CN110512597A - A kind of rotary digging cast-in-place pile construction method - Google Patents
A kind of rotary digging cast-in-place pile construction method Download PDFInfo
- Publication number
- CN110512597A CN110512597A CN201910684872.7A CN201910684872A CN110512597A CN 110512597 A CN110512597 A CN 110512597A CN 201910684872 A CN201910684872 A CN 201910684872A CN 110512597 A CN110512597 A CN 110512597A
- Authority
- CN
- China
- Prior art keywords
- rotary digging
- construction method
- place pile
- construction
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- 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
Abstract
The invention discloses a kind of rotary digging cast-in-place pile construction methods, are related to the technical field of filling pile construction, the main points of its technical scheme are that: temporary road is set in preparation is used to put the raw material and equipment that construction is used.The present invention solves raw material or equipment supply is easy to appear insufficient technical problem, has the advantages that raw material can be allowed sufficient.
Description
Technical field
The present invention relates to the technical field of filling pile construction, in particular to a kind of rotary digging cast-in-place pile construction method.
Background technique
Bored concrete pile is a kind of pore-forming in place, concrete perfusion or armored concrete and manufactured stake.
Application No. is the Chinese patents of 201710969003.X to disclose a kind of construction method of rotary digging bored concrete pile, passes through rotation
Bored concrete pile is perfused the method for digging perfusion completes.
The shortcomings of the prior art is: needing to equipment needed for constructing and applies in preparation of construction work
The supply of work material requested duration, is not easy material supply to meet supply requirement by the transport of duration, if road is stifled
Vehicle is then possible to insufficient, influences the duration.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to: a kind of rotary digging cast-in-place pile construction method is provided, is had
There is ... advantage.
Above-mentioned technical purpose is achieved through the following technical solutions, a kind of rotary digging cast-in-place pile construction method, including as follows
Step:
Step 1: preparation of construction works；
Step 2: surveying setting-out；
Step 3: excavating stake holes；
Step 4: embedded casing；
Step 5: production mud off；
Step 6: borehole cleaning；
Step 7: making and launching steel reinforcement cage；
Step 8: subaqueous concreting,
Preparation of construction work includes the earth's surface on compacting ground to be onstructed and side opens up temporary construction road on construction ground, will construct
The equipment and/or raw material used are placed on temporary construction road.
Through the above technical solutions, temporarily being applied by that can be placed on to equipment and raw material provided with temporary construction road
On work road, in raw material duration for seasonable, the storage and preparation of raw material can be carried out by temporary road, is less prone to material
Insufficient situation.
Further, the work step of the surveying setting-out are as follows: draw a circle to approve construction site and measured after carrying out place range
And bracing wire, by setting flag on scheduled stake position, and set the position of piling, pile driving position finished into mark line.
Through the above technical solutions, setting the position of piling after place is drawn a circle to approve, mark, carries out base for subsequent piling
Plinth.
Further, the measurement method of surveying setting-out are as follows: according to orientation, the direction of general layout network point combination building
Basic point is made, with longitude and latitude measurement and positioning, measures plane and standard width of a room in an old-style house size with steel ruler.
Through the above technical solutions, measuring by longitude and latitude, city's roads can be allowed more accurate.
Further, the construction content for finishing mark line includes: drafting axis, and main shaft point of intersection starts, and measures each axis
Theodolite is finally moved on to angle steel joint and checked by line, and the control of building square grid uses axis method, and axis is parallel to building
At least three anchor point is arranged on place center, long axis in setting.
Through the above technical solutions, being drawn lines by axis method, setting-out can be allowed more accurate, pass through three or more
Anchor point, which carries out positioning, can be improved the precision of setting-out, reduce position error.
Further, the step of excavating stake holes are as follows: 1, advance drilling construction；2, test pile；3, pore-forming.
Through the above technical solutions, completing to excavate stake holes by three steps.
Further, in the step of borehole cleaning by grout hole tripping in steel conduit carry out extraction mud, the steel conduit
Tripping in grout hole one end is fixedly connected with high-pressure rubber pipe, offers pore on the high-pressure rubber pipe.
Through the above technical solutions, mud extraction can be realized cleaning to stake holes by steel conduit, allow stake holes more
Cleaning.
Further, borehole cleaning includes a borehole cleaning and secondary pile hole cleaning, is carried out after detection sediment is thicker after a borehole cleaning
Secondary pile hole cleaning, without carrying out secondary pile hole cleaning if sediment is relatively few.
Through the above technical solutions, the detection after borehole cleaning and borehole cleaning can allow the sediment in that stake holes less twice.
Further, the specific steps of mud off are made are as follows: setting pulp storage tank and two sedimentation basins, two sedimentation basins
Inlet and outlet be provided with valve, pulled water out after sedimentation basin precipitates, using another sedimentation basin, first
A sedimentation basin carries out cleaning work.
Through the above technical solutions, mud can be stored by pulp storage tank by two sedimentation basins and a pulp storage tank,
Be used alternatingly by two sedimentation basins, opened when needing to clear up after a use an another sedimentation basin carry out using,
It is easy to operate, construction efficiency is improved, and then shorten the construction period.
Further, the step of subaqueous concreting are as follows: 1, steel conduit examination spelling；2, steel conduit is called in grout hole；
3, add in the nozzle of steel conduit and fill high pressure water；4, the thickness of sediment in fill orifice is checked；5, steel conduit is inserted into grout hole, Xiang Gang
Part concrete is injected in conduit, re-injects mixed mud after being lifted up steel conduit, until grout hole is filled concrete.
Through the above technical solutions, by that pouring for concrete can be allowed more equal from the upward penetration concrete in stake holes bottom
It is even.
Further, the concrete that it is C30 that concrete, which is selected, in the present embodiment.
Through the above technical solutions, the concrete strength of C30 is higher, the intensity of bored concrete pile is improved.
The present invention has following technical effect that in summary
1, equipment and raw material can be placed on temporary construction road by being provided with temporary construction road, is continued in raw material
Property for seasonable, the case where the storage and preparation of raw material can be carried out by temporary road, is less prone to scant supply of materials；
2, it is measured by longitude and latitude, city's roads can be allowed more accurate；
3, it is drawn lines by axis method, setting-out can be allowed more accurate, carrying out positioning by three or more anchor points can
The precision of setting-out is improved, position error is reduced.
Detailed description of the invention
Fig. 1 is the flow chart of embodiment 1.
Specific embodiment
A kind of embodiment 1, rotary digging cast-in-place pile construction method, includes the following steps:
Referring to Fig.1, the first step, preparation of construction work, preparation of construction work in the present embodiment are as follows: by construction site clear up it is smooth after
Construction site is compacted, and construction field two sides are provided with temporary construction road, equipment, raw material that construction is used etc. are placed
On temporary construction road.
Second step, surveying setting-out, surveying setting-out in the present embodiment are as follows: the range of construction site is done in delineation construction site
Good measurement and bracing wire by setting flag on scheduled stake position, and set the position for needing to drive piles, mark will be finished in pile driving position
Remember line.
The measurement of building makes base according to orientation, the direction of general layout network point combination building in the present embodiment
Point, is positioned with transit survey, measures plane and standard width of a room in an old-style house size with steel ruler.Measurement is by main shaft point of intersection, each axis is measured
Line, finally by theodolite move on to angle steel joint carry out check closure it is errorless.
Axis is extended on axis stake and portal frame outside building after overall dimension and the review of standard width of a room in an old-style house size are accurate,
Axis stake, portal frame and the building that outrigger shaft line index mark is drawn should be secured, stable, reliable and convenient for monitoring.
When place is less than one square kilometre or when general building area, establishes be equivalent to second level Traverse Accuracy as needed
Horizontal control network, and then improve precision scribing line precision.
The control of building square grid uses axis method, and axis is parallel to building setting and sets on place center, long axis
4 anchor points are set to improve precision.
Third step excavates stake holes, and in the present embodiment, excavating stake holes and selecting is advance drilling construction method.
Pile foundation uses spiral-digging pore bored concrete pile foundation, and it is end-bearing friction pile stake that stake diameter D, which is 600 ~ 1400 meters and waits 5 kinds, with
For weathered mudstone layer as bearing course at pile end, pile concrete uses C30, and stake end enters weathered mudstone layer depth not less than 1.00
Rice.Each stake diameter effective length: Φ 600 are not less than 6m, and Φ 800 are not less than 7m, and 1000 ~ Φ of Φ 1400 are not less than 8m.It is mixed
Solidifying soil strength grade is C30.Vertical muscle diameter is Φ 18 or Φ 20, and putting more energy into and binding round diameter is 12 ~ Φ of Φ 18, spiral hoop diameter be Φ 8 ~
Φ10.Stake is a length of 17 ~ 41 meters net.Vertical bearing capacity of single pile characteristic value: Φ 600 2400KN, Φ 800 4000KN, Φ 1000
Stake 1200 9000KN of 6000KN, Φ, whole project about 21616m, engineering pile rotary pile-digging machine is using SR280 rotary pile-digging machine.
The step of excavating drilling are as follows: 1, advance drilling construction, in the present embodiment, engineering pile uses advance drilling before construction, presses
According to the adjacent Hole cross-section plotting of geologic report as drilling depth foundation, the soil sample rock sample of extraction is successively set and taken pictures, with modeling
Material bag is contained, and is determined by geomatics engineer in field according to soil sample rock sample and build-in design requirement and is received stake foundation, and is recorded as sampling
Table.
2, test pile.
Test pile is perfusion test pile, specific steps are as follows: pours inner concrete and then is conserved, is carried out after reaching age
Core pulling detection, the specific works of core pulling detection are to learn the test according to the situation of core sample by extracting core sample after drill hole of drilling machine
Pile integrity, 3 test piles of perfusion are used to shorten error in the present embodiment.
3, pore-forming.
Unwrapping wire fixed pile after levelling of the land will squeeze into the steel of a 16 × 800mm of φ in each position central point after positioning
Muscle does stake position label, and draws stake position or axial line control point to the place for being not easy to disturb, and the reinforcing bar for squeezing into 25 × l000mm of φ is done
Label, and fixed with concrete, stake position is checked when to construct.Vertical control point is set up simultaneously.To axis, stake after unwrapping wire
Position, vertical control point are checked.
4th step buries casing.
Casing can be processed into for the steel plate of 4-6mm thickness, casing with a thickness of 5mm, the height of casing in the present embodiment
Can be 1.5-2m, the height of casing is 1.8m in the present embodiment, and the diameter of casing is greater than the diameter of drill bit, and casing inner wall with
It is provided between drill bit outer wall and is reserved with fit clearance, the diameter of casing is 200mm bigger than the diameter of drill bit, offers at the top of casing
0.2m above ground level overflow slurry mouth, by shield-tube embedment in hole 1.5m.
The internal diameter of casing is greater than the stake diameter of bored concrete pile, and the internal diameter of casing is 200mm bigger than the diameter of drill bit, and casing is put into
One layer of clay is inserted after in hole, is being inserted next layer of clay after then being tamped and is being tamped, until gap is filled up.
5th step makes mud off.
It plans and calculates mud aequum；
Pulp storage tank is set, and for storing mud, the volume of pulp storage tank is 6 cubic metres, and it is 10 cubic metres heavy that two volumes, which are arranged,
The inlet and outlet in shallow lake pond, two sedimentation basins is provided with valve, closes the valve of one of sedimentation basin, and it is heavy to open another
The valve in shallow lake pond allows a sedimentation basin to carry out precipitating work into slurry, another sedimentation basin closes valve and carries out cleaning work, can
Two sedimentation basins are allowed to be used alternatingly.
Setting connection is in the annular mud ditch of pulp storage tank on construction ground, and setting several connections in place centre are on mud ditch
Branch slot, mud can be allowed to be circulated in mud ditch, mud during piling can say mud ditch flow into
In pulp storage tank, sedimentation basin is flowed by pulp storage tank, precipitating is carried out after precipitating, the water on upper layer is pumped into grout hole, shape
At mud recirculating network.
In the present embodiment, brick masonry is used on the side wall of sedimentation basin, pulp storage tank and mud ditch.
6th step, borehole cleaning.
The special epimerite of high-pressure rubber pipe insert port, steel conduit lower part are installed at the top of tripping in steel conduit in grout hole
Open and be plugged with high-pressure rubber pipe, offer pore on high-pressure rubber pipe side wall, high-pressure rubber pipe is connected with air compressor machine, open air compressor machine into
Reverse circulation cutting cleaning is lifted in promoting the circulation of qi.
When putting in blast, first into hole for the clean mud of specific gravity 1.05.When stopping borehole cleaning, disconnected mud after gas is first closed, with
Prevent head loss from causing the hole that collapses.From small to large, wind pressure is slightly larger than bottom hole head pressure to air output；When bottom hole sediment is thicker, block
It spends larger, or when precipitating is hardened, increases air output and shake the outlet pipe of air compressor machine, deslagging speed can be accelerated.With flushing cinder
Discharge, bottom hole sediment reduce, complete a borehole cleaning.
The thickness for detecting the sediment of bottom in grout hole, carries out secondary pile hole cleaning if sediment thickness is more.
7th step, makes steel reinforcement cage, steel reinforcement cage include it is multiple be arranged in parallel main reinforcement, multiple main reinforcements are encircled a city rectangular space, main
The stirrup being trapped among in main reinforcement is vertically fixedly connected on muscle.
The distance between two main reinforcements are the diameter of 35 times of main reinforcements.
8th step, subaqueous concreting:
1, steel conduit is subjected to examination spelling, determines that interface is tightly secured, check it is assembled after vertical case, amount stake holes overall length with
The assembled length of steel conduit, whose leakproofness after detection examination spelling；
2, steel conduit is turned in grout hole；
3, it will add in the nozzle of steel conduit and fill high pressure water, the sediment for being deposited in bottom hole is made to drift about；
4, the thickness for checking sediment in grout hole, if after sediment to lower than penetration concrete after carrying out if 50mm；
5, after steel conduit being inserted into grout hole, the distance of steel conduit distance from bottom bottom hole is 400mm, primary to steel conduit bottom end
It is embedded to the concrete of 1m high, when concrete rises to steel reinforcement cage lower end, to prevent steel reinforcement cage from being held up by concrete, in grout hole
Steel reinforcement cage upper end is fixed with hangs muscle in aperture；
6, after grout hole inner concrete enters 1 ~ 2m of steel reinforcement cage, it is diluted with water while is lifted up steel conduit, is extracted out with slush pump
Partly precipitated object reduces influence of the sediment to grouting works, is lifted up pipeline while placing concrete；
It is 3m that the tube bottom of steel conduit, which is embedded in the depth in concrete, first moves top upper hopper away when promoting steel conduit, then hangs down
It is straight to promote steel conduit, funnel is connected again after removing the upper section in top, continues concrete perfusion.Promoting steel conduit will keep steel conduit to hang down
It is straight and placed in the middle, do not make to tilt and affect framework of steel reinforcement；
7, the detection of wellhole inner concrete face position is detected using the taper sounding bob for hammering weight 6kg into shape.On filling concrete to stake top
When within portion 5m, steel conduit is no longer promoted, once promotes steel conduit wait be perfused to regulation absolute altitude, tube drawing refers to anti-plug using slow.
When having the short time to rest in filling process, interval starts steel conduit, and concrete is made to keep enough mobility.
9th step, pile measurement,
After pile foundation construction, pile measurement is carried out by design and code requirement, for stake under the column of stake diameter < 1500mm and non-
Stake under column, Ying Caiyong core drilling method or sound wave transmission method sampling observation, sampling observation quantity be the 35% of corresponding stake sum and；To what is do not inspected by random samples
Remaining stake is detected using low strain dynamic method or Large strain method, uses static load test: sampling observation quantity is unit engineering pile sum
1.2%, when construction unit stake sum is when within 50, sampling observation quantity is 3.
Concrete selects the concrete of intensity model C30, and the slump is 180~220mm；Cement consumption is not less than
360kg/m3, the slump is 200mm in the present embodiment, and cement consumption is 400 kg/m3.
The sand factor of underwater concrete is preferably 40%~45%, is 43% in the present embodiment, selects medium coarse sand；Coarse aggregate is most
Big partial size < 40mm, the present embodiment select the coarse aggregate of 38mm diameter, and cobble or rubble, elder generation in the present embodiment can be selected in coarse aggregate
With for cobble.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. a kind of rotary digging cast-in-place pile construction method, characterized by the following steps:
Step 1: preparation of construction works；
Step 2: surveying setting-out；
Step 3: excavating stake holes；
Step 4: embedded casing；
Step 5: production mud off；
Step 6: borehole cleaning；
Step 7: making and launching steel reinforcement cage；
Step 8: subaqueous concreting,
It is characterized by: preparation of construction work includes the earth's surface on compacting ground to be onstructed and side opens up temporary construction on construction ground
Equipment and/or raw material that construction is used are placed on temporary construction road by road.
2. a kind of rotary digging cast-in-place pile construction method according to claim 1, it is characterised in that: the work of the surveying setting-out
Step are as follows: draw a circle to approve construction site and measure simultaneously bracing wire after carrying out place range, by setting flag on scheduled stake position, and set
Pile driving position is finished mark line by the position driven piles well.
3. a kind of rotary digging cast-in-place pile construction method according to claim 2, it is characterised in that: the measurement method of surveying setting-out
Are as follows: according to the orientation of general layout network point combination building, towards making basic point, with longitude and latitude measurement and positioning, with steel ruler zhang
Measure plane and standard width of a room in an old-style house size.
4. a kind of rotary digging cast-in-place pile construction method according to claim 2 or 3, it is characterised in that: finish applying for mark line
Work content includes: drafting axis, and main shaft point of intersection starts, and measures each axis, and theodolite is finally moved on to angle steel joint and carries out school
Core, the control of building square grid use axis method, and axis is parallel to building setting and is arranged at least on place center, long axis
3 anchor points.
5. a kind of rotary digging cast-in-place pile construction method according to claim 1 to 3, it is characterised in that: excavate stake holes
The step of are as follows: 1, advance drilling construction；2, test pile；3, pore-forming.
6. a kind of rotary digging cast-in-place pile construction method according to claim 1 to 3, it is characterised in that: the step of borehole cleaning
In rapid by grout hole tripping in steel conduit carry out extraction mud, described steel conduit tripping in grout hole one end is fixedly connected with height
Moulding pipe offers pore on the high-pressure rubber pipe.
7. a kind of rotary digging cast-in-place pile construction method according to claim 6, it is characterised in that: borehole cleaning include borehole cleaning with
And secondary pile hole cleaning, detect after borehole cleaning sediment it is thicker after carry out secondary pile hole cleaning, it is secondary without carrying out if sediment is relatively few
Borehole cleaning.
8. a kind of rotary digging cast-in-place pile construction method according to claim 1 to 3, it is characterised in that: production mud
The specific steps of retaining wall are as follows: setting pulp storage tank and two sedimentation basins, the inlet and outlet of two sedimentation basins are provided with valve,
It is pulled water out after a sedimentation basin precipitates, using another sedimentation basin, first sedimentation basin carries out cleaning work.
9. a kind of rotary digging cast-in-place pile construction method according to claim 1 to 3, it is characterised in that: underwater grouting
The step of concrete are as follows: 1, steel conduit examination spelling；2, steel conduit is called in grout hole；3, add in the nozzle of steel conduit and fill high pressure
Water；4, the thickness of sediment in fill orifice is checked；5, steel conduit is inserted into grout hole, part concrete is injected into steel conduit, upwards
Mixed mud is re-injected after promoting steel conduit, until grout hole is filled concrete.
10. a kind of rotary digging cast-in-place pile construction method according to claim 9, it is characterised in that: concrete in the present embodiment
Select the concrete for being C30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910684872.7A CN110512597A (en) | 2019-07-26 | 2019-07-26 | A kind of rotary digging cast-in-place pile construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910684872.7A CN110512597A (en) | 2019-07-26 | 2019-07-26 | A kind of rotary digging cast-in-place pile construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110512597A true CN110512597A (en) | 2019-11-29 |
Family
ID=68623636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910684872.7A Pending CN110512597A (en) | 2019-07-26 | 2019-07-26 | A kind of rotary digging cast-in-place pile construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110512597A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615001A (en) * | 2013-11-27 | 2014-03-05 | 宁波盛宏建设工程有限公司 | Bored pile construction method for reinforcing cage framework layered installation |
| CN106400782A (en) * | 2016-06-28 | 2017-02-15 | 中铁隧道集团二处有限公司 | Construction method for construction of foundation pit support bored secant pile walls with rotary drilling rig |
-
2019
- 2019-07-26 CN CN201910684872.7A patent/CN110512597A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615001A (en) * | 2013-11-27 | 2014-03-05 | 宁波盛宏建设工程有限公司 | Bored pile construction method for reinforcing cage framework layered installation |
| CN106400782A (en) * | 2016-06-28 | 2017-02-15 | 中铁隧道集团二处有限公司 | Construction method for construction of foundation pit support bored secant pile walls with rotary drilling rig |
Non-Patent Citations (2)
| Title |
|---|
| 杜贵成: "《土石方及桩基础工程计价应用与实例》", 31 January 2015, 金盾出版社 * |
| 陈安英等: "《土木工程专业课程设计》", 29 February 2012, 冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104631470B (en) | The large particle diameter sand gravel of high water level geology deep basal pit combination supporting construction method | |
| CN106284313B (en) | Long spire based on circulating mud retaining wall is squeezed into rock filling pile construction method | |
| CN203846485U (en) | Long pile percussion drill hole forming construction device | |
| CN106400782B (en) | A kind of construction method for going along with sb. to guard him hole-drilling interlocking pile using rotary drilling rig construction foundation pit | |
| CN105239563A (en) | Dry-method hole forming filling pile structure for post-grouting matched rotary drilling rig and construction method | |
| CN110106868B (en) | Karst geology large-diameter pile foundation pore-forming process method | |
| CN105275381A (en) | Drilling construction method for water-rich cobble stratum by utilizing impact drill | |
| CN109488202A (en) | A kind of gravel rock stratum pile foundation drilling construction engineering method containing gravel-boulder bed | |
| CN112482347B (en) | Construction method of soft soil treatment reinforcing layer and soft soil treatment reinforcing layer | |
| CN107246007A (en) | A kind of construction method CFG | |
| CN110644363A (en) | Construction method of underwater main tower of cross-river cable-stayed bridge of high-speed railway | |
| CN113089652A (en) | Occlusive pile construction method and reinforced structure | |
| CN110952586A (en) | Construction process for bearing platform below expressway | |
| CN112144559A (en) | Well construction method in high water-rich loess sandy gravel stratum transformer tube well | |
| CN106284311B (en) | A kind of dry efficient construction technology of pore-forming cast-in-place concrete pile of rotary drilling rig | |
| CN110145232A (en) | A kind of construction method for not mending slurry churning driven borehole | |
| CN204112318U (en) | A kind of technique device improving CFG guncreting pile bearing capacity | |
| CN113417215A (en) | Bridge construction method | |
| CN110924401A (en) | Construction foundation pit supporting mode for combined arching and bearing of mixing piles and cast-in-place piles | |
| CN110714459A (en) | Construction method of cast-in-situ bored pile | |
| CN110512597A (en) | A kind of rotary digging cast-in-place pile construction method | |
| CN108035357A (en) | Filling pile construction scheme and its funnel | |
| CN113404042A (en) | Bridge pile position construction method | |
| CN115233658B (en) | Construction method of dry-operation bottom-enlarging bored pile | |
| CN115045262B (en) | Karst landform Gao Tianfu foundation pile foundation construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191129 |