CN111236219A - Construction method for re-expanding basement pile - Google Patents
Construction method for re-expanding basement pile Download PDFInfo
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- CN111236219A CN111236219A CN202010039876.2A CN202010039876A CN111236219A CN 111236219 A CN111236219 A CN 111236219A CN 202010039876 A CN202010039876 A CN 202010039876A CN 111236219 A CN111236219 A CN 111236219A
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- 238000010276 construction Methods 0.000 title claims abstract description 42
- 238000005520 cutting process Methods 0.000 claims abstract description 96
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 54
- 239000010959 steel Substances 0.000 claims abstract description 54
- 239000004567 concrete Substances 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims description 25
- 230000002787 reinforcement Effects 0.000 claims description 18
- 239000003292 glue Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 24
- 230000005484 gravity Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
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- 239000000428 dust Substances 0.000 description 2
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- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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- 239000011241 protective layer Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0266—Enlarging
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Abstract
The invention relates to the technical field of building construction, and discloses a construction method for a re-expanded basement pile, which comprises the following steps: according to the construction scheme, a positioning line is released on the basement structural slab, and vertical supporting pipes are arranged between the basement structural slabs; marking the position of a pile core and a cutting outline; drilling a hoisting hole, and fixedly connecting the hoisting hole to a hoisting device; drilling a cutting hole along the cutting contour, and hanging away a concrete block to form a pile position hole; embedding a steel pile casing in the pile position hole; digging soil along the steel casing to form a hole and pouring a pile; and pulling out the steel casing and backfilling the pile position hole. The method can be used for constructing the pile foundation of the old basement structure re-expansion project, can be used for constructing the re-expansion foundation pile under the condition that the old basement is not disassembled, greatly saves the cost for disassembling and reconstructing the old building, saves the construction cost and has better economic benefit.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for a re-expanded basement pile.
Background
Along with the excessive development of land resources, the urban land area is gradually tense, and the newly developed land resources are less and less, so that the project of the reconstruction and expansion of the old building is more and more. However, for a building with an old basement structure, the original structural plate needs to be processed before the construction of the pile foundation, and the pile foundation construction is carried out after the processing is completed, but the traditional construction method cannot be carried out aiming at a complex re-expansion project with a complex project environment and site.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to realize the pile foundation construction of the old basement structure reconstruction project.
In order to solve the technical problem, the invention provides a construction method for a re-expanded basement pile, which comprises the following steps:
according to a construction scheme, a positioning line is paid out on basement structural slabs, and vertical supporting tubes are arranged between the basement structural slabs according to the positioning line;
marking the position of the pile core and a cutting outline according to the positioning line;
drilling a hoisting hole according to the cutting outline, and fixedly connecting the hoisting hole to a hoisting device;
drilling a cutting hole along the cutting contour, cutting a concrete block and hanging away the concrete block to form a positioning hole;
embedding steel pile casings in the pile position holes corresponding to the basement structure plates;
digging soil along the steel casing to form a hole and pouring a pile;
and pulling out the steel casing and backfilling the pile position hole.
As a preferred scheme, the step of marking the position of the pile core and cutting the contour according to the positioning line specifically comprises:
dividing the basement structural slab into a top slab, a middle slab and a bottom slab;
scribing a circular cutting profile on the top plate and the middle plate;
according to the location line mark the region that the bottom plate was equipped with former tubular pile scratch in the region that is equipped with former tubular pile on the bottom plate and be circular shape cutting profile scratch outside the region that is equipped with former tubular pile on the bottom plate and be square cutting profile.
Preferably, the step of drilling a cutting hole along the cutting contour, cutting a concrete block and lifting away the concrete block to form a pile position hole further comprises:
and when the cutting contour scribed by the bottom plate is circular, cutting the cutting contour layer by layer, removing the reinforcing mesh layer by layer, cutting a concrete block, and hoisting the concrete block to form a pile position hole.
Preferably, the step of drilling a cutting hole along the cutting contour, cutting a concrete block and lifting away the concrete block to form a pile position hole further comprises:
and when the cutting contour scribed by the bottom plate is square, drilling the cutting holes at the four corners of the cutting contour, performing reverse cutting by using a wire saw along the side length of the square by using the cutting holes, cutting a concrete block, and lifting away the concrete block to form a positioning hole.
Preferably, the step of burying a steel casing in the pile position hole of each of the basement structure panels further includes:
and welding a positioning plate on the outer wall of the steel casing, and fixing the positioning plate on each basement structure plate.
Preferably, the step of burying a steel casing in the pile position hole of each of the basement structure panels further includes:
and welding a slurry outlet pipe on the top end of the outer wall of the steel casing, arranging a slurry storage tank in a temporary area which does not influence construction, and connecting the slurry outlet pipe with the slurry storage tank through a rubber hose.
Preferably, in the step of digging soil to form a hole in the underground layer along the steel casing and pouring a pile, the method specifically comprises the following steps:
forming holes in the underground layer in a rotary drilling or impact crushing mode, and injecting slurry into the steel casing by using the slurry storage tank to protect the wall in the process;
drilling/punching to a preset depth and then cleaning the hole;
and hoisting the welded reinforcement cage into the forming hole, and performing underwater concrete pouring on the reinforcement cage to form the column pile.
Preferably, in the step of extracting the steel casing and backfilling the pile position hole, the method further includes:
judging whether the cutting hole of the original tubular pile is in the position of the pile edge of the original tubular pile; if so, curing cement paste in the cutting hole for backfilling; and if not, backfilling the cutting hole by utilizing sand and stone.
Preferably, in the step of paying out a positioning line on the basement structural boards according to the construction scheme and arranging the vertical supporting pipes between the basement structural boards according to the positioning line, the method further comprises the following steps:
according to the positioning line is in the basement structure board mark is used for installing the fixed orifices of crab-bolt, fixes the crab-bolt in through the fixed glue in the fixed orifices, utilizes the crab-bolt is right basement structure carries out reinforcement.
Compared with the prior art, the construction method for the re-expanded basement pile has the beneficial effects that:
according to the invention, the vertical supporting tube is used for temporarily supporting the cutting part, the concrete block is cut according to the cutting outline and is lifted away, the pile position hole is formed, the steel pile casing is embedded through the pile position hole, finally, soil is excavated in the steel pile casing to form a hole, and a column pile is poured, so that the pile foundation construction of the old basement structure reconstruction project is realized.
Drawings
Fig. 1 is a flow chart of a method of re-expanding a basement pile according to a preferred embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, a preferred embodiment of the present invention provides a method for constructing a re-expanded basement pile, including the following steps:
according to a construction scheme, a positioning line is paid out on basement structural slabs, and vertical supporting tubes are arranged between the basement structural slabs according to the positioning line;
marking the position of the pile core and the cutting outline of the pile according to the positioning line;
drilling a hoisting hole according to the cutting outline, and fixedly connecting the hoisting hole to a hoisting device;
drilling a cutting hole along the cutting contour, cutting a concrete block and hanging away the concrete block to form a positioning hole;
embedding steel pile casings in the pile position holes corresponding to the basement structure plates;
digging soil along the steel casing to form a hole and pouring a pile;
and pulling out the steel casing and backfilling the pile position hole.
According to the re-expansion basement pile construction method based on the technical characteristics, the vertical supporting pipe is used for temporarily supporting the cutting position, the concrete block is cut according to the cutting outline and is lifted away, the pile position hole is formed, the steel pile casing is buried through the pile position hole, finally, soil is excavated in the steel pile casing to form a hole, and a pile is poured, so that pile foundation construction of an old basement structure re-expansion project is achieved.
In this embodiment, the step of marking the position of the core and cutting the contour according to the positioning line specifically includes:
dividing the basement structural slab into a top slab, a middle slab and a bottom slab;
scribing a circular cutting profile on the top plate and the middle plate;
according to the location line mark the region that the bottom plate was equipped with former tubular pile scratch in the region that is equipped with former tubular pile on the bottom plate and be circular shape cutting profile scratch outside the region that is equipped with former tubular pile on the bottom plate and be square cutting profile.
Aiming at the roof with the medium plate, only need set up the confession the hole that a steel casing passed, along two-way cross is drawn to pile core position, the cross with the diameter is 0.2 m's hole for hoist and mount is seted up to cutting profile intersection point, and the back is accomplished in the hole for hoist and mount construction, adopts wire rope to fix through HSZ-10 type chain block along diagonal hole site for chain block is in the atress state, just can carry out the hole array construction, along cutting profile is to laying diameter 200mm all around, and interval 190mm hole site is drilled and is passed along the hole site of laying roof or medium plate form cutting hole, concrete block after the cutting is accomplished utilizes chain block to carry out the handling to appointed place breakage, and the big hole that leaves is pile position hole, the diameter in pile position hole is for being greater than the round hole of pile diameter 0.2 m.
Further, the step of drilling a cutting hole along the cutting contour, cutting a concrete block and lifting away the concrete block to form a pile position hole further comprises:
and when the cutting contour scribed by the bottom plate is circular, cutting the cutting contour layer by layer, removing the reinforcing mesh layer by layer, cutting a concrete block, and hoisting the concrete block to form a pile position hole.
Controlling the cutting depth of the first layer to be 0.8m, and removing the first layer of the reinforced mesh concrete structure in a manner of combining a gun machine with a manual air pick; controlling the cutting depth of the second layer to be 0.8m, and removing the second layer of the reinforced mesh concrete structure in a manner of combining a gun machine with a manual air pick; and controlling the cutting depth of the second layer to be 0.3m, and removing the last layer of reinforced concrete structure by using a gun machine. The cutting width of each layer is gradually reduced, the hole-opening removal of the old upright post pile is realized, and the removal of excessive reinforced concrete structures is avoided.
Further, the step of drilling a cutting hole along the cutting contour, cutting a concrete block and lifting away the concrete block to form a pile position hole further comprises:
and when the cutting contour scribed by the bottom plate is square, drilling the cutting holes at the four corners of the cutting contour, performing reverse cutting by using a wire saw along the side length of the square by using the cutting holes, cutting a concrete block, and lifting away the concrete block to form a positioning hole.
Dividing the bottom plate into squares by taking the position of the pile core as the center and deviating 1m outwards according to the pile diameter; drilling holes at four corners of the square, wherein the hole diameter is 200mm, and the hole depth is 2.0 m; and (4) reversely cutting the cut concrete blocks along the side length of the square by using a rope saw by using the drill hole, and then lifting the cut concrete blocks out to transport the concrete blocks to a specified place for crushing. The bottom plate is rapidly opened and removed before the construction of the engineering pile, and the construction efficiency is greatly improved.
In this embodiment, in the step of burying a steel casing in the pile position hole corresponding to each of the basement structure panels, the method further includes: a steel pile casing is embedded by adopting a hydraulic vibration hammer, and the length of the steel pile casing needs to penetrate through the bottom plate of the old basement and a sand layer. And ensuring that the soil is excavated and the hole is formed in the underground layer through the steel casing.
In this embodiment, in the step of burying a steel casing in the pile position hole corresponding to each of the basement structure panels, the method further includes:
and welding a positioning plate on the outer wall of the steel casing, and fixing the positioning plate on each basement structure plate. Because the steel casing belongs to the unsettled state in old basement scope, prevent that steel casing subsides and shift in the pore-forming process, need to carry out reinforcement to steel casing, will steel casing is fixed on old basement structure board.
In this embodiment, in the step of burying a steel casing in the pile position hole corresponding to each of the basement structure panels, the method further includes:
and welding a slurry outlet pipe on the top end of the outer wall of the steel casing, arranging a slurry storage tank in a temporary area which does not influence construction, and connecting the slurry outlet pipe with the slurry storage tank through a rubber hose. The construction method comprises the steps that a mud pit and a mud ditch cannot be directly excavated during construction on an old basement structural slab, so that the mud pit is arranged in a temporary area which does not influence pile construction and traffic, a mud outlet pipe is welded at an opening in the outer wall of the top end of the steel casing, and the mud outlet pipe is connected with the mud pit through a rubber hose, so that a new mud backflow system is formed, and the mud supply for pile construction is guaranteed.
Further, in the step of digging soil to form a hole and pouring a pile along the steel casing to the underground layer, the concrete steps are as follows:
forming holes in the underground layer in a rotary drilling or impact crushing mode, and injecting slurry into the steel casing by using the slurry storage tank to protect the wall in the process;
drilling/punching to a preset depth and then cleaning the hole;
and hoisting the welded reinforcement cage into the forming hole, and performing underwater concrete pouring on the reinforcement cage to form the column pile.
Weathered or slightly weathered granite is regarded as stake end holding power layer in this embodiment adopts, considers engineering progress and pore-forming quality, plans to adopt the mode that the rotary impact combines to accomplish engineering stake pore-forming. Namely, the upper soil layer adopts rotary drilling to form holes, and the lower rock adopts impact crushing to form holes. The method is characterized in that slurry is injected into a slurry retaining wall through a steel retaining cylinder in time according to the soil layer condition in the pore-forming process, the specific gravity of the slurry is reasonably adjusted, pore-forming is continuously carried out without interruption, and the specific gravity and the viscosity of the slurry at the height of the water level in a pore are kept to meet the standard requirements when the machine is stopped so as to prevent the pore from collapsing.
And (3) cleaning the hole after drilling/punching to a preset depth, wherein the engineering pile is deeper, and the hole cleaning adopts a gas lift reverse circulation slag removal method until all indexes of the slurry at the bottom of the hole meet the construction requirements (the specific gravity of the slurry within 500mm of the bottom of the hole is less than 1.25, the viscosity is not more than 28s, the sand content is less than 8 percent, and the colloid content is more than 95 percent).
The process of manufacturing the reinforcement cage comprises the following steps: the joint of the spiral stirrup or the stiffening rib of the reinforcement cage adopts welding, the stiffening rib is connected with the main rib by spot welding, and the spiral stirrup is connected with the main rib by binding. In order to prevent the deformation of the reinforcement cage during transportation and hoisting, the hoisting point position must be reinforced, and stiffening ribs are encrypted if necessary. In order to ensure the thickness of a protective layer of the reinforcement cage, concrete cushion blocks are bound on the outer side of the reinforcement cage at equal intervals in advance, the distance along the pile length is 2m, and the transverse circumference is not less than 4.
Carry and hoist during the steel reinforcement cage, will prevent to warp, lay and aim at the hole site, avoid colliding the hole wall, should fix immediately after the steel reinforcement cage top reaches the design elevation to steel reinforcement cage come-up when exempting from the casting concrete. And after pore forming and hole checking, concrete is poured as soon as possible, the pile concrete can be commercial concrete, and the slump is controlled to be 180-220 mm. When the pile concrete is poured, the distance from the bottom of the guide pipe to the bottom of the hole is kept to be 0.3-0.5 m, and the quantity of the first concrete is required to meet the requirement that the primary embedding depth of the guide pipe is more than 0.8 m. And the forming construction of the column pile is realized.
In this embodiment, in the step of extracting the steel casing and backfilling the pile position hole, the method further includes:
judging whether the cutting hole of the original tubular pile is in the position of the pile edge of the original tubular pile; if so, curing cement paste in the cutting hole for backfilling; and if not, backfilling the cutting hole by utilizing sand and stone. The method can solve the problem that when the original tubular pile is totally or partially invaded into the engineering pile to be constructed, the influence on the construction quality of the engineering pile is caused, and finally, the original tubular pile is restored.
In this embodiment, in the step of paying out a positioning line on the basement structural slab according to the construction scheme and arranging the vertical support pipes between the basement structural slabs according to the positioning line, the method further includes:
according to the positioning line is in the basement structure board mark is used for installing the fixed orifices of crab-bolt, fixes the crab-bolt in through the fixed glue in the fixed orifices, utilizes the crab-bolt is right basement structure carries out reinforcement.
The fixed orifices are strictly constructed according to the design requirements, the aperture is 28mm, the hole depth is 210mm, and the original structural steel bars are avoided as much as possible during drilling. And cleaning dust around the drill hole, cleaning the hole by using an air pump and a brush, and finally cleaning and drying the inside of the fixed hole after cleaning. And (3) tightly plugging the cleaned fixing hole by using clean cotton threads before the anchor bolt is installed so as to prevent dust and foreign matters from falling into the fixing hole.
When the anchor bolt is installed, the glue injection gun nozzle is inserted into the fixing hole, glue is slowly injected into the hole, the glue injection amount is measured by filling the hole with fixing glue after the anchor bolt is inserted, and the fixing glue overflows from the hole. And (4) obviously marking the rust removing end of the treated anchor bolt according to the implantation depth (12 d-15 d, d is the diameter of the anchor bolt), inserting the anchor bolt into the hole, slowly rotating the anchor bolt in the same direction while inserting the anchor bolt until the bottom of the hole is reached, and at the moment, the fixing glue overflows from the hole. The embedded anchor bolts are protected against swinging or collision within the curing time of the anchoring glue. After the anchor bolt is solidified by using the fixing glue, according to the field construction condition, a steel wedge is adopted to penetrate into a gap between the anchor plate and the concrete plate if necessary, and dry and hard cement mortar is adopted to plug the gap between the anchor plate and the concrete.
To sum up, the embodiment of the invention provides a construction method for a re-expanded basement pile, which has the following advantages: (1) the pile foundation construction of the old basement structural slab re-expansion is realized by adopting the mode of perforating the old basement structural slab and combining the steel casing, the old basement does not need to be dismantled, and the construction cost is greatly saved; (2) different holes are formed for different basement structural plates, so that the influence of the original tubular pile on the construction engineering pile is avoided; (3) the steel casing is combined with a new slurry backflow system, so that the prevention and treatment of the hole wall collapse in the construction process of the engineering pile are realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A construction method for re-expanding basement piles is characterized by comprising the following steps:
according to a construction scheme, a positioning line is paid out on basement structural slabs, and vertical supporting tubes are arranged between the basement structural slabs according to the positioning line;
marking the position of the pile core and a cutting outline according to the positioning line;
drilling a hoisting hole according to the cutting outline, and fixedly connecting the hoisting hole to a hoisting device;
drilling a cutting hole along the cutting contour, cutting a concrete block and hanging away the concrete block to form a positioning hole;
embedding steel pile casings in the pile position holes corresponding to the basement structure plates;
digging soil along the steel casing to form a hole and pouring a pile;
and pulling out the steel casing and backfilling the pile position hole.
2. The method for constructing a re-expanded basement pile according to claim 1, wherein the step of cutting the contour and the position of the core marked according to the positioning line includes:
dividing the basement structural slab into a top slab, a middle slab and a bottom slab;
scribing a circular cutting profile on the top plate and the middle plate;
according to the location line mark the region that the bottom plate was equipped with former tubular pile scratch in the region that is equipped with former tubular pile on the bottom plate and be circular shape cutting profile scratch outside the region that is equipped with former tubular pile on the bottom plate and be square cutting profile.
3. The method of constructing a re-expanded basement pile according to claim 2, wherein said step of drilling a cut hole along said cut contour, cutting a concrete block and lifting away said concrete block to form a pile position hole further comprises:
and when the cutting contour scribed by the bottom plate is circular, cutting the cutting contour layer by layer, removing the reinforcing mesh layer by layer, cutting a concrete block, and hoisting the concrete block to form a pile position hole.
4. The method of constructing a re-expanded basement pile according to claim 2, wherein said step of drilling a cut hole along said cut contour, cutting a concrete block and lifting away said concrete block to form a pile position hole further comprises:
and when the cutting contour scribed by the bottom plate is square, drilling the cutting holes at the four corners of the cutting contour, performing reverse cutting by using a wire saw along the side length of the square by using the cutting holes, cutting a concrete block, and lifting away the concrete block to form a positioning hole.
5. The method for constructing a re-expanded basement pile according to claim 1, wherein the step of burying a steel casing in the pile position hole of each basement structure slab further comprises:
and welding a positioning plate on the outer wall of the steel casing, and fixing the positioning plate on each basement structure plate.
6. The method for constructing a re-expanded basement pile according to claim 1, wherein the step of burying a steel casing in the pile position hole of each basement structure slab further comprises:
and welding a slurry outlet pipe on the top end of the outer wall of the steel casing, arranging a slurry storage tank in a temporary area which does not influence construction, and connecting the slurry outlet pipe with the slurry storage tank through a rubber hose.
7. The method for constructing a re-expanded basement pile according to claim 6, wherein in the step of digging a hole in the underground layer along the steel casing and pouring a pile, the method comprises:
forming holes in the underground layer in a rotary drilling or impact crushing mode, and injecting slurry into the steel casing by using the slurry storage tank to protect the wall in the process;
drilling/punching to a preset depth and then cleaning the hole;
and hoisting the welded reinforcement cage into the forming hole, and performing underwater concrete pouring on the reinforcement cage to form the column pile.
8. The method for constructing a re-expanded basement pile according to claim 2, wherein in the step of extracting the steel casing and backfilling the pile site hole, the method further comprises:
judging whether the cutting hole of the original tubular pile is in the position of the pile edge of the original tubular pile; if so, curing cement paste in the cutting hole for backfilling; and if not, backfilling the cutting hole by utilizing sand and stone.
9. The method for constructing a re-expanded basement pile according to any one of claims 1 to 8, wherein in the step of laying out positioning lines on basement structural slabs according to a construction scheme and arranging vertical support pipes between the basement structural slabs according to the positioning lines, further comprising:
according to the positioning line is in the basement structure board mark is used for installing the fixed orifices of crab-bolt, fixes the crab-bolt in through the fixed glue in the fixed orifices, utilizes the crab-bolt is right basement structure carries out reinforcement.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914653A (en) * | 2021-11-08 | 2022-01-11 | 中建四局第一建设有限公司 | Basement layer adding transformation process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0220768A (en) * | 1988-07-08 | 1990-01-24 | Takenaka Komuten Co Ltd | Basement extension method for existing building |
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| CN101787718A (en) * | 2010-02-10 | 2010-07-28 | 上海智平基础工程有限公司 | Casing construction method for reinforcing underground building and structure foundation |
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| CN108005399A (en) * | 2017-10-31 | 2018-05-08 | 上海市政工程设计研究总院（集团）有限公司 | Add the construction method for building multi-layer underground space under a kind of existing building group |
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| CN101787718A (en) * | 2010-02-10 | 2010-07-28 | 上海智平基础工程有限公司 | Casing construction method for reinforcing underground building and structure foundation |
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