CN110284723A - A kind of composite structure and its construction method in existing pile periphery set hollow pile - Google Patents
A kind of composite structure and its construction method in existing pile periphery set hollow pile Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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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
A kind of composite structure and its construction method in existing pile periphery set hollow pile of the present invention, it is related to reinforcing the technical field of pile foundation under existing building, is designed for the engineering demand for carrying out underground space development and existing pile foundation reinforcing under the building of soft clay area existing pile basis.The composite structure of the existing pile periphery set hollow pile includes existing pile body and the hollow pile for enclosing set, wherein hollow pile contains multiple pile cutofves, each pile cutoff is assemblied by the prefabricated arc-shaped pile piece of one third circumference, multiple annular pile cutofves are spliced into assembled combined hollow stake along central axis direction, and are gradually pressed into the soil body using static pressure.All after the completion of indentation, in grouting and reinforcing hollow pile and its soil body between existing pile.The composite structure makes existing pile body, peripheral hollow pile and top cushion cap form overall structure, has good common bearing capacity, improves the bearing capacity of existing pile foundation, provides technical support for the exploitation of existing building down space.
Description
Technical field
The present invention relates to piling strtucture and the correlative technology fields of construction technology, more particularly to one kind in existing pile periphery
Cover the composite structure and its construction method of hollow pile.
Background technique
Urban land use rate is improved, urban transportation blocking is solved and improves Urban population underground activities space (such as underground
Market), orderly, safety, rationally, efficiently develop the potential Underground Space Resource of modern city, be always present modern city
Development there is an urgent need to places.
There are still the underground spaces under a large amount of existing buildings not to utilize in China city now, older
Building, and these old building objects are built positioned at downtown or for history relic, and the center in many cities is caused
Commercial load is in problems such as the difficult and commercial shop front valuableness of parking.Therefore, the underground space development benefit below existing building is developed
With particularly significant.
Soft clay area mostly uses a raft or Piled-box foundaton, still lacks pile foundation when being adapted to underground space development under existing building
Plinth reinforcement technique.
Patent " static pressure pile process of construction of existing building basement " (CN200710116226.8) describes a kind of benefit
The method for adding basement with anchor jacked pile.But the arrangement and method for construction of this method is not suitable for having used the building of pile foundation originally
Structure, belongs to base displacing, high expensive and risk is larger.
Patent " a kind of method and building suitable for frame structure building underground increasing layer "
(CN201610629939.3) technique that underground increasing layer is carried out using underpinned pile is described, because newly-increased pile foundation is in original independence
Basic outside needs additionally to expand basic place, it is difficult to be suitable for building dense urban centers area.
In heavy traffic and crowded down town, the construction of underground increasing layer is carried out under building, it is either right
Traffic still can all cause a degree of influence to script building functions, so not to traffic and periphery when controlling construction
Environment impacts, or even needs to guarantee the normal use of construction time building second floor and the above floor.
Based on this, a kind of composite structure and its construction method in existing pile periphery set hollow pile, comprehensive utilization have been invented
The bearing capacity of existing pile foundation simultaneously reduces construction disturbance influence.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of combinations in existing pile periphery set hollow pile
Structure and its construction method.The combined mechanism and its construction method can be clearly understood according to explanation provided by the present invention
Concrete condition.
The technical solution adopted by the present invention is that:
A kind of composite structure in existing pile periphery set hollow pile, which is characterized in that the group of existing pile periphery set hollow pile
It closes structure to be divide into upper part and lower part, lower part is divided into the assembled hollow pile coaxially arranged in the periphery for building existing pile body, top
It is divided under the outer solid reinforced concrete pile body with hollow pile equivalent diameter poured in existing pile basis, assembled hollow pile
The depth of end face is deeper than the depth of existing pile body lower end, and mixed filled with the mortar soil body between assembled hollow pile and existing pile body
Close object.
A kind of construction method of the composite structure in existing pile periphery set hollow pile, which comprises the following steps:
(1) soil body below existing building is excavated in part, and support construction is arranged outside the boundary of works area of hollow pile；
(2) the prefabricated arc-shaped pile piece of three pieces with stake point is closed up in existing pile foundation periphery, Prefabricated hollow pile pile cutoff with it is existing
Pile body is coaxially arranged, and ring stiffener is placed in the circumferential fixed groove reserved on the outside of prefabricated pile cutoff after closing up, and annular is reinforced
Muscle head and the tail weld, and are welded and fixed with the steel plate of fixed modal circumferential stiffening rib, the casting concrete protective layer outside circumferential fixed groove；
(3) static pressure machinery is installed, on assembled hollow pile upper surface, and positioned at four apron pieces on cushion cap in assembled
The projected position of hollow pile upper surface accordingly places jack, and very heavy top/bottom part is lined with the prefabricated axially position tenon that agrees with
Steel plate, jack top are shored by I-steel, and billet is lined between I-steel and cushion cap；
(4) two slip casting hose one is placed on the inside of hollow pile, one is placed on the outside of hollow pile, by bottom end with stake point
Two slip casting hose straps are entered the soil body by hollow pile pile cutoff static pressure；
(5) when first segment hollow pile pile cutoff static pressure enters the soil body and 50 centimeters more than construction level face, stop static pressure, open
Begin assembled second segment hollow pile, and adjacent pile cutoff is staggered splicing seams docking, using connecing at the stake mouth of upper-lower section hollow pile pile cutoff
Stake, and use and be fully welded；After the completion of pile extension, continue such static pressure, and is sequentially completed the static pressure work of all hollow pile pile cutofves；
(6) slowly at the uniform velocity soft by two by entering the slip casting hose pressurization injection cement mortar of the soil body with pile cutoff static pressure
Pipe extraction, makes cement mortar be full of the soil body gap that piling generates；
(7) in the assembled welded reinforcement cage in existing pile body periphery for excavating the above dabbing of soil layer, and steel reinforcement cage and top is empty
Heart stake pile cutoff stretches out reinforcing bar and the principal rod welding of cushion cap links together, and the bar planting into existing pile body makes steel reinforcement cage and chisel
The principal stress bar splicing that existing pile body exposes after hair；Formwork pours the reality become with the isodiametric common stress of hollow pile later
Heart reinforced concrete pile body completes the composite structure in existing pile body periphery set hollow pile.
The beneficial effects of the present invention are:
(1) construction method that pile foundation carries out underground increasing layer is reinforced using adding hollow pile, it is long not needing to increase former pile foundation
Under the premise of degree, using Prefabricated hollow pile static pressure, construction area while also improving combination pile body without departing from the area of original building
Bearing capacity, can consolidate basis stability.
(2) there are soil layers between existing pile and hollow pile, and additional frictional resistance can be obtained by increasing new hollow pile.Pressurization
Influence caused by the soil body gap of the generations such as the soil compaction effect when cement mortar of perfusion is significantly reduced because of static hollow pile.
(3) the concrete prefabricated hollow pile in the present invention can be segmented indentation, not limited by existing building nitride layer is high.
(4) part is excavated, and by root application work, limits utilize the static pressure of original building, cause to traffic and surrounding enviroment
Effects on Engineering it is small, and the function of not influencing original building second floor and the above floor uses.
(5) present invention can be used for the reconstruction of existing building of urban central zone, and the underground space out newly developed is to increase
If underground parking is to alleviate the problem of city parking hardly possible, or to develop market place builet below the ground etc..
Composite structure and its construction method in existing pile periphery set hollow pile of the invention can be in development architecture lower part sky
Between when reinforcing soft soil pile foundation, can accept perpendicular using hollow pile, solid pile body and existing pile body three combining form, solid pile body
To load and part that existing pile body and hollow pile link together, allow them to become the whole of common stress and deformation
Body set up entirety can and be able to bear required intensity.The essence of hollow pile is opened under existing building in the application
Original pile body is reinforced when digging, and composite structure lower part load is by existing pile body, inter-pile soil, hollow pile three parts shared, lotus
Carry only some act on hollow pile；And have more vertical stress reinforcing bar in prefabricated hollow pile, it can carry
Portion's load；In terms of shearing strength, oriented existing pile reinforcement planting in the solid cylinder of top guarantees the common stress of composite structure, mentions
Its high shear resistance.
The application construction method need to only excavate the construction space of planes for realizing static pressure construction enough, do not need to backfill, be
Static pressure enters soil layer, then grout filling soil mass crack, avoids and impacts to original building and ambient enviroment.
The application composite structure is greater than the building that existing pile body hollow pile is reinforced using diameter, and existing pile body stake diameter is generally small
In 800mm, it is Small Diameter Pile or intermediate diameter stake, knot can satisfy using joinery and its construction, modal circumferential stiffening rib, prefabricated steel welding
Structure requirement.
The present invention can be realized large area static pressure enter soil layer, low cost be able to satisfy reinforcing after the underground space there are also commercially available
Space, realize underground space increasing layer simultaneously guarantee the underground space maximize.
Detailed description of the invention
Fig. 1 is the stereoscopic schematic diagram for the composite structure in existing pile periphery set hollow pile that the construction in the present invention is completed.
Fig. 2 is the stereoscopic schematic diagram of the stake piece on the hollow pile pile cutoff of bottom end with stake point.
Fig. 3 is the stake piece stereoscopic schematic diagram for forming several plain hollow stake pile cutofves of middle section,
Fig. 4 is the stake piece stereoscopic schematic diagram for forming the hollow pile pile cutoff that top has reinforcing bar to stretch out.
Fig. 5 is the process schematic that hollow pile pile cutoff is assemblied to form in work progress.
Fig. 6 is the enlarged drawing of instruction I in Fig. 5.
Fig. 7 is static hollow pile pile cutoff and to pour solid reinforced concrete pile body in vitro in existing pile in work progress
Planarization process schematic diagram.
Fig. 8 is the floor map of Section A-A in Fig. 7,
Fig. 9 is the floor map of section B-B in Fig. 7.
In figure, 1 be existing pile body, 2 be assembled hollow pile, 3 be pile body cushion cap, 4 be solid reinforced concrete pile body, 21
It is pile cutoff for stake piece, 22,23 be ring stiffener, the steel plate of 24 fixed modal circumferential stiffening ribs；The 25 filling soil bodys；
2-1 is circumferential positioning tenon and axially position tenon simultaneously, and 2-2 is axially position groove, and 2-3 is that circumferential positioning is recessed
Slot, 2-4 are circumferential fixed groove, and 2-5 is pre-buried mild steel steel plate, and 2-6 is pile top, and the top 2-7 hollow pile pile cutoff stretches out steel
Muscle, 2-8 are Prefabricated hollow pile stake piece splicing seams；
4-1 is billet, and 4-2 is I-steel, and 4-3 is jack, and 4-4 is the steel for agreeing with axially position tenon of customization
Plate, 4-5 are slip casting hose, and 4-6 is the existing pile body of dabbing.
Specific embodiment
With reference to the accompanying drawings and examples, a specific embodiment of the invention is described in further detail, is needed
What is illustrated is all equivalent transformations made on the basis of the technical solutions of the present application the invention is not limited in following specific embodiments
Each fall within protection scope of the present invention.
As shown in Figure 1, the invention discloses a kind of composite structures and its construction method in existing pile periphery set hollow pile
Invention design.In existing pile periphery, the composite structure of set hollow pile is divide into upper part and lower part, and lower part is divided into building existing pile
The coaxially arranged assembled hollow pile 2 in periphery of body 1, top be divided into existing pile basis it is outer pour it is same with assembled hollow pile
Isodiametric solid reinforced concrete pile body 4, the depth of the lower end surface of assembled hollow pile are deeper than the depth of existing pile body lower end,
And mortar soil body mixture is filled between assembled hollow pile and existing pile body.Pile body cushion cap is fixed on existing pile body top
3, this is part existing for existing pile body itself, and the surrounding side of pile body cushion cap has been evenly arranged apron piece.
The assembled hollow pile is made of several hollow pile pile cutofves 22, and each hollow pile pile cutoff is in annulus column, by three
A identical arc-shaped pile piece 21 is spliced to form, stitching portion formed splicing seams, adjacent pile cutoff be staggered splicing seams docking.The application preferably by
Three arc-like sheet assembly forms meet three tablets rule, more stability, and if the prefabricated pile sector-meeting using two panels semicircle is deposited
In a shearing resistance weakness direction, this direction only there are two tenon and periphery ring stiffener can shearing resistance, two tenons easily quilt
It cuts up；Pile cutoff is formed if it is the prefabricated pile piece of four quadrants, then there can be two shearing resistance weakness directions, similarly easily
Damage, loses geometric invariance.Every Prefabricated hollow pile stake piece splicing seams 2-8 should be in two splicing seams of adjacent pile cutoff dividing
Position.
Assembled hollow pile by the hollow pile pile cutoff of bottom end with stake point, top have reinforcing bar stretch out hollow pile pile cutoff and in
Between part several plain hollow pile cutofves constitute.
As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, each hollow pile pile cutoff is closed by the prefabricated arc-shaped pile piece of nearly one third circumference
Hold together composition.Assembled hollow pile include the hollow pile pile cutoff that the hollow pile pile cutoff of bottom end with stake point, top have reinforcing bar to stretch out and
Several plain hollow pile cutofves of middle section.Ring stiffener is placed in the circumferential groove reserved on the outside of prefabricated pile cutoff after closing up
It is welded and fixed with the steel plate 24 of fixed modal circumferential stiffening rib, and is welded to connect after-pouring concrete cover in reinforcing rib head and the tail.Phase
Adjacent pile cutoff is staggered splicing seams docking, and every Prefabricated hollow pile stake piece splicing seams 2-8 should be at adjacent two on adjacent pile cutoff
The middle quartile of splicing seams is set.
Hollow pile pile cutoff, which is closed up by three identical arc-shaped pile pieces 21 using prefabricated joinery and its construction, to be formed.Middle section hollow pile
The structure of the prefabricated pile piece of pile cutoff as shown in figure 3, stake piece up and down, left and right end face is equipped with and positions tenon and axis simultaneously to be circumferential
To positioning tenon 2-1, circumferential positioning groove 2-3, axially position groove 2-2, wherein circumferential positioning tenon and circumferential positioning groove
It is arranged on circumferential end face, axially position tenon and axially position groove 2-2 are arranged on axial end face, the axial direction of a pile cutoff
The axially position groove 2-2 for positioning tenon and adjacent pile cutoff is spliced by joinery and its construction, and two stake pieces on the same pile cutoff are logical
Circumferential positioning tenon is crossed to splice with corresponding circumferential direction positioning groove 2-3；It is along the circumferential direction equipped on the lateral surface of each piece
Twice circumferential direction fixed groove 2-4, twice circumferential direction fixed groove 2-4 are placed equidistant on the lateral surface of stake piece.Circumferential fixed groove
It is placed in the ring stiffener 23 being welded and fixed in 2-4, there are the steel plate 24 of fixed modal circumferential stiffening rib in circumferential fixed groove 2-4,
And thering is the plain concrete protective layer poured to cover circumferential fixed groove, there are pre-buried mild steel steel for the upper and lower ends of each piece
Plate 2-5.The steel plate 24 of modal circumferential stiffening rib is fixed in circumferential fixed groove by welding, the steel plate 24 of fixed modal circumferential stiffening rib
Both ends are weldingly fixed on the stress reinforcing bar in Prefabricated hollow pile stake piece main body.
The structure of the prefabricated pile piece of the hollow pile pile cutoff of bottom end with stake point as shown in Fig. 2, prefabricated pile piece on the pile cutoff with
Stake piece on intermediate pile cutoff is compared, and the axially position groove 2-3 of bottom is lacked, and the upper surface of this piece is axially position tenon,
Cooperate with the axially position groove of a upper pile cutoff and splice, circumferential positioning groove 2-3, circumferential positioning are respectively set on the end face of left and right
Tenon, two stake pieces are spliced by the circumferential tenon that positions with corresponding circumferential direction positioning groove 2-3, and the lower end surface welding of this piece is pre-
The mild steel steel plate 2-5 buried, and pile top 2-6 is welded on the lower surface of pre-buried mild steel steel plate.
The prefabricated pile chip architecture for the hollow pile pile cutoff that top has reinforcing bar to stretch out is as shown in figure 4, the prefabricated pile piece and interlude
The stake piece of use is compared, and lacks the axially position tenon at top, the upper surface of the prefabricated pile piece of the hollow pile pile cutoff on top is equipped with
Top hollow pile pile cutoff stretches out reinforcing bar 2-7 for welding.
A kind of construction method of composite structure in existing pile periphery set hollow pile is described below.
The soil body below existing building is excavated in part, and support construction is arranged outside the boundary of works area of hollow pile, excavates position
Horizontal plane be construction level face.
The prefabricated arc-shaped pile piece of three pieces bottom end with stake point is closed up in existing pile foundation periphery, Prefabricated hollow pile pile cutoff with it is existing
Pile body is coaxially arranged, and ring stiffener is placed in the circumferential fixed groove reserved on the outside of prefabricated pile cutoff after closing up, and annular is reinforced
Muscle head and the tail weld, and are welded and fixed with the steel plate 24 of fixed modal circumferential stiffening rib, and casting concrete is protected outside circumferential fixed groove
Layer.
Static pressure machinery is installed, on assembled hollow pile upper surface, and it is empty in assembled to be located at four apron pieces on cushion cap
The projected position of heart stake upper surface accordingly places jack 4-3, and very heavy top/bottom part be lined with customization agree with axially position tenon
Steel plate 4-4, jack top shored by I-steel 4-2, the slightly larger billet 4-1 of area is lined between I-steel and cushion cap,
The area of billet and the area equation of cushion cap lower surface.
Two slip casting hose 4-5 mono- are placed on the inside of hollow pile, one is placed on the outside of hollow pile (since soil compaction effect is heavy
The soil structures of pile body surrounding are disturbed when stake, that is, the soil body of hollow pile two sides (inner side and outer side) will receive disturbance,
Between hollow pile and the stake of the existing pile and periphery of the composite structure in other words), by the hollow pile pile cutoff static pressure of bottom end with stake point
Two slip casting hose straps are entered into the soil body.
When first segment hollow pile pile cutoff static pressure enters the soil body and 50 centimeters more than construction level face, stop static pressure, starts
Assembled second segment hollow pile pile cutoff, adjacent pile cutoff are staggered splicing seams docking, and the splicing seams being staggered should ensure that its spacing is maximum and phase
Deng using Jointing at the stake mouth of upper-lower section hollow pile pile cutoff, and using being fully welded.After the completion of pile extension, continuation so (refers to and takes
Identical mode would pick up the hollow pile static pressure that comes to 50 centimeters of distance construction horizontal plane) static pressure, and be sequentially completed all hollow
The static pressure work of stake pile cutoff.
Slip casting hose by entering the soil body with pile cutoff static pressure, which pressurizes, injects cement mortar, slowly at the uniform velocity takes out two hoses
Out, cement mortar is made to be full of the soil body gap that piling generates.
In the assembled welded reinforcement cage in the periphery existing pile body 4-6 for excavating the dabbing of soil layer or more, and by the upper end of steel reinforcement cage
It is welded with the cushion cap principal rod of 3 lower surface dabbing of cushion cap, the hollow pile pile cutoff that the lower end and top of steel reinforcement cage have reinforcing bar to stretch out
Top hollow pile pile cutoff stretch out reinforcing bar 2-7 welding links together, the bar planting into existing pile body, make steel reinforcement cage with it is existing after dabbing
The principal stress bar splicing that pile body exposes.Formwork, which pours, later becomes solid with the isodiametric common stress of assembled hollow pile
Reinforced concrete pile body 4 completes the composite structure in existing pile body periphery set hollow pile.
The present invention is directed to carries out underground space development and existing pile foundation reinforcing under the building of soft clay area existing pile basis
Engineering demand and design, including existing pile and the hollow pile for enclosing set, wherein hollow pile contains multiple pile cutofves, and each pile cutoff is by three points
One of the prefabricated arc-shaped pile piece of circumference assembly, multiple annular pile cutofves are spliced into assembled combined hollow along central axis direction
Stake, and the soil body is gradually pressed into using static pressure.All after the completion of indentation, in grouting and reinforcing hollow pile and its soil body between existing pile.
The composite structure makes existing pile body, peripheral hollow pile and top cushion cap form overall structure, has common carrying energy well
Power improves the bearing capacity of existing pile foundation, provides technical support for the exploitation of existing building down space.
The preferred embodiment of the present invention has been described above in detail, but the tool that present invention is not limited to the embodiments described above
Body details can carry out a variety of equivalents, these etc. to technical solution of the present invention within the scope of the technical concept of the present invention
It is all belonged to the scope of protection of the present invention with transformation.
Claims (10)
1. a kind of composite structure in existing pile periphery set hollow pile, which is characterized in that the combination of existing pile periphery set hollow pile
Structure is divide into upper part and lower part, and lower part is divided into the assembled hollow pile coaxially arranged in the periphery for building existing pile body, upper part
For in the outer solid reinforced concrete pile body with hollow pile equivalent diameter poured in existing pile basis, the lower end of assembled hollow pile
The depth in face is deeper than the depth of existing pile body lower end, and mixes between assembled hollow pile and existing pile body filled with the mortar soil body
Object.
2. a kind of composite structure in existing pile periphery set hollow pile according to claim 1, which is characterized in that the sky
Heart stake is made of several pile cutofves, and each hollow pile pile cutoff is in annulus column, is spliced to form by three identical arc-shaped pile pieces, stitching portion
Formed splicing seams, adjacent pile cutoff be staggered splicing seams docking.
3. a kind of composite structure in existing pile periphery set hollow pile according to claim 2, which is characterized in that every pre-
The middle quartile that hollow pile stake piece splicing seams processed are in two splicing seams of adjacent pile cutoff is set.
4. a kind of composite structure in existing pile periphery set hollow pile according to claim 1, which is characterized in that pile cutoff point
Several plain hollows of the hollow pile pile cutoff and middle section that there is reinforcing bar to stretch out for the hollow pile pile cutoff of bottom end with stake point, top
Pile cutoff.
5. a kind of composite structure in existing pile periphery set hollow pile according to claim 4, which is characterized in that Mei Gezhuan
Duan Yousan identical arc-shaped pile pieces close up composition using prefabricated joinery and its construction, and set in circumferential fixed groove reserved on the outside of pile cutoff
Enter the ring stiffener being welded and fixed, there are the steel plates of fixed modal circumferential stiffening rib in circumferential fixed groove, and have the element poured mixed
Solidifying protective soil layer covers circumferential fixed groove, and there are pre-buried mild steel steel plates for the upper and lower ends of every section pile cutoff.
6. a kind of composite structure in existing pile periphery set hollow pile according to claim 5, which is characterized in that middle part
The prefabricated pile piece of point plain hollow stake pile cutoff up and down, left and right end face is equipped with and positions tenon and axially position is convex to be circumferential simultaneously
Tenon, circumferential positioning groove, axially position groove, wherein circumferential positioning tenon and circumferential positioning groove are arranged on circumferential end face,
Axially position tenon and axially position groove are arranged on axial end face, axially position tenon and the adjacent pile cutoff of a pile cutoff
Axially position groove is spliced by joinery and its construction, and two stake pieces on the same pile cutoff position tenon and corresponding ring by circumferential
Splice to positioning groove；Twice circumferential direction fixed groove is along the circumferential direction equipped on the lateral surface of each piece, twice circumferential direction is solid
Determine groove to be placed equidistant on the lateral surface of stake piece.
7. a kind of composite structure in existing pile periphery set hollow pile according to claim 5, which is characterized in that circumferential direction is solid
Determine the steel plate for fixing modal circumferential stiffening rib in groove by welding, the both ends of the steel plate of fixed modal circumferential stiffening rib be fixed on it is prefabricated
Stress reinforcement welding in hollow pile stake piece main body is together.
8. a kind of composite structure in existing pile periphery set hollow pile according to claim 5, which is characterized in that bottom end band
For the prefabricated pile piece that the hollow pile pile cutoff of pile top uses compared with the stake piece of plain hollow stake pile cutoff, the axially position for lacking bottom is recessed
Slot is welded with pile top on the lower surface of the pre-buried mild steel steel plate in bottom end.
9. a kind of composite structure in existing pile periphery set hollow pile according to claim 5, which is characterized in that top has
For the prefabricated pile piece that the hollow pile pile cutoff that reinforcing bar stretches out uses compared with the stake piece of plain hollow stake pile cutoff, the axial direction for lacking top is fixed
Position tenon, and reinforcing bar is stretched out in the upper surface of the pre-buried mild steel steel plate in top welding top hollow pile pile cutoff.
10. a kind of construction method of the composite structure in existing pile periphery set hollow pile, which comprises the following steps:
(1) soil body below existing building is excavated in part, and support construction is arranged outside the boundary of works area of hollow pile；
(2) the prefabricated arc-shaped pile piece of three pieces with stake point is closed up in existing pile foundation periphery, Prefabricated hollow pile pile cutoff and existing pile body
It is coaxially arranged, ring stiffener is placed in the circumferential fixed groove reserved on the outside of prefabricated pile cutoff after closing up, ring stiffener is first
Tail welding, and be welded and fixed with the steel plate of fixed modal circumferential stiffening rib, the casting concrete protective layer outside circumferential fixed groove；
(3) static pressure machinery is installed, on assembled hollow pile upper surface, and it is hollow in assembled to be located at four apron pieces on cushion cap
The projected position of stake upper surface accordingly places jack, and very heavy top/bottom part is lined with the prefabricated steel for agreeing with axially position tenon
Plate, jack top are shored by I-steel, and billet is lined between I-steel and cushion cap；
(4) two slip casting hose one is placed on the inside of hollow pile, one is placed on the outside of hollow pile, by the hollow of bottom end with stake point
Two slip casting hose straps are entered the soil body by stake pile cutoff static pressure；
(5) when first segment hollow pile pile cutoff static pressure enters the soil body and 50 centimeters more than construction level face, stop static pressure, start to spell
Filling second segment hollow pile, adjacent pile cutoff is staggered splicing seams docking, Jointing is used at the stake mouth of upper-lower section hollow pile pile cutoff, and
Using being fully welded；After the completion of pile extension, continue such static pressure, and is sequentially completed the static pressure work of all hollow pile pile cutofves；
(6) by entering the slip casting hose pressurization injection cement mortar of the soil body with pile cutoff static pressure, slowly at the uniform velocity two hoses are taken out
Out, cement mortar is made to be full of the soil body gap that piling generates；
(7) in the assembled welded reinforcement cage in existing pile body periphery for excavating the above dabbing of soil layer, and by steel reinforcement cage and top hollow pile
Pile cutoff stretches out reinforcing bar and the principal rod welding of cushion cap links together, the bar planting into existing pile body, after making steel reinforcement cage and dabbing
The principal stress bar splicing that existing pile body exposes；Formwork pours the single solid steel become with the isodiametric common stress of hollow pile later
Reinforced concrete pile body completes the composite structure in existing pile body periphery set hollow pile.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111945711A (en) * | 2020-08-05 | 2020-11-17 | 武汉正远岩土科技有限公司 | High-bearing large-diameter assembly type composite engineering pile and construction method thereof |
| CN112523200A (en) * | 2020-12-18 | 2021-03-19 | 郑州大学综合设计研究院有限公司 | Integrated tubular pile |
| CN113373912A (en) * | 2021-06-22 | 2021-09-10 | 上海市机械施工集团有限公司 | Construction method for grouting pile bottom of steel pipe pile |
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