CN108729457A - A kind of steel pipe pile cofferdam and its construction method for bridge deepwater foundation - Google Patents
A kind of steel pipe pile cofferdam and its construction method for bridge deepwater foundation Download PDFInfo
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- CN108729457A CN108729457A CN201810673613.XA CN201810673613A CN108729457A CN 108729457 A CN108729457 A CN 108729457A CN 201810673613 A CN201810673613 A CN 201810673613A CN 108729457 A CN108729457 A CN 108729457A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000010276 construction Methods 0.000 title claims abstract description 27
- 239000004567 concrete Substances 0.000 claims abstract description 40
- 239000011435 rock Substances 0.000 claims abstract description 25
- 230000002787 reinforcement Effects 0.000 claims abstract description 12
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000003818 cinder Substances 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 6
- 239000003351 stiffener Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 230000037452 priming Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 3
- 244000273618 Sphenoclea zeylanica Species 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- -1 lock steel-pipe pile Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003466 welding Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Revetment (AREA)
Abstract
A kind of steel pipe pile cofferdam for bridge deepwater foundation is related to cofferdam construction technical field, including bottom concrete, lock steel-pipe pile, reinforced concrete pile, the pile foundation for going deep into basement rock is equipped with below bottom concrete；Lock steel-pipe pile includes pile body and the lock set on pile body wall surface, and lock steel-pipe pile is surrounded on the edge of bottom concrete by the connection of lock, and pile body lower end is integrally extended with the pile crown for going deep into surface of bedrock；Inner support is additionally provided in lock steel-pipe pile, inner support includes the supporting rod between H profile steel purlin and the horizontal lock steel-pipe pile for being set to offside；For concrete-pile by being extended downward into inside basement rock in lock steel-pipe pile, reinforced concrete pile includes concrete substrate and the steel reinforcement cage in concrete substrate.The present invention also provides a kind of construction methods for building the steel pipe pile cofferdam of bridge deepwater foundation.The present invention has the advantages that simple for process, easy for construction, at low cost, high safety, support performance are good, is suitable for complicated condition of river floor.
Description
Technical field
The present invention relates to cofferdam construction technical fields more particularly to a kind of steel-pipe pile for bridge deepwater foundation to enclose
Weir and its construction method.
Background technology
In the part rivers in China, especially such as Ganjiang River, geology, hydrologic condition complexity are different, and riverbed is mostly exposed
Basement rock, crouch under 15 meters of cushion caps of clear distance parallel with existing Beijing-Kowloon Railway Line in riverbed exposed bedrock, without the mud etc. in tradition riverbed
Carry out the rear construction in place in order to which steel-pipe pile sinks of the Auxiliary support of pile sinking.During bridge construction, using traditional double wall steel
If cofferdam is constructed, exist close on it is both wired lead to insufficient space, while exposed bedrock causes general cofferdam that can not sink
In place, steel-pipe pile can not ensure embedded depth and overall stiffness.And according to long Larsen steel sheet pile, intensity and tooth mouth close water without
Method reaches construction demand.Tall and big machinery is inconvenient to use in the construction process simultaneously.
Invention content
The purpose of the present invention is to provide a kind of steel pipe pile cofferdams and its construction method for bridge deepwater foundation, thus
The above technical barrier is solved, steel-pipe pile processing and fabricating is simple, quick, and material is purchased quickly, and negative and positive lock processing technology is simple,
Workload is few, processing site is of less demanding；Steel-pipe pile is using vibration hammer by root inserting piling, and Spiral digging machine is consolidated by root pilot hole, to solve
The problem of certainly exposed bedrock is difficult to construct, working procedure is succinct, mechanized construction, at low cost, reusable, high safety,
Effect is good.
To realize goal of the invention, present invention employs following technical solutions：
A kind of steel pipe pile cofferdam for bridge deepwater foundation, including bottom concrete, lock steel-pipe pile, reinforced concrete pile,
The bottom concrete is located at the top of riverbed bottom basement rock and partly extends down into the surface of basement rock, the bottom concrete
Lower section is equipped with the pile foundation for going deep into basement rock；The lock steel-pipe pile includes pile body and the lock set on the pile body wall surface, a plurality of
The lock steel-pipe pile is surrounded on the edge of the bottom concrete by the connection of the head and the tail of the lock, the pile body lower end with
Surface of bedrock contacts and the pile body lower end is integrally extended with the pile crown for going deep into surface of bedrock；It is additionally provided in the lock steel-pipe pile
Inner support, the inner support include H profile steel purlin and the horizontal supporting rod being set between the lock steel-pipe pile of offside；It is described mixed
By being extended downward into inside basement rock in the lock steel-pipe pile, the reinforced concrete pile includes concrete substrate and position for solidifying soil stake
Steel reinforcement cage in the concrete substrate.
It is latched as a preference of the present invention, the lock includes cloudy lock and sun, the cloudy lock is to be welded in the stake
The steel pipe of external wall, the sun lock is the I-steel for being welded in the pile body outer wall, and the cloudy lock is in itself and the pile body
Weld is equipped with interconnecting piece to side wall, and the interconnecting piece width is equal with the sun lock thickness.
Further, the lock steel-pipe pile includes plane stake and corner pile；The cloudy lock and the sun of the plane stake
It latches in coplanar in the type heart in floor projection；The cloudy lock of the corner pile is latched in sun in floor projection to hang down in 90 °
Directly.
As a preference of the present invention, it is described lock by the top of the pile body extend to downward vertically the pile body lower end with
The lower end of the pile crown junction, the lock has groove.
Further, the bevel angle is 30 °.
Further, the lock both sides are symmetrically welded with stiffener.
As a preference of the present invention, the pile crown length is 1.5-2 meters.
As a preference of the present invention, the pile crown end is equipped with expansion interface.
As a preference of the present invention, the support boom end be equipped with control joint, the control joint include connecting rod and
Connector set on the connecting rod front end, the connecting rod are that the threaded rod of the supporting rod is connected to screw nut pair,
The connector is end and the pile body surface is in the steel plate of male-female engagement, and the supporting rod is hollow stem, the connecting rod
Rear end be contained in inside the supporting rod.
Present invention simultaneously provides a kind of steel pipe pile cofferdam construction method for bridge deepwater foundation, for construction with
A kind of upper steel pipe pile cofferdam for bridge deepwater foundation, includes the following steps：
Step S1：It constructs the lock steel-pipe pile, the pile body, pile crown, lock is welded into integral lock steel-pipe pile；
Step S2：First time pile vibrosinking, by lock steel-pipe pile by vibration hammer vibration hammer stake, until the lock steel-pipe pile end
Sink to surface of bedrock；
Step S3：First time pilot hole, by the augers and scarfing cinder drill bit of Spiral digging machine to basement rock in the lock steel-pipe pile
1.5 meters -2 meters of drilling simultaneously forms free face；
Step S4：The lock steel-pipe pile is continued downward vibration dip by second of pile vibrosinking along the hole that first time pilot hole is formed
Stake, until the pile crown of the lock steel-pipe pile overlaps in the vertical direction with the hole that first time pilot hole is formed；
Step S5：Second of pilot hole, by the augers and scarfing cinder drill bit of Spiral digging machine by first in the lock steel-pipe pile
The bottom hole drilling depth identical with first time pilot hole that secondary pilot hole is formed；
Step S6：Pouring reinforcement concrete stake, places steel reinforcement cage in the lock steel-pipe pile, fill concrete under priming petock；
Step S7：By latch grafting the next lock steel-pipe pile is installed and repeat the above steps S1-S6 to formed enclosing
Steel pipe pile cofferdam；
Step S8：Steel pipe pile cofferdam internal drainage, the installation inner support, punching are poured pile foundation and back cover coagulation by follow-up work step
Soil.
The beneficial effects of the present invention are：
1. the lock steel-pipe pile of separation allows to consolidation of effectively taking root on exposed bedrock；
2. negative and positive lock processing is easy, the splicing between multiple lock steel-pipe piles is convenient, passes through plane stake and the cooperation of corner pile profit
In the enclosing shape and size for easily adjusting lock steel-pipe pile according to demand；
3. pile crown is extended downwardly by pile body, that is, latches the steel-pipe pile pile body that lock is located at when taking root consolidation on basement rock and do not go deep into base
Good consolidation effect can be realized in rock, facilitates construction, pile sinking and protection lock to realize recycling；
4. groove so that latch steel-pipe pile reduces its penetration resistance in piling, while avoiding the deformation or impaired of lock；
5. stiffener can improve the connective stability and support strength of lock, to have good mechanical property；
6. steel purlin and supporting rod provide the support of the extraneous hydraulic pressure of confrontation, relatively general showing with steel purlin entirely for lock steel-pipe pile
There is form of construction work, main support is played by steel purlin and the work in cofferdam can be improved by the cooperation of easy-to-mount supporting rod
Convenience in space and construction.
7. construction method work step is simple, mechanized construction, the lock steel-pipe pile support that construction speed is formed is incremental, at
This low, reusable, high safety.
Description of the drawings
Fig. 1 is the lateral schematic diagram in cofferdam of the present invention；
Fig. 2 is that present invention lock the perpendicular of steel-pipe pile cuts open schematic diagram；
Fig. 3 is the horizontal cross-section schematic diagram of plane stake of the present invention；
Fig. 4 is the horizontal cross-section schematic diagram of corner pile of the present invention；
Fig. 5 is the enlarged diagram at reinforced concrete pile of the present invention；
Fig. 6 is the end partial sectional view of supporting rod of the present invention；
Items are respectively in figure：1 bottom concrete, 11 pile foundations, 2 lock steel-pipe piles, 21 pile bodies, 22 pile crowns, 23 locks, 231 is cloudy
Lock, 232 sun locks, 233 interconnecting pieces, 234 stiffeners, 235 grooves, 3 reinforced concrete piles, 31 concrete substrates, 32 reinforcing bars
Cage, 4 steel purlins, 5 supporting rods, 51 control joints, 52 connecting rods, 53 connectors.
Specific implementation mode
Below in conjunction with attached drawing, the present invention will be described in detail：
Embodiment one
A kind of steel pipe pile cofferdam for bridge deepwater foundation as shown in Figure 1, 2, including bottom concrete 1, lock steel-pipe pile
2, reinforced concrete pile 3, bottom concrete 1 are located at the top of riverbed bottom basement rock and partly extend down into the surface of basement rock,
Bottom concrete 1 is in cuboid shape.1 lower section of bottom concrete is equipped with the pile foundation 11 for going deep into basement rock.It includes stake to latch steel-pipe pile 2
Body 21 and lock 23 set on 21 wall surface of pile body, a plurality of lock steel-pipe piles 2 are surrounded on back cover by the head and the tail connection of lock 23
The edge of concrete 1,21 lower end of pile body is contacted with the free face of surface of bedrock and 21 lower end of pile body is integrally formed and extends downwardly
There is the pile crown 22 for going deep into surface of bedrock.It is additionally provided with inner support in lock steel-pipe pile 2, inner support includes that H profile steel purlin 4 and level are set
Supporting rod 5 between the lock steel-pipe pile 2 of offside, with supporting rod 5, the circumference centered on steel purlin 4 is arranged number, to good
Good Auxiliary support performance.For reinforced concrete pile 3 by being extended downward into inside basement rock in lock steel-pipe pile 2, end depth is deep
The depth residing for pile crown 22.
As shown in figure 5, reinforced concrete pile 3 includes concrete substrate 31 and the steel reinforcement cage in concrete substrate 31
32。
As shown in Figure 3,4, in the present embodiment, lock 23 includes cloudy lock 231 and sun lock 232, and the moon lock 231 is weldering
It is connected to the steel pipe of 21 outer wall of pile body, sun lock 232 is the I-steel for being welded in 21 outer wall of pile body, and the moon lock 231 is in itself and pile body
21 welds are equipped with side wall the interconnecting piece 233 of seam shape, and 233 width of interconnecting piece is equal with sun 232 thickness of lock, is installing
When, the straight beam of I-steel in sun lock 232 is inserted into interconnecting piece 233 to the connection effect for forming grafting with vertically downward direction
Fruit.It includes plane stake and corner pile to latch steel-pipe pile 2；The cloudy lock 231 of plane stake is in type in floor projection with sun lock 232
The heart is coplanar；The cloudy lock 231 of corner pile is vertical in 90 ° in floor projection with sun lock 232.Such as the lock steel in the present embodiment
Pile pile 2 because bottom concrete 1 is cuboid, i.e., is set when enclosing in 1 edge of bottom concrete in the quadrangle in the cofferdam enclosed
Above-mentioned corner pile is set, the side for connecting quadrangle is connected by the plane stake being connected successively, forms sealing effect.
In the present embodiment, 23 both sides of lock are symmetrically welded with stiffener 234, and stiffener is small shape steel plate, at equidistant intervals
Form along lock 23 length direction welding setting.
In the present embodiment, lock 23 extends to 21 lower end of pile body by the top of pile body 21 and is connect with pile crown 22 downward vertically
Place, the lower end for latching 23 have groove 235.235 angle of groove is 30 °.
In the present embodiment, 22 length of pile crown is 1.5 meters.
Embodiment two
Technical solution described in the present embodiment is approximate with embodiment one, the difference is that：
In the present embodiment, 22 length of pile crown is 2 meters.
In the present embodiment, 22 end of pile crown is equipped with expansion interface.The expansion interface is the annular formed around 22 end of pile crown
If angle can weld extension on expansion interface with the demand for lengthening pile foundation depth by way of symmetrically subsidizing groove welding
Section.
Embodiment three
The present embodiment provides a kind of construction methods for constructing and implementing cofferdam described in example one comprising following steps：
Step S1：Construction lock steel-pipe pile 2, selects and selects 159mm using 820mm steel pipes as pile body 21 and pile crown 22, lock 23
Seamless steel pipe welds integral lock steel-pipe pile 2 as cloudy lock 231 using I18 i shaped steels as sun lock 232；
Step S2：First time pile vibrosinking, by lock steel-pipe pile 2 by DJZ120 vibration hammer vibration hammer stakes, until lock steel-pipe pile 2
Surface of bedrock is sunk in end；
Step S3：First time pilot hole, by the augers and scarfing cinder drill bit of XD220 Spiral digging machines to base in lock steel-pipe pile 2
1.5 meters of rock drilling simultaneously forms free face；
Step S4：Lock steel-pipe pile 2 is continued downward pile vibrosinking by second of pile vibrosinking along the hole that first time pilot hole is formed,
It is overlapped in the vertical direction with the hole that first time pilot hole is formed to the pile crown 22 for latching steel-pipe pile 2 and stretches into basement rock rock stratum 1.5m；
Step S5：Second of pilot hole, by the augers of XD220 Spiral digging machines and scarfing cinder drill bit by the in lock steel-pipe pile 2
The bottom hole pilot hole 1.5m again that pilot hole is formed；
Step S6：Pouring reinforcement concrete stake 2 is placed the steel reinforcement cage 32 of diameter 65cm in lock steel-pipe pile 2, is filled out under priming petock
Fill concrete；
Step S7：By latching the steel that next lock steel-pipe pile 2 is installed in grafting and the S1-S6 that repeats the above steps is enclosed to formation
The latch hook steel-pipe pile 2 to reduce downelling is installed according to water (flow) direction in pile pile cofferdam when steel cofferdam is installed in connection successively
Impact；
Step S8：Steel pipe pile cofferdam internal drainage, installation inner support, punching are poured pile foundation 11 and bottom concrete by follow-up work step
1。
Example IV
The present embodiment provides a kind of construction methods for constructing and implementing cofferdam described in example two comprising following steps：
Step S1：Construction lock steel-pipe pile 2, selects and selects 159mm using 820mm steel pipes as pile body 21 and pile crown 22, lock 23
Seamless steel pipe welds integral lock steel-pipe pile 2 as cloudy lock 231 using I18 i shaped steels as sun lock 232；
Step S2：First time pile vibrosinking, by lock steel-pipe pile 2 by DJZ120 vibration hammer vibration hammer stakes, until lock steel-pipe pile 2
Surface of bedrock is sunk in end；
Step S3：First time pilot hole, by the augers and scarfing cinder drill bit of XD220 Spiral digging machines to base in lock steel-pipe pile 2
2 meters of rock drilling simultaneously forms free face；
Step S4：Lock steel-pipe pile 2 is continued downward pile vibrosinking by second of pile vibrosinking along the hole that first time pilot hole is formed,
It is overlapped in the vertical direction with the hole that first time pilot hole is formed to the pile crown 22 for latching steel-pipe pile 2 and stretches into basement rock rock stratum 2m；
Step S5：Second of pilot hole, by the augers of XD220 Spiral digging machines and scarfing cinder drill bit by the in lock steel-pipe pile 2
The bottom hole pilot hole 2m again that pilot hole is formed；
Step S6：Pouring reinforcement concrete stake 2 is placed the steel reinforcement cage 32 of diameter 65cm in lock steel-pipe pile 2, is filled out under priming petock
Fill concrete；
Step S7：By latching the steel that next lock steel-pipe pile 2 is installed in grafting and the S1-S6 that repeats the above steps is enclosed to formation
The latch hook steel-pipe pile 2 to reduce downelling is installed according to water (flow) direction in pile pile cofferdam when steel cofferdam is installed in connection successively
Impact；
Step S8：Steel pipe pile cofferdam internal drainage, installation inner support, punching are poured pile foundation 11 and bottom concrete by follow-up work step
1。
Embodiment five
Technical solution described in the present embodiment is approximate with embodiment one, the difference is that：
As shown in fig. 6, in the present embodiment, 5 both ends end of supporting rod is equipped with control joint 51, and control joint 51 includes connecting rod 52
With the connector 53 set on 52 front end of connecting rod, connecting rod 52 is that the threaded rod of supporting rod 5 is connected to screw nut pair, connection
First 52 be the steel plate of end and 21 surface engagement of pile body.
In the present embodiment, supporting rod 5 is hollow stem, and the rear end of connecting rod 52 is contained in inside supporting rod 5.
When mounted, supporting rod 5 is horizontally placed on to two 2 insides of lock steel-pipe pile being oppositely arranged, the connector 52 of one end
It is supported in lock 2 inner surface H profile steel purlin 4 of steel-pipe pile by mating surface, hereafter, rotary supporting rod 5 passes through screw nut pair
Cooperation realize the opposite extension between connecting rod 52 and supporting rod 5, until connector 52 and the opposite H profile steel purlin of the other end
4 only support, and realize the cross-brace of fast assembling-disassembling.
Above example is only described the preferred embodiment of the present invention, not to the spirit and scope of the present invention
It is defined, under the premise of not departing from design concept of the present invention, ordinary people in the field makes technical scheme of the present invention
All variations and modifications, each fall within protection scope of the present invention, the claimed technology contents of the present invention, whole note
It carries in detail in the claims.
Claims (10)
1. a kind of steel pipe pile cofferdam for bridge deepwater foundation, including bottom concrete（1）, lock steel-pipe pile（2）, reinforcing bar it is mixed
Solidifying soil stake（3）, which is characterized in that the bottom concrete（1）It extends down into positioned at the top of riverbed bottom basement rock and partly
The surface of basement rock, the bottom concrete（1）Lower section is equipped with the pile foundation for going deep into basement rock（11）；The lock steel-pipe pile（2）Including
Pile body（21）With set on the pile body（21）The lock of wall surface（23）, a plurality of lock steel-pipe piles（2）Pass through the lock
（23）Head and the tail connection be surrounded on the bottom concrete（1）Edge, the pile body（21）Lower end contacted with surface of bedrock and
The pile body（21）Lower end is integrally extended with the pile crown for going deep into surface of bedrock（22）；The lock steel-pipe pile（2）In being inside additionally provided with
Support, the inner support includes H profile steel purlin（4）With the horizontal lock steel-pipe pile for being set to offside（2）Between supporting rod
（5）；The reinforced concrete pile（3）By the lock steel-pipe pile（2）It inside extends downward into inside basement rock, the armored concrete
Stake（3）Including concrete substrate（31）With positioned at the concrete substrate（31）Interior steel reinforcement cage（32）.
2. a kind of steel pipe pile cofferdam for bridge deepwater foundation according to claim 1, which is characterized in that the lock
（23）It is latched including the moon（231）It is latched with sun（232）, the cloudy lock（231）To be welded in the pile body（21）The steel of outer wall
Pipe, the sun lock（232）To be welded in the pile body（21）The I-steel of outer wall, the cloudy lock（231）Described in Yu Qiyu
Pile body（21）Weld is equipped with interconnecting piece to side wall（233）, the interconnecting piece（233）Width is latched with the sun（232）Thickness
It is equal.
3. a kind of steel pipe pile cofferdam for bridge deepwater foundation according to claim 2, which is characterized in that the lock
Steel-pipe pile（2）Including plane stake and corner pile；The cloudy lock of the plane stake（231）It is latched with sun（232）It is thrown in level
It is coplanar in the type heart on shadow；The cloudy lock of the corner pile（231）It is latched with sun（232）It is vertical in 90 ° in floor projection.
4. a kind of steel pipe pile cofferdam for bridge deepwater foundation according to claim 1, which is characterized in that the lock
（23）By the pile body（21）Top extend to the pile body downward vertically（21）Lower end and the pile crown（22）Junction, institute
State lock（23）Lower end have groove（235）.
5. a kind of steel pipe pile cofferdam for bridge deepwater foundation according to claim 4, which is characterized in that the groove
（235）Angle is 30 °.
6. being existed according to a kind of any steel pipe pile cofferdam for bridge deepwater foundation, feature in claim 1 to 5
In the lock（23）Both sides are symmetrically welded with stiffener（234）.
7. a kind of steel pipe pile cofferdam for bridge deepwater foundation according to claim 1, which is characterized in that the pile crown
（22）Length is 1.5-2 meters.
8. a kind of steel pipe pile cofferdam for bridge deepwater foundation according to claim 1, which is characterized in that the pile crown
（22）End is equipped with expansion interface.
9. a kind of steel pipe pile cofferdam for bridge deepwater foundation according to claim 1, which is characterized in that the support
Bar（5）End is equipped with control joint（51）, the control joint（51）Including connecting rod（52）With set on the connecting rod（52）
The connector of front end（53）, the connecting rod（52）To be connected to the supporting rod with screw nut pair（5）Threaded rod, it is described
Connector（52）For end and the pile body（21）The steel plate of surface engagement, the supporting rod（5）For hollow stem, the connecting rod
（52）Rear end be contained in the supporting rod（5）It is internal.
10. a kind of steel pipe pile cofferdam construction method for bridge deepwater foundation, for appointing in construction claim 1 to 9
A kind of steel pipe pile cofferdam for bridge deepwater foundation described in one, which is characterized in that include the following steps：
Step S1：It constructs the lock steel-pipe pile（2）, by the pile body（21）, pile crown（22）, lock（23）It welds integral
Latch steel-pipe pile（2）；
Step S2：First time pile vibrosinking will latch steel-pipe pile（2）By vibration hammer vibration hammer stake, until the lock steel-pipe pile
（2）Surface of bedrock is sunk in end；
Step S3：First time pilot hole, by the augers and scarfing cinder drill bit of Spiral digging machine in the lock steel-pipe pile（2）It is interior to base
1.5 meters -2 meters of rock drilling simultaneously forms free face；
Step S4：Second of pile vibrosinking, by the lock steel-pipe pile（2）Continue vibration downwards along the hole that first time pilot hole is formed
Pile sinking, until the lock steel-pipe pile（2）Pile crown（22）The hole formed with first time pilot hole overlaps in the vertical direction；
Step S5：Second of pilot hole, by the augers and scarfing cinder drill bit of Spiral digging machine in the lock steel-pipe pile（2）It is interior by
The bottom hole drilling depth identical with first time pilot hole that pilot hole is formed；
Step S6：Pouring reinforcement concrete stake（2）, in the lock steel-pipe pile（2）Interior placement steel reinforcement cage（32）, fill out under priming petock
Fill concrete；
Step S7：The next lock steel-pipe pile is installed by latching grafting（2）And the S1-S6 that repeats the above steps is enclosed to formation
The steel pipe pile cofferdam of conjunction；
Step S8：Steel pipe pile cofferdam internal drainage, the installation inner support, punching are poured pile foundation by follow-up work step（11）With back cover
Concrete（1）.
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| CN201810673613.XA CN108729457A (en) | 2018-06-27 | 2018-06-27 | A kind of steel pipe pile cofferdam and its construction method for bridge deepwater foundation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112609591A (en) * | 2020-12-22 | 2021-04-06 | 中铁建大桥工程局集团第一工程有限公司 | Construction method for deep-water shallow-covering-layer fully-socketed bridge foundation |
| CN112709252A (en) * | 2020-12-25 | 2021-04-27 | 中铁广州工程局集团有限公司 | Bearing platform construction method in semi-water flooding steep rock slope |
| CN113062341A (en) * | 2021-03-31 | 2021-07-02 | 广州市市政集团有限公司 | 8 font CT hasp steel-pipe pile and larsen steel sheet pile combination cofferdam structure |
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| CN112609591A (en) * | 2020-12-22 | 2021-04-06 | 中铁建大桥工程局集团第一工程有限公司 | Construction method for deep-water shallow-covering-layer fully-socketed bridge foundation |
| CN112709252A (en) * | 2020-12-25 | 2021-04-27 | 中铁广州工程局集团有限公司 | Bearing platform construction method in semi-water flooding steep rock slope |
| CN113062341A (en) * | 2021-03-31 | 2021-07-02 | 广州市市政集团有限公司 | 8 font CT hasp steel-pipe pile and larsen steel sheet pile combination cofferdam structure |
| CN113062341B (en) * | 2021-03-31 | 2022-04-12 | 广州市市政集团有限公司 | 8 font CT hasp steel-pipe pile and larsen steel sheet pile combination cofferdam structure |
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