CN115075273B - Reinforced concrete prefabricated pouring jacket cofferdam and construction method - Google Patents
Reinforced concrete prefabricated pouring jacket cofferdam and construction method Download PDFInfo
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- CN115075273B CN115075273B CN202210836763.4A CN202210836763A CN115075273B CN 115075273 B CN115075273 B CN 115075273B CN 202210836763 A CN202210836763 A CN 202210836763A CN 115075273 B CN115075273 B CN 115075273B
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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
- 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
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D25/00—Joining caissons, sinkers, or other units to each other under water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
Abstract
The invention discloses a reinforced concrete prefabricated box cofferdam, which comprises a plurality of reinforced concrete prefabricated box units connected side by side, wherein each reinforced concrete prefabricated box unit comprises 2 side plates and 2 webs, hidden beams which are crisscrossed vertically and horizontally are respectively arranged in the side plates and the webs at intervals, the 2 webs are respectively embedded between the inner side surfaces of the 2 side plates, and a plurality of steel plate embedded parts on the two longitudinal sides of the side plates and angle steel embedded parts corresponding to the edges of the two longitudinal sides of the adjacent webs are welded to form a rectangular reinforced concrete prefabricated box unit. The construction method comprises 1) assembling reinforced concrete prefabricated box units, 2) welding and forming the reinforced concrete prefabricated box units, and 3) constructing the reinforced concrete prefabricated box cofferdam. The invention reduces the construction procedures, obviously improves the construction efficiency, shortens the construction period and effectively reduces the construction cost. The water operation time is reduced, and the construction safety is improved.
Description
Technical Field
The invention relates to a cofferdam structure, in particular to a concrete cofferdam formed by splicing and pouring unit bodies on land and then submerged in water and a construction method, and belongs to the technical field of hydraulic engineering construction.
Background
The cofferdam is a temporary enclosure structure built for building a permanent hydraulic facility in hydraulic engineering construction. The cofferdam is used for preventing water and soil from entering a building construction position so as to drain water in the cofferdam, excavate a foundation pit and build the building. The cofferdam is generally used for hydraulic construction, and is generally dismantled after the hydraulic construction is built except as a part of a formal building; wherein, earth-rock cofferdam and concrete cofferdam use comparatively extensively.
The concrete cofferdam is generally divided into an underwater construction part and an over-water construction part, the existing underwater structure part of the concrete cofferdam adopts a sinking steel sleeve box, and the reinforced concrete is poured in the steel sleeve box.
Disclosure of Invention
The invention aims to provide a reinforced concrete prefabricated pouring jacket cofferdam with a simple structure and convenient construction and a construction method.
The invention is realized by the following technical scheme:
the reinforced concrete prefabricated box cofferdam comprises a plurality of reinforced concrete prefabricated box units which are connected side by side, wherein each reinforced concrete prefabricated box unit comprises 2 side plates and 2 webs, the height H1 of each side plate is equal to the height H2 of each web, the width B1 of each side plate is smaller than the width B2 of each web, longitudinal hidden beams and transverse hidden beams are respectively arranged in each side plate and each web at intervals, the longitudinal hidden beams and the transverse hidden beams are crisscrossed to form a grid shape, the thickness of each longitudinal hidden beam and the thickness of each transverse hidden beam are respectively equal to the thickness of the corresponding side plate and the thickness of the corresponding web, and a reinforcement cage is respectively arranged in each longitudinal hidden beam and each transverse hidden beam Liang Nafen; the longitudinal dark beams and the transverse dark beams are respectively arranged at the edges of the two longitudinal sides and the upper end and the lower end of the web plate; the steel plate embedded parts are welded and fixed on the side plates and the web plate respectively, and the angle steel embedded parts are welded and fixed on the edges of the two longitudinal sides of the web plate respectively at intervals; 2 webs are respectively embedded between the inner side surfaces of 2 side plates, a plurality of steel plate embedded parts on the two longitudinal sides of the side plates and angle steel embedded parts corresponding to the edges on the two longitudinal sides of the adjacent webs are welded into rectangular reinforced concrete prefabricated box units, and the two ends of each reinforced concrete prefabricated box unit are respectively provided with a lapping edge; and the lapping edge end surfaces of the reinforced concrete prefabricated box sleeve units are spliced into a cofferdam in a propping way.
The object of the present invention can be further achieved by the following technical means.
Further, two ends of a plurality of diagonal tendons arranged vertically at intervals are respectively welded and fixed between the inner side plates of four corners of the reinforced concrete prefabricated box unit and the adjacent web plates, two ends of a plurality of vertical lacing wires arranged vertically at intervals are respectively welded and fixed between the inner side centers of the corresponding side plates, two ends of a plurality of transverse lacing wires arranged vertically at intervals are respectively welded and fixed between the inner side centers of the corresponding web plates, and the welding points are respectively positioned on the embedded anchor bars corresponding to the hidden beam crossing points.
Further, 2 pre-buried rings subassembly are respectively symmetrical to be fixed on sideboard lower part or web lower part, pre-buried rings subassembly includes bottom plate and eye bolt, the bottom plate is respectively symmetrical welded fastening on sideboard lower part or web lower part corresponds the anchor bar end, and eye bolt lower part welded fastening is on the bottom plate center.
Further, 2 group's hanger plate subassembly lower extreme symmetry respectively is fixed on sideboard upper end both sides or web upper end both sides, the hanger plate subassembly includes 2 hanger plates that open the upper end and have the lifting eye, the hanger plate inboard respectively with 2 rows of upper and lower interval arrangement's horizontal muscle both ends welded fastening, hanger plate subassembly upper end stretches out sideboard upper end terminal surface or web upper end terminal surface respectively, hanger plate subassembly lower part symmetry centre gripping is pre-buried to be fixed in the position that sideboard upper end or web upper end correspond.
A construction method of a reinforced concrete prefabricated pouring jacket cofferdam comprises the following steps:
1) Assembled reinforced concrete prefabricated box unit
1.1 Firstly, lifting and conveying a web plate to one side of an assembly jig frame, enabling two ends of the web plate to be respectively inserted between a first upright post and a second upright post at two ends of the assembly jig frame, then respectively rotating screw rods at the upper end and the lower end of the second upright post, enabling screw rod ends to respectively lean against two ends of one side face of the web plate, enabling two ends of the other side face of the web plate to respectively lean against the first upright post, and vertically positioning the web plate on one side of the assembly jig frame; then lifting the other web plate to the other side of the assembly jig frame, enabling two ends of the other web plate to be respectively inserted between a third vertical rod and a fourth vertical rod at two ends of the assembly jig frame, respectively rotating screw rods at the upper end and the lower end of the fourth vertical rod, enabling the end heads of the screw rods to respectively abut against two ends of one side surface of the other web plate, enabling two ends of the other side surface of the other web plate to respectively abut against the third vertical rod, and vertically positioning the other web plate on the other side of the assembly jig frame; adjusting the longitudinal position of the other web plate to enable the end heads of the two web plates to be level;
1.2 Firstly, lifting one side plate to a position between a fifth vertical rod at one end of the assembly jig frame and one end of two webs, and then lifting the other side plate to a position between the fifth vertical rod at the other end of the assembly jig frame and the other end of the two webs; the transverse positions of the two side plates are regulated, so that the overlapping lengths of four corners of the assembled rectangular frame are consistent; then respectively rotating the screw rods at the upper end and the lower end of the fifth upright rod, wherein the screw rod ends respectively lean against two ends of one side surface of the side plate, and two ends of the other side surface of the side plate respectively lean against corresponding ends of the two webs, so that the assembly and the positioning of the reinforced concrete prefabricated box sleeve unit are completed;
2) Welding forming of reinforced concrete prefabricated box unit
2.1 The steel plate embedded parts and the adjacent angle steel embedded parts are sequentially welded at right angles on the inner side and the outer side of the joint of the two ends of the side plate and the end heads of the web plate, and the inner side and the outer side of the adjacent side plate and the inner side of the web plate are welded in a crossing manner, and are sequentially welded in a crossing manner according to the diagonal direction of the reinforced concrete prefabricated box sleeve unit;
2.2 After the assembly welding of the two ends of the side plate and the web plate end heads at one height is completed, sequentially welding a plurality of diagonal ribs in four corners of the reinforced concrete prefabricated box unit and a plurality of vertical lacing wires and a plurality of horizontal lacing wires in the center of the reinforced concrete prefabricated box unit in the same height of the reinforced concrete prefabricated box unit;
2.3 Repeating the steps 2.1) and 2.2) for a plurality of times in the height direction of the reinforced concrete prefabricated box unit, and gradually completing the assembly welding of the reinforced concrete prefabricated box unit;
3) Construction of reinforced concrete prefabricated pouring jacket cofferdam
3.1 After leveling the riverbed in the cofferdam box construction area, a diver adopts a hoisting mode that a crawler crane is used for hoisting 4 steel wire ropes on 8 hoisting points at the upper end of a reinforced concrete prefabricated box unit through a main hoisting steel wire rope, the reinforced concrete prefabricated box unit is hoisted into a sinking area, and the direction of a sideboard is along the water flow direction; in the sinking process, the winch is utilized to carry out azimuth adjustment on the reinforced concrete prefabricated box unit, so that the deviation of the reinforced concrete prefabricated box unit caused by water flow is prevented;
3.2 After the reinforced concrete prefabricated box unit is lifted in place, checking by using a total station, if the deviation exceeds the allowable range, carrying out azimuth adjustment on the reinforced concrete prefabricated box unit again by using a winch until the longitudinal axis of the reinforced concrete prefabricated box unit is aligned with the lofting axis, and finishing the positioning of the reinforced concrete prefabricated box unit; then, pouring concrete in the first reinforced concrete prefabricated box unit;
3.3 Repeating the related processes of the steps 3.1) to 3.2), completing the positioning of a second reinforced concrete prefabricated box unit, enabling the side plate end at one side of the second reinforced concrete prefabricated box unit to respectively prop against the side plate end corresponding to the first reinforced concrete prefabricated box unit to form a compartment, inserting a channel steel water stop bar at the joint of the side plate end, and then pouring underwater concrete in the compartment to complete the concrete pouring in the second reinforced concrete prefabricated box unit; and the like, completing the concrete pouring in the third to nth reinforced concrete prefabricated box units one by one, thereby completing the construction of the reinforced concrete prefabricated box cofferdam.
The reinforced concrete prefabricated box unit is formed by integrally welding and assembling 2 side plates and 2 webs, has a simple structure and is convenient to install, the box unit can be directly used as a part of a concrete cofferdam without dismantling, construction procedures are reduced, construction time is saved, and construction efficiency is remarkably improved; the invention reduces the procedure of removing the sleeve box, further reduces the investment of manpower, mechanical equipment and raw materials, shortens the construction period and effectively reduces the construction cost. The sleeve box is not required to be removed, so that the water operation time is reduced, the risk of the water operation is reduced, and the construction safety is improved.
Advantages and features of the invention will be illustrated and explained by the following non-limiting description of preferred embodiments, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a top view of a spliced reinforced concrete precast box unit on a spliced jig frame;
FIG. 2 is a schematic view of the structure of the vertical plate;
FIG. 3 is a schematic view of the structure of a web;
FIG. 4 is an enlarged schematic view of the embedded sling assembly;
FIG. 5 is an enlarged schematic view of the hanger plate assembly;
FIG. 6 is an enlarged view of section I of FIG. 1;
FIG. 7 is a schematic illustration of the erection of a prefabricated reinforced concrete pouring jacket;
fig. 8 is a three-dimensional perspective view of a prefabricated set of reinforced concrete assembled on an assembled jig.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples of primary longitudinal concrete cofferdams for use in the yanzhou junction project.
In the description of the present invention, terms such as "upper", "lower", "left", "right", "inner", "outer", and the like, which indicate orientation or position, are based on the orientation shown in the drawings, and are used only for simplifying the description, and do not indicate or imply that the present invention must have a specific orientation or position.
As shown in fig. 1 to 7, the reinforced concrete prefabricated sleeve for the yanzhou junction engineering assembled in this embodiment includes 2 side plates 11 and 2 webs 12, the height H1 of the side plates is equal to the height H2 of the webs, and is 6000mm, the width b1=4000 mm of the side plates, the width b2=5000 mm of the webs, longitudinal hidden beams 111 and transverse hidden beams 112 are respectively arranged at intervals between the side plates 11 and the webs 12, the longitudinal hidden beams 111 and the transverse hidden beams 112 are crisscrossed into a grid shape, the thickness of the longitudinal hidden beams 111 and the width of the transverse hidden beams 112 are equal to the thickness of the corresponding side plates 11 and the thickness of the webs 12, in this embodiment, the thickness of the longitudinal hidden beams 111 and the width of the transverse hidden beams 112 are all 150mm. Reinforcement cages 113 are respectively arranged in the longitudinal hidden beams 111 and the transverse hidden beams 112, and reinforcement meshes 114 are arranged in a grid surrounded by the longitudinal hidden beams 111 and the transverse hidden beams 112. The upper and lower ends of the side plate 11 are respectively provided with a transverse hidden beam 112, and the longitudinal side edges and the upper and lower ends of the web plate 12 are respectively provided with a corresponding longitudinal hidden beam 111 and a corresponding transverse hidden beam 112. The steel plate embedded parts 2 are welded and fixed on the side plates 11 and the web plates 12 at intervals in a matrix shape, and the angle steel embedded parts 3 are welded and fixed on the edges of two longitudinal sides of the web plates 12 at intervals. The 2 webs 12 are respectively embedded between the inner side surfaces of the 2 side plates 11, and a plurality of steel plate embedded parts 2 on the two longitudinal sides of the side plates 11 and corresponding angle steel embedded parts 3 on the two longitudinal side edges of the adjacent webs 12 are welded into a reinforced concrete prefabricated box sleeve unit 10 with the two longitudinal sides provided with overlapping edges 115 respectively. The edges of the overlapping edges 115 of the plurality of prefabricated reinforced concrete box units 10 are spliced together into a cofferdam.
The two ends of a plurality of diagonal braces 4 which are arranged vertically at intervals are respectively welded and fixed between the inner side plates 11 of four corners of the reinforced concrete prefabricated box unit 10 and the adjacent web plates 12, the two ends of a plurality of vertical tie bars 6 which are arranged vertically at intervals are respectively welded and fixed between the inner side centers of the corresponding side plates 11, the two ends of a plurality of transverse tie bars 7 which are arranged vertically at intervals are respectively welded and fixed between the inner side centers of the corresponding web plates 12, and the welding points are respectively positioned on the embedded anchor bars 5 corresponding to the hidden beam crossing points.
The 2 pre-buried lifting ring assemblies 8 are symmetrically fixed on the lower part of the side plate 11 or the lower part of the web plate 12 respectively, the pre-buried lifting ring assemblies 8 comprise a bottom plate 81 and lifting ring bolts 82, the bottom plate 81 is symmetrically welded and fixed on the lower part of the side plate 11 or the lower part of the web plate 12 corresponding to the end heads of the anchor bars 5 respectively, and the lower part of the lifting ring bolts 82 is welded and fixed on the center of the bottom plate 81.
The lower ends of the 2 groups of hanging plate assemblies 9 are symmetrically fixed on the upper ends of the side plates 11 or the upper ends of the webs 12 respectively, the hanging plate assemblies 9 comprise 2 hanging plates 91 with hanging holes 911 formed in the upper ends, the inner sides of the hanging plates 91 are welded and fixed with two ends of 2 rows of transverse ribs 92 which are vertically arranged at intervals respectively, the upper ends of the hanging plate assemblies 9 extend out of the upper end faces of the side plates 11 or the upper end faces of the webs 12 respectively, and the lower parts of the hanging plate assemblies 9 are symmetrically clamped and pre-buried and fixed at positions corresponding to the upper ends of the side plates 11 or the upper ends of the webs 12.
The lifting ring assembly 8 and the lifting plate assembly 9 are matched for use, the prefabricated side plates 11 or the web plates 12 can be safely lifted and converted from a horizontal state to a vertical assembly state, and 8 lifting plate assemblies 9 at the upper ends of the side plates 11 and the upper ends of the web plates 12 can serve as 8 lifting points to lift and transport the splice-welded reinforced concrete prefabricated box sleeve unit 10 to an installation position in water.
A construction method of a reinforced concrete prefabricated pouring jacket cofferdam comprises the following steps:
1) Assembled reinforced concrete prefabricated box unit 10
The order of installation of the 2 side plates 11 and 2 webs 12 is as shown in fig. 1 and 8 (1) to (4), wherein (1) to (2) are followed by 2 webs 12 and (3) to (4) are followed by 2 webs 12.
1.1 As shown in fig. 1 and 8), a web 12 (shown in fig. 1) is lifted and assembled on one side of the jig frame 20, two ends of the web 12 are respectively inserted between a first upright 201 and a second upright 202 at two ends of the assembled jig frame 20, then screws 206 at the upper end and the lower end of the second upright 202 are respectively rotated, the ends of the screws 206 are respectively abutted against two ends of one side face of the web 12, and two ends of the other side face of the web 12 are respectively abutted against the first upright 201, so that the web 12 is vertically positioned on one side of the assembled jig frame 20. Then, the other web 12 (shown in fig. 1 (2)) is lifted to the other side of the assembly jig 20, so that two ends of the other web 12 are respectively inserted between the third upright 203 and the fourth upright 204 at two ends of the assembly jig. The screws 206 at the upper and lower ends of the fourth upright 204 are rotated respectively, the ends of the screws 206 respectively abut against the two ends of one side face of the other web 12, and the two ends of the other side face of the other web 12 respectively abut against the third upright 203, so that the other web 12 is positioned upright on the other side of the assembled jig 20. The longitudinal position of the other web 13 is adjusted so that the ends of the two webs 13 are flush.
1.2 A side plate 11 is installed, one side plate 11 (shown in (3) in fig. 1) is firstly lifted and moved between the fifth upright rod 205 at the right end of the assembly jig frame 20 and the right ends of the two webs 12, and then the other side plate 11 (shown in (4) in fig. 1) is lifted and moved between the fifth upright rod 205 at the left end of the assembly jig frame 20 and the left ends of the two webs 12. The transverse positions of the two side plates 11 are adjusted so that the lengths of the overlapping edges 115 at the four corners of the assembled rectangular frame are consistent. And then, respectively rotating the screw rods 206 at the upper end and the lower end of the fifth upright rod 205, wherein the ends of the screw rods 206 respectively lean against the two ends of the outer side surface of the side plate 11, and the two ends of the inner side surface of the side plate 11 respectively lean against the corresponding ends of the two webs 12, thereby completing the assembly and positioning of the reinforced concrete prefabricated box sleeve unit 10.
2) Welding formation of reinforced concrete prefabricated box unit 10
2.1 The steel plate embedded part 2 and the adjacent angle steel embedded part 3 are sequentially welded at right angles on the inner side and the outer side of the joint of the two ends of the side plate 11 and the end heads of the web plate 12, and the inner side and the outer side of the adjacent side plate 11 and the inner side and the outer side of the web plate 12 are welded in a crossed manner during welding, and are sequentially welded in a crossed manner in the diagonal direction of the reinforced concrete prefabricated box unit 10, so that the deformation of the welded reinforced concrete prefabricated box unit 10 can be reduced.
2.2 After the two ends of the side plate 11 and the end heads of the web plate 12 are assembled and welded at one height, a plurality of diagonal ribs 4 at four corners of the reinforced concrete prefabricated box unit 10 and a plurality of vertical lacing wires 6 and a plurality of transverse lacing wires 7 at the center of the reinforced concrete prefabricated box unit 10 are sequentially welded in the same height of the reinforced concrete prefabricated box unit 10, so that the welded reinforced concrete prefabricated box unit 10 is prevented from deforming and expanding when concrete is poured.
2.3 In the height direction of the reinforced concrete prefabricated box unit 10, repeating the processes of steps 2.1) and 2.2) for a plurality of times, and gradually completing the assembly welding of the reinforced concrete prefabricated box unit 10.
3) Construction of reinforced concrete prefabricated pouring jacket cofferdam
3.1 After leveling the river bed in the cofferdam box construction area, a diver adopts a hoisting mode that a crawler crane is used for hoisting 4 steel wire ropes on 8 hoisting points at the upper end of the reinforced concrete prefabricated box unit 10 through a main hoisting steel wire rope, the reinforced concrete prefabricated box unit 10 is hoisted into a sinking area, and the direction of the side plates 11 is along the water flow direction shown by arrows. In the sinking process, the windlass is used for carrying out azimuth adjustment on the reinforced concrete prefabricated box unit, so that the deviation of the reinforced concrete prefabricated box unit 10 caused by water flow is prevented.
3.2 After the reinforced concrete prefabricated box unit 10 is lifted in place, checking by using a total station, and if the deviation exceeds the allowable range, carrying out azimuth adjustment on the reinforced concrete prefabricated box unit 10 again by using a winch until the longitudinal axis of the reinforced concrete prefabricated box unit is aligned with the lofting axis, thereby completing the positioning of the reinforced concrete prefabricated box unit 10. Then, pouring concrete in the first reinforced concrete prefabricated box unit;
3.3 Repeating the related processes of the steps 3.1) to 3.2), completing the positioning of the second reinforced concrete prefabricated box unit 10, enabling the end heads of the side plates 115 on one side of the second reinforced concrete prefabricated box unit 10 to respectively prop against the end heads of the side plates 115 corresponding to the first reinforced concrete prefabricated box unit 10 to form a compartment 101, inserting channel steel water stop bars 116 at the joint positions of the end heads of the side plates 115, and then pouring underwater concrete in the compartment 101 to complete the pouring of concrete in the second reinforced concrete prefabricated box unit 10. And so on, the concrete pouring in the third to nth reinforced concrete prefabricated box units 10 is completed one by one, thereby completing the construction of the reinforced concrete prefabricated box cofferdam.
In addition to the above embodiments, other embodiments of the present invention are possible, and all technical solutions formed by equivalent substitution or equivalent transformation are within the scope of the present invention.
Claims (1)
1. The construction method of the reinforced concrete prefabricated box cofferdam comprises a plurality of reinforced concrete prefabricated box units which are connected side by side, wherein each reinforced concrete prefabricated box unit comprises 2 side plates and 2 webs, the height H1 of each side plate is equal to the height H2 of each web, the width B1 of each side plate is smaller than the width B2 of each web, longitudinal hidden beams and transverse hidden beams are respectively arranged in each side plate and each web at intervals, the longitudinal hidden beams and the transverse hidden beams are crisscrossed to form a grid shape, the thickness of each longitudinal hidden beam and the thickness of each transverse hidden beam are equal to the thickness of the corresponding side plate and the thickness of the corresponding web, and a reinforcement cage is respectively arranged in each longitudinal hidden beam and each transverse hidden beam Liang Nafen; the longitudinal dark beams and the transverse dark beams are respectively arranged at the edges of the two longitudinal sides and the upper end and the lower end of the web plate; the steel plate embedded parts are welded and fixed on the side plates and the web plate respectively, and the angle steel embedded parts are welded and fixed on the edges of the two longitudinal sides of the web plate respectively at intervals; 2 webs are respectively embedded between the inner side surfaces of 2 side plates, a plurality of steel plate embedded parts on the two longitudinal sides of the side plates and angle steel embedded parts corresponding to the edges on the two longitudinal sides of the adjacent webs are welded into rectangular reinforced concrete prefabricated box units, and the two ends of each reinforced concrete prefabricated box unit are respectively provided with a lapping edge; the lapping edge end surfaces of the reinforced concrete prefabricated box sleeve units are spliced into a cofferdam in a propping way; two ends of a plurality of diagonal lacing wires which are arranged up and down at intervals are respectively welded and fixed between the inner side plates of four corners of the reinforced concrete prefabricated box unit and the adjacent web plates, two ends of a plurality of vertical lacing wires which are arranged up and down at intervals are respectively welded and fixed between the inner side centers of the corresponding side plates, two ends of a plurality of horizontal lacing wires which are arranged up and down at intervals are respectively welded and fixed between the inner side centers of the corresponding web plates, and welding points are respectively positioned on the embedded anchor bars corresponding to the hidden beam crossing points; the 2 pre-buried lifting ring assemblies are symmetrically fixed on the lower part of the side plate or the lower part of the web plate respectively, the pre-buried lifting ring assemblies comprise a bottom plate and lifting bolts, the bottom plate is symmetrically welded and fixed on the corresponding anchor bar end of the lower part of the side plate or the lower part of the web plate respectively, and the lower part of the lifting bolts is welded and fixed on the center of the bottom plate; the lower ends of the 2 groups of hanging plate components are symmetrically fixed on the upper end of the side plate or the upper end of the web plate respectively, the hanging plate components comprise 2 hanging plates with hanging holes at the upper ends, the inner sides of the hanging plates are welded and fixed with two ends of 2 rows of transverse ribs which are vertically arranged at intervals respectively, the upper ends of the hanging plate components extend out of the end face of the upper end of the side plate or the end face of the upper end of the web plate respectively, and the lower parts of the hanging plate components are symmetrically clamped and pre-buried and fixed at positions corresponding to the upper end of the side plate or the upper end of the web plate; the construction method is characterized by comprising the following steps of:
1) Assembled reinforced concrete prefabricated box unit
1.1 Firstly, lifting and conveying a web plate to one side of an assembly jig frame, enabling two ends of the web plate to be respectively inserted between a first upright post and a second upright post at two ends of the assembly jig frame, respectively rotating screw rods at the upper end and the lower end of the second upright post, enabling screw rod ends to respectively lean against two ends of one side face of the web plate, enabling two ends of the other side face of the web plate to respectively lean against the first upright post, and vertically positioning the web plate on one side of the assembly jig frame; then lifting the other web plate to the other side of the assembly jig frame, enabling two ends of the other web plate to be respectively inserted between a third vertical rod and a fourth vertical rod at two ends of the assembly jig frame, respectively rotating screw rods at the upper end and the lower end of the fourth vertical rod, enabling the end heads of the screw rods to respectively abut against two ends of one side surface of the other web plate, enabling two ends of the other side surface of the other web plate to respectively abut against the third vertical rod, and vertically positioning the other web plate on the other side of the assembly jig frame; adjusting the longitudinal position of the other web plate to enable the end heads of the two web plates to be level;
1.2 Firstly, lifting one side plate to a position between a fifth vertical rod at one end of the assembly jig frame and one end of two webs, and then lifting the other side plate to a position between the fifth vertical rod at the other end of the assembly jig frame and the other end of the two webs; the transverse positions of the two side plates are regulated, so that the length of the lapping edges outside four corners of the assembled rectangular frame is consistent; then respectively rotating the screw rods at the upper end and the lower end of the fifth upright rod, wherein the screw rod ends respectively lean against two ends of one side surface of the side plate, and two ends of the other side surface of the side plate respectively lean against corresponding ends of the two webs, so that the assembly and the positioning of the reinforced concrete prefabricated box sleeve unit are completed;
2) Welding forming of reinforced concrete prefabricated box unit
2.1 The steel plate embedded parts and the adjacent angle steel embedded parts are sequentially welded at right angles on the inner side and the outer side of the joint of the two ends of the side plate and the end heads of the web plate, and the inner side and the outer side of the adjacent side plate and the inner side of the web plate are welded in a crossing manner during welding and are sequentially welded according to the height direction of the opposite angles of the reinforced concrete prefabricated box sleeve unit;
2.2 Simultaneously welding a plurality of diagonal tendons in four corners of the reinforced concrete prefabricated box unit and a plurality of vertical lacing wires and a plurality of horizontal lacing wires in the center of the reinforced concrete prefabricated box unit in the reinforced concrete prefabricated box unit;
2.3 Repeating the steps 2.1) and 2.2) for a plurality of times in the height direction of the reinforced concrete prefabricated box unit, and sequentially completing the welding of the reinforced concrete prefabricated box unit;
construction of 3 reinforced concrete prefabricated pouring jacket cofferdam
3.1 After leveling the river bed in the cofferdam box construction area, a diver uses a crawler crane hook to hoist 4 steel wire ropes on 8 hoisting points at the upper end of the reinforced concrete prefabricated box unit through a main crane steel wire rope, the reinforced concrete prefabricated box unit is hoisted into a sinking area, and the sideboard is enabled to follow the water flow direction; in the sinking process, a winch is used for carrying out azimuth adjustment on the reinforced concrete prefabricated box unit, so that the box deviation caused by water flow is prevented;
3.2 After the reinforced concrete prefabricated box unit is lifted in place, checking by using a total station, if the deviation exceeds the allowable range, carrying out azimuth adjustment on the reinforced concrete prefabricated box unit again by using a winch until the longitudinal axis of the reinforced concrete prefabricated box unit is aligned with the lofting axis, and finishing the positioning of the reinforced concrete prefabricated box unit; then, completing concrete pouring in the first reinforced concrete prefabricated box unit;
3.3 Repeating the steps 3.1) to 3.2), completing the positioning of the second reinforced concrete prefabricated box unit, enabling the side plate ends on two sides of the second reinforced concrete prefabricated box unit to respectively prop against the side plate ends on two sides of the first reinforced concrete prefabricated box unit to form a compartment, inserting a channel steel water stop strip at the joint of the side plate ends, and then pouring underwater concrete in the compartment to complete the concrete pouring in the second reinforced concrete prefabricated box unit; and the like, completing the concrete pouring in the third to nth reinforced concrete prefabricated box units one by one, and completing the construction of the reinforced concrete prefabricated box cofferdam.
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| CN101225663A (en) * | 2008-01-31 | 2008-07-23 | 山东省路桥集团有限公司 | Steel boxed cofferdam and recovery method thereof |
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| CN213062061U (en) * | 2020-07-15 | 2021-04-27 | 烟建集团有限公司 | Sectional type steel pouring jacket cofferdam |
| CN216194417U (en) * | 2021-10-21 | 2022-04-05 | 中交天津港湾工程设计院有限公司 | Steel assembled bottomless unloading caisson wharf structure |
| CN114319396A (en) * | 2021-12-17 | 2022-04-12 | 中交二公局东萌工程有限公司 | Construction method of bottomless box cofferdam suitable for underwater complex geological conditions |
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| JP2009074269A (en) * | 2007-09-19 | 2009-04-09 | Ohbayashi Corp | Underwater structure reinforcing method and underwater structure |
| CN101225663A (en) * | 2008-01-31 | 2008-07-23 | 山东省路桥集团有限公司 | Steel boxed cofferdam and recovery method thereof |
| CN106284304A (en) * | 2016-08-09 | 2017-01-04 | 上海市机械施工集团有限公司 | A kind of pre-manufactured steel casing diaphram wall and construction method thereof |
| CN213062061U (en) * | 2020-07-15 | 2021-04-27 | 烟建集团有限公司 | Sectional type steel pouring jacket cofferdam |
| CN216194417U (en) * | 2021-10-21 | 2022-04-05 | 中交天津港湾工程设计院有限公司 | Steel assembled bottomless unloading caisson wharf structure |
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