CN106436689B - The supporting of cushion cap steel sheet pile and steel sheet pile double as cushion cap template construction method - Google Patents
The supporting of cushion cap steel sheet pile and steel sheet pile double as cushion cap template construction method Download PDFInfo
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- CN106436689B CN106436689B CN201610870183.1A CN201610870183A CN106436689B CN 106436689 B CN106436689 B CN 106436689B CN 201610870183 A CN201610870183 A CN 201610870183A CN 106436689 B CN106436689 B CN 106436689B
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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
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- General Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
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- Bulkheads Adapted To Foundation Construction (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Cushion cap template is doubled as the invention discloses a kind of cushion cap steel sheet pile supporting and steel sheet pile, 1）Surveying and locating；2）It excavates on old road；3) leading truck is set up；4）Inserting piling steel sheet pile；5）First time cushion cap earth excavation；6）Set up purlin and support；7）Second of cushion cap earth excavation；8）Cut pile crown, pile measurement；9）Pour concrete bed course；10）Set up cushion cap template；11）Cushion cap reinforcing bar is bound and pier stud reinforcing bar is set up；12）Set up separation layer；13）Pour cushion cap pier stud concrete；14）Remove support, purlin and steel sheet pile；15）Steel sheet pile pulls out the processing at place.Cushion cap steel sheet pile supporting provided by the invention and steel sheet pile double as cushion cap template, it is ensured that the structure in construction and personal safety；Ensure foundation pit periphery construction of structures, underground utilities, road normal use and safety, accelerate construction speed, it is ensured that the realization of constructing aims reduces earth excavation, stacking and the workload of transport, protects surrounding enviroment, reduces airborne dust influence.
Description
Technical field
The present invention relates to a kind of overpass construction method more particularly to a kind of cushion cap steel sheet pile supporting and steel sheet pile are simultaneous
Make cushion cap template.
Background technology
In elevated bridge construction, the construction quality of cushion cap often cannot be guaranteed, and often destroys periphery construction and build
The normal use and safety of object, underground utilities, road, and being connected road with it can be by the inconvenience of moving traffic；In cushion cap
When construction, earth excavation, stacking and the workload of transport can influence protection and the dust controlling of surrounding enviroment, can also be because of mistake
The hidden danger of quality of heavy excavation backfill uses restoring old road the influence of quality；Conventional arrangement and method for construction digging up and filling in roll less than
Position, can lead to the non-uniform sedimentation in road surface, delay construction speed, to affect the realization of constructing aims；In conclusion needle
To disadvantages mentioned above existing in the prior art, invention proposes a kind of cushion cap steel sheet pile supporting and steel sheet pile doubles as cushion cap template.
Invention content
The present invention the technical solution adopted is that provides a kind of cushion cap steel sheet pile supporting and steel to solve above-mentioned technical problem
Sheet pile doubles as cushion cap template, wherein
（One）Surveying and locating
According to the four angular coordinate for calculating cushion cap side and adding 10cm, steel sheet pile is marked after releasing quadrangle point with total powerstation
The position line；
（Two）It excavates on the old road of steel sheet pile insert division
Then the routing at steel sheet pile position abolishes old road face with cutting machine after wire cutting；
（Three）It sets up steel sheet pile and is inserted into leading truck
It prevents the bending deformation of steel sheet pile and improves the penetration capability of stake, certain rigidity, firm leading truck is set；
（Four）Inserting piling steel sheet pile is to designed elevation
Vibration hammer injection is matched using digging machine；
（Five）First time cushion cap earth excavation
It is cut the earth to the absolute altitude of purlin bottom in steel sheet pile with digging machine；
（Six）Set up purlin and support
After earth excavation to purlin bottom absolute altitude, is then hung in and enclosed with crane by design quantity welding bracket on steel sheet pile
Purlin is shelved on bracket and is welded；Then by purlin, welding consolidates at the angle of cut, finally angle steel is reinforced in welding in the angle of cut；
（Seven）Second of cushion cap earth excavation
It after the completion of purlin support is set up, is excavated to away from after at substrate 20cm absolute altitudes with digging machine, finally clear is dug using artificial
To design foundation pit bottom absolute altitude；
（Eight）Cut pile crown, pile measurement
Rear establishment officer in time abolishes cushion cap excavation of foundation pit with equipment progress pile crown in place, and it is mixed to cut pile crown using air compressor machine
Solidifying soil；
（Nine）Pour concrete bed course
Cushion cap bed course uses 10cm thickness C15 concretings, bed course to go out cushion cap 10cm per hem width；
（Ten）Cushion cap template is set up
The surrounding of foundation pit is previously placed in using bamboo slab rubber according to the size of cushion cap；
（11）Cushion cap reinforcing bar is bound and pier stud reinforcing bar is set up
After cushion cap blinding concrete reaches the 70% of design strength, you can carry out cushion cap reinforcing bar binding；
（12）Template adjustment is reinforced
Reinforcement installation in place, binds protective layer cushion block, then by the bamboo slab rubber of reinforcing bar surrounding on the outside of cushion cap facade reinforcing bar
Movement is labelled on cushion block of concrete bar protective layer；Medium coarse sand is backfilled on the outside of bamboo slab rubber at cushion cap 2/3；It is carried out using the lumps of wood on top
It reinforces；
（13）Set up separation layer
Cushion cap position disposes isolation board on the inside of steel sheet pile；
（14）Pour cushion cap pier stud concrete
Placement layer by layer, thickness are no more than 30cm, are vibrated using immersion vibrator, and vibrator is inserted into 5 in lower-layer concrete
~10 cm ensure the good combination of levels concrete；
（15）Remove support, purlin and steel sheet pile
After cushion cap concrete placings, after pier stud pours completion form removal, foundation pit backfill is carried out, steel sheet pile is pulled out；
（16）Steel sheet pile pulls out the processing at place
It is backfilled using medium coarse sand, i.e., pier stud concrete placings are completed, will after Pier Formwork, pier stud construction scaffolding are removed
Gap between steel sheet pile and cushion cap is filled up with medium coarse sand；The principle of vibration is pulled out using steel sheet pile by layer of sand vibration compacting, together
The mode of Shi Caiyong water fillings ensures the moistening of sand, is subject to sand surface not ponding；Cushion cap is backfilled using plain soil, is used
Digging machine layering leveling compacting.
Above-mentioned automatically controls track wheel type mobile job platform construction method, wherein in the step 3, leading truck is adopted
With single-layer double-side form, it is made of nose girder and purlin stake etc..
Above-mentioned automatically controls track wheel type mobile job platform construction method, wherein the spacing of purlin stake is generally 2.5
~3.5 meters, the spacing between two-sided purlin should not be too large, slightly bigger than sheet pile wall thickness by 8 from the point of view of protective layer thickness~
10mm。
Above-mentioned automatically controls track wheel type mobile job platform construction method, wherein in the step 4, before piling,
The grease in the fore shaft of sheet pile is squeezed into and is extracted to facilitate.
Above-mentioned automatically controls track wheel type mobile job platform construction method, wherein in the step 6, purlin and branch
Support is all made of H400 shaped steel.
Above-mentioned automatically controls track wheel type mobile job platform construction method, wherein in the step 8, controls foundation pile
Height of pile top is higher by cushion cap bottom surface 10cm, when pile crown will be dug in place, reduces broken pile dynamics, avoids the de- of mass concrete
It falls, to prevent from destroying protective layer and pile body.
Above-mentioned automatically controls track wheel type mobile job platform construction method, wherein in the step 12, cushion block number
Amount is no less than 5 pieces of settings by every square meter；Lumps of wood size is 100*50mm.
Above-mentioned automatically controls track wheel type mobile job platform construction method, wherein in the step 13, isolation board
For 12mm thickness.
The present invention has the advantages that compared with the existing technology：
1）Ensure the structure in construction and personal safety；
2）Ensure foundation pit periphery construction of structures, underground utilities, road normal use and safety；
3）Be conducive to maintain 204 national highway moving traffics and builder's road traffic, avoid caused by slope is excavated traffic and
Operation side is insufficient；
4）Be conducive to, by science organization's parallel line production, accelerate construction progress, it is ensured that the realization of constructing aims；
5）Earth excavation, stacking and the workload of transport can be reduced, protection surrounding enviroment reduce airborne dust influence；
6）Excavated surface can be reduced to greatest extent, the hidden danger of quality of excessive digging up and filling in is avoided to make to restoring old road
With the influence of quality, while conventional construction scheme can also be avoided, which to be rolled using digging up and filling in, not in place causes road surface non-uniform
Sedimentation.
Specific implementation mode
（One）Surveying and locating
According to the four angular coordinate for calculating cushion cap side and adding 10cm, steel sheet pile is marked after releasing quadrangle point with total powerstation
The position line；
（Two）It excavates on the old road of steel sheet pile insert division
Then the routing at steel sheet pile position abolishes old road face with cutting machine after wire cutting；
（Three）It sets up steel sheet pile and is inserted into leading truck
For ensure pile sinking axial location correct and stake it is vertical, control stake squeezes into precision, prevents the buckling of steel sheet pile
Deformation and the penetration capability for improving stake, are arranged certain rigidity, firm leading truck；
Leading truck uses single-layer double-side form, is made of nose girder and purlin stake etc., and the spacing of purlin stake is generally 2.5~
3.5 meters, the spacing between two-sided purlin should not be too large, slightly bigger than sheet pile wall thickness by 8 from the point of view of protective layer thickness~
10mm；
The following is should be noted that when leading truck is installed：Using the position of total powerstation and level meter control and adjustment nose girder；It leads
Depth of beam is suitable, to be conducive to the construction height for controlling steel sheet pile and improve construction efficiency；Nose girder cannot be with steel sheet pile
Set and generate sinking and deformation；The position of nose girder should be accurate, can not be collided with steel sheet pile；
（Four）Inserting piling steel sheet pile is to designed elevation
It the case where matching vibration hammer injection using digging machine, underground utilities, underground structure must be found out before injection, avoids damaging；
Before piling, to steel sheet pile by root inspection, the corrosion of connection fore shaft, the serious steel sheet pile of deformation are rejected, failure waits for
Rear is modified to can be used；
Before piling, the grease in the fore shaft of sheet pile is squeezed into and is extracted to facilitate；
It measures gradient of the monitoring per pile at any time during inserting piling and is no more than 0.3%, the side of pulling together cannot be used when deflection is excessive
When method is aligned, pulls up and beat again；
（Five）First time cushion cap earth excavation
Foundation pit shoveling replaces cooperation with the setting that purlin supports and carries out：First step digging machine is cut the earth in steel sheet pile to purlin
At the absolute altitude of bottom；
（Six）Set up purlin and support
Purlin and support are all made of H400 shaped steel.According to the construction plan and equipment of Design of Construction Organization and this special scheme
The model size of input and cushion cap supports bracket, purlin, angle brace in over-the-counter patterning process；
After earth excavation to purlin bottom absolute altitude, is then hung in and enclosed with crane by design quantity welding bracket on steel sheet pile
Purlin is shelved on bracket and is welded；Then by purlin, welding consolidates at the angle of cut, finally angle steel is reinforced in welding in the angle of cut；
（Seven）Second of cushion cap earth excavation
It after the completion of purlin support is set up, is excavated to away from after at substrate 20cm absolute altitudes with digging machine, finally clear is dug using artificial
To design foundation pit bottom absolute altitude；With closed muck haulage vehicle with digging with transporting outside construction site when earth excavation；
（Eight）Cut pile crown, pile measurement
Rear establishment officer in time abolishes cushion cap excavation of foundation pit with equipment progress pile crown in place, and it is mixed to cut pile crown using air compressor machine
Solidifying soil.In work progress, notice that controlling foundation pile height of pile top is higher by cushion cap bottom surface 10cm；When pile crown will be dug in place, reduce
Broken pile dynamics avoids falling off for mass concrete, to prevent from destroying protective layer and pile body；
After pile crown is cut in place, stake top loose concrete is all cut, removing surface is clean；It is set as stake top absolute altitude is less than
When counting absolute altitude, designed elevation must be connected to ad eundem concrete；
Pile quality is detected by design requirement, carries out stake position setting-out, measures deflected file amount, it can after qualified
Carry out next procedure construction；
（Nine）Pour concrete bed course
Cushion cap bed course uses 10cm thickness C15 concretings, bed course to go out cushion cap 10cm per hem width；Setting-out is carried out before construction,
It determines bed course plan-position and absolute altitude, prevents from entering inside cushion cap more than cushion cap bottom absolute altitude；
After the leveling compacting of foundation pit bottom, pour 10cm thickness C15 concrete cushions, vibration compacting, control bed course top mark height and
Flatness；
（Ten）Cushion cap template is set up
After cushion cap pit earthwork excavates, the soil on manual cleaning steel sheet pile uses 12cm bamboos according to the size of cushion cap
Offset plate is previously placed in the surrounding of foundation pit；The template of unilateral cushion cap is set to be formed piece fixation using batten on the outside of bamboo slab rubber
It is whole；
（11）Cushion cap reinforcing bar is bound and pier stud reinforcing bar is set up
After cushion cap blinding concrete reaches the 70% of design strength, you can carry out cushion cap reinforcing bar binding；Mat surface is cleaned,
It is measured on bed course and releases four angle points of cushion cap, restore cushion cap sideline；Pile crown reinforcing bar is derusted, conditioning is straight and curved to design angle
Degree ensures that pile crown reinforcement location is accurate；
Cushion cap reinforcing bar is concentrated in processing space and is made, and is carried out according to design drawing and related code requirement after being transported to construction site
Binding；Reinforcement construction sequence be：Cushion cap bottom layer of the reinforcing steel → cushion cap cableway → cushion cap side reinforcing bar → cushion cap top layer reinforcing bar →
Pier shaft embedded bar；
（12）Template adjustment is reinforced
Reinforcement installation in place, binds protective layer cushion block on the outside of cushion cap facade reinforcing bar, and cushion block quantity is no less than 5 by every square meter
Block is arranged, and then the movement of the bamboo slab rubber of reinforcing bar surrounding will be labelled on cushion block of concrete bar protective layer；It is thick in being backfilled on the outside of bamboo slab rubber
Sand is at cushion cap 2/3, i.e. positions 1.2m；Reinforced using the 100*50mm lumps of wood on top, ensure cushion cap geometric dimension and
Cushion block of concrete bar protective layer liner is secured；
（13）Set up separation layer
Cushion cap position disposes 12mm thickness isolation boards on the inside of steel sheet pile；
（14）Pour cushion cap pier stud concrete
Concrete strictly controls match ratio by blending station centralized mixing, and mix-proportion adjustment, temperature are carried out according to sandstone water content
When low the slump remove value, temperature it is high when the slump take upper value；
Concrete is transported by agitator truck to scene, concrete mixer cloth, placement layer by layer, and thickness is no more than 30cm；
It is vibrated using immersion vibrator, vibrator is inserted into 5~10 cm in lower-layer concrete, ensures the good knot of levels concrete
It closes；The closely knit mark of concrete vibrating is that concrete stops sinking, effervescent, bleeding, surface be not flat；
After concreting is complete, cushion cap top of concrete is modified, is smoothed out, smears second time and press polish after due-in slurry again
Processing, with the processing of pier stud binding site dabbing；
（15）Remove support, purlin and steel sheet pile
After cushion cap concrete placings, after pier stud pours completion form removal, foundation pit backfill is carried out, steel sheet pile is pulled out；Before pulling out sheet pile,
Specify the processing in native hole after the method, sequence and pile pulling of pile pulling；Can not excessively it draw because of the vibration effect and pile pulling band soil of pile pulling
The sedimentation and displacement for playing ground, closing on inhering architecture, structures or beneath pipeline；
（16）Steel sheet pile pulls out the processing at place
1, the related processing during pile pulling
Steel sheet pile will produce disturbance beating the during of pulling out to the periphery soil body, be applied according to engineering characteristic, structural relation and postorder
Work requirement, makees considered below：
1. cushion cap occupies the part road surface of existing road, function is used for original path can be restored after guarantee bearing platform construction；
2. original path has still maintained traffic, steel sheet pile to pull out about 1.5 meters of upright high slopes of rear cushion cap foundation pit and shake in vehicle
Stability requirement under dynamic；
3. what need to be restored at cushion cap foundation pit bankets to planting technique and bridge capping construction support stability requirement；
2, pile extracting method
This technology pile pulling uses vibration hammer pile pulling：The forced vibration generated using vibration hammer disturbs soil property, destroys sheet pile week
The cohesive strength of soil is enclosed to overcome pile extraction resistance, pulls out stake by the effect of additional lifting force；
3, cushion cap Foundation treatment
1. the following Foundation treatment in cushion cap top surface
It is backfilled using medium coarse sand, i.e., pier stud concrete placings are completed, will after Pier Formwork, pier stud construction scaffolding are removed
Gap between steel sheet pile and cushion cap is filled up with medium coarse sand；The principle of vibration is pulled out using steel sheet pile by layer of sand vibration compacting, together
The mode of Shi Caiyong water fillings ensures the moistening of sand, is subject to sand surface not ponding；
2. the above foundation pit in cushion cap top surface
Since the above upright slope height of cushion cap is 1.0~1.5m, there is traffic passage in outside, and traffic load is larger, in order to protect
Stability of slope and traffic safety are demonstrate,proved, according to construction period and construction needs, after steel sheet pile is pulled out, i.e., cushion cap is carried out using element soil
Backfill is layered leveling compacting using digging machine.After the completion of equal Coping Constructions, foundation pit is carried out at anti-excavation further according to design drawing
Reason.
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and it is perfect, therefore the present invention protection model
It encloses to work as and is subject to what claims were defined.
Claims (8)
1. a kind of cushion cap steel sheet pile supporting and steel sheet pile double as cushion cap template construction method, it is characterised in that：Include the following steps：
（One）Surveying and locating
According to the four angular coordinate for calculating cushion cap side and adding 10cm, steel sheet pile position is marked after releasing quadrangle point with total powerstation
Line；
（Two）It excavates on the old road of steel sheet pile insert division
Then the routing at steel sheet pile position abolishes old road face with cutting machine after wire cutting；
（Three）It sets up steel sheet pile and is inserted into leading truck
It prevents the bending deformation of steel sheet pile and improves the penetration capability of stake, certain rigidity, firm leading truck is set；
（Four）Inserting piling steel sheet pile is to designed elevation
Vibration hammer injection is matched using digging machine；
（Five）First time cushion cap earth excavation
It is cut the earth to the absolute altitude of purlin bottom in steel sheet pile with digging machine；
（Six）Set up purlin and support
After earth excavation to purlin bottom absolute altitude, then purlin is hung in crane and put on steel sheet pile by design quantity welding bracket
It sets on bracket and welds；Then by purlin, welding consolidates at the angle of cut, finally angle steel is reinforced in welding in the angle of cut；
（Seven）Second of cushion cap earth excavation
It after the completion of purlin support is set up, is excavated to away from after at substrate 20cm absolute altitudes with digging machine, finally clear is dug to setting using artificial
Count foundation pit bottom absolute altitude；
（Eight）Cut pile crown, pile measurement
Rear establishment officer in time abolishes cushion cap excavation of foundation pit with equipment progress pile crown in place, and pile crown coagulation is cut using air compressor machine
Soil；
（Nine）Pour concrete bed course
Cushion cap bed course uses 10cm thickness C15 concretings, bed course to go out cushion cap 10cm per hem width；
（Ten）Cushion cap template is set up
The surrounding of foundation pit is previously placed in using bamboo slab rubber according to the size of cushion cap；
（11）Cushion cap reinforcing bar is bound and pier stud reinforcing bar is set up
After cushion cap blinding concrete reaches the 70% of design strength, you can carry out cushion cap reinforcing bar binding；
（12）Template adjustment is reinforced
Reinforcement installation in place, binds protective layer cushion block on the outside of cushion cap facade reinforcing bar, then moves the bamboo slab rubber of reinforcing bar surrounding
It is labelled on cushion block of concrete bar protective layer；Medium coarse sand is backfilled on the outside of bamboo slab rubber at cushion cap 2/3；Added using the lumps of wood on top
Gu；
（13）Set up separation layer
Cushion cap position disposes isolation board on the inside of steel sheet pile；
（14）Pour cushion cap pier stud concrete
Placement layer by layer, thickness are no more than 30cm, are vibrated using immersion vibrator, and vibrator is inserted into 5~10 in lower-layer concrete
Cm ensures the good combination of levels concrete；
（15）Remove support, purlin and steel sheet pile
After cushion cap concrete placings, after pier stud pours completion form removal, foundation pit backfill is carried out, steel sheet pile is pulled out；
（16）Steel sheet pile pulls out the processing at place
It is backfilled using medium coarse sand, i.e., pier stud concrete placings are completed, after Pier Formwork, pier stud construction scaffolding are removed, by steel plate
Gap between stake and cushion cap is filled up with medium coarse sand；The principle for pulling out vibration using steel sheet pile adopts layer of sand vibration compacting simultaneously
With the mode of water filling, ensure the moistening of sand, is subject to sand surface not ponding；Cushion cap is backfilled using plain soil, using digging machine
Layering leveling compacting.
2. a kind of cushion cap steel sheet pile supporting as described in claim 1 and steel sheet pile double as cushion cap template construction method, feature
It is：In the step 3, leading truck uses single-layer double-side form, is made of nose girder and purlin stake.
3. a kind of cushion cap steel sheet pile supporting as claimed in claim 2 and steel sheet pile double as cushion cap template construction method, feature
It is：The spacing of purlin stake is 2.5~3.5 meters, and the spacing between two-sided purlin should not be too large, from the point of view of protective layer thickness
It is bigger 8~10mm than sheet pile wall thickness.
4. a kind of cushion cap steel sheet pile supporting as described in claim 1 and steel sheet pile double as cushion cap template construction method, feature
It is：In the step 4, before piling, the grease in the fore shaft of sheet pile is squeezed into and is extracted to facilitate.
5. a kind of cushion cap steel sheet pile supporting as described in claim 1 and steel sheet pile double as cushion cap template construction method, feature
It is：In the step 6, purlin and support are all made of H400 shaped steel.
6. a kind of cushion cap steel sheet pile supporting as described in claim 1 and steel sheet pile double as cushion cap template construction method, feature
It is：In the step 8, control foundation pile height of pile top is higher by cushion cap bottom surface 10cm, when pile crown will be dug in place, reduces broken
Stake dynamics, avoids falling off for mass concrete, to prevent from destroying protective layer and pile body.
7. a kind of cushion cap steel sheet pile supporting as described in claim 1 and steel sheet pile double as cushion cap template construction method, feature
It is：In the step 12, cushion block quantity is no less than 5 pieces of settings by every square meter；Lumps of wood size is 100*50mm.
8. a kind of cushion cap steel sheet pile supporting as described in claim 1 and steel sheet pile double as cushion cap template construction method, feature
It is：In the step 13, isolation board is 12mm thick.
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| CN110258607A (en) * | 2019-06-28 | 2019-09-20 | 王义东 | A kind of convenient construction method of bridge construction that mass concrete Pile-supported stand foundation is set |
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| CN111894006A (en) * | 2020-07-24 | 2020-11-06 | 保利长大工程有限公司 | Steel sheet pile supporting structure serving as cushion cap formwork support and construction method |
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