A rapid bottom clearing construction method for double-wall steel cofferdam in deep water area

Abstract

The present invention provides a method for rapid bottom cleaning of a double-wall steel cofferdam in a deep-water area, and relates to the field of building construction technology, including the preparation of materials and equipment, the assembly of a self-made slag extraction system, the use of a long-arm grab to perform preliminary bottom cleaning in the cofferdam, the use of a self-made slag extraction system to perform precise bottom cleaning in the cofferdam, and the arrangement of divers to go into the water to inspect and accept the quality of the bottom cleaning of the foundation pit. The construction method of the present invention effectively reduces the pipe blocking rate of the bottom cleaning auxiliary equipment, improves the efficiency of the bottom cleaning construction, and reduces the damage rate of the bottom cleaning equipment. Through the self-made slag extraction system, the cost of equipment rental and maintenance costs are reduced, and the slag extraction system is easy to assemble, the difficulty of component manufacturing is low, and it can be conveniently manufactured at a nearby selection plant, saving transportation costs. The method of the present invention overcomes the problems of easy pipe blocking, easy damage, and poor bottom cleaning effect of precise bottom cleaning auxiliary equipment.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a rapid bottom clearing construction method for a double-wall steel cofferdam in a deep water area. Background Art

[0002] Bottom clearing construction is one of the key processes in the construction of double-wall steel cofferdams. The quality of bottom clearing directly determines the positioning quality of the double-wall steel cofferdam after implantation. When clearing the bottom of a double-wall steel cofferdam in deepwater areas, different bottom clearing methods are adopted according to the water depth and geological conditions, involving long-arm grabbing, high-pressure water guns, self-priming mud pumps, dredging ships and other machinery. Various bottom clearing equipment has different advantages and disadvantages, especially the common self-priming mud pumps and sewage pumps on the market as auxiliary precise bottom clearing equipment, which are easy to block pipes, limited to fine aggregates, and have poor bottom cleaning effects. In addition, if the working time is long and the storage is improper, the motor is easy to burn, the impeller and turbine are easy to be damaged, and the maintenance cost is high. Summary of the invention

[0003] The present invention provides a deep water area double-wall steel cofferdam rapid bottom clearing construction method, which is used to solve the problem raised in the above background technology that the existing self-priming sludge pump and sewage pump are easy to be blocked when used as auxiliary precise bottom clearing equipment.

[0004] In order to solve the above technical problems, the present invention discloses a method for rapid bottom clearing construction of a double-wall steel cofferdam in deep water, comprising:

[0005] Step S1: Use a long-arm grab bucket to perform preliminary bottom cleaning inside the cofferdam;

[0006] Step S2: Use a self-made slag extraction system to clean the bottom of the cofferdam again.

[0007] Preferably, before step S1, the method further includes: step S01: construction preparation, including preparation of construction materials and construction equipment; step S02: assembly of a self-made slag extraction system;

[0008] The method further includes the following steps after step S2: step S3: arranging divers to go into the water to inspect and accept the quality of the bottom cleaning of the foundation pit.

[0009] Preferably, the homemade slag extraction system comprises: a slag extraction conduit and a power device, and the slag extraction conduit is connected to the power device.

[0010] Preferably, the slag extraction conduit comprises:

[0011] The vertical conduit is connected to the horizontal conduit through a conduit elbow. The slag inlet of the vertical conduit is fixedly connected with cross-arranged blocking steel bars, and the vertical conduit is connected to the power device.

[0012] Preferably, the power device includes an air compressor, the exhaust pipe output end of the air compressor is connected to a one-to-two joint, both output ends of the one-to-two joint are connected to an air hose, two air ducts are fixedly connected to the lower outer wall of the vertical duct, the air inlet ends of the two air ducts are respectively connected to the two air hoses, the air outlet ends of the air ducts are bent and inserted into the vertical duct, and the part of the air outlet ends of the air ducts that is bent and inserted into the vertical duct is parallel to the inner wall of the vertical duct, and a protective baffle is provided on the side of the air duct bend away from the vertical duct, and the protective baffle is fixedly connected to the vertical duct.

[0013] Preferably, the air outlet end of the air guide tube is flattened.

[0014] Preferably, a plurality of fixed steel bar lifting rings are welded to the outer wall of the horizontal conduit, and the slings matching the crane are connected to the fixed steel bar lifting rings. A nylon rope is tied to the fixed steel bar lifting rings at the slag outlet of the horizontal conduit, and the nylon rope is used to adjust the slag discharge direction of the horizontal conduit.

[0015] Preferably, it also includes a dredging device, which includes a dredging shell, a traction ring is fixedly connected to the upper end of the dredging shell, two groups of traveling components are symmetrically arranged on the left and right side walls of the dredging shell, and the traveling components are used to travel on the inner walls of the vertical duct and the horizontal duct, a center plate is fixedly connected to the inner wall of the dredging shell, and two groups of retractable crushing devices are symmetrically arranged on the left and right ends of the center plate.

[0016] Preferably, the retractable crushing device comprises a trigger assembly, the trigger assembly and the retractable crushing assembly, and the trigger assembly and the retractable crushing assembly are connected.

[0017] Preferably, the trigger assembly includes a track rod, which is fixedly connected to the side wall of the center plate, and a conical block is slidably mounted on the track rod in the up and down directions. A conical surface is provided on a side of the conical block away from the center plate, and the width of the lower part of the conical surface is smaller than the width of the upper part of the conical surface. A horizontal surface is provided above the conical surface. A second spring is also mounted on the track rod, and the upper end of the second spring is fixedly connected to the lower end of the conical block, and the lower end of the second spring is fixedly connected to the bottom surface of the track rod. The telescopic end of the lower end of the electric telescopic rod is connected above the conical surface, and the fixed end of the upper end of the electric telescopic rod is fixedly connected to the top surface inside the dredging shell.

[0018] Preferably, the retractable crushing assembly includes a supporting groove, which is arranged on the inner wall of the dredging shell, a limiting rod in the vertical direction is fixedly connected in the supporting groove, a moving block is mounted on the limiting rod, a spring four is mounted on the limiting rod, two ends of the spring four are respectively fixedly connected to the moving block and the bottom surface of the supporting groove, an end of the moving block close to the center plate is fixedly connected to a U-shaped plate, the openings of the U-shaped plates on the left and right sides are opposite, a moving sleeve is slidingly mounted on the upper parallel section of the U-shaped plate, a spring five is fixedly connected between the inner wall of the moving sleeve and the upper parallel section of the U-shaped plate, a crushing drill bit is arranged on the lower surface of the lower parallel section of the U-shaped plate, the crushing drill bit is driven by a second driving assembly, the second driving assembly is located in the lower parallel section of the U-shaped plate, and the dredging shell is provided with a protruding opening below the crushing drill bit.

[0019] Preferably, the traveling assembly includes a positioning plate, which is fixedly connected to the side wall of the dredging shell, and two sets of wheel train assemblies are symmetrically arranged on the positioning plate above and below, and the wheel train assembly includes a positioning groove, which is opened on the side wall of the dredging shell, and a support rod is slidably connected in the positioning groove along the left and right directions, and a spring is fixedly connected between the support rod and the positioning groove, a rotating wheel is arranged on the end of the support rod away from the dredging shell, a rotating rod is hinged on the positioning plate, and a driving wheel is arranged on the end of the rotating rod away from the positioning plate, and the driving wheel is driven by the first driving assembly, and a sliding groove is arranged on the side of the rotating rod close to the dredging shell, and the rotating wheel is slidably connected in the sliding groove.

[0020] Preferably, the retractable crushing device also includes a stabilizing component, which includes parallel rods, which are fixedly connected to the center plate, and sliding blocks are connected to the parallel rods for sliding along the left and right directions, and springs are mounted on the parallel rods, and one end of the springs is fixedly connected to an end of the sliding block close to the center plate, and the other end of the springs is fixedly connected to the center plate, and a mounting block is fixedly connected to the rear end of the sliding block, and a rotating wheel 2 is fixedly connected to the end of the mounting block close to the center plate, and the rotating wheel 2 is in contact with the conical surface, and a stabilizing rod is fixedly connected to the end of the mounting block away from the center plate, and the stabilizing rod passes through the side wall of the dredging shell, and a rubber block is provided at the end of the stabilizing rod away from the center plate.

[0021] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The construction method described in the present invention effectively reduces the cost of bottom cleaning construction and improves the efficiency of bottom cleaning construction. By preliminarily cleaning the large pieces of slag in the foundation pit, the pipe blocking rate of the bottom cleaning auxiliary equipment is reduced, the bottom cleaning efficiency is improved, and the large pieces of slag are prevented from damaging the bottom cleaning auxiliary equipment during the bottom cleaning process. The self-made slag extraction system reduces the cost of equipment rental and maintenance costs, and the slag extraction system is easy to assemble, the components are easy to manufacture, and can be conveniently manufactured at a nearby plant, saving transportation costs. The present invention overcomes the problems of easy pipe blocking, easy damage, and poor bottom cleaning effect of precise bottom cleaning auxiliary equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the process of the present invention;

[0026] Figure 2 It is a schematic diagram of the vertical duct structure;

[0027] Figure 3 It is a partial view of the bottom of the vertical conduit;

[0028] Figure 4 The overall top view of the homemade slag extraction system

[0029] Figure 5 This is a schematic diagram of the structure of the self-made slag extraction system of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the dredging device of the present invention;

[0031] Figure 7 for Figure 6 The enlarged structural diagram at A in the middle;

[0032] Figure 8 This is a schematic diagram of the dredging device structure after adding stabilizing components.

[0033] In the figure: 1, vertical duct; 2, horizontal duct; 3, duct elbow; 4, air compressor; 5, one-to-two joint; 6, gas hose; 7, air guide pipe; 8, wire rope; 9, nylon rope; 10, crane; 11, cofferdam; 12, slag area; 13, dredging shell; 14, traction ring; 15, travel assembly; 16, center plate; 17, positioning plate; 18, positioning groove; 19, support rod; 20, spring 1; 21, runner 1; 22, rotating rod; 23, driving wheel; 24, sliding groove; 25, track rod; 26, cone shaped block; 27, conical surface; 28, horizontal plane; 29, spring two; 30, electric telescopic rod; 31, parallel rod; 32, sliding block; 33, spring three; 34, mounting block; 35, rotating wheel two; 36, stabilizing rod; 37, rubber block; 38, supporting groove; 39, limiting rod; 40, spring four; 41, moving block; 42, U-shaped plate; 421, upper parallel section; 422, lower parallel section; 43, moving sleeve; 44, spring five; 45, crushing drill bit; 46, extension port; 47, blocking steel bar; 48, protective baffle. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] The present invention provides the following embodiments

[0037] Example 1

[0038] The embodiment of the present invention provides a method for rapid bottom clearing construction of a double-wall steel cofferdam in a deep water area, such as Figure 1 As shown, including:

[0039] Step S1: Use a long-arm grab bucket to perform preliminary bottom cleaning inside the cofferdam;

[0040] Step S2: Use a self-made slag extraction system to clean the bottom of the cofferdam 11 again.

[0041] Preferably, before step S1, the method further includes: step S01: construction preparation, including preparation of construction materials and construction equipment; step S02: assembly of a self-made slag extraction system;

[0042] The method further includes the following steps after step S2: step S3: arranging divers to go into the water to inspect and accept the quality of the bottom cleaning of the foundation pit.

[0043] The present invention is used for cleaning the slag dump area 12 in the cofferdam 11 .

[0044] The construction method described in the invention is suitable for underwater foundation pit sludge pumping and bottom clearing operations.

[0045] For underwater foundation pits with mud and slag, the self-made slag pumping equipment can directly pump out stone slag, pebbles and yellow mud with a diameter of less than 15cm by using the pressure of the air compressor and the large-diameter pipe. It has a wider applicability than ordinary mud and slag pumps and sewage pumps, and solves a series of problems such as only being able to pump out fine aggregates, easy pipe clogging, easy damage, high maintenance cost and poor bottom cleaning effect.

[0046] Use the on-site drilling rig guide tube as the main slag discharge guide tube, which is low in cost;

[0047] The combined bottom cleaning construction of long-arm grab and self-made slag removal equipment not only fully utilizes the applicability of the long-arm grab to solve the initial bottom cleaning, but also uses the self-made equipment to solve the problem of efficient and accurate bottom cleaning, with good bottom cleaning effect. The crawler-type long-arm grab is used to perform preliminary bottom cleaning of large pieces of slag in the foundation pit. The self-made slag extraction equipment sends the compressed air output by the air compressor into the duct through the exhaust pipe. After the compressed air enters the duct, a strong negative pressure is formed, which efficiently extracts the mud and slag to complete the precise bottom cleaning operation.

[0048] The beneficial effects of the above technical solution are:

[0049] The method of the present invention firstly uses a long-arm grab to preliminarily clean the bottom of the large pieces of slag in the foundation pit, and then the homemade slag extraction system sends the compressed air output by the air compressor 4 into the vertical conduit 1 through the air guide pipe 7. After the compressed air enters the conduit, a strong negative pressure is formed, and the mud and slag are efficiently extracted to complete the precise bottom cleaning construction, which effectively reduces the cost of the bottom cleaning construction and improves the efficiency of the bottom cleaning construction. By preliminarily cleaning the bottom of the large pieces of slag in the foundation pit, the blockage rate of the bottom cleaning auxiliary equipment is reduced, and the large pieces of slag are prevented from damaging the bottom cleaning auxiliary equipment during the bottom cleaning process.

[0050] Example 2

[0051] On the basis of Example 1, Figure 2-Figure 5 As shown, the self-made slag extraction system includes: a slag extraction conduit and a power device, and the slag extraction conduit is connected to the power device.

[0052] Preferably, the slag extraction conduit comprises:

[0053] Vertical conduit 1, vertical conduit 1 is connected to horizontal conduit 2 through conduit elbow 3, cross-set blocking steel bars 47 are fixedly connected to the slag inlet of vertical conduit 1, and vertical conduit 1 is connected to the power device. Both ends of conduit elbow 3 are connected to vertical conduit 1 and horizontal conduit 2 by bolts (select the connection method according to the conduit form), and sealed rubber pads are added. Conduits for on-site pile foundation construction are selected, and the heights of vertical conduits 1 and horizontal conduits 2 are determined according to the height of the cofferdam.

[0054] Preferably, the power device includes an air compressor 4, the exhaust pipe output end of the air compressor 4 is connected to a one-to-two joint 5, and both output ends of the one-to-two joint 5 are connected to a gas hose 6. Two air pipes 7 are fixedly connected to the outer wall of the lower part of the vertical conduit 1, and the air inlet ends of the two air pipes 7 are respectively connected to the two gas hoses 6. The air outlet end of the air pipe 7 is bent and inserted into the vertical conduit 1, and the part of the air outlet end of the air pipe 7 inserted into the vertical conduit 1 after bending is parallel to the inner wall of the vertical conduit 1. A protective baffle 48 is provided on the side of the bending part of the air pipe 7 away from the vertical conduit 1, and the protective baffle 48 is fixedly connected to the vertical conduit 1. One end of the air pipe 7 is threaded, and the other end is flattened by 1 / 2~2 / 3 of the diameter (to increase the pressure of the air outlet in the conduit), and the air pipe 7 is bent at 1.2m, so that the flattened end enters the conduit about 50~60cm and is basically parallel to the inner wall of the conduit. The galvanized steel pipe on the outside of the air duct 7 is arranged parallel to the vertical duct 1 and is welded and fixed at 3 equal distances with L50*δ5mm angle steels. The air duct 7 is also tied to the ear bars welded on the outside of the vertical duct 1 with thick iron wire.

[0055] Preferably, the air outlet end of the air guide tube 7 is flattened.

[0056] Preferably, a plurality of fixed steel bar lifting rings are welded to the outer wall of the horizontal conduit 2, and the slings matching the crane 10 are connected to the fixed steel bar lifting rings. The slings are used to adjust the center of gravity of the horizontal conduit. A nylon rope 9 is tied to the fixed steel bar lifting rings at the slag outlet of the horizontal conduit 2, and the nylon rope 9 is used to adjust the slag discharge direction of the horizontal conduit.

[0057] Compared with the water inlet pipe of the existing self-priming sludge pump, the vertical conduit 1 of the present invention has a larger diameter, is not easily blocked, is not restricted by the structure of the pump body, and is easier to maintain.

[0058] The beneficial effects of the above technical solution are:

[0059] When working, first assemble the slag extraction system, then lift the horizontal conduit 2 by the crane 10 and the wire rope 8, control the depth of the vertical conduit 1 inserted into the foundation pit, turn on the air compressor 4 when the insertion depth is appropriate, and send the compressed air output by the air compressor 4 into the air duct 7 through the exhaust pipe. After the compressed air enters the vertical conduit 1 through the air duct 7, a strong negative pressure is formed, and the mud slag is efficiently extracted, ensuring the efficiency of bottom cleaning. The operator pulls the nylon rope 9 to adjust the slag discharge direction of the horizontal conduit 2 to ensure that the mud slag is discharged to the target area, and prevent the mud slag outlet from heading toward the work area under the action of the impact. The working area poses a threat to the safety of the staff. The extracted mud and slag are sent to the slag disposal plant for treatment through well-sealed transport vehicles, ensuring that the environmental protection level of the work site meets the standards. Flattening the outlet end of the air duct 7 can effectively increase the outlet pressure of the air duct 7, enhance the suction force of the vertical duct 1, and improve the bottom cleaning effect and efficiency. Blocking steel bars 47 are set to prevent oversized gravel or debris from entering the duct, further reducing the probability of duct blockage. A protective baffle 48 is set to prevent the air duct 7 from colliding with gravel during the bottom cleaning construction process and causing damage to the air duct 7.

[0060] Example 3

[0061] On the basis of Example 2, Figure 6 As shown, it also includes a dredging device, which includes a dredging shell 13, a traction ring 14 is fixedly connected to the upper end of the dredging shell 13, two groups of traveling components 15 are symmetrically arranged on the left and right side walls of the dredging shell 13, and the traveling components 15 are used to travel on the inner walls of the vertical duct 1 and the horizontal duct 2. A center plate 16 is fixedly connected to the inner wall of the dredging shell 13, and two groups of retractable crushing devices are symmetrically arranged on the left and right ends of the center plate 16; the retractable crushing device includes a trigger component and a retractable crushing component, and the trigger component and the retractable crushing component are connected.

[0062] Preferably, the trigger assembly includes a track rod 25, which is fixedly connected to the side wall of the center plate 16. A conical block 26 is slidably mounted on the track rod 25 in the up and down directions. A conical surface 27 is provided on the side of the conical block 26 away from the center plate 16. The width of the lower part of the conical surface 27 is smaller than the width of the upper part of the conical surface 27. A horizontal surface 28 is provided above the conical surface 27. A spring 29 is also mounted on the track rod 25. The upper end of the spring 29 is fixedly connected to the lower end of the conical block 26, and the lower end of the spring 29 is fixedly connected to the bottom surface of the track rod 25. The telescopic end of the lower end of the electric telescopic rod 30 is connected above the conical surface 27, and the fixed end of the upper end of the electric telescopic rod 30 is fixedly connected to the inner top surface of the dredging shell 13.

[0063] Preferably, the retractable crushing assembly includes a support groove 38, which is arranged on the inner side wall of the dredging shell 13, and a vertical limit rod 39 is fixedly connected in the support groove 38. A moving block 41 is mounted on the limit rod 39, and a spring 40 is mounted on the limit rod 39. The two ends of the spring 40 are respectively fixedly connected to the moving block 41 and the bottom surface of the support groove 38, and one end of the moving block 41 close to the center plate 16 is fixedly connected to a U-shaped plate 42, and the U-shaped plates 42 on the left and right sides are fixedly connected to the U-shaped plates 43. 2, a movable sleeve 43 is slidably mounted on the upper parallel section 421 of the U-shaped plate 42, a spring 44 is fixedly connected between the inner wall of the movable sleeve 43 and the upper parallel section 421 of the U-shaped plate 42, a crushing drill bit 45 is arranged on the lower surface of the lower parallel section 422 of the U-shaped plate 42, and the crushing drill bit 45 is driven by the second driving assembly, and the second driving assembly is located in the lower parallel section 422 of the U-shaped plate 42, and the dredging housing 13 is provided with a protruding opening 46 below the crushing drill bit 45.

[0064] The beneficial effects of the above technical solution are:

[0065] 1. When the slag extraction system is blocked, first turn off the air compressor 4 and stop the bottom cleaning work. Then tie a traction rope to the traction ring 14 and place the dredging device into the horizontal duct 2 from the slag outlet of the horizontal duct 2. Move the traveling component 15 on the inner wall of the duct to drive the entire dredging device to move in the horizontal duct 2 or the vertical duct 1. By pulling the traction rope, the dredging device can be prevented from falling and being damaged due to insufficient friction after entering the vertical duct 1.

[0066] 2. When the dredging device moves to the blocked position, the traveling assembly 15 stops moving, the crushing drill bit 45 starts working, the electric telescopic rod 30 extends, pushing the conical block 26 to move downward, the conical surface 27 contacts the movable sleeve 43, so that the U-shaped plate 42 moves downward, and the crushing drill bit 45 extends out from the extension port 46. When the crushing drill bit 45 contacts the blocked area and the U-shaped plate 42 can no longer move downward, the conical block 26 continues to move downward and the movable sleeve 43 compresses the spring five 44 to ensure that the conical block 26 can continue to move. After the crushing drill bit 45 breaks a part of the blockage, the spring five 44 recovers part of its deformation, and the conical surface 27 contacts the movable sleeve 43, so that the U-shaped plate 42 moves downward, ensuring that the crushing drill bit 45 is always in contact with the blockage.

[0067] 3. When the blockage is broken and unblocked, the crushing drill bit 45 stops working, the electric telescopic rod 30 is retracted, the conical block 26 moves upward under the action of the spring 29, and the U-shaped plate 42 moves upward under the action of the spring 40, so that the crushing drill bit 45 is retracted into the unblocking shell 13, and finally the unblocking device is taken out from the slag outlet of the horizontal guide tube 2 by reversing the traveling component 15 and the staff pulling the traction rope, and then the air compressor 4 is turned on to continue the bottom cleaning work.

[0068] 4. When the crushing drill bit 45 is working, the spring five 44 is set to ensure that the crushing drill bit 45 is in contact with the blockage when the dredging device does not move. During the non-dredging time, the crushing drill bit 45 and the stabilizing rod 36 are retracted into the dredging shell 13 to ensure that the dredging device will not be damaged by collision during movement. At the same time, the volume of the dredging device during movement is reduced, which facilitates the movement of the dredging device in the horizontal duct 2 and the vertical duct 1. The horizontal plane 28 is set to prevent the conical block 26 from moving below the movable sleeve 43, causing a malfunction in the recovery of the dredging device.

[0069] Example 4

[0070] On the basis of Example 3, Figure 7 As shown, the traveling assembly 15 includes a positioning plate 17, which is fixedly connected to the side wall of the dredging shell 13. The positioning plate 17 is symmetrically provided with two sets of wheel train assemblies up and down. The wheel train assembly includes a positioning groove 18, which is opened on the side wall of the dredging shell 13. A support rod 19 is slidably connected in the positioning groove 18 along the left and right directions. A spring 20 is fixedly connected between the support rod 19 and the positioning groove 18. A rotating wheel 21 is provided at one end of the support rod 19 away from the dredging shell 13. A rotating rod 22 is hinged on the positioning plate 17. A driving wheel 23 is provided at one end of the rotating rod 22 away from the positioning plate 17. The driving wheel 23 is driven by the first driving assembly. A sliding groove 24 is provided on the side of the rotating rod 22 close to the dredging shell 13, and the rotating wheel 21 is slidably connected in the sliding groove 24.

[0071] The beneficial effects of the above technical solution are:

[0072] When the dredging device moves in the horizontal duct 2 and the vertical duct 1, when it encounters the inner wall of the duct narrowed due to the adhesion of mud and debris, the rotating rod 22 will rotate towards the dredging shell 13 under the action of pressure. After passing through the narrowed area, the rotating rod 22 will be pushed to rotate away from the dredging shell 13 under the action of spring 1 20, so that the driving wheel 23 is always in contact with the inner wall of the duct, ensuring that the traveling component is always in contact with the inner wall of the duct to maintain the moving state of the dredging device, and at the same time it is beneficial to improve the service life of the traveling component 15.

[0073] Example 5

[0074] On the basis of Example 3 or 4, Figure 8As shown, the retractable crushing device also includes a stabilizing component, which includes a parallel rod 31, which is fixedly connected to the center plate 16, and a sliding block 32 is slidably connected to the parallel rod 31 along the left and right directions. A spring three 33 is mounted on the parallel rod 31, and one end of the spring three 33 is fixedly connected to an end of the sliding block 32 close to the center plate 16, and the other end of the spring three 33 is fixedly connected to the center plate 16. A mounting block 34 is fixedly connected to the rear end of the sliding block 32, and a rotating wheel 2 35 is fixedly connected to the end of the mounting block 34 close to the center plate 16. The rotating wheel 2 35 contacts the conical surface 27, and a stabilizing rod 36 is fixedly connected to the end of the mounting block 34 away from the center plate 16. The stabilizing rod 36 passes through the side wall of the dredging shell 13, and a rubber block 37 is provided at the end of the stabilizing rod 36 away from the center plate 16.

[0075] The beneficial effects of the above technical solution are:

[0076] 1. When the conical block 26 moves downward, the second wheel 35 contacts the conical surface 27, causing the mounting block 34 to move away from the center plate 16, and the stabilizing rod 36 to extend from the dredging housing 13 until the rubber block 37 is in close contact with the inner wall of the conduit, thereby maintaining the stability of the dredging device in the horizontal conduit 2 or the vertical conduit 1.

[0077] 2. When the conical block 26 moves upward under the action of the second spring 29, the conical surface 27 loses its squeezing effect on the second wheel 35, and the mounting block 34 moves toward the center plate 16 under the action of the third spring 33, and the stabilizing rod 36 is retracted into the dredging housing 13.

[0078] 3. The close contact between the stabilizing rod 36 and the inner wall of the conduit ensures the stability of the dredging device in the conduit during operation, and prevents the dredging device from losing the support of the blockage and causing damage due to falling after the conduit is unblocked. The rubber block 37 is provided to increase the friction and contact area with the inner wall of the conduit, thereby ensuring the stability of the support. At the same time, the rubber block 37 can absorb part of the vibration and improve the stabilizing effect. The stabilizing component is triggered by the triggering component, which can ensure that when the crushing drill bit 45 extends out of the dredging housing 13, the stabilizing component contacts the inner wall of the conduit at the same time to support the dredging device, ensuring that the stabilizing component can play a stabilizing role when dredging begins, preventing the staff from missing an operation and causing the stabilizing component to be started incorrectly, thereby causing damage to the dredging device.

[0079] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for rapid bottom clearing construction of double-walled steel cofferdam in deep water area, characterized by: include: Step S1: Use a long-arm grab bucket to perform preliminary bottom cleaning inside the cofferdam; Step S2: Use a self-made slag extraction system to clean the bottom of the cofferdam again; The self-made slag extraction system comprises: a slag extraction conduit and a power device, wherein the slag extraction conduit is connected to the power device; The dredging device also includes a dredging shell (13), the upper end of the dredging shell (13) is fixedly connected to a traction ring (14), two groups of traveling components (15) are symmetrically arranged on the left and right side walls of the dredging shell (13), and the traveling components (15) are used to travel on the inner side walls of the vertical conduit (1) and the horizontal conduit (2), a center plate (16) is fixedly connected to the inner wall of the dredging shell (13), and two groups of retractable crushing devices are symmetrically arranged on the left and right ends of the center plate (16); the retractable crushing device includes a triggering component and a retractable crushing component, and the triggering component and the retractable crushing component are connected; The trigger assembly comprises a track rod (25), the track rod (25) being fixedly connected to the side wall of the center plate (16), a conical block (26) being slidably mounted on the track rod (25) in the up-down direction, a conical surface (27) being arranged on a side of the conical block (26) away from the center plate (16), the width of the lower part of the conical surface (27) being smaller than the width of the upper part of the conical surface (27), a horizontal surface (28) being arranged above the conical surface (27), a second spring (29) being also mounted on the track rod (25), the upper end of the second spring (29) being fixedly connected to the lower end of the conical block (26), the lower end of the second spring (29) being fixedly connected to the bottom surface of the track rod (25), the telescopic end of the lower end of the electric telescopic rod (30) being connected above the conical surface (27), the fixed end of the upper end of the electric telescopic rod (30) being fixedly connected to the inner top surface of the dredging housing (13); The retractable crushing assembly comprises a support groove (38), the support groove (38) is arranged on the inner side wall of the dredging shell (13), a vertical limit rod (39) is fixedly connected in the support groove (38), a moving block (41) is mounted on the limit rod (39), a spring four (40) is mounted on the limit rod (39), two ends of the spring four (40) are respectively fixedly connected to the moving block (41) and the bottom surface of the support groove (38), one end of the moving block (41) close to the center plate (16) is fixedly connected to a U-shaped plate (42), and the U-shaped plates (42) on the left and right sides are fixedly connected to the U-shaped plates (42) on the left and right sides. The openings are opposite to each other, a movable sleeve (43) is slidably sleeved on the upper parallel section (421) of the U-shaped plate (42), a spring (44) is fixedly connected between the inner wall of the movable sleeve (43) and the upper parallel section (421) of the U-shaped plate (42), a crushing drill bit (45) is arranged on the lower surface of the lower parallel section (422) of the U-shaped plate (42), the crushing drill bit (45) is driven by a second driving assembly, the second driving assembly is located in the lower parallel section (422) of the U-shaped plate (42), and the dredging housing (13) is provided with a protruding opening (46) below the crushing drill bit (45).

2. A method for rapid bottom clearing construction of a double-walled steel cofferdam in deep water area as claimed in claim 1, characterized in that: Before step S1, it also includes: step S01: construction preparation, including preparation of construction materials and construction equipment; step S02: assembly of a self-made slag extraction system; The method further includes the following steps after step S2: step S3: arranging divers to go into the water to inspect and accept the quality of the bottom cleaning of the foundation pit.

3. A method for rapid bottom clearing construction of a double-walled steel cofferdam in deep water area as claimed in claim 1, characterized in that: The slag extraction conduit comprises: A vertical conduit (1) is connected to the horizontal conduit (2) via a conduit elbow (3); a cross-arranged blocking steel bar (47) is fixedly connected to the slag inlet of the vertical conduit (1); and the vertical conduit (1) is connected to a power device.

4. A method for rapid bottom clearing construction of a double-walled steel cofferdam in deep water area as claimed in claim 3, characterized in that: The power device comprises an air compressor (4), the exhaust pipe output end of the air compressor (4) is connected to a one-to-two joint (5), both output ends of the one-to-two joint (5) are connected to an air delivery hose (6), two air guide pipes (7) are fixedly connected to the lower outer wall of the vertical conduit (1), the air inlet ends of the two air guide pipes (7) are respectively connected to the two air delivery hoses (6), the air outlet ends of the air guide pipes (7) are bent and inserted into the vertical conduit (1), and the part of the air outlet end of the air guide pipe (7) that is bent and inserted into the vertical conduit (1) is parallel to the inner wall of the vertical conduit (1), and a protective baffle (48) is provided on the side of the bending part of the air guide pipe (7) away from the vertical conduit (1), and the protective baffle (48) is fixedly connected to the vertical conduit (1).

5. A method for rapid bottom clearing construction of a double-walled steel cofferdam in deep water area as claimed in claim 4, characterized in that: The air outlet end of the air guide tube (7) is flattened.

6. A method for rapid bottom clearing construction of a double-walled steel cofferdam in deep water area as claimed in claim 1, characterized in that: A plurality of fixed steel bar lifting rings are welded to the outer wall of the horizontal conduit (2), and the lifting belts matched with the crane (10) are connected to the fixed steel bar lifting rings. A nylon rope (9) is tied to the fixed steel bar lifting rings at the slag discharge port of the horizontal conduit (2), and the nylon rope (9) is used to adjust the slag discharge direction of the horizontal conduit (2).

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