CN114517486B - Construction method of underwater cofferdam - Google Patents
Construction method of underwater cofferdam Download PDFInfo
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- CN114517486B CN114517486B CN202210251594.8A CN202210251594A CN114517486B CN 114517486 B CN114517486 B CN 114517486B CN 202210251594 A CN202210251594 A CN 202210251594A CN 114517486 B CN114517486 B CN 114517486B
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- cofferdam
- inner support
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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
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a construction method of an underwater cofferdam, which comprises the following steps: s1, cutting a certain position of a steel pile casing after the cofferdam frame is completely placed and fixed with the cofferdam back cover to ensure that the steel pile casing does not influence the installation of an inner support system; s2, assembling an inner support system on the cofferdam box body above the normal water level; four surrounding purlins of the inner support system are fixedly inserted through bolts to form a surrounding purlin frame, the surrounding purlin frame is in a reduced state during installation, and an inner support structure is welded on the inner side of the surrounding purlin frame; and S3, putting the assembled inner support system on the side plate of the cofferdam box body from top to bottom, and expanding the enclosing purlin frame outwards when the inner support system is put to the underwater designed position until the enclosing purlin is closely attached to the inner wall of the cofferdam box body. The invention adopts the inner support system which does not need to be welded underwater in a combined manner, avoids the problem that water needs to be pumped in advance when the inner support system is constructed underwater, realizes the tight fit of the purlin frame and the cofferdam box body, and ensures the common stress in the construction process.
Description
Technical Field
The invention relates to the technical field of underwater construction devices, in particular to a construction method of an underwater cofferdam.
Background
The cofferdam is a temporary watertight structure built around a construction area of a foundation pit to remove water from the construction area. The cofferdam is generally used for building permanent water conservancy facilities and temporary building enclosures, and has the function of preventing water and soil from entering building positions of buildings so as to drain water in the cofferdam, excavate foundation pits and build the buildings. The cofferdam is mainly used in hydraulic buildings in general, and the cofferdam is dismantled after being used up except for being used as a part of a formal building.
The construction mode of the steel cofferdam can be divided into two types: the first mode, as shown in fig. 1 and 2, is that the steel suspension box and the steel cofferdam are mainly assembled with a cofferdam box body above the normal water level, installed with a surrounding purlin and then lowered to the designed position; in the second mode, as shown in fig. 3-5, the double-wall steel suspension boxes and the double-wall steel cofferdam are influenced by the position of the pile foundation, if the distance between the inner support structure and the pile foundation is very close, the cofferdam box body is firstly put in place by adopting the same construction mode as the steel sheet pile cofferdam, water is pumped, then the steel casing is cut, and the enclosing purlin and the inner support structure are welded. The stress of the first mode is better, and compared with the second mode, the inner supporting structure can save materials, but can be adopted only when the inner supporting structure and pile foundation holes have sufficient space. In the second mode, the inner support structure is installed after being transferred, water is firstly pumped before the inner support structure is installed, a pile foundation pile casing is cut off, the inner support structure is not affected by pile positions, but the cofferdam system is deformed due to the fact that the cofferdam system is affected by water pressure difference before the inner support structure is installed, even after the inner support structure is installed again, the inner support structure cannot completely share pressure for the cofferdam, the stress is poor, the support strength of the steel cofferdam is guaranteed, and the materials for manufacturing the cofferdam need to be large and large.
Disclosure of Invention
The invention discloses a construction method of an underwater cofferdam, which avoids the problem that water needs to be pumped in advance when an inner support system is constructed underwater by combining and adopting the inner support system which does not need to be welded underwater, realizes the tight fit of an enclosing purlin frame and a cofferdam box body, and ensures that the enclosing purlin frame and the cofferdam box body can bear force together in the construction process.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a construction method of an underwater cofferdam comprises the following steps:
s1, mounting a cross beam on a main bridge pile foundation casing, suspending a cofferdam frame under the cross beam and lowering the cofferdam frame, and cutting a steel casing at a certain position under water after the cofferdam frame is lowered and fixed with a cofferdam back cover so as to ensure that the steel casing does not influence the mounting of an inner support system;
s2, assembling an inner support system on the cofferdam box body above the normal water level;
the inner support system comprises:
the enclosing purlin frame is adjustable in length and width and comprises four enclosing purlins, one end of each enclosing purlin is provided with an enclosing purlin male head, the other end of each enclosing purlin is provided with an enclosing purlin female head, and the enclosing purlin male heads can be vertically inserted into the enclosing purlin female heads in a matching mode; the male end and the female end of the enclosing purlin are respectively provided with a first slot and a second slot along the length direction of the enclosing purlin, and the first slot and the second slot are provided with certain sliding lengths;
the pin can be inserted into the first slot of the surrounding purlin and the adjacent second slot of the surrounding purlin in a matched mode, so that the male head of the surrounding purlin is fixed with the female head of the surrounding purlin of the adjacent surrounding purlin.
The inner supporting structure is transversely and obliquely arranged, two ends of the inner supporting structure respectively support the inner side edge of the enclosing purlin frame, and the length of the inner supporting structure can be adjusted;
the four surrounding purlins are fixedly inserted through the pins to form a surrounding purlin frame, the surrounding purlin frame is in a reduced state during installation, the pins are fixed at the inner ends of a first slot and a second slot of the surrounding purlin, and the inner support structure is welded on the inner side of the surrounding purlin frame;
s3, placing the assembled inner support system on a side plate of the cofferdam box body, adjusting the length of the inner support structure to be lengthened when the inner support system is placed to a design position underwater, expanding the frame of the enclosing purlin outwards, sliding the bolt to the outer ends of the first slot and the second slot of the enclosing purlin until the enclosing purlin is closely attached to the inner wall of the cofferdam box body, and then fixing the inner support structure to enable the length of the inner support structure not to be changed; and repeating the operation until the multilayer inner support system is installed.
Further, enclose the purlin male end front end including a picture peg, enclose the purlin female end front end including two splint, two space between the splint can match and insert the picture peg.
Furthermore, the clamping plate comprises a vertical clamping plate unit and a transverse clamping plate unit, and two side edges of the transverse clamping plate unit are respectively connected with the middle part of the vertical clamping plate unit.
Further, inner support structure includes interior support and adjustable wedge, the both ends of interior support are provided with an adjustable wedge respectively, every adjustable wedge includes two relative gliding wedge units, nut and screw-thread steel, the side that the wedge unit is relative is the hypotenuse, is provided with the wedge and leads to the groove, the screw-thread steel can pass two the wedge unit the wedge leads to the groove, and both ends matching is provided with the nut fixed the wedge unit.
Furthermore, the length of the inner support structure is adjusted by the following method: and loosening the nut, adjusting the relative position of the wedge block unit to enable the distance between the front side surface and the rear side surface of the adjustable wedge block to be lengthened or shortened, and screwing the nut when the distance is adjusted to be proper.
Furthermore, the inner support structure is provided with at least five pieces, wherein four pieces of inner support structure respectively form triangular supports for four corners of the enclosing purlin frame, and one piece of inner support structure is connected between the middle parts of the long edges of the enclosing purlin frame.
Furthermore, the inner support system is installed from the lower layer to the upper layer.
The construction method of the underwater cofferdam combines the inner support system with adjustable size, after the steel cofferdam is installed, the steel casing is cut, then the outer diameter of the enclosing purlin frame is reduced, so that the enclosing purlin frame and the inner support structure are placed in place and fixed without obstruction, the outer diameter of the enclosing purlin frame is enlarged by adjusting the threaded steel and the nut, the enclosing purlin is tightly attached to the outer wall, and the common stress in the construction process is ensured.
The invention has the following advantages:
(1) By adopting the construction method, the connection mode of the ends of the enclosing purlins in the inner support system is pin shaft connection, welding is not needed, so that the connection quality of the enclosing purlins can be ensured without pumping water in advance, the balance of water pressure inside and outside the cofferdam box body is kept, the adverse effect of water pressure in the second traditional construction mode on the cofferdam is avoided, the connection stability of the enclosing purlins and the effective support on the cofferdam frame are ensured, more economic materials can be selected as the cofferdam walls in the design stage, and the cost is saved.
(2) In the inner support system used by the invention, the enclosing purlins are connected by the pin shafts, so that the mounting and dismounting process is more convenient and faster.
(3) By adopting the construction method, the workload of welding on water is reduced, the pollution of welding slag to a water source is reduced, and the construction method is more economic and environment-friendly.
Drawings
Fig. 1 is a schematic structural view of a steel cofferdam structure in the first construction mode in the background art in a front view during assembly.
Fig. 2 is a schematic structural view of a steel cofferdam structure in the prior art when the steel cofferdam structure is lowered.
Fig. 3 is a schematic plan view of the steel cofferdam structure according to the second construction method of the background art when it is lowered.
Fig. 4 is a schematic structural view of a steel cofferdam structure according to a second construction method in the background art when water is pumped for the first time.
Fig. 5 is a schematic structural view of a steel cofferdam structure according to a second construction method in the background art in a front view during secondary water pumping.
Fig. 6 is a schematic top view of the purlin frame when the inner support system is lowered.
Fig. 7 is a schematic top view of a purlin frame with an enlarged inner support system.
Fig. 8 is a top view of the purlin frame and inner support structure with the inner support system expanded.
Fig. 9 is a schematic perspective view of a purlin frame and an inner support structure when the inner support system is expanded.
Fig. 10 is a perspective view of a purlin.
Fig. 11 is a schematic perspective view of an adjustable wedge block when the inner support system is lowered.
Fig. 12 is a schematic perspective view of an adjustable wedge block when the inner support system is expanded.
In the figure, a cofferdam box body 1, an inner supporting structure 2, an inner support 201, a wedge-shaped block unit 202, deformed steel bars 203, nuts 204, an enclosing purlin frame 3, an enclosing purlin 301, a female head 302, a male head 303, a normal water level 4, a main bridge pile foundation pile casing 5, a steel pipe pile 6, a first water pumping elevation 7, a second water pumping elevation 8 and a bolt 9.
Detailed Description
The present invention is further illustrated by the following specific examples, but the scope of the present invention is not limited to the following examples.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
A construction method of an underwater cofferdam comprises the following steps:
s1, a construction platform is built on a steel pipe pile 6, a cross beam is installed on a main bridge pile foundation casing 5, a cofferdam frame 3 is suspended below the cross beam and is lowered, the prior art is provided, and the detailed process refers to the invention patent ZL 201610425658.6, namely a cofferdam lowering construction method; after the cofferdam frame 3 is completely placed and fixed with the cofferdam back cover, cutting the steel pile casing 5 to a certain position to ensure that the steel pile casing 5 does not influence the installation of the inner support system;
s2, assembling an inner support system on the cofferdam box body 1 above the normal water level 4;
as shown in fig. 8 and 9, the inner support system comprises an enclosing purlin frame 3, a latch 9 and an inner support structure 2, wherein: the enclosing purlin frame 3 is adjustable in length and width and comprises four enclosing purlins 301, one end of each enclosing purlin 301 is provided with an enclosing purlin male head 303, one end of each enclosing purlin 301 is provided with an enclosing purlin female head 302, and the enclosing purlin male heads 303 can be vertically inserted into the enclosing purlin female heads 302 in a matched mode; the enclosing purlin male head 303 and the enclosing purlin female head 302 are respectively provided with a first slot and a second slot along the length direction of the enclosing purlin 301, and the first slot and the second slot are provided with certain sliding lengths so that the bolt 9 can slide in the first slot and the second slot along the length direction of the first slot and the second slot; the bolts 9 can be inserted into a first slot of one surrounding purlin 301 and a second slot of an adjacent surrounding purlin 302 in a matched manner, namely, two ends of one surrounding purlin 301 are respectively and vertically connected with the other surrounding purlin 301, a surrounding purlin male head 303 of the other surrounding purlin 301 is inserted into a surrounding purlin female head 302 of the other surrounding purlin 301, a surrounding purlin male head 303 of one end is inserted into a surrounding purlin female head 302 of the other surrounding purlin 301, and the bolts 9 are inserted into two ends of each surrounding purlin male head 303, so that the surrounding purlin male head 303 of one surrounding purlin 301 is fixed with the surrounding purlin female head 302 of the adjacent surrounding purlin 301; when enclosing purlin frame 3 and need be the expansion state, bolt 9 removes to the outer end of first slot and second slot, when bolt 9 fixes the outermost end at first slot and second slot, cofferdam frame 3's size is the biggest state, when enclosing purlin frame 3 and need be when dwindling the state, bolt 9 removes to the inner end of first slot and second slot, when bolt 9 fixes the innermost end at first slot and second slot, cofferdam frame 3's size is minimum state. Inner supporting structure 2, it is horizontal and the slant setting, and both ends are supported respectively and are lived the inboard side of enclosing purlin frame 3 to guarantee to enclose purlin frame 3 indeformable, and length-adjustable guarantees no matter enclose purlin frame 3 and be the expansion or reduce the state, and the homoenergetic stable stay is lived and is enclosed purlin frame 3.
The four surrounding purlins 301 are fixedly spliced through the pins 9 to form a surrounding purlin frame 3, the surrounding purlin frame 3 is in a reduced state during installation, namely the pins 9 are fixed at the inner ends of a first slot and a second slot of the surrounding purlins, the inner support structure 2 is welded on the inner side of the surrounding purlin frame 3, and correspondingly, the inner support structure 2 is in a shorter state;
s3, placing the assembled inner support system on a side plate of the cofferdam box body 1, adjusting the length of the inner support structure 2 to be lengthened when the inner support system is placed to a design position under water, expanding the surrounding purlin frame 3 outwards, sliding the bolt 9 to the outer ends of the first slot and the second slot of the surrounding purlin 301 until the surrounding purlin 301 is closely attached to the inner wall of the cofferdam box body 1, and then fixing the inner support structure 2 to enable the length of the inner support structure not to be changed; and repeating the operation until the installation of the multilayer internal support system is finished.
After the cofferdam construction is finished, the water in the cofferdam box body 1 is pumped out, and then the engineering construction in the cofferdam can be carried out.
Further, as shown in fig. 6, 7 and 10, the front end of the male head 303 of the enclosing purlin comprises an inserting plate, the front end of the female head 302 of the enclosing purlin comprises two clamping plates, and the space between the two clamping plates can be inserted into the inserting plate in a matching way, preferably just inserted into the inserting plate, so as to prevent the up-and-down movement of the frame 3 of the enclosing purlin.
Furthermore, the clamping plate comprises a vertical clamping plate unit and a transverse clamping plate unit, and two side edges of the transverse clamping plate unit are respectively connected with the middle part of one vertical clamping plate unit. In order to facilitate processing, the enclosing purlin is divided into an enclosing purlin male head 303, an enclosing purlin female head 302 and an enclosing purlin middle section, the enclosing purlin male head 303, the enclosing purlin female head 302 and the enclosing purlin middle section can be processed respectively, the two clamping plates are made of two sections of I-steel respectively, the enclosing purlin female head 302 is formed by welding two sections of I-steel on the upper portion and the lower portion of one end of the enclosing purlin middle section respectively, the enclosing purlin male head 303 is formed by welding two sections of I-steel on the upper portion and the lower portion of the other end of the enclosing purlin middle section respectively, an inserting plate is welded in the middle of the enclosing purlin middle section, the two sections of I-steel extend out in the length direction of the inserting plate, the upper side and the lower side of the inserting plate are attached to vertical clamping plate units of the I-steel on the upper portion and the lower portion respectively, and therefore the inserting plate can be well guaranteed to be inserted between the two clamping plates of the enclosing purlin female head 302.
Further, the inner support structure includes an inner support 201 and adjustable wedge blocks, two ends of the inner support 201 are respectively provided with one adjustable wedge block, as shown in fig. 11 and 12, each adjustable wedge block includes two wedge block units 202 capable of sliding relatively, a nut 204 and a deformed steel bar 203, opposite sides of the wedge block units 202 are oblique sides, and are provided with wedge block through grooves, the deformed steel bar 203 can penetrate through the wedge block through grooves of the two wedge block units 202, and two ends of the deformed steel bar are provided with nut 204 to fix the wedge block units 202 in a matching manner. The wedge channel is provided with a sliding length such that the opposing oblique sides of the wedge unit 202 can slide relative to each other while the upper and lower outer sides remain in a horizontal plane, thus allowing the distance between the front and rear of the adjustable wedge to be varied, thereby allowing the length of the entire internal support structure to be varied. When the left and right outer sides of the two opposite wedge block units 202 are respectively flush, the length of the adjustable wedge block is shortest, which also means that the length of the inner support structure is shortest; when two opposite wedge block units 202 are staggered, the length is gradually increased, which also means that the length of the inner support structure is increased.
The length adjusting method of the inner support structure comprises the following steps: and loosening the nut 204, adjusting the relative position of the wedge block unit 202 to enable the distance between the front side surface and the rear side surface of the adjustable wedge block to be lengthened or shortened, and tightening the nut 204 when the distance is adjusted to be proper. The direction of adjustment can be seen in the description of the previous paragraph.
Furthermore, for guaranteeing to enclose purlin frame 3 and can have sufficient support strength, this embodiment provides an inner support structure's mode of setting, inner support structure 2 is provided with five at least, wherein four inner support structure 2 form triangular supports to enclosing purlin frame 3's four angles respectively, the one end that every 2 are close to is preferably pasted together, one of them inner support structure 2 is connected between the middle part of enclosing purlin frame 3 long limit, so can all form stable support to enclosing purlin frame 3's four angles and middle part. Of course, the arrangement mode of the inner supporting structure can be adjusted adaptively according to the size of the specific cofferdam frame box 1.
Furthermore, the adjustable wedge-shaped block closely attached to the enclosing purlin frame 3 is fixedly welded with the enclosing purlin frame 3, and the adjustable wedge-shaped block closely attached to the inner support is fixedly welded with the inner support. The welding process is completed by welding in advance when the purlin is not placed, so that the stable connection of the purlin enclosing frame 3 and the inner support structure 2 can be ensured.
Compared with the first mode of the background art, the construction method of the invention has the advantages that as shown in figures 1 and 2, if the distance between the inner support structure 2 and the steel casing 5 is very close, the first mode cannot be adopted, and because the invention can not pump water to cut the steel casing 5, the installation of the cofferdam box body 1, the enclosing purlin frame 3 and the inner support structure 2 is not influenced by the position of the steel casing 5.
Compared with the second mode of the background art, the second mode is that as shown in fig. 3-5, the cofferdam box body 1 is firstly put down in place, water pumping is needed to be carried out to avoid underwater welding for not influencing the welding quality between the surrounding purlins 301, meanwhile, for reducing the influence of the water pressure difference on the cofferdam box body 1 as much as possible, therefore, the water pumping needs to be carried out for multiple times, the water pumping is carried out until the water pumping elevation 7 is firstly carried out, then a section of steel casing is cut, the surrounding purlins 301 and the inner supporting structures 2 which are positioned on the uppermost layer are welded, the water pumping is carried out until the water pumping elevation 8 is carried out for the second time, then a section of steel casing is cut, the surrounding purlins 301 and the inner supporting structures 2 which are positioned on the second layer are welded, and the steps are repeated until the surrounding purlin frames 3 and the inner supporting structures 2 on the second layer are installed. The second mode is because between enclosing the purlin 301, the connected mode between enclosing purlin 301 and the inner supporting structure 2 is the welding, and underwater welding is difficult to guarantee to enclose between the purlin 301, encloses the welding quality between purlin 301 and the inner supporting structure 2, leads to drawing water earlier and installs again and enclose purlin 301 and inner supporting structure 2, nevertheless because inside and outside water pressure is unbalanced, encloses the unable very first time of purlin frame 3 and helps cofferdam box 1 to share water pressure, leads to cofferdam box 1 can take place deformation. In the inner support system adopted by the invention, the enclosing purlins 301 are connected in a bolt fixing mode, and the welding seams of the wedge block units 202 and the enclosing purlins 301 and the welding seams of the wedge block units 202 and the inner supports 201 can be welded on water in advance, so that the enclosing purlin frames 3 and the inner support structures 2 can be installed without pumping water, the cofferdam box body 1 is ensured not to deform, the enclosing purlin frames 3 are fully stressed on the cofferdam box body 1, and the cofferdam box body 1 is effectively supported.
The cofferdam construction method overcomes the adverse effect of water pressure on the cofferdam in the second traditional construction mode, ensures the connection stability of the enclosing purlin and the support sufficiency of the cofferdam frame, and simultaneously can select more economical materials as the cofferdam walls in the design stage, thereby saving the cost.
Claims (6)
1. A construction method of an underwater cofferdam is characterized by comprising the following steps:
s1, mounting a cross beam on a main bridge pile foundation casing, suspending a cofferdam frame under the cross beam and lowering the cofferdam frame, and cutting a steel casing at a certain position under water after the cofferdam frame is lowered and fixed with a cofferdam back cover so as to ensure that the steel casing does not influence the mounting of an inner support system;
s2, assembling an inner support system on the cofferdam box body above the normal water level;
the internal support system comprises:
the enclosing purlin frame is adjustable in length and width and comprises four enclosing purlins, one end of each enclosing purlin is provided with an enclosing purlin male head, the other end of each enclosing purlin is provided with an enclosing purlin female head, and the enclosing purlin male heads can be vertically inserted into the enclosing purlin female heads in a matched mode; the male end and the female end of the enclosing purlin are respectively provided with a first slot and a second slot along the length direction of the enclosing purlin, and the first slot and the second slot are provided with certain sliding lengths;
the pin can be inserted into the first slot of one surrounding purlin and the second slot of the adjacent surrounding purlin in a matching manner, so that the male head of one surrounding purlin is fixed with the female head of the adjacent surrounding purlin;
the inner supporting structure is transversely and obliquely arranged, two ends of the inner supporting structure respectively support the inner side edge of the enclosing purlin frame, and the length of the inner supporting structure can be adjusted; the adjustable wedge-shaped block comprises an inner support and adjustable wedge-shaped blocks, wherein two adjustable wedge-shaped blocks are respectively arranged at two ends of the inner support, each adjustable wedge-shaped block comprises two wedge-shaped block units capable of sliding relatively, a nut and deformed steel bars, the opposite side edges of the wedge-shaped block units are inclined edges, wedge-shaped block through grooves are formed in the side edges, the deformed steel bars can penetrate through the wedge-shaped block through grooves of the two wedge-shaped block units, and nuts are arranged at two ends of the side edges in a matched mode to fix the wedge-shaped block units;
the four enclosing purlins are fixedly inserted through the pins to form an enclosing purlin frame, the enclosing purlin frame is in a reduced state during installation, the pins are fixed at the inner ends of a first slot and a second slot of the enclosing purlin, and the inner support structure is welded on the inner side of the enclosing purlin frame;
s3, placing the assembled inner support system on a side plate of the cofferdam box body, adjusting the length of the inner support structure to be lengthened when the inner support system is placed to a design position underwater, expanding the frame of the enclosing purlin outwards, sliding the bolt to the outer ends of the first slot and the second slot of the enclosing purlin until the enclosing purlin is closely attached to the inner wall of the cofferdam box body, and then fixing the inner support structure to enable the length of the inner support structure not to be changed; and repeating the step S3 to finish the installation of the multi-layer supporting system.
2. The construction method of an underwater cofferdam as recited in claim 1, wherein:
enclose the purlin male end front end including a picture peg, enclose the purlin female end front end including two splint, two space between the splint can match and insert the picture peg.
3. The construction method of an underwater cofferdam as recited in claim 2, wherein:
the clamp plate comprises a vertical clamp plate unit and a transverse clamp plate unit, and two side edges of the transverse clamp plate unit are respectively connected with the middle part of the vertical clamp plate unit.
4. The construction method of an underwater cofferdam as recited in claim 1, wherein:
the length adjusting method of the inner support structure comprises the following steps: and loosening the nut, adjusting the relative position of the wedge block unit to enable the distance between the front side surface and the rear side surface of the adjustable wedge block to be lengthened or shortened, and tightening the nut when the distance is adjusted to be proper.
5. The construction method of an underwater cofferdam according to claim 1 or 4, wherein:
the inner support structure is at least provided with five, wherein four triangular supports are respectively formed at four corners of the enclosing purlin frame, and one triangular support is connected between the middle parts of the long edges of the enclosing purlin frame.
6. The construction method of an underwater cofferdam as recited in claim 1, wherein:
the inner support system is arranged from the lower layer to the upper layer.
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| CN101838994B (en) * | 2010-05-20 | 2012-05-30 | 中铁六局集团有限公司 | Construction method of steel sheet pile cofferdam for integral type steel purlin |
| CN102191777B (en) * | 2011-05-12 | 2012-12-12 | 广州市市政集团有限公司 | Steel sheet pile coefferdam structure and topdown construction method thereof |
| CN205917702U (en) * | 2016-06-15 | 2017-02-01 | 中铁港航局集团有限公司 | Whole system of transferring of bridge deep basal pit steel sheet piling cofferdam internal stay |
| CN106948353B (en) * | 2017-05-03 | 2019-06-07 | 中交第二航务工程局有限公司 | A kind of deep water combined steel plate pile cofferdam construction method |
| CN112302043B (en) * | 2020-10-23 | 2022-03-29 | 中国五冶集团有限公司 | Inner support guiding device for lock catch steel pipe pile cofferdam |
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