CN116201151B

CN116201151B - Comprehensive cofferdam system and installation and removal method

Info

Publication number: CN116201151B
Application number: CN202310497616.3A
Authority: CN
Inventors: 张乃受; 朱炜炜; 侯晋芳; 刘祥玉; 李智璞; 杜闯; 王春利; 刘开来
Original assignee: CCCC First Harbor Engineering Co Ltd
Current assignee: CCCC First Harbor Engineering Co Ltd
Priority date: 2023-05-06
Filing date: 2023-05-06
Publication date: 2023-07-14
Anticipated expiration: 2043-05-06
Also published as: CN116201151A

Abstract

The invention relates to an integrated cofferdam system and an installation and removal method, which belong to the field of cofferdams and comprise the following steps: the landing stage comprises a plurality of steel pipe piles and bridge stages, wherein the plurality of steel pipe piles are arranged at intervals and inserted into the water bottom, and the bridge stages are arranged at the tops of the steel pipe piles; the steel cofferdams are provided with two rows, the two rows of steel cofferdams are respectively arranged at two sides of the trestle, and a surrounding area between the two steel cofferdams is a construction area; filling sand is arranged in the construction area; the support frame is provided with a plurality of and horizontally is fixed in partial steel-pipe pile, and the both ends of support frame are connected with two steel cofferdams respectively. Connecting the steel cofferdams at two sides with the steel pipe piles through two ends of the supporting frame, and supporting the steel cofferdams at two sides; filling sand is filled in the construction area, and the stability of the trestle is improved by fastening the construction area through the filling sand. The collapse of the whole structure is avoided, and the construction can be normally carried out under severe weather conditions.

Description

Comprehensive cofferdam system and installation and removal method

Technical Field

The invention belongs to the technical field of cofferdams, and particularly relates to an integrated cofferdam system and an installation and removal method.

Background

The cofferdam is a temporary enclosure structure built for building a permanent hydraulic facility in hydraulic engineering construction. The water and soil are prevented from entering the building construction position, so that water is drained in the cofferdam, a foundation pit is excavated, and the building is constructed. Typically used mainly in hydraulic construction, cofferdams are typically removed after use, except as part of the main building.

In the prior art, trestle and cofferdam are usually arranged together, and construction is carried out in a cofferdam enclosing area below the trestle, and materials are transported through the trestle. However, in the prior art, the cofferdam and the trestle are separate individuals, the water area is generally poor in environment, and when the impact of strong wind and strong waves occurs, the cofferdam is easy to topple, so that serious safety accidents occur.

Disclosure of Invention

Aiming at the defects existing in the related art, the invention provides a comprehensive cofferdam system and an installation and dismantling method, wherein steel cofferdams on two sides are pulled by a supporting frame, the steel cofferdams are prevented from being poured outwards, a construction area inside the steel cofferdams is stabilized by filling sand, and water pressure is resisted by filling sand, so that the technical problem that safety accidents easily occur in the steel cofferdams in the prior art is solved.

The invention provides an integrated cofferdam system, comprising:

the trestle comprises a plurality of steel pipe piles and bridge decks, wherein the plurality of steel pipe piles are arranged at intervals and inserted into the water bottom, and the bridge decks are arranged at the tops of the steel pipe piles;

the steel cofferdams are provided with two rows, the two rows of steel cofferdams are respectively arranged at two sides of the trestle, and a surrounding area between the two steel cofferdams is a construction area; the construction area is internally provided with filling sand;

the steel pipe pile comprises a supporting frame, wherein the supporting frame is provided with a plurality of steel pipe piles, the steel pipe piles are horizontally fixed on the supporting frame, and two ends of the supporting frame are respectively connected with two steel cofferdams.

In the technical scheme, the trestle is installed and the steel cofferdams are installed, the steel cofferdams on two sides are connected with the steel pipe piles through the two ends of the supporting frame, the supporting of the steel cofferdams on two sides is achieved, the supporting frame pulls the steel cofferdams on two sides, and the steel cofferdams on two sides are prevented from being far away from each other. Filling sand is filled in the construction area, the construction area is fastened by the filling sand, and the filling sand resists water pressure so as to prevent the cofferdam from toppling under the action of the water pressure. And the filling sand can wrap the steel pipe pile, improves the stability of landing stage. The collapse of the whole structure is avoided, and the construction can be normally carried out under severe weather conditions.

In some of these embodiments, the top surface of the sand pack is level with the water surface level; the grain diameter of the gravel in the filling sand is 0.35 mm-0.5 mm.

In the technical scheme, the too small particle size of the gravel causes the waste caused by the fact that the gravel is mixed into water and washed away; and the water blocking effect is poor if the particle size is too large, so that water seepage in the cofferdam is too much. The selection of the gravel in this size range can be adapted to the requirements of the construction.

In some embodiments, the steel cofferdam is formed by a plurality of steel sheet piles which are spliced in turn, and clamping grooves are formed in two sides of each steel sheet pile and are used for being clamped with the clamping grooves of the adjacent steel sheet piles.

In the technical scheme, the connection is accomplished in the mutual joint of draw-in groove of a plurality of steel sheet piles, and the draw-in groove can seal the gap between the steel sheet pile, avoids the infiltration.

In some embodiments, a guide assembly is detachably arranged on a part of the steel pipe piles and the bridge abutment of the trestle, and the guide assembly comprises two guide rods which are parallel and extend out of the trestle; and guide grooves for sliding the steel sheet piles are formed in the side walls of the two guide rods facing each other in the guide assembly.

In the technical scheme, the steel cofferdam can be guided through the two guide rods and the opposite guide grooves when being installed, and the steel cofferdam is simple in structure and low in cost.

In some embodiments, the trestle further comprises a support beam and a plurality of bailey frames, the support beam is fixed at the top of each steel pipe pile, the plurality of bailey frames are arranged above the support beam, and the bridge abutment is arranged above each bailey frame.

In the technical scheme, the bridge abutment is supported by the bailey frame to finish the erection of the trestle, and the bailey frame has simple structure and can be purchased or customized in batches, so that the cost is saved.

The invention also provides an integrated cofferdam installation method for installing the integrated cofferdam system, which comprises the following specific steps:

construction of trestle: sequentially inserting steel pipe piles into the water bottom, and paving bridge abutment above the steel pipe piles;

and (3) supporting frame installation: horizontally fixing the support frame on part of the steel pipe piles, and connecting two ends of the support frame with the steel cofferdams on two sides respectively;

and (3) construction of a steel cofferdam: installing guide assemblies on part of the steel pipe piles and the bridge abutment, sequentially inserting steel sheet piles downwards through the guide assemblies, and sequentially connecting the steel sheet piles to form a steel cofferdam; connecting the steel sheet piles corresponding to the supporting frames with the supporting frames;

sand filling: and paving the filling sand on an abutment of the trestle, and pushing the filling sand into a construction area.

In the technical scheme, the trestle is installed and the steel cofferdams are installed, the steel cofferdams on two sides are connected with the steel pipe piles through the two ends of the supporting frame, the supporting of the steel cofferdams on two sides is achieved, the supporting frame pulls the steel cofferdams on two sides, and the steel cofferdams on two sides are prevented from being far away from each other. Filling sand is filled in the construction area, the construction area is fastened by the filling sand, and the filling sand resists water pressure so as to prevent the cofferdam from toppling under the action of the water pressure. And the filling sand can wrap the steel pipe pile, improves the stability of landing stage. The collapse of the whole structure is avoided, and the construction can be normally carried out under severe weather conditions. And the installation of the steel cofferdam can be completed rapidly through the guide assembly, so that the working efficiency is improved.

In some embodiments, in the construction of the steel cofferdam, the specific steps of installing the guide assembly on part of the steel pipe piles and the bridge abutment are as follows:

two guide rods in the guide assembly are arranged in parallel, one end of each guide rod extends out of the trestle, two guide grooves in the two guide rods are arranged oppositely, and the guide rods are connected with corresponding steel pipe piles or bridge decks; the guide assemblies connected with the bridge abutment and the guide assemblies connected with the steel pipe piles are arranged in one-to-one correspondence and at intervals up and down.

In technical scheme, when installing the steel sheet pile, put into each guide way of two sets of guide components that correspond with the steel sheet pile, be vertical state when guaranteeing the steel sheet pile decline through two sets of guide components from top to bottom to guarantee the position of steel sheet pile installation, do not need the manual work to align, improve installation effectiveness and rate of accuracy.

In some embodiments, in the construction of the steel cofferdam, steel sheet piles are sequentially inserted downwards through guide components, and the concrete steps of sequentially connecting the steel sheet piles to form the steel cofferdam are as follows:

respectively inserting two sides of the corresponding steel sheet pile into two guide grooves in the guide assembly, and vertically dropping into the steel sheet pile downwards; the clamping groove of the steel sheet pile being installed is clamped with the clamping groove of the steel sheet pile already installed.

In the technical scheme, the installation position of the steel sheet pile is ensured, manual alignment is not needed, and the installation efficiency and the accuracy are improved.

In some embodiments, the construction of the trestle comprises the following specific steps: hoisting a steel pipe pile of the trestle to a designated position by a crane, and driving the steel pipe pile into the water bottom by an electric vibrating hammer; and sequentially lifting by a crane and sequentially installing a support beam, a bailey frame and an abutment on the steel pipe pile.

The invention also provides a method for dismantling the comprehensive cofferdam, which is used for dismantling the comprehensive cofferdam system and comprises the following specific steps: pulling out the steel sheet piles which are not connected with the supporting frame, waiting for water flow to wash away filling sand in the construction area, and removing the supporting frame and the rest steel sheet piles; and hoisting and removing the bridge abutment, the bailey frame, the supporting beam and the steel pipe pile in sequence.

In the technical scheme, the filling sand in the construction area can be quickly reduced and the construction efficiency is improved by removing part of the steel sheet piles and flushing part of the filling sand by water flow.

Based on the technical scheme, in the embodiment of the invention, trestle is installed and steel cofferdams are installed, the steel cofferdams on two sides are connected with the steel pipe piles through the two ends of the supporting frame, the supporting of the steel cofferdams on two sides is achieved, and the supporting frame pulls the steel cofferdams on two sides, so that the steel cofferdams on two sides are prevented from being far away from each other. Filling sand is filled in the construction area, the construction area is fastened by the filling sand, and the filling sand resists water pressure so as to prevent the cofferdam from toppling under the action of the water pressure. And the filling sand can wrap the steel pipe pile, improves the stability of landing stage. The collapse of the whole structure is avoided, and the construction can be normally carried out under severe weather conditions. And the installation of the steel cofferdam can be completed rapidly through the guide assembly, so that the working efficiency is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a schematic view of the overall structure of an embodiment of the integrated cofferdam system of the present invention;

FIG. 2 is a schematic view of a portion of a steel sheet pile of one embodiment of the integrated cofferdam system of the present invention;

FIG. 3 is a schematic view of a guide bar portion of one embodiment of an integrated cofferdam system of the present invention;

FIG. 4 is a flow chart of the method of installing the integrated cofferdam of the present invention;

FIG. 5 is a flowchart of the construction steps of a trestle in the method for installing an integrated cofferdam of the present invention;

FIG. 6 is a flow chart of the steel cofferdam construction steps in the integrated cofferdam installation method of the present invention.

In the figure:

100. a steel pipe pile; 200. a support beam; 300. a bailey frame; 400. a bridge abutment; 500. a support frame; 600. steel sheet piles; 601. a clamping groove; 700. a guide rod; 701. a guide groove; 800. filling sand.

Detailed Description

The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In one exemplary embodiment of the integrated cofferdam system of the present invention, as illustrated in fig. 1, the integrated cofferdam system comprises: the landing stage, steel cofferdam and support frame 500, wherein, the landing stage includes a plurality of steel-pipe piles 100 and abutment 400, and a plurality of steel-pipe piles 100 interval sets up and inserts the submarine, and abutment 400 sets up in steel-pipe pile 100 top; the steel cofferdams are provided with two rows, the two rows of steel cofferdams are respectively arranged at two sides of the trestle, and a surrounding area between the two steel cofferdams is a construction area; a filling sand 800 is arranged in the construction area; the supporting frame 500 is provided with a plurality of and horizontally fixed to a part of the steel pipe piles 100, and both ends of the supporting frame 500 are respectively connected with two steel cofferdams.

The landing stage is installed and the steel cofferdam is installed, the steel cofferdams on two sides are connected with the steel pipe piles 100 through the two ends of the supporting frame 500, the supporting of the steel cofferdams on two sides is achieved, the supporting frame 500 pulls the steel cofferdams on two sides, and the steel cofferdams on two sides are prevented from being far away from each other. The construction area is filled with filling sand 800, the construction area is fastened by the filling sand 800, and the filling sand 800 resists the water pressure so as to prevent the cofferdam from being toppled under the action of the water pressure. And the filling sand 800 can cover the steel pipe pile 100, so that the stability of the trestle is improved. The collapse of the whole structure is avoided, and the construction can be normally carried out under severe weather conditions.

Specifically, the trestle is constructed by adopting a fishing method, namely, the construction is carried out from the sides of the two sides of the water area in opposite directions, and the splicing of the trestle is completed in the middle of the water area. The method greatly improves the construction efficiency.

More specifically, during construction, a plurality of pile groups are driven in sequence along the preset length direction of the trestle, and each pile group is internally provided with a plurality of steel pipe piles 100 which are arranged at intervals. Preferably, a plurality of steel pipe piles 100 in each pile group are arranged along the width direction of the trestle.

Referring to fig. 1, in an embodiment, the trestle further includes a supporting beam 200 and a plurality of bailey frames 300, the supporting beam 200 is fixed on top of each steel pipe pile 100, the plurality of bailey frames 300 are disposed above the supporting beam 200, and the bridge abutment 400 is disposed above each bailey frame 300. Bridge abutment 400 is supported by bailey frame 300, the trestle is erected, the bailey frame 300 is simple in structure, can be purchased or customized in batches, and cost is saved.

Specifically, the number of the supporting beams 200 is the same as the number of the pile groups, the supporting beams 200 are horizontally arranged and the length direction is arranged along the preset width direction of the trestle. The bottom of the support beam 200 is connected to the top of the steel pipe pile 100 in the corresponding pile group. Multiple sets of bailey frames 300 are hoisted above the support beams 200, and the bailey frames 300 are erected above two adjacent support beams 200.

Further, the top of the steel pipe pile 100 is sleeved with a pile cap, and after the supporting beam 200 is arranged at the top of the corresponding steel pipe pile 100, the pile cap is connected with the supporting beam 200 through welding, so that the stability of the structure is improved.

Specifically, a reinforcing rib is provided between the steel pipe pile 100 and the support beam 200, thereby improving the structural strength.

In one embodiment, the abutment 400 is formed by splicing a plurality of deck pattern steel plates, the deck pattern steel plates are lifted to be placed on the bailey frame 300, and the plurality of deck pattern steel plates are spliced with each other to complete the installation of the abutment 400.

In one embodiment, the edge of abutment 400 is provided with armrests by which operators are prevented from falling, improving safety.

In one embodiment, the connection between the steel cofferdam and the supporting frame 500 includes, but is not limited to, welding, bolting or screwing.

Referring to FIG. 1, in one embodiment, the top surface of the packed sand 800 is level with the water surface; the particle size of the gravel in the sand 800 is 0.35mm to 0.5mm. The too small particle size of the gravel causes the gravel to be mixed into water and washed away, thus wasting the gravel; and the water blocking effect is poor if the particle size is too large, so that water seepage in the cofferdam is too much. The selection of the gravel in this size range can be adapted to the requirements of the construction.

Further, the gravel with the grain size of 0.35 mm-0.5 mm is medium gravel, and twenty weight percent of fine gravel with the grain size of 0.1 mm-0.2 mm is further contained in the filling sand 800. Gaps between the grits in the cofferdam are filled with fine sand grains, further improving the water stopping effect, and increasing the density of the filled sand 800 to enhance the support of the cofferdam.

Referring to fig. 2 and 3, in an embodiment, the steel cofferdam is formed by a plurality of steel sheet piles 600 spliced in turn, two sides of the steel sheet piles 600 are provided with clamping grooves 601, and the clamping grooves 601 are used for clamping with the clamping grooves 601 of the adjacent steel sheet piles 600. The connection is accomplished to the joint each other of draw-in groove 601 of a plurality of steel sheet piles 600, and the draw-in groove 601 can seal the gap between the steel sheet piles 600, avoids the infiltration.

Further, the cross section of the steel sheet pile 600 is U-shaped, and the edge of the steel sheet pile 600 is provided with a clamping groove 601. When a plurality of steel sheet piles 600 are connected to form a cofferdam, the adjacent two steel sheet piles 600 are opposite in orientation, i.e., the cross section of the steel cofferdam is wavy. The edges of the steel sheet piles 600 are caught in the catching grooves 601 of the adjacent steel sheet piles 600.

Referring to fig. 2 and 3, in an embodiment, a guide assembly is detachable on a portion of the steel pipe pile 100 and the abutment 400 of the trestle, the guide assembly includes two guide rods 700, and the two guide rods 700 are parallel and extend out of the trestle; the side walls of the two guide rods 700 facing each other in the guide assembly are provided with guide grooves 701 for sliding the steel sheet pile 600. The steel cofferdam can be guided by the two guide rods 700 and the opposite guide grooves 701, so that the steel cofferdam is simple in structure and low in cost.

Further, the steel pipe piles 100 at the edge of the trestle are provided with mounting frames, and the length direction of the mounting frames is the same as the length direction of the trestle. The guide assembly arranged on the steel pipe pile 100 is connected with the installation frame, so that construction is convenient.

Specifically, the guide bar 700 may be spot welded or bolted to the corresponding abutment 400 or mounting frame, and the steel cofferdam is installed after the guide assembly is used, and the guide bar 700 may be removed to a new construction position and repeatedly connected to the abutment 400 or mounting frame. The guide assembly can be used repeatedly, so that the cost is saved. It should be noted that the manner of connection between the guide bar 700 and the abutment 400 or the mounting bracket also includes other manners of fastening, screws, rivets, etc.

Referring to fig. 4, the invention further provides a method for installing the integrated cofferdam, which is used for installing the integrated cofferdam system, and comprises the following specific steps:

s020 trestle construction: sequentially inserting the steel pipe piles 100 into the water bottom, and paving the bridge abutment 400 above the steel pipe piles 100;

s030 support 500 mounting: horizontally fixing the support frame 500 to a part of the steel pipe pile 100;

s040 steel cofferdam construction: installing guide components on part of the steel pipe piles 100 and the bridge abutment 400, sequentially inserting steel sheet piles 600 downwards through the guide components, and sequentially connecting the steel sheet piles 600 to form a steel cofferdam; connecting the steel sheet pile 600 corresponding to the support frame 500 with the support frame 500;

s050 sand filling: the filled sand 800 is laid on the bridge abutment 400 of the trestle and the filled sand 800 is pushed into the construction area.

The landing stage is installed and the steel cofferdam is installed, the steel cofferdams on two sides are connected with the steel pipe piles 100 through the two ends of the supporting frame 500, the supporting of the steel cofferdams on two sides is achieved, the supporting frame 500 pulls the steel cofferdams on two sides, and the steel cofferdams on two sides are prevented from being far away from each other. The construction area is filled with filling sand 800, the construction area is fastened by the filling sand 800, and the filling sand 800 resists the water pressure so as to prevent the cofferdam from being toppled under the action of the water pressure. And the filling sand 800 can cover the steel pipe pile 100, so that the stability of the trestle is improved. The collapse of the whole structure is avoided, and the construction can be normally carried out under severe weather conditions. And the installation of the steel cofferdam can be completed rapidly through the guide assembly, so that the working efficiency is improved.

In one embodiment, the steps before construction of the trestle in step S020 further include step S010 preparation for construction: the steel pipe pile 100, the support beam 200, the bailey frame 300, the deck pattern steel plate, the guard rail, the guide assembly, the steel sheet pile 600, and the filled sand 800 are transported to a construction site.

In the step S010 construction preparation, the method further comprises a measuring step, wherein the measuring step comprises the specific steps of calibrating the position and the direction to be constructed by using a total station, and presetting the length direction and the width direction of the trestle.

In one embodiment, the concrete steps of construction of the trestle in step S020 are as follows: hoisting the steel pipe pile 100 of the trestle to a designated position by a crane, and driving the steel pipe pile 100 into the water bottom by an electric vibrating hammer; the support beam 200, the bailey frame 300, and the abutment 400 are sequentially installed on the steel pipe pile 100 by lifting in order by a crane.

Referring to fig. 4 and 5, in the present invention, construction of trestle is performed on two sides of a water area by a fishing method, that is, construction is performed from two sides of the water area in opposite directions, and splicing of trestle is completed in the middle of the water area; and (5) carrying out construction on the single-side shoreside by utilizing the step S020 trestle. The construction of the step S020 trestle comprises the steps of S021 pile group installation, S022 supporting beam 200 installation, S023 bailey frame 300 installation and S024 bridge abutment 400 installation.

The concrete step of installing the pile group in step S021 is that the crane lifts the steel pipe pile 100 to the water surface, the steel pipe pile 100 is lowered to insert the bottom of the steel pipe pile 100 into the water bottom, and the steel pipe pile 100 is driven into the water bottom by the electric oscillating weight. And (3) hoisting another steel pipe pile 100, placing the steel pipe pile 100 on one side of the installed steel pipe pile 100 in the width direction of the preset trestle, lowering the steel pipe pile 100, inserting the bottom of the steel pipe pile 100 into the water bottom, and driving the steel pipe pile 100 into the water bottom through an electric vibrating hammer. And repeating the steps to finish the installation of the pile group. A pile cap is sleeved on the top of the steel pipe pile 100.

The specific step of installing the support beam 200 in step S022 is to hoist the support beam 200, and set the support beam 200 horizontally and in the length direction along the preset width direction of the trestle. And lowering the supporting beam 200, and welding the bottom of the supporting beam 200 with the pile caps at the tops of the steel pipe piles 100 in the corresponding pile groups to finish connection.

The step S023 of installing the bailey frames 300 is specifically that a plurality of sets of bailey frames 300 are lifted above the support beams 200, and the bailey frames 300 are erected above two adjacent support beams 200.

The specific step of installing the bridge abutment 400 in step S024 is to place the lifted deck pattern steel plates on the bailey frame 300 and splice a plurality of deck pattern steel plates with each other to complete the installation of the bridge abutment 400.

In the invention, the steps S021-S024 are the circulation of one construction period of the trestle, and the circulation of the steps S021-S024 is repeated after the step S024 is completed until the two trestles in the water area are spliced. In this cycle, the crane can be moved onto the installed bridge abutment 400 for a lifting operation in a single cycle.

In the step S030 of installing the supporting frame 500, the supporting frame 500 is horizontally fixed on a part of the steel pipe piles 100, and the specific step of connecting the two ends of the supporting frame 500 with the steel cofferdams on the two sides respectively is to hoist the supporting frame 500, and adjust the supporting frame 500 so that the length direction of the supporting frame 500 is set along the width direction of the trestle. The support frame 500 is brought close to the corresponding steel pipe pile 100, and the support frame 500 is connected to the steel pipe pile 100. The above step S030 is repeated to set the plurality of support frames 500 at intervals along the length direction of the trestle.

Further, the connection between the support frame 500 and the steel pipe pile 100 includes, but is not limited to, welding, bolting, or bolting.

In one embodiment, in the construction of the steel cofferdam in step S040, the specific steps of installing the guide assembly on a portion of the steel pipe pile 100 and the abutment 400 are as follows: two guide rods 700 in the guide assembly are arranged in parallel, one end of each guide rod extends out of the trestle, two guide grooves 701 in the two guide rods 700 are arranged oppositely, and the guide rods 700 are connected with corresponding steel pipe piles 100 or bridge decks 400; the guide assemblies connected to the bridge abutment 400 are arranged in one-to-one correspondence with the guide assemblies connected to the steel pipe piles 100 at intervals up and down. When the steel sheet pile 600 is installed, the steel sheet pile 600 is placed into each guide groove 701 of the corresponding two groups of guide assemblies, the steel sheet pile 600 is ensured to be in a vertical state when being lowered through the upper guide assembly and the lower guide assembly, the installation position of the steel sheet pile 600 is ensured, manual alignment is not needed, and the installation efficiency and the accuracy are improved.

Referring to fig. 4 and 6, in one embodiment, in the construction of the steel cofferdam in step S040, steel sheet piles 600 are sequentially inserted downward through guide members, and the specific steps of sequentially connecting the steel sheet piles 600 to form the steel cofferdam are as follows: two sides of the corresponding steel sheet pile 600 are respectively inserted into two guide grooves 701 in the guide assembly, and vertically fall down into the steel sheet pile 600; the clamping groove 601 of the steel sheet pile 600 being installed is clamped with the clamping groove 601 of the steel sheet pile 600 already installed. The installation position of the steel sheet pile 600 is ensured, manual alignment is not needed, and the installation efficiency and the accuracy are improved.

The concrete steps of the construction of the S040 steel cofferdam comprise the steps of measuring the baseline of the S041, installing the guide assembly of the S042, installing the steel sheet pile 600 of the S043 and dismantling the guide assembly of the S044. The specific step of measuring the baseline of the step S041 is to measure through a GPS-RTK, preset the length direction of the tapping cofferdam as an axis, and preset the distance between the axis and the edge of a trestle. The distance between the steel sheet piles 600 is calibrated and a baseline signature is drawn on the top surface of the trestle.

The specific step of step S042 direction subassembly installation is, lifts by crane the mounting bracket, arranges the mounting bracket in the both sides of landing stage, adjusts the direction of mounting bracket so that the length direction of mounting bracket needs the landing stage to predetermine length direction the same, fixes the mounting bracket with corresponding steel-pipe pile 100. Two of the guide rods 700 of one guide assembly are fixed to the position of the base line on the abutment 400, the other guide assembly is placed under the installed guide assembly, and the two guide rods 700 of the guide assembly are fixed to the mounting frame.

The step S043 of installing the steel sheet pile 600 is specifically to insert both sides of the steel sheet pile 600 into the corresponding guide grooves 701, respectively, and move the steel sheet pile 600 downward, and if it is the first steel sheet pile 600, directly insert into water. If it is not the first steel sheet pile 600, the clip groove 601 of the steel sheet pile 600 is inserted in cooperation with the edge of the installed steel sheet pile 600. The steel sheet pile 600 is inserted downward by an electric vibratory hammer. The top of the steel sheet pile 600 is set flush with the support beam 200. If a steel cofferdam being installed corresponds to a support frame 500, the support frame 500 is connected to the steel cofferdam.

Step S044 the specific step of removal of the guide assembly is to separate the guide assembly from the abutment 400 or the mounting bracket.

In the construction of the steel cofferdam in the step S040, the step S041-S044 is a steel cofferdam construction period, and after the step S044 is completed, the step S041-S044 is repeated until the installation of the steel cofferdam is completed.

S050 sand filling specifically comprises the following steps: the filled sand 800 is transported to the trestle by the vehicle, and the filled sand 800 is laid on the bridge abutment 400 of the trestle, and the filled sand 800 is pushed into the construction area by the forklift until the height of the filled sand 800 is the same as the water surface height.

In one embodiment, before the step of filling S050 with sand, the method further includes a step of pumping water in the construction area.

In another embodiment, after the step of filling S050 with sand, a step of pumping out water in the construction region is further included.

The invention also provides a method for dismantling the comprehensive cofferdam, which is used for dismantling the comprehensive cofferdam system and comprises the following specific steps: pulling out the steel sheet pile 600 which is not connected with the support frame 500, waiting for water flow to wash away the filling sand 800 in the construction area, and dismantling the support frame 500 and the rest of the steel sheet pile 600; the abutment 400, the bailey frame 300, the support beam 200 and the steel pipe pile 100 are sequentially lifted and removed. By removing a part of the steel sheet piles 600, the filling sand 800 in the construction area can be quickly reduced by flushing a part of the filling sand 800 with water flow, and the construction efficiency can be improved.

The step of digging the remaining filling sand 800 in the construction area with the digger is further included after waiting for the water flow to flush away the filling sand 800 in the construction area.

Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.

Claims

1. An integrated cofferdam installation method for installing an integrated cofferdam system, said integrated cofferdam system comprising: the trestle comprises a plurality of steel pipe piles and bridge decks, wherein the plurality of steel pipe piles are arranged at intervals and inserted into the water bottom, and the bridge decks are arranged at the tops of the steel pipe piles;

the support frames are provided with a plurality of steel pipe piles which are horizontally fixed on part of the steel pipe piles, and two ends of each support frame are respectively connected with two steel cofferdams;

the top surface of the filling sand is level with the water surface; the grain size of the gravel in the filling sand is 0.35 mm-0.5 mm;

the steel cofferdam is formed by a plurality of steel sheet piles which are spliced in sequence, clamping grooves are formed in two sides of each steel sheet pile, and the clamping grooves are used for being clamped with the clamping grooves of the adjacent steel sheet piles;

the steel pipe pile and the bridge abutment of the trestle are detachably provided with guide assemblies, each guide assembly comprises two guide rods, and the two guide rods are parallel and extend out of the trestle; guide grooves for sliding the steel sheet piles are formed in the side walls of the two guide rods facing each other in the guide assembly;

the trestle also comprises a supporting beam and a plurality of bailey frames, wherein the supporting beam is fixed at the top of each steel pipe pile, the plurality of bailey frames are arranged above the supporting beam, and the bridge abutment is arranged above each bailey frame;

the method for installing the comprehensive cofferdam comprises the following specific steps:

2. The method for installing an integrated cofferdam as set forth in claim 1, wherein in said steel cofferdam construction, the specific steps of installing guide assemblies on a part of said steel pipe piles and bridge abutment are as follows:

3. The method for installing an integrated cofferdam as claimed in claim 2, wherein in the construction of the steel cofferdam, steel sheet piles are sequentially inserted downwards through guide assemblies, and each steel sheet pile is sequentially connected to form the steel cofferdam, comprising the following specific steps:

4. A method of installing an integrated cofferdam as claimed in claim 3, wherein the construction of the trestle comprises the following steps: hoisting a steel pipe pile of the trestle to a designated position by a crane, and driving the steel pipe pile into the water bottom by an electric vibrating hammer; and sequentially lifting by a crane and sequentially installing a support beam, a bailey frame and an abutment on the steel pipe pile.