CN110284506A - A kind of foundation pit enclosure method for the expansion construction that deep basal pit is cheated to shallow foundation - Google Patents
A kind of foundation pit enclosure method for the expansion construction that deep basal pit is cheated to shallow foundation Download PDFInfo
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- CN110284506A CN110284506A CN201910431176.5A CN201910431176A CN110284506A CN 110284506 A CN110284506 A CN 110284506A CN 201910431176 A CN201910431176 A CN 201910431176A CN 110284506 A CN110284506 A CN 110284506A
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- foundation
- stake
- deep basal
- cheated
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/58—Prestressed concrete piles
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Foundations (AREA)
Abstract
The present invention relates to a kind of foundation pit enclosure methods for the expansion construction that deep basal pit is cheated to shallow foundation comprising following steps: step 1, the intersection in deep basal pit and shallow foundation hole are pressed into prefabricated tubular pile by piling machine uniform intervals；Step 2, the soft base layer between adjacent two prefabricated tubular piles excavate stake slot by chute forming machine, and lithosphere carries out groove milling by two-wheel flute milling machine, and stake slot is dug to predetermined depth；Bentonite slurry retaining wall is perfused into stake slot during being mined for step 3, stake slot；Step 4, by concrete pump and conduit, into stake slot, bentonite slurry is cemented out and is formed piling wall by concrete perfusion, and piling wall and prefabricated tubular pile form integral strength.In work progress, piling, pore-forming and pore-forming slip casting can almost carry out simultaneously, and compared to the mode of direct cast-in-situ bored pile, the present invention has the effect of quickly forming stake slot, controls convenient for stake slot quality, shortens construction period and lifting construction efficiency.
Description
Technical field
The present invention relates to a kind of foundation pits for the expansion construction that foundation pit enclosure technical field more particularly to deep basal pit are cheated to shallow foundation
Enclosing method.
Background technique
In building construction process, often change original underground foundation because of the adjustment of underground structure function, such as by
In the change of structure function, need underground structure cheating extension from deep basal pit to shallow foundation, thus will be in the base of original foundation pit enclosure
On plinth, axis, pile foundation of bearing platform locating for underground structure, deep basal pit and shallow foundation hole are gone along with sb. to guard him.
In existing technology, Authorization Notice No. is the Chinese patent of CN101270579B, discloses a kind of deep basal pit to shallow
The foundation pit enclosure method of the expansion construction of foundation pit comprising following steps: (1) in the depth foundation pit intersection cushion cap Bian Shangyou is utilized
Cement mixing water-stop curtain is arranged in gap setting cast-in-situ bored pile, outside；(2) shallow foundation cheats earth excavation, and floor structure is constructed, with
Shallow foundation bottom plate carries out drawing anchor, is connect by bent cap with Extra-Deep Foundation Pit, forms overall stiffness；(3) the deep pit diggings region such as
Shallow foundation base plate strength reaches 90% and adjacent foundation base plate strength reaches 70%, when cast-in-situ bored pile intensity reaches 100%,
Carry out deep-foundation pit excavation；(4) construction Deep Foundation Structure.
Prior art among the above, which has the following deficiencies:, to be set in depth foundation pit intersection using the gap cushion cap Bian Shangyou
The mode of cast-in-situ bored pile is set, when especially some soft base layers are constructed, because concrete hardening needs certain time,
Phenomena such as construction period is longer, while quality control difficulty is big, is easy to appear broken pile.
Summary of the invention
The purpose of the present invention is to provide a kind of foundation pit enclosure methods for the expansion construction that deep basal pit is cheated to shallow foundation, have contracting
The advantages of short construction period, lifting construction efficiency.
Above-mentioned purpose of the invention has the technical scheme that
A kind of foundation pit enclosure method for the expansion construction that deep basal pit is cheated to shallow foundation, includes the following steps:
Step 1, cleaning construction site, the intersection in deep basal pit and shallow foundation hole are pressed into prefabricated pipe by piling machine uniform intervals
Stake, and by prefabricated tubular pile indentation foundation soil predetermined depth；
Step 2, the soft base layer between adjacent two prefabricated tubular piles excavate stake slot by chute forming machine, and lithosphere passes through two-wheel groove milling
Machine carries out groove milling, and stake slot is dug to predetermined depth；
Bentonite slurry retaining wall is perfused into stake slot during being mined for step 3, stake slot；
Step 4, by concrete pump and conduit, into stake slot, bentonite slurry is cemented out and is formed piling wall by concrete perfusion,
Piling wall and prefabricated tubular pile form integral strength.
Implement above-mentioned technical proposal, after construction site is cleaned out, then carries out preparation of construction, the machinery that construction is needed
To construction site, the intersection in deep basal pit and shallow foundation hole is pressed into prefabricated tubular pile by piling machine uniform intervals and forms stake for transport
Base forms the construction of chute forming machine after piling machine is successively pressed into adjacent two prefabricated tubular piles between two adjacent prefabricated tubular piles
Space, during piling machine continues to suppress prefabricated tubular pile, chute forming machine can be between two adjacent prefabricated tubular piles
Soft base layer excavated by chute forming machine, and the soft base layer between two adjacent prefabricated tubular piles is dug by chute forming machine
It digs, when encountering lithosphere in chute forming machine mining process, construction personnel can be crushed lithosphere by two-wheel flute milling machine, then
The excavation of stake slot is carried out by chute forming machine, and stake slot is excavated to predetermined depth, and chute forming machine can be to lower a pair of of prefabricated tubular pile
Between carry out the excavation of stake slot the bentonite slurry in mud pit is pumped by slush pump during stake slot is mined
In stake slot, in the case where guaranteeing not spilling over slot, bentonite slurry is injected constantly into stake slot and carries out retaining wall, effectively prevent stake
Slot collapses, and after stake slot grooving, concrete pump and conduit to the stake slot excavated are irrigated concrete and by bentonite mud
Slurry cements out, and forms piling wall after concrete curing,
Piling wall with the prefabricated tubular piles of two sides forms integral strength after solidifying, in entire work progress, piling, grooving and perfusion
Concrete forms piling wall and can almost carry out simultaneously, saves the duration, improves construction efficiency, and fill compared to directly drilling
The mode for infusing stake carries out the excavation of stake slot by chute forming machine between two adjacent prefabricated tubular piles, on the one hand can quickly be formed
On the other hand stake slot carries out the excavation of stake slot in adjacent two prefabricated tubular piles, control compared with directly drilling convenient for quality, in pore-forming
During concrete perfusion, it is less prone to tomography.
The present invention is further arranged to, prefabricated tubular pile described in step 1 be pressed into foundation soil predetermined depth be 15 meters extremely
25 meters, the predetermined depth of stake slot described in step 2 is 8 meters to 12 meters.
Implement above-mentioned technical proposal, the intersection uniform intervals by piling machine in deep basal pit and shallow foundation hole are pressed into prefabricated pipe
Stake, prefabricated tubular pile form pile foundation, the depth of stake slot after being 15 meters to 25 meters according to the predetermined depth of deep basal pit, the predetermined depth of indentation
Degree is less than the depth of prefabricated tubular pile indentation.
The present invention is further arranged to, and the spacing of the adjacent prefabricated tubular pile is 3 meters to 5 meters in step 1.
Implement above-mentioned technical proposal, the spacing of two adjacent prefabricated tubular piles is according to construction environment and construction geology situation
Be set as 3 meters to 5 meters, be conducive to chute forming machine carry out stake slot quick excavation, while be also convenient in the construction process to stake slot into
Row observation is conducive to the quality control of a slot.
The present invention is further arranged to, and prefabricated tubular pile described in step 1 is PHC tubular pole.
Implement above-mentioned technical proposal, PHC tubular pole is a kind of PHC piles, because of bearing capacity of single pile
Height can squeeze into closely knit layer of sand and strongly weathered sand-rock, while PHC Pipe Pile Engineering low cost, and pile extension is quick, in bearing capacity and
It is easily guaranteed in anti-bending strength, therefore, is squeezed into foundation soil using PHC tubular pole as prefabricated tubular pile, saving is constructed into
This, improves construction efficiency.
The present invention is further arranged to, and is cleared up behind construction site in step 1 and is cheated progress well-points dewatering to the shallow foundation.
Implement above-mentioned technical proposal, is cheated in shallow foundation and bury a certain number of filter pipes close to the side of deep basal pit, utilize pumping
Wetting system draws water to filter pipe, so that shallow foundation hole and the intersection of deep basal pit keep dry state, reduces in shallow foundation hole
Underground water penetrated into deep basal pit during deep pit digging.
The present invention is further arranged to, and lithosphere assists creeping by impact drill in step 2.
Implement above-mentioned technical proposal, when lithosphere is arrived in excavation, auxiliary drilling machine is carried out by impact drill, is conducive to it
Chute forming machine carries out the excavation of stake slot afterwards.
The present invention is further arranged to, by the concrete pump and conduit to before the stake slot slip casting in step 3, toward institute
State the precast reinforced cage of decentralization in a slot.
Implement above-mentioned technical proposal, using steel reinforcement cage as skeleton, in stake slot after concrete perfusion, promotes stake slot inner concrete
Intensity.
The present invention is further arranged to, and is carried out drawing anchor with the bottom plate that the shallow foundation is cheated, is connect by bent cap with the piling wall.
Implement above-mentioned technical proposal, is drilled by bent cap to shallow foundation hole, be inserted into anchor cable, then consolidated hole with cement
Get up, load is resisted by the frictional force between the soil body and shallow foundation hole acts on the lateral pressure of piling wall.
In conclusion the invention has the following advantages:
One, in entire work progress, piling, grooving and concrete perfusion form piling wall and can almost carry out simultaneously, save
Duration, construction efficiency is improved, and compared to the mode of direct cast-in-situ bored pile, between two adjacent prefabricated tubular piles
The excavation of stake slot is carried out by chute forming machine, on the one hand can quickly form a slot, is on the other hand carried out in adjacent two prefabricated tubular piles
Stake slot excavates, and controls compared with directly drilling convenient for quality, in pore-forming during concrete perfusion, is less prone to tomography;
Two, the spacing of two adjacent prefabricated tubular piles is set as 3 meters to 5 meters according to construction environment and construction geology situation, has
Stake slot is carried out conducive to chute forming machine quickly to excavate, while being also convenient in the construction process observing stake slot, is conducive to a slot
Quality control；
Three, PHC tubular pole is set by prefabricated tubular pile, PHC tubular pole is a kind of PHC piles, because single pile is held
It is high to carry power, closely knit layer of sand and strongly weathered sand-rock, while PHC Pipe Pile Engineering low cost can be squeezed into, pile extension is quick, is carrying
It is easily guaranteed in power and anti-bending strength, therefore, is squeezed into foundation soil using PHC tubular pole as prefabricated tubular pile, saving is applied
Work cost, improves construction efficiency.
Detailed description of the invention
Fig. 1 is the diagrammatic cross-section of deep basal pit of the embodiment of the present invention and shallow foundation hole intersection；
Fig. 2 is the diagrammatic cross-section that the adjacent two prefabricated tubular piles grooving slip casting of the embodiment of the present invention forms piling wall.
Appended drawing reference: 1, deep basal pit；2, shallow foundation is cheated；3, prefabricated tubular pile；4, stake slot；5, piling wall；6, bent cap.
Specific embodiment
Below in conjunction with attached drawing, the technical solution of the embodiment of the present invention is described.
Embodiment
As shown in Figure 1, for the intersection of deep basal pit 1 and shallow foundation hole 2, the intersection uniform intervals of deep basal pit 1 and shallow foundation hole 2
4 rice grain patterns, which cross piling machine indentation, several prefabricated tubular piles 3, and in the present embodiment, prefabricated tubular pile 3 is the high PHC tubular pole of bearing capacity,
And be pressed at 20 meters of subterranean depth by piling machine, every 3 upper end of prefabricated tubular pile is perfused by reserved steel bar by cast-in-situ template
Bent cap 6 is formed with after concrete.
It is 10 meters of stake that being excavated between adjacent two prefabricated tubular piles 3 by chute forming machine, which has depth, combined with Figure 1 and Figure 2,
Slot 4, there is precast reinforced cage in the interior lower section of stake slot 4, and into stake slot 4, slip casting forms piling wall 5 by slip casting machine.
A kind of foundation pit enclosure method for the expansion construction that deep basal pit is cheated to shallow foundation, the steps include:
Step 1, after construction site being cleaned out, then preparation of construction is carried out, construction is needed mechanical such as piling machine and grooving
To construction site, and in deep basal pit 1, setting deposit has the mud pit of bentonite slurry for the transport such as machine, meanwhile, to shallow foundation hole 2 into
Row well-points dewatering cheats 2 surroundings in shallow foundation and buries a certain number of filter pipes, using vacuum principle, constantly extraction underground water, makes shallow
Groundwater level in foundation pit 2 reduces, and the underground water reduced under shallow foundation hole 2 penetrates into deep base during deep basal pit 1 excavates
In hole 1；
Step 2, in the intersection of deep basal pit 1 and shallow foundation hole 2, the length of 2 intersections is cheated according to deep basal pit 1 and shallow foundation, by beating
4 meters of uniform intervals of machine several prefabricated tubular piles 3 of indentation of stake form pile foundation, and every prefabricated tubular pile 3 is pressed into underground by piling machine
At 20 meters of depth；
Step 3, after being pressed into two adjacent prefabricated tubular piles 3 by piling machine, applying for chute forming machine is formed between two prefabricated tubular piles 3
Work space successively carries out during suppressing of next prefabricated tubular pile 3 in piling machine, and chute forming machine can be to the adjacent of formation pile foundation
Soft base layer between two prefabricated tubular piles 3 carries out the excavation of stake slot 4 by chute forming machine, encounters lithosphere in chute forming machine mining process
When, construction personnel can be crushed lithosphere by the auxiliary of two-wheel flute milling machine combination impact drill, then pass through grooving
Machine, which excavate, forms stake slot 4, and stake slot 4 is excavated at 10 meters of predetermined depth, and the soil that chute forming machine is dug out passes through transport vehicle
Construction site is transported out of, meanwhile, it, will be in mud pit by slush pump during stake slot 4 is mined to 10 meters of predetermined depth
Bentonite slurry is pumped into a slot 4, guarantee do not spill over a slot 4 in the case where, constantly into stake slot 4 inject bentonite slurry into
Row retaining wall effectively prevent a slot 4 to collapse；
Step 4, it is excavated between a pair of adjacent prefabricated tubular pile 3 by chute forming machine after forming a slot 4, construction personnel can be to stake slot
The precast reinforced cage of decentralization in 4, to prevent precast reinforced cage from floating in bentonite slurry, in the fixed bracket in 4 upper end of stake slot, and will
Precast reinforced cage upper end is welded on bracket；
Step 5, the conduit of concrete perfusion is transferred to stake slot 4, and conduit bottom and the gap of 4 bottom of stake slot are not less than
30cm, then be irrigated concrete by concrete pump and conduit to the stake slot 4 excavated and replace bentonite slurry
Out, concrete curing formation piling wall 5 with the continuous rising of concrete surface, needs periodically to promote conduit in the process,
Merogenesis disassembly, until concrete fills a slot 4, the bentonite slurry cemented out is returned in mud pit, to repeat benefit
Integral strength is formed with the prefabricated tubular pile 3 of two sides after being solidified with, piling wall 5；
Step 6, step 2 is repeated to 5, until the foundation pit enclosure that deep basal pit 1 cheats 2 intersections with shallow foundation is formed；
Step 7, every 3 upper end of prefabricated tubular pile passes through by reserved steel bar by forming bent cap 6 after cast-in-situ template concrete perfusion
Bent cap 6 drills to shallow foundation hole 2, is inserted into anchor cable, then hole consolidation is got up with cement, passes through the frictional force between the soil body
The lateral pressure of piling wall 5 is acted on to resist load and shallow foundation hole 2.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of foundation pit enclosure method for the expansion construction that deep basal pit is cheated to shallow foundation, which comprises the steps of:
Step 1, cleaning construction site, it is pre- by the indentation of piling machine uniform intervals in the intersection in deep basal pit (1) and shallow foundation hole (2)
Tubulation stake (3), and by prefabricated tubular pile (3) indentation foundation soil predetermined depth；
Step 2, the soft base layer between adjacent two prefabricated tubular piles (3) excavate stake slot (4) by chute forming machine, and lithosphere passes through double
It takes turns slotter and carries out groove milling, and stake slot (4) are dug to predetermined depth；
Bentonite slurry retaining wall is perfused into stake slot (4) during being mined for step 3, stake slot (4)；
Bentonite slurry is cemented out by concrete pump and conduit to stake slot (4) interior concrete perfusion and forms stake by step 4
Wall (5), piling wall (5) and prefabricated tubular pile (3) form integral strength.
2. the foundation pit enclosure method for the expansion construction that a kind of deep basal pit according to claim 1 is cheated to shallow foundation, feature exist
In the predetermined depth that prefabricated tubular pile described in step 1 (3) is pressed into foundation soil is 15 meters to 25 meters, stake slot described in step 2
(4) predetermined depth is 8 meters to 12 meters.
3. the foundation pit enclosure method for the expansion construction that a kind of deep basal pit according to claim 1 is cheated to shallow foundation, feature exist
In the spacing of the adjacent prefabricated tubular pile (3) is 3 meters to 5 meters in step 1.
4. the foundation pit enclosure method for the expansion construction that a kind of deep basal pit according to claim 1 is cheated to shallow foundation, feature exist
In prefabricated tubular pile described in step 1 (3) is PHC tubular pole.
5. the foundation pit enclosure method for the expansion construction that a kind of deep basal pit according to claim 1 is cheated to shallow foundation, feature exist
In to shallow foundation hole (2) progress well-points dewatering behind cleaning construction site in step 1.
6. the foundation pit enclosure method for the expansion construction that a kind of deep basal pit according to claim 1 is cheated to shallow foundation, feature exist
In lithosphere assists creeping by impact drill in step 2.
7. the foundation pit enclosure method for the expansion construction that a kind of deep basal pit according to claim 1 is cheated to shallow foundation, feature exist
In transferring pre-manufactured steel in the stake slot (4) to before stake slot (4) slip casting by the concrete pump and conduit in step 3
Muscle cage.
8. the foundation pit enclosure method for the expansion construction that a kind of deep basal pit according to claim 7 is cheated to shallow foundation, feature exist
In, with the shallow foundation hole (2) bottom plate carry out drawing anchor, connect by bent cap (6) with the piling wall (5).
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| CN201910431176.5A CN110284506A (en) | 2019-05-22 | 2019-05-22 | A kind of foundation pit enclosure method for the expansion construction that deep basal pit is cheated to shallow foundation |
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| CN201910431176.5A CN110284506A (en) | 2019-05-22 | 2019-05-22 | A kind of foundation pit enclosure method for the expansion construction that deep basal pit is cheated to shallow foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115162355A (en) * | 2022-07-21 | 2022-10-11 | 中煤江南建设发展集团有限公司 | Foundation pit enclosure method for expanding construction from deep foundation pit to shallow foundation pit |
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| CN115162355A (en) * | 2022-07-21 | 2022-10-11 | 中煤江南建设发展集团有限公司 | Foundation pit enclosure method for expanding construction from deep foundation pit to shallow foundation pit |
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