CN107178085B - A kind of prefabricated pitching pile-anchor pole monoblock type foundation pit enclosure structure construction method - Google Patents
A kind of prefabricated pitching pile-anchor pole monoblock type foundation pit enclosure structure construction method Download PDFInfo
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- CN107178085B CN107178085B CN201710531879.6A CN201710531879A CN107178085B CN 107178085 B CN107178085 B CN 107178085B CN 201710531879 A CN201710531879 A CN 201710531879A CN 107178085 B CN107178085 B CN 107178085B
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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 kind of prefabricated pitching pile-anchor pole monoblock type foundation pit enclosure structure construction methods, it is characterized by: by step (1) levelling of the land, (2) construction crown beam and pipe casing, (3) first stage soil layer excavates, (4) first stage prefabricated pile is in place, pitching pile, (5) first of purlin of construction and pipe casing, (6) press strip with holes is installed, (7) anchor bolt construction, (8) first of concrete topping is sprayed, (9) second stage preformed pile connecting, pitching pile, (10) step (5)-step (10) are repeated, until completing the construction of building enclosure.The advantage is that: the present invention forms whole foundation pit enclosure structure using structure pile and anchor pole, pipe casing is equipped in crown beam and purlin structure, according to cutting depth " segmentation pile extension; segmentation pitching pile; anchor pole segmentation is gone along with sb. to guard him ", Underground Construction finishes, crown beam, purlin, pipe casing, prefabricated pile etc. can part or all of recycling and reusing, have certain economic benefit.
Description
Technical field
The invention belongs to technical field of civil engineering, and in particular to a kind of prefabricated pitching pile-anchor pole monoblock type foundation pit enclosure knot
Structure construction method.
Background technique
In deep basal pit and other underground engineering constructions, it is commonly encountered deep foundation pit support problem, excavates that difficulty is big, the duration
It is long, costly, the 10%-20% of basic civil engineering total cost is typically constituted from, the cost of big deep-foundation pit engineering becomes up to 30%-40%
A critically important research topic in urban construction.Cause Construction of Deep Excavation Engineering cost high the type selecting of building enclosure
How one of key factor, can be under the premise of guaranteeing deep basal pit safe construction, and saving construction cost to the greatest extent is
The important directions that we need to study can be recycled all or part of building enclosure and recycle, from new technical measures and work
Skill novel aspects, which are broken through, has certain realistic meaning to reduction Construction of Deep Excavation Engineering cost.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to now provide, one kind is recyclable, and easy for construction is prefabricated slotting
Stake-anchor pole monoblock type foundation pit enclosure structure construction method.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows: a kind of prefabricated pitching pile-anchor pole monoblock type foundation pit
Construction method of enclosure structure, innovative point are: by step (1) levelling of the land, (2) construction crown beam and pipe casing, (3) first
First of purlin that stage soil layer excavates, (4) first stage prefabricated pile is in place, pitching pile, (5) are constructed and pipe casing, (6) installation are with holes
First of concrete topping, (9) second stage preformed pile connecting, pitching pile, (10) repetition are sprayed in press strip, (7) anchor bolt construction, (8)
Step (5)-step (8), until completing the construction of building enclosure, described specific step is as follows:
(1) levelling of the land: being axis vertical take-off by field division according to the measurement control point of construction area and physical relief
Site elevation is smoothed at the absolute altitude for the crown beam that arrangement and method for construction determines by several plot first by the way of mechanically or manually, or
It is smooth to dig to the high above 300mm of crown beam top mark, then by the way of hand excavation to Guan Liangdibiaogaochu, formation crown beam groove,
The crown beam ditch groove width is 150-200mm more roomy than the crown beam of design, to reserve installment work face appropriate；
(2) construction crown beam and pipe casing: firstly, being passed through using anchor pole a on the floor with holes of the left and right ends steel pipe casing a
Wear anchor hole hole, and squeeze into soil layer and fix steel pipe casing a；Then, using step (1) construction complete crown beam groove as
The interior side form and bed die of crown beam, outer side mold use combined steel formwork or plywood form, and crown beam steel reinforcement cage hangs, concreting
After, it conserves in time, removes outer side mold, 8-15 root steel tie a and crown beam should be respectively welded in the both sides steel pipe casing a
Drawknot is carried out, drawknot is segmented, is segmented casting concrete, until whole constructions of crown beam are completed, meanwhile, crown beam and pile protection pipe construction
After, using base soil as support, first of cross-brace of construction can be carried out according to design requirement；
(3) first stage soil layer excavates: determining the actual distribution situation of soil layer in foundation pit, each soil layer is determined in advance suitably
Excavation plan excavates principle according to layer and section, and every layer of cutting depth is 400mm-500mm；
(4) first stage prefabricated pile is in place, pitching pile: while soil layer excavates, in construction is completed in step (2) crown beam
Pipe casing a on the basis of, by the way of static press piling by first stage prefabricated pile alignment procedures (2) construction complete pipe casing
A carries out pitching pile, and the bottom absolute altitude of first stage prefabricated pile is always maintained at lower than the position below excavation face 1m in soil layer digging process
It sets；
(5) install first of purlin and pipe casing: the preparation before purlin construction is identical as step (2) crown beam construction,
It is first passed through using anchor pole b and wears anchor hole hole on the floor with holes of the left and right ends steel pipe casing b, and squeezed into steel pile in soil layer
Casing b is fixed, and excavates out purlin groove, and 8-15 root steel tie b and reinforced concrete should be respectively welded in the both sides the pipe casing b
Fortifield village's purlin carries out drawknot, is segmented drawknot, is segmented casting concrete, until the installation of purlin is completed, meanwhile, purlin and pile protection
After pipe construction, using base soil as support, construction second cross-brace can be carried out according to design requirement；
(6) install press strip with holes: press strip with holes is made of steel plate, according to the position of subsequent anchor bolt construction, spacing, is used
The mode of machine drilling is stayed on the steel plate sets out anchor pole location hole, and the press strip with holes is connected by screw bolts constructs in step (4)
On the prefabricated pile of completion；
(7) it anchor bolt construction: is drilled according to the determining anchor pole hole location of design, aperture, length, gradient, is drilled into design
After depth, using pressure wind flushing hole, anchor pole c and Grouting Pipe are inserted by the anchor pole location hole on press strip with holes in step (6),
Slip casting, maintenance, tensioning and sealing off and covering anchorage is carried out to work；
(8) spray first of concrete topping: gunite concrete cement is portland cement, ordinary portland cement or mine
Slag portland cement, coarse aggregate are the mixture of rubble, cobble or both, and the coarse aggregate cobble-stone diameter is 5-10mm, thin bone
Material is medium-fine sand, and the fine aggregate cobble-stone diameter is 2-3mm；
(9) second segment preformed pile connecting, pitching pile: second segment prefabricated pile and the first stage of step (4) construction completion is pre-
Stake processed is through row pile extension, before carrying out pitching pile again after preformed pile connecting, need to first loosen the press strip with holes that step (6) construction is completed, really
Pitching pile, pile sinking can be continued by protecting prefabricated pile, and using being welded to connect, throat depth is less than between prefabricated pile and pipe casing preformed pile connecting
Maximum interspace, in work progress, the bolt connection of press strip and prefabricated pile with holes can first control the 30-40% or so in sum,
After excavating to whole soil layers, complete all to be bolted work in time；
(10) above step (5)-step (8) are repeated, until completing the construction of building enclosure.
Further, the step (2) and crown beam in step (5) and purlin are that armored concrete or pre-manufactured steel are poured in scene
Reinforced concrete, crown beam and purlin are connect with pipe casing by cast in situs connection or grout sleeve, crown beam and purlin sectional dimension
Highly equal with pipe casing height not less than 500mm × 500mm, pipe casing is hollow steel pipe, and wall thickness is not less than 20mm, shape
For rectangle or circle.
Further, steel tie length is 800-1000mm, the steel tie diameter in the step (2) or (5)
For 12-20mm, the steel tie should be connect with reinforcement welding inside crown beam or purlin, and the welded connecting rate is steel tie
The 70%-100% of sum.
Further, prefabricated pile is steel-pipe pile, wall thickness 16-20mm, section minimum dimension in the step (4) and (9)
Each side size for 500mm, prefabricated pile is 8-10mm smaller than pipe casing inner section size.
Further, press strip with holes is steel plate materials in the step (6), press strip with holes with a thickness of 12mm, width is
100mm, the hole on press strip with holes are 2mm bigger than design anchor pole sectional dimension.
Beneficial effects of the present invention are as follows:
(1) present invention forms whole foundation pit enclosure structure using structure pile and anchor pole, in crown beam and purlin structure
Equipped with pipe casing, according to cutting depth " segmentation pile extension, is segmented pitching pile, and anchor pole segmentation is gone along with sb. to guard him ", Underground Construction is finished, and is suitble to
It is applied widely in the foundation pit of a variety of depth；
(2) crown beam and purlin of the present invention are cast-in-situ steel reinforced concrete or prefabricated reinforced concrete, and materials are extensive, construction party
Just, cheap, the co-operation effect of intensity height and reinforcing bar is good；
(3) crown beam of the present invention, purlin, pipe casing, prefabricated pile etc. can part or all of recycling and reusing, reduce engineering
Cost has certain economic results in society.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
Embodiment 1
A kind of prefabricated pitching pile-anchor pole monoblock type foundation pit enclosure structure construction method, the specific steps are as follows:
(1) levelling of the land: being axis vertical take-off by field division according to the measurement control point of construction area and physical relief
Several plot.Be divided into 20 meters of grid between selection, and with the ground elevation in each crosspoint of grid, as calculate project amount and
The foundation of organizing construction.It first by the way of mechanically or manually, requires, the soil layer in place is carried out flat according to arrangement and method for construction
It is whole, and it is appropriate dig out extra soil layer, by site elevation be smoothed to arrangement and method for construction determine crown beam absolute altitude at, then use people
The mode that work is excavated is dug to Guan Liangdibiaogaochu, and crown beam groove is formed, and crown beam ditch groove width should be 150mm more roomy than design crown beam, with
Just installment work face appropriate is reserved；
(2) construction crown beam and pipe casing: crown beam is cast-in-situ steel reinforced concrete crown beam, and sectional dimension is 500mm × 500mm,
Pipe casing is rectangle hollow steel pipe, and wall thickness 20mm is highly equal with the depth of section of crown beam.Firstly, being passed through using anchor pole a
Anchor hole hole is worn on the floor with holes of the left and right ends pipe casing a, and squeezes into soil layer and fixes steel pipe casing；Then, with step
Suddenly interior side form and bed die of the crown beam groove that (1) construction is completed as crown beam, outer side mold use combined steel formwork, crown beam steel reinforcement cage
It hangs, after concreting, conserves in time, remove outer side mold, guarantee the complete and smooth of crown beam lateral surface, in order to the later period
The installation accuracy of cross-brace, pipe casing a are connect with crown beam by cast in situs, and 8 drawknots are respectively welded in the both sides pipe casing a
Reinforcing bar a and crown beam carry out drawknot, and steel tie a diameter is 12mm, length 800mm, steel tie a and crown beam inside steel bar welding
It connects in succession, welded connecting rate is the 70% of steel tie a sum, is segmented drawknot, casting concrete is segmented, until completing crown beam
Installation；Meanwhile after crown beam and pile protection pipe construction, using base soil as support, it can construct according to design requirement
First of cross-brace；
(3) first stage soil layer excavates: " the geotechnical engineering investigation report " that unit provides is seeked advice from according to geotechnical engineering investigation,
Determine the actual distribution situation of soil layer in foundation pit, suitable excavation plan is determined in advance in each soil layer.It is excavated according to layer and section former
Then, every layer of cutting depth control is 400mm, carries out foundation pit protected working in every layer of digging process, forbids to backbreak, the row of carrying out
Water conservancy project is made, while excavation of foundation pit should be combined with prefabricated pile pitching pile technique, guarantee the safety of excavation face；
(4) first stage prefabricated pile is in place, pitching pile: prefabricated pile is steel-pipe pile, with a thickness of 16mm, cross section minimum dimension
For 500mm, each side size of prefabricated pile is 8mm smaller than the pipe casing a inner section size that step (2) construction is completed.Step (3) soil layer is opened
While digging, prefabricated pile, that is, Liftable is in place, and lifting machine slings pile body, the pile protection in crown beam completed with step (2) construction
On the basis of pipe, the pipe casing a that prefabricated pile alignment procedures (2) construction is completed is subjected to pitching pile, pitching pile process must not strongly squeeze stake
Casing, strict control pile body verticality.Soil layer digging process, prefabricated pile are carried out pitching pile by the way of static press piling immediately, sunk
Stake, and guarantee that the bottom absolute altitude of prefabricated pile is always maintained at lower than the position below excavation face 1m in soil layer digging process；
(5) construct first of purlin and pipe casing: purlin is cast-in-situ steel reinforced concrete purlin, sectional dimension be 500mm ×
The depth of section of 500mm, wall thickness 20mm, purlin are equal with pile protection b pipe height.Preparation and step before purlin construction
(2) crown beam is identical in, is first passed through with anchor pole b and wears anchor hole hole on the floor with holes of the left and right ends pipe casing b, and squeezed into soil layer
Steel pipe casing b is fixed, and excavates out purlin groove, pipe casing b is connect with purlin cast in situs, and the both sides pipe casing b should be divided
Not Han Jie 8 steel ties and purlin carry out drawknot, steel tie diameter is 12mm, length 800mm, steel tie and purlin
Internal reinforcement welding connection, welded connecting rate are the 70% of steel tie sum, are segmented drawknot, are segmented casting concrete, until complete
At the installation of cast-in-situ steel reinforced concrete purlin.What the position pipe casing b and step (2) construction in whole purlin structure were completed
The position pipe casing a in crown beam structure is corresponding, strict tolerances range, it is ensured that the accuracy and spirit of subsequent prefabricated pile pitching pile
Activity.Meanwhile after purlin and pile protection pipe construction, using base soil as support, construction second can be carried out according to design requirement
Road cross-brace；
(6) install press strip with holes: press strip with holes is made of steel plate, and press strip with holes is pressed with a thickness of 12mm, width 100mm
Position, spacing according to subsequent anchor bolt construction are stayed on the steel plate by the way of machine drilling and set out anchor pole location hole, press strip with holes
On hole should be 2mm bigger than design anchor pole sectional dimension, when in-site installation press strip with holes, press strip with holes is connected by screw bolts in step
Suddenly on the prefabricated pile that (2) construction is completed, it can flexibly pacify and tear open；
(7) anchor bolt construction: should get out the materials such as reinforcing bar, cement and sand according to design requirement before anchor bolt construction, rationally select
With drilling machine and its corollary equipment, such as drilling machine, the cutting machine of screwing steel bars, electric welding machine, welding machine, anchor pole grouting are used
Blender, mudjack etc..The cement and sand used when should be by construction before aperture is strong by the match ratio progress mortar of design code
Degree experiment and reinforcement welding intensity experiment.It is drilled according to anchor pole hole location, aperture, length, gradient determined by design,
After drilling to completion, using pressure wind flushing hole, the hole location on press strip with holes completed by step (6) construction is inserted into anchor pole
C and Grouting Pipe carry out slip casting, maintenance, tensioning and sealing off and covering anchorage and work；
(8) spray first of concrete topping: gunite concrete is portland cement, and coarse aggregate is hard durable broken
Stone, cobble-stone diameter 5mm, fine aggregate are medium-fine sand, partial size 2mm.When there is freeze proof or seepage resistance demand, strength of cement is unsuitable low
In 42.5 grades, and intensity check test should be done before use, when using alkaline accelerator, must not use contain reactive silica
The building stones of silicon；
(9) second stage prefabricated pile and step (4) construction second stage preformed pile connecting, pitching pile: are completed into prefabricated pile warp
Row pile extension, since the condition of jack technique limits, preformed pile connecting must be using being welded to connect, and throat depth is no more than prefabricated
Maximum interspace between stake and pipe casing.It, can since the press strip with holes that step (6) construction is completed is connected by screw bolts on prefabricated pile
Flexibly peace is torn open, and when step (7), construction is finished, and after concrete topping reaches the intensity of design design requirement, excavation of foundation pit face has
Certain safety, before carrying out pitching pile again after preformed pile connecting, need to first loosen can by bolt and prefabricated pile in step (6)
The press strip with holes flexibly removed, it is ensured that prefabricated pile can continue pitching pile, pile sinking.In work progress, the spiral shell of press strip and prefabricated pile with holes
It tethers and connects quantity and can first control 30% or so of sum, after excavating to whole soil layers, complete all to be bolted work in time
Make.Design is second safeguard procedures to whole building enclosure using press strip with holes to be connect with prefabricated pile, in work progress
It should pay much attention to, can not use inferior materials and turn out substandard goods；
(10) above step (5)-step (8) are repeated, until completing the construction of building enclosure.
Embodiment 2
A kind of prefabricated pitching pile-anchor pole monoblock type foundation pit enclosure structure construction method, the specific steps are as follows:
(1) levelling of the land: being axis vertical take-off by field division according to the measurement control point of construction area and physical relief
Several plot, it is first by the way of mechanically or manually, site elevation is smooth to the high above 300mm of crown beam top mark, then using people
The mode that work is excavated is dug to Guan Liangdibiaogaochu, and crown beam groove is formed, and crown beam ditch groove width is 200mm more roomy than the crown beam of design, with
Just installment work face appropriate is reserved；
(2) construction crown beam and pipe casing: crown beam is prefabricated reinforced concrete crown beam, and sectional dimension is 550mm × 550mm,
Pipe casing is circular hollow steel pipe, and wall thickness 30mm is highly equal with the depth of section of crown beam.Firstly, being passed through using anchor pole
Anchor hole hole is worn on the floor with holes of the left and right ends steel pipe casing a, and squeezes into soil layer and fixes steel pipe casing a；Then,
Using the crown beam groove that step (1) construction is completed as the installation slot position of prefabricated reinforced concrete crown beam, prefabricated reinforced concrete hat
Beam is connect with steel pipe casing a by grout sleeve, and 15 steel ties and pre-manufactured steel should be respectively welded in the both sides steel pipe casing a
Reinforced concrete crown beam carries out sleeve grouting drawknot, and steel tie diameter is 20mm, and the length of steel tie is 1000mm, drawknot steel
Muscle is connect with reinforcement welding inside purlin, and welded connecting rate is the 100% of steel tie sum, is segmented drawknot, and segmentation pours coagulation
Soil, until completing the installation of armored concrete purlin；Meanwhile after crown beam and pipe casing a construct, using base soil as
Support can carry out first of cross-brace of construction according to design requirement；
(3) first stage soil layer excavates: determining the actual distribution situation of soil layer in foundation pit, each soil layer is determined in advance suitably
Excavation plan excavates principle according to layer and section, and every layer of cutting depth is 500mm；
(4) first stage prefabricated pile is in place, pitching pile: prefabricated pile is steel-pipe pile, wall thickness 16mm, and section minimum dimension is
Each side size of 600mm, prefabricated pile are 10mm smaller than pipe casing a inner section size.While soil layer excavates, to be applied in step (2)
On the basis of the pipe casing a in crown beam that work is completed, first stage prefabricated pile alignment procedures (2) are applied by the way of static press piling
The pipe casing a that work is completed carries out pitching pile, guarantees that the bottom absolute altitude of prefabricated pile is always maintained in soil layer digging process lower than excavation face
The position below 1m；
(5) install first of purlin and pipe casing: purlin uses prefabricated reinforced concrete purlin, section ruler be 500mm ×
500mm, purlin depth of section is equal with pipe casing b height, the preparation before purlin construction and step (2) crown beam construction phase
Together, it is first passed through using anchor pole b and wears anchor hole hole on the floor with holes of the left and right ends steel pipe casing b, and squeezed into steel in soil layer
Pipe casing b processed is fixed, and excavates out installation slot position of the purlin groove as prefabricated reinforced concrete purlin, prefabricated reinforced concrete
Purlin is connect with pipe casing b by grout sleeve, and 15 steel ties and precast reinforced coagulation should be respectively welded in the both sides pipe casing b
Fortifield village's purlin carries out sleeve grouting drawknot, and steel tie diameter is 20mm, and the length of steel tie is 1000mm.Whole purlin structure
On pipe casing position should with step (2) in construction complete crown beam structure on the position pipe casing a it is corresponding, strict control miss
Poor range, it is ensured that the accuracy and flexibility of subsequent prefabricated pile pitching pile；Meanwhile after purlin and pipe casing b construct, base is utilized
Soil can carry out construction second cross-brace as support according to design requirement；
(6) install press strip with holes: press strip with holes is made of steel plate, with a thickness of 12mm, width 100mm, on press strip with holes
Hole than design anchor pole sectional dimension it is 2mm big, according to the position of subsequent anchor bolt construction, spacing, by the way of machine drilling
It stays on the steel plate and sets out anchor pole location hole, the press strip with holes is connected by screw bolts on the prefabricated pile that step (4) construction is completed；
(7) it anchor bolt construction: is drilled according to the determining anchor pole hole location of design, aperture, length, gradient, is drilled into design
After depth, using pressure wind flushing hole, anchor pole c and Grouting Pipe are inserted by the anchor pole location hole on press strip with holes in step (6),
Slip casting, maintenance, tensioning and sealing off and covering anchorage is carried out to work；
(8) spray first of concrete topping: gunite concrete cement is ordinary portland cement, and coarse aggregate is cobble,
Coarse aggregate cobble-stone diameter is 10mm, and fine aggregate is medium-fine sand, and fine aggregate cobble-stone diameter is 3mm；
(9) second segment preformed pile connecting, pitching pile: second segment prefabricated pile and the first stage of step (4) construction completion is pre-
Stake processed is through row pile extension, before carrying out pitching pile again after preformed pile connecting, need to first loosen the press strip with holes that step (6) construction is completed, really
Pitching pile, pile sinking can be continued by protecting prefabricated pile, and using being welded to connect, throat depth is less than between prefabricated pile and pipe casing preformed pile connecting
Maximum interspace, in work progress, the bolt connection of press strip and prefabricated pile with holes can be controlled first 40% or so of sum, to
After whole soil layers excavate, complete all to be bolted work in time；
(10) above step (5)-step (8) are repeated, until completing the construction of building enclosure.
Above-described embodiment is presently preferred embodiments of the present invention, is not a limitation on the technical scheme of the present invention, as long as
Without the technical solution that creative work can be realized on the basis of the above embodiments, it is regarded as falling into the invention patent
Rights protection scope in.
Claims (5)
1. a kind of prefabricated pitching pile-anchor pole monoblock type foundation pit enclosure structure construction method, it is characterised in that: pass through step (1) place
Smooth, (2) construction crown beam and pipe casing, (3) first stage soil layer excavate, (4) first stage prefabricated pile is in place, pitching pile, (5) are applied
First of purlin of work and pipe casing, (6) installation press strip with holes, (7) anchor bolt construction, (8) injection first of concrete topping, (9)
Second stage preformed pile connecting, pitching pile, (10) repeat step (5)-step (8), until the construction of building enclosure is completed, it is specific to walk
It is rapid as follows:
(1) levelling of the land: being the several of axis vertical take-off by field division according to the measurement control point of construction area and physical relief
It manually opens to the high above 300mm of crown beam top mark, then use first by the way of mechanically or manually by site elevation is smooth in plot
The mode of digging is dug to Guan Liangdibiaogaochu, and crown beam groove is formed, and the crown beam ditch groove width is 150- more roomy than the crown beam of design
200mm, to reserve installment work face appropriate；
(2) construction crown beam and pipe casing: firstly, passing through wearing on the floor with holes of the left and right ends steel pipe casing a using anchor pole a
Anchor hole hole, and squeeze into soil layer and fix steel pipe casing a；Then, using the crown beam groove that step (1) construction is completed as crown beam
Interior side form and bed die, outer side mold use combined steel formwork or plywood form, crown beam steel reinforcement cage is hung, concreting finishes
Afterwards, outer side mold is removed in maintenance in time, and 8-15 root steel tie a should be respectively welded in the both sides steel pipe casing a and crown beam carries out
Drawknot is segmented drawknot, is segmented casting concrete, until whole constructions of crown beam are completed, meanwhile, crown beam and pile protection pipe construction finish
Afterwards, using base soil as support, first of cross-brace of construction is carried out according to design requirement；
(3) first stage soil layer excavates: determining the actual distribution situation of soil layer in foundation pit, suitable excavation is determined in advance in each soil layer
Scheme excavates principle according to layer and section, and every layer of cutting depth is 400mm-500mm；
(4) first stage prefabricated pile is in place, pitching pile: while soil layer excavates, with the stake in construction is completed in step (2) crown beam
On the basis of casing a, by the way of static press piling by first stage prefabricated pile alignment procedures (2) construction complete pipe casing a into
Row pitching pile, the bottom absolute altitude of first stage prefabricated pile are always maintained at lower than the position below excavation face 1m in soil layer digging process；
(5) install first of purlin and pipe casing: the preparation before purlin construction is identical as step (2) crown beam construction, first adopts
It is passed through with anchor pole b and wears anchor hole hole on the floor with holes of the left and right ends steel pipe casing b, and squeezed into steel pipe casing in soil layer
B is fixed, and excavates out purlin groove, and 8-15 root steel tie b and reinforced concrete fortifield village should be respectively welded in the both sides the pipe casing b
Purlin carries out drawknot, is segmented drawknot, is segmented casting concrete, until the installation of purlin is completed, meanwhile, purlin and pipe casing are applied
After work, using base soil as support, construction second cross-brace is carried out according to design requirement；
(6) install press strip with holes: press strip with holes is made of steel plate, according to the position of subsequent anchor bolt construction, spacing, using machinery
The mode of drilling is stayed on the steel plate sets out anchor pole location hole, and the press strip with holes is connected by screw bolts to construct in step (4) and complete
Prefabricated pile on；
(7) anchor bolt construction: drilling according to the determining anchor pole hole location of design, aperture, length, gradient, drilling to completion
Afterwards, using pressure wind flushing hole, anchor pole c and Grouting Pipe is inserted by the anchor pole location hole on press strip with holes in step (6), carried out
Slip casting, maintenance, tensioning and sealing off and covering anchorage work；
(8) spray first of concrete topping: gunite concrete cement is portland cement, and coarse aggregate is rubble, cobble or two
The mixture of person, the coarse aggregate cobble-stone diameter are 5-10mm, and fine aggregate is medium-fine sand, and the fine aggregate partial size is 2-3mm；
(9) second segment preformed pile connecting, pitching pile: the first stage prefabricated pile that second segment prefabricated pile and step (4) construction are completed
Through row pile extension, before carrying out pitching pile again after preformed pile connecting, the press strip with holes that step (6) construction is completed need to be first loosened, it is ensured that pre-
Stake processed can continue pitching pile, pile sinking, and for preformed pile connecting using being welded to connect, throat depth is less than the maximum between prefabricated pile and pipe casing
Gap, in work progress, the bolt connection of press strip and prefabricated pile with holes first controls the 30-40% or so in sum, to complete
After portion's soil layer excavates, complete all to be bolted work in time；
(10) above step (5)-step (8) are repeated, until completing the construction of building enclosure.
2. a kind of prefabricated pitching pile according to claim 1-anchor pole monoblock type foundation pit enclosure structure construction method, feature exist
In: crown beam and purlin in the step (2) and step (5) are that armored concrete, crown beam and purlin are poured in scene and pipe casing is logical
Cast in situs connection or grout sleeve connection are crossed, crown beam and purlin sectional dimension are not less than 500mm × 500mm, height and pile protection
Pipe height is equal, and pipe casing is hollow steel pipe, and wall thickness is not less than 20mm, and shape is rectangle or circle.
3. a kind of prefabricated pitching pile according to claim 1 or 2-anchor pole monoblock type foundation pit enclosure structure construction method, special
Sign is: steel tie length is 800-1000mm in the step (2) or (5), and the steel tie diameter is 12-20mm,
The steel tie should be connect with reinforcement welding inside crown beam or purlin, and the welded connecting rate is steel tie sum
70%-100%.
4. a kind of prefabricated pitching pile according to claim 1-anchor pole monoblock type foundation pit enclosure structure construction method, feature exist
In: prefabricated pile is steel-pipe pile in the step (4) and (9), and wall thickness 16-20mm, section minimum dimension is 500mm, prefabricated pile
Each side size it is 8-10mm smaller than pipe casing inner section size.
5. a kind of prefabricated pitching pile according to claim 1-anchor pole monoblock type foundation pit enclosure structure construction method, feature exist
In: press strip with holes is steel plate materials in the step (6), press strip with holes with a thickness of 12mm, width 100mm, on press strip with holes
Hole than design anchor pole sectional dimension it is 2mm big.
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|---|---|---|---|---|
| KR20130085353A (en) * | 2012-01-19 | 2013-07-29 | 백인우 | Construction method for retaining wall and construction apparatus for thereof and retaining wall structure |
| CN105544559A (en) * | 2016-01-29 | 2016-05-04 | 济南轨道交通集团有限公司 | Structure and method for foundation pit supporting by adopting prefabricated parts |
| CN106400813A (en) * | 2016-10-28 | 2017-02-15 | 北京城建勘测设计研究院有限责任公司 | Foundation pit support system and construction method thereof |
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| KR20130085353A (en) * | 2012-01-19 | 2013-07-29 | 백인우 | Construction method for retaining wall and construction apparatus for thereof and retaining wall structure |
| CN105544559A (en) * | 2016-01-29 | 2016-05-04 | 济南轨道交通集团有限公司 | Structure and method for foundation pit supporting by adopting prefabricated parts |
| CN106400813A (en) * | 2016-10-28 | 2017-02-15 | 北京城建勘测设计研究院有限责任公司 | Foundation pit support system and construction method thereof |
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