CN111663548A - Cofferdam structure for construction without water cut and construction method for mounting and dismounting cofferdam without water cut - Google Patents
Cofferdam structure for construction without water cut and construction method for mounting and dismounting cofferdam without water cut Download PDFInfo
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- CN111663548A CN111663548A CN202010671847.8A CN202010671847A CN111663548A CN 111663548 A CN111663548 A CN 111663548A CN 202010671847 A CN202010671847 A CN 202010671847A CN 111663548 A CN111663548 A CN 111663548A
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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
- E02D15/08—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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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Abstract
The invention discloses a construction cofferdam structure without stopping water, which comprises a cofferdam structure with an opening at the upper end, wherein the construction side wall of the cofferdam structure comprises an upper half wall, a connecting frame and a lower half wall which are sequentially welded from top to bottom in the same plane, the connecting frame encloses a working opening for construction, a water stop strip is arranged on the surface of the connecting frame facing the side wall of a water storage structure along the circumferential direction, and the water stop strip is used for pressing the side wall of the water storage structure and sealing the working opening; the connecting frames on the left side and the right side of the construction side wall are respectively connected with a hydraulic pressing mechanism; the invention also discloses a corresponding construction method for installing and dismantling the cofferdam without stopping water. The invention is not only suitable for the side wall of the inclined water storage structure, but also suitable for the side wall of the vertical water storage structure, has wider adaptability compared with a structure which realizes sealing by depending on self weight and the side wall of the water storage structure, and has low cost and easy installation and disassembly.
Description
Technical Field
The invention relates to a non-stop repair (opening) cofferdam for a pool and a water delivery channel, in particular to an arc steel plate cofferdam and a non-stop mounting and dismounting construction method.
Background
During the operation of water storage structures such as pump stations, water plants, channels and the like, according to the design requirements of later engineering, water diversion ports (gates, pipelines and the like) are required to be installed or leaking stoppage and repair are required to be carried out on the walls of the water storage structures such as concrete pool walls, channel concrete vertical walls and the like under the condition of no water cut.
The method for mounting the water diversion port by opening the pressure-bearing concrete pool wall in the current market of China mainly comprises the steps of firstly, cutting off water in sections, protecting a flat steel cofferdam, then, opening and plugging concrete, and finally, dismantling the cofferdam and recovering water supply.
The water supply safety problem of people is involved in the water supply of the water plant pool and the water supply channel, and the temporary water cut-off caused by the construction can cause very large economic loss and social influence; the conventional flat water retaining cofferdam not only has high processing, mounting and dismounting cost, but also has long construction period and increases temporary water stopping time.
The applicant firstly considers a structure which realizes sealing by self weight and the side wall of a water storage structure when organizing and designing a cofferdam structure without water stop, and the structure has the defects that the weight is large, otherwise, the sealing is not enough to be formed between the cofferdam structure and the side wall of the water storage structure; the second defect is that the cofferdam is only suitable for the side wall of the inclined water storage structure, and no matter the multiple cofferdams can not tightly press the side wall of the water storage structure by the dead weight, the sealing can not be formed for the vertical or nearly vertical side wall of the water storage structure. Among other things, the first disadvantage further results in higher material costs, inconvenience in manufacturing, transportation, installation, and disassembly, lower efficiency of installation and disassembly, and the like.
Disclosure of Invention
The invention aims to provide a non-stop construction cofferdam structure which has the advantages of simple and light structure, lower cost, higher mounting and dismounting efficiency and is suitable for the side walls of vertical and inclined water storage structures.
In order to achieve the purpose, the construction cofferdam structure without stopping water comprises a cofferdam structure with an opening at the upper end, wherein the cofferdam structure comprises a construction side wall which is attached to the side wall of a water storage structure to be constructed, an enclosure side wall and a bottom plate which are as high as the construction side wall, and the construction side wall, the enclosure side wall and the bottom plate are connected with each other to form the cofferdam structure;
the construction side wall comprises an upper half wall, a connecting frame and a lower half wall which are sequentially welded from top to bottom in the same plane, the connecting frame encloses a working opening for construction, and the widths of the enclosure side wall, the upper half wall, the lower half wall and the working opening are the same; the top end of the upper half wall is flush with the top end of the enclosing side wall, and the height of the lower half wall is 500 +/-200 mm; the surface of the connecting frame facing the side wall of the water storage structure is circumferentially provided with a water stop strip which is used for tightly pressing the side wall of the water storage structure and sealing the working opening;
the connecting frames on the left side and the right side of the construction side wall are respectively connected with a hydraulic pressing mechanism;
the hydraulic pressing mechanism comprises a hydraulic cylinder, an extension rod of the hydraulic cylinder is fixedly connected with an extension rod which is coaxially arranged, and the upper end of the extension rod is hinged with the connecting frame;
the lower end of the cylinder body of the hydraulic cylinder is hinged with an anti-skid steel shoe which is used for being supported on the bottom wall of a water storage structure; the included angle between the axis of the extension rod of the hydraulic cylinder and the plumb line is 15 +/-5 degrees.
The construction side wall, the enclosure side wall and the bottom plate of the cofferdam structure are all made of steel, and the construction side wall, the enclosure side wall and the bottom plate are welded together; the extension rod is a steel pipe and is welded with the extension rod of the hydraulic cylinder.
The antiskid steel boots comprise horizontal steel plates, the horizontal steel plates are upwards connected with hinge shaft sleeves, and the hinge shaft sleeves are hinged with the lower ends of the cylinder bodies of the hydraulic cylinders; the horizontal steel plate is downwards connected with anti-slip teeth made of metal, and the anti-slip teeth are used for being supported on the bottom wall of the water storage structure; the horizontal section of the cofferdam structure is in a semicircular arch shape.
The water stop strip adopts a P-shaped water stop strip, a cavity is arranged in the P-shaped water stop strip, the cavity of the P-shaped water stop strip is connected with a vent pipe, and the vent pipe is connected with an air compressor; an air valve is arranged on the vent pipe; the two sets of hydraulic pressing mechanisms are connected with a hydraulic control system, and the hydraulic control system is used for controlling the two sets of hydraulic pressing mechanisms to synchronously act.
The inner surface of the enclosing side wall is provided with a reinforcing rib.
The invention also provides a construction method for mounting and dismounting the cofferdam without water cut, which is carried out by using the cofferdam construction structure without water cut, and comprises the following steps:
the first step is processing;
the first step comprises the steps of processing a water stop strip, processing an anti-slip steel boot, processing a hydraulic cylinder, processing a construction side wall of a cofferdam structure, processing an enclosure side wall of the cofferdam structure and processing a bottom plate of the cofferdam structure, which are not sequentially carried out;
the water stop strip processing is to intercept a P-shaped water stop strip with the same circumferential length as the connecting frame;
the second step is assembling;
welding the construction side wall of the cofferdam structure, the enclosing side wall of the cofferdam structure and the bottom plate of the cofferdam structure to form the cofferdam structure with an open upper end;
the connecting frame surrounds the construction side wall, the pressing plate is attached to the P-type water stop strip, the bolts penetrate through the pressing plate and the P-type water stop strip and are in threaded connection with the connecting frame, and the bolts are screwed down so that the P-type water stop strip is pressed on the connecting frame; the cavity part in the P-shaped water stop strip is positioned outside the pressure plate and is used for being in sealing fit with the side wall of the water storage structure; the bolts are arranged on the pressure plate every 300 mm;
the bottom end of the cylinder body of the hydraulic cylinder is hinged with the anti-skid steel shoe through a hinge shaft sleeve of the anti-skid steel shoe, and the end part of the extension rod is hinged with the connecting frame;
connecting a cable between the anti-skid steel shoe and the top of the construction side wall or the top of the containment side wall, and enabling an included angle between the axis of the extension rod of the hydraulic cylinder and the plumb line to fall within the range of 15 +/-5 degrees through the cable; preferably, a connecting ring is welded at the top of the construction side wall or the top of the enclosure side wall, and a cable is connected between the connecting ring and the anti-skidding steel boot.
Thirdly, launching the cofferdam in place;
marking and positioning on the side wall of the water storage structure needing opening or maintenance, marking the water inlet depth and the water inlet position of the cofferdam structure, punching a hole on the side wall of the water storage structure at the upper part of the construction side wall of the preset cofferdam structure, and putting an expansion pipe of an expansion bolt;
lifting the whole cofferdam structure by using a crane, then putting in water, continuing to put down after the anti-skid steel boots contact the bottom, and stopping putting down until the P-shaped water stop strips at the connecting frame are tightly attached to the side wall of the water storage structure and the cofferdam structure does not fall under the action of gravity, so that the crane releases the cofferdam structure;
the fourth step is reinforcement;
using expansion bolts to penetrate through the construction side wall of the cofferdam structure and extend into the expansion pipes, and screwing the expansion bolts to fix the upper part of the cofferdam structure on the side wall of the water storage structure;
starting the hydraulic cylinders of the two sets of hydraulic pressing mechanisms through a hydraulic control system, enabling extension rods of the two hydraulic cylinders to synchronously extend out, pressing a construction side wall and a P-type water stop strip of the cofferdam structure on a side wall of a water storage structure, and forming sealing at the periphery of a working opening;
the fifth step is pumping water;
the submersible pump is used for pumping and discharging water in the cofferdam structure, so that the water level in the cofferdam structure is lower than the lower end of the working opening, and at the moment, workers can perform opening or maintenance construction on the side wall of the water storage structure in the cofferdam, and construction without stopping water is realized.
The processing of the enclosing side wall of the cofferdam structure comprises the following steps: processing a finished steel pipe or a steel plate into a cylinder by using a plate bending machine, dividing the finished steel pipe or the cylinder into two halves along an axis to form two enclosing side walls of the cofferdam structures, wherein the section of the enclosing side wall of each cofferdam structure is in a semicircular arch shape;
the processing of the construction side wall of the cofferdam structure comprises the following steps: sequentially welding the upper half wall, the connecting frame and the lower half wall from top to bottom in the same plane to form a construction side wall;
the bottom plate of the cofferdam structure is processed by cutting a plane steel plate into a semi-circular arch matched with the enclosing side wall of the cofferdam structure;
the hydraulic cylinder processing is to coaxially weld an extension rod made of a steel pipe on an extension rod of the hydraulic cylinder;
the processing of the anti-skid steel boots comprises the steps of firstly manufacturing a square steel plate, then welding a hinged shaft sleeve on the upper surface of the square steel plate, and welding 3-5 anti-skid steel teeth on the lower surface of the square steel plate; the size of the square steel plate is preferably 200 mm × 10 mm.
The method also comprises a sixth step, wherein the sixth step is cofferdam dismantling;
after the construction of the side wall of the water storage structure is completed, the hydraulic control system starts the hydraulic cylinders of the two sets of hydraulic pressing mechanisms to enable the extension rods of the two hydraulic cylinders to be synchronously retracted, and the P-shaped water stop strip does not press the side wall of the water storage structure any more so as to lose the sealing effect; and (4) removing the expansion bolts on the upper part of the cofferdam structure, and hoisting the cofferdam structure by using the crane integrally after water is injected into the cofferdam structure at the working opening part until the water surfaces inside and outside the cofferdam structure are flush, thereby completing the cofferdam removal work.
In the fifth step, when the staff observes that the water leakage at the working opening is serious and the water level is possibly raised to the working opening within the time required by construction, the staff opens the air valve, starts the air compressor to charge air into the cavity of the P-shaped water stop strip, so that the P-shaped water stop strip is expanded to improve the sealing degree of the working opening; and after the P-shaped water stop strip expands, the air valve and the air compressor are closed.
In the fifth step, if the cavity of the P-shaped water stop strip is inflated, the staff still observes that the water leakage at the working opening is serious, and when the water level possibly rises to the working opening within the time required by construction, the staff sets a small-flow submersible pump in the cofferdam structure and starts a small-flow water starting pump to continuously discharge the accumulated water in the cofferdam structure until the construction is finished; the water discharge speed of the small-flow submersible pump is matched with the water leakage speed at the working opening.
The invention has the following advantages:
if a hydraulic cylinder (jack) is adopted underwater, one end (such as a cylinder body) of the hydraulic cylinder is propped against an underwater backrest structure which is parallel or approximately parallel to the side wall of the water storage structure to be constructed, and the other end (such as an extension rod) of the hydraulic cylinder is propped against the cofferdam structure, horizontal force for pressing the side wall of the water storage structure can be applied to the cofferdam structure, so that sealing is formed between the cofferdam structure and the side wall of the water storage structure, at the moment, water in the cofferdam structure can be pumped out, and the side wall of the water storage structure is constructed in the cofferdam. It is difficult to have an underwater back rest structure parallel or nearly parallel to the side walls of the impoundment structure to be constructed underwater, just adjacent to the side walls of the impoundment structure.
By adopting the structure of the invention, the cofferdam structure can be conveniently pressed on the side wall of the water storage structure to form sealing through the hydraulic cylinder on the premise of not needing an underwater backrest structure, thereby getting rid of the dependence on the underwater backrest structure and being suitable for the construction of the side wall of any water storage structure.
The force applied by the hydraulic cylinder to the connecting frame through the extension rod forms a vertical component force upward along the side wall of the water storage structure and a horizontal component force perpendicular to the side wall of the water storage structure. When the side wall of the water storage structure is vertical or close to vertical, the included angle between the axis of the extension rod of the hydraulic cylinder and the plumb line is 15 +/-5 degrees, so that the vertical component force can be ensured to be far greater than the horizontal component force, the friction force between the anti-skidding steel shoe and the bottom wall of the water storage structure is ensured to be greater than the horizontal component force, the anti-skidding steel shoe is prevented from moving towards the direction far away from the side wall of the water storage structure under the action of the reaction force of the horizontal component force, the horizontal component force is further ensured not to be too small or even disappear, and a good sealing effect is generated by utilizing enough horizontal component.
In a word, the included angle between the axis of the extension rod of the hydraulic cylinder and the plumb line is 15 +/-5 degrees, so that the anti-skidding steel shoe can be prevented from skidding, and enough pressing force (horizontal component force) is ensured to keep the sealing of the working opening.
The invention can inflate the cavity of the P-shaped water stop strip to expand the P-shaped water stop strip, thereby improving the sealing property of the working opening.
The construction method for installing and dismantling the cofferdam without stopping water has simple steps, the cofferdam structure is convenient to manufacture, install and dismantle, the cofferdam structure is convenient to be repeatedly used in the construction of different water storage structures, and the construction cost is reduced.
The drainage speed of the small-flow submersible pump is matched with the water leakage speed of the working opening, so that the construction while pumping water is realized, the accuracy in the engineering is further reduced, and the construction without stopping water can be realized even if the P-type water stop strip does not have good sealing performance.
The invention is not only suitable for the side wall of the inclined water storage structure, but also suitable for the side wall of the vertical water storage structure, has wider adaptability compared with a structure which realizes sealing with the side wall of the water storage structure by self weight (not suitable for the side wall of the vertical water storage structure), and has low cost and easy installation and disassembly.
Drawings
FIG. 1 is a schematic structural view of a cofferdam structure for construction without stopping water supply of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is an enlarged view at B in FIG. 2;
FIG. 4 is an enlarged view at A of FIG. 1;
fig. 5 is a right structural view of the construction side wall of fig. 1.
Detailed Description
As shown in fig. 1 to 5, the non-stop construction cofferdam structure of the invention comprises a cofferdam structure with an open upper end, the cofferdam structure comprises a construction side wall 1 for being attached to a side wall 5 of a water storage structure to be constructed, an enclosure side wall 2 with the same height as the construction side wall 1 and a bottom plate 3, and the construction side wall 1, the enclosure side wall 2 and the bottom plate 3 are connected with each other to form the cofferdam structure;
the construction side wall 1 comprises an upper half wall 101, a connecting frame 4 and a lower half wall 102 which are sequentially welded from top to bottom in the same plane, the connecting frame 4 encloses a working opening 6 for construction, and the widths of the enclosure side wall 2, the upper half wall 101, the lower half wall 102 and the working opening 6 are the same; the top end of the upper half wall 101 is flush with the top end of the enclosure side wall 2, and the height of the lower half wall 102 is 500 +/-200 mm (the height of the lower half wall 102 is the maximum depth of water accumulation and water pumping work); a water stop strip is arranged on the surface, facing the side wall 5 of the water storage structure, of the connecting frame 4 along the circumferential direction, and the water stop strip is used for tightly pressing the side wall of the water storage structure and sealing the working opening 6;
the connecting frame 4 is preferably a square frame, and can also be a frame with other shapes (such as a round or oval shape), and can be made of channel steel or angle steel. The working opening 6 is in fig. 1 located opposite the opening 8 of the side wall of the water storage structure. The design water level is shown at 9 in fig. 1.
The connecting frames 4 on the left side and the right side of the construction side wall 1 are respectively connected with a hydraulic pressing mechanism;
the hydraulic pressing mechanism comprises a hydraulic cylinder 10 (the jack is one of the hydraulic cylinders 10, preferably a 5-ton jack), an extension rod of the hydraulic cylinder 10 is fixedly connected with an extension rod 11 which is coaxially arranged, and the upper end of the extension rod 11 is hinged with the connecting frame 4; specifically, the connecting frame 4 preferably adopts a channel steel structure, and the upper end of the extension rod 11 is hinged to the channel steel structure through a hinge shaft.
The lower end of the cylinder body of the hydraulic cylinder 10 is hinged with an anti-skid steel shoe which is used for being supported on the bottom wall of a water storage structure (such as the bottom of a water pool); the axis of the extension rod of the hydraulic cylinder 10 is at an angle of 15 + -5 degrees (including 10 degrees and 20 degrees) to the vertical.
In the invention, the hydraulic system preferably adopts pure water to replace hydraulic oil, so that water pollution can be avoided.
Specifically, a construction side wall 1, an enclosure side wall 2 and a bottom plate 3 of the cofferdam structure are all made of steel and have the uniform thickness of 5-10 mm, and the construction side wall 1, the enclosure side wall 2 and the bottom plate are welded together; the extension rod 11 is a steel pipe (preferably, a steel pipe with a diameter of 110 mm) and the extension rod 11 is welded with the extension rod of the hydraulic cylinder 10.
The antiskid steel boots comprise horizontal steel plates 12, the horizontal steel plates 12 are upwards connected with hinge shaft sleeves 13, and the hinge shaft sleeves 13 are hinged with the lower ends of the cylinder bodies of the hydraulic cylinders 10; the horizontal steel plate 12 is downwards connected with an anti-slip tooth 14 made of metal, and the anti-slip tooth 14 is used for being supported on the bottom wall of the water storage structure; the horizontal section of the cofferdam structure is in a semicircular arch shape.
The water stop strip 7 adopts a P-shaped water stop strip, a cavity 15 is arranged in the P-shaped water stop strip, the cavity 15 of the P-shaped water stop strip is connected with a vent pipe, and the vent pipe is connected with an air compressor; an air valve is arranged on the vent pipe; the two sets of hydraulic pressing mechanisms are connected with a hydraulic control system, and the hydraulic control system is used for controlling the two sets of hydraulic pressing mechanisms to synchronously act.
The inner surface of the enclosure side wall 2 is provided with a reinforcing rib made of angle steel. The ribs, air ducts and air compressor are conventional components and are not shown.
The invention also discloses a construction method for mounting and dismounting the cofferdam without water cut, which is carried out by using the cofferdam construction structure without water cut, and comprises the following steps:
the first step is processing;
the first step comprises the steps of processing a water stop bar 7, processing an anti-slip steel boot, processing a hydraulic cylinder 10, processing a construction side wall 1 of the cofferdam structure, processing an enclosure side wall 2 of the cofferdam structure and processing a bottom plate 3 of the cofferdam structure in no sequence;
the water stop strip 7 is processed by cutting a P-shaped water stop strip with the same circumferential length as the connecting frame 4;
the second step is assembling;
welding a construction side wall 1 (comprising an upper half wall 101, a connecting frame 4 made of channel steel and a lower half wall 102), a containment side wall 2 of the cofferdam structure and a bottom plate of the cofferdam structure to form the cofferdam structure with an open upper end;
the connecting frame 4 surrounding the construction side wall 1 is attached to the P-shaped water stop strip through a pressing plate 17, a bolt 16 penetrates through the pressing plate 17 and the P-shaped water stop strip and is in threaded connection with the connecting frame 4, and the bolt 16 is screwed down so as to press the P-shaped water stop strip on the connecting frame 4; the cavity 15 in the P-shaped water stop strip is partially positioned outside the pressure plate 17 and is used for sealing and matching with the side wall 5 of the water storage structure; the bolts 16 are arranged on the pressure plate 17 every 300 mm;
the bottom end of the cylinder body of the hydraulic cylinder 10 is hinged with the antiskid steel shoe through a hinge shaft sleeve 13 of the antiskid steel shoe, and the end part of the extension rod 11 is hinged with the connecting frame 4 through a hinge shaft;
a cable 19 is connected between the anti-skid steel shoe and the top of the construction side wall 1 or the top of the enclosure side wall 2, and the included angle between the axis of the extension rod of the hydraulic cylinder 10 and the plumb line is within the range of 15 +/-5 degrees through the cable 19; preferably, a connecting ring 18 is welded on the top of the construction side wall 1 or the top of the enclosing side wall 2, and a cable 19 is connected between the connecting ring 18 and the antiskid steel shoe.
Thirdly, launching the cofferdam in place;
marking and positioning on a side wall 5 of a water storage structure needing opening or maintenance, marking the water inlet depth and the water inlet position of a cofferdam structure, punching a hole in the side wall 5 of the water storage structure at the upper part of a construction side wall 1 of a preset cofferdam structure, and putting an expansion pipe of an expansion bolt;
lifting the whole cofferdam structure by using a crane, then putting in water, continuing to put down after the anti-skid steel boots contact the bottom (the angle means that the anti-skid steel boots fall on the bottom wall of the water storage structure), and stopping putting down until the P-shaped water stop strips at the connecting frame are tightly attached to the side wall 5 of the water storage structure and the cofferdam structure does not fall under the action of gravity, so that the crane releases the cofferdam structure;
the fourth step is reinforcement;
using expansion bolts to penetrate through the construction side wall 1 of the cofferdam structure and extend into the expansion pipes, and screwing the expansion bolts to fix the upper part of the cofferdam structure on the side wall 5 of the water storage structure;
starting the hydraulic cylinders 10 of the two sets of hydraulic pressing mechanisms through a hydraulic control system, enabling extension rods 11 of the two hydraulic cylinders 10 to synchronously extend out, pressing the construction side wall 1 and the P-type water stop strip of the cofferdam structure on the side wall 5 of the water storage structure, and forming sealing at the periphery of the working opening 6;
the fifth step is pumping water;
the water in the cofferdam structure is pumped and discharged by the high-flow submersible pump, so that the water level in the cofferdam structure is lower than the lower end of the working opening 6, and at the moment, workers can perform opening or maintenance construction on the side wall 5 of the water storage structure in the cofferdam, and the construction without stopping water is realized.
The processing of the containment side wall 2 of the cofferdam structure is as follows: the method comprises the following steps of processing a steel plate with a preset size into a cylinder by using a finished steel pipe with a preset size or a plate bending machine, dividing the finished steel pipe or the cylinder into two halves along an axis to form two enclosing side walls 2 of the cofferdam structures, wherein the section of each enclosing side wall 2 of each cofferdam structure is in a semi-circular arc shape;
the processing of the construction side wall 1 of the cofferdam structure is as follows: sequentially welding the upper half wall 101, the connecting frame 4 and the lower half wall 102 from top to bottom in the same plane to form a construction side wall 1;
the bottom plate of the cofferdam structure is processed by cutting a plane steel plate into a semicircular arch matched with the enclosing side wall 2 of the cofferdam structure;
the hydraulic cylinder 10 is processed by coaxially welding an extension rod 11 made of a steel pipe (with the diameter of 110 mm) on an extension rod of the hydraulic cylinder 10 (specifically, a 5-ton jack);
the processing of the anti-skid steel boots (manufacturing two sets of anti-skid steel boots) comprises the steps of manufacturing a square steel plate, welding a hinged shaft sleeve 13 on the upper surface of the square steel plate, and welding 3-5 (including two end values) anti-skid steel teeth on the lower surface of the square steel plate; the size of the square steel plate is preferably 200 mm × 10 mm.
The method also comprises a sixth step, wherein the sixth step is cofferdam dismantling;
after the construction (opening or maintenance) of the side wall 5 of the water storage structure is finished, the hydraulic cylinders 10 of the two sets of hydraulic pressing mechanisms are started through the hydraulic control system, so that the extension rods 11 of the two hydraulic cylinders 10 are synchronously retracted, and the P-type water stop strip does not press the side wall 5 of the water storage structure any more, so that the sealing effect is lost; and (4) removing the expansion bolts on the upper part of the cofferdam structure, and hoisting the cofferdam structure by using the crane integrally after the working opening 6 injects water into the cofferdam structure until the water surfaces inside and outside the cofferdam structure are flush, thereby completing the cofferdam removal work.
In the fifth step, when the staff observes that the water leakage at the working opening 6 is serious and the water level is possibly raised to the working opening 6 within the time required by construction, the staff opens the air valve, starts the air compressor to inflate the cavity 15 of the P-shaped water stop strip, so that the P-shaped water stop strip is expanded to improve the sealing degree of the working opening; and after the P-shaped water stop strip expands, the air valve and the air compressor are closed. The discharge pressure of the air compressor was 2 mpa.
In the fifth step, if the cavity 15 of the P-type water stop strip is inflated, the staff still observes that the water leakage at the working opening 6 is serious and the water level possibly rises to the working opening 6 within the time required by construction, the staff sets a small-flow submersible pump (a submersible pump with a larger flow compared with the first water pumping) in the cofferdam structure and starts a small-flow water starting pump to continuously discharge the accumulated water in the cofferdam structure until the construction is finished; the water discharge speed of the small-flow submersible pump is matched with the water leakage speed at the working opening 6.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (10)
1. The cofferdam structure for construction without stopping water comprises a cofferdam structure with an opening at the upper end, wherein the cofferdam structure comprises a construction side wall, an enclosing side wall and a bottom plate, the construction side wall is attached to the side wall of a water storage structure to be constructed, the enclosing side wall is as high as the construction side wall, and the construction side wall, the enclosing side wall and the bottom plate are connected with each other to form the cofferdam structure; the method is characterized in that:
the construction side wall comprises an upper half wall, a connecting frame and a lower half wall which are sequentially welded from top to bottom in the same plane, the connecting frame encloses a working opening for construction, and the widths of the enclosure side wall, the upper half wall, the lower half wall and the working opening are the same; the top end of the upper half wall is flush with the top end of the enclosing side wall, and the height of the lower half wall is 500 +/-200 mm; the surface of the connecting frame facing the side wall of the water storage structure is circumferentially provided with a water stop strip which is used for tightly pressing the side wall of the water storage structure and sealing the working opening;
the connecting frames on the left side and the right side of the construction side wall are respectively connected with a hydraulic pressing mechanism;
the hydraulic pressing mechanism comprises a hydraulic cylinder, an extension rod of the hydraulic cylinder is fixedly connected with an extension rod which is coaxially arranged, and the upper end of the extension rod is hinged with the connecting frame;
the lower end of the cylinder body of the hydraulic cylinder is hinged with an anti-skid steel shoe which is used for being supported on the bottom wall of a water storage structure; the included angle between the axis of the extension rod of the hydraulic cylinder and the plumb line is 15 +/-5 degrees.
2. The construction cofferdam structure without stopping water according to claim 1, characterized in that: the construction side wall, the enclosure side wall and the bottom plate of the cofferdam structure are all made of steel, and the construction side wall, the enclosure side wall and the bottom plate are welded together; the extension rod is a steel pipe and is welded with the extension rod of the hydraulic cylinder.
3. The construction cofferdam structure without stopping water according to claim 1, characterized in that: the antiskid steel boots comprise horizontal steel plates, the horizontal steel plates are upwards connected with hinge shaft sleeves, and the hinge shaft sleeves are hinged with the lower ends of the cylinder bodies of the hydraulic cylinders; the horizontal steel plate is downwards connected with anti-slip teeth made of metal, and the anti-slip teeth are used for being supported on the bottom wall of the water storage structure; the horizontal section of the cofferdam structure is in a semicircular arch shape.
4. The construction cofferdam structure without stopping water according to any one of claims 1 to 3, wherein: the water stop strip adopts a P-shaped water stop strip, a cavity is arranged in the P-shaped water stop strip, the cavity of the P-shaped water stop strip is connected with a vent pipe, and the vent pipe is connected with an air compressor; an air valve is arranged on the vent pipe; the two sets of hydraulic pressing mechanisms are connected with a hydraulic control system, and the hydraulic control system is used for controlling the two sets of hydraulic pressing mechanisms to synchronously act.
5. The construction cofferdam structure without stopping water of claim 4, wherein: the inner surface of the enclosing side wall is provided with a reinforcing rib.
6. The construction method for installing and dismantling the cofferdam without stopping water by using the cofferdam structure for construction without stopping water in claim 4 is characterized by comprising the following steps:
the first step is processing;
the first step comprises the steps of processing a water stop strip, processing an anti-slip steel boot, processing a hydraulic cylinder, processing a construction side wall of a cofferdam structure, processing an enclosure side wall of the cofferdam structure and processing a bottom plate of the cofferdam structure, which are not sequentially carried out;
the water stop strip processing is to intercept a P-shaped water stop strip with the same circumferential length as the connecting frame;
the second step is assembling;
welding the construction side wall of the cofferdam structure, the enclosing side wall of the cofferdam structure and the bottom plate of the cofferdam structure to form the cofferdam structure with an open upper end;
the connecting frame surrounds the construction side wall, the pressing plate is attached to the P-type water stop strip, the bolts penetrate through the pressing plate and the P-type water stop strip and are in threaded connection with the connecting frame, and the bolts are screwed down so that the P-type water stop strip is pressed on the connecting frame; the cavity part in the P-shaped water stop strip is positioned outside the pressure plate and is used for being in sealing fit with the side wall of the water storage structure; the bolts are arranged on the pressure plate every 300 mm;
the bottom end of the cylinder body of the hydraulic cylinder is hinged with the anti-skid steel shoe through a hinge shaft sleeve of the anti-skid steel shoe, and the end part of the extension rod is hinged with the connecting frame;
connecting a cable between the anti-skid steel shoe and the top of the construction side wall or the top of the containment side wall, and enabling an included angle between the axis of the extension rod of the hydraulic cylinder and the plumb line to fall within the range of 15 +/-5 degrees through the cable;
thirdly, launching the cofferdam in place;
marking and positioning on the side wall of the water storage structure needing opening or maintenance, marking the water inlet depth and the water inlet position of the cofferdam structure, punching a hole on the side wall of the water storage structure at the upper part of the construction side wall of the preset cofferdam structure, and putting an expansion pipe of an expansion bolt;
lifting the whole cofferdam structure by using a crane, then putting in water, continuing to put down after the anti-skid steel boots contact the bottom, and stopping putting down until the P-shaped water stop strips at the connecting frame are tightly attached to the side wall of the water storage structure and the cofferdam structure does not fall under the action of gravity, so that the crane releases the cofferdam structure;
the fourth step is reinforcement;
using expansion bolts to penetrate through the construction side wall of the cofferdam structure and extend into the expansion pipes, and screwing the expansion bolts to fix the upper part of the cofferdam structure on the side wall of the water storage structure;
starting the hydraulic cylinders of the two sets of hydraulic pressing mechanisms through a hydraulic control system, enabling extension rods of the two hydraulic cylinders to synchronously extend out, pressing a construction side wall and a P-type water stop strip of the cofferdam structure on a side wall of a water storage structure, and forming sealing at the periphery of a working opening;
the fifth step is pumping water;
the submersible pump is used for pumping and discharging water in the cofferdam structure, so that the water level in the cofferdam structure is lower than the lower end of the working opening, and at the moment, workers can perform opening or maintenance construction on the side wall of the water storage structure in the cofferdam, and construction without stopping water is realized.
7. The construction method for installing and dismantling the cofferdam without stopping water supply according to claim 6, wherein:
the processing of the enclosing side wall of the cofferdam structure comprises the following steps: processing a finished steel pipe or a steel plate into a cylinder by using a plate bending machine, dividing the finished steel pipe or the cylinder into two halves along an axis to form two enclosing side walls of the cofferdam structures, wherein the section of the enclosing side wall of each cofferdam structure is in a semicircular arch shape;
the processing of the construction side wall of the cofferdam structure comprises the following steps: sequentially welding the upper half wall, the connecting frame and the lower half wall from top to bottom in the same plane to form a construction side wall;
the bottom plate of the cofferdam structure is processed by cutting a plane steel plate into a semi-circular arch matched with the enclosing side wall of the cofferdam structure;
the hydraulic cylinder processing is to coaxially weld an extension rod made of a steel pipe on an extension rod of the hydraulic cylinder;
the processing of the anti-skid steel boots comprises the steps of firstly manufacturing a square steel plate, then welding a hinged shaft sleeve on the upper surface of the square steel plate, and welding 3-5 anti-skid steel teeth on the lower surface of the square steel plate; the size of the square steel plate is preferably 200 mm × 10 mm.
8. The construction method for installing and dismantling the cofferdam without stopping water supply according to claim 6, wherein: the method also comprises a sixth step, wherein the sixth step is cofferdam dismantling;
after the construction of the side wall of the water storage structure is completed, the hydraulic control system starts the hydraulic cylinders of the two sets of hydraulic pressing mechanisms to enable the extension rods of the two hydraulic cylinders to be synchronously retracted, and the P-shaped water stop strip does not press the side wall of the water storage structure any more so as to lose the sealing effect; and (4) removing the expansion bolts on the upper part of the cofferdam structure, and hoisting the cofferdam structure by using the crane integrally after water is injected into the cofferdam structure at the working opening part until the water surfaces inside and outside the cofferdam structure are flush, thereby completing the cofferdam removal work.
9. The construction method for installing and dismantling the cofferdam without stopping water supply according to claim 8, wherein: in the fifth step, when the staff observes that the water leakage at the working opening is serious and the water level is possibly raised to the working opening within the time required by construction, the staff opens the air valve, starts the air compressor to charge air into the cavity of the P-shaped water stop strip, so that the P-shaped water stop strip is expanded to improve the sealing degree of the working opening; and after the P-shaped water stop strip expands, the air valve and the air compressor are closed.
10. The construction method for installing and dismantling the cofferdam without stopping water supply according to claim 9, wherein: in the fifth step, if the cavity of the P-shaped water stop strip is inflated, the staff still observes that the water leakage at the working opening is serious, and when the water level possibly rises to the working opening within the time required by construction, the staff sets a small-flow submersible pump in the cofferdam structure and starts a small-flow water starting pump to continuously discharge the accumulated water in the cofferdam structure until the construction is finished; the water discharge speed of the small-flow submersible pump is matched with the water leakage speed at the working opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671847.8A CN111663548A (en) | 2020-07-14 | 2020-07-14 | Cofferdam structure for construction without water cut and construction method for mounting and dismounting cofferdam without water cut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671847.8A CN111663548A (en) | 2020-07-14 | 2020-07-14 | Cofferdam structure for construction without water cut and construction method for mounting and dismounting cofferdam without water cut |
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| CN111663548A true CN111663548A (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832147A (en) * | 2021-01-26 | 2021-05-25 | 武大巨成结构股份有限公司 | Side wall overhauling device and method for aqueduct under condition of uninterrupted water |
-
2020
- 2020-07-14 CN CN202010671847.8A patent/CN111663548A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832147A (en) * | 2021-01-26 | 2021-05-25 | 武大巨成结构股份有限公司 | Side wall overhauling device and method for aqueduct under condition of uninterrupted water |
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Inventor after: Li Dongsen Inventor after: Ma Weimin Inventor after: Song Yaowei Inventor after: Yin Haoyang Inventor after: Ma Pengxiang Inventor after: Ji Yuanke Inventor after: Zhao Sherui Inventor after: Zhang Xiaodong Inventor after: Liu Yang Inventor after: Jin Jiping Inventor after: Ma Zhihua Inventor after: Pan Lulu Inventor after: Sun Chong Inventor after: Du Ensong Inventor after: Gao Xiaotao Inventor after: Yan Meng Inventor after: Shi Yongna Inventor before: Li Dongsen Inventor before: Ma Weimin Inventor before: Song Yaowei Inventor before: Yin Haoyang Inventor before: Ma Pengxiang Inventor before: Ji Yuanke Inventor before: Zhao Sherui Inventor before: Zhang Xiaodong Inventor before: Liu Yang Inventor before: Jin Jiping Inventor before: Ma Zhihua Inventor before: Pan Lulu Inventor before: Sun Chong Inventor before: Du Ensong Inventor before: Gao Xiaotao Inventor before: Yan Meng Inventor before: Shi Yongna |