CN112609752A - Recyclable double-layer steel sleeve for bored pile static load test and method - Google Patents
Recyclable double-layer steel sleeve for bored pile static load test and method Download PDFInfo
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- CN112609752A CN112609752A CN202011394071.6A CN202011394071A CN112609752A CN 112609752 A CN112609752 A CN 112609752A CN 202011394071 A CN202011394071 A CN 202011394071A CN 112609752 A CN112609752 A CN 112609752A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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
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Abstract
The invention relates to a recyclable double-layer steel sleeve for a bored pile static load test and a method thereof, wherein rubber water stops are arranged at the top end and the bottom end of a double sleeve in the double-layer steel sleeve, and sealing materials are arranged in the upper section and the lower section of the double sleeve and are used for temporary filling; four special-shaped lifting lugs are welded on the inner sleeve and the outer sleeve at the top end of the double sleeve; an auxiliary steel lifting lug is arranged at the position 2/3 downwards from the top of the double-sleeve; the method comprises the following steps: 1) the method comprises the following steps of (1) designing a recyclable double-sleeve structure, 2) assembling and combining forms of the recyclable double-sleeve, 3) hoisting and installing methods of the recyclable double-sleeve, and 4) dismantling and recycling after the static load test of the outer sleeve is finished. The invention solves the problems that slurry and concrete enter the wall of the double-sleeve pipe due to the top opening of the traditional double-sleeve pipe and the double-sleeve pipe is fixed at the hole opening of the cast-in-situ bored pile after the installation is finished, and the outer sleeve pipe can be recycled and reused after the experiment is finished.
Description
Technical Field
The invention relates to a construction and detection device for a cast-in-situ bored pile test, in particular to a cast-in-situ bored pile test device for construction engineering.
Background
With the increasing shortage of urban building land, underground spaces of buildings such as large urban complexes and important transportation hubs are developed more and more deeply, and ultra-deep basements are more and more common.
In consideration of the precision requirement of the bored concrete pile static load test, in order to calculate the bored concrete pile bearing capacity more accurately and ensure that the pile foundation design tends to perfect economy, therefore, a double-casing device is often arranged above the excavation surface of the bored concrete pile static load test pile, so that the data acquired in the pile foundation static load detection process can achieve the most accurate and ideal effect.
The conventional double-sleeve for the bored concrete pile static load test has a water stop, a double-sleeve, an annular rib plate and the like, but temporary fixers are not arranged at the top end and the bottom end of the double-sleeve, so that the double-sleeve is easy to deform and has lower precision. The casing top does not have protector such as pre-buried waterstop, and mud, grit and concrete residue get into double casing intervallum and lead to double cannula malfunctioning in the work progress, and the double casing drill way is fixed improper easily and is sunk, and the work progress protection degree of difficulty is big, and the annular steel sheet is installed to the conventional double casing outside of tubes socle, can't take out reuse after the static load test is accomplished, and is seriously inconsistent with science and technology leading, green energy-conserving theory.
Disclosure of Invention
The invention provides a recyclable double-layer steel sleeve for a bored pile static load test and a processing, manufacturing and installing method thereof, aiming at solving the technical problems of difficult processing, manufacturing, installing and fixing, easy variability of inner and outer sleeves, easy failure after the sleeves are installed and high construction cost of the conventional bored pile double-sleeve method.
In order to achieve the purpose, the technical scheme of the invention is as follows: a recyclable double-layer steel sleeve for a bored pile static load test comprises a double sleeve and rubber water stops, wherein the rubber water stops are arranged at the top end and the bottom end of the double sleeve, and sealing materials are respectively arranged in the upper section and the lower section of the double sleeve and used for temporary filling; the inner sleeve and the outer sleeve at the top end of the double sleeve are welded with four special-shaped lifting lugs; and an auxiliary steel lifting lug is arranged at the position 2/3 downwards from the top of the double sleeve.
Furthermore, the double-sleeve pipe is formed by splicing two steel pipes with the wall thickness of 10mm, wherein the inner diameter of the inner sleeve pipe is 50mm larger than the pile diameter, the inner diameter of the outer sleeve pipe is 110mm larger than the inner diameter of the inner sleeve pipe, the width of a gap between the double-sleeve pipe is 45mm, the inner sleeve pipe on the top end of the double-sleeve pipe is 300mm longer than the outer sleeve pipe, and the inner sleeve pipe on the bottom end of the double-sleeve pipe is 500mm longer.
Furthermore, a first annular support rib is arranged 2m below the top end of the outer sleeve of the double-sleeve, flexible filling materials are adopted as temporary filling within the 2m range, a last annular support rib is arranged 2m above the bottom end of the outer sleeve of the double-sleeve, flexible filling materials are adopted as temporary filling within the 2m range, and the annular support ribs are uniformly distributed within the rest length of the double-sleeve at intervals not more than 5 m.
A recyclable method for processing, manufacturing and installing a double-layer steel sleeve for a bored pile static load test comprises the following steps:
1) selection of double-sleeve material
According to the sectional size form of the double-casing pipe required by design, the wall thickness of the selected steel pipe is 10mm, the material of the steel pipe is not lower than Q235B grade, and the length of the double-casing pipe is customized according to the actual situation according to different depths of the test pile hole drilling section of the bored pile. Conventional rubber waterstops are adopted at the top end and the bottom end of the double-sleeve, and sealing materials are arranged in the double-sleeve within a certain range for temporary filling; the inner sleeve and the outer sleeve at the top end of the double-sleeve are welded and connected by adopting 4 steel plates with the thickness of 20mm to manufacture special-shaped lifting lugs; the supplementary steel lug of 1 thickness 20mm of downward 2/3 position department installation in sleeve pipe top, this double cannula installation is accomplished the back, easily fixes, and can prevent that silt from getting into the double cannula pipe wall, ensures double cannula use accuracy.
2) Assembling and combining form of double sleeves
The double-sleeve is formed by splicing two steel pipe steel pipes with the wall thickness of 10mm, wherein the inner diameter of the inner sleeve is 50mm larger than the pile diameter, the inner diameter of the outer sleeve is 110mm larger than the inner diameter of the inner sleeve, the width of a gap between the double-sleeve is 45mm, the inner sleeve at the top end of the double-sleeve is 300mm longer than the outer sleeve, the inner sleeve at the bottom end of the double-sleeve is 500mm longer than the outer sleeve, four placing lifting points are symmetrically arranged at the top of the double-sleeve in a bidirectional mode, four inner and outer sleeve fixers are arranged at the bottom end of the double-sleeve, and an auxiliary steel lifting lug with; a first annular support rib is arranged 2m below the top end of the outer sleeve of the double-sleeve, flexible filling materials are adopted to temporarily fill the first annular support rib within 2m, a last annular support rib is arranged 2m above the bottom end of the outer sleeve of the double-sleeve), the last annular support rib is arranged within 2m, the flexible filling materials are adopted to temporarily fill the last annular support rib within 2m, and the annular support ribs in the rest length of the double-sleeve are uniformly distributed at intervals not more than 5 m; installing 45mm by 50mm rubber waterstops at the top and the bottom of the inner and outer sleeves, and sealing by adopting a sealant;
3) double-sleeve hoisting and mounting method
After the hole of the drilled pile is formed to the height mark of the bottom of the double-sleeve pipe, lifting and drilling to carry out hole forming detection, and lifting and mounting the sleeve pipe after the hole forming verticality needs to meet the requirement; the double-casing hoisting is realized by adopting a hoisting tool to hoist and mount in place at one time, a main hook and an auxiliary hook are adopted to hoist, a main hook is mounted to the top hoisting point of the double-casing, a spoke hook is mounted to an auxiliary hoisting point, and the bottom of the double-casing and the ground are used as supporting points to hoist and straighten; after the elevation is installed in place, temporarily welding and fixing a tube top placing point and a carrying pole, and checking the perpendicularity of the sleeve and the concentricity of the pile position center and the double sleeve center before fixing;
(4) protection measures after double-sleeve installation
After a bored pile forms a hole to the bottom of the designed double-sleeve, lifting the drill and lifting the double-sleeve, checking the sealing condition of rubber water stops at two ends of the top and the bottom of the double-sleeve and the welding quality of a placement point at the top of the double-sleeve before lifting the double-sleeve, and lifting the double-sleeve after the double-sleeve is qualified through on-site acceptance; the hoisting is straight and slow, the sleeve does not touch the cast-in-situ bored pile frame as much as possible, the four fixtures at the bottom of the sleeve are cut off after the double-sleeve is hoisted vertically, and the firmness condition of the rubber waterstop at the bottom of the sleeve is checked; after the double sleeves are installed to the designed elevation, the double sleeves are temporarily placed on the aperture shoulder pole beam without disassembling a hanger shackle, after the installation verticality of the double sleeves and the concentricity of the centers of the sleeves and the pile position meet the requirements, the placing points of the double sleeves and the shoulder pole beam are welded and fixed firmly, a lifting rigging is disassembled, and the peripheries of the double sleeves are backfilled and compacted by plain soil; the double sleeves are strictly protected from collision in the processes of continuously forming holes, installing a reinforcement cage and pouring concrete;
(5) the outer sleeve is dismantled after the static load test is finished
Four hanging point placing points at the top end of the double-sleeve are cut off before the static load test construction of the cast-in-place pile, no barriers such as silt and the like exist in the double-sleeve, the detection data accuracy is high, after the static load test of the cast-in-place pile is completed, the outer sleeve is taken out by adopting a double-sleeve outer side flushing method in combination with the hydraulic jacking frame and the tool pipe, and the inner sleeve is added after the outer sleeve is taken out and can be continuously used on a new cast-in-place pile static load test. .
Compared with the prior art, the invention adopts the novel double-casing pipe to carry out the static load test of the cast-in-place pile, and has the beneficial effects that: the method solves the technical problems that double sleeves are not easy to fix and deform, sundries such as silt and concrete fragments are easy to enter the gaps of the sleeves, the lifting is safe, the double sleeves can be recovered and the like, and has the advantages that the materials are not easy to deform and shift, silt and blockage are not easy to enter, the static load test detection data are high in accuracy and help designers, the double sleeves are easy to process and install, the pulling and recovery are simple and convenient, and the like. The method has a significant guiding effect on the stress design of the whole building structure, has an important reference value for detecting similar bored concrete pile static load test data, and has remarkable social and economic benefits.
Drawings
FIG. 1 is a schematic view of the double-casing integral process;
FIG. 2 is a schematic view of a dual casing landing/hang point (inner and outer casing top end retainers) tube top seal;
FIG. 3 is a cross-sectional view taken along A-A of FIG. 1;
FIG. 4 is a detailed view of the dual casing auxiliary hoist point configuration at B of FIG. 1;
FIG. 5 is a detail view of the double tube inner rib configuration at C of FIG. 1 (welded to the outer side of the inner tube);
FIG. 6 is a schematic view of the double-barreled rubber bottom water stop and the flexible filler material at D of FIG. 1;
FIG. 7 is a diagram of a double cannula top suspension point placement (anchor) and sealing effect;
FIG. 8 is an effect diagram of a double casing auxiliary hanging point;
figure 9 shows the effect of the double cannula bottom anchor and the inner cannula extending 500 mm.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings:
the invention takes the construction of double sleeves in the static load test of the cast-in-place pile as an example.
As shown in fig. 1 to 9, the method for processing, manufacturing and installing the recyclable bored pile dead load test double-layer steel sleeve comprises the following steps:
1) recyclable double-sleeve structure design
The length of the double casing pipes is customized according to different depths of the bored sections of the test piles of the cast-in-situ bored piles according to actual conditions. Rubber water stops are adopted at the top end and the bottom end of the double-sleeve, and sealing materials are arranged in the double-sleeve within a certain range for temporary filling; the inner sleeve and the outer sleeve at the top end of the double-sleeve are welded and connected by adopting 4 steel plates with the thickness of 20mm to manufacture special-shaped lifting lugs; the supplementary steel lug of 1 thickness 20mm of downward 2/3 position department installation in sleeve pipe top, this double cannula installation is accomplished the back, easily fixes, and can prevent that silt from getting into the double cannula pipe wall, ensures double cannula use accuracy.
2) Assembling and combining form of recyclable double-sleeve
This double cannula adopts two steel pipe steel pipes concatenation of 10mm of wall thickness to form, wherein interior sleeve pipe internal diameter is 50mm bigger than the stake footpath, the sleeve pipe internal diameter is 110mm bigger than interior sleeve pipe internal diameter in the outer tube internal diameter, gap width is 45mm between the double cannula, the sleeve pipe is longer 300mm than the outer tube in the double cannula top, sleeve pipe is longer 500mm than the outer tube in the double cannula bottom, 4 hoisting points (inside and outside sleeve pipe top fixer) are shelved to two-way symmetry installation in sleeve pipe top, 4 inside and outside sleeve pipe fixers are installed to double cannula bottom, 1 supplementary steel lug of thickness 20mm is installed to downward 2/3 position department in the sleeve pipe top. The first annular support rib is installed at the position 2m below the top end of the double-sleeve (outer sleeve), flexible filling materials are adopted for temporary filling in the 2m range, the last annular support rib is installed at the position 2m above the bottom end of the double-sleeve (outer sleeve), the flexible filling materials are adopted for temporary filling in the 2m range, and the annular support ribs in the rest lengths of the double-sleeve are uniformly distributed at intervals not larger than 5 m. And rubber waterstops of 45mm x 50mm are arranged at the top and the bottom of the inner and outer sleeves, and are sealed by adopting sealant.
3) Hoisting and mounting method of recyclable double-sleeve
After the drilled pile test pile is drilled to reach the elevation of the bottom of the double-sleeve pipe, the drilled pile is lifted and drilled to perform hole forming detection, and the sleeve pipe can be lifted and installed after the hole forming verticality needs to meet the requirements. The double-casing hoisting adopts a reasonable hoisting tool to hoist and mount in place at one time, adopts a main and auxiliary hook hoisting mode, a main hook is mounted to a casing top hoisting point, a spoke hook is mounted to an auxiliary hoisting point, and the bottom of the casing and the ground are used as supporting points to hoist and straighten. After the elevation is installed in place, the tube top placing points and the carrying poles are welded and fixed temporarily, and before fixing, the perpendicularity of the sleeve and the concentricity of the pile position center and the double sleeve center are checked.
4) Demolish recovery after outer tube static load test is accomplished
4 hoisting point shelving points (inner and outer sleeve top end fixers) at the top end of the double sleeve are cut off before the bored concrete pile static load test construction, and the inner pipe is free of obstacles such as silt, the accuracy of detection data is high, after the bored concrete pile static load test is completed, the outer sleeve is taken out by adopting a sleeve outer side flushing method, combining a hydraulic jacking frame and a tool pipe, and after the outer sleeve is taken out, the inner sleeve is added to continue to be used on a new bored concrete pile static load test pile, so that the economic benefit is good, and the long-term development significance is achieved.
The embodiment of the double-layer steel sleeve for the static load test of the recyclable cast-in-situ bored pile comprises the following steps:
as shown in fig. 1, according to the form of the double-casing interface required by design, a batch of inner casings 2 are customized and processed, wherein the inner diameter of each inner casing 2 is equal to the diameter of the pile plus 50mm, the wall thickness is 10mm, the inner diameter of each outer casing 1 is equal to the inner diameter of each inner casing 2 plus 110mm, and the length of each single steel pipe is set according to the distance of an excavation surface of the ground of the cast-in-place.
As shown in fig. 2 and 3, four lifting points and rest points 3 are arranged at the top opening of the outer sleeve 1, the lifting points and rest points 3 are welded with the inner sleeve and the outer sleeve on two sides by adopting a steel plate with the thickness of 20mm, and hf is 10 mm; the hoisting point is made by cutting a 200 x 300 steel plate, the diameter of the hoisting hole is 50mm, the radius of an upper side fillet is 75mm, the center distance of the hoisting hole is 135mm from the inner side of the steel plate and 40mm from the lower side of the steel plate, and foaming agents are filled in the range of 2m from the top of the pipe to the bottom of the pipe to 4, so that concrete and silt are prevented from entering the wall gap of the double-casing pipe. The first annular supporting rib 7 is installed at the position 2m below the top end of the outer sleeve of the double-sleeve pipe, flexible filling materials are adopted in the 2m range to serve as temporary filling, the last annular supporting rib 7 is installed at the position 2m above the bottom end of the outer sleeve 1 of the double-sleeve pipe, the flexible filling materials are adopted in the 2m range to serve as temporary filling, and the annular supporting ribs 7 are evenly distributed in the rest length of the double-sleeve pipe at intervals not larger than 5 m.
As shown in fig. 4, an auxiliary lifting point 5 is arranged at a position 2L/3 below the top of the double-casing pipe, and the total length of the L double-casing pipe is the same straight line with one of the four lifting points and the rest points for the central axis of the auxiliary lifting point; the auxiliary hoisting point 5 is cut by a steel plate with the thickness of 20mm, the diameter of a hoisting hole is 40mm, two sides of the auxiliary hoisting point 5 must be fully welded with the steel plate, and the height hf of a welding line is 10 mm.
As shown in fig. 5, all the rib plates of the double-sleeve pipe must be fully welded with the upper layer and the lower layer of the inner sleeve pipe, hf is 10mm, the rib plates are cut into rings by a 12mm thick steel plate, the outer sides of the cut rib plates should be polished to be flat, burrs are prevented from influencing the sliding of the outer sleeve pipe, the clear distance between the rib plates and the inner wall of the outer sleeve pipe is controlled within 5mm, and the inner sleeve pipe and the outer sleeve pipe can slide freely.
As shown in fig. 6, the bottom of the outer sleeve is plugged by a rubber waterstop 6 with 45mm x 50mm, relevant measures are adopted in the processing process to ensure that the annular waterstop does not fall off, and a layer of sealant 8 is coated on the contact surface of the waterstop and the sleeve after the processing is finished. The flexible material is filled in the range of 2m from the bottom of the double casing, so that mud, concrete and the like are prevented from entering.
As shown in fig. 7, 8 and 9, the node effect diagram is obtained after the double-sleeve processing is completed.
Claims (4)
1. The utility model provides a but cyclic utilization's bored concrete pile static load test double-deck steel casing pipe, includes double cannula, rubber waterstop, its characterized in that: rubber water stops are arranged at the top end and the bottom end of the double-sleeve, and sealing materials are arranged in the upper and lower sections of the double-sleeve for temporary filling; the inner sleeve and the outer sleeve at the top end of the double sleeve are welded with four special-shaped lifting lugs; and an auxiliary steel lifting lug is arranged at the position 2/3 downwards from the top of the double sleeve.
2. The recyclable bored pile dead load test double-layer steel sleeve according to claim 1, characterized in that: the double cannula adopts two steel pipes of wall thickness 10mm to splice and forms, and wherein interior sheathed tube internal diameter is 50mm bigger than the stake footpath, and the internal diameter of outer tube is 110mm bigger than interior sleeve pipe internal diameter, and the gap width is 45mm between the double cannula, and the sleeve pipe is longer 300mm than the outer tube in double cannula top, and the sleeve pipe is longer 500mm than the outer tube in double cannula bottom.
3. The recyclable bored pile dead load test double-layer steel sleeve according to claim 1, characterized in that: the top end of the outer sleeve of the double-sleeve is provided with a first annular supporting rib 2m downward, flexible filling materials are adopted in the range of 2m to serve as temporary filling, the bottom end of the outer sleeve of the double-sleeve is provided with a last annular supporting rib 2m upward, the range of 2m is provided with the flexible filling materials to serve as temporary filling, and the annular supporting ribs are uniformly distributed in the rest length of the double-sleeve at intervals not larger than 5 m.
4. The method for processing, manufacturing and installing the recyclable double-layer steel sleeve for the bored pile static load test according to claim 1, is characterized by comprising the following steps of:
1) selection of double-sleeve material
According to the sectional size form of the double-casing pipe required by design, the wall thickness of the selected steel pipe is 10mm, the material of the steel pipe is not lower than Q235B grade, and the length of the double-casing pipe is customized according to the actual situation according to different depths of the test pile hole drilling section of the bored pile. Conventional rubber waterstops are adopted at the top end and the bottom end of the double-sleeve, and sealing materials are arranged in the double-sleeve within a certain range for temporary filling; the inner sleeve and the outer sleeve at the top end of the double-sleeve are welded and connected by adopting 4 steel plates with the thickness of 20mm to manufacture special-shaped lifting lugs; the supplementary steel lug of 1 thickness 20mm of downward 2/3 position department installation in sleeve pipe top, this double cannula installation is accomplished the back, easily fixes, and can prevent that silt from getting into the double cannula pipe wall, ensures double cannula use accuracy.
2) Assembling and combining form of double sleeves
The double-sleeve is formed by splicing two steel pipe steel pipes with the wall thickness of 10mm, wherein the inner diameter of the inner sleeve is 50mm larger than the pile diameter, the inner diameter of the outer sleeve is 110mm larger than the inner diameter of the inner sleeve, the width of a gap between the double-sleeve is 45mm, the inner sleeve at the top end of the double-sleeve is 300mm longer than the outer sleeve, the inner sleeve at the bottom end of the double-sleeve is 500mm longer than the outer sleeve, four placing lifting points are symmetrically arranged at the top of the double-sleeve in a bidirectional mode, four inner and outer sleeve fixers are arranged at the bottom end of the double-sleeve, and an auxiliary steel lifting lug with; a first annular support rib is arranged 2m below the top end of the outer sleeve of the double-sleeve, flexible filling materials are adopted to temporarily fill the first annular support rib within 2m, a last annular support rib is arranged 2m above the bottom end of the outer sleeve of the double-sleeve), the last annular support rib is arranged within 2m, the flexible filling materials are adopted to temporarily fill the last annular support rib within 2m, and the annular support ribs in the rest length of the double-sleeve are uniformly distributed at intervals not more than 5 m; installing 45mm by 50mm rubber waterstops at the top and the bottom of the inner and outer sleeves, and sealing by adopting a sealant;
3) double-sleeve hoisting and mounting method
After the hole of the drilled pile is formed to the height mark of the bottom of the double-sleeve pipe, lifting and drilling to carry out hole forming detection, and lifting and mounting the sleeve pipe after the hole forming verticality needs to meet the requirement; the double-casing hoisting is realized by adopting a hoisting tool to hoist and mount in place at one time, a main hook and an auxiliary hook are adopted to hoist, a main hook is mounted to the top hoisting point of the double-casing, a spoke hook is mounted to an auxiliary hoisting point, and the bottom of the double-casing and the ground are used as supporting points to hoist and straighten; after the elevation is installed in place, temporarily welding and fixing a tube top placing point and a carrying pole, and checking the perpendicularity of the sleeve and the concentricity of the pile position center and the double sleeve center before fixing;
(4) protection measures after double-sleeve installation
After a bored pile forms a hole to the bottom of the designed double-sleeve, lifting the drill and lifting the double-sleeve, checking the sealing condition of rubber water stops at two ends of the top and the bottom of the double-sleeve and the welding quality of a placement point at the top of the double-sleeve before lifting the double-sleeve, and lifting the double-sleeve after the double-sleeve is qualified through on-site acceptance; the hoisting is straight and slow, the sleeve does not touch the cast-in-situ bored pile frame as much as possible, the four fixtures at the bottom of the sleeve are cut off after the double-sleeve is hoisted vertically, and the firmness condition of the rubber waterstop at the bottom of the sleeve is checked; after the double sleeves are installed to the designed elevation, the double sleeves are temporarily placed on the aperture shoulder pole beam without disassembling a hanger shackle, after the installation verticality of the double sleeves and the concentricity of the centers of the sleeves and the pile position meet the requirements, the placing points of the double sleeves and the shoulder pole beam are welded and fixed firmly, a lifting rigging is disassembled, and the peripheries of the double sleeves are backfilled and compacted by plain soil; the double sleeves are strictly protected from collision in the processes of continuously forming holes, installing a reinforcement cage and pouring concrete;
(5) the outer sleeve is dismantled after the static load test is finished
Four hanging point placing points at the top end of the double-sleeve are cut off before the static load test construction of the cast-in-place pile, no barriers such as silt and the like exist in the double-sleeve, the detection data accuracy is high, after the static load test of the cast-in-place pile is completed, the outer sleeve is taken out by adopting a double-sleeve outer side flushing method in combination with the hydraulic jacking frame and the tool pipe, and the inner sleeve is added after the outer sleeve is taken out and can be continuously used on a new cast-in-place pile static load test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011394071.6A CN112609752A (en) | 2020-12-03 | 2020-12-03 | Recyclable double-layer steel sleeve for bored pile static load test and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011394071.6A CN112609752A (en) | 2020-12-03 | 2020-12-03 | Recyclable double-layer steel sleeve for bored pile static load test and method |
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2020
- 2020-12-03 CN CN202011394071.6A patent/CN112609752A/en active Pending
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| CN101545270A (en) * | 2009-04-17 | 2009-09-30 | 上海隧道工程股份有限公司 | Double sleeve for pile foundation test and construction technique thereof |
| CN202925543U (en) * | 2012-10-26 | 2013-05-08 | 武汉武建机械施工有限公司 | Concentric steel-made double sleeve pipe |
| CN106948390A (en) * | 2017-05-24 | 2017-07-14 | 深圳宏业基岩土科技股份有限公司 | The double casing structures detected for test pile |
| CN107574846A (en) * | 2017-10-18 | 2018-01-12 | 华北水利水电大学 | Permanent bearing capacity of pile foundation dead-load detection sleeve below a kind of foundation ditch bottom |
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Application publication date: 20210406 |