CN116460361A - Cutting process for underwater combined steel pipe pile - Google Patents

Abstract

The invention discloses an underwater combined steel pipe pile cutting process, which comprises the following steps of: pre-burying foundation bolts for fixing the cutting assembly on a front edge bottom plate of the dock entrance; fixing the adjacent pile bodies of the operation platform and the combined steel pipe pile to be cut by using a fastener to form an integrated structure; paving an assembly part between the combined steel pipe pile to be cut and the adjacent steel pipe pile through the foundation bolts; laying a diamond wire saw on the assembly portion along the guide assembly; when the diamond rope saw is paved, the diamond rope saw is paved in a vertical-to-horizontal direction, a fastening ring for fixing the combined steel pipe pile to be cut is formed along the horizontal direction, and the diamond rope saw faces to an operation platform through a steering assembly along two sides of the fastening ring to form a cutting path; and controlling the cutting piece to cut along the cutting surface in a mode of firstly cutting horizontally and then adjusting in the vertical direction. The invention realizes the cutting of the combined pile through the guide component and the like.

Description

Cutting process for underwater combined steel pipe pile

Technical Field

The invention belongs to the technical field of cutting of underwater combined steel pipe piles, and particularly relates to a cutting process of an underwater combined steel pipe pile.

Background

The combined steel pipe pile and the filling pile on the F axis of the front edge of the dock entrance are a fender pile system to be cut, the fender pile system adopts a steel pipe pile (phi 1219@1470 mm), the pile body bottom is constructed and embedded with a rock filling pile for anchoring, the sea side of the combined steel pipe pile is formed by a high-pressure jet grouting pile (phi 900@600 mm) and a foundation rock construction waterproof curtain which are used as a waterproof system together with the fender pile, and the cutting elevation of the fender pile is-14.0 m, so that the fender pile combined system cut by a rope saw is adopted at the elevation, and the steel pipe pile, the filling pile, the high-pressure jet grouting pile and sea mud attached to a shape body which are formed by different materials are required to be cut simultaneously.

In the prior art, piles are fixed one by diver, and underwater operation is performed by observing the piles at any time during cutting, and as the diver is a special work type, the cost is high and the safety risk is also high when the operation time is long.

Disclosure of Invention

In view of the analysis, the invention provides an underwater combined steel pipe pile cutting process, which solves the problems of long working time of divers, need of real-time attention, high construction cost and the like in the prior art.

In order to achieve the above effects, the present invention is realized by the following technical scheme.

An underwater combined steel pipe pile cutting process comprises the following steps:

pre-burying foundation bolts for fixing the cutting assembly on a front edge bottom plate of the dock entrance;

fixing the adjacent pile bodies of the operation platform and the combined steel pipe pile to be cut by using a fastener to form an integrated structure;

paving an assembly part between the combined steel pipe pile to be cut and the adjacent steel pipe pile on a guide assembly at the bottom of the operation platform through the foundation bolts;

laying a diamond wire saw on the assembly portion along the guide assembly;

when the diamond rope saw is paved, the diamond rope saw is paved in a vertical-to-horizontal direction, a fastening ring for fixing the combined steel pipe pile to be cut is formed along the horizontal direction, and the diamond rope saw faces to an operation platform through a steering assembly along two sides of the fastening ring to form a cutting path;

and controlling the cutting piece to cut along the cutting surface in a mode of firstly cutting horizontally and then adjusting in the vertical direction.

In this technical scheme, utilize diamond rope saw to form the retainer plate, when diver's during operation, only need guarantee the stable connection of bottom etc. and then the upper portion directly carries out the fixed connection of multiple combination stake for when later stage cutting, realized the effect of multiple combination stake cutting simultaneously, and then only need fix once, can a plurality of cuts.

In this technical scheme, regard adjacent steel-pipe pile as the fixed of base operation platform etc. and then in the cutting, operation platform is apart from closely, and stability is good, especially to longer steel-pipe pile cutting, need fully consider operation platform along with the going on of cutting, whole assembly stability problem, and this technical scheme has overcome above-mentioned problem.

In this technical scheme, through carrying out the fixed of integration with operation platform and adjacent steel-pipe pile, whole formation is stable supports the assembly group, has certain pinning in the direction of height, has improved stability, and the increase of guide assembly and assembly portion for the assembly of whole diamond rope saw is more firm.

As a further improvement of the invention, the fastener is utilized to fix the adjacent pile bodies of the operation platform and the combined steel pipe pile to be cut into the following concrete: and a limiting frame formed by the guide components at the bottom of the operation platform is sleeved on the adjacent steel pipe piles of the combined steel pipe piles to be cut, and fixed welding of the two is realized by utilizing an underwater welding process.

In the technical scheme, the limiting frame is formed, which is equivalent to sleeving surrounding blocks of adjacent steel pipe piles, so that the omnibearing fixing and the like are realized, and furthermore, when a diver is in water, the underwater construction operation can be realized, and compared with the prior welding of a plurality of positions, the invention only needs to weld the limiting frame, and the working time is short.

The invention further improves the assembly of the operation platform and the adjacent pile bodies, specifically, the distance between the operation platform and the pile body adjacent to the combined steel pipe pile to be cut is adjusted at the bottom of the operation platform, and the operation platform is fixed on the set height by utilizing a buckling mode.

In the invention, due to the processes of tide and the like, the whole cutting assembly is easily corroded by tide water, the construction progress is influenced, the length of the bottom supporting connecting pipe is increased by the buckle, and the operating platform is lifted to avoid contact with water.

In the technical proposal, the platform guide wheel and the bracket are fixed on the adjacent pile bodies of the combined steel pipe pile to be cut through an underwater welding process,

as a further improvement of the invention, the invention also comprises the arrangement of a cutting auxiliary line, in particular: and opening holes along the lock catch positions of the combined steel pipe piles to be cut, punching holes to the positions to be cut, and arranging cutting auxiliary lines in the punching holes from the openings to the positions to be cut.

In this technical scheme, along the hasp position trompil of composite pile to the chisel hole is to waiting to cut the position, sets up the cutting auxiliary line in the chisel hole of trompil to waiting to cut the position, ensures in the direction of height, stability in the tubular pile.

As a further improvement of the invention, the guide assembly comprises a first guide wheel and a second guide wheel positioned below the first guide wheel, wherein the first guide wheel is in the direction of the second guide wheel to form a first guide track from vertical to horizontal direction, and the second guide wheel is in the direction of the first guide wheel to form a second guide track from horizontal to vertical direction.

In this technical scheme, the direction subassembly realizes the level simultaneously to perpendicular, perhaps perpendicular to the multiple effect of level, and then can be used to many places, specifically, in this technical scheme, the direction subassembly includes the wheel body of a vertical direction to and two be located the wheel body of horizontal direction, forms the guide gap between the wheel body of horizontal direction, makes it guide to on the wheel body of vertical direction.

As a further improvement of the invention, at least two groups of guide components are respectively positioned at two sides of the steel pipe combined pile to be cut along the cutting surface.

In this technical scheme, increase two guide pulley groups, have effects such as certain centre gripping for wait to cut the composite pile both sides more stable, along with the cutting degree adjustment of diamond rope saw, diamond rope saw adjusts length and elasticity simultaneously along two guide pulley groups, and the symmetry is good, cuts steadily.

As a further improvement of the invention, when the diamond rope saw is paved, the diamond rope saw is firstly paved according to the direction along the second guide track of the guide assembly to be vertically paved from the operation platform, and then is paved according to the direction along the second guide track of the guide assembly to be horizontally paved after passing through the assembly part.

In the technical scheme, the cutting track on the operation platform is arranged horizontally to vertically, then horizontally, two levels are arranged to form a cutting height, then the height is stably ensured in the vertical direction, the efficiency is better, and meanwhile, one guide assembly realizes different guide paths, so that the cost is low.

As a further improvement of the invention, the number of the assembly parts is several, and the diamond wire saw is coated on the guide component in a staggered arrangement along the assembly parts along the height direction.

In this technical scheme, fully considered the stability of direction of height, and the setting of dislocation for the diamond rope saw must form winding structure, especially the dislocation of S type, and then twine on adjacent steel-pipe pile, perhaps twine on guide assembly, promoted whole stability.

As a further improvement of the present invention, a height difference between adjacent fitting portions in the height direction is 4m or less.

In this technical scheme, in order to fully consider stability, and then the difference in height of assembly portion is not less than 4m, will take place to turn to in 4m promptly for diamond rope saw has certain winding in the horizontal direction, and when diamond rope saw atress, can not be by the deflection to other positions, causes the security risk.

As a further improvement of the invention, the combined steel pipe pile to be cut comprises a steel pipe pile, a rock-socketed cast-in-place pile in the steel pipe pile, a cast-in-place pile with the sea side clung to the steel pipe pile and a high-pressure jet grouting pile, wherein the steel pipe pile, the cast-in-place pile and the high-pressure jet grouting pile form a triangular interface, and the high-pressure jet grouting pile is cut according to the sequence of the steel pipe pile and/or the cast-in-place pile.

In the technical scheme, the diamond rope saw is stressed strongly among the steel pipe piles, so that the outermost high-pressure jet grouting pile can be cut firstly, and then along with the adjustment in the horizontal direction, when the cast-in-place pile is cut to a certain degree, the steel pipe piles are cut simultaneously; further, with the adjustment of the position of the composite pile and the like, there may be simultaneous cutting or cutting without distinguishing the order.

Drawings

Fig. 1 is a flow chart of an underwater combined steel pipe pile cutting process provided by the invention;

fig. 2 is a flow chart of the underwater combined steel pipe pile cutting process provided by the invention in application.

Detailed Description

The construction and operation of the present invention will be described in further detail with reference to the accompanying drawings.

In order to make the purpose and technical scheme of the invention clearer and easier to understand. The present invention will now be described in further detail with reference to the drawings and examples, which are given for the purpose of illustration only and are not intended to limit the invention thereto.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in 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. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. 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 mechanically or electrically connected; 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.

The cutting process of the underwater combined steel pipe pile in the embodiment comprises the following specific steps:

an underwater combined steel pipe pile cutting process comprises the following steps:

pre-burying foundation bolts for fixing the cutting assembly on a front edge bottom plate of the dock entrance;

fixing the adjacent pile bodies of the operation platform and the combined steel pipe pile to be cut by using a fastener to form an integrated structure;

paving an assembly part between the combined steel pipe pile to be cut and the adjacent steel pipe pile on a guide assembly at the bottom of the operation platform through the foundation bolts;

laying a diamond wire saw on the assembly portion along the guide assembly;

when the diamond rope saw is paved, the diamond rope saw is paved in a vertical-to-horizontal direction, a fastening ring for fixing the combined steel pipe pile to be cut is formed along the horizontal direction, and the diamond rope saw faces to an operation platform through a steering assembly along two sides of the fastening ring to form a cutting path;

and controlling the cutting piece to cut along the cutting surface in a mode of firstly cutting horizontally and then adjusting in the vertical direction.

According to the invention, the foundation bolts are pre-buried on the front edge bottom plate of the dock entrance according to cutting arrangement before water is discharged.

In order to realize cutting more stably, the operation platform and the adjacent pile body of the combined steel pipe pile to be cut are fixed by using a fastener: and a limiting frame formed by the guide components at the bottom of the operation platform is sleeved on the adjacent steel pipe piles of the combined steel pipe piles to be cut, and fixed welding of the two is realized by utilizing an underwater welding process. Compared with simple welding, the limiting frame directly realizes fixed sleeving, and the connection relationship is more stable.

In order to reduce underwater operation of divers, the steel pipe pile to be cut is a combined pile, the distance between the operation platform and a pile body adjacent to the combined steel pipe pile to be cut is adjusted at the bottom of the operation platform, and the operation platform is fixed on a set height in a buckling mode.

And opening holes along the locking positions of the combined piles, punching holes to the positions to be cut, and arranging cutting auxiliary lines in the punching holes from the openings to the positions to be cut.

When in horizontal cutting, the cutting piece is a diamond rope saw, the diamond rope saw is arranged along a horizontal plane, and the diamond rope saw connects the assembly parts formed by the adjacent guide wheels to form a closed cavity.

Because pile body and cutting assembly distance are far away, in order to guarantee the stability of vertical direction, along the direction of height of waiting to cut the steel-pipe pile, the leading wheel interval must be greater than 4m. In the embodiment, in the vertical direction, the guide wheel interval distance is set between 4m and 5m and is not easy to be excessively large, so that the smoothness of cutting of the rope saw is ensured.

In order to realize reversing, the reversing assembly comprises a vertical pulley and two pulleys which are horizontally arranged, the central axes of the vertical pulley and the vertical direction guide wheel of the steering wheel are required to be in the same section (namely, Y section), and on the premise of ensuring the direction change, the left and right adjustment can be carried out in the X section direction according to the requirement, so that the rope saw is S-shaped on the vertical plane, and the swing amplitude of the rope saw is reduced; the centers of the two pulleys which are horizontally arranged are in a straight line with the center of the vertical pulley, the distance between the two pulleys is not larger than the diameter of the diamond rope saw, and the two pulleys cannot be contacted with each other, so that the cutting effect is prevented from being influenced by resistance.

When the cutting process is applied to the dismantling construction of the combined steel pipe piles in the dock, the cutting process comprises the following steps:

engineering introduction

Because the dock is built in an old shipyard, the dock can only be excavated after the retaining structure is adopted for retaining and the large slope type excavation cannot be adopted for the dock construction due to the influences of peripheral pouring objects, original underground pipelines and the like. The sea side of a dock entrance deep foundation pit adopts a combined steel pipe pile (phi 1219@1470 mm), the bottom of the pile body is constructed and embedded with a cast-in-place pile for anchoring, the two sides and the shore side of the foundation pit adopt drilling and embedded with a cast-in-place pile (phi 1200mm@1400 mm) as a guard pile, and the rear side of the guard pile is formed by a high-pressure jet grouting pile (phi 900@600 mm) and a foundation construction water-stop curtain which are used as a water-stop system together with the guard pile.

And when cutting is performed, analysis is performed, the to-be-disassembled combined maintenance device is positioned at a dock entrance, a water pump room and a north wing wall are arranged on the left side of the dock entrance, and a south wing wall is arranged on the right side of the dock entrance.

The main construction flow, referring to fig. 2, specifically comprises the following steps:

the structure of the front edge bottom plate of the dock entrance is completed, line cutting equipment is pre-embedded and fixed in the front edge bottom plate, and line cutting holes are formed in the lock catch positions of the combined steel pipe piles.

And (5) finishing the dock structure and dismantling the revetment.

And (3) discharging water from the dock, and dredging the sea side of the combined steel pipe pile to the designed sea bed elevation.

And the cutting equipment is installed in place, and the combined steel pipe pile and the cast-in-place pile are cut horizontally in sections.

In this embodiment, the preparation work before the construction of the cutting process is as follows:

and after the front bottom plate of the dock entrance is completed, starting preparation work for dismantling the combined steel pipe pile. Comprising the following steps: foundation bolts for fixing line cutting equipment are pre-buried on a bottom plate at the front edge of a dock entrance, steel bars are placed in the line cutting holes by drilling at the cutting elevation on the locking notch of the combined steel pipe pile so as to conveniently penetrate through cutting lines, clear fillers such as soil in the steel pipe pile and the like, and a line cutting operation platform is arranged at the top of the combined steel pipe pile.

Before water is discharged, foundation bolts of guide wheels are installed on a dock chamber bottom plate in advance according to cutting arrangement by an underwater cutting professional unit, so that underwater workload is reduced, and construction progress is accelerated.

During civil engineering construction, in order to prevent personnel, equipment from falling into the steel-pipe pile, use clay to backfill, combine the fuzzy diver sight, lift by crane in-process to fall and cause unexpected accident and increase composite pile weight in order to prevent to cut when lifting by crane with the sea water, use the water flushing method to clear up the earth in the composite pile before demolishing.

The difficulty of installing line cutting equipment underwater is increased because the sea side of the combined pile is subjected to jet grouting seepage prevention. Before water is discharged, holes are formed in the locking position of the combined pile along the cutting elevation, and the holes are drilled out of the range of the jet grouting pile body, and a reinforcing steel bar is penetrated to assist threading cutting lines. The underwater operation of divers is reduced as much as possible, and the efficacy is improved.

Cutting of combined steel pipe pile

After the sea side of the combined steel pipe pile is cleaned to the designed elevation by the dredging ship, installing a line cutting operation platform on the adjacent piles of the combined steel pipe pile to be cut, diving by groups, installing line cutting steering pulleys, installing cutting lines in place by utilizing pre-buried line cutting perforated steel bars, starting horizontal cutting of the combined steel pipe pile at the designed elevation position, and cutting the combined steel pipe pile according to 1 combined steel pipe pile, 1 rock-embedded filling pile, a filling pile clung to the outer side of the steel pipe pile and a high-pressure jet grouting pile into 1 group of combined pile bodies, wherein after the annular cutting is completed, locking openings are vertically cut along the two sides of the unit body to be removed until the unit body to be removed is completely separated from the peripheral structure. When the combined pile is vertically cut, the crane ship is in place to suspend the steel pipe combined pile unit body with the dismantling, so that the diver and operators are prevented from being injured by suddenly falling down.

The diver dives in groups, installs a wire cutting steering pulley (namely a steering assembly), installs the cutting wire in place by utilizing the pre-buried wire cutting perforated steel bar, and starts the horizontal cutting of the combined steel pipe pile at the designed elevation position. As the cutting process is carried out, the rope saw can be gradually shortened, and the operator of the equipment continuously pays attention to the tightness degree of the rope saw during cutting, so that the rope saw is prevented from being blocked due to too large fluctuation caused by too loose rope saw.

After the circumferential cutting is completed, the locking openings are vertically cut along the two sides of the unit body to be removed until the unit body to be removed is completely separated from the peripheral structure.

The construction key points in the invention are as follows:

the cutting reversing device is installed underwater, the embedded bolts of the cutting reversing device are required to be installed accurately before water prevention, the positioning, punching and embedding are required, and the fixation of the bolts is required to be ensured firmly.

The perforation of the cutting line is carried out before water is discharged, the steel bar is used as a lead to be placed at an underwater easily-accessible position, and the cutting perforation range is from the shore side to the steel pipe pile intercommunication lock catch and the outside high-pressure rotary spraying body which pass through the sea side.

Before vertical cutting between each hoisting unit, the weight is ensured to be within the hoisting capacity of the crane ship.

The invention relates to an underwater combined steel pipe pile cutting process, which mainly comprises the following steps: the method comprises the steps of underwater preparation work, installation of a working platform connecting sleeve, installation of a platform guide frame (i.e. a guide assembly), installation of a rope saw vertical guide wheel (i.e. an assembly part), installation of a rope saw steering wheel (vertical rotation level, i.e. a steering assembly), installation of a diamond rope saw, underwater welding and reinforcing of the guide frame, equipment debugging and cutting start.

In the invention, the cutting assembly and the like are arranged on the operation platform, the operation platform is assembled by firstly assembling the conventional assembly and the vertical guide wheel on the shore and then installing the assembly on the combined steel pipe pile for fixing, and then the steering wheel is adjusted underwater and welded and fixed according to the cutting angle, so that the assembly of the operation platform can be completed.

The cutting operation of the invention is limited mainly by the characteristics of a combined pile body, and the combined pile body comprises a cast-in-situ pile which is embedded in a combined steel pipe pile, a cast-in-situ pile which is closely attached to the steel pipe pile by sea survey and a high-pressure jet grouting pile which is attached to the pile body, wherein a plurality of piles are closely attached to each other, so that independent cutting cannot be performed.

According to the invention, the steel pipe pile is integrated by utilizing the intercommunicating lock catch of the combined steel pipe pile, and meanwhile, the operation platform and the adjacent steel pipe pile of the pile body to be cut are integrated by a conventional underwater welding process, so that the phenomenon of cutting and clamping of the rope saw caused by shaking of the platform during cutting is prevented.

In the invention, in the cutting process, the method further comprises the following steps:

1) Because the cutting elevation and the height difference of the cutting equipment are large, the length of the rope saw under water reaches 40-50 m, and in the cutting process, the rope saw can swing greatly under the influence of sea water fluctuation and the length of the rope saw, and the vertical guide wheel interval distance is set between 4m-5m and is not easy to be too large so as to reduce the swing amplitude, thereby ensuring the smoothness of the cutting of the rope saw.

In the invention, the vertical guide wheels form an assembly part, the cut diamond wire saw is led to the sea bed cutting elevation along the vertical direction, and the wire saw is converted into the horizontal direction through the steering assembly formed by the steering wheels. After wrapping the combined pile body to be cut, the diamond rope saw converts the rope saw in the horizontal direction into the vertical direction by using a steering assembly formed by steering wheels again, and the sea level is led out through the vertical guiding wheels to be connected to equipment. According to the cutting process, the combined steel pipe pile, the cast-in-situ pile and the high-pressure jet grouting pile are cut simultaneously, so that the cutting efficiency is greatly improved.

2) In order to avoid the error cutting of the guide wheel or the steering wheel during the cutting of the diamond wire saw, the central lines of the vertical guide wheel and the steering wheel are required to be arranged on the same section (Y section) according to the trend of the diamond wire saw. Meanwhile, in order to improve the bonding force between the diamond rope saw and the vertical guide wheel, the installation center of the vertical guide wheel can be adjusted left and right in the X section direction according to the requirement under the premise of ensuring the Y section, the rope saw is arranged in an S shape under the action of the vertical assembly part, and the swing amplitude of the rope saw is reduced so as to ensure the integrity of the guide wheel and the steering wheel.

In the steering assembly, the centers of the two pulleys which are horizontally arranged and the center of the vertical pulley are on the same straight line, the distance between the two pulleys is not larger than the diameter of the diamond rope saw, and the two pulleys cannot be contacted with each other, so that the cutting effect is prevented from being influenced by resistance.

3) In order to control the cutting elevation, a diver manually chisels a groove with the length of 10cm-20cm and the depth of 3cm-5cm at the contact position of the diamond rope saw and the pile body to be cut, so that the rope saw can be prevented from swinging up and down due to insufficient friction force of a contact surface when equipment starts to cut, and the cutting elevation is not in accordance with the requirement.

4) After the installation of the wire cutting platform and the rope saw is completed, a diver can weld and strengthen the steering wheel and the platform guide frame, so that the rope saw is prevented from being blocked due to shaking of the platform during cutting.

5) In the running process of the cutting equipment, the required length of the underwater rope saw can be gradually reduced, an operator needs to pay attention to the tightening state of the rope saw at any time, and the phenomenon of clamping caused by too loose of the rope saw and falling of the pulley groove or too tight of the rope saw is prevented.

6) The designed cutting elevation is required to be higher than the sea bed elevation by more than 0.5m, so that on one hand, the underwater operation space is provided for divers, and the working efficiency is improved; on the other hand, if the sea bed elevation is close to the cutting elevation, when the rope saw is in cutting operation, seawater can flow rapidly along with the high-speed operation of the rope saw, and sand and stone on the sea bed can enter the cutting seam to influence the smoothness of cutting.

The cutting process can simultaneously complete the cutting of 1 steel pipe pile, 1 cast-in-situ pile and adjacent high-pressure jet grouting piles within 2.5 days, and greatly improves the construction efficiency. In addition, compared with other traditional processes, the technology greatly reduces the safety risk, and the cutting process is not influenced by factors such as constructed materials, shapes, seawater and the like, so that the engineering construction cost is reduced, the purpose of reducing cost and enhancing efficiency is achieved, decision thinking and reference significance are provided for dismantling similar engineering or underwater complex environments, and the technology has popularization effect.

In the invention, the underwater combined steel pipe pile rope saw cutting system is selected to be used for cutting and consists of a wire cutting platform, a diamond rope saw, rope saw cutting equipment and other auxiliary tools. The wire cutting platform comprises an operator working platform (comprising a safety guardrail), a platform connecting sleeve, a platform guide frame, a rope saw vertical guide wheel and a rope saw steering wheel (vertical rotation level).

The connecting sleeve of the linear cutting operation platform is used for placing the platform into the adjacent steel pipe piles of the piles to be cut, the elevation of the operation platform is required to be higher than the highest tide level, and the equipment is prevented from being influenced by the tide rising of the sea water. The diver pulls the diamond rope saw to the cutting elevation through installing the vertical leading wheel at the platform leading truck, and the rethread leading wheel is twined after the rope saw changes the horizontal direction from vertical direction into the pile body of waiting to cut, is connected with cutting equipment and accomplishes the debugging, and the operator can begin to carry out safe cutting on the platform after the diver leaves the construction waters.

After the combined steel pipe pile, the cast-in-situ pile and the high-pressure jet grouting pile to be dismantled are cut, a diver removes the rope saw and the auxiliary support for fixing the guide wheel, and after the whole operation platform is transferred to a subsequent construction position by using the crane ship, the combined steel pipe pile and the cast-in-situ pile after being cut are lifted out.

The invention has the following advantages:

1) The safety risk is low: the underwater work of the underwater combined steel pipe pile rope saw cutting system is finished by a diver according to the conventional underwater operation requirement, and the diver does not need to monitor and operate underwater at the beginning and ending stages of equipment operation. In addition, the operation platform is arranged in the steel pipe pile adjacent to the pile body to be cut, the cutting termination position is at the lock catch of the combined steel pipe pile, the pile body of the platform cannot be cut, and the safety of operators is guaranteed.

2) And (3) configuration optimization of special operators: the underwater operation of divers comprises the steps of installing a working platform, installing a rope saw, debugging equipment and welding and reinforcing a guide frame and a guide wheel. The diving workload is reduced, and the working difficulty is reduced. When the rope saw cuts normally, divers can be arranged to finish other works according to requirements and international diving standards, and configuration of divers is reasonably optimized.

3) The cutting efficiency is high: because of the particularities of pile body structure and pile position design, a rope saw cannot be used for independently cutting the cast-in-place pile and the steel pipe pile, and if the cast-in-place pile, the high-pressure jet grouting pile and the underwater steel pipe pile are manually chiseled, a large number of divers are required for completing the cutting. In contrast, the combined steel pipe pile and the cast-in-place pile can be cut simultaneously under water by applying the technology, the cutting effect reaches the effect of 1+1+1 < 3, and the construction period is greatly saved.

The beneficial effects of the invention are as follows:

according to the invention, the underwater installation cutting reversing device is arranged, the embedded bolts of the cutting reversing device are required to be accurately installed before the waterproof dock is put into water, the positioning, punching and embedding are required, and the firm fixation of the bolts is required to be ensured.

According to the invention, the difficulty in underwater installation of wire cutting equipment is reduced. Before water is discharged, holes are formed in the locking position of the combined steel pipe pile along the cutting elevation, and the holes are drilled out of the range of the jet grouting pile body, and then one reinforcing steel bar is penetrated to assist threading cutting lines. The underwater operation of divers is reduced as much as possible, and the efficacy is improved.

The above examples are provided for illustrating the technical aspects of the present invention and are not limited thereto, and although the present invention has been described in detail with reference to the above examples, one skilled in the art may make modifications and equivalents to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, any modifications and equivalents thereof are within the scope of the appended claims.

Claims (10)

1. The underwater combined steel pipe pile cutting process is characterized by comprising the following steps of:

pre-burying foundation bolts for fixing the cutting assembly on a front edge bottom plate of the dock entrance;

fixing the operation platform and adjacent steel pipe piles of the combined steel pipe piles to be cut by using fasteners to form an integrated structure;

paving an assembly part between the combined steel pipe pile to be cut and the adjacent steel pipe pile on a guide assembly at the bottom of the operation platform through the foundation bolts;

laying a diamond wire saw on the assembly portion along the guide assembly;

when the diamond rope saw is paved, the diamond rope saw is paved in a vertical-to-horizontal direction, a fastening ring for fixing the combined steel pipe pile to be cut is formed along the horizontal direction, and the diamond rope saw faces to an operation platform through a steering assembly along two sides of the fastening ring to form a cutting path;

and controlling the cutting piece to cut along the cutting surface in a mode of firstly cutting horizontally and then adjusting in the vertical direction.

2. The process for cutting the underwater combined steel pipe pile according to claim 1, wherein the fixing of the operation platform and the adjacent pile body of the combined steel pipe pile to be cut by using the fastener is specifically: and a limiting frame formed by the guide components at the bottom of the operation platform is sleeved on the adjacent steel pipe piles of the combined steel pipe piles to be cut, and fixed welding of the two is realized by utilizing an underwater welding process.

3. The process for cutting the underwater combined steel pipe pile according to claim 2, further comprising the steps of assembling the operation platform and the adjacent pile body, specifically, adjusting the distance between the operation platform and the adjacent steel pipe pile of the combined steel pipe pile to be cut at the bottom of the operation platform, and fixing the operation platform at a set height by means of a fastening manner.

4. The underwater combined steel pipe pile cutting process according to claim 1, further comprising the arrangement of a cutting auxiliary line, specifically: and opening holes along the lock catch positions of the combined steel pipe piles to be cut, punching holes to the positions to be cut, and arranging cutting auxiliary lines in the punching holes from the openings to the positions to be cut.

5. The process for cutting the underwater combined steel pipe pile according to claim 1, wherein the guide assembly comprises a first guide wheel and a second guide wheel positioned below the first guide wheel, wherein the first guide wheel is positioned in the direction from the second guide wheel to form a first guide track from the vertical direction to the horizontal direction, and the second guide wheel is positioned in the direction from the first guide wheel to form a second guide track from the horizontal direction to the vertical direction.

6. The process for cutting the underwater combined steel pipe pile according to claim 1, wherein at least two groups of the guide assemblies are respectively positioned on two sides of the combined steel pipe pile to be cut along the cutting surface.

7. The process according to claim 4, wherein when the diamond wire saw is laid, the diamond wire saw is laid from the operation platform, the diamond wire saw is firstly laid in the direction along the second guiding track of the guiding assembly to the vertical direction, and then laid in the direction along the second guiding track of the guiding assembly to the horizontal direction after passing through the assembling portion.

8. The process for cutting the underwater combined steel pipe pile according to claim 1, wherein the number of the assembly parts is several, and the diamond wire saw is coated on the guide assembly in a staggered arrangement along the assembly parts along the height direction.

9. The process for cutting an underwater combined steel pipe pile according to claim 8, wherein a height difference between adjacent fitting portions in a height direction is 4m or less.

10. The process for cutting the underwater combined steel pipe pile according to claim 1, wherein the combined steel pipe pile to be cut comprises a steel pipe pile, a rock-embedded cast-in-place pile in the steel pipe pile, a cast-in-place pile with a sea side clung to the steel pipe pile and a high-pressure jet grouting pile, the steel pipe pile, the cast-in-place pile and the high-pressure jet grouting pile form a triangular interface, and the cutting is performed according to the sequence of the high-pressure jet grouting pile and the steel pipe pile and/or the cast-in-place pile.