CN109778872A - A kind of cast-in-situ bored pile deep foundation pit supporting structure and its construction method - Google Patents
A kind of cast-in-situ bored pile deep foundation pit supporting structure and its construction method Download PDFInfo
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- CN109778872A CN109778872A CN201910104750.6A CN201910104750A CN109778872A CN 109778872 A CN109778872 A CN 109778872A CN 201910104750 A CN201910104750 A CN 201910104750A CN 109778872 A CN109778872 A CN 109778872A
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Abstract
The invention discloses a kind of reduction durations, facilitate installation and the preferable cast-in-situ bored pile deep foundation pit supporting structure of supporting effect and its construction method, its key points of the technical solution are that: including cast-in-situ bored pile, cement mixing method, concrete-pile, crossbeam and base plate of foundation pit, several cast-in-situ bored piles are equipped on the outside of the base plate of foundation pit, described several cast-in-situ bored piles laterally be vertically correspondingly arranged, it encloses equipped with a circle cement mixing method cast-in-situ bored pile outer end, cast-in-situ bored pile all connecting cross beams that every two opposes in several described cast-in-situ bored piles, the two sides of the crossbeam are designed with attachment device, several described crossbeam integrated settings, the cast-in-situ bored pile is equipped with the insert port for attachment device insertion, several described concrete-piles are connected to the junction between crossbeam, the concrete-pile is mounted on base plate of foundation pit.
Description
Technical field
The present invention relates to deep foundation pit support field, more particularly to a kind of cast-in-situ bored pile deep foundation pit supporting structure
And its construction method.
Background technique
Pattern foundation pit supporting structure is the safety to guarantee Underground Construction and foundation pit surrounding environment, to foundation pit side-wall and peripheral ring
Supporting and retaining system, reinforcing and the safeguard measure that border uses.
Foundation pit belongs to temporary work, and effect is to provide a space, enables the masonry operation on basis according to design
Specified position carries out, for the safety for guaranteeing Underground Construction and foundation pit surrounding environment, it usually needs to foundation pit side-wall and
Surrounding enviroment generally use the pattern foundation pit supporting structure measure of supporting and retaining system, reinforcing, and be all at present after foundation pit work is completed under construction ground
Cell structure, and first construction foundation pit construct again basement duration it is too long, also waste of resource.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of reduction duration, facilitate installation and branch
Protect the preferable cast-in-situ bored pile deep foundation pit supporting structure of effect and its construction method.
To achieve the above object, the present invention provides the following technical scheme that
A kind of cast-in-situ bored pile deep foundation pit supporting structure, including cast-in-situ bored pile, cement mixing method, concrete-pile, crossbeam and
Base plate of foundation pit, the base plate of foundation pit outside are equipped with several cast-in-situ bored piles, several described cast-in-situ bored piles are laterally and vertical
It is correspondingly arranged, the cast-in-situ bored pile outer end is enclosed equipped with a circle cement mixing method, every two in several described cast-in-situ bored piles
The cast-in-situ bored pile of a opposition all connecting cross beams, the two sides of the crossbeam are designed with attachment device, several crossbeams one
Change setting, the cast-in-situ bored pile is equipped with the insert port for attachment device insertion, several described concrete-piles are connected to
Junction between crossbeam, the concrete-pile are mounted on base plate of foundation pit.
Further, the attachment device is each and every one several connecting rods, and the connecting rod includes hollow telescopic head, hollow solid
Fixed pole, spring and shell, the hollow telescopic head, hollow fixed link and spring are all located in shell, the hollow telescopic head bottom
Portion is equipped with telescopic mouth, has spring between the hollow telescopic rod and shell, corresponds to hollow telescopic head above the spring,
Hollow telescopic head moves down extruding spring, resets upwards when decontroling hollow telescopic head, is equipped at the top of the hollow fixed link
Top, the top is located in hollow telescopic head across telescopic mouth, and comes directly towards diameter greater than telescopic mouth diameter, the fixed link and
Shell is fixed, and the shell is fixed on crossbeam.
Further, the outer casing bottom is equipped with into geat, described into communicating inside geat and hollow fixed link, it is described in
Empty fixed link side wall is equipped with several through-holes and the first fixation hole, and the hollow telescopic head is equipped with and matches with the first fixation hole
The second fixation hole and several outlets, it is solid that the hollow telescopic head by inserted link passes through the first fixation hole and the second fixation hole
Fixed, the top is equipped with opening.
A kind of construction method of cast-in-situ bored pile deep foundation pit support, using following steps:
(1) water-stop curtain and bored pile construction: according to excavation of foundation pit sideline, the water of outer ring is laid in foundation pit sideline outer end
Soil mixing pile is reinforced come the foundation pit side soil body to building enclosure, reserves between the cement mixing method and foundation pit sideline
The position of cast-in-situ bored pile out, then several cast-in-situ bored piles are squeezed into reserved place between cement mixing method and base sideline hole
It sets, several cast-in-situ bored piles are laterally vertically all arranged in a one-to-one correspondence and surround inner ring, pass through setting brick fetal membrane shape on cast-in-situ bored pile
At insert port.
(2) excavation of foundation pit and base plate of foundation pit casting: using the soil body in central island-type in proportion slope excavation pit, base
It cheats and base plate of foundation pit frame is installed in bottom of foundation ditch after having dug, concrete-pile frame is installed on base plate of foundation pit frame, is installed
Concrete casting is carried out afterwards.
(3) assemble crossbeam: base plate of foundation pit and concrete-pile frame be poured after by transverse beam lifting to drill-pouring brick
The position of insert port, and adjusting position makes each hollow telescopic head in crossbeam attachment device be directed at corresponding insert port, is inciting somebody to action
Inserted link is extracted, and hollow telescopic head is resetted forward by the active force of spring, is inserted into inserting into the mouth for cast-in-situ bored pile, to whole
Hollow telescopic head is poured crossbeam after being all inserted into insert port.
Further, in the step (1), cast-in-situ bored pile casting needs surrounding concrete intensity to reach 75% pair of high pressure
Whirl spraying stake holes carries out high-pressure slip-casting, the first test tube before slip casting, it is ensured that the materials of slurries, type and with the various of when machine operation
Parameter meets design and parameter request, when nozzle exit pressure reaches design requirement, starts jet groutinl, reaches in jet groutinl parameter
To after specified value, immediately by the technique requirement of high-pressure rotary-spray, injection pipe is promoted, from bottom to top jet groutinl.
Further, in the step (3), crossbeam casting direction is from one end of crossbeam in proper order to the other end.?
Nearly the other end when, change from one end and feed intake round about, can avoid concrete and generate the leakiness phenomenon such as honeycomb, upper layer coagulation
Soil must can pour after lower-layer concrete vibration compacting, to guarantee that concrete has good density.
Beneficial effects of the present invention:
1, it is connected between several cast-in-situ bored piles using crossbeam, and several crossbeam integrated settings, reinforcing can be played
Effect, and the construction period can be shortened as the crossbeam of basement.
2, attachment device is used between crossbeam and cast-in-situ bored pile, constructor can be by attachment device by removing inserted link
Telescopic head insertion cast-in-situ bored pile is reserved to insert into the mouth, then carries out casting post-reinforcing.
Detailed description of the invention
Fig. 1 is cross-sectional view of the invention；
Fig. 2 is top view of the invention；
Fig. 3 is the structural schematic diagram of attachment device of the invention；
Fig. 4 is the use of attachment device of the invention with reference to figure.
Appended drawing reference: 1, cement mixing method；2, cast-in-situ bored pile；20, insert port；3, crossbeam；30, attachment device；
300, hollow telescopic head；3000, the second fixation hole；3001, it exports；3002, telescopic mouth；301, hollow fixed link；3010, it opens
Mouthful；3011, it comes directly towards；3012, the first fixation hole；3013, through-hole；3014, into geat；302, spring；303, shell；304, it inserts
Bar；4, base plate of foundation pit；5, concrete-pile.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is described in more detail.Wherein identical components are with identical
Appended drawing reference indicates.It should be noted that word "front", "rear" used in the following description, "left", "right", "up" and "down"
Refer to that the direction in attached drawing, word " bottom surface " and " top surface ", "inner" and "outside" are referred respectively to towards or away from particular elements
The direction of geometric center.
Shown in 4, the working principle of the present embodiment: the effect for impaling sealing outside is arranged in cement mixing method 1
Fruit, and the bearing pile that the cast-in-situ bored pile 2 of inner ring can be used for building, and base plate of foundation pit 4 can guarantee that foundation pit will not be by after having dug
It collapses in construction, fixing concrete stake 5 on base plate of foundation pit 4 is used to support crossbeam 3, and crossbeam 3 passes through constructor for inserted link
304 take out make attachment device 30 telescopic head reset insertion cast-in-situ bored pile 2 insert port 20 in carrying out casting reinforce more
It is convenient, it also can be as the crossbeam 3 of basement.
This cast-in-situ bored pile deep foundation pit supporting structure, including cast-in-situ bored pile 2, cement mixing method 1, concrete-pile 5,
Crossbeam 3 and base plate of foundation pit 4 are equipped with several cast-in-situ bored piles 2, several described cast-in-situ bored piles 2 on the outside of the base plate of foundation pit 4
Laterally with vertically be correspondingly arranged, 2 outer end of cast-in-situ bored pile enclose equipped with one encloses cement mixing method 1, it is described several drill
The all connecting cross beams 3 of cast-in-situ bored pile 2 that every two opposes in bored concrete pile 2, the two sides of the crossbeam 3 are designed with attachment device 30,
Several described 3 integrated settings of crossbeam, the cast-in-situ bored pile 2 are equipped with the insert port 20 being inserted into for attachment device 30,
Several described concrete-piles 5 are connected to the junction between crossbeam 3, and the concrete-pile 5 is mounted on base plate of foundation pit 4.
Cement mixing method 1 uses triaxial cement mixing pile 1, and several cement figure soil mixing piles mutually are conducted to be formed
Space for sealing.
As a kind of improved specific embodiment, the attachment device 30 is each and every one several connecting rods, the connecting rod
Including hollow telescopic head 300, hollow fixed link 301, spring 302 and shell 303, the hollow telescopic head 300, hollow fixed link
301 and spring 302 be all located in shell 303, hollow 300 bottom of telescopic head is equipped with telescopic mouth 3002, described hollow flexible
There is spring 302 between bar and shell 303, hollow telescopic head 300, hollow telescopic head 300 are corresponded to above the spring 302
It moves down and squeezes spring 302, resetted upwards when decontroling hollow telescopic head 300, top is equipped at the top of the hollow fixed link 301
First 3011, the top 3011 passes through telescopic mouth 3002 and is located in hollow telescopic head 300, and comes directly towards 3011 diameters and be greater than telescopic mouth
3002 diameters, the fixed link and shell 303 are fixed, and the shell 303 is fixed on crossbeam 3.
When telescopic head is inwardly squeezed along hollow fixed link 301, spring 302 can be squeezed, if sticking in without inserted link 304 flexible
Head can be popped up resets by spring 302, and 3002 diameter of telescopic mouth of the tail portion of telescopic head is less than and comes directly towards 3011 diameters, therefore
Telescopic head pop up when without departing from.
As a kind of improved specific embodiment, 303 bottom of shell is equipped with into geat 3014, described into geat
3014 with communicated inside hollow fixed link 301, hollow 301 side wall of fixed link is equipped with several through-holes 3013 and first solid
Determine hole 3012, the hollow telescopic head 300 is equipped with and matched second fixation hole 3000 of the first fixation hole 3012 and several
Outlet 3001, the hollow telescopic head 300 passes through the first fixation hole 3012 by inserted link 304 and the second fixation hole 3000 is fixed,
The top 3011 is equipped with opening 3010.
Inserted link 304 is passed through the first fixation hole 3012 and the second fixation hole 3000 by constructor, so that it may by hollow telescopic head 300
It is fixed, when needing the pop-up of hollow telescopic head 300, inserted link 304 is taken out, spring 302 drives the outside bullet of hollow telescopic head 300
Out, be inserted into cast-in-situ bored pile 2 insert port 20, can fixed cross beam 3, when being poured crossbeam 3, the coagulums such as concrete can pass through
Enter in hollow fixed link 301 into geat 3014, will be solidified at spring 302 by several through-holes 3013, stretched hollow
Hollow telescopic head 300 can be solidified by outlet 3001 after being filled up in drop-head 300 with cast-in-situ bored pile 2, realize and reinforce.
A kind of construction method of cast-in-situ bored pile deep foundation pit support, using following steps:
(1) water-stop curtain and cast-in-situ bored pile 2 are constructed: according to excavation of foundation pit sideline, laying outer ring in foundation pit sideline outer end
Cement mixing method 1 is reinforced come the foundation pit side soil body to building enclosure, between the cement mixing method 1 and foundation pit sideline
The position of cast-in-situ bored pile 2 is reserved, then several cast-in-situ bored piles 2 are squeezed between cement mixing method 1 and base sideline hole
Reserved location, several cast-in-situ bored piles 2, which are laterally vertically all arranged in a one-to-one correspondence, surrounds inner ring, passes through setting on cast-in-situ bored pile 2
Brick fetal membrane forms insert port 20.
(2) excavation of foundation pit and base plate of foundation pit 4 are poured: using the soil body in central island-type in proportion slope excavation pit,
Foundation pit dug after bottom of foundation ditch install 4 frame of base plate of foundation pit, on 4 frame of base plate of foundation pit install 5 frame of concrete-pile, installation
After carry out concrete casting.
(3) assemble crossbeam 3: base plate of foundation pit 4 and 5 frame of concrete-pile be poured after by the lifting of crossbeam 3 to drill-pouring
The position of the insert port 20 of brick, and adjust position to be directed at each hollow telescopic head 300 corresponding
Insert port 20 is extracted by inserted link 304, and hollow telescopic head 300 is resetted forward by the active force of spring 302, and insertion drilling fills
In the insert port 20 for infusing stake 2, crossbeam 3 is poured after whole hollow telescopic heads 300 is all inserted into insert port 20.
As a kind of improved specific embodiment, in the step (1), the casting of cast-in-situ bored pile 2 needs surrounding coagulation
Native intensity reaches 75 pairs of high-pressure rotary-spray stake holes and carries out high-pressure slip-castings, the first test tube before slip casting, it is ensured that the materials of slurries, type and matches
When the various parameters of machine operation meet design and parameter request, when nozzle exit pressure reaches design requirement, start injection note
Slurry, immediately by the technique requirement of high-pressure rotary-spray, promotes injection pipe, from bottom to top sprays after jet groutinl parameter reaches specified value
Penetrate slip casting.
As a kind of improved specific embodiment, in the step (3), 3 casting direction of crossbeam is from one end of crossbeam 3
In proper order to the other end.In the nearly other end, change from one end and feed intake round about, can avoid concrete and generate honeycomb etc.
Leakiness phenomenon, upper layer concrete must can pour after lower-layer concrete vibration compacting, to guarantee that it is good that concrete has
Density.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of cast-in-situ bored pile deep foundation pit supporting structure, including cast-in-situ bored pile (2), cement mixing method (1), concrete-pile
(5), crossbeam (3) and base plate of foundation pit (4), it is characterised in that: several cast-in-situ bored piles are equipped on the outside of the base plate of foundation pit (4)
(2), described several cast-in-situ bored piles (2) laterally be vertically correspondingly arranged, cast-in-situ bored pile (2) outer end is enclosed to be enclosed equipped with one
Cement mixing method (1), cast-in-situ bored pile (2) all connecting cross beams of every two opposition in several described cast-in-situ bored piles (2)
(3), the two sides of the crossbeam (3) are designed with attachment device (30), several described crossbeam (3) integrated settings, the drilling
Bored concrete pile (2) is equipped with the insert port (20) for attachment device (30) insertion, several described concrete-piles (5) are connected to cross
Junction between beam (3), the concrete-pile (5) are mounted on base plate of foundation pit (4).
2. a kind of cast-in-situ bored pile deep foundation pit supporting structure according to claim 1, it is characterised in that: the attachment device
It (30) is each and every one several connecting rods, the connecting rod includes hollow telescopic head (300), hollow fixed link (301), spring (302)
With shell (303), the hollow telescopic head (300), hollow fixed link (301) and spring (302) are all located in shell (303),
Hollow telescopic head (300) bottom is equipped with telescopic mouth (3002), has bullet between the hollow telescopic rod and shell (303)
Spring (302), spring (302) top correspond to hollow telescopic head (300), and hollow telescopic head (300) moves down extruding bullet
Spring (302) resets upwards when decontroling hollow telescopic head (300), is equipped with top at the top of the hollow fixed link (301)
(3011), the top (3011) passes through telescopic mouth (3002) and is located in hollow telescopic head (300), and it is big to come directly towards (3011) diameter
In telescopic mouth (3002) diameter, the fixed link and shell (303) are fixed, and the shell (303) is fixed on crossbeam (3).
3. a kind of cast-in-situ bored pile deep foundation pit supporting structure according to claim 2, it is characterised in that: the shell
(303) bottom is equipped with into geat (3014), described to communicate into geat (3014) with hollow fixed link (301) inside, described hollow
Fixed link (301) side wall is equipped with several through-holes (3013) and the first fixation hole (3012), on the hollow telescopic head (300)
Equipped with matched second fixation hole (3000) of the first fixation hole (3012) and several outlet (3001), the hollow telescopic head
(300) the first fixation hole (3012) are passed through by inserted link (304) and the second fixation hole (3000) is fixed, the top (3011) sets
There are opening (3010).
4. a kind of construction method of cast-in-situ bored pile deep foundation pit support, which is characterized in that use following steps:
(1) water-stop curtain and bored pile construction: according to excavation of foundation pit sideline, the water of outer ring is laid in foundation pit sideline outer end
Soil mixing pile (1) is reinforced come the foundation pit side soil body to building enclosure, the cement mixing method (1) and foundation pit sideline it
Between reserve the position of cast-in-situ bored pile (2), then several cast-in-situ bored piles (2) are squeezed into cement mixing method (1) and base side
Reserved location between line hole, several cast-in-situ bored piles (2) are laterally vertically all arranged in a one-to-one correspondence and surround inner ring, cast-in-situ bored pile
(2) insert port (20) are formed by setting brick fetal membrane on；
(2) excavation of foundation pit and base plate of foundation pit casting: using the soil body in central island-type in proportion slope excavation pit, foundation pit is dug
Base plate of foundation pit (4) frame is installed in bottom of foundation ditch after complete, concrete-pile (5) frame, installation are installed on base plate of foundation pit (4) frame
After carry out concrete casting；
(3) assemble crossbeam: base plate of foundation pit (4) and concrete-pile (5) frame lift crossbeam (3) to drill-pouring after being poured
The position of the insert port (20) of brick, and adjusting position is directed at each hollow telescopic head (300) in crossbeam (3) attachment device (30)
Corresponding insert port (20) is extracted by inserted link (304), and hollow telescopic head (300) passes through the active force of spring (302) forward
It resets, is inserted into the insert port (20) of cast-in-situ bored pile (2), be all inserted into insert port (20) to whole hollow telescopic heads (300)
It is poured crossbeam (3) afterwards.
5. a kind of construction method of cast-in-situ bored pile deep foundation pit support according to claim 4, it is characterised in that: the step
Suddenly in (1), cast-in-situ bored pile (2) casting needs surrounding concrete intensity to reach 75% pair of high pressure injection of high-pressure rotary-spray stake holes progress
Slurry, the first test tube before slip casting, it is ensured that material, type and the various parameters with when machine operation of slurries meet design and parameter
It is required that starting jet groutinl when nozzle exit pressure reaches design requirement and being pressed immediately after jet groutinl parameter reaches specified value
The technique requirement of high-pressure rotary-spray, promotes injection pipe, from bottom to top jet groutinl.
6. a kind of construction method of cast-in-situ bored pile deep foundation pit support according to claim 4, it is characterised in that: the step
Suddenly in (3), crossbeam (3) casting direction is from one end of crossbeam (3) in proper order to the other end, in the nearly other end, change from
One end feeds intake round about, and can avoid leakiness phenomenon, the upper layer concretes such as concrete generation honeycomb must be in lower layer's coagulation
It can be poured after native vibration compacting, to guarantee that concrete has good density.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910104750.6A CN109778872A (en) | 2019-02-01 | 2019-02-01 | A kind of cast-in-situ bored pile deep foundation pit supporting structure and its construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910104750.6A CN109778872A (en) | 2019-02-01 | 2019-02-01 | A kind of cast-in-situ bored pile deep foundation pit supporting structure and its construction method |
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| CN111335347A (en) * | 2020-03-12 | 2020-06-26 | 广东金衡建筑工程有限公司 | Cast-in-situ bored pile and construction method thereof |
| CN111962544A (en) * | 2020-08-28 | 2020-11-20 | 钱野 | Cooperative connected pile foundation construction device and construction process |
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| CN111962544B (en) * | 2020-08-28 | 2021-11-23 | 钱野 | Cooperative connected pile foundation construction device and construction process |
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