CN109778841A - Recoverable presstressed reinforcing steel bored concrete pile and its construction method for foundation pit enclosure - Google Patents
Recoverable presstressed reinforcing steel bored concrete pile and its construction method for foundation pit enclosure Download PDFInfo
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- CN109778841A CN109778841A CN201811477430.7A CN201811477430A CN109778841A CN 109778841 A CN109778841 A CN 109778841A CN 201811477430 A CN201811477430 A CN 201811477430A CN 109778841 A CN109778841 A CN 109778841A
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Abstract
The present invention relates to a kind of recoverable presstressed reinforcing steel bored concrete piles and its construction method for foundation pit enclosure, the bored concrete pile includes U-shaped integrated end component, vertical main reinforcement and tension ground tackle, vertical main reinforcement includes vertical reinforcing bar and presstressed reinforcing steel, the upper end of vertical reinforcing bar is fixed in the tension ground tackle, and lower end is fixed in the U-shaped integrated end component；The presstressed reinforcing steel is U-shaped, and bottom is limited in the U-shaped integrated end component, and both ends are pierced by out of described tension ground tackle, and the every presstressed reinforcing steel is symmetrical about the central axes of the bored concrete pile；The presstressed reinforcing steel includes steel strand wires and the sheath that is coated on the outside of the steel strand wires.In the present invention, vertical main reinforcement by the common vertical reinforcing bar of presstressed reinforcing steel substitution a part as bored concrete pile, presstressed reinforcing steel passes through the U-shaped integrated end component of lower end and the tension ground tackle of upper end, carry out anchoring lower ends and upper end tensioning, after base pit engineering, pull one end realizes the quick recycling of steel strand wires.
Description
Technical field
The present invention relates to foundation pit enclosure design and construction field more particularly to a kind of recoverable for foundation pit enclosure are pre-
Stress rib bored concrete pile and its construction method.
Background technique
In Foundation Pit Support Engineering, frequently with bored concrete pile as periphery building enclosure, bear caused by Unloading
Water And Earth Pressures.A kind of interim barrier wall structure of the bored concrete pile as foundation pit no longer needs to play and make after underground engineering construction
With, and the conventional bored concrete pile used in engineering at present, steel reinforcement cage are all made into using regular reinforcement, rolled steel dosage greatly, cost
Height, and reinforcing bar becomes the permanent waste in underground after engineering, causes the very big wasting of resources, does not meet China's construction
The theory policy of " resource-conserving, environmentally friendly " society.
Therefore, how a kind of good economy performance, environmentally protective, sustainable development the recoverable for foundation pit enclosure are provided
Presstressed reinforcing steel bored concrete pile and its construction method are those skilled in the art's technical problems urgently to be resolved.
Summary of the invention
The present invention provides a kind of recoverable presstressed reinforcing steel bored concrete pile and its construction method for foundation pit enclosure, to solve
Above-mentioned technical problem.
In order to solve the above technical problems, the present invention provides a kind of recoverable presstressed reinforcing steel perfusion for foundation pit enclosure
Stake, including U-shaped integrated end component, vertical main reinforcement and tension ground tackle, wherein the vertical main reinforcement include vertical reinforcing bar and
The upper end of presstressed reinforcing steel, the vertical reinforcing bar is fixed in the tension ground tackle, and the U-shaped integrated end structure is fixed in lower end
In part；The presstressed reinforcing steel is U-shaped, and bottom is limited in the U-shaped integrated end component, and both ends are out of described tension ground tackle
It is pierced by, the every presstressed reinforcing steel is symmetrical about the central axes of the bored concrete pile；The presstressed reinforcing steel include steel strand wires and
The sheath being coated on the outside of the steel strand wires.
Preferably, the sheath selects flexiplast, and section is ripple hollow tubular, the steel strand wires and the sheath
Between be coated with anti-corrosion lubricant.
Preferably, the diameter of the steel strand wires is 9.53mm~17.8mm；The internal diameter of the sheath is than the steel strand wires
Big 3mm~the 6mm of diameter, the wall thickness of the sheath are 1.5~3.0mm.
Preferably, the arc that the U-shaped integrated end component includes top ring flat-plate, middle part ring flat-plate and bottom detours
Plate, the top ring flat-plate and middle part ring flat-plate are equipped with several the first holes passed through for the vertical main reinforcement, first hole
It is uniform, symmetrical on the top ring flat-plate and middle part ring flat-plate；The U-shaped bottom of the presstressed reinforcing steel and the arc are around andante
Fitting.
Preferably, be connected between the top ring flat-plate and the middle part ring flat-plate by hollow cylindrical ring stand, the ring stand
Limition orientation slot is equipped at position corresponding with the presstressed reinforcing steel on andante with the arc.
Preferably, the arc is equipped with several through-holes around andante.
Preferably, the tension ground tackle includes anchor ring, spiral bar and necking gasket ring, the necking gasket ring is equipped with several
For the second hole that the vertical main reinforcement passes through, second hole is uniform, symmetrical on the necking gasket ring；The spiral shell
The lower end of rotation muscle is fixed on the necking gasket ring, and helically formula is upward, and the upper end of the spiral bar is not higher than the anchor ring
Bottom；Intermediate plate is equipped in the anchor ring, the presstressed reinforcing steel passes through the intermediate plate and is pierced by out of described anchor ring.
The present invention also provides a kind of applying for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as described above
Work method, steps are as follows:
S10: steel reinforcement cage binding: the lower end of the vertical reinforcing bar passes through the U-shaped integrated end component, and upper end passes through institute
State tension ground tackle；The presstressed reinforcing steel is passed through and is detoured from the U-shaped integrated end component, and both ends are from the tensioning anchor
It is pierced by tool；
S20: reinforcing bar cage hoisting；
S30: tension of prestressed tendon: right at the top of the capping beam after the completion of bored concrete pile pile body and capping beam pour maintenance
The presstressed reinforcing steel carries out tensioning；
S40: it steel strand wires recycling and detection: disanchors at the top of the capping beam to the steel strand wires of the presstressed reinforcing steel
Afterwards, using piece steel strand wires of drawbench pull, then the steel strand wires of same root are along the U-shaped integrated end component by pull
And go out, complete the recycling of the steel strand wires.
Preferably, the control stress for prestressing of the presstressed reinforcing steel takes 0.5~0.8 times of steel strand wires strength criterion in step S30
Value, tensioning uses stress control method, and checks the stretch value of the presstressed reinforcing steel under maximum stretching force.
Preferably, tensioning process is successively are as follows: install jack, symmetrically arranged same root institute in the bored concrete pile cross section
State presstressed reinforcing steel synchronous tension, stretching force 15%, stretching force 30%, stretching force 100%, stretching force 103% holds lotus 2min anchor
Gu carrying out next Shu Zhangla after check and correction stretch value is qualified, tensioning operation is completed.
Compared with prior art, it provided by the present invention for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure and its applies
Work method has the advantages that
1. vertical main reinforcement of the present invention by the common vertical reinforcing bar of presstressed reinforcing steel substitution a part as bored concrete pile, prestressing force
Muscle carries out anchoring lower ends and upper end tensioning, foundation pit work by the U-shaped integrated end component of lower end and the tension ground tackle of upper end
After journey, pull one end realizes the quick recycling of steel strand wires, and the stress for both having improved bored concrete pile as building enclosure is special
Property, and saved the dosage of common vertical reinforcing bar, realized the recycling of some materials, have section material, energy-saving and environmental protection and
The advantages of good economy performance, can produce good economic and social benefit, provide weight for the Sustainable Exploitation of urban underground space
Want technical support；
2. as the bored concrete pile of foundation pit enclosure structure, main mechanical characteristic is by curved, and steel strand wires resist after tensioning
Tensile strength may be up to 4~5 times of regular reinforcement, in addition, also correspondingly mixing to bored concrete pile when carrying out tensioning to presstressed reinforcing steel
Solidifying soil has carried out squeezing compacting, improves the internal compressive stress of concrete, therefore, the perfusion of a part is replaced using presstressed reinforcing steel
The vertical main reinforcement of stake has beneficial to help the raising of bored concrete pile overall performance；
3. in the present invention, U-shaped integrated end component plays the role of pressure-bearing bracket in tensioning, and can make symmetrical same
A piece presstressed reinforcing steel synchronous tension, tension of prestressed tendon convenience, uniform force have construction efficiency height, and low noise, environment influence
The characteristics of small and equipment takes up little area meets the construction theory of green construction and civilized construction.
Detailed description of the invention
Fig. 1 is the vertical of the recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure of a specific embodiment mode of the invention
To cross-sectional view；
Fig. 2 is U in the recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure of a specific embodiment mode of the invention
The schematic perspective view of shape integrated end component；
Fig. 3 is U in the recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure of a specific embodiment mode of the invention
The bottom view of shape integrated end component；
Fig. 4 is the cross of the recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure of a specific embodiment mode of the invention
To cross-sectional view；
Fig. 5 contracts in the recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure for a specific embodiment mode of the invention
The transverse sectional view of mouth gasket ring；
Fig. 6 is anchor in the recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure of a specific embodiment mode of the invention
The transverse sectional view of ring.
In figure: 10-U shape integrated end component, the top 11- ring flat-plate, the middle part 12- ring flat-plate, 13- arc are around andante, 14- ring
Frame, 15- limition orientation slot；The vertical main reinforcement of 20-, the vertical reinforcing bar of 21-, 22- steel strand wires, 23- sheath；30- tension ground tackle, 31- anchor
Ring, 32- spiral bar, 33- necking gasket ring, 34- intermediate plate；41- bored concrete pile pile body, 42- capping beam.
Specific embodiment
In order to more state the technical solution of foregoing invention in detail, being exemplified below specific embodiment proves that technology is imitated
Fruit；It is emphasized that these embodiments are not limited to limit the scope of the invention for illustrating the present invention.
Provided by the present invention for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure, please refer to figs. 1 to 4, including U
Shape integrated end component 10, vertical main reinforcement 20 and tension ground tackle 30, wherein the vertical main reinforcement 20 includes vertical reinforcing bar 21
And presstressed reinforcing steel, the presstressed reinforcing steel include steel strand wires 22 and the sheath 23 for being coated on 22 outside of steel strand wires, the sheath
23 can the steel strand wires 22 to its inside can play protection, and convenient for the extraction recycling of later period steel strand wires 22；The vertical reinforcing bar 21
Upper end be fixed in the tension ground tackle 30, lower end is fixed in the U-shaped integrated end component 10；The presstressed reinforcing steel
For U-shaped, bottom is limited in the U-shaped integrated end component 10, and both ends are pierced by out of described tension ground tackle 30, described in every
Presstressed reinforcing steel is symmetrical about the central axes of the bored concrete pile.The present invention vertical steel common by presstressed reinforcing steel substitution a part
Vertical main reinforcement 20 of the muscle 21 as bored concrete pile, presstressed reinforcing steel pass through the U-shaped integrated end component 10 of lower end and of upper end
Anchorage 30 is drawn, carries out anchoring lower ends and upper end tensioning, after base pit engineering, pull one end realizes the quick of steel strand wires 22
Recycling, had not only improved mechanical characteristic of the bored concrete pile as building enclosure, but also saved rolled steel dosage, and had realized the weight of some materials
It is multiple to utilize；And steel strand wires 22 tensile strength is high, and the stress performance of bored concrete pile can be improved, have it is environmentally protective, high-efficiency low-carbon it is excellent
Point, economic and social benefit are significant.
Preferably, asking emphasis with reference to Fig. 1, the sheath 23 selects flexiplast, and section is ripple hollow tubular, can be made
Steel strand wires 22 and the compatibility of deformation of bored concrete pile are more preferable, avoid plastics cracking damage；And ripple hollow tubular can increase sheath 23
The anti-extrusion ability of itself reduces bored concrete pile inner concrete and destroys to the extruding of sheath 23；The steel strand wires 22 and the sheath
It is coated with anti-corrosion lubricant between 23, soap-free emulsion polymeization between presstressed reinforcing steel and concrete can be made, be symmetrically distributed in bored concrete pile section
Presstressed reinforcing steel is the intermediate same root presstressed reinforcing steel not turned off, and steel strand wires 22 and sheath 23 itself are all jointless whole,
It extracts out and recycles convenient for subsequent steel strand wires 22；Specifically, in the present embodiment, the diameters of the steel strand wires 22 be 9.53mm~
17.8mm；The internal diameter of the sheath 23 is 3mm~6mm bigger than the diameter of the steel strand wires 22, and the wall thickness of the sheath 23 is 1.5~
3.0mm, sheath 23 and preservative play the role of protection and corrosion-resistant to the steel strand wires 22 of its inside respectively.
Preferably, asking emphasis referring to figs. 2 and 3 and combining Fig. 1, the U-shaped integrated end component 10 includes top loop
The arc of plate 11, middle part ring flat-plate 12 and bottom is equipped with several confessions around andante 13, the top ring flat-plate 11 and middle part ring flat-plate 12
The first hole that the vertical main reinforcement 20 passes through, first hole on the top ring flat-plate 11 and middle part ring flat-plate 12 uniformly,
It is symmetrical；The U-shaped bottom of the presstressed reinforcing steel is bonded with the arc around andante 13.The U-shaped integrated end component 10
For steel strand wires 22 recycling and steel reinforcement cage lower end presstressed reinforcing steel limit, around shape be oriented to；Simultaneously in tension of prestressed tendon
Play the role of pressure-bearing anchor bracket, i.e., after steel strand wires 22 are put, pull is carried out to one end, is detoured in U-shaped integrated end structure
The other end of part 10 can be extracted along the U-shaped integrated end component 10, to realize the recycling of steel strand wires 22；
In addition, U-shaped integrated end component 10 can also play the role of limit, banding to vertical reinforcing bar 21.
Preferably, asking emphasis with reference to Fig. 3, by hollow cylinder between the top ring flat-plate 11 and the middle part ring flat-plate 12
Ring stand 14 is connected, and the ring stand 14 and the arc are equipped with limit at position corresponding with the presstressed reinforcing steel on andante 13
Guide groove 15, presstressed reinforcing steel are penetrated along limition orientation slot 15 from first hole of two ring flat-plates, by lower end arc around
Andante 13 is pierced by from the first hole of the symmetrically arranged other end.
Preferably, the arc is equipped with several through-holes (not shown) around andante 13, the arc is between andante 13
Cross-like and there are through-holes can make concrete pass through arc around andante 13 down, thus not shadow when cast-in-place pile concrete pours
Ring the concrete pouring quality of bored concrete pile lower end.
Preferably, asking emphasis with reference to Fig. 1, and Fig. 5 and Fig. 6 is combined, the tension ground tackle 30 includes anchor ring 31, spiral bar 32
And necking gasket ring 33, the necking gasket ring 33 are equipped with several the second holes passed through for the vertical main reinforcement 20, described the
Two holes are uniform, symmetrical on the necking gasket ring 33, and certainly, the size of above-mentioned first, second hole should be than vertically leading
The diameter of muscle 20 is bigger；The lower end of the spiral bar 32 is fixed on the necking gasket ring 33, and helically formula is upward, the spiral
The upper end of muscle 32 is not higher than the bottom of the anchor ring 31, and before the capping beam 42 of building enclosure pours, spiral bar 32 can play guarantor
The effect of shield, bearing presstressed reinforcing steel；And the compression strength of concrete after anchor can be improved in spiral bar 32, prevents concrete under anchor from opening
Drawing effect is lower to occur local failure；It is equipped with intermediate plate 34 in the anchor ring 31, the presstressed reinforcing steel passes through the intermediate plate 34 and from institute
It states and is pierced by anchor ring 31, the intermediate plate 34 is two-chip type, using superior alloy steel.Presstressed reinforcing steel passes through the second of necking gasket ring 33
Hole upwards gradually after necking, is pierced by from intermediate plate 34 and anchor ring 31.
Specifically, with continued reference to FIG. 1, having the bellmouth of perforation in the anchor ring 31, the steel of the presstressed reinforcing steel is twisted
The bellmouth of 22 drawing-in anchor ring 31 of line, the intermediate plate 34 are put into the bellmouth of anchor ring 31 and are arranged around the steel strand wires 22,
The surface that the intermediate plate 34 is in contact with steel strand wires 22 is equipped with sawtooth, when the intermediate plate 34 is (upward) mobile outward relative to anchor ring 31
Loosen steel strand wires 22, intermediate plate 34 stings tight steel strand wires 22 when inwardly (downward) mobile relative to anchor ring 31, is easy to implement presstressed reinforcing steel
Tensioning.
The present invention also provides a kind of applying for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as described above
Work method, steps are as follows:
S10: steel reinforcement cage binding: the lower end of the vertical reinforcing bar 21 passes through the U-shaped integrated end component 10, and upper end is worn
Cross the tension ground tackle 30；The presstressed reinforcing steel is passed through and is detoured from the U-shaped integrated end component 10, and both ends are from institute
It states and is pierced by tension ground tackle 30；
In the present embodiment, presstressed reinforcing steel pierces from the first hole of the top ring flat-plate 11 of the U-shaped integrated end component 10
Enter, the limition orientation slot 15 on the ring stand 14 of hollow cylindrical, penetrates middle part ring flat-plate 12, then along lower end arc on andante 13
Limition orientation slot 15, be symmetrically pierced by from the hole of the other end.First hole and limition orientation slot 15 are bound in steel reinforcement cage
When can play the role of fixed and limition orientation to vertical main reinforcement 20.
In the position of the high following 150mm~250mm of 41 top mark of bored concrete pile pile body or so, necking gasket ring 33, this implementation are set
In example, necking gasket ring 33 is arranged at 41 top 200mm of bored concrete pile pile body, and common vertical reinforcing bar 21 and presstressed reinforcing steel exist
Top penetrates necking gasket ring 33, wherein vertical reinforcing bar 21 maintains linear state and be higher by grout pile after necking gasket ring 33
The high 500mm of 41 top mark of body, presstressed reinforcing steel carry out necking after necking gasket ring 33 upwards, the upper end of presstressed reinforcing steel are made to penetrate pressure
The anchor ring 31 at 42 top of top beam carries out tension of prestressed tendon after the completion of pouring maintenance so as to capping beam 42, prestressing force after the completion
The top top mark of muscle is high, 300~500mm should be higher by than 42 top mark of bored concrete pile capping beam, in order to arrange tension ground tackle 30 simultaneously
Tensioning.
Steel reinforcement cage after the completion of binding includes the U-shaped integrated end component of vertical main reinforcement 20, lower part needed for bored concrete pile
10 and top necking gasket ring 33.
S20: reinforcing bar cage hoisting, the lifting of steel reinforcement cage should make special Hoisting Program, including lifting method, suspension centre are arranged, just
Degree and weight checking computations etc..Wherein, suspension centre is arranged in reinforcing rib position, and should not be arranged on presstressed reinforcing steel.In lifting liftoff 300
When~500mm, stops no less than 10 minutes, check for abnormal, if there is abnormal condition, land rectification.
S30: tension of prestressed tendon: after the completion of bored concrete pile pile body 41 and capping beam 42 pour maintenance, in the capping beam 42
Top carries out tensioning to the presstressed reinforcing steel, and when tensioning, the lower end U-shaped integrated end component 10 plays pressure-bearing anchoring support
The effect of (lower part) is fixed in the effect of frame, i.e. realization tensioned at one end (top), one end.
After the completion of upper end tension ground tackle 30 is arranged, tensioning is synchronized to the presstressed reinforcing steel on same root bored concrete pile, due to
The practical presstressed reinforcing steel being arranged symmetrically on cross section is the same root presstressed reinforcing steel anchored by lower end around shape, therefore, bored concrete pile
Interior tension of prestressed tendon stress is symmetrical, uniform.
Preferably, the control stress for prestressing of the presstressed reinforcing steel takes 0.5~0.8 times of 22 intensity scale of steel strand wires in step S30
Quasi- value, tensioning uses stress control method, and checks the stretch value of the presstressed reinforcing steel under maximum stretching force.Specific tensioning process
Successively are as follows: jack is installed, presstressed reinforcing steel synchronous tension described in symmetrically arranged same root, tensioning in the bored concrete pile cross section
Power 15%, stretching force 30%, stretching force 100%, stretching force 103% are held lotus 2min anchoring, are carried out down after check and correction stretch value is qualified
A branch of tensioning, tensioning operation are completed.
S40: the recycling of steel strand wires 22 and detection: the steel strand wires 22 of the presstressed reinforcing steel are carried out at 42 top of capping beam
After disanchoring, using drawbench pull one steel strand wires 22, then the steel strand wires 22 of same root are along the U-shaped integrated end structure
Part 10 is gone out by pull, completes the recycling of the steel strand wires 22.
After the steel strand wires 22 recycle, its performance, elongation and appearance etc. should be detected by specification regulation, and by rule
Fixed storage.Before steel strand wires 22 after the recovery are re-applied to sundry item, it should can march into the arena after detecting qualification again.Recycling
Steel strand wires 22 it is reusable after detection is qualified, to save rolled steel dosage be it is long-term non-disposable, there is good warp
Ji benefit, market application prospect are wide.
22 recoverable of steel strand wires in the present invention, realizes being used in turn for engineering material, meets " four sections, one ring
" section material " and " energy conservation " in guarantor ", and reduce the permanent waste in underground, have the characteristics that environmentally protective, low-carbon energy-saving, can be
It builds a resource-conserving society and makes favorable attributes, there is good social benefit.
In conclusion provided by the present invention for the recoverable presstressed reinforcing steel bored concrete pile and its construction party of foundation pit enclosure
Method, the bored concrete pile include U-shaped integrated end component 10, vertical main reinforcement 20 and tension ground tackle 30, wherein the vertical master
Muscle 20 includes vertical reinforcing bar 21 and presstressed reinforcing steel, and the upper end of the vertical reinforcing bar 21 is fixed in the tension ground tackle 30, lower end
It is fixed in the U-shaped integrated end component 10；The presstressed reinforcing steel is U-shaped, and bottom is limited in the U-shaped integrated end
In component 10, both ends are pierced by out of described tension ground tackle 30, central axes pair of the every presstressed reinforcing steel about the bored concrete pile
Claim distribution；The presstressed reinforcing steel includes steel strand wires 22 and the sheath 23 for being coated on 22 outside of steel strand wires.In the present invention, by pre-
Vertical main reinforcement 20 of the common vertical reinforcing bar 21 of stress rib substitution a part as bored concrete pile, the U-shaped that presstressed reinforcing steel passes through lower end
Integrated end component 10 and the tension ground tackle of upper end 30, carry out anchoring lower ends and upper end tensioning, after base pit engineering, take out
One end is drawn, realizes the quick recycling of steel strand wires 22.
Obviously, those skilled in the art can carry out various modification and variations without departing from spirit of the invention to invention
And range.If in this way, these modifications and changes of the present invention belong to the claims in the present invention and its equivalent technologies range it
Interior, then the invention is also intended to include including these modification and variations.
Claims (10)
1. a kind of recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure, it is characterised in that: including U-shaped integrated end structure
Part, vertical main reinforcement and tension ground tackle, wherein the vertical main reinforcement includes vertical reinforcing bar and presstressed reinforcing steel, the vertical reinforcing bar
Upper end be fixed in the tension ground tackle, lower end is fixed in the U-shaped integrated end component；The presstressed reinforcing steel is U
Shape, bottom are limited in the U-shaped integrated end component, and both ends are pierced by out of described tension ground tackle, the every prestressing force
Muscle is symmetrical about the central axes of the bored concrete pile；The presstressed reinforcing steel includes steel strand wires and is coated on the outside of the steel strand wires
Sheath.
2. being used for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as described in claim 1, which is characterized in that the shield
Set selects flexiplast, and section is ripple hollow tubular, and anti-corrosion lubricant is coated between the steel strand wires and the sheath.
3. being used for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as claimed in claim 1 or 2, which is characterized in that institute
The diameter for stating steel strand wires is 9.53mm~17.8mm；The internal diameter of the sheath is 3mm~6mm bigger than the diameter of the steel strand wires, institute
The wall thickness for stating sheath is 1.5~3.0mm.
4. being used for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as described in claim 1, which is characterized in that the U
Shape integrated end component includes the arc of top ring flat-plate, middle part ring flat-plate and bottom around andante, the top ring flat-plate and middle part
Ring flat-plate is equipped with several the first holes passed through for the vertical main reinforcement, and first hole is in the top ring flat-plate and middle part ring
It is uniform on plate, symmetrical；The U-shaped bottom of the presstressed reinforcing steel is bonded with the arc around andante.
5. being used for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as claimed in claim 4, which is characterized in that on described
Be connected between portion's ring flat-plate and the middle part ring flat-plate by hollow cylindrical ring stand, the ring stand and the arc on andante with institute
It states and is equipped with limition orientation slot at the corresponding position of presstressed reinforcing steel.
6. being used for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as claimed in claim 4, which is characterized in that the arc
Shape is equipped with several through-holes around andante.
7. being used for the recoverable presstressed reinforcing steel bored concrete pile of foundation pit enclosure as described in claim 1, which is characterized in that described
Drawing anchorage includes anchor ring, spiral bar and necking gasket ring, and the necking gasket ring is equipped with several to be passed through for the vertical main reinforcement
Second hole, second hole are uniform, symmetrical on the necking gasket ring；The lower end of the spiral bar is fixed on described
On necking gasket ring, helically formula is upward, and the upper end of the spiral bar is not higher than the bottom of the anchor ring；Folder is equipped in the anchor ring
Piece, the presstressed reinforcing steel pass through the intermediate plate and are pierced by out of described anchor ring.
8. a kind of recoverable presstressed reinforcing steel bored concrete pile for foundation pit enclosure as described in any one of claim 1~7
Construction method, which is characterized in that steps are as follows:
S10: steel reinforcement cage binding: the lower end of the vertical reinforcing bar passes through the U-shaped integrated end component, and upper end passes through described
Draw anchorage；The presstressed reinforcing steel is passed through and is detoured from the U-shaped integrated end component, and both ends are out of described tension ground tackle
It is pierced by；
S20: reinforcing bar cage hoisting；
S30: tension of prestressed tendon: after the completion of bored concrete pile pile body and capping beam pour maintenance, to described at the top of the capping beam
Presstressed reinforcing steel carries out tensioning；
S40: it steel strand wires recycling and detection: after disanchoring at the top of the capping beam to the steel strand wires of the presstressed reinforcing steel, adopts
With piece steel strand wires of drawbench pull, then the steel strand wires of same root are gone out along the U-shaped integrated end component by pull,
Complete the recycling of the steel strand wires.
9. construction method as claimed in claim 8, which is characterized in that in step S30, the cable tensios control of the presstressed reinforcing steel is answered
Power takes 0.5~0.8 times of steel strand wires strength standard value, and tensioning uses stress control method, and checks described pre- under maximum stretching force
The stretch value of stress rib.
10. construction method as claimed in claim 9, which is characterized in that tensioning process is successively are as follows: installation jack, the filling
Infuse presstressed reinforcing steel synchronous tension described in symmetrically arranged same root, stretching force 15%, stretching force 30%, stretching force in stake cross section
100%, stretching force 103% holds lotus 2min anchoring, next Shu Zhangla is carried out after check and correction stretch value is qualified, and tensioning operation is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811477430.7A CN109778841B (en) | 2018-12-05 | 2018-12-05 | Recyclable prestressed reinforcement cast-in-place pile for foundation pit enclosure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811477430.7A CN109778841B (en) | 2018-12-05 | 2018-12-05 | Recyclable prestressed reinforcement cast-in-place pile for foundation pit enclosure and construction method thereof |
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| Publication Number | Publication Date |
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| CN109778841A true CN109778841A (en) | 2019-05-21 |
| CN109778841B CN109778841B (en) | 2022-03-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112030948A (en) * | 2020-07-16 | 2020-12-04 | 广东华隧建设集团股份有限公司 | Construction method for linearly arranging unbonded prestress pre-tightening of underground continuous wall |
| CN114278013A (en) * | 2021-12-08 | 2022-04-05 | 索泰克(北京)岩土科技有限公司 | Steel reinforcement cage of detachable steel strand wires owner muscle and supporting construction thereof |
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| CN114278013A (en) * | 2021-12-08 | 2022-04-05 | 索泰克(北京)岩土科技有限公司 | Steel reinforcement cage of detachable steel strand wires owner muscle and supporting construction thereof |
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| CN109778841B (en) | 2022-03-15 |
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