CN104775427B - Sinking pipe and construction method for freezing pore-forming cast-in-situ concrete pile - Google Patents
Sinking pipe and construction method for freezing pore-forming cast-in-situ concrete pile Download PDFInfo
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- CN104775427B CN104775427B CN201510190787.7A CN201510190787A CN104775427B CN 104775427 B CN104775427 B CN 104775427B CN 201510190787 A CN201510190787 A CN 201510190787A CN 104775427 B CN104775427 B CN 104775427B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a sinking pipe for a freezing pore-forming cast-in-situ concrete pile. The sinking pipe comprises an outer sinking pipe and an inner sinking pipe arranged inside the outer sinking pipe, wherein a closed clearance is formed between the inner sinking pipe and the outer sinking pipe; a valve is arranged at the closed part; the top of the inner sinking pipe is opened; a plurality of pressure valves are arranged on the outer side wall of the inner sinking pipe along the length direction of the inner sinking pipe. The invention also discloses a construction method for the freezing pore-forming cast-in-situ concrete pile. The construction method comprises the steps of reaming, freezing, freezing of a soil body, pore forming, casting and the like; the sinking pipe is not limited in the construction method disclosed by the invention, can be suitable for the construction of other non-freezing pore forming and can realize multiple applications by one pipe; according to the construction method, under the condition that the state of an original foundation is not completely influenced, the cast-in-situ concrete pile can be formed; the cast-in-situ concrete pile has the advantages identical with the advantages of a plastic casing concrete pile; the working efficiency can be improved, the reaming process and the concrete casting process can be separately performed, the back extrusion of the soil body can be prevented, and the pile is prevented from being broken off by extruding.
Description
Technical field
The application is related to Construction Technology field, particularly to immersed tube and ice for freezing pore-creating cast-in-situ concrete-pile
It is frozen into the construction method of hole in situ concrete pile.
Background technology
Pile body in pile foundation or composite foundation is a kind of ancient base form, and its Main Function is to pass upper load
It is handed to lower stabilizer supporting course to reach the purpose controlling upper building, the sedimentation of structures.Pile foundation engineering was in thousand of years
There is huge development in application process, be classified as driven pile, in situ pile (driven cast-in-place pile, brill according to pile making method
Hole pouring pile), static pressed pile, screw pile, pressure grouting mini pile etc..Driven cast-in-place pile refers to will carry using hammering method or vibratory drilling method
Flapper-type pile top or the steel thimble of precast reinforced concrete pile boots is had to sink in soil, then cast concrete in side is (or first in pipe
Put into steel reinforcement cage) side hammer hits or vibrates the stake of side tube drawing.Common driven cast-in-place pile form is different, common are circle
(application number: cn201310715847.3, the patent No.: zl93111926.x), y type (patent No.: zl02207382.5), x type, y-
H compound (patent No.: zl200410025713.x), t type (patent No.: zl200620140819.9) etc..But immersed tube fills
Note stake in vibration work progress on around pile body impact big, and easily occur broken pile, undergauge, quality is wayward, monitoring is difficult,
The shortcomings of quality accident is many, fullness coefficient is excessive.
A kind of plastic casing on-site concrete pile was had to apply before the application, by immersed tube and single wall screw plastic sheath
Pipe is squeezed in ground simultaneously and is stayed plastic bushing in ground.This kind of way has two benefits: (1) can beating plastic bushing
If with the pouring to separate and carry out of concrete, improve efficiency of construction；(2) plastic bushing can stop the soil body back to squeeze (in pipe water filling put down
Weighing apparatus soil pressure) it is ensured that the effect of pile body diameter.Though but this pile-type can be put down using the mode of water filling in pipe in actual applications
Soil pressure outside weighing apparatus pipe, but usually occur that immersed tube extracts rear plastic bushing by damaged situation, and inexpensive plastic sleeve pipe pair
The soil body can pollute, and usually can affect the water quality of ground depths.
Application content
The purpose of the application is exactly to provide a kind of immersed tube for freezing pore-creating cast-in-situ concrete-pile, and this immersed tube can overcome
Existing driven cast-in-place pile in vibration work progress on around pile body impact big, and the technical problems such as broken pile, undergauge easily occur, and
Solve plastic casing on-site concrete pile and there is the technical problem to soil pollution.
Further object is the cast-in-place concrete pile construction method providing a kind of energy to use freezing method pore-forming, should
Construction method improves efficiency of construction, can separately carry out the casting process of reaming procedure and concrete it is ensured that being not in
Squeeze off the situation of stake.
The purpose of the application is achieved through the following technical solutions:
A kind of immersed tube for freezing pore-creating cast-in-situ concrete-pile, immersed tube bottom arranges the prefabricated shoe of flap valve, described immersed tube
Including outer immersed tube and the interior immersed tube being arranged within outer immersed tube, it is airtight annular compartment between interior immersed tube and outer immersed tube, airtight
Place is provided with valve, interior immersed tube open top, and the lateral wall of interior immersed tube is evenly arranged with multiple pressure valve along its length.
Installing hole for installing pressure valve is opened up on described outer immersed tube, pressure valve includes spring, fixed block and deflating cap,
One end of spring is fixed on the lateral wall of interior immersed tube, and the other end of spring is connected with one end of fixed block, fixed block another
End movable is connected on deflating cap, and deflating cap includes cap bar and is arranged at the cap at cap masthead end, and the cap of deflating cap sets
It is placed on the lateral wall of outer immersed tube, the external diameter of cap is more than the installing hole of outer immersed tube；Spring is in tension state so that deflating cap
It is close on the lateral wall of outer immersed tube, be closed.
Described spring is cold-resistant material.
A kind of construction method of frost pore-creating cast-in-situ concrete-pile, comprises the following steps:
The first step, reaming；Immersed tube is set to ground depths；
Second step, frost；Fill frozen material by the annular compartment between the inside immersed tube of valve door and outer immersed tube, make
Soil body frost outside outer immersed tube；
3rd step, pore-forming；It is drawn past the immersed tube after second step is processed, form pile body hole；
4th step, carries out concreting in the pile body hole being formed in the 3rd step.
Described frozen material is liquid nitrogen.
The application is had the advantage that using technique scheme
Immersed tube for freezing pore-creating cast-in-situ concrete-pile described herein does not limit to and is applied to described herein applying
Work method, and can be applicable in the construction that other do not freeze pore-forming, it is possible to achieve one tube multipurpose.
Construction method described herein, can form cast-in-place coagulation under not affecting original ground state status completely
Native stake, and have and plastic sleeve concrete pile identical advantage, both can improve efficiency of construction, by reaming procedure and can mix again
The process that solidifying soil pours separately is carried out, and the soil body can be stoped back to squeeze, will not squeeze off stake.
Construction method described herein can guarantee that pile body diameter, can be prevented effectively from the surrounding soil pile body causing back to squeeze
Undergauge, the phenomenon of broken pile, the ice-bound hole of formation has not collapse hole, impermeable effect.
Construction method construction described herein is simple to operation, and in situ concrete pile does not limit to and circle, may be used yet
For the opposite sex stake such as y shape, t shape.
Brief description
Fig. 1 is immersed tube sectional view；
Fig. 2 is pressure valve structural representation；
Fig. 3 is pressure valve operating diagram；
Fig. 4 irrigates schematic diagram for frozen material；
Fig. 5 freezes the zone of influence for after the completion of frozen material perfusion；
In figure: immersed tube in 1；2 outer immersed tube；The prefabricated shoe of 3 flap valves；4 pressure valve；5 valves；
6 springs；7 fixed blocks；8 deflating caps.
Specific embodiment
As shown in figure 1, a kind of immersed tube for freezing pore-creating cast-in-situ concrete-pile, including outer immersed tube 2 be arranged at outer heavy
Interior immersed tube 1 within pipe 2, is airtight gap between interior immersed tube 1 and outer immersed tube 2, and airtight place is provided with valve 5, and interior immersed tube 1 pushes up
Portion is uncovered, and immersed tube bottom arranges the prefabricated shoe of flap valve 3；Uniformly set along interior immersed tube lateral wall length direction in the circumferential clearance of immersed tube
It is equipped with multiple pressure valve 4.
Interior immersed tube 1 a diameter of 15 ~ 30cm, wall thickness is 2cm, the diameter 8cm bigger than the diameter of interior immersed tube 1 of outer immersed tube 2
Left and right, wall thickness is 2cm.By the outside immersed tube 2 of valve 5 and perfusion frozen material in the gap of internal immersed tube 1, freeze herein
Material is preferably liquid nitrogen, is provided with pressure valve 4 in the gap of immersed tube, backs down pressure valve 4 by internal pressure, injects in the soil body
Liquid nitrogen.
As shown in Fig. 2 the installing hole for installing pressure valve 4 is opened up on described outer immersed tube 2, pressure valve 4 include spring 6,
Fixed block 7 and deflating cap 8, one end of spring 6 is fixed on the lateral wall of interior immersed tube 1, the other end of spring 6 and fixed block 7
One end connects, and the other end movable of fixed block 7 is connected on deflating cap 8.
Preferably, deflating cap 8 includes cap bar and is arranged at the cap at cap masthead end, and the cap of deflating cap 8 is arranged at outer sinking
On the lateral wall of pipe 2, the external diameter of cap is more than the installing hole of outer immersed tube 2；The cap bar of deflating cap 8 is just installed on outer immersed tube 2
In the installing hole opening up, cap bar offers the installing hole for installing fixed block 7.
Fixed block 7 can screw in the cap bar of deflating cap 8 by nut form, and the insert depth of fixed block 7 and deflating cap 8 can
It is adjusted by rotary switch cap 8 so that spring 6 is in tension state so that the cap of deflating cap 8 is close to outer immersed tube 2
Lateral wall on it is ensured that deflating cap 8 is initially in closed mode.Fixed block 7 is so connected with deflating cap 8, can be according to outside difference
Fixed block 7 can be displaced outwardly adjusting spring rate by portion's situation (soil pressure, pore water pressure) by rotary switch cap 8.
Deflating cap 8 and immersed tube coupling part adopt waterproof cold resistant material to make, and have sealing.When deflating cap 8 is in pass
During closed state, immersed tube external water etc. on the one hand can be stoped to enter immersed tube, on the other hand also can stop liquid nitrogen to exosmosis.
Described spring 6 be cold-resistant material it is ensured that its be in still elastic in liquid nitrogen.
As shown in figure 3, valve 5 note can be passed through by outside liquid nitrogen device for filling in gap between interior immersed tube 1 and outer immersed tube 2
Enter liquid nitrogen, deflating cap 8 is closed, the outside soil body and water can not enter inside outer immersed tube 2.After injection liquid nitrogen, interior heavy
When pipe 1 is sufficiently large with outer immersed tube 2 inner space pressure (more than external pressure) so that the pressure acting on fixed block 7 increases,
When this pressure is more than the maximum holding capacity of spring 6, spring 6 extends, and now deflating cap 8 is outwards opened, and internal liquid nitrogen is to extravasation
Go out, in injection immersed tube surrounding soil.After in immersed tube, liquid nitrogen pressure lowers, deflating cap 8 is automatically switched off.
As shown in figure 4, when a kind of construction method of frost pore-creating cast-in-situ concrete-pile is used for single pile construction, can walk by following
Rapid:
The first step, reaming；Immersed tube is set to ground depths；
Second step, frost casting concrete；By noting in the airtight gap between the inside immersed tube of valve 1 and outer immersed tube 2
Full frozen material, makes the soil body outside immersed tube freeze, simultaneously casting concrete in inside immersed tube 1；
3rd step, when the half of filling concrete to whole pile body volume or after perfusion liquid nitrogen 5min, starts to vibrate
Immersed tube makes inner concrete closely knit, simultaneously on pull out immersed tube.
Pore-forming and then poured again can certainly first be freezed in second step, rather than as mentioned above frost simultaneously and
Pour.
Note gradually reducing during upper pulling out and insert liquid nitrogen.
When carrying out construction of pile groups, can be as follows:
The first step, reaming；Immersed tube is set to ground depths；
Second step, frost；Fill frozen material by the airtight gap between the inside immersed tube of valve 1 and outer immersed tube 2, make
The soil body frost in outer immersed tube 2 outside；
3rd step, pore-forming；It is drawn past the immersed tube after second step is processed, form pile body hole；
4th step, repeats the first to three step and sets next pile, form multiple pile body holes；
5th step, carries out concreting in the pile body hole being formed in the 4th step.
In the above construction of pile groups, when in place, pile body hole all sets and completes and carry out stake in place when stake holes is complete
Batch pour, primarily to the consideration of efficiency of construction.For considering the impact of concrete properties, should add on a small quantity in concrete
Antifreezing agent.
As shown in figure 5, can there is hard frost zone and common frost zone in stake surrounding soil after injecting liquid nitrogen in interior immersed tube 1
Two regions.When carrying out construction of pile groups it is also contemplated that impact, so that stake is beaten in common frost zone outward flange as far as possible.
With the above-mentioned desirable embodiment according to the application for enlightenment, by above-mentioned description, relevant staff is complete
Entirely various change and modification can be carried out in the range of without departing from this application technological thought.The technology of this application
The content that property scope is not limited in description it is necessary to determine its technical scope according to right.
Claims (5)
1. a kind of immersed tube for freezing pore-creating cast-in-situ concrete-pile, the immersed tube bottom setting prefabricated shoe of flap valve (3), its feature exists
In: described immersed tube includes outer immersed tube (2) with to be arranged at outer immersed tube (2) internal interior immersed tube (1), interior immersed tube (1) and outer immersed tube (2)
Between be airtight annular compartment, airtight place is provided with valve (5), interior immersed tube (1) open top, interior immersed tube (1) and outer immersed tube
(2) between, the length direction along interior immersed tube (1) is evenly arranged with multiple pressure valve (4)；Open up for pacifying on described outer immersed tube (2)
The installing hole of dress pressure valve (4), pressure valve (4) includes spring (6), fixed block (7) and deflating cap (8), and one end of spring (6) is solid
On the lateral wall of interior immersed tube (1), the other end of spring (6) is connected with one end of fixed block (7), fixed block (7) another
End movable is connected on deflating cap (8)；Deflating cap (8) includes cap bar and the cap being arranged at cap masthead end, deflating cap (8)
Cap be arranged on the lateral wall of outer immersed tube (2), the external diameter of cap is more than the installing hole of outer immersed tube (2)；Spring (6) is in and is subject to
Tension state, so that the cap of deflating cap (8) is close on the lateral wall of outer immersed tube (2), is closed.
2. the immersed tube for freezing pore-creating cast-in-situ concrete-pile according to claim 1 it is characterised in that: described spring
(6) it is cold-resistant material.
3. a kind of frost pore-creating cast-in-situ concrete-pile construction method it is characterised in that: comprise the following steps:
The first step, reaming；Immersed tube is set to ground depths；Described immersed tube include outer immersed tube (2) be arranged at outer immersed tube (2) in
The interior immersed tube (1) in portion, is airtight annular compartment between interior immersed tube (1) and outer immersed tube (2), and airtight place is provided with valve (5), interior
Immersed tube (1) open top, is evenly arranged with multiple pressures along the length direction of interior immersed tube (1) between interior immersed tube (1) and outer immersed tube (2)
Power valve (4)；Installing hole for installing pressure valve (4) is opened up on described outer immersed tube (2), pressure valve (4) includes spring (6), consolidates
Determine block (7) and deflating cap (8), one end of spring (6) is fixed on the lateral wall of interior immersed tube (1), the other end of spring (6) with solid
The one end determining block (7) connects, and the other end movable of fixed block (7) is connected on deflating cap (8)；Deflating cap (8) includes cap
Bar and the cap being arranged at cap masthead end, the cap of deflating cap (8) is arranged on the lateral wall of outer immersed tube (2), the external diameter of cap
Installing hole more than outer immersed tube (2)；Spring (6) is in tension state so that the cap of deflating cap (8) is close to outer immersed tube (2)
Lateral wall on, be closed；
Second step, frost；Fill frost material by valve (5) the inwardly annular compartment between immersed tube (1) and outer immersed tube (2)
Material, makes the soil body outside outer immersed tube (2) freeze；
3rd step, pore-forming；It is drawn past the immersed tube after second step is processed, form pile body hole；
4th step, carries out concreting in the pile body hole being formed in the 3rd step.
4. according to claim 3 frost pore-creating cast-in-situ concrete-pile construction method it is characterised in that: described frost material
Expect for liquid nitrogen.
5. according to claim 3 frost pore-creating cast-in-situ concrete-pile construction method it is characterised in that: the described first step
In the immersed tube bottom used setting prefabricated shoe of flap valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510190787.7A CN104775427B (en) | 2015-04-22 | 2015-04-22 | Sinking pipe and construction method for freezing pore-forming cast-in-situ concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510190787.7A CN104775427B (en) | 2015-04-22 | 2015-04-22 | Sinking pipe and construction method for freezing pore-forming cast-in-situ concrete pile |
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| Publication Number | Publication Date |
|---|---|
| CN104775427A CN104775427A (en) | 2015-07-15 |
| CN104775427B true CN104775427B (en) | 2017-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510190787.7A Active CN104775427B (en) | 2015-04-22 | 2015-04-22 | Sinking pipe and construction method for freezing pore-forming cast-in-situ concrete pile |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114855770B (en) * | 2022-03-28 | 2024-04-26 | 中铁时代建筑设计院有限公司 | Device and method for dissipating excess pore water pressure generated by pile sinking of prefabricated pipe pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102619213B (en) * | 2012-02-16 | 2014-07-30 | 中国矿业大学(北京) | Freezing apparatus with double circulating systems |
| US9611608B2 (en) * | 2012-03-28 | 2017-04-04 | Daniel Mageau | Zone freeze pipe |
| CN203782681U (en) * | 2014-04-08 | 2014-08-20 | 北方燕盛工程技术有限公司 | Grouting check device for freezing pipe |
| CN104234044B (en) * | 2014-09-24 | 2015-12-30 | 杭州江润科技有限公司 | A kind of freezing process guard aperture shaped pile piling method |
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