Active control type assembled mechanized caisson system

Abstract

The application discloses an active control type fabricated mechanized open caisson system, which comprises a propelling suspension device (1), a pipeline reel device (2), a floating platform (3), an underwater excavating device (4), a fabricated open caisson main body (5), a grouting device (6), a control device (7), a slurry device (8) and a visual interface (9). The application can solve the problems of difficult ground subsidence control, difficult open caisson posture control, low mechanization and automation degree and low construction efficiency in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to a caisson construction equipment, in particular to an active control type assembled mechanical caisson system. BACKGROUND

[0002] The traditional process of deep vertical shaft construction includes traditional open cut method and traditional caisson construction. The traditional caisson construction realizes sinking by excavating the soil under the blade foot and relying on the self weight of the structure. The measures for reducing the resistance of the shaft wall include processing the side wall smooth, coating heavy oil, coating paraffin, coating clay slurry, etc. The traditional caisson is prone to problems such as sudden sinking of the structure, uneven sinking, tilting, and large settlement deformation of the ground. In recent years, some new processes and methods have emerged to improve the traditional caisson process, mainly including the press-in caisson method, the pneumatic caisson method, and the VSM (sinking vertical shaft tunneling machine) construction process.

[0003] The press-in caisson method is mainly used for press-in sinking by controlling the excavation amount of the soil under the blade foot and then using auxiliary sinking measures. The structure is cast in sections and sunk multiple times, which can be divided into drainage excavation and non-drainage excavation modes. The measures such as sand filling method, water jet method, mud sleeve method, and air curtain method are used to realize resistance reduction and deviation correction. In addition, measures such as through center jacks and counterforce piles are used to realize active control of press-in sinking. By ensuring soil left in the pit, the peripheral settlement deformation can be reduced.

[0004] The pneumatic caisson method is to construct a bottom plate in advance at the lower part of the caisson, form a high-airtight reinforced concrete structure working chamber at the lower part of the caisson, inject compressed air into the working chamber which is equal to the underground water pressure at the blade edge, so that the soil is taken out and drained in a water-free environment. The caisson is sunk to the specified depth under the action of its own weight and the upper load, and then the bottom sealing construction is carried out.

[0005] The VSM (sinking vertical shaft tunneling machine) adopts prefabricated internal structure pipe sections, uses a telescopic milling and digging arm for mechanical cutting, and uses a soil and liquid separation device to discharge the soil residue to the ground. The ground is provided with a mud-water separation device, and the hoisting and sinking of the pipe section are controlled by the ground power device. During the excavation and sinking, the milling and digging head cuts the soil at the bottom of the vertical shaft underwater. After the soil under the blade foot is excavated, the shaft body is in a suspended state, and the soil under the blade foot is stabilized by the mud wall. Then, the steel wire rope is released by the sinking device to complete the sinking of the shaft body.

[0006] The existing caisson construction method has the following problems:

[0007] 1. Although the existing technology uses non-drainage sinking, it can avoid the settlement caused by water and soil loss to some extent, but it cannot avoid the settlement caused by the gap between the pipe section and the soil which cannot be filled in time due to uncontrolled conditions such as sudden sinking of the pipe section during the sinking process, or the settlement caused by the excavation of the peripheral soil due to over-excavation of the excavation surface (the excavation diameter is larger than the blade foot diameter).

[0008] 2. Due to the different resistance distribution at different locations at the bottom of the well and at different depths of the well wall, the existing caisson technology has difficulty controlling the levelness of the top surface and the ground during each sinking, which can easily lead to the overall tilting of the caisson, making it difficult to control the caisson's attitude and affecting the quality and efficiency of caisson construction.

[0009] 3. Existing technologies have low levels of mechanization and automation, resulting in low overall construction efficiency.

[0010] Therefore, there is a need to provide an active control type prefabricated mechanized caisson system to solve the problems of difficulty in controlling ground settlement, difficulty in controlling caisson attitude, low degree of mechanization and automation, and low construction efficiency in the existing technology. Summary of the Invention

[0011] The purpose of this invention is to provide an active control type prefabricated mechanized caisson system that can solve the problems of difficulty in controlling ground settlement, difficulty in controlling caisson attitude, low degree of mechanization and automation, and low construction efficiency in the existing technology.

[0012] This invention is implemented as follows:

[0013] An actively controlled prefabricated mechanized caisson system includes a propulsion suspension device, a pipeline reel device, a floating platform, an underwater excavation device, a prefabricated caisson body, a grouting device, a control device, a slurry device, and a visualization interface. Several propulsion suspension devices are spaced apart on the ground around the caisson body, and the prefabricated caisson body is suspended or lowered into the caisson body via these devices. The floating platform floats on the water surface inside the prefabricated caisson body, and a hollow structure is formed in the middle of the floating platform, allowing the underwater excavation device to be suspended below the floating platform and positioned within the prefabricated caisson. At the bottom of the main body, the pipeline of the underwater excavation device passes through the hollow structure, penetrates the floating platform, and leads out of the prefabricated caisson body before winding around the pipeline reel device, which is set on the ground next to the caisson body. The grouting device and the slurry device are both set on the ground outside the caisson body. The grouting device injects grout between the caisson wall and the outer wall of the prefabricated caisson body, and the slurry device is connected to the underwater excavation device. The control device is electrically connected to the propulsion suspension device, the pipeline reel device, the floating platform, the underwater excavation device, the prefabricated caisson body, the grouting device, the slurry device, and the visualization interface.

[0014] The control device comprises a power distribution cabinet, a central control room, a grouting slurry controller, a pressure lifting swing hydraulic controller, an underwater excavation hydraulic controller and a pipe reel hydraulic controller which are electrically connected with the power distribution cabinet; the central control room is connected with the grouting slurry controller, the pressure lifting swing hydraulic controller, the underwater excavation hydraulic controller and the pipe reel hydraulic controller; the grouting slurry controller is electrically connected with a grouting device and a slurry device; the pressure lifting swing hydraulic controller is electrically connected with a propulsion suspension device; the underwater excavation hydraulic controller is electrically connected with an underwater excavation device; the pipe reel hydraulic controller is electrically connected with a pipe reel device; and a visual interface is installed on the central control room.

[0015] The pipe reel device comprises a reel base, a multi-pipe reel, a slurry pipe reel, a lifting jib, a jib oil cylinder, a pipe fairlead and a reel drive; the reel base is fixedly installed on the ground beside the shaft body; one end of the lifting jib is rotatably connected to the reel base, and the other end of the lifting jib extends above the shaft body; the jib oil cylinder is telescopically connected between the lifting jib and the reel base; the pipe fairlead is arranged at the other end of the lifting jib; the multi-pipe reel and the slurry pipe reel are rotatably installed on the reel base by the reel drive; the multi-pipe reel and the slurry pipe reel are rotatably installed on the reel base by the reel drive; the multi-pipe of the underwater excavation device passes through the pipe fairlead, the multi-pipe reel and the slurry pipe reel; and the jib oil cylinder and the reel drive are electrically connected with the pipe reel hydraulic controller.

[0016] A pipe drag chain is arranged between the pipe fairlead and the multi-pipe reel, and the pipe drag chain has a hollow structure so that the pipe arranged on the multi-pipe reel penetrates into the pipe drag chain.

[0017] The grouting device comprises grouting pipes and grouting pumps; a grouting groove is formed between the assembled caisson body and the shaft wall; one end of each of the grouting pipes penetrates through the assembled caisson body and communicates with the grouting groove; the other end of each of the grouting pipes is connected with a plurality of grouting pumps arranged on the ground; a grouting flow meter is arranged on the grouting pipe; and the grouting pumps and the grouting flow meter are electrically connected with the grouting slurry controller.

[0018] The slurry device comprises a sludge discharge pipeline, a slurry pump, a sludge conveying pipeline, a sludge mixing pool and a sludge conveying pool; the sludge mixing pool and the sludge conveying pool are arranged on the ground beside the shaft body; the sludge mixing pool communicates with the sludge conveying pool through a purification treatment pool; one end of the sludge discharge pipeline is connected with the output end of the dredging pump of the underwater excavation device; the other end of the sludge discharge pipeline penetrates through the hollow structure of the floating platform, leads out of the assembled caisson body, passes through the pipe reel device and communicates with the sludge mixing pool; one end of the sludge conveying pipeline communicates with the sludge conveying pool; the other end of the sludge conveying pipeline leads into the assembled caisson body after passing through the pipe reel device; the slurry pump is arranged on the sludge conveying pipeline; and the slurry pump is electrically connected with the grouting slurry controller.

[0019] A liquid level meter is arranged on the inner wall of the assembled caisson body, and the liquid level meter is electrically connected with the grouting slurry controller.

[0020] The flow meter and the pressure sensor are electrically connected with the grouting slurry controller.

[0021] The visual interface includes an underwater excavation three-dimensional virtual interface, a pressure-raising propulsion interface, and a grouting, stratum disturbance, and alarm interface.

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

[0023] 1. The present application is provided with a propulsion suspension device and an underwater excavation device, which can be connected with the assembled caisson body in different ways through the lifting output end and the pressing output end, so as to realize different sinking modes of the assembled caisson body in different use stages under the control of the pressure-raising swing hydraulic controller, thereby better controlling the segment sinking amount and the caisson attitude, avoiding the problems of sudden sinking and uneven sinking of the segment in the prior art, and being beneficial to effectively controlling the ground settlement.

[0024] 2. The present application is provided with a pipeline reel device, a grouting device, and a slurry device, which fills the gap between the assembled caisson body and the well wall through the grouting device, reduces the frictional resistance when the segment sinks, discharges the soil excavated by the underwater excavation device through the slurry device, and injects the water level in the slurry balance assembled caisson body, thereby effectively controlling the sinking process of the assembled caisson body and further controlling the segment sinking amount and the caisson attitude.

[0025] 3. The present application is provided with a control device and a visual interface, the control device can control the propulsion suspension device, the pipeline reel device, the floating platform, the underwater excavation device, the assembled caisson body, the grouting device, and the slurry device, which can better control the ground settlement and control the uniform sinking of the assembled caisson body, and simultaneously display the caisson construction, stratum disturbance, and other state information in real time through the visual interface during the caisson construction process, improve the mechanization degree and the automation degree of the caisson construction, and thereby be beneficial to improving the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the active control type assembled mechanized caisson system of the present application;

[0027] Figure 2 is a structural schematic diagram of the propulsion suspension device in the active control type assembled mechanized caisson system of the present application;

[0028] Figure 3 is a structural schematic diagram of the pipeline reel device in the active control type assembled mechanized caisson system of the present application;

[0029] Figure 4is a structural schematic view of a floating platform in the active control type assembled mechanized caisson system of the present application;

[0030] Figure 5 is a structural schematic view of an underwater excavating device in the active control type assembled mechanized caisson system of the present application;

[0031] Figure 6 is a sectional view of a rotating table assembly in the active control type assembled mechanized caisson system of the present application;

[0032] Figure 7 is a sectional view of a mechanical arm assembly in the active control type assembled mechanized caisson system of the present application;

[0033] Figure 8 is a structural schematic view of a grouting device in the active control type assembled mechanized caisson system of the present application;

[0034] Figure 9 is a front view of a control device in the active control type assembled mechanized caisson system of the present application;

[0035] Figure 10 is a sectional view of a slurry device in the active control type assembled mechanized caisson system of the present application.

[0036] In the figure, 1 is a propelling suspension device, 101 is a propelling suspension support, 102 is a lifting driving member, 103 is a lifting connecting seat, 104 is a downward pressing top block, 105 is a segment lifting ring, 106 is a swinging base, 107 is a swinging driving member, 2 is a reel device, 201 is a reel base, 202 is a multi-tube reel, 203 is a mud pipe reel, 204 is a lifting boom, 205 is a boom oil cylinder, 206 is a pipe guide fairlead, 207 is a reel driving member, 208 is a pipe drag chain, 3 is a floating platform, 301 is a platform frame, 302 is a buoy, 303 is a walkway plate, 304 is a guardrail, 305 is a support frame, 306 is a lifter, 307 is a roller, 308 is an annular track, 309 is a first hollow part, 4 is an underwater excavating device, 401 is a fixed base, 403 is a swinging driving member, 404 is a dredging pump, 405 is a lifting driving member, 406 is a first pin shaft, 407 is a second pin shaft, 408 is an ear plate, 409 is a gear ring, 410 is a driving gear, 411 is a hydraulic driving member, 412 is a speed reducer, 413 is a slewing bearing, 414 is a turntable, 415 is a moving arm, 416 is a two-section arm, 417 is a telescopic driving member, 418 is a joint arm, 419 is a joint driving member, 420 is a first joint connecting rod, 421 is a third pin shaft, 422 is a fourth pin shaft, 423 is a fifth pin shaft, 424 is a sixth pin shaft, 425 is a seventh pin shaft, 426 is a second joint connecting rod, 5 is an assembled caisson main body, 501 is a cross beam, 502 is a blade foot ring, 503 is a caisson body pipe section, 6 is a grouting device, 601 is a mud sealing sleeve, 602 is a grouting pipe, 603 is a grouting pump, 604 is a mud flow meter, 7 is a control device, 701 is a central control room, 702 is a power distribution cabinet, 703 is a grouting mud water controller, 704 is a lifting and swinging hydraulic controller, 705 is an underwater excavating hydraulic controller, 706 is a reel hydraulic controller, 8 is a mud water device, 801 is a mud discharge pipeline, 802 is a slurry pump, 803 is a mud feeding pipeline, 804 is a mud mixing pool, 805 is a mud feeding pool, 806 is a liquid level meter, 807 is a flow meter, 808 is a pressure sensor, 9 is a visual interface. DETAILED DESCRIPTION

[0037] The application will be further described below in connection with the drawings and specific embodiments.

[0038] Please refer to the drawings Figure 1 , the drawings Figure 8 to the drawings Figure 10The application discloses an active control type assembled mechanized caisson sinking system, which comprises a propelling and suspending device 1, a pipeline reel device 2, a floating platform 3, an underwater excavating device 4, an assembled caisson main body 5, a grouting device 6, a control device 7, a slurry device 8 and a visual interface 9; a plurality of propelling and suspending devices 1 are arranged on the ground around the caisson body at intervals, and the assembled caisson main body 5 is suspended or pressed down into the caisson body through the plurality of propelling and suspending devices 1; the floating platform 3 floats on the water surface in the assembled caisson main body 5, a hollow structure is formed in the middle of the floating platform 3, so that the underwater excavating device 4 is suspended below the floating platform 3 and located at the bottom of the assembled caisson main body 5, the pipeline of the underwater excavating device 4 penetrates the floating platform 3 upwards through the hollow structure and winds around the pipeline reel device 2 after being led out of the assembled caisson main body 5, and the pipeline reel device 2 is arranged on the ground beside the caisson body; the grouting device 6 and the slurry device 8 are arranged on the ground outside the caisson body, the grouting device 6 grouts between the caisson wall and the outer wall of the assembled caisson main body 5, and the slurry device 8 is connected with the underwater excavating device 4; the control device 7 is electrically connected with the propelling and suspending device 1, the pipeline reel device 2, the floating platform 3, the underwater excavating device 4, the assembled caisson main body 5, the grouting device 6, the slurry device 8 and the visual interface 9 respectively.

[0039] Please refer to the accompanying drawings Figure 9 The control device 7 comprises a power distribution cabinet 702, a central control room 701, a grouting and slurry controller 703, a pressure lifting and swinging hydraulic controller 704, an underwater excavating hydraulic controller 705 and a reel hydraulic controller 706 which are electrically connected with the power distribution cabinet 702; the central control room 701 is connected with the grouting and slurry controller 703, the pressure lifting and swinging hydraulic controller 704, the underwater excavating hydraulic controller 705 and the reel hydraulic controller 706 respectively; the grouting and slurry controller 703 is electrically connected with the grouting device 6 and the slurry device 8, the pressure lifting and swinging hydraulic controller 704 is electrically connected with the propelling and suspending device 1, the underwater excavating hydraulic controller 705 is electrically connected with the underwater excavating device 4, the reel hydraulic controller 706 is electrically connected with the pipeline reel device 2, and the visual interface 9 is installed on the central control room 701.

[0040] The power distribution cabinet 702 is used for supplying power to the central control room 701, and the central control room 701 is used for supplying power, collecting signals and controlling instructions to the grouting and slurry controller 703, the pressure lifting and swinging hydraulic controller 704, the underwater excavating hydraulic controller 705 and the reel hydraulic controller 706. Remote control modules and a plurality of DI, DO and AI modules are used in the grouting and slurry controller 703, the pressure lifting and swinging hydraulic controller 704, the underwater excavating hydraulic controller 705 and the reel hydraulic controller 706 to control the start and stop of each driving part and the collection of signals of each sensor, and data interaction is carried out with the central control room 701 through communication.

[0041] Please refer to the accompanying drawings Figure 2Each of the prop-hanging devices 1 comprises a prop-hanging support 101, a pressure lifting driving member 102, a lifting connecting seat 103, and a downward pressing top block 104. The prop-hanging support 101 is installed on the ground around the assembled caisson body 5, the pressure lifting driving member 102 is installed on the prop-hanging support 101, and the pressure lifting driving member 102 is electrically connected with the pressure lifting swing hydraulic controller 704. The driving end of the pressure lifting driving member 102 is connected with one end of the lifting connecting seat 103, and the other end of the lifting connecting seat 103 is formed with a lifting output end in the middle. The top of the pipe piece pressure lifting ring 105 is installed with an ear hinge plate, so that the lifting output end is movably connected with the pipe piece pressure lifting ring 105 through the ear hinge plate and the pin shaft. One end of a pair of downward pressing top blocks 104 is respectively installed on the two sides of the other end of the lifting connecting seat 103, forming a downward pressing output end, and the other end of the pair of downward pressing top blocks 104 can be respectively pressed on the top surface of the pipe piece pressure lifting ring 105.

[0042] In the initial stage of the caisson construction, i.e. the stage when the overall weight of the assembled caisson body 5 and the underwater excavating device 4 is greater than the resistance, the sinking can be realized by the self weight. In this stage, the tension provided by the pressure lifting driving member 102 is used to balance the overall weight of the caisson.

[0043] Sixteen groups of anchor rods are arranged on the top of the well body pipe section 503 in the circumferential direction, and the pipe piece pressure lifting ring 105 is fixedly connected with the top of the well body pipe section 503 through the sixteen groups of anchor rods and the sixteen anchor rod installation holes. The pair of first ear hinge plates of the lifting connecting seat 103 are connected with the second ear hinge plates of the pipe piece pressure lifting ring 105 through the pressure ring pin shafts, forming the lifting output end, so as to facilitate the suspension of the assembled caisson body 5 through the pipe piece pressure lifting ring 105.

[0044] The pressure lifting driving member 102 can adopt the existing oil cylinder. When the caisson is sinking, the oil pressure of the oil cylinder of the pressure lifting driving member 102 is controlled by the pressure lifting swing hydraulic controller 704 of the control device 7, so that the driving ends of the pressure lifting driving members 102 slowly and synchronously extend, and the sinking of the caisson is realized. In this process, the entire caisson is suspended on the downward movement of the pressure lifting driving members 102 through the pressure ring pin shafts.

[0045] In the deeper stage of the caisson construction, the overall weight of the assembled caisson body 5 and the underwater excavating device 4 is smaller than the resistance, and at this time, the self weight of the caisson cannot realize the sinking. At this time, the first ear hinge plates of the lifting connecting seat 103 and the pressure ring pin shafts of the pipe piece pressure lifting ring 105 are not connected through the pressure ring pin shafts, the two sides of the lifting connecting seat 103 are pressed on the top surface of the pipe piece pressure lifting ring 105 through the downward pressing top blocks 104, forming the downward pressing output end, and under the action of the resistance, the reliable pressing between the downward pressing top blocks 104 and the pipe piece pressure lifting ring 105 can be ensured.

[0046] When the caisson is sinking, the hydraulic pressure swing controller 704 gives a certain amount of pressure to the pressure driving members 102 of several groups, controls the speed and pressure of the pressure driving members 102 of several groups, and synchronously slowly presses down, and the pressure is applied to the caisson pipe section 503 through the lifting and connecting seat 103, the down-pressing top block 104 and the pipe piece pressure ring 105, so as to realize the sinking construction of the caisson.

[0047] For the pressure driving members 102, the hydraulic pressure swing controller 704 can be independently controlled through several channels, so that the synchronous action and the individual action of the pressure driving members 102 can be realized, the synchronous action of the pressure driving members 102 can better control the overall sinking construction of the caisson, and the individual action of the pressure driving members 102 can more accurately adjust the posture of the caisson in the sinking process.

[0048] Please refer to the accompanying drawings Figure 2 The outer side of the pushing and suspending support 101 is provided with a swing assembly, the swing assembly includes a swing base 106 and a swing driving member 107; the bottom of the pushing and suspending support 101 is rotatably installed on the ground through a first hinged seat 108, the swing base 106 is fixedly installed on the ground outside the pushing and suspending support 101; the two ends of the swing driving member 107 are respectively hinged to the swing base 106 and the pushing and suspending support 101, and the swing driving member 107 is telescopically connected between the swing base 106 and the pushing and suspending support 101, so that the pushing and suspending support 101 can swing through the swing driving member 107; the swing driving member 107 is electrically connected with the hydraulic pressure swing controller 704.

[0049] The swing driving member 107 can adopt a hydraulic oil cylinder, when the assembled caisson main body 5 is completed once and needs to be installed, the assembled caisson main body 5 is fixed, the hydraulic pressure swing controller 704 controls the piston rod of the swing driving member 107 to retract, so that the pushing and suspending support 101 swings away from the assembled caisson main body 5 under the pulling of the piston rod of the swing driving member 107, expands the construction space above the vertical shaft 4, avoids the collision between the pushing and suspending support 101 and the pipe section during hoisting and fixing of the pipe section, and the amplitude of the outward swing of the pushing and suspending support 101 can be determined according to the space required by the pipe section installation. At this time, the oil pressure of the swing driving member 107 is maintained, the pushing and suspending support 101 is reliably supported through the swing base 106 and the swing driving member 107, and the pushing and suspending support 101 is prevented from falling down.

[0050] After the well body pipe section 503 is installed, the pressure lifting swing hydraulic controller 704 controls the piston rod of the swing driving part 107 to extend, so that the advancing suspension support 101 swings to the vertical state under the pushing of the piston rod of the swing driving part 107, and the next sinking well sinking construction can be carried out. At this time, the oil pressure of the swing driving part 107 is kept, and the advancing suspension support 101 is kept in the vertical state, so as to facilitate the posture control of the sinking well sinking.

[0051] Please refer to the accompanying drawings Figure 3 The pipeline reel device 2 comprises a reel base 201, a multi-pipeline reel 202, a slurry pipeline reel 203, a lifting boom 204, a boom oil cylinder 205, a pipeline fairlead 206 and a reel driving part 207. The reel base 201 is fixedly installed on the ground beside the well body through foundation bolts. One end of the lifting boom 204 is rotatably connected to the reel base 201 through a pin shaft, and the other end of the lifting boom 204 extends above the well body. The boom oil cylinder 205 is telescopically connected between the lifting boom 204 and the reel base 201. The pipeline fairlead 206 is arranged at the other end of the lifting boom 204. The multi-pipeline reel 202 and the slurry pipeline reel 203 are rotatably installed on the reel base 201 through the reel driving part 207. The multi-pipeline of the underwater excavating device 4 is wound around the pipeline fairlead 206, the multi-pipeline reel 202 and the slurry pipeline reel 203. The boom oil cylinder 205 and the reel driving part 207 are electrically connected to the reel hydraulic controller 706.

[0052] The reel base 201 is fixedly installed on the ground through foundation bolts, so as to ensure the stability of the entire pipeline reel device 2. The number of the reels of the multi-pipeline reel 202 and the slurry pipeline reel 203 can be adaptively adjusted according to the number of the pipelines of the underwater excavating device 4, so as to facilitate the arrangement and winding of different pipelines of the underwater excavating device 4.

[0053] The oil pressure of the boom oil cylinder 205 is controlled by the hydraulic controller 706 of the control device 7. The piston rod of the boom oil cylinder 205 is pushed out or retracted by the oil pressure, so as to drive the lifting boom 204 to rotate up and down relative to the reel base 201 around the pin shaft. The lifting boom 204 is used to bear the weight of all the pipelines on the multi-pipeline reel 202 and the slurry pipeline reel 203, and simultaneously realizes the adjustment of the height and the distance.

[0054] The reel driving part 207 can adopt a hydraulic motor. The hydraulic controller 706 controls the rotation of the hydraulic motor, so as to drive the multi-pipeline reel 202 and the slurry pipeline reel 203 to rotate, and realize the extension release and collection winding of the pipelines of the underwater excavating device 4.

[0055] Please refer to the accompanying drawings Figure 3The pipeline fairlead 206 is provided with a pipeline drag chain 208 between the pipeline fairlead 206 and the multi-pipeline reel 202, and the pipeline drag chain 208 is a hollow structure, so that the pipeline wound on the multi-pipeline reel 202 is penetrated in the pipeline drag chain 208.

[0056] The pipeline drag chain 208 can protect the hose pipeline, and avoid the wire from being excessively dragged and broken. The pipeline fairlead 206 is a circular structure, which is used for stably guiding the slurry pipeline and the pipeline drag chain 208, and preventing the surface damage of the pipeline from being caused by unevenness when the pipeline is reeled and unreeled.

[0057] Please refer to the accompanying drawings Figure 4 The floating platform 3 comprises a platform frame 301, a float 302, a walkway plate 303, a guardrail 304, a support frame 305, a lifting device 306 and a ring track 308. The platform frame 301 is in a cylindrical frame structure, and a first hollow part 309 is formed in the middle of the platform frame 301. The float 302 is embedded in the platform frame 301, so that the platform frame 301 can float in the assembled caisson body 5 through the float 302. The support frame 305 is installed at the top center of the platform frame 301. A pair of lifting devices 306 are rotatably installed on the support frame 305 through the ring track 308 and the roller 307. The output ends of the pair of lifting devices 306 are connected to the underwater excavating device 4 through steel wires, so that the pair of lifting devices 306 can rotate along the ring track 308 synchronously with the underwater excavating device 4. The walkway plate 303 is laid on the top surface of the platform frame 301 and located around the support frame 305. The guardrail 304 is vertically arranged at the top edge of the platform frame 301. An operation platform is formed between the walkway plate 303, the guardrail 304 and the support frame 305.

[0058] The platform frame 301 can overcome its own gravity and the gravity of the underwater excavating device 4 and float on the water surface in the assembled caisson body 5 through the positive buoyancy obtained by the float 302 in the water. Preferably, the float 302 is composed of a plurality of unit floats, and the platform frame 301 is composed of a plurality of fan-shaped frames connected. One unit float is arranged in each fan-shaped frame, so that the unit floats are arranged in the fan-shaped frames of the platform frame 301, which ensures the stability and uniformity of the buoyancy of the entire operation platform.

[0059] The walkway plate 303 is laid on the platform frame 301, which provides a deck-type operation platform for the installation of the grouting device 6 and the slurry device 8, the maintenance of the underwater excavating device 4 and other in-well operations, reduces the inconvenience of lifting the equipment to the ground for maintenance, and improves the construction efficiency. At the same time, the periphery is protected through the guardrail 404, which ensures the safety of the construction personnel on the operation platform.

[0060] When the underwater excavating device 4 is working normally, the output ends of the pair of elevators 306 are connected with the hanger of the underwater excavating device 4 through the steel wire ropes, and when the underwater excavating device 4 moves to the next working area, the steel wire ropes on the output ends of the pair of elevators 306 are lowered and move downward together with the underwater excavating device 4, without affecting the normal working of the underwater excavating device 4. When the underwater excavating device 4 stops moving downward, the steel wire ropes on the output ends of the pair of elevators 306 are kept in the tightened state.

[0061] The elevators 306 can be winches, and when the underwater excavating device 4 is working in rotation in the well, the pair of elevators 306 will rotate by the corresponding angle along the annular track 308 on the support frame 305 through the rollers 307 under the pulling force of the steel wire ropes in the tightened state, so that the pair of elevators 306 keep synchronous rotation, to prevent the steel wire ropes from being twisted and damaging the hydraulic pipelines of the elevators 306.

[0062] When the underwater excavating device 4 needs to be overhauled or maintained, the output ends of the pair of elevators 306 retract the lowered steel wire ropes, and hoist the underwater excavating device 4 together with the hanger thereof from the well bottom to the first hollow part 309, and then fix the hanger, to prevent the underwater excavating device 4 from rotating or falling, and the construction personnel on the operation platform can operate the underwater excavating device 4 for overhauling, maintaining and the like.

[0063] Please refer to the accompanying drawings Figure 8 and the accompanying drawings Figure 10 The assembled caisson body 5 comprises a cross beam 501, a blade foot ring 502 and well body pipe sections 503; the cross beam 501 is coaxially installed in the blade foot ring 502, the well body pipe sections 503 are assembled on the blade foot ring 502, and a plurality of well body pipe sections 503 are assembled in sequence from bottom to top; and the underwater excavating device 4 is installed at the top center of the cross beam 501.

[0064] The cross beam 501 and the blade foot ring 502 can be synchronously cast and formed, and the well body pipe sections 503 can be prefabricated and formed in the factory and assembled and constructed at the construction site along with the sinking of the assembled caisson body 5.

[0065] Please refer to the accompanying drawings Figure 5 to the accompanying drawings Figure 7The underwater excavating device 4 comprises a fixed base 401, a rotating table assembly, a mechanical arm assembly, a swing driving part 403, a dredging pump 404 and a lifting driving part 405; the fixed base 401 is fixedly installed at the top center of the cross beam 501 of the assembled caisson main body 5, the rotating table assembly is rotatably installed on the fixed base 401; the lifting driving part 405 is fixedly installed on the rotating table assembly, one end of the mechanical arm assembly is rotatably connected with the driving end of the lifting driving part 405 through a first pin shaft 406, and the bottom of the mechanical arm assembly close to the lifting driving part 405 is rotatably connected with an ear plate 408 on the rotating table assembly through a second pin shaft 407, so that the mechanical arm assembly can rotate horizontally synchronously with the rotating table assembly and vertically relative to the rotating table assembly through the lifting driving part 405 around the second pin shaft 407; the dredging pump 404 is swingably installed at the other end of the mechanical arm assembly through the swing driving part 403, so that the dredging pump 404 can rotate, lift or swing around the fixed base 401 to excavate soil, the dredging pump 404 is connected with the slurry device 8; and the swing driving part 403 is electrically connected with the underwater excavating hydraulic controller 705.

[0066] The main function of the dredging pump 404 is to excavate soil and discharge the excavated soil to the ground through a built-in slurry pump through the slurry discharge pipeline 801 of the slurry device 8 to the slurry mixing pool 804 on the ground, and to be treated through the slurry purification pool, and the deepest working depth can be 100 m under water. The dredging pump 404 is composed of a reamer head, a slurry pump and a shell. The reamer head and the slurry pump are respectively driven by independent hydraulic motors and can work independently. The reamer head has a bidirectional rotation function, and rotates in one direction in normal operation and reversely in the case of getting stuck. The slurry pump rotates in one direction and can only discharge in the positive direction, but cannot suck in the reverse direction.

[0067] Please refer to the accompanying drawings Figure 5 to the accompanying drawings Figure 7 The rotating table assembly comprises a gear ring 409, a driving gear 410, a hydraulic driving part 411, a speed reducer 412, a slewing bearing 413 and a rotating table 414; the rotating table 414 is rotatably connected with the outer ring of the slewing bearing 413 through a flange, the inner ring of the slewing bearing 413 is installed on the fixed base 401 through a flange, the hydraulic driving part 411 is connected through a flange and the speed reducer 412, the hydraulic driving part 411 is electrically connected with the underwater excavating hydraulic controller 705, the speed reducer 412 is installed on a motor base through a flange, the motor base is welded on the rotating table 414, the driving gear 410 is fixedly installed on the output shaft of the speed reducer 412 through a pressing plate, the driving gear 410 is meshingly connected with the inner ring of the gear ring 409, and the gear ring 409 is fixedly connected with the inner ring of the slewing bearing 413.

[0068] Please refer to the accompanying drawings Figure 5 to the accompanying drawings Figure 7The mechanical arm assembly comprises a movable arm 415, a two-section arm 416, a telescopic driving member 417, a joint arm 418, a joint driving member 419, a first joint connecting rod 420 and a second joint connecting rod 426; one end of the movable arm 415 is rotatably connected with the driving end of the lifting driving member 405 through a first pin shaft 406, and the bottom middle part of the movable arm 415 is rotatably connected with an ear plate 408 on the rotating table assembly through a second pin shaft 407; one end of the two-section arm 416 is inserted into the movable arm 415, the telescopic driving member 417 is fixedly installed on the outer wall of the movable arm 415, and the other end of the two-section arm 416 extends to the outside of the other end of the movable arm 415 and is fixedly connected with the driving end of the telescopic driving member 417; one end of the joint arm 418 is rotatably connected with the other end of the two-section arm 416 through a third pin shaft 421, the joint driving member 419 is rotatably installed on the inner wall top of the two-section arm 416 through a fourth pin shaft 422, the driving end of the joint driving member 419 extends to the outside of the other end of the two-section arm 416 and is rotatably connected with one end of the first joint connecting rod 420 and the second joint connecting rod 426 through a fifth pin shaft 423; the other end of the first joint connecting rod 420 is rotatably connected with the other end of the two-section arm 416 through a sixth pin shaft 424, and the other end of the second joint connecting rod 426 is rotatably connected with the middle part of the joint arm 418 through a seventh pin shaft 425; the dredging pump 404 is swingably installed at the other end of the joint arm 418 through the swing driving member 403; the telescopic driving member 417, the joint driving member 419 and the underwater excavation hydraulic controller 705 are electrically connected.

[0069] The fixed base 401 is fixedly installed on the top center of the cross beam 501 in a pre-buried screwing mode or the like, the underwater excavation hydraulic controller 705 of the control device 7 controls the hydraulic driving member 411 to start, the output shaft of the hydraulic driving member 411 drives the driving gear 410 to synchronously rotate after being decelerated by the speed reducer 412, the driving gear 410 meshes with the transmission gear ring 409, so that the rotating table 414 synchronously rotates on the fixed base 401 with the gear ring 409, thereby realizing the horizontal steering function of the dredging pump 404, which is used for adjusting the direction of the dredging pump 404 to excavate the soil.

[0070] The underwater excavation hydraulic controller 705 controls the driving end of the lifting driving member 405 to extend or retract, so as to drive the mechanical arm assembly to rotate up and down around the second pin shaft 407, thereby realizing the up-and-down rotation adjustment function of the dredging pump 404.

[0071] The underwater excavation hydraulic controller 705 controls the driving end of the telescopic driving member 417 to extend or retract, so as to drive the two-section arm 416 to extend out of the movable arm 415 or retract into the movable arm 415, thereby realizing the lengthening and shortening functions of the mechanical arm assembly, and the maximum extension is 1650 mm, so as to meet the needs of the dredging pump 404 to excavate the soil at different positions and depths.

[0072] The underwater excavation hydraulic controller 705 controls the driving end of the joint driving member 419 to extend or retract, so as to drive the joint arm 418, the first joint connecting rod 420 and the second joint connecting rod 426 to rotate relative to the other end of the two-joint arm 416, so as to realize the rotation of the dredging pump 404 away from or close to the fixed base 401, and further meet the needs of the dredging pump 404 to excavate the soil at different positions.

[0073] The underwater excavation hydraulic controller 705 controls the driving end of the swing driving member 403 to extend or retract, so as to drive the dredging pump 404 to swing left and right, thereby meeting the needs of the dredging pump 404 to excavate the soil in different directions.

[0074] Through the cooperation of the lifting driving member 405, the hydraulic driving member 411, the telescopic driving member 417, the joint driving member 419 and the swing driving member 403, the steering, up-down swinging, left-right swinging and telescopic movement of the dredging pump 404 are realized, which is used for excavating the soil at the well bottom in different regions, can meet the open caisson construction with an inner diameter of 8-10 m, a cross beam 502 height range of 1.5-2 m and a water pressure range of 0-10 kg, and is beneficial to the accurate and safe control of soil excavation.

[0075] Under the control of the underwater excavation hydraulic controller 705, one-key automatic excavation, zoned automatic excavation, rocker manual excavation and other functions can be further developed, and by collecting sensor data sets to set a safety domain set, the mechanical arm assembly of the underwater excavation device 4 can avoid obstacles such as the cross beam 501.

[0076] Please refer to the accompanying drawings Figure 8 The grouting device 6 comprises a mud sealing sleeve 601, a grouting pipe 602 and a grouting pump 603; a grouting groove is formed between the assembled open caisson body 5 and the well wall, the mud sealing sleeve 601 is circumferentially arranged around the four sides of the assembled open caisson body 5 and seals the top of the grouting groove; a plurality of grouting holes are formed on the blade foot ring 502 of the assembled open caisson body 5, so that one end of the plurality of grouting pipes 602 respectively penetrates the assembled open caisson body 5 through the plurality of grouting holes and communicates with the grouting groove, and the other end of the plurality of grouting pipes 602 is respectively connected with a plurality of grouting pumps 603 arranged on the ground; the grouting pipe 602 is provided with a grouting flow meter 604; the grouting pump 603 and the grouting flow meter 604 are electrically connected with a grouting mud water controller 703.

[0077] The grouting pump 603 injects the friction-reducing mud into the grouting groove between the assembled open caisson body 5 and the well wall through the grouting pipe 602, which is used to reduce the side wall friction resistance when the open caisson sinks, and also plays a role in filling the gap and supporting the soil. The grouting pump 603 can also inject the replacement mud into the grouting groove between the assembled open caisson body 5 and the well wall through the grouting pipe 602 after the open caisson construction is completed, which is used to replace the friction-reducing mud and restore the friction resistance of the side wall of the assembled open caisson body 5.

[0078] The grouting pump 603 can be controlled by the grouting slurry controller 703 of the control device 7, and the grouting mode can include manual grouting and automatic grouting, such as top manual grouting, middle automatic grouting, and bottom automatic grouting. The grouting process can be performed in axial and circumferential segments, the grouting of the same segment is simultaneously performed by multiple grouting pipes 602 from different directions, and the multiple grouting pipes 602 of the same segment are provided with slurry by one grouting pump 603. A flow meter can be arranged on the grouting pipe 602, which is used to feedback the cumulative grouting amount and the grouting amount at each ring well body pipe joint 503 during automatic grouting, so as to more accurately control the grouting process.

[0079] Please refer to the accompanying drawings Figure 10 The slurry device 8 includes a sludge discharge pipeline 801, a slurry pump 802, a sludge conveying pipeline 803, a sludge mixing pool 804, and a sludge conveying pool 805. The sludge mixing pool 804 and the sludge conveying pool 805 are respectively arranged on the ground beside the well body, and the sludge mixing pool 804 is communicated with the sludge conveying pool 805 through a purification treatment pool (not shown in the figure). One end of the sludge discharge pipeline 801 is connected with the output end of the dredging pump 404, the other end of the sludge discharge pipeline 801 penetrates through the hollow structure of the floating platform 3 and then leads out to the assembled caisson main body 5, and then passes through the pipeline winding device 2 and is communicated with the sludge mixing pool 804. One end of the sludge conveying pipeline 803 is communicated with the sludge conveying pool 805, and the other end of the sludge conveying pipeline 803 leads into the assembled caisson main body 5 after passing through the pipeline winding device 2. The slurry pump 802 is arranged on the sludge conveying pipeline 803, and the slurry pump 802 is electrically connected with the grouting slurry controller 703.

[0080] The sludge discharge pipeline 801 is used to discharge the slurry at the bottom of the well dredged by the dredging pump 404 into the sludge mixing pool 804, and the slurry is sent into the sludge conveying pool 805 after being purified by settling and other treatments in the sludge mixing pool 804, so that the treated slurry can be re-injected into the well body through the slurry pump 802 and the sludge conveying pipeline 803, so as to maintain the liquid level balance in the well body. The slurry pump 802 is controlled by the grouting slurry controller 703 of the control device 7. The dredging pump 404 can adopt a pump body driven by hydraulic power, and the slurry pump 802 can adopt a pump body driven by motor power.

[0081] Please refer to the accompanying drawings Figure 10 The inner wall of the assembled caisson main body 5 is provided with a liquid level meter 806, and the liquid level meter 806 is electrically connected with the grouting slurry controller 703.

[0082] The liquid level meter 806 is used to detect the liquid level height in the well body and feed back the liquid level height to the grouting slurry controller 703 of the control device 7, so as to control the start and stop operation of the slurry pump 802, so as to ensure that the liquid level height in the well meets the construction requirements.

[0083] Please refer to the accompanying drawings Figure 10The sludge discharge pipeline 801 and the sludge feeding pipeline 803 are respectively provided with a flow meter 807 and a pressure sensor 808, and the flow meter 807 and the pressure sensor 808 are electrically connected to the grouting slurry controller 703 of the control device 7.

[0084] The flow meter 807 is used for detecting the flow of the sludge discharge and the flow of the sludge feeding, and the pressure sensor 808 is used for detecting the internal pressure of the sludge discharge pipeline 801 and the sludge feeding pipeline 803, and feeding the flow information and the pressure information to the grouting slurry controller 703 of the control device 7, so as to facilitate the closed-loop control of the sludge discharge and the sludge feeding process.

[0085] The sludge discharge pipeline 801 and the sludge feeding pipeline 803 can be respectively provided with a hydraulic ball valve or a manual valve, so as to facilitate the control of the sludge discharge and the sludge feeding process. The sludge discharge pipeline 801 can be a hard pipe, and the sludge feeding pipeline 803 can be a soft pipe.

[0086] The visual interface 9 includes an underwater excavation three-dimensional virtual interface, a pressure-raising propulsion interface, and a grouting and stratum disturbance and alarm interface.

[0087] The three interfaces of the visual interface 9 realize the three-dimensional virtual presentation of the underwater excavation of the robot, cooperate with the field operators to quickly read the key construction parameters, give the pre-warning and alarm of the safety risk of the field construction, and the like.

[0088] The underwater excavation three-dimensional virtual interface is developed based on the digital twin concept, combines the three-dimensional virtual excavation of the underwater excavation device 4 with the two-dimensional plane trajectory of the dredge pump 404, and integrates the robot collision detection algorithm, so that the operator can read the bottom inclination and the offset degree of the assembled caisson body 5 to formulate the excavation scheme of the underwater excavation device 4. The collision alarm prompt information of the underwater excavation device 4 is obtained by combining the bottom soil excavation amount distribution and the collision detection algorithm, and the actual operation feedback is actively given and displayed on the underwater excavation three-dimensional virtual interface.

[0089] The pressure-raising propulsion interface integrates the parameters of the assembled caisson body 5, the pressure-in parameters and the pressure-in force vector of the pressure-raising driving member 102, and the construction progress information, so that the propulsion suspension device and the sinking action of the assembled caisson body 5 are strongly associated.

[0090] The grouting, stratum disturbance and alarm interface combines the grouting system and the stratum disturbance response, which is beneficial to the reasonable judgment of the operator on the control of the grouting device 6, and effectively controls the grouting amount and the grouting progress. The whole system alarm function of the caisson construction is located at the lower right of the interface, which is divided into two blocks of equipment and construction, and is used for listing the alarm information and setting the alarm level, so as to facilitate the operator to check, evaluate and respond.

[0091] The above merely preferred embodiments of the present application are not intended to limit the scope of the application, thus, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. An active control type fabricated mechanized caisson system, characterized by: The utility model relates to a kind of floating assembly sinking well system, including propulsion suspension device (1), pipeline reel device (2), floating platform (3), underwater excavating device (4), assembled well body (5), grouting device (6), control device (7), slurry device (8) and visualization interface (9);Several propulsion suspension devices (1) are respectively arranged at the ground around shaft body, and assembled well body (5) is suspended or pressed into shaft body by several propulsion suspension devices (1);Floating platform (3) floats on the water surface in assembled well body (5), and the middle part of floating platform (3) is formed with hollow structure, so that underwater excavating device (4) is suspended below floating platform (3) and located at the bottom of assembled well body (5), and the pipeline of underwater excavating device (4) is upwardly penetrated through floating platform (3) and wound through pipeline reel device (2) after being led out of assembled well body (5), and pipeline reel device (2) is arranged on the ground beside shaft body;Grouting device (6) and slurry device (8) are arranged on the ground outside shaft body, grouting device (6) grouts between shaft wall and the outer wall of assembled well body (5), and slurry device (8) is connected with underwater excavating device (4);Control device (7) is electrically connected with propulsion suspension device (1), pipeline reel device (2), floating platform (3), underwater excavating device (4), assembled well body (5), grouting device (6), slurry device (8) and visualization interface (9) respectively; The control device (7) includes a switch board (702) and a central control room (701), a grouting slurry controller (703), a pressure lifting swing hydraulic controller (704), an underwater excavation hydraulic controller (705) and a reel hydraulic controller (706) electrically connected with the switch board (702), the central control room (701) is connected with the grouting slurry controller (703), the pressure lifting swing hydraulic controller (704), the underwater excavation hydraulic controller (705) and the reel hydraulic controller (706), the grouting slurry controller (703) is electrically connected with the grouting device (6) and the slurry device (8), the pressure lifting swing hydraulic controller (704) is electrically connected with the propulsion suspension device (1), the underwater excavation hydraulic controller (705) is electrically connected with the underwater excavating device (4), the reel hydraulic controller (706) is electrically connected with the pipeline reel device (2), and the visualization interface (9) is installed on the central control room (701). The pipeline reel device (2) comprises a reel base (201), a multi-pipeline reel (202), a slurry pipeline reel (203), a lifting boom (204), a boom cylinder (205), a pipeline fairlead (206) and a reel drive (207); the reel base (201) is fixedly installed on the ground beside the well body, one end of the lifting boom (204) is rotatably connected to the reel base (201), the other end of the lifting boom (204) extends above the well body, the boom cylinder (205) is telescopically connected between the lifting boom (204) and the reel base (201); the pipeline fairlead (206) is arranged at the other end of the lifting boom (204), the multi-pipeline reel (202) and the slurry pipeline reel (203) are rotatably installed on the reel base (201) through the reel drive (207), the multi-pipeline of the underwater excavating device (4) passes through the pipeline fairlead (206), the multi-pipeline reel (202) and the slurry pipeline reel (203) in sequence; the boom cylinder (205) and the reel drive (207) are electrically connected to the reel hydraulic controller (706).

2. The active control type fabricated mechanized caisson system according to claim 1, characterized in that: The pipeline fairlead (206) and the multi-pipeline reel (202) are provided with a pipeline drag chain (208), the pipeline drag chain (208) has a hollow structure, and the pipeline arranged on the multi-pipeline reel (202) penetrates into the pipeline drag chain (208).

3. The actively controlled fabricated mechanized caisson system of claim 1, wherein: The grouting device (6) comprises grouting pipes (602) and grouting pumps (603); a grouting groove is formed between the assembled caisson body (5) and the well wall, one end of each of the grouting pipes (602) penetrates through the assembled caisson body (5) and communicates with the grouting groove, the other end of each of the grouting pipes (602) is connected to a plurality of grouting pumps (603) arranged on the ground; the grouting pipes (602) are provided with grouting flow meters (604); the grouting pumps (603) and the grouting flow meters (604) are electrically connected to the grouting slurry controller (703).

4. The actively controlled fabricated mechanized caisson system of claim 1, wherein: The slurry device (8) comprises a sludge discharge pipeline (801), a slurry pump (802), a sludge conveying pipeline (803), a sludge mixing pool (804) and a sludge conveying pool (805); the sludge mixing pool (804) and the sludge conveying pool (805) are arranged on the ground beside the well body, the sludge mixing pool (804) communicates with the sludge conveying pool (805) through a purification treatment pool; one end of the sludge discharge pipeline (801) is connected to the output end of the dredging pump (404) of the underwater excavating device (4), the other end of the sludge discharge pipeline (801) penetrates through the hollow structure of the floating platform (3) and then leads out the assembled caisson body (5), and then passes through the pipeline reel device (2) and communicates with the sludge mixing pool (804); one end of the sludge conveying pipeline (803) communicates with the sludge conveying pool (805), the other end of the sludge conveying pipeline (803) leads into the assembled caisson body (5) after passing through the pipeline reel device (2); the slurry pump (802) is arranged on the sludge conveying pipeline (803), and the slurry pump (802) is electrically connected to the grouting slurry controller (703).

5. The actively controlled fabricated mechanized caisson system of claim 4, wherein: The inner wall of the assembled well sinking body (5) is provided with a liquid level meter (806), and the liquid level meter (806) is electrically connected with the grouting slurry controller (703).

6. The actively controlled fabricated mechanized caisson system of claim 4, wherein: The mud discharge pipeline (801) and the mud feeding pipeline (803) are both provided with a flow meter (807) and a pressure sensor (808), and the flow meter (807) and the pressure sensor (808) are electrically connected with the grouting slurry controller (703).

7. The actively controlled fabricated mechanized caisson system of claim 1, wherein: The visual interface (9) comprises an underwater excavation three-dimensional virtual interface, a pressure increasing propulsion interface and a grouting, stratum disturbance and alarm interface.

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