CN107574817A - A kind of constructing device and construction method for superpressure retaining wall cast-in-situ bored pile - Google Patents
A kind of constructing device and construction method for superpressure retaining wall cast-in-situ bored pile Download PDFInfo
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- CN107574817A CN107574817A CN201710846274.6A CN201710846274A CN107574817A CN 107574817 A CN107574817 A CN 107574817A CN 201710846274 A CN201710846274 A CN 201710846274A CN 107574817 A CN107574817 A CN 107574817A
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- steel pipe
- bored pile
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- pipe
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Abstract
The invention discloses a kind of constructing device and construction method for superpressure retaining wall cast-in-situ bored pile, constructing device includes the base, top layer steel pipe and some middle level steel pipes for being embedded with embedded steel tube；The both ends that embedded steel tube extends the upper end of base, the lower end of top layer steel pipe, and middle level steel pipe are equipped with the flange mutually fastened and connect for three；Embedded steel tube forms the centre bore entered for cast-in-situ bored pile in chassis interior；The side wall of top layer steel pipe is provided with sludge discharge pipe.During construction, determine that sludge discharge pipe apart from ground level, installs middle level steel pipe and top layer steel pipe successively from the bottom to top on embedded steel tube according to the design mud pressure size in hole during bored pile construction.Its advantage is：Face loose crushing, the complex random systems such as soft, cementing properties is poor when, to provide bigger lateral mud pressure, therefore by the mud pressure increase in hole, the problems such as being reduced the hole wall collapse that solves to occur in the work progress of cast-in-situ bored pile, aperture.
Description
Technical field
The invention belongs to drilling hole bored concrete pile technology field, and in particular to a kind of construction for superpressure retaining wall cast-in-situ bored pile
Device and construction method.
Background technology
When carrying out construction operation using the holing with slurry wall protection bored concrete pile of routine, because the balance of original place ply stress is destroyed,
Large effect can be produced to the stability of hole wall.In the presence of reservoir stress, cause hole wall destroy form can be divided into it is crowded
Bad and tension failure is crushed, wherein it is again failure mode main in drilling construction that extruding, which destroys,.It is poor in loose crushing, cementing properties
Or when bored pile construction is carried out in soft stratum, conventional bored pile construction method carries out pore-forming, and hole wall is easily
Cave in, or aperture occurs and shrinks, influence pile quality, and closely structures are influenceed big.
In order to prevent hole wall collapse from being shunk with aperture, to reduce the influence to closely structures, Patent No.
A kind of ZL201210242665.4 (cast-in-situ bored pile construction method with tiny disturbance) patent proposes the steel sleeve of rotation press-in in advance,
Carry out again mud circulation pore-forming bored pile construction method, but the steel sleeve spinning of this engineering method bury operating expenses height,
Easily closely structures are had an impact when steel sleeve spinning buries, and steel sleeve does not further take out, and thus causes cast-in-situ bored pile
Construction cost it is high, and the bearing capacity of drilling pouring stake will be influenceed.Recycled if steel sleeve is taken out again, to low coverage
Secondary effect is produced from structures.
In order to reduce hole wall collapse, dewatering well will be being beaten around bored pile construction in the prior art, in pore-forming
Precipitation is carried out to dewatering well during operation, to increase the difference of mud pressure and surrounding formation water pressure in hole.But this technology is constructed
Process is more, and construction cost is high, and the difference of mud pressure and surrounding formation water pressure is limited in maximum hole.
The content of the invention
According to the deficiencies of the prior art described above, It is an object of the present invention to provide one kind is used for superpressure retaining wall drill-pouring
The constructing device of stake and construction method, the constructing device and construction method face loose crushing, the complexity such as soft, cementing properties is poor
During soil layer, to provide bigger lateral mud pressure, therefore the mud pressure in hole is increased, to solve applying in cast-in-situ bored pile
The problems such as hole wall collapse that occurs during work, aperture reduce.
The object of the invention is realized and completed by following technical scheme：
A kind of constructing device for superpressure retaining wall cast-in-situ bored pile, it is characterised in that：The constructing device is pre- including being embedded with
Bury the base, top layer steel pipe and some middle level steel pipes of steel pipe；The embedded steel tube and the top layer steel pipe, the middle level steel pipe
Caliber is identical, and the embedded steel tube extends the upper end of the base, the lower end of the top layer steel pipe, and the middle level steel pipe
Both ends be equipped with the flange mutually fastened and connect for three；The embedded steel tube forms in the chassis interior and supplies cast-in-situ bored pile
The centre bore of entrance, the axis of the centre bore are located on the base center axis line；The side wall of the top layer steel pipe is provided with mud
Discharge pipe, the sludge discharge pipe end are provided with flange.
The constructing device also includes some elastic sealing gaskets, the flange of the elastic sealing gasket and the top layer steel pipe and
Screw shape is adapted on the flange.
The base is columned reinforced concrete structure, and its outer radius is 3-5 times of cast-in-situ bored pile diameter, and thickness is
1-2m；The center pore radius is more than design hole radius 3-5cm.
The flange of the embedded steel tube is higher by the base top surface 15-20cm, the interval between the embedded steel tube screw
For 5-15cm.
The joint portion of the sludge discharge pipe and the top layer steel pipe is to the top layer steel pipe top distance 30-70cm.
A kind of construction method for being related to the constructing device for superpressure retaining wall cast-in-situ bored pile described in any one, it is special
Sign is that the construction method comprises the following steps：
A, place is reconnoitred, determines the diameter and depth of cast-in-situ bored pile, and during the bored pile construction in hole
Design mud pressure size；And make embedded steel tube, top layer steel pipe and Duo Gen middle levels steel pipe based on surveys；
B, smooth hardening is carried out to place, and excavates base at design hole and pours groove, it is 3-5 that the base, which pours groove radius,
The cast-in-situ bored pile diameter again, depth 1-2m；
The base is poured to the plain concrete cushion layer that 10cm is set in groove, and reinforcing bar is installed c,；Laid at the design hole
The embedded steel tube；Poured in place concrete forms base afterwards；Afterwards according to setting in hole during the bored pile construction
Meter mud pressure size determines sludge discharge pipe apart from ground level, on the embedded steel tube from the bottom to top successively described in installation
Middle level steel pipe and the top layer steel pipe, and the embedded steel tube, the middle level steel pipe and the top are sealed by elastic sealing gasket
Gap at joint between layer steel pipe；The mud effuser of installation connection sedimentation basin on the sludge discharge pipe of the top layer steel pipe；
D, the mud prepared is pressed into the hollow drill pipe of pore-forming equipment by drilling machine equipment；
E, drilling machine equipment carries out mud Drilling by inverse circulation operation；
F, after pore-forming to projected depth, then borehole cleaning, steel reinforcement cage is laid, and carries out filling concrete, and filling concrete height is not
The base top surface can be exceeded；
G, after the filling concrete of the cast-in-situ bored pile completes 48-60 hours, then the middle level steel pipe and the top are removed
Layer steel pipe, and by the Partial Resection above ground level of the embedded steel tube on the base.
It is an advantage of the invention that：（1）Any pore size can generally be adapted to, the cast-in-situ bored pile of various complex random systems is applied
Work；Compared with conventional bored pile construction, the present invention enables the situation of hole wall collapse largely to suppress, and more makes aperture
The incidence of diminution greatly reduces, and avoids the unnecessary damage to property in work progress；（2）The present invention is neatly controlled
System beyond ground mud liquid level, so as to the mud pressure in control hole, to prevent hole wall collapse in pore forming process, contracting
Phenomena such as footpath；And by the fixation of base, solve hole position deflection, the problems such as aperture collapses；In device between steel pipe, steel
Connected between pipe and base by flange, improve the overall stability of device.
Brief description of the drawings
Fig. 1 is the constructing device schematic diagram for being used for superpressure retaining wall cast-in-situ bored pile in the present invention；
Fig. 2 is the close-up schematic view at A in Fig. 1 of the present invention.
Embodiment
The feature of the present invention and other correlated characteristics are described in further detail by embodiment below in conjunction with accompanying drawing, with
It is easy to the understanding of technical staff of the same trade：
Such as Fig. 1,2, mark 1-12 is respectively in figure：Base 1, embedded steel tube 2, centre bore 21, ring flange 22, middle level steel pipe 3, method
Blue disk 31, bolt 32, top layer steel pipe 4, sludge discharge pipe 41, elastic sealing gasket 5, mud effuser 6, hardened ground 7, sedimentation basin
8th, hollow drill pipe 9, drill bit 10, slush pump 11, mud flow into pipe 12.
Embodiment：As shown in Figure 1, 2, the present embodiment provides a kind of construction for superpressure retaining wall cast-in-situ bored pile and filled first
Put, including：
Base 1
Base 1 is cylinder, using reinforced concrete structure.The outer radius of base 1 is 3-5 times of cast-in-situ bored pile diameter, and thickness is
1—2m.The outer rim of base 1 rotates about the axis thereof symmetrical reserved steel bar ring provided with 4.Reserved steel bar ring is circular or ellipse,
Radius is 3-5cm, and its bottom and the plane of base 1 are tangent.
Base 1 is embedded with embedded steel tube 2.The axis of embedded steel tube 2 is located at the geometric center of base 1, and embedded steel tube 2 is the bottom of at
Seat 1 is internally formed the centre bore 21 entered for cast-in-situ bored pile, the big 3-5cm of the radius ratio of centre bore 21 design hole radius.In advance
Bury the upper end of steel pipe 2 and be additionally provided with ring flange 22.Ring flange 22 is higher by the top surface 15-20cm of base 1, thereon between screw at intervals of 5-
15cm。
Middle level steel pipe 3 and top layer steel pipe 4
Embedded steel tube 2, middle level steel pipe 3 and top layer steel pipe 4 have identical caliber.Wherein：
The lower end of top layer steel pipe 4, and the both ends of middle level steel pipe 3 are equipped with the flange being adapted with ring flange 22.Top layer steel pipe
Side wall away from being provided with sludge discharge pipe 41 at the 30-70cm of its upper end.The end of sludge discharge pipe 41, which is provided with, to be used to install mud outflow
The flange of pipe 6, the radius of sludge discharge pipe 41 are not less than 10cm.
Offered at the top outer rim of top layer steel pipe 4 identical with reserved steel bar number of rings amount（It is 4 in the present embodiment）Pair
Claim the hole of distribution.Each distance of the hole away from the top edge of top layer steel pipe 4 is 3-5cm, and the radius of hole is 3-5cm.Pass through steel
The connection ring of the hole of top layer steel pipe 4 and base 1 is attached fixation by cable, to increase its stability.
In addition, constructing device can also include some elastic sealing gaskets 5.Method between elastic sealing gasket 5 and middle level steel pipe 3
Blue disk 31 and eyelet is adapted thereon.In assembling, sealed between ring flange 31 by elastic sealing gasket 5, mud is prevented to reach
Seepage is starched, and is fixedly connected by bolt 32.
Below in conjunction with using the novel construction method after the device, above-mentioned constructing device occupation mode is described in detail.
Construction method comprises the following steps：
A, place is reconnoitred, highly determined according to the stability of the soil body, physical and mechanical property, dense state, level of ground water
The diameter and depth of cast-in-situ bored pile, and design mud pressure size during bored pile construction in hole；
And make embedded steel tube 2, top layer steel pipe 4 and Duo Gen middle levels steel pipe 3 as described above based on surveys；Middle level steel pipe 3
Quantity and length should according to design mud pressure size be designed；In a preferred embodiment, middle level steel pipe 3 should be divided into
2 meters of specifications（More）With 1 meter of specification（1）, so no matter design mud pressure be it is how many, can be by error by combinations thereof
Control is within 0.5m.It should be noted that during each steel pipe excessive height more than ground, need to take appropriate prevents middle level
Steel pipe 3 and the run-off the straight of top layer steel pipe 4 or the measure toppled over, such as add diagonal brace or oblique pull steel wire rope；
B, smooth hardening is carried out to place, and excavates base at design hole and pours groove, base pours groove radius and bored for 3-5 times
Hole pouring pile diameter, depth 1-2m；
C, base is poured into the plain concrete cushion layer that trench bottom sets 10cm, and reinforcing bar is installed；Pre-buried steel is laid at design hole
Pipe 2, the flange of embedded steel tube 2 basset at least 15-20cm；Poured in place concrete forms base 1 afterwards；Base 1 hardens
Hardened ground 7 is done after complete thereon；
Determine sludge discharge pipe 41 apart from ground height according to the design mud pressure size in hole during bored pile construction afterwards
Degree, middle level steel pipe 3 and top layer steel pipe 4 are installed successively from the bottom to top on embedded steel tube 2, and sealed by elastic sealing gasket 5 pre-
Bury the gap between steel pipe 2, middle level steel pipe 3 and top layer steel pipe 4.Installation connection precipitation on the sludge discharge pipe 41 of top layer steel pipe 4
The mud effuser 6 in pond 8.Now, sludge discharge pipe 41 is big apart from ground level as design mud pressure on top layer steel pipe 4
It is small；
D, the mud prepared is pressed into mud and flows into pipe 12 by slush pump 11, enters finally into the hollow drill pipe 9 of pore-forming equipment
It is interior；
E, drilling machine equipment carries out mud Drilling by inverse circulation operation；
F, after pore-forming to projected depth, then borehole cleaning, steel reinforcement cage is laid, and carries out filling concrete, and filling concrete height is not
The top surface of base 1 can be exceeded（Ground）；
G, after the filling concrete of hole pouring pile to be drilled completes 48-60 hours, then middle level steel pipe 3 and top layer steel pipe 4 are removed, and will
The Partial Resection above ground level of embedded steel tube 2 on base 1.
In above-mentioned steps, completed from bored pile construction to filling concrete, mud remains at top layer steel pipe 4
The height of sludge discharge pipe 41, so as to the mud pressure in the bored pile construction process mesopore that improves.
The beneficial effect of the present embodiment is：The present embodiment can generally adapt to any pore size, the brill of various complex random systems
Hole pouring pile is constructed.Compared with conventional bored pile construction, the present invention enables the situation of hole wall collapse largely to press down
System, more greatly reduce the incidence that aperture is shunk, avoid the unnecessary damage to property in work progress.
The present embodiment neatly controls the mud liquid level beyond ground, so that the mud pressure in control hole, to prevent
Only pore forming process middle hole wall cave in, undergauge phenomena such as.And by the fixation of base, solve hole position deflection, aperture collapses
The problems such as.Connected by flange between steel pillar in device, connected between steel pillar and base by flange；It is complete more than ground
When total height is larger after portion's fastener for connection, shaped steel diagonal brace or surrounding stretching wire rope further reinforcing group can be applied by surrounding again
Steel loading pipe, improve the overall stability of assembling steel pipe.
Claims (6)
- A kind of 1. constructing device for superpressure retaining wall cast-in-situ bored pile, it is characterised in that：The constructing device includes being embedded with Base, top layer steel pipe and some middle level steel pipes of embedded steel tube；The embedded steel tube and the top layer steel pipe, the middle level steel pipe Caliber it is identical, the embedded steel tube extends the upper end of the base, the lower end of the top layer steel pipe, and the middle level steel The both ends of pipe are equipped with the flange mutually fastened and connect for three；The embedded steel tube forms in the chassis interior and supplies drill-pouring The centre bore that stake enters, the axis of the centre bore are located on the base center axis line；The side wall of the top layer steel pipe is provided with mud Discharge pipe is starched, the sludge discharge pipe end is provided with flange.
- A kind of 2. constructing device for superpressure retaining wall cast-in-situ bored pile according to claim 1, it is characterised in that：It is described Constructing device also includes some elastic sealing gaskets, the elastic sealing gasket and spiral shell on the flange of the top layer steel pipe and the flange Hole shape is adapted.
- A kind of 3. constructing device for superpressure retaining wall cast-in-situ bored pile according to claim 1, it is characterised in that：It is described Base is columned reinforced concrete structure, and its outer radius is 3-5 times of cast-in-situ bored pile diameter, thickness 1-2m；In described Heart pore radius is more than design hole radius 3-5cm.
- A kind of 4. constructing device for superpressure retaining wall cast-in-situ bored pile according to claim 1, it is characterised in that：It is described The flange of embedded steel tube is higher by the base top surface 15-20cm, between the embedded steel tube screw at intervals of 5-15cm.
- A kind of 5. constructing device for superpressure retaining wall cast-in-situ bored pile according to claim 1, it is characterised in that：It is described The joint portion of sludge discharge pipe and the top layer steel pipe is to the top layer steel pipe top distance 30-70cm.
- A kind of 6. construction for being related to the constructing device for superpressure retaining wall cast-in-situ bored pile described in claim 1-5 any one Method, it is characterised in that the construction method comprises the following steps：A, place is reconnoitred, determines the diameter and depth of cast-in-situ bored pile, and during the bored pile construction in hole Design mud pressure size；And make embedded steel tube, top layer steel pipe and Duo Gen middle levels steel pipe based on surveys；B, smooth hardening is carried out to place, and excavates base at design hole and pours groove, it is 3-5 that the base, which pours groove radius, The cast-in-situ bored pile diameter again, depth 1-2m；The base is poured to the plain concrete cushion layer that 10cm is set in groove, and reinforcing bar is installed c,；Laid at the design hole The embedded steel tube；Poured in place concrete forms base afterwards；Afterwards according to setting in hole during the bored pile construction Meter mud pressure size determines sludge discharge pipe apart from ground level, on the embedded steel tube from the bottom to top successively described in installation Middle level steel pipe and the top layer steel pipe, and the embedded steel tube, the middle level steel pipe and the top are sealed by elastic sealing gasket Gap at joint between layer steel pipe；The mud effuser of installation connection sedimentation basin on the sludge discharge pipe of the top layer steel pipe；D, the mud prepared is pressed into the hollow drill pipe of pore-forming equipment by drilling machine equipment；E, drilling machine equipment carries out mud Drilling by inverse circulation operation；F, after pore-forming to projected depth, then borehole cleaning, steel reinforcement cage is laid, and carries out filling concrete, and filling concrete height is not The base top surface can be exceeded；G, after the filling concrete of the cast-in-situ bored pile completes 48-60 hours, then the middle level steel pipe and the top are removed Layer steel pipe, and by the Partial Resection above ground level of the embedded steel tube on the base.
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| CN201710846274.6A CN107574817A (en) | 2017-09-19 | 2017-09-19 | A kind of constructing device and construction method for superpressure retaining wall cast-in-situ bored pile |
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| CN201710846274.6A CN107574817A (en) | 2017-09-19 | 2017-09-19 | A kind of constructing device and construction method for superpressure retaining wall cast-in-situ bored pile |
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| CN107574817A true CN107574817A (en) | 2018-01-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108442371A (en) * | 2018-05-17 | 2018-08-24 | 中铁十六局集团第三工程有限公司 | One kind stake combination casing structure and its construction method suitable for Soft Clay water |
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| CN103967032A (en) * | 2014-04-16 | 2014-08-06 | 青岛理工大学 | Double-protective-cylinder cast-in-situ bored pile used for highly-corrosive salty soil and construction method of double-protective-cylinder cast-in-situ bored pile |
| CN204456094U (en) * | 2015-01-28 | 2015-07-08 | 沈阳铁道勘察设计院有限公司 | Bored pile environmental protection casing |
| CN206090520U (en) * | 2015-12-08 | 2017-04-12 | 南京林业大学 | Solid native dado drilling bored concrete pile of microorganism |
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| CN108442371A (en) * | 2018-05-17 | 2018-08-24 | 中铁十六局集团第三工程有限公司 | One kind stake combination casing structure and its construction method suitable for Soft Clay water |
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