CN115324086A - Cofferdam and drilling platform integrated system and application construction method thereof - Google Patents
Cofferdam and drilling platform integrated system and application construction method thereof Download PDFInfo
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- CN115324086A CN115324086A CN202210910642.XA CN202210910642A CN115324086A CN 115324086 A CN115324086 A CN 115324086A CN 202210910642 A CN202210910642 A CN 202210910642A CN 115324086 A CN115324086 A CN 115324086A
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- 238000005553 drilling Methods 0.000 title claims abstract description 134
- 238000010276 construction Methods 0.000 title claims abstract description 69
- 230000008093 supporting effect Effects 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000000034 method Methods 0.000 description 19
- 238000004873 anchoring Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 7
- 238000005086 pumping Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0004—Nodal points
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
- E02B17/027—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto steel structures
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Foundations (AREA)
Abstract
The invention provides a cofferdam and drilling platform integrated system and an application construction method thereof, and the technical scheme is that the cofferdam and drilling platform integrated system comprises a cofferdam and an auxiliary support module which are inserted on a riverbed, wherein the auxiliary support module is positioned at the inner side of the cofferdam, the cofferdam and drilling platform which is arranged along the top of the cofferdam in a surrounding manner, and the drilling platform which is erected on the top surface of the pad beam and is used for pile foundation construction in the cofferdam; the top of the auxiliary support module is connected with the bottom of the drilling platform; the auxiliary support module is positioned at the center of the drilling platform; in addition, the application construction method of the system is further disclosed, the drilling platform can be erected at the top of the cofferdam, the connection between the cofferdam and the drilling platform is simplified, the operation of workers is facilitated, the operation efficiency and the construction quality of the drilling platform are improved, and the pile foundation is constructed in a dry environment in a mode that the cofferdam is pumped firstly and then the pile foundation is constructed.
Description
Technical Field
The invention relates to the technical field of bearing platform construction, in particular to a cofferdam and drilling platform integrated system and an application construction method thereof.
Background
The construction of present aquatic pile foundation cushion cap has two kinds of modes, the first kind is set up drilling platform earlier, carry out the pile foundation construction through drilling platform, demolish drilling platform after the pile foundation is accomplished, go back installation cofferdam structure, carry out the cushion cap construction in cofferdam structure, relatively the first kind, the second kind is the present more construction mode that adopts, place tubular pile and sheet pile in advance, form cofferdam structure, utilize cofferdam structure as drilling platform basis, set up drilling platform on the cofferdam, carry out the pile foundation construction through drilling platform, demolish drilling platform after the pile foundation is accomplished and can carry out the cushion cap construction.
The bottom of the existing drilling platform is erected in the cofferdam, connecting pieces need to be arranged at different positions of the inner wall of the cofferdam before the drilling platform is built, the drilling platform is connected to the connecting pieces, but higher construction precision is needed when different connecting pieces are controlled to be positioned at the same horizontal height, the difficulty is higher, the levelness of the drilling platform is low, and the quality is poorer; in addition, the drilling platform is limited by construction space, so that the drilling platform is inconvenient for workers to operate and low in operation efficiency.
Disclosure of Invention
The invention aims to provide a cofferdam and drilling platform integrated system and an application construction method thereof, which are used for erecting a drilling platform at the top of a cofferdam, simplifying the connection between the cofferdam and the drilling platform, facilitating the operation of workers and improving the operation efficiency and the construction quality of the drilling platform.
In order to achieve the above object, the present invention provides the following technical solutions:
the cofferdam and drilling platform integrated system comprises a cofferdam and an auxiliary supporting module, wherein the cofferdam and the auxiliary supporting module are used for being inserted on a riverbed, the auxiliary supporting module is positioned on the inner side of the cofferdam, the cofferdam and drilling platform are arranged along the top of the cofferdam in a surrounding manner, and the drilling platform is erected on the top surface of the pad beam and is used for pile foundation construction in the cofferdam; the pad beam is respectively connected with the bottom of the drilling platform and the top of the cofferdam, and the top of the auxiliary support module and the top surface of the pad beam are at the same horizontal height and are connected with the bottom of the drilling platform; the auxiliary support module is located at the center of the drilling platform.
The drilling platform comprises a panel, a plurality of Bailey beams and a pile top bearing beam, wherein the panel, the Bailey beams and the pile top bearing beam are sequentially connected from top to bottom, the Bailey beams and the pile top bearing beam are arranged in a staggered manner, and two ends of the pile top bearing beam are respectively connected with the top surfaces of two opposite sides of the pad beam.
And further arranging at least two pile top bearing beams opposite to the top surfaces of the side walls on two opposite sides of the cofferdam, wherein at least one pile top bearing beam is connected with the top of the auxiliary support module.
The drilling platform further comprises a distribution beam arranged between the Bailey beam and the panel; the distribution beams and the Bailey beams are arranged in a staggered mode, and the distribution beams are respectively connected with the bottom face of the panel and the top face of the Bailey beams.
The auxiliary support module comprises at least two auxiliary piles which are inserted on the riverbed; and at least two pile top bearing beams are respectively connected with the top ends of the corresponding auxiliary piles.
The pile comprises a plurality of auxiliary piles, wherein the auxiliary piles are arranged in a rectangular structure, the two auxiliary piles are symmetrically arranged on two opposite sides, and the top ends of the two auxiliary piles are connected with the corresponding pile top bearing beam.
Further provided, the auxiliary support module further comprises a first support; and two ends of the first supporting piece are respectively connected with the adjacent auxiliary piles.
Further provided, the device further comprises an inner support module; the inner support module comprises an enclosing purlin and a plurality of second support pieces, the enclosing purlin is arranged along the inner wall of the cofferdam in a surrounding mode, the second support pieces are located on the inner side of the enclosing purlin, the second support pieces correspond to the inner walls of the two adjacent sides of the enclosing purlin, and the outer side wall of the enclosing purlin is connected with the inner side wall of the cofferdam.
The cofferdam is further arranged and comprises tubular piles and sheet piles which are inserted into the riverbed and are alternately arranged, and the tubular piles and the sheet piles are connected end to form the cofferdam.
The technical scheme also provides an application construction method of the cofferdam and drilling platform integrated system, which comprises the following application construction steps based on the cofferdam and drilling platform integrated system:
inserting cofferdams and auxiliary supporting modules which are used for being inserted on the riverbed;
the top surface of the pad beam and the top of the auxiliary support module are at the same horizontal height;
building a drilling platform, and building the drilling platform on the top surface of the pad beam and the top of the auxiliary support module;
and draining accumulated water in the cofferdam, and performing pile foundation construction in the cofferdam through the drilling platform.
Compared with the prior art, the scheme of the invention has the following advantages:
1. in the cofferdam and drilling platform integrated system, the pad beam is arranged at the top of the cofferdam, the pad beam extends along the axial direction of the cofferdam to form a surrounding structure, the edge of the bottom of the drilling platform is connected with the top surface of the pad beam, the center of the bottom of the drilling platform is connected with the top of the auxiliary support module, the pad beam and the auxiliary support module jointly support the drilling platform, and the top surface of the pad beam is level with the top of the auxiliary support module, namely at the same horizontal height, so that the constructed drilling platform is high in levelness and good in quality, the limitation of an operation space is avoided, the construction precision requirement and the operation difficulty are reduced, the operation efficiency is improved, and the drilling platform can conveniently construct high-quality pile foundations.
2. In the cofferdam and drilling platform integrated system, pile top bearing beams and Bailey beams are connected in a criss-cross overlapping mode to serve as a supporting foundation of the drilling platform, the pile top bearing beams are erected and connected to the top surface of a pad beam, and a panel is fixed on the upper side of the Bailey beams to form a stable drilling platform.
3. In the cofferdam and drilling platform integrated system, by arranging the placing positions of the pile top bearing beams, part of the pile top bearing beams fall right above the top surface of the side wall of the cofferdam and part of the pile top bearing beams fall right above the auxiliary support module, so that the downward pressure of the drilling platform can be vertically transmitted to the cofferdam and the auxiliary support module, and the cofferdam and the auxiliary support module have better supporting effect.
4. In the cofferdam and drilling platform integrated system, the distribution beams are erected between the Bailey beams and the panels, the distribution beams and the Bailey beams are arranged in a criss-cross mode, and the panels are paved and connected on the top surfaces of the distribution beams, so that the supporting foundation of the drilling platform is strengthened.
5. In the cofferdam and drilling platform integrated system, the auxiliary piles in the auxiliary support modules are inserted on the river bed, the pile top bearing beams are matched with the auxiliary piles, the downward pressure of the drilling platform is transmitted to the river bed through the auxiliary piles and the cofferdam, at least two auxiliary piles are arranged, support points are increased, the support quality is improved, the load of a single auxiliary pile is reduced, the integral support strength of the auxiliary support modules is improved, and the service life of the auxiliary support modules is prolonged.
6. In the construction method of the cofferdam and drilling platform integrated system, the method of pumping water from the cofferdam and then pumping the pile foundation is adopted, so that a closed environment can be formed firstly, an over-long steel casing is not needed to be arranged in the construction of the pile foundation on water, the water head pressure difference is not needed to be considered in the drilling process, the pile foundation is constructed in a dry operation environment, the construction of the pile foundation on water with the water source protection requirement can be realized, the cost is saved, the environment-friendly requirement can be met, and the guarantee is provided for the environmental construction.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic front view of an integrated cofferdam and drilling platform system in an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of A of FIG. 1 in an embodiment of the present invention;
FIG. 3 is a schematic side view of an integrated cofferdam and drilling platform system according to an embodiment of the present invention;
fig. 4 is a top view of the arrangement of cofferdams, pile top spandrels and beret beams in an embodiment of the present invention;
FIG. 5 is a top plan view of the arrangement of the auxiliary support modules, inner support modules and cofferdam in an embodiment of the invention;
FIG. 6 is a diagram illustrating the effect of the combination of the auxiliary pile and the first supporting member according to an embodiment of the present invention;
fig. 7 is an application and construction method of the cofferdam and drilling platform integrated system in an embodiment of the invention.
Reference numerals are as follows: 1. a riverbed; 2. a base groove; 3. cofferdam; 4. a bolster; 5. drilling a platform; 6. an auxiliary support module; 7. an inner support module; 8. an anchoring layer;
21. a cofferdam groove; 22. pile holes; 31. a tubular pile; 32. sheet piling;
51. pile top spandrel girder; 52. a Bailey beam; 53. a distribution beam; 54. a panel;
61. auxiliary piles; 62. a first support member; 71. enclosing purlins; 72. a second support member.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1-4, the invention provides a cofferdam and drilling platform integrated system, comprising a cofferdam 3 for being inserted on a riverbed 1, an auxiliary support module 6, a pad beam 4 arranged around the top of the cofferdam 3, and a drilling platform 5 for pile foundation construction in the cofferdam 3, wherein the auxiliary support module 6 is positioned at the inner side of the cofferdam 3; the pad beam 4 is respectively connected with the bottom of the drilling platform 5 and the top of the cofferdam 3, and the top of the auxiliary support module 6 and the top surface of the pad beam 4 are at the same horizontal height and are connected with the bottom of the drilling platform 5; the auxiliary support module 6 is located at the center of the drilling platform 5.
The implementation mode is, arrange pad beam 4 through the top at cofferdam 3, pad beam 4 forms around the structure along cofferdam 3's axial extension, the edge of drilling platform 5's bottom is connected with the top surface of pad beam 4, the center department of drilling platform 5's bottom is connected with the top of auxiliary stay module 6, pad beam 4 and auxiliary stay module 6 bear drilling platform 5 jointly, the top surface of pad beam 4 keeps the same with the top of auxiliary stay module 6, be in same level promptly, make the drilling platform 5's of building levelness high, the quality is better, avoid the operation space to be restricted, construction accuracy requirement and the operation degree of difficulty have been reduced, the operating efficiency is improved, be convenient for drilling platform 5 to construct high-quality pile foundation.
The bolster 4 increases the contact area of the drilling platform 5 and the cofferdam 3, and simultaneously, the top of the cofferdam 3 is leveled, and all parts of the bottom of the drilling platform 5 are positioned on the same plane.
The drilling platform 5 is built, the edge and the center of the bottom of the drilling platform 5 are respectively built on the top surface of the pad beam 4 and the top of the auxiliary support module 6, the drilling platform 5 is respectively connected with the pad beam 4 and the auxiliary support module 6, and in addition, the auxiliary support module 6 can also be located at the non-center of the drilling platform 5, for example, corresponding adjustment arrangement is carried out according to the position of the center of gravity of the drilling platform 5.
The concrete structure of the drilling platform 5 is that the drilling platform 5 comprises a panel 54, a plurality of bailey beams 52 and a pile top bearing beam 51, the panel 54, the bailey beams 52 and the pile top bearing beam 51 are sequentially connected from top to bottom, the bailey beams 52 and the pile top bearing beam 51 are arranged in a staggered manner, and two ends of the pile top bearing beam 51 are respectively connected with the top surfaces of two opposite sides of the pad beam 4.
The pile top bearing beams 51 and the Bailey beams 52 are connected in a criss-cross overlapping mode to serve as a supporting foundation of the drilling platform 5, the pile top bearing beams 51 are erected and connected on the top surface of the backing beam 4, and the panel 54 is fixed on the upper side of the Bailey beams 52 to form the stable drilling platform 5.
The arrangement mode of the pile top bearing beams 51 is that at least two pile top bearing beams 51 are arranged opposite to the top surfaces of the side walls at two opposite sides of the cofferdam 3, and at least one pile top bearing beam 51 is connected with the top of the auxiliary support module 6.
Through arranging the placing positions of the pile top bearing beams 51, part of the pile top bearing beams 51 fall right above the top surface of the side wall of the cofferdam 3, and part of the pile top bearing beams 51 fall right above the auxiliary supporting module 6, so that the downward pressure of the drilling platform 5 can be vertically transmitted to the cofferdam 3 and the auxiliary supporting module 6, and the cofferdam 3 and the auxiliary supporting module 6 have a better supporting effect.
Preferably, the drilling platform 5 further comprises a distribution beam 53 arranged between the beret beam 52 and the panel 54; the distribution beams 53 and the beret beams 52 are arranged in a staggered manner, and the distribution beams 53 are respectively connected with the bottom surface of the panel 54 and the top surface of the beret beams 52.
The distribution beams 53 are erected between the Bailey beams 52 and the panels 54, the distribution beams 53 and the Bailey beams 52 are arranged in a criss-cross mode, and the panels 54 are paved and connected on the top surfaces of the distribution beams 53, so that the supporting foundation of the drilling platform 5 is strengthened.
In some embodiments, the auxiliary support module 6 comprises at least two auxiliary piles 61 for being inserted on the river bed 1; at least two of the pile top bearing beams 51 are connected with the top ends of the corresponding auxiliary piles 61, respectively.
In specific implementation, the auxiliary piles 61 are arranged in a rectangular structure, the auxiliary piles 61 on two opposite sides are symmetrically arranged, and the top ends of the two symmetrically arranged auxiliary piles 61 are connected with the corresponding pile top bearing beam 51.
The setting of arranging of supplementary stake 61 saves pile bolck spandrel girder 51's quantity, improves single pile bolck spandrel girder 51's bearing effect simultaneously, through two supplementary stakes 61 with drilling platform 5 down force transmission to the riverbed 1 on, improve the support effect.
In a further refinement, the auxiliary support module 6 further comprises a first support 62; the two ends of the first support 62 are respectively connected with the adjacent auxiliary piles 61.
As shown in fig. 6, two adjacent auxiliary piles 61 are connected by a first support member 62 and are connected into a whole to be used, so that the strength of the auxiliary support module 6 is improved, and the auxiliary piles 61 are arranged in corresponding numbers and arrangement modes according to actual conditions, thereby pertinently enhancing the support effect.
As shown in fig. 5, the internal support module 7 has a specific structure that the internal support module 7 further includes an internal support module 7, where the internal support module 7 includes a surrounding purlin 71 arranged around the inner wall of the cofferdam 3, and a plurality of second supporting members 72 located inside the surrounding purlin 71; the corresponding second supporting pieces 72 are connected between the inner walls of two adjacent sides of the enclosing purlin 71, and the outer side wall of the enclosing purlin 71 is connected with the inner side wall of the cofferdam 3.
Preferably, at least two inner support modules 7 are provided, and the adjacent inner support modules 7 are arranged at intervals up and down.
The number of layers of the enclosing purlin 71 is reasonably distributed according to the depth of the cofferdam 3, the enclosing purlin is distributed at intervals along the axial direction of the cofferdam 3, the cofferdam 3 is supported at different heights, and the supporting strength and the retaining effect of the cofferdam 3 are improved.
The cofferdam 3 has the specific structure that the cofferdam 3 comprises tubular piles 31 and sheet piles 32 which are inserted into the riverbed 1, and the tubular piles 31 and the sheet piles 32 are alternately arranged and are enclosed end to form the cofferdam 3.
With reference to fig. 1 and 7, the present invention further provides an application and construction method of the cofferdam and drilling platform integrated system, which is based on the application and construction steps of the cofferdam and drilling platform integrated system as described above:
inserting a cofferdam 3 and an auxiliary support module 6 which are used for being inserted on the riverbed 1;
the pad beams 4 are arranged along the top surface of the cofferdam 3 in a surrounding way, and the top surfaces of the pad beams 4 and the top of the auxiliary supporting module 6 are at the same horizontal height;
building a drilling platform 5, and building the drilling platform 5 on the top surface of the pad beam 4 and the top of the auxiliary support module 6;
and (4) draining accumulated water in the cofferdam 3, and performing pile foundation construction in the cofferdam 3 through the drilling platform 5.
According to the construction method, the mode that the cofferdam 3 pumps water and then the pile foundation is adopted, a closed environment can be formed firstly, so that the construction of the pile foundation on water does not need to be provided with an over-long steel pile casing, the water head pressure difference does not need to be considered in the drilling process, the pile foundation is constructed in a dry operation environment, the cost can be saved for the construction of the pile foundation on water with the water source protection requirement, the environment protection requirement can be met, and the guarantee is provided for the environmental construction.
Preferably, when the drilling bottle body is erected on the top surface of the pad beam 4 and the top of the auxiliary supporting module 6, the method further comprises the following construction steps:
the edge and the center of the bottom of the drilling platform 5 are respectively arranged on the top surface of the pad beam 4 and the top of the auxiliary supporting module 6 in an overlapping mode, and the drilling platform 5 is respectively connected with the pad beam 4 and the auxiliary supporting module 6.
Preferably, before the pile foundation construction in the cofferdam 3 through the drilling platform 5, the method further comprises the following construction steps:
a plurality of inner support modules 7 which are arranged at intervals up and down are erected on the inner wall of the cofferdam 3, and the inner support modules 7 are arranged along the inner wall of the cofferdam 3 in a surrounding mode and are connected with the inner wall of the cofferdam 3.
Further improvement, when a plurality of internal support modules 7 which are arranged at intervals up and down are erected on the inner wall of the cofferdam 3, the construction method further comprises the following construction steps:
accumulated water in the cofferdam 3 is discharged layer by layer, and when one layer of accumulated water is discharged, an inner support module 7 is correspondingly erected on the inner wall of the cofferdam 3, and the inner support modules 7 are erected downwards in sequence until the accumulated water is completely discharged out of the cofferdam 3.
In the construction process, accumulated water in the cofferdam 3 is drained while the purlin 71 is continuously erected downwards, so that the construction efficiency is improved, and the construction progress is accelerated; under the circumstances of discharge ponding, erect and enclose purlin 71, improved and erect precision and joint strength, also improved maneuverability, reduce the construction degree of difficulty, facilitate for workman's construction.
In addition, accumulated water in the cofferdam 3 is removed, the enclosing purlins 71 are continuously erected downwards, the enclosing purlins 71 are erected at different heights of the cofferdam 3, different enclosing purlins 71 support different positions of the cofferdam 3 in the axial direction, the whole cofferdam 3 is uniformly stressed, and the supporting effect of the auxiliary piles 61 on the cofferdam 3 is improved.
In the concrete implementation, when the pile foundation construction is performed in the cofferdam 3 through the drilling platform 5, the method further comprises the following steps:
a drilling machine for constructing the pile holes 22 is arranged on the drilling platform 5.
In a further improvement of this embodiment, before the cofferdam 3 and the auxiliary supporting module 6 inserted for being inserted on the river bed 1, the method further comprises the following construction steps:
a foundation trench 2 and a pile hole 22 for inserting the auxiliary support module 6 are dug on the riverbed 1 and positioned at the bottom of the foundation trench 2.
The foundation trench 2 and the pile hole 22 are dug, and then the auxiliary support module 6 is inserted into the pile hole 22, so that positioning is provided for inserting of the auxiliary pile 61, and construction accuracy is improved.
In the specific implementation, the foundation trench 2 and the pile hole 22 are dug by adopting a rotary drilling construction process, when the soil layer of the riverbed 1 has good cohesiveness, a dry or clean water drilling process can be adopted, and mud is not needed for wall protection; when the soil layer of the riverbed 1 is loose and easy to collapse, a static mud wall protection drilling process is adopted, and wall protection mud or stabilizing liquid is thrown into the hole for wall protection.
As shown in fig. 5 and 7, in practical applications, when the cofferdam 3 and the auxiliary supporting module 6 are inserted for being inserted on the river bed 1, the method further includes the following construction steps:
the auxiliary support modules 6 are firstly inserted into the pile holes 22, and then the tubular piles 31 and the sheet piles 32 are alternately inserted on the bottom of the foundation trench 2 until the end to enclose the cofferdam 3.
Preferably, when the pipe piles 31 and the sheet piles 32 are alternately inserted on the riverbed 1 along the surrounding purlin 71, the method comprises the following construction steps:
the pipe piles 31 and the sheet piles 32 are inserted into the two sides of the width direction of the riverbed 1, and then the pipe piles 31 and the sheet piles 32 are inserted into the two sides of the length direction of the riverbed 1 until the two sides are connected end to end for folding.
In a further improvement, before the drilling platform 5 is built, the following construction steps are further included:
and an anchoring layer 8 is poured between the auxiliary support module 6 and the cofferdam 3 and between the cofferdam 3 and the inner wall of the foundation trench 2 for filling.
Preferably, when the anchoring layer 8 is poured between the auxiliary support module 6 and the inner wall of the cofferdam 3, the cofferdam 3 and the foundation trench 2 for filling, the method comprises the following construction steps:
the anchoring layers 8 are symmetrically poured on the inner side of the cofferdam 3 and between the cofferdam 3 and the side wall of the foundation trench 2.
The anchoring layers 8 are arranged on the inner side and the outer side of the cofferdam 3 in a symmetrical pouring mode, so that the inner side and the outer side of the cofferdam 3 are stressed equally, and the cofferdam 3 is prevented from being in an inclined extending state.
In the specific implementation, conduits are arranged on the inner side and the outer side of the cofferdam 3 along the cofferdam 3, underwater concrete is poured through the conduits, the underwater concrete is guided to a position needing pouring, and an anchoring layer 8 is formed after the underwater concrete is solidified; and symmetrically pouring the inner side and the outer side of the cofferdam 3, and measuring while pouring until the designed elevation is reached.
In this practical application, through pouring anchor layer 8 in foundation trench 2, anchor layer 8 concreties in foundation trench 2's bottom, anchor layer 8 after the consolidation fixes auxiliary stay module 6 and cofferdam 3 in foundation trench 2, improve auxiliary pile 61 and riverbed 1, cofferdam 3 and foundation trench 2's joint strength, reduce because of the produced influence of flood tide and tide fall or other factors, thereby improve the fender and the stagnant water effect of cofferdam 3, prevent that the river from permeating in cofferdam 3 from cofferdam 3's bottom.
Preferably, when the anchoring layer 8 is poured between the auxiliary support module 6 and the inner wall of the cofferdam 3 and the foundation trench 2 for filling, the method comprises the following construction steps:
the anchoring layer 8 is poured between the auxiliary support module 6 and the pile hole 22 for filling.
When the anchoring layer 8 is poured, the anchoring layer 8 is poured between the auxiliary support module 6 and the inner wall of the pile hole 22, and the connection between the auxiliary support module 6 and the pile hole 22 is strengthened.
In practice, when the pipe piles 31 and sheet piles 32 are inserted alternately on the bottom of the foundation trench 2, the bottom of the foundation trench 2 forms a cofferdam trench 21 for inserting the cofferdam 3.
The tubular piles 31 and the sheet piles 32 are inserted and beaten on the bottom of the foundation trench 2 in a mode of adding a vibration pile hammer by a crane instead of adopting a trench pre-dug at the bottom of the foundation trench 2 for inserting the cofferdam 3, so that the gap between the side wall of the cofferdam 3 and the rock stratum of the riverbed 1 is smaller, and the connection quality of the cofferdam 3 is improved.
Wherein, the base groove 2 plays a certain limiting role in the link and provides reference for the insertion.
In addition, because the cofferdam 3 in this embodiment is composed of the tubular pile 31 and the sheet pile 32, the cross-sectional shape is special, the dug groove structure is difficult to match with the cofferdam 3, if the cofferdam 3 is inserted by adopting the pre-dug groove, the problem that the insertion cannot be performed or the width of the groove is large can exist, and the insertion effect of the cofferdam 3 is greatly reduced.
Preferably, when the anchoring layer 8 is poured between the auxiliary support module 6 and the inner wall of the cofferdam 3, the cofferdam 3 and the foundation trench 2 for filling, the method comprises the following construction steps:
the anchoring layer 8 is poured between the cofferdam groove 21 and the cofferdam 3 for filling.
The cofferdam 3 is erected on the bottom of the foundation trench 2 in a plugging mode, after the cofferdam 3 is completely plugged, a cofferdam trench 21 for the cofferdam 3 to be plugged is formed in the corresponding position of the bottom of the foundation trench 2, and similarly, when the anchoring layer 8 is poured, the anchoring layer 8 is poured between the cofferdam 3 and the inner wall of the cofferdam trench 21, so that the connection between the cofferdam 3 and the cofferdam trench 21 is strengthened.
Before draining the accumulated water in the cofferdam 3, the construction method further comprises the following construction steps:
after the underwater concrete is poured, waiting for 7-10 days, and fixing the underwater concrete into an anchoring layer 8, wherein the consolidation strength reaches 90%.
The main construction process of the invention is as follows: firstly, inserting and driving an auxiliary support module 6, namely 4 auxiliary piles with the diameter of 820, by using a crane and a pile vibrating hammer, installing a support frame and a guide beam on the auxiliary piles 61, and then alternately inserting the tubular piles 31 and the sheet piles 32 on the riverbed 1 by means of the guide beam guide until the tubular piles are connected end to form the cofferdam 3.
After the cofferdam 3 is installed in place, the supporting frames and the guide beams are detached, the first layer of enclosing purlin 71 and the inner support modules 7 positioned on the enclosing purlin 71 are installed, and after the water pumping is completed, other layers of enclosing purlins 71 and the corresponding inner support modules 7 are installed downwards layer by layer.
After the construction of the purlin 71 is completed, the top of the cofferdam 3 is leveled through the pad beams 4, the cofferdam 3 is used as a pile foundation of the drilling platform 5, the bearing beams, the Bailey beams 52, the distribution beams 53 and the panels 54 are sequentially installed to form the drilling platform 5, and the drilling machine is arranged on the drilling platform 5 to construct a pile foundation in place, so that the pile foundation works in a dry environment.
Compared with the prior art, the scheme of the invention has the following advantages:
according to the embodiment, the cofferdam 3 piles are used as the foundation of the drilling platform 5, the cofferdam 3 and the drilling platform 5 form an integrated structure, the purpose of structure sharing is achieved, material investment is saved, operation procedures are reduced, construction cost is reduced, and the efficiency is improved.
Simultaneously, the construction sequence of the pile foundation after the water pumping of the cofferdam 3 is matched, a closed environment can be formed firstly, so that the construction of the pile foundation on water does not need to be provided with an over-long steel pile casing, the water head pressure difference does not need to be considered in the drilling process, the cost can be saved for the construction of the pile foundation on water with the water source protection requirement, the environmental protection requirement can be met, and the construction guarantee is provided.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The cofferdam and drilling platform integrated system comprises a cofferdam and an auxiliary supporting module, wherein the cofferdam and the auxiliary supporting module are inserted on a riverbed, and the auxiliary supporting module is positioned on the inner side of the cofferdam; the pad beam is respectively connected with the bottom of the drilling platform and the top of the cofferdam, and the top of the auxiliary support module and the top surface of the pad beam are at the same horizontal height and are connected with the bottom of the drilling platform; the auxiliary support module is located at the center of the drilling platform.
2. The cofferdam and drilling platform integrated system as claimed in claim 1, wherein the drilling platform comprises a panel, a plurality of beret beams and a pile top bearing beam, the panel, the beret beams and the pile top bearing beam are sequentially connected from top to bottom, the beret beams and the pile top bearing beam are arranged in a staggered manner, and two ends of the pile top bearing beam are respectively connected with the top surfaces of two opposite sides of the pad beam.
3. The cofferdam and drilling platform integrated system of claim 2 wherein at least two of said pile top beams are positioned opposite the top surface of the side walls on opposite sides of the cofferdam, at least one of said pile top beams being connected to the top of the auxiliary support module.
4. The cofferdam and drilling platform integrated system of claim 2, wherein said drilling platform further comprises a distribution beam arranged between beret beams and panels; the distribution beams and the Bailey beams are arranged in a staggered mode, and the distribution beams are connected with the bottom face of the panel and the top face of the Bailey beams respectively.
5. Cofferdam and drilling platform integrated system according to claim 2, wherein said auxiliary support modules comprise at least two auxiliary piles for being inserted on the river bed; and at least two pile top bearing beams are respectively connected with the top ends of the corresponding auxiliary piles.
6. The cofferdam and drilling platform integrated system of claim 5, wherein a plurality of said auxiliary piles are arranged in a rectangular configuration, said auxiliary piles are symmetrically arranged on opposite sides, and the top ends of two symmetrically arranged auxiliary piles are connected with a corresponding one of said pile top bearing beams.
7. The cofferdam and drilling platform integrated system of claim 5, wherein said auxiliary support module further comprises a first support; and two ends of the first supporting piece are respectively connected with the adjacent auxiliary piles.
8. The cofferdam and drilling platform integrated system of claim 1, further comprising an inner support module; the inner support module comprises an enclosing purlin and a plurality of second support pieces, the enclosing purlin is arranged along the inner wall of the cofferdam in a surrounding mode, the second support pieces are located on the inner side of the enclosing purlin, the second support pieces correspond to the inner walls of the two adjacent sides of the enclosing purlin, and the outer side wall of the enclosing purlin is connected with the inner side wall of the cofferdam.
9. The cofferdam and drilling platform integrated system as claimed in claim 1, wherein the cofferdam comprises tubular piles and sheet piles inserted on the riverbed for inserting, the tubular piles and sheet piles are arranged alternately and are enclosed end to form the cofferdam.
10. The application construction method of the cofferdam and drilling platform integrated system is characterized in that based on the application construction steps of the cofferdam and drilling platform integrated system as claimed in any one of claims 1-9:
inserting cofferdams and auxiliary supporting modules which are used for being inserted on the riverbed;
the top surface of the pad beam and the top of the auxiliary supporting module are at the same horizontal height;
building a drilling platform, and building the drilling platform on the top surface of the pad beam and the top of the auxiliary support module;
and draining accumulated water in the cofferdam, and performing pile foundation construction in the cofferdam through the drilling platform.
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| CN202210910642.XA CN115324086A (en) | 2022-07-29 | 2022-07-29 | Cofferdam and drilling platform integrated system and application construction method thereof |
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| CN214993149U (en) * | 2021-04-07 | 2021-12-03 | 中交第二航务工程局有限公司 | Integrated construction platform for pile foundation drilling and steel sheet pile cofferdam leading hole |
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