CN113653089A - Construction method of underwater large-volume steel sleeve box bearing platform - Google Patents
Construction method of underwater large-volume steel sleeve box bearing platform Download PDFInfo
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- CN113653089A CN113653089A CN202110983453.0A CN202110983453A CN113653089A CN 113653089 A CN113653089 A CN 113653089A CN 202110983453 A CN202110983453 A CN 202110983453A CN 113653089 A CN113653089 A CN 113653089A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 181
- 239000010959 steel Substances 0.000 title claims abstract description 181
- 238000010276 construction Methods 0.000 title claims abstract description 64
- 239000004567 concrete Substances 0.000 claims abstract description 56
- 238000007789 sealing Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000725 suspension Substances 0.000 claims abstract description 18
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 description 14
- 230000003014 reinforcing effect Effects 0.000 description 13
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 12
- 235000017491 Bambusa tulda Nutrition 0.000 description 12
- 241001330002 Bambuseae Species 0.000 description 12
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 12
- 239000011425 bamboo Substances 0.000 description 12
- 230000008093 supporting effect Effects 0.000 description 12
- 230000001681 protective effect Effects 0.000 description 7
- 238000005086 pumping Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000007788 roughening Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005728 strengthening Methods 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
- 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/40—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds in open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The application relates to the field of engineering construction, in particular to a construction method of a large-volume steel sleeve box bearing platform in water, which comprises the following steps: step 1, building a temporary trestle and a construction platform; step 2, constructing the steel casing and the pile foundation; step 3, assembling the steel sleeve box: step 301, mounting a bottom plate; step 302, mounting a side die; step 4, installing the lowering system and the suspension structure: step 401, installing a lowering system; step 402, mounting a suspension structure; step 5, dismantling the platform; step 6, sealing the bottom of the concrete; step 7, breaking redundant steel pile casings and pile heads; step 8, installing steel bars; and 9, pouring concrete of the bearing platform, and curing and forming. This application has the construction operation and need not to go on at aquatic environment, construction convenience's effect.
Description
Technical Field
The invention relates to the field of engineering construction, in particular to a construction method of a large-volume steel sleeve box bearing platform in water.
Background
In recent years, Shenzhen city urban rail transit is rapidly developed, a Shenzhen subway 11 number line is used as an airport express line, the whole journey is 51 kilometers, only 17 stations are arranged, 11 kilometers are arranged on the ground, and the design speed per hour reaches 120 kilometers. Among them, since the T3 terminal is located on the sea surface in the west of the front, the subway line must be "launched" from the land and then turned west on the sea surface.
As coastal engineering needs to pass through a sea area, the overhead of the Shenzhen subway No. 11 line Biji section needs to pass through fairways on two sides of a three-dimensional wharf, and therefore underwater bearing platforms and piers located on two sides of the fairways need to be constructed in the construction process.
The construction of the current underwater bearing platform usually needs to be carried out in the water environment in water, which is easy to cause inconvenience to the construction operation, so that the improvement space is still left.
Disclosure of Invention
In order to make the construction operation of aquatic cushion cap more simple and convenient, this application provides a bulky steel pouring jacket cushion cap construction method in aquatic.
The application provides a construction method for a large-volume steel pouring jacket bearing platform in water, which adopts the following technical scheme:
a construction method of a large-volume steel sleeve box bearing platform in water is characterized by comprising the following steps: the method comprises the following steps:
step 1, building a temporary trestle and a construction platform;
a steel casing is arranged on the construction platform in a driving mode, and concrete is poured into the steel casing to form a pile foundation;
step 301, mounting a bottom plate: firstly, hoisting a concrete prefabricated bottom plate onto a construction platform, splicing a plurality of dry concrete prefabricated bottom plates to form a bottom plate, fixing the bottom plate on a steel casing, and reserving pile holes for the steel casing to pass through on the bottom plate;
step 302, side die installation: assembling side molds at the periphery of the bottom plate, enabling the side molds to surround the bottom plate, and plugging splicing gaps of the side molds;
and 4, installing the lowering system and the suspension structure, specifically as follows:
step 401, installing a lowering system: installing a support upright post at the top end of the pile foundation steel casing, enabling the top end of the support upright post to be higher than the top end of the side mold, fixing a plurality of criss-cross section steels at the top end of the support upright post, and fixing a driving piece for driving the side mold to be lowered on the section steels to form a lowering system;
step 402, mounting a suspension structure: fixing a hoisting support rod at the top corner of the top end of the side mold, so that the hoisting support rod and the top corner of the side mold form a triangle to form a suspension structure;
and 5, disassembling the platform, which specifically comprises the following steps:
acting on the suspension structure by using a lifting device, lifting the side mould part, and then dismantling the construction platform;
and 6, sealing the bottom with concrete, which comprises the following steps:
driving the side mold to be lowered to a designed position by using a driving piece, sealing a gap between the bottom plate and the steel casing by using a water stop material and concrete, dismantling a lowering system after the concrete meets the strength design requirement, pumping out water in the steel pouring jacket, binding bottom-sealing reinforcing steel bars on the bottom plate, pouring bottom-sealing concrete to the fixed positions of the bottom-sealing reinforcing steel bars, fixing the bottom-sealing reinforcing steel bars on the bottom plate, leveling the upper surface of the bottom-sealing concrete, and finishing bottom sealing of the bearing platform;
step 7, breaking redundant steel pile casings and pile heads;
step 8, installing steel bars;
and 9, pouring concrete of the bearing platform, and curing and forming.
Through adopting above-mentioned technical scheme, after assembling the steel pouring jacket on construction platform, can accomplish construction platform's dismantlement through hoisting accessory with the side form part of hoisting, the rethread hoisting accessory side form can carry out subsequent back cover and pour the operation for the overall process all can go on in anhydrous environment, and makes construction platform's dismantlement more convenient.
The construction of the temporary trestle and the construction platform create a waterless environment for the assembly of the steel pouring jacket, which is beneficial to improving the construction efficiency; meanwhile, the temporary trestle and the construction platform are combined with the pile foundation to serve as a temporary supporting system, so that the supporting effect of the construction platform is safer and more reliable, the pile foundation does not need to be disassembled subsequently, and the construction operation is simpler and more convenient.
The construction of interim trestle and construction platform provides good installation environment for the installation of bottom plate and side form for a plurality of prefabricated bottom plates of bottom plate accessible are assembled on-the-spot and are formed, make the transportation of bottom plate more convenient, and simultaneously, make the bottom plate be difficult to damage in the transportation more.
Preferably, in step 301, reinforcing steel bar heads welded to adjacent prefabricated base plates are reserved at the edges of the plurality of prefabricated base plates, and after the plurality of prefabricated base plates are hung on the construction platform, post-pouring wet joints of 100 and 120cm are reserved between the adjacent prefabricated base plates.
Through adopting above-mentioned technical scheme, get up through the reinforcing bar head welding that stretches out between adjacent prefabricated bottom plate to pour the concrete in the seam backward, can accomplish the concatenation of bottom plate, easy and simple to handle, simultaneously, still be favorable to reinforcing the firm in connection degree between the adjacent prefabricated bottom plate, make the bottom plate bear the pressure of cushion cap better, make the bottom plate be difficult to the condition that the fracture appears more.
Preferably, in step 301, two layers of reinforcing mesh are pre-embedded in the prefabricated base plate, and the distance between the two layers of reinforcing mesh is 13-18 cm.
Through adopting above-mentioned technical scheme, be favorable to strengthening the intensity of bottom plate to be favorable to the bottom plate to provide the holding power for the cushion cap better, make the bottom plate be difficult to the condition that the fracture appears when bearing the pressure of cushion cap more.
Preferably, in step 301, a steel plate is pre-embedded in the prefabricated base plate, section steel is also pre-embedded in the steel casing, and the base plate and the steel casing are welded with the section steel through the steel plate to be fixedly connected.
Through adopting above-mentioned technical scheme, utilize shaped steel further to improve the steel and protect the joint strength between a section of thick bamboo and the bottom plate for the back is transferred to the side form, and the bottom plate is difficult more to protect a separation and the condition that the come-up appears with the steel, makes subsequent back cover and pours the operation simpler and more convenient.
Preferably, in step 301, when the prefabricated bottom plate is lowered, a gap between the outer side wall of the steel casing and the wall of the pile hole on the prefabricated bottom plate is reserved by 5-10 cm.
Through adopting above-mentioned technical scheme for the bottom plate is more difficult to appear scraping the condition that the steel protected a section of thick bamboo transferring the in-process, makes the operation of transferring of bottom plate more simple and convenient, simultaneously, still makes bottom plate and steel protect a section of thick bamboo more difficult wearing and tearing mutually.
Preferably, in step 401, the driving members are jacks.
Through adopting above-mentioned technical scheme, utilize a plurality of jacks as the driving piece, be favorable to transferring the overall stability of system transferring the in-process, still be favorable to improving and transfer the precision for the operation of transferring of side form is more accurate, more simple and convenient.
Preferably, in step 402, after the suspension structure is installed, criss-cross support beams and diagonal braces are installed on the inner sides of the side molds to form the inner support structure.
Through adopting above-mentioned technical scheme, interior bearing structure is favorable to improving the stability of side form to be favorable to improving the overall stability that the side form transferred the in-process, make between the different curb plates transfer the in-process and be difficult to appear relative displacement more, thereby be favorable to improving better and transfer the precision.
Preferably, in step 6, before the driving side mold is lowered, the guide plate is attached to the periphery of the bottom plate and abuts against the inner side of the side mold.
Through adopting above-mentioned technical scheme for the side form can be along the deflector motion transferring the in-process, makes the side form be difficult to take place the skew after transferring, thereby is favorable to the side form to surround the bottom plate all the time better and provides better operational environment for the operation that back cover and cushion cap were pour.
Preferably, in the step 6, after the gap between the bottom plate and the steel casing is sealed by the water-stop material and the concrete, a plurality of connecting steel plates for fixing the prefabricated bottom plate and the steel casing are welded in the circumferential direction of the steel casing.
Preferably, in the step 6, the connecting steel plates are arranged into 6-9 blocks, and the connecting steel plates are uniformly distributed along the circumferential direction of the steel casing.
By adopting the technical scheme, the connecting steel plate is beneficial to further improving the connection stability of the bottom plate and the steel casing, so that the bottom plate is more difficult to separate from the steel casing to float; simultaneously, the bearing of bottom plate still is favorable to better through connecting steel sheet transmit to the steel protect a section of thick bamboo for the steel protects a common bearing with the bottom plate, thereby is favorable to improving the bearing capacity of bottom plate and the cushion cap of pouring shaping better, makes the condition of the fracture more difficult to appear when bottom plate and cushion cap bear the pressure of bridge.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the bottom plate is assembled on the construction platform, the side mold is installed, the side mold is partially lifted through the lifting device, the side mold is placed downwards, the bottom sealing and the bearing platform pouring are completed, the construction of the bearing platform in water is completed, the operation is simple and convenient, the whole process is carried out in a waterless environment, and the construction difficulty is greatly reduced.
2. Through assembling the steel sleeve box on site, the steel sleeve box is more convenient to transport, and the transportation space is saved, so that the transportation cost is reduced.
3. Through pre-buried reinforcing bar in prefabricated bottom plate, and it is fixed to weld mutually and pour concrete through the reinforcing bar head of reserving between the adjacent prefabricated bottom plate, be favorable to improving the intensity of bottom plate better for the bearing capacity of bottom plate is better, makes the condition of fracture more be difficult to appear in the bottom plate.
4. Through protect a section of thick bamboo circumference pre-buried shaped steel and the connecting steel plate of being connected with the bottom plate at the steel, be favorable to improving the connection steadiness between the bottom plate and the steel protects a section of thick bamboo, make the bottom plate be difficult to appear more and protect a condition that breaks away from and come up with the steel and protect a section of thick bamboo, and simultaneously, the bearing that still does benefit to the bottom plate passes through shaped steel and connecting steel plate dispersion to the steel better and protects a section of thick bamboo, be favorable to improving the bearing capacity of bottom plate and cushion cap better, make the condition that the fracture appears more difficult to when the weight of bridge is born to bottom plate and cushion cap.
Drawings
Fig. 1 is a schematic view of the overall structure of a base plate in the embodiment of the present application.
Fig. 2 is an elevation schematic view of a lowering system in an embodiment of the present application.
Figure 3 is a side schematic view of a lowering system in an embodiment of the present application.
Description of reference numerals:
1. a base plate; 11. prefabricating a bottom plate; 12. pile holes; 13. post-pouring wet seams; 2. side mould; 3. double-spliced 45a I-shaped steel; 31. supporting the upright post; 4. lowering the system; 41. an upper cross beam; 42. a stressed longitudinal beam; 43. a jack; 44. a split heads; 45. a steel plate 10mm thick; 5. a boom; 6. pile foundation.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a construction method of a large-volume steel sleeve box bearing platform. A construction method of a large-volume steel pouring jacket bearing platform comprises the following steps:
step 1, building a temporary trestle and a construction platform, specifically as follows:
and temporarily building a steel trestle and a steel platform for sea surface construction in water to serve as a channel and an operation platform for the whole construction.
drilling on the construction platform and establishing the protective cylinder hole, drilling and establishing the steel protective cylinder and making the steel protective cylinder run through the protective cylinder hole, and the steel protective cylinder part stretches out to the construction platform, then pouring concrete into the steel protective cylinder to form the pile foundation.
step 301, installing the bottom plate 1, specifically as follows:
referring to fig. 1, in the present embodiment, the prefabricated base plate 11 is prefabricated with C25 concrete and has a thickness of 35cm, the prefabricated base plate 11 is set to 6 blocks, and in other embodiments, the prefabricated base plate 11 may also be set to 4 blocks. Reinforcing steel bars are further embedded in the prefabricated bottom plates 11, the reinforcing steel bars are phi 20 threaded reinforcing steel bars, an upper layer of reinforcing steel bars and a lower layer of reinforcing steel bars are laid in each prefabricated bottom plate 11, the distance between the upper layer of reinforcing steel bars and the lower layer of reinforcing steel bars is 15cm, in other embodiments, the distance between the upper layer of reinforcing steel bars and the lower layer of reinforcing steel bars can also be 13cm, 14cm, 16cm, 17cm and 18cm, and the reinforcing steel bars all extend out of the prefabricated bottom plates 11 to form reserved reinforcing steel bar heads. The prefabricated bottom plate 11 is also provided with a pile hole 12 for the steel casing to pass through, the radius of the pile hole 12 is 7cm larger than that of the steel casing, and in other embodiments, the radius of the pile hole 12 can be 5cm, 6cm, 8cm, 9cm and 10cm larger than that of the steel casing.
The prefabricated bottom plates 11 are firstly hung on a construction platform, in the embodiment, the distance between the adjacent prefabricated bottom plates 11 is 110cm so as to form the post-pouring wet joint 13, in other embodiments, the distance between the adjacent prefabricated bottom plates 11 can also be 100cm, 101cm, 102cm, 103cm, 104cm, 105cm, 115cm, 116cm, 117cm, 118cm, 119cm, 120cm and the like. And then pouring concrete into the wet joints 13, and splicing the plurality of prefabricated bottom plates 11 into the bottom plate 1.
The circumference that the section of thick bamboo was protected to the steel still is fixed with a plurality of shaped steel that are used for connecting bottom plate 1 and a section of thick bamboo is protected to the steel, and a plurality of shaped steel are along the circumference evenly distributed that the section of thick bamboo was protected to the steel, and prefabricated bottom plate 11 is last still pre-buried to have a plurality of 15cm wide, the steel sheet that 2cm is thick, and a plurality of steel sheets and a section of thick bamboo one-to-one are protected to the steel, and in this embodiment, shaped steel and steel sheet are all established to four. When the prefabricated bottom plate 11 is hung on the construction platform, the steel plate is abutted to the section steel. After concrete is poured between the adjacent prefabricated bottom plates 11, the bottom plate 1 and the section steel can be fixed by welding the positions of the steel plates abutted to the section steel.
Step 302, installing the side die 2, specifically as follows:
assembling the side moulds 2 on the periphery of the bottom plate 1, mounting one side mould 2 from an angular point, mounting the other side mould 2 connected with the side mould 2 to form a stable structure, and symmetrically mounting the two side moulds 2 at the other angular point to enable the side moulds 2 to form a square frame and surround the periphery of the bottom plate 1.
And (3) blocking splicing gaps of the side mold 2 by using rubber sheets, and blocking all reserved pull rod holes by using water-swelling water stop strips.
In this embodiment, the specification of each side plate of the side mold 2 is as follows: the panel is 8mm thick steel plate, and the vertical rib is 300 × 150 mm's H shaped steel, and the interval between adjacent vertical rib is 100cm, and main transverse rib is 32b channel-section steel and 12mm thick steel sheet, and the angle steel of 63 × 6mm is regarded as the secondary transverse rib.
Step 4, installing the lowering system 4 and the suspension structure, specifically as follows:
step 401, installing the lowering system 4, specifically as follows:
referring to fig. 2 and 3, a double-spliced 45a i-beam 3 is arranged at the top end of a steel casing of a pile foundation 6, the double-spliced 45a i-beam 3 and the steel casing are welded to be fixed by a triangular steel plate, and then C25 concrete is filled in the residual space in the steel casing. And then, placing the supporting upright 31 on the double-spliced 45a I-shaped steel 3, so that the top end of the supporting upright 31 is higher than that of the side die 2. In this embodiment, the supporting column 31 is a steel pipe with a diameter of 609 × 16mm, and the supporting column 31 is located at the center of the steel casing and is welded and fixed with the double-spliced 45a h-shaped steel 3.
Then, a plurality of criss-cross section steels are fixed at the top ends of the supporting columns 31, and driving pieces for driving the side molds 2 to be lowered are fixed on the section steels to form a lowering system 4. In this embodiment, the following are specifically mentioned: an upper cross beam 41 is welded at the top end of the supporting upright column 31, the upper cross beam 41 is a double-spliced 45a I-shaped steel 3, and a steel plate 45 with the thickness of 10mm is adopted at the upright column position to reinforce the double-spliced 45a I-shaped steel 3. And then welding a stressed longitudinal beam 42 on one side of the upper cross beam 41, which is far away from the upright column, wherein the stressed longitudinal beam 42 is made of 4-spliced 63a section steel, a fine rolling screw-thread steel is penetrated through the middle of the 4-spliced 63a section steel at a reserved interval of 60mm, and a steel plate with the length of 700 x 500 x 30mm and the 4-spliced 63a section steel are welded into a whole at the position of a lifting point. In addition, the steel plates 700 x 200 x 10mm are welded with the section steel of the 4-piece jig 63a integrally at the beam ends and the beam center, and the steel plates 45 with the thickness of 10mm are used for ribbing the section steel of the 4-piece jig 63a at the hanging point position, the large transverse beam position and the midspan position, and the spacing is 20 cm.
In this embodiment, the driving members are 6 jacks 43 fixed to the stressed longitudinal beam 42. And a horse stool 44 for placing a jack 43 is fixed on one side of the stressed longitudinal beam 42 close to the upper cross beam 41, a steel plate 350 x 30mm is fixed on the jack 43, an anchorage device is fixed on the steel plate, and a suspender 5 for pulling the side die 2 to move is further arranged on the anchorage device. The hanger rod 5 is made of finish-rolled deformed steel bar with the diameter of 32mm, and a single hanging strip is allowed to bear the load of 74.8 t.
Step 402, mounting a suspension structure and an inner support structure, specifically as follows:
the hoisting support rods are fixed at the top corners of the top ends of the side dies 2, so that the hoisting support rods and the top corners of the side dies 2 form triangles to form a suspension structure, and in the embodiment, the hoisting support rods are double-spliced 45a I-shaped steel 3.
And then, criss-cross supporting beams and inclined struts are arranged on the inner side of the side die 2 to form an inner supporting structure, in the embodiment, the supporting beams and the inclined struts are all steel pipes with the diameter of 300mm, and the wall thickness is 6 mm.
And 5, disassembling the platform, which specifically comprises the following steps:
and (3) acting on the hoisting support rod by using a hoisting device, lifting the side die 2 part, and then dismantling the construction platform.
And 6, sealing the bottom with concrete, which comprises the following steps:
the periphery of the bottom plate 1 is provided with a guide plate, the guide plate surrounds the edge position of the bottom plate 1, the guide plate protrudes out of the upper surface of the bottom plate 1, the guide plate is perpendicular to the bottom plate 1, the protruding height of the guide plate is 20cm, and the outer side of the guide plate is abutted to the inner side of the side mold 2.
Then, a jack 43 is used for driving the side die 2 to be lowered to a designed position, two suspension rods 5 are fixed on each hoisting support rod, so that the side die 2 is suspended and is in a stable suspension state, and then the gap between the bottom plate 1 and the steel casing is blocked by using plastic foam and concrete.
Welding a plurality of connecting steel plates in the range of the bottom sealing concrete of the outer side wall of the steel casing, and enabling the plurality of connecting steel plates to be uniformly distributed along the circumferential direction of the steel casing, wherein in the embodiment, the number of the connecting steel plates is 8, and in other embodiments, the number of the connecting steel plates can be 6, 7 or 9; the thickness of the connecting steel plate is 10mm, the height is 300mm, the width is 300mm, and the welding thickness of the connecting steel plate and the steel casing is not less than 8 mm.
And (3) after the concrete meets the strength design requirement, removing the downward placing system 4, pumping water in the steel pouring jacket by using a water pump, and if the situation of local water leakage occurs in the water pumping process, pumping water and blocking leakage.
After water pumping is finished, roughening the surface of the prefabricated bottom plate 11, binding bottom-sealing reinforcing steel bars on the bottom plate 1, pouring bottom-sealing concrete with the height of 65cm, wherein the bottom-sealing concrete is C25 underwater concrete, enabling the bottom-sealing concrete and the bottom plate 1 with the thickness of 35cm to form a reinforced concrete bottom plate 1 with the thickness of 100cm, bearing the construction weight of a bearing platform together, transmitting the weight of the bearing platform to a steel protective cylinder through a connecting steel plate by the bottom plate 1, and leveling the upper surface of the bottom-sealing concrete during bottom sealing.
After the bottom sealing concrete reaches the strength requirement and no quality problem occurs, the suspension structure is disassembled, the anchor device 5 of the suspender is gradually loosened, the change condition of the steel pouring jacket is observed at any time, if serious water leakage or sinking phenomenon occurs, the disassembly is stopped, and the disassembly operation is continued after the problem is solved.
And 7, breaking redundant steel pile casings and pile heads, specifically comprising the following steps:
and after the bottom sealing construction is finished, cutting off redundant steel pile casings extending out of the reinforced concrete bottom plate 1, then manually matching with a machine to chisel off pile heads, and clearing away the pile head concrete to the designed elevation and ensuring that the concrete reaches a fresh surface.
And after the pile head is processed, cleaning and adjusting the pile head reinforcing steel bars.
And 8, installing the steel bars, specifically as follows:
lay the reinforcing bar net according to the design requirement successive layer, because the reinforcing bar quantity is great, the net and the level of reinforcing bar are more, in order to guarantee the correct placing of design reinforcing bar, except erectting the reinforcing bar, erect each layer reinforcing bar net piece with the special locating rack of reinforcing bar for upper and lower layer grid aligns, and the interlamellar spacing is correct.
After the steel bars are installed, embedded parts such as temporary anchoring embedded steel bars, cooling pipes and the like are installed in time.
Step 9, pouring concrete of the bearing platform, and curing and forming, wherein the concrete steps are as follows:
all material equipment is checked firstly, so that the equipment is ensured to have a good working state, whether pile heads are cleaned up is checked, whether the positioning of embedded steel bars is accurate and firm is checked, and whether the positions of corresponding embedded parts are accurate is checked.
And pouring the concrete from the middle part of the bearing platform to the two ends simultaneously when pouring the concrete, and performing layered construction according to the height of 30cm in order to prevent the concrete from initially setting in the pouring process, and roughening the surface of the concrete after pouring the concrete to the height of 1.5 m. And then before the next section of concrete is poured, a delayed coagulation water flushing method is adopted to wash the contact surface of the concrete completely, cement mortar and a loose layer on the surface of the concrete are removed, and a layer of cement paste is spread before the next section of concrete is poured, so that the connection between the two layers is enhanced.
And after the last section of concrete is poured, compacting and leveling the concrete before the initial setting of the top concrete, and curing and forming the concrete, thereby finishing the construction of the large-volume steel pouring jacket bearing platform in the water.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A construction method of a large-volume steel sleeve box bearing platform in water is characterized by comprising the following steps: the method comprises the following steps:
step 1, building a temporary trestle and a construction platform;
and 2, constructing the steel casing and the pile foundation (6) as follows:
a steel casing is arranged on the construction platform in a striking mode, and concrete is poured into the steel casing to form a pile foundation (6);
step 3, assembling the steel sleeve box, specifically as follows:
step 301, installing a bottom plate (1): firstly, hoisting a concrete prefabricated bottom plate (11) to a construction platform, splicing a plurality of dry concrete prefabricated bottom plates (11) to form a bottom plate (1), fixing the bottom plate (1) on a steel casing, and reserving a pile hole (12) for the steel casing to pass through on the bottom plate (1);
step 302, installing a side die (2): assembling side dies (2) at the periphery of the bottom plate (1), enabling the side dies (2) to surround the bottom plate (1), and plugging splicing gaps of the side dies (2);
and 4, installing the lowering system (4) and the suspension structure, specifically as follows:
step 401, installing a lowering system (4): mounting a support upright post (31) at the top end of a steel casing of a pile foundation (6) to enable the top end of the support upright post (31) to be higher than the top end of the side mold (2), fixing a plurality of criss-cross section steels at the top end of the support upright post (31), and fixing a driving piece for driving the side mold (2) to be lowered on the section steels to form a lowering system (4);
step 402, mounting a suspension structure: a hoisting support rod is fixed at the top corner of the top end of the side mold (2), so that the hoisting support rod and the top corner of the side mold (2) form a triangle to form a suspension structure;
and 5, disassembling the platform, which specifically comprises the following steps:
acting on the suspension structure by using a lifting device, lifting the side mould (2) part, and then dismantling the construction platform;
and 6, sealing the bottom with concrete, which comprises the following steps:
the driving part is used for driving the side die (2) to be lowered to a designed position, a gap between the bottom plate (1) and the steel casing is sealed by water-stop materials and concrete, after the concrete meets the strength design requirement, the lowering system (4) is disassembled, water in the steel pouring jacket is pumped out, then bottom-sealing reinforcing steel bars are bound on the bottom plate (1), bottom-sealing concrete is poured to the fixed positions of the bottom-sealing reinforcing steel bars, the bottom-sealing reinforcing steel bars are fixed on the bottom plate (1), the upper surface of the bottom-sealing concrete is leveled, and bottom sealing of the bearing platform is completed;
step 7, breaking redundant steel pile casings and pile heads;
step 8, installing steel bars;
and 9, pouring concrete of the bearing platform, and curing and forming.
2. The construction method of the underwater large-volume steel pouring jacket bearing platform according to claim 1, characterized in that: in the step 301, reinforcing steel bar heads welded with the adjacent prefabricated bottom plates (11) are reserved at the edges of the plurality of prefabricated bottom plates (11), and after the plurality of prefabricated bottom plates (11) are hung on the construction platform, post-pouring wet joints (13) of 100cm and 120cm are reserved between the adjacent prefabricated bottom plates (11).
3. The construction method of the underwater large-volume steel pouring jacket bearing platform according to claim 2, characterized in that: in the step 301, two layers of reinforcing steel bar nets are pre-embedded in the prefabricated base plate (11), and the distance between the two layers of reinforcing steel bar nets is 13-18 cm.
4. The construction method of the underwater large-volume steel pouring jacket bearing platform according to claim 2, characterized in that: in the step 301, a steel plate is pre-embedded in the prefabricated bottom plate (11), section steel is also pre-embedded in the steel casing, and the bottom plate (1) and the steel casing are fixedly connected with the section steel through welding of the steel plate.
5. The construction method of the underwater large-volume steel pouring jacket bearing platform according to claim 4, characterized in that: in the step 301, when the prefabricated bottom plate (11) is lowered, 5-10cm is reserved in a gap between the outer side wall of the steel casing and the wall of a pile hole (12) in the prefabricated bottom plate (11).
6. The construction method of the underwater large-volume steel pouring jacket bearing platform according to any one of claims 1 to 5, wherein: in step 401, the driving members are jacks (43).
7. The construction method of the underwater large-volume steel pouring jacket bearing platform according to any one of claims 1 to 5, wherein: in the step 402, after the suspension structure is installed, criss-cross support beams and diagonal braces are installed on the inner side of the side mold (2) to form an inner support structure.
8. The construction method of the underwater large-volume steel pouring jacket bearing platform according to any one of claims 1 to 5, wherein: in the step 6, before the driving side die (2) is lowered, the guide plate is arranged on the periphery of the bottom plate (1) and is abutted against the inner side of the side die (2).
9. The construction method of the underwater large-volume steel pouring jacket bearing platform according to any one of claims 1 to 5, wherein: in the step 6, after the gap between the bottom plate (1) and the steel casing is sealed by using the water-stop material and the concrete, a plurality of connecting steel plates for fixing the prefabricated bottom plate (11) and the steel casing are welded in the circumferential direction of the steel casing.
10. The construction method of the underwater large-volume steel pouring jacket bearing platform according to claim 9, characterized in that: in the step 6, the number of the connecting steel plates is 6-9, and the connecting steel plates are uniformly distributed along the circumferential direction of the steel casing.
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| CN113152505A (en) * | 2021-02-19 | 2021-07-23 | 中交第二公路工程局有限公司 | Construction method of underwater super-large scale bearing platform combined casing box enclosure structure with partial bottom sealing |
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- 2021-08-25 CN CN202110983453.0A patent/CN113653089A/en active Pending
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| CN106869150A (en) * | 2017-01-24 | 2017-06-20 | 中国建筑第六工程局有限公司 | Double-wall steel suspension box installing force system conversion method |
| CN107447767A (en) * | 2017-08-10 | 2017-12-08 | 重庆水利电力职业技术学院 | A kind of prefabricated reinforced concrete bottom plate steel lifted trunk and its construction method |
| CN110439013A (en) * | 2019-07-29 | 2019-11-12 | 重庆弘粟建筑科技有限公司 | A kind of main pier bearing platform steel suspended box cofferdam construction method |
| CN113152505A (en) * | 2021-02-19 | 2021-07-23 | 中交第二公路工程局有限公司 | Construction method of underwater super-large scale bearing platform combined casing box enclosure structure with partial bottom sealing |
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Application publication date: 20211116 |