CN116905534A - Assembled cofferdam structure and cofferdam construction method - Google Patents
Assembled cofferdam structure and cofferdam construction method Download PDFInfo
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- CN116905534A CN116905534A CN202310806670.1A CN202310806670A CN116905534A CN 116905534 A CN116905534 A CN 116905534A CN 202310806670 A CN202310806670 A CN 202310806670A CN 116905534 A CN116905534 A CN 116905534A
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- 238000010276 construction Methods 0.000 title claims abstract description 55
- 238000007789 sealing Methods 0.000 claims abstract description 61
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 240000004282 Grewia occidentalis Species 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000007667 floating Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
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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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Abstract
The invention discloses an assembled cofferdam structure and a cofferdam construction method, which have the advantages of simple construction operation and short period, and particularly can be used reversely and quickly, so as to meet the requirements of the quick construction method. The assembled cofferdam structure comprises a pile foundation, a bottom die, a side die and a hoisting mechanism; the bottom die comprises a sectional type supporting plate, a plurality of floating boxes and a plugging ring plate, wherein the sectional type supporting plate is respectively arranged on a middle plate between pile foundations and a side plate detachably connected with the middle plate; the side plates are designed in a sectional mode and comprise a bottom sealing side plate of a lower section and a bearing platform side plate of an upper section, wherein the bearing platform side plate is detachably connected with the bottom sealing side plate, and the bottom sealing side plate is detachably connected with the supporting plate; the hoisting mechanism is connected with the pile foundation and the bottom die. During construction, the bottom die is assembled firstly, then the bottom die is hoisted, the bottom sealing side plates are installed, then bottom sealing concrete is poured, after the bottom sealing concrete meets the strength requirement, the bottom die is disassembled, the bearing platform side plates are assembled, bearing platform construction is carried out, then the side dies are disassembled, and the bottom die and the side dies can be used in a transferring mode after being disassembled.
Description
Technical Field
The invention relates to the technical field of cofferdam construction, in particular to an assembled cofferdam structure and a cofferdam construction method.
Background
The cofferdam is a temporary enclosure structure built for building a permanent hydraulic facility in hydraulic engineering construction. The cofferdam is used to prevent water and soil from entering the building construction site to drain water, excavate foundation pit, build buildings, etc. in the cofferdam, and is generally used mainly in hydraulic construction where the height of the cofferdam is higher than the highest water level that may occur during construction. The cofferdam generally needs to be removed after it is used up, unless it is part of a formal building.
Along with the continuous high-speed development of China in highway bridge industry for years, bridge construction increasingly spans sea areas such as Dajiang, sea and the like. The bridge span form of the offshore bridge in the non-navigation hole area is usually designed into a full-hole prefabricated box girder, the full-hole prefabricated box girder has the engineering characteristics of large number of bearing platforms, uniform structural dimension, water depth at pier positions and the like, if the common suspended box cofferdam is adopted for construction, a large number of cofferdam bottom plates are required to be put into water and cannot be recycled, and a hanging system is required to be put into the cofferdam for lowering and sealing the bottom, so that the full-hole prefabricated box girder has the defects of complex operation procedures, long construction period of the bearing platforms, high cost and the like.
Disclosure of Invention
The invention aims to provide an assembled cofferdam structure and a cofferdam construction method, which solve the problems in the prior art, have the advantages of simple construction operation and short period, and particularly can be used reversely conveniently and rapidly by a bottom die and a cofferdam so as to meet the requirements of a rapid construction method.
In order to achieve the above object, one of the solutions of the present invention is:
an assembled cofferdam structure comprises a pile foundation, a bottom die, side dies and a hoisting mechanism; the pile foundation is square in a four-corner position array; the circumference of the pile foundation pile casing is provided with a plurality of supporting brackets at equal height; the bottom die comprises a sectional type supporting plate, a plurality of buoyancy tanks and a plugging annular plate consisting of two semi-annular plates; the supporting plate comprises a rectangular middle plate positioned between pile foundations and two side plates arranged on the side edges of the middle plate, the middle plate is detachably connected with the side plates, the buoyancy tanks are arranged below the middle plate and the side plates, and the middle plate and the side plates are upwards abutted against top support brackets at corresponding positions under the buoyancy action of the buoyancy tanks; the side plates are provided with the U-shaped notch matched with the pile foundation; the plugging surrounding plate is embraced on the pile foundation and is matched with the upper surface of the middle plate and the side plates; the side die comprises a bottom sealing side plate, angle steel and a bearing platform side plate; the lower surface of the bottom sealing side plate is detachably connected to the upper surface of the supporting plate and encloses a cofferdam shape, and a plurality of horizontal pull rods are connected between the bottom sealing side plate and the pile foundation casing; the angle steel is connected to the inner side surface of the bottom sealing side plate along the horizontal direction; the bearing platform side plate is detachably connected to the upper surface of the bottom sealing side plate; the hoisting mechanism is arranged between the pile foundation pile casing and the upper surface of the bottom die, and plays a role in connection and fixation after the middle plate and the side plates are constructed in place.
The long edge of the middle plate is in clearance fit with the peripheral surface of the pile foundation.
The middle plate and the side plates are connected and fixed in a manner of finish rolling or bolt locking after being constructed in place.
The inner diameter of the plugging annular plate is matched with the outer diameter of the pile casing of the pile foundation.
The hoisting mechanism comprises a shoulder pole beam arranged on the circumferential surface of the protective cylinder and a suspender connected between the shoulder pole beam and the bottom die.
Sponge rubber is adhered between the middle plate and the side plates, between the middle plate and the bottom sealing side plate, and between the bottom sealing side plate and the bottom sealing side plate.
The second solution of the present invention is:
the cofferdam construction method is applied to the assembled cofferdam structure and comprises the following steps:
step 1, after the pile foundation construction is finished, installing the top support bracket and the hoisting mechanism on a pile casing of the pile foundation, and then dismantling a drilling platform;
step 2, firstly dragging the middle plate between two rows of pile foundations and temporarily anchoring the middle plate; then sequentially dragging side plates at two sides into the pile foundation from the outer side of the pile foundation, so that the notches of the side plates sleeve the pile foundation casing and temporarily anchor the pile foundation; then the middle plate and the side plates are connected into a whole; finally, the whole bottom die is lifted up through the lifting mechanism, so that the upper surfaces of the middle plate and the side plates are respectively abutted against the top supporting brackets at the corresponding positions;
step 3, assembling the bottom sealing side plates in sequence, and installing a horizontal pull rod on the bottom sealing side plates and screwing;
step 4, installing a plugging ring plate, a back cover concrete anchoring steel bar and a back cover concrete reinforcing steel bar net on the peripheral surface of the pile foundation casing, and pouring back cover concrete;
step 5, dismantling the bottom die, the top support bracket and the hoisting mechanism, and breaking the pile head;
step 6, splicing bearing platform side plates on the bottom sealing side plates in sequence, and installing a cofferdam inner support and a cross brace after splicing the bearing platform side plates;
and 7, carrying out bearing platform construction.
In the step 1, a crane is used for hoisting, the middle plate and the side plates with the buoyancy tanks are placed on the sea surface in sequence, and a pontoon is used for pulling in place.
The step 5 comprises the following steps: after the strength of the bottom sealing concrete meets the requirement, when the water level is above the upper surface of the supporting plate, the hoisting mechanism and the top supporting bracket are dismantled, so that the cofferdam floats on the water surface; the water surface is wetted to the upper surface of the supporting plate and slowly separated from the bottom of the back cover concrete, and the whole bottom die is pulled out by adopting a steel wire rope; cutting the pile casing of the pile foundation according to the designed elevation, and breaking the pile head.
The cofferdam construction method also comprises a step 8, wherein when pier construction is completed and the bearing platform concrete reaches more than 70% of design strength, the side mould can be removed, and the side mould is reused after being removed.
After the technical scheme is adopted, the invention has the following technical effects:
(1) the novel assembled suspended box cofferdam scheme is proposed on the basis of the existing cofferdam construction process, the bottom die is designed into a block assembly type, the side dies of the cofferdam are designed into segments according to the back cover thickness and the bearing platform height, the cofferdam is integrally designed into an assembled type, the time cost for installing the bottom die and the side dies can be reduced, the bottom die and the side dies can be repeatedly used, the input cost of the template can be greatly reduced, and the purposes of simplifying the working procedure and saving the cost are achieved;
(2) the size of the back cover side plate is small, quick installation can be realized before back cover concrete construction, when the back cover side plate is assembled later, the back cover concrete is hardened, the working face is fixed, the assembly of the large-scale back cover side plate is safer, the construction risk is reduced, and the back cover side plate can be customized to different heights according to different engineering requirements;
(3) the unique angle steel design at the inner side of the bottom sealing side plate can realize vertical limit of the bottom sealing side plate and the bottom sealing concrete, so that the connection strength of the bottom sealing side plate is improved, and the construction safety is further ensured;
(4) on the basis of the existing cofferdam construction process, the invention can form continuous and rapid operation by only adding part of the bottom sealing side plates, reduces the construction cost, shortens the total construction period, can greatly reduce project mechanical cost, management cost and other fixed expenditure, and can create larger economic benefit for projects.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of bottom mold blocking according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a construction process according to an embodiment of the present invention;
FIG. 4 is a second schematic illustration of a construction process according to an embodiment of the present invention;
FIG. 5 is a third schematic illustration of a construction process according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a construction process according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a construction process according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a construction process according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a construction process according to an embodiment of the present invention;
reference numerals illustrate:
1- - -pile foundation; 11-pile casing; 12- - -supporting bracket;
2- - -a bottom die; 21- - -a support plate; 211—a middle plate; 212—side plates; 2121-notch; 22-buoyancy tank; 23-plugging ring plate;
3- - -side mold; 31- - -a bottom sealing side plate; 32- - -angle steel; 33- - -a platform side plate;
4- - -a horizontal pull rod;
5- - -a shoulder pole beam;
6- -boom.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Accordingly, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in place when the inventive product is used, or the orientation or positional relationship conventionally understood by those skilled in the art, is merely for convenience in describing the embodiments of the present invention, and is not intended to indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Referring to fig. 1 and 2, the invention discloses an assembled cofferdam structure, which comprises a pile foundation 1, a bottom die 2, a side die 3 and a hoisting mechanism;
the number of pile foundations 1 is generally 4, and the pile foundations are square four-corner position arrays; the circumference of the pile casing 11 of the pile foundation 1 is provided with a plurality of supporting brackets 12 at equal height;
the bottom die 2 comprises a sectional type supporting plate 21, a plurality of buoyancy tanks 22 and a plugging annular plate 23 consisting of two semi-annular plates; the supporting plate 21 comprises a rectangular middle plate 211 positioned between pile foundations 1 and two side plates 212 arranged on the side edges of the middle plate 211, wherein the middle plate 211 is detachably connected with the side plates 212, floating boxes 22 are arranged below the middle plate 211 and the side plates 212, and the middle plate 211 and the side plates 212 are upwards abutted against the top supporting brackets 12 at corresponding positions under the buoyancy action of the respective floating boxes 22; side plates 212 are provided with U-shaped notches 2121 matched with pile foundation 1 so as to sleeve side plates 212 to the side edges of pile foundation 1 and connect with middle plate 211; the plugging annular plate 23 is embraced on the pile foundation 1 and is matched with the upper surfaces of the middle plate 211 and the side plates 212;
the side die 3 comprises a bottom sealing side plate 31, angle steel 32 and a bearing platform side plate 33; the lower surface of the bottom sealing side plate 31 is detachably connected to the upper surface of the supporting plate 21 and encloses a cofferdam shape, and a plurality of horizontal pull rods 4 are connected between the bottom sealing side plate 31 and the pile foundation 1 casing 11; the angle steel 32 is connected to the inner side surface of the bottom sealing side plate 31 along the horizontal direction; the bearing platform side plate 33 is detachably connected to the upper surface of the bottom sealing side plate 31, and the height of the bearing platform side plate 33 can be designed according to the specific height of the bearing platform;
the hoisting mechanism is arranged between the pile casing 11 of the pile foundation 1 and the upper surface of the bottom die 2, and plays a role in connection and fixation after the middle plate 211 and the side plates 212 are constructed in place.
A specific embodiment of the cofferdam structure described above is shown below.
The width D of the middle plate 211 is slightly smaller than the distance D between the adjacent pile foundations 1, that is, the long side of the middle plate 211 is in clearance fit with the peripheral surface of the pile foundations 1, so that the middle plate 211 can be quickly towed between the pile foundations 1 and is pre-positioned by means of floating pontoon towing and the like.
After the middle plate 211 and the side plates 212 are constructed in place, the middle plate and the side plates are connected and fixed in a manner of finish rolling or bolt locking and the like to form a whole; after the pouring of the back cover concrete is completed and the form removal strength is achieved, the finish rolled steel or bolts can be removed, so that the middle plate 211 and the side plates 212 are separated, and pulled out from the bottom of the back cover concrete in a floating pontoon dragging mode and the like for recycling.
The inner diameter of the plugging ring plate 23 is matched with the outer diameter of the casing 11 of the pile foundation 1. After the middle plate 211 and the side plates 212 are constructed in place and form the whole supporting plate 21, the plugging ring plate 23 is embraced on the peripheral surface of the pile foundation 1 and is matched with the supporting plate 21, so that the gap between the supporting plate 21 and the pile foundation 1 is plugged to achieve the purpose of leakage prevention, and the subsequent concrete pouring process can be performed.
The side plates 33 of the bearing platform are all large integral steel moulds, and the side mould 3 formed by the side plates 31 and 33 of the bottom sealing plate can be recycled.
The hoisting mechanism comprises a shoulder pole beam 5 arranged on the peripheral surface of the protective cylinder 12 and a suspender 6 connected between the shoulder pole beam 5 and the bottom die 2, and specifically, the suspender 6 can be connected with the supporting plate 21 or connected with a nut at the bottom of the buoyancy tank 22 through the supporting plate 21.
The middle plate 211 and the side plate 212, the middle plate 211 and the bottom sealing side plate 31, the bottom sealing side plate 31 and the bottom sealing side plate 31, and the seam between the bottom sealing side plate 31 and the bearing platform side plate 33 are respectively stuck with 8mm sponge rubber, and the sponge rubber is 2mm after being compressed so as to prevent the leakage of the surrounding weir.
The invention also discloses a cofferdam construction method, which comprises the following steps of:
step 1, referring to fig. 3, after the construction of the pile foundation 1 is finished, installing a top support bracket 12 and a hoisting mechanism on a pile casing 11 of the pile foundation 1, and then dismantling a drilling platform;
step 2, referring to fig. 4, first, the middle plate 211 is dragged into between two rows of pile foundations 1 and temporarily anchored; then the side plates 212 on two sides are dragged in from the outer side of the pile foundation 1 in sequence, so that the notches 2121 of the side plates 212 sleeve the pile foundation 1 casing 11 and are temporarily anchored; then the middle plate 211 and the side plates 212 are connected into a whole through a phi 32 IV-level finish rolling deformed steel bar; finally, the bottom die 2 is integrally lifted up through a lifting mechanism, so that the upper surfaces of the middle plate 211 and the side plates 212 are respectively abutted against the top support bracket 12 at the corresponding positions;
step 3, at the low water level, assembling the bottom sealing side plates 31 in sequence according to the sequence of the short side and the long side, and installing a horizontal pull rod 4 on the bottom sealing side plates 31 according to the designed hole site and screwing;
step 4, referring to fig. 5, at low water level, installing a plugging ring plate 23, a bottom sealing concrete anchoring steel bar and a bottom sealing concrete reinforcing steel bar net on the peripheral surface of the pile foundation 1 casing 11, and pouring bottom sealing concrete, wherein the thickness of the bottom sealing concrete is 0.6m;
step 5, referring to fig. 6 and 7, dismantling the bottom die 1, the top support bracket 12 and the hoisting mechanism, and breaking the pile head;
step 6, referring to fig. 7 and 8, at low water level, assembling bearing platform side plates 33 on the bottom sealing side plates 31 in sequence of short sides and long sides, and installing inner cofferdam supports and cross braces after the bearing platform side plates 33 are assembled;
step 7, carrying out bearing platform construction: referring to fig. 9, the base surface is cleaned, water is pumped and drained, the construction of the bearing platform and the first section of pier body is carried out, and the bearing platform concrete is poured.
Specific embodiments of the above construction method are shown below.
In the step 1, the middle plate 211 and the side plates 212 with the buoyancy tanks 22 are placed on the sea water surface in sequence mainly by crane hoisting, and pulled in place by a pontoon.
The step 5 specifically includes: after the strength of the bottom sealing concrete meets the requirement, when the water level is above the upper surface of the supporting plate 21, the hoisting mechanism (namely the suspender 6) and the top supporting bracket 12 are dismantled, so that the cofferdam floats on the water surface; the water surface is wetted to the upper surface of the supporting plate 21 and slowly separated from the bottom of the back cover concrete, and the bottom die 2 is integrally pulled out by adopting a steel wire rope; cutting the casing 11 of the pile foundation 1 according to the designed elevation and breaking the pile head.
Further, the pile head is broken by adopting a chiseling mode, and the chiseling position is 10cm higher than the bottom elevation of the bearing platform.
The invention also comprises a step 8, when pier construction is completed and the bearing platform concrete reaches more than 70% of design strength, the side mould 3 can be removed, firstly the internal support in the cofferdam is removed, then the bearing platform side plate 33 and the bottom sealing side plate 31 are removed in sequence, and the side mould 3 can be used for cofferdam construction at other positions after being removed.
According to the scheme, the novel assembled suspended box cofferdam scheme is adopted on the basis of the existing cofferdam construction process, the bottom die 2 is designed to be assembled in a blocking mode, the side dies 3 of the cofferdam are designed to be segmented according to the back cover thickness and the bearing platform height, the cofferdam is designed to be assembled as a whole, the time cost for installing the bottom die 2 and the side dies 3 can be reduced, the bottom die 2 and the side dies 3 can be repeatedly used, the input cost of a template can be greatly reduced, and the purposes of simplifying procedures and saving cost are achieved; the size of the back cover side plate 31 is small, quick installation can be realized before back cover concrete construction, when the bearing platform side plate 33 is assembled later, the back cover concrete is hardened, the working face is fixed, the assembly of the large bearing platform side plate 33 is safer, the construction risk is reduced, and the bearing platform side plate 33 can be customized to different heights according to different engineering requirements; the unique angle steel 32 design on the inner side of the bottom sealing side plate 31 can realize the vertical limit of the bottom sealing side plate 31 and the bottom sealing concrete, improve the connection strength of the bottom sealing side plate 31 and further ensure the construction safety; on the basis of the existing cofferdam construction process, the invention can form continuous and rapid operation by only adding part of the bottom sealing side plates 31, reduces the construction cost, shortens the total construction period, can greatly reduce project mechanical cost, management cost and other fixed expenditure, and can create larger economic benefit for projects.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (10)
1. An assembled cofferdam structure, its characterized in that:
comprises a pile foundation, a bottom die, a side die and a hoisting mechanism;
the pile foundation is square in a four-corner position array; the circumference of the pile foundation pile casing is provided with a plurality of supporting brackets at equal height;
the bottom die comprises a sectional type supporting plate, a plurality of buoyancy tanks and a plugging annular plate consisting of two semi-annular plates; the supporting plate comprises a rectangular middle plate positioned between pile foundations and two side plates arranged on the side edges of the middle plate, the middle plate is detachably connected with the side plates, the buoyancy tanks are arranged below the middle plate and the side plates, and the middle plate and the side plates are upwards abutted against top support brackets at corresponding positions under the buoyancy action of the buoyancy tanks; the side plates are provided with the U-shaped notch matched with the pile foundation; the plugging surrounding plate is embraced on the pile foundation and is matched with the upper surface of the middle plate and the side plates;
the side die comprises a bottom sealing side plate, angle steel and a bearing platform side plate; the lower surface of the bottom sealing side plate is detachably connected to the upper surface of the supporting plate and encloses a cofferdam shape, and a plurality of horizontal pull rods are connected between the bottom sealing side plate and the pile foundation casing; the angle steel is connected to the inner side surface of the bottom sealing side plate along the horizontal direction; the bearing platform side plate is detachably connected to the upper surface of the bottom sealing side plate;
the hoisting mechanism is arranged between the pile foundation pile casing and the upper surface of the bottom die, and plays a role in connection and fixation after the middle plate and the side plates are constructed in place.
2. A fabricated cofferdam structure as set forth in claim 1, wherein:
the long edge of the middle plate is in clearance fit with the peripheral surface of the pile foundation.
3. A fabricated cofferdam structure as set forth in claim 1, wherein:
the middle plate and the side plates are connected and fixed in a manner of finish rolling or bolt locking after being constructed in place.
4. A fabricated cofferdam structure as set forth in claim 1, wherein:
the inner diameter of the plugging annular plate is matched with the outer diameter of the pile casing of the pile foundation.
5. A fabricated cofferdam structure as set forth in claim 1, wherein:
the hoisting mechanism comprises a shoulder pole beam arranged on the circumferential surface of the protective cylinder and a suspender connected between the shoulder pole beam and the bottom die.
6. A fabricated cofferdam structure as set forth in claim 1, wherein:
sponge rubber is adhered between the middle plate and the side plates, between the middle plate and the bottom sealing side plate, and between the bottom sealing side plate and the bottom sealing side plate.
7. A cofferdam construction method, applying the assembled cofferdam structure of any one of claims 1 to 6, characterized by comprising the following steps:
step 1, after the pile foundation construction is finished, installing the top support bracket and the hoisting mechanism on a pile casing of the pile foundation, and then dismantling a drilling platform;
step 2, firstly dragging the middle plate between two rows of pile foundations and temporarily anchoring the middle plate; then sequentially dragging side plates at two sides into the pile foundation from the outer side of the pile foundation, so that the notches of the side plates sleeve the pile foundation casing and temporarily anchor the pile foundation; then the middle plate and the side plates are connected into a whole; finally, the whole bottom die is lifted up through the lifting mechanism, so that the upper surfaces of the middle plate and the side plates are respectively abutted against the top supporting brackets at the corresponding positions;
step 3, assembling the bottom sealing side plates in sequence, and installing a horizontal pull rod on the bottom sealing side plates and screwing;
step 4, installing a plugging ring plate, a back cover concrete anchoring steel bar and a back cover concrete reinforcing steel bar net on the peripheral surface of the pile foundation casing, and pouring back cover concrete;
step 5, dismantling the bottom die, the top support bracket and the hoisting mechanism, and breaking the pile head;
step 6, splicing bearing platform side plates on the bottom sealing side plates in sequence, and installing a cofferdam inner support and a cross brace after splicing the bearing platform side plates;
and 7, carrying out bearing platform construction.
8. A method of constructing a cofferdam as claimed in claim 7, wherein:
in the step 1, a crane is used for hoisting, the middle plate and the side plates with the buoyancy tanks are placed on the sea surface in sequence, and a pontoon is used for pulling in place.
9. A method of constructing a cofferdam as claimed in claim 7, wherein:
the step 5 comprises the following steps: after the strength of the bottom sealing concrete meets the requirement, when the water level is above the upper surface of the supporting plate, the hoisting mechanism and the top supporting bracket are dismantled, so that the cofferdam floats on the water surface; the water surface is wetted to the upper surface of the supporting plate and slowly separated from the bottom of the back cover concrete, and the whole bottom die is pulled out by adopting a steel wire rope; cutting the pile casing of the pile foundation according to the designed elevation, and breaking the pile head.
10. A method of constructing a cofferdam as claimed in claim 7, wherein:
and 8, after pier construction is completed, the side mold can be removed when the bearing platform concrete reaches more than 70% of design strength, and the side mold is reused after being removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310806670.1A CN116905534A (en) | 2023-07-03 | 2023-07-03 | Assembled cofferdam structure and cofferdam construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310806670.1A CN116905534A (en) | 2023-07-03 | 2023-07-03 | Assembled cofferdam structure and cofferdam construction method |
Publications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118517009A (en) * | 2024-07-25 | 2024-08-20 | 中铁十七局集团第六工程有限公司 | Assembled cofferdam structure of bridge high pile cap |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118517009A (en) * | 2024-07-25 | 2024-08-20 | 中铁十七局集团第六工程有限公司 | Assembled cofferdam structure of bridge high pile cap |
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