present embodiment, the first-stage piles 2 are distributed in an array;
and S3, pouring concrete into the first-stage pile 2 by using the first-stage concrete pipe 22, discharging slurry of the first-stage pile 2 from a sludge discharge pipe of the first-stage grouting pipe 21, and solidifying the concrete occupying the space of the first-stage pile 2 to form a first-stage concrete back cover.
The construction method for the foundation pit bottom sealing provided by the embodiment comprises the steps of constructing the enclosure structure 1 on a foundation pit soil body 4 to be excavated to partition a pressure-bearing water layer, spraying bentonite slurry or cement slurry to the bottom of the foundation pit by adopting the first-stage grouting pipe 21, forming a first slurry column at the bottom of the foundation pit, forming a first-stage pile 2 by the first slurry column, pouring concrete into the first-stage pile 2 by adopting the first-stage concrete pipe 22, discharging the slurry of the first-stage pile 2 from the sludge discharge pipe of the first-stage grouting pipe 21, and solidifying the concrete occupying the space of the first-stage pile 2 to form the first-stage concrete bottom sealing.
It can be understood that, in the present embodiment, there is no gap between two adjacent first-stage piles 2, and theoretically, the maximum value of the radial coincidence dimension of the two adjacent first-stage piles 2 is 1000 mm. So as to ensure that the piles 2 in each stage can form a gapless primary concrete back cover after the concrete is poured.
In this embodiment, the bottom sealing is completed before the excavation of the foundation pit. Through the pile forming construction of the first-stage pile 2, a pouring space of the primary concrete back cover is impacted in the soil body of the foundation pit soil body 4 to be excavated, so that the primary concrete back cover can be better formed; the mud of the first-stage pile 2 is in a flowing state, when the first-stage concrete pipe 22 pours concrete into the first-stage pile 2, the mud of the first-stage pile 2 is discharged from a mud discharge pipe of the first-stage grouting pipe 21 to make space for the concrete, finally the concrete replaces grouting injection bentonite slurry or cement-based slurry, and the concrete occupying the space of the first-stage pile 2 can be solidified to form a first-stage concrete back cover. And excavating the foundation pit after the primary concrete back cover reaches the design structural strength.
The one-level concrete back cover can avoid the risk of leaking water. Meanwhile, the primary concrete back cover can play a role of pit bottom uplifting, so that the depth of a maintenance structure can be reduced, and the construction cost is saved; and the primary concrete bottom sealing can also reduce the peripheral ground settlement caused by foundation pit excavation.
Example two
Referring to fig. 2 to 8, the present embodiment provides a construction method for a foundation pit back cover, which includes the following steps:
s0, calculating the thickness of the final concrete back cover 5; specifically, the thickness of the final concrete back cover 5 is calculated according to the strength and the anti-floating requirement;
s1, constructing the enclosure structure 1;
s2, pile forming construction of the first-stage pile 2 is carried out: injecting grouting injection bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a first-stage grouting pipe 21, and forming a first slurry column at the bottom of the foundation pit, wherein the first slurry column forms a first-stage pile 2;
s3, pouring concrete into the first-stage pile 2 by using the first-stage concrete pipe 22, discharging slurry of the first-stage pile 2 from a sludge discharge pipe of the first-stage grouting pipe 21, and solidifying the concrete occupying the space of the first-stage pile 2 to form a first-stage concrete back cover;
s4, pile forming construction of the second-stage pile 3 is carried out: injecting grouting injection bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a second-stage grouting pipe 31, forming a second slurry column at the bottom of the foundation pit, forming second-stage piles 3 by the second slurry column, and forming a part of overlapping part between each second-stage pile 3 and one first-stage pile 2 in space; specifically, in this embodiment, the second-stage piles 3 are distributed in an array;
s5, pouring concrete into the second-stage pile 3 by using the second-stage concrete pipe 32, discharging mud of the second-stage pile 3 from a mud discharge pipe of the second-stage grout pipe 31, forming a final concrete back cover 5 by gapless solidification between the concrete occupying the space of the first-stage pile 2 and the concrete occupying the space of the second-stage pile 3, and connecting the lower end of the enclosure structure 1 with the final concrete back cover 5.
It should be noted that, in this embodiment, a distance exists between two adjacent first-stage piles 2, so as to reserve a construction space for second-stage pile 3. That is, the adjacent two first-stage piles 2 do not interfere with each other.
According to the construction method for the foundation pit bottom sealing provided by the embodiment, the second-stage construction is added, namely, when the first-stage piles 2 are constructed, a distance exists between every two adjacent first-stage piles 2, interference between every two adjacent first slurry columns is avoided, and therefore the forming quality of each first-stage pile 2 is good. After the concrete in the first-stage pile 2 is solidified, namely the first-stage concrete bottom sealing is formed, pile forming construction of the second-stage pile 3 is carried out to impact soil between two adjacent first-stage piles 2, namely grouting and spraying bentonite slurry or cement slurry can not impact the concrete in the first-stage pile 2 and only impact the soil, the second-stage pile 3 impacts the soil between the first-stage concrete bottom sealing, and the final-stage concrete bottom sealing 5 is formed after the concrete is poured into the second-stage pile 3, so that the final-stage concrete bottom sealing 5 has no gap and has good water leakage prevention performance.
In this embodiment, the bottom sealing is completed before the excavation of the foundation pit. And finally forming a gapless final concrete bottom seal 5 by the pile-forming construction of the first-stage pile 2 and the pile-forming construction of the second-stage pile 3 and the concrete pouring. The lower end of the envelope structure 1 is connected with the ultimate concrete back cover 5, so that the envelope structure 1 and the ultimate concrete back cover 5 form a whole, the embedding depth required by the envelope structure 1 is reduced, and the construction cost of the envelope structure 1 is reduced. The stability and the stagnant water problem of foundation ditch and envelope 1 have effectively been solved, have improved the security of foundation ditch excavation, have alleviateed the influence to all ring edge borders, have practiced thrift manpower, material resources and time cost.
The final concrete back cover 5 can avoid the risk of water leakage; meanwhile, the final concrete back cover 5 can play a role of pit bottom uplifting, so that the depth of a maintenance structure can be reduced, and the construction cost is saved; and the primary concrete bottom sealing can also reduce the peripheral ground settlement caused by foundation pit excavation.
And (5) after the strength of the final concrete back cover 5 meets the design requirement, performing foundation pit excavation operation.
Specifically, in this embodiment, the first-stage piles 2 are distributed in an array, the second-stage piles 3 are also distributed in an array, one second-stage pile 3 exists between any two adjacent first-stage piles 2, and the maximum length of the overlapping joint between adjacent first-stage piles 2 and adjacent second-stage piles 3 is not less than 1000 mm. Specifically, the primary piles 2 and the secondary piles 3 are circular in cross section. Preferably, the axial dimension of secondary pile 3 is greater than the axial dimension of primary pile 2, and the depth of the bottom surface of secondary pile 3 is greater than the depth of the bottom surface of primary pile 2.
Referring to fig. 3, one secondary pile 3 exists between any adjacent two primary piles 2 in the lateral and vertical directions in fig. 3. Optionally, the bentonite content in the bentonite slurry sprayed by grouting is 360kg/m3(ii) a The cement mixing amount in the cement-based slurry is 360kg/m3。
Specifically, in this embodiment, step S2 includes:
s21, designing the position of the first mud column;
s22, conducting hole guiding construction of the first-stage grouting pipe 21 of the first-stage pile 2 according to the position of the first slurry column; specifically, a drilling machine is adopted to firstly guide a hole to the designed depth of the bottom of the foundation pit;
s23, lowering the first-stage grouting pipe 21; optionally, the diameter of the primary grout pipe 21 is 250 mm;
s24, jetting bentonite slurry or cement slurry by adopting the primary grouting pipe 21 to perform high-pressure jet grouting to form a first slurry column, wherein the first slurry column forms a primary pile 2 to resist water and soil pressure; specifically, the pile diameter of the first-stage pile 2 is 3000 mm; specifically, in the present embodiment, a gap exists between two adjacent first-stage piles 2.
Specifically, the steps between step S2 and step S3 further include:
s31, conducting hole guiding construction on the first-stage concrete pipe 22 of the first-stage pile 2 according to the position of the first slurry column;
s32, placing the first-stage concrete pipe 22; optionally, the diameter of the lead hole of the first-stage concrete pipe 22 is 300mm, and the diameter of the first-stage concrete pipe 22 is 250 mm.
Specifically, in this embodiment, step S4 includes:
s41, designing the position of the second slurry column;
s42, conducting hole guiding construction of the second-stage grouting pipe 31 of the second-stage pile 3 according to the position of the second slurry column;
s43, lowering the second-stage grouting pipe 31; optionally, the diameter of the grouting pipe 31 is 250 mm;
and S44, jetting bentonite slurry or cement slurry by adopting the second-stage grouting pipe 31 for high-pressure jet grouting to form a second slurry column.
Further, in this embodiment, between step S4 and step S5, the method further includes:
s51, conducting hole guiding construction on the second-stage concrete pipe 32 of the second-stage pile 3 according to the position of the second slurry column;
s52, lowering the second-stage concrete pipe 32; optionally, the hole diameter of the lead hole of the second-stage concrete pipe 32 is 300mm, and the pipe diameter of the second-stage concrete pipe 32 is 250 mm.
When the second-stage concrete pipe 32 is bored, it is necessary to control the position of the second-stage concrete pipe 32 from the original first-stage pile 2.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A construction method for a foundation pit back cover is characterized by comprising the following steps:
s1, constructing the enclosure structure (1);
s2, pile forming construction of the first-stage pile (2) is carried out: spraying and grouting bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a first-stage grouting pipe (21), and forming a first slurry column at the bottom of the foundation pit, wherein the first slurry column forms the first-stage pile (2);
s3, pouring concrete into the first-stage pile (2) by using the first-stage concrete pipe (22), and simultaneously discharging slurry of the first-stage pile (2) from a slurry discharge pipe of the first-stage grouting pipe (21), wherein the concrete occupying the space of the first-stage pile (2) can be solidified to form a first-stage concrete back cover.
2. The method for constructing the foundation pit bottom cover according to claim 1, wherein the method for constructing the foundation pit bottom cover further comprises the steps of:
s4, pile forming construction of the second-stage pile (3) is carried out: injecting and grouting bentonite slurry or cement slurry to the bottom of the foundation pit by adopting a second-stage grouting pipe (31), forming a second slurry column at the bottom of the foundation pit, wherein the second slurry column forms the second-stage piles (3), and each second-stage pile (3) and one first-stage pile (2) have a part of overlapping part in space;
s5, pouring concrete into the second-stage pile (3) through the second-stage concrete pipe (32), discharging mud of the second-stage pile (3) through a mud discharge pipe of the second-stage grouting pipe (31), enabling the concrete occupying the space of the first-stage pile (2) and the concrete occupying the space of the second-stage pile (3) to be gapless and capable of solidifying to form an ultimate concrete back cover (5), and connecting the lower end of the enclosure structure (1) with the ultimate concrete back cover (5).
3. The construction method of the foundation pit bottom sealing according to claim 2, wherein before step S1, the following steps are further performed:
and S0, calculating the thickness of the final concrete back cover (5).
4. The construction method of the foundation pit bottom sealing according to claim 2, wherein the step S2 comprises:
s21, designing the position of the first mud column;
s22, conducting hole guiding construction of the primary grouting pipe (21) of the primary pile (2) according to the position of the first mud column;
s23, lowering the primary grouting pipe (21);
and S24, jetting bentonite slurry or cement slurry by adopting the primary grouting pipe (21) to form the first slurry column through high-pressure jet grouting.
5. The construction method of the foundation pit bottom sealing according to claim 2, wherein between the step S2 and the step S3, the method further comprises:
s31, conducting hole guiding construction on the primary concrete pipe (22) of the primary pile (2) according to the position of the first mud column;
and S32, lowering the first-stage concrete pipe (22).
6. The construction method of the foundation pit back cover according to any one of claims 2 to 5, wherein the step S4 comprises:
s41, designing the position of the second mud column;
s42, conducting hole guiding construction on the second-stage grouting pipe (31) of the second-stage pile (3) according to the position of the second slurry column;
s43, lowering the second-stage grouting pipe (31);
and S44, spraying bentonite slurry or cement slurry by adopting the secondary grouting pipe (31) to perform high-pressure spraying grouting to form the second slurry column.
7. The construction method for the foundation pit bottom sealing according to any one of claims 2 to 5, wherein between the step S4 and the step S5, the method further comprises:
s51, conducting hole guiding construction on the second-stage concrete pipe (32) of the second-stage pile (3) according to the position of the second slurry column;
and S52, lowering the second-stage concrete pipe (32).
8. The construction method of the foundation pit bottom sealing according to any one of claims 2-5, characterized in that one second-stage pile (3) is arranged between any two adjacent first-stage piles (2), and the overlapping length of the adjacent first-stage piles (2) and the adjacent second-stage piles (3) is not less than 1000 mm.
9. A method of constructing a foundation pit back cover according to any one of claims 1 to 5, wherein the method is carried out in the presence of a concrete-based groutIn the grouting and spraying bentonite slurry, the mixing amount of the bentonite is 360kg/m3(ii) a The cement-based slurry contains 360kg/m of cement3。
10. A foundation pit bottom-sealing construction method according to any one of claims 2-5, characterized in that the axial dimension of the secondary pile (3) is larger than the axial dimension of the primary pile (2), and the depth of the bottom surface of the secondary pile (3) is larger than the depth of the bottom surface of the primary pile (2).
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