35 results about "Relief well" patented technology

A method comprises retrieving attributes of a blowout well and a relief well and simulating a dynamic kill of a blowout from the blowout well via a kill mud pumped down through the relief well, wherein the simulating comprises determining a flowing bottom hole pressure for the blowout well and the relief well based on an intersection of a reservoir inflow performance relationship (IPR) curve and a wellbore vertical lift (VLP) curve.

The invention particularly discloses an application method of an efficient well flow unit for simulating a decompression wellbore in a three-dimensional finite element, and relates to the technical field of civil engineering precipitation. The method comprises the steps of firstly determining parameters such as a model calculation boundary, boundary conditions, permeability coefficients of soil layers, the position of a relief well and a water head; secondly, establishing a three-dimensional model to divide a delaunay tetrahedron unit grid, and simplifying a three-dimensional relief well into a one-dimensional well flow unit during modeling; then, on the basis of geometric properties of a tetrahedral mesh around a well flow unit and a unit flow weight coefficient, making a numerical solution equal to an analytical solution flow, and deducing to obtain a well flow unit water guide matrix; and finally, merging the well flow unit water guide matrix into the total stiffness matrix, and solving to obtain the high-precision flow of the decompression wellbore and the node water head of the model unit. According to the method, the calculation efficiency and the calculation precision are greatly improved, the precision is not changed in a large-grid-size model, the calculation time is greatly shortened, and the investment of calculation resources is reduced.

The invention relates to an old well open hole section tracking and identifying method and device. The old well open hole section tracking and identifying method comprises the steps that a rescue well is drilled till the rescue well is communicated with an open hole section of an old well; determining a reference position in the old well, and taking the reference position as an initial position for tracking and identifying an open hole section of the old well; an ultrasonic detection positioning device is put into the old well to the initial position; the ultrasonic detection positioning device carries out ultrasonic detection in the circumferential direction of the rescue well from the initial position, and an ultrasonic detection result is obtained; wherein the ultrasonic detection result comprises the identified position of the sediment in the old well, and / or the position of the original stratum, and / or the junction position between the sediment in the old well and the original stratum; and according to the ultrasonic detection result, the drilling direction of the rescue well is adjusted, so that the drilling direction of the rescue well faces the old well or is kept consistent with the extending direction of the old well. According to the invention, the technical problem that the accuracy of tracking and identifying the borehole trajectory of the open hole section of the old well is poor is solved.

The invention relates to the technical field of oil field drilling and production, in particular to a borehole trajectory design method, device, equipment and medium of a rescue well, the method comprises the following steps: according to actually measured well trajectory data of a target well, selecting a long straight well section or a long stable inclined section on the trajectory as a target communicated well section; the midpoint of the target connected well section is taken as a first engineering target point of first trial drilling connection, and space coordinate data of the first engineering target point are recorded and comprise geodetic coordinates and vertical depth; drawing a preliminary well track from a new drilling well mouth to the first engineering target spot, obtaining a first vertex coordinate corresponding to the top end point of the last stable inclination section of the preliminary well track and a second vertex coordinate corresponding to the top end point of the target communication well section, and designing a communication collision point and a collision section drilling track according to the target well track condition, the single-time trial drilling communication success rate is increased, the trial drilling frequency is reduced, and the target well risk hidden danger is eliminated after communication is achieved.

The invention provides a precise landslide zoning treatment method based on a synergistic effect of drainage and pressure reduction, which is used for treating slope instability caused by underground water and comprises the following steps: S1, determining the property of a water-containing layer where a sliding surface of a landslide is located according to geological exploration data; s2, determining the type classification principle of the drainage well and the relief well according to the property of the aquifer; s3, determining partitions of the front edge, the rear edge and the middle of the landslide according to geological exploration data; s4, according to the property of the aquifer where the sliding surface is located and the landslide partition, the types and the cooperation scheme of the drainage well and the relief well are selected; and S5, precise landslide subarea treatment under the synergistic effect of drainage and pressure reduction is completed.

The utility model relates to a pressure relief construction node, belongs to the technical field of pressure relief and drainage, and particularly relates to a water diversion and pressure relief construction node for a pressure relief well connecting pipe. The well pipe is fixedly communicated with the interior of the bottom plate; and the water collecting pit is fixedly installed on one side of the bottom plate, and a water suction pump is fixedly installed in the water collecting pit. The utility model achieves the effect of very strong economic benefit and social benefit, and solves the problems that the existing pressure relief well is exposed outside the bottom plate for a long time, a large amount of underground water flows out through the pressure relief well in a flood season, water is accumulated in the basement, civilized construction is poorer, and the other part of pressure relief well is positioned on the main path of the basement construction road. And the pressure relief well is damaged due to lack of pressure relief well finished product protection measures.

The utility model discloses a water delivery system pressure relief device which comprises an upstream water supply pipe, a valve well, a pressure relief well and a water discharge pipe, the pressure relief well is arranged on the downstream of the valve well, an overflow partition wall is arranged in the pressure relief well, the water outlet end of the upstream water supply pipe is located in an energy dissipation pool after the upstream water supply pipe penetrates through the valve well, and a pressure relief valve is arranged in the valve well. The pressure reducing valve is connected to the upstream water inlet pipe, the water outlet end of the upstream water inlet pipe is bent downwards and then faces the bottom of the energy dissipation pool, the interval between the top end of the overflow partition wall and the top plate of the pressure reducing well is an overflow opening, and the water inlet end of the water discharging pipe is connected to the downstream side wall of the pressure stabilizing pool. Water coming from the upstream water incoming pipe is directionally jetted to the bottom of the energy dissipation pool from the water outlet end of the upstream water incoming pipe after being decompressed for the first time through the pressure reducing valve, then overflows into the pressure stabilizing pool after being decompressed for the second time, and is finally conveyed to the downstream through the water discharging pipe, so that the purposes of improving the pressure reducing efficiency and reliably stabilizing pressure through double pressure reduction are achieved. And an innovative solution is provided for pressure reduction of the water delivery system.

The invention relates to the field of petroleum drilling engineering, in particular to an experimental device for simulating the well killing effect of a rescue well under different communication points. According to the technical scheme, a visual transparent outer shaft, an annular inner shaft, an upper plug and a lower plug form a shaft unit, a simulated rescue well, an angle sensor, a universal connector, an angle adjusting mechanism and a steel hoop form a rescue well unit, and an upper liquid outlet pipeline, a liquid storage tank, a stirrer, a screw pump and a kill fluid injection pipeline form a kill fluid injection unit. The air compressor, the pressure reducing valve, the pressure stabilizing valve, the gas flow regulator, the one-way valve and the gas inlet pipeline form a gas injection unit. The device has the beneficial effects that the simulation rescue well is connected through the universal connector and the angle adjusting mechanism, the complex flowing process of gas invasion and pressure back in a shaft can be simulated when the rescue well at different angles is killed, and the gas-liquid flowing rules of the rescue well at different angles, well killing fluid with different viscosities and at different flow speeds can be clearly observed.

The invention discloses a foundation pit anti-inrush self-flow controllable drainage pressure relief well construction method and a pressure relief well system, and belongs to the field of foundation pit anti-inrush, and the method comprises the following steps: S1, determining the number and the arrangement mode of pressure relief wells; s2, relief well system construction is conducted; S21, relief wells are arranged within the range of the foundation pit supporting structure according to the determined number and arrangement mode of the relief wells; s22, an annular drainage ditch is dug along the inner edge of the foundation pit, and the annular drainage ditch communicates with the decompression well through a drainage hose; s23, at least one water collecting well is arranged in the range of the foundation pit supporting structure, and the water collecting well communicates with the annular drainage ditch; and S3, the foundation pit is excavated in a layered mode, and in the excavation process, the wellhead elevation of the relief well is dynamically and synchronously adjusted based on the current foundation pit excavation face elevation. By the adoption of the foundation pit inrush-surge-resistant self-flowing controllable drainage pressure relief well construction method and the pressure relief well system, electric-power-free self-flowing drainage can be achieved through the formation water head difference, and precise pressure relief is achieved.

In one embodiment, a method for treating one or more wells comprises: combining a liquid concentrated chlorine bleach with water on-site at the one or more wells; generating gaseous chlorine on-site; adding the gaseous chlorine into the water combined with the liquid concentrated chlorine bleach to produce a field treating solution on-site; and delivering the field treating solution into the one or more wells.

The application discloses a kind of deep foundation pit underground water level three-dimensional visualization monitoring methods, comprising: generating the three-dimensional underground retaining wall of deep foundation pit;Automatic generation and update are located in the three-dimensional underground retaining wall of deep foundation pit in pit inside and outside water level fitting three-dimensional curved surface diagram;Automatic identification and mark the highest point and the lowest point of pit inside and outside water level;Mark the depth of underground safety water level of deep foundation pit;Automatic generation and update are in three-dimensional position of the relief well of opening state;According to pit inside and outside water level fitting three-dimensional curved surface diagram and its highest point and the lowest point of pit inside and outside water level, and three-dimensional position of pit inside relief well in opening state, three-dimensional visualization monitoring is carried out to deep foundation pit underground water level.The application can carry out visualization monitoring to deep foundation pit underground water level, improves the comprehensiveness, accuracy and timeliness of monitoring.

This invention discloses a construction method and system for a self-flowing controllable drainage and pressure relief well for foundation pits, belonging to the field of foundation pit anti-surge. The method includes the following steps: S1, determining the number and arrangement of pressure relief wells; S2, construction of the pressure relief well system: S21, arranging pressure relief wells within the foundation pit support structure according to the determined number and arrangement; S22, excavating a ring-shaped drainage ditch along the inner edge of the foundation pit and connecting the ring-shaped drainage ditch to the pressure relief wells using a drainage hose; S23, setting at least one water collection well within the foundation pit support structure, ensuring the water collection well is connected to the ring-shaped drainage ditch; S3, excavating the foundation pit in layers, and dynamically adjusting the wellhead elevation of the pressure relief wells based on the current foundation pit excavation surface elevation during the excavation process. Using the above-mentioned construction method and system for a self-flowing controllable drainage and pressure relief well for foundation pits, the difference in formation water head can be used to achieve gravity-flow drainage without electricity, realizing precise pressure relief.

The utility model relates to a pressure relief well belongs to pressure relief well technical field, concretely is a kind of pressure relief well with permanent pressure relief effect, including bottom plate, the bottom plate is equipped with pressure relief well, floor is poured on the bottom plate, steel plate is fixedly connected in pressure relief well, steel plate is fixedly connected with pressure relief pipe on it, ball valve is equipped on the pressure relief pipe, high-strength grouting material is equipped on the steel plate, floor is movably inserted with cover plate, four clamping grooves are set up on the floor, recess is set up in the cover plate;In the utility model, by multilayer structure design and end installation ball valve, late stage can be directly connected pipe water diversion pressure relief, realizes the long-term stable pressure relief effect, and pressure relief well position leakage can be promptly repaired, reduces floor leakage situation, by cover plate, recess, clamping plate, limit post, connecting plate, spring, rotating plate, limit slot and slot cooperation, locking cover plate, avoid irrelevant personnel to open cover plate, operate ball valve, cause danger.

The utility model discloses a device for testing the clogging mechanism of a pressure relief well filter layer under the two-way alternating action of unclogging current and turbidity current. Comprising a muddy water system, a test tank base, an organic glass tank fixed on the test tank base, a sample bottom support plate arranged at the bottom of the organic glass tank, a porous well pipe mounted on the sample bottom support plate, an inverted filter layer fixing frame mounted on the outer wall of the porous well pipe, and an inverted filter layer sample fixed in the inverted filter layer fixing frame, an inverted filter sample is divided into at least three parts by partition plate clamping grooves, a sample bottom supporting plate is supported on a test tank base through a bottom supporting plate annular support, a bottom water tank is formed between the sample bottom supporting plate and the test tank base, and clear water is introduced into the bottom water tank through a bottom water inlet pipe; the top of the porous well pipe is covered by a sample cover plate, the top of the organic glass tank is covered by a top fixing cover, a top muddy water tank is formed between the sample cover plate and the top fixing cover, and the top muddy water tank is used for receiving muddy water provided by a muddy water system. According to the utility model, the two-way alternating effect of clear and turbid water flow and the quantitative test of the whole clogging process can be realized.

This application discloses a pressure relief well and its construction method, relating to the field of anti-buoyancy technology in underground engineering. The pressure relief well is located within a drilled borehole and includes: a first wellbore located in the region corresponding to the aquitard within the borehole; a second wellbore located in the region corresponding to the aquifer within the borehole, the second wellbore being a permeable structure; a bottom plate located at the bottom of the borehole; a well shoe located at the bottom of the borehole and capable of preventing the bottom plate from floating; a first shock-absorbing support vertically located between the first and second wellbores, one end of the first shock-absorbing support connected to the first wellbore and the other end connected to the second wellbore, with a gap between the first and second wellbores to allow for vertically repositionable relative displacement; and a second shock-absorbing support laterally located between the first and second wellbores to allow for horizontally repositionable relative displacement. The above structure can improve the seismic resistance of the pressure relief well.

The invention relates to the technical field of municipal engineering, and provides a pressure relief well construction method based on a steel casing, which comprises the following steps: constructing the steel casing; water stopping and reinforcing are conducted on the pipe connecting-in area outside the cylinder; dewatering in the cylinder, carrying out layered excavation and pouring a bottom plate; the pressure flow pipeline is connected into the steel casing and is installed with the bent connecting pipe and the vertical communicating pipe; the earthwork backfilling and gravity flow pipeline is connected into the steel casing; constructing a pressure relief well in the cylinder, and connecting a gravity flow pipeline and a pressure flow pipeline into the pressure relief well; earthwork backfilling is conducted after the pressure relief well is completed, and a pressure well lid and a cover plate are installed. Under the limited construction environment that underground pipelines are dense and complex, the steel casing is adopted to replace a traditional enclosure structure, and pressure relief well construction and connection of a pressure flow pipeline and a gravity flow pipeline are completed in the steel casing. Rapid construction can be achieved in a limited environment, investment is saved, and the construction period is shortened.

This invention discloses a clustered directional down-the-hole hammer drill bit for drilling large-diameter rescue wells. Further, it includes: a mounting body, multiple down-the-hole hammer units, multiple linear drive mechanisms, a monitoring mechanism, and a numerical control system. Each down-the-hole hammer unit is slidably mounted on the mounting body. The multiple down-the-hole hammer units are distributed circumferentially at intervals along the mounting body. Each linear drive mechanism is disposed on the mounting body. The output end of each linear drive mechanism drives and connects to its corresponding down-the-hole hammer unit. The monitoring mechanism is disposed on the mounting body, with its detection end facing the ground surface. The monitoring mechanism is used to detect the ground environment. The numerical control system is disposed on the mounting body, and its signals are connected to each linear drive mechanism and the monitoring mechanism. The numerical control system is used to control the operation of each linear drive mechanism based on the detection data from the monitoring mechanism, so as to adjust the working mode of each down-the-hole hammer unit according to the ground environment.

A method comprises retrieving attributes of a blowout well and a relief well and simulating a dynamic kill of a blowout from the blowout well via a kill mud pumped down through the relief well, wherein the simulating comprises determining a flowing bottom hole pressure for the blowout well and the relief well based on an intersection of a reservoir inflow performance relationship (IPR) curve and a wellbore vertical lift (VLP) curve.

According to the intelligent pressure reduction system test simulation device for simulating tailing pond dam pore water under multiple working conditions, the dam body model is arranged in the box body, the pressure reduction well system is arranged on the dam body model, and the pore water pressure can rise under the action of vibration load or earthquake, so that the pore water pressure is pressed into the pressure reduction well; when the water pressure in the relief well is detected to exceed a threshold value, the water seepage pipe is layered, active water pumping is carried out on the relief well, then layered pressure reduction is carried out on underground water, and accidents caused by instability of the dam body are prevented. A water seepage pipe is driven into a tailing pond dam, the lower end of the water seepage pipe is arranged below a seepage line, a plurality of outer water seepage holes are formed in the water seepage pipe, a water pressure sensor is installed at the bottom of the water seepage pipe, a plurality of water seepage nets are vertically arranged in the water seepage pipe at intervals, and water pumps are installed below each water seepage net and above the water seepage net at the uppermost end. A vibration motor, a detection sensor and a rainfall simulation system are arranged on the experiment box to simulate various parameters of the reservoir dam.

According to the safe and intelligent pressure reduction system for the vertical pressure reduction well of the tailing pond dam, the pressure reduction well system is arranged, and when the water pressure in the pond dam rises under the action of vibration loads or earthquakes and the water pressure in the pressure reduction well exceeds a threshold value, part of water enters the pressure reduction well. Active water pumping is carried out through the layered water seepage pipe, so that layered pressure reduction is carried out on underground water, and accidents caused by liquefaction instability of the tailing pond dam body due to the too high seepage line are prevented. According to the technical scheme, an external water seepage pipe is driven into a tailing pond dam, the lower end of the external water seepage pipe is arranged below a seepage line, a plurality of external water seepage holes are formed in the external water seepage pipe, a water pressure sensor is installed at the bottom of the external water seepage pipe, and a plurality of water seepage nets are vertically arranged in the external water seepage pipe at intervals; water pumps are installed below each water seepage net and above the water seepage net at the uppermost end, the water pumps are communicated to the outside of the water seepage pipe through drainage pipes, and the water pumps and the pressure reduction sensors are connected into an electric control box arranged outside the water seepage pipe.

The invention relates to the technical field of underground coal gasification, and discloses a method for constructing a rescue well of an underground coal gasification furnace, which comprises the following steps of: 1, switching the operation mode of the underground gasification furnace according to the blockage condition of a product well, and shifting the underground gasification furnace out of a normal production process; 2, according to data of an existing underground instrument system, the blocking position of a gas transmission channel is determined; 3, when the product well is completely blocked and production cannot be carried out, a gas transmission channel is newly built through the well drilling sidetracking windowing technology according to the blocked position; aiming at the condition that the gas transmission channel of the product well is blocked due to stratum stress change and the like and cannot be solved in the prior art, the gas transmission channel is rebuilt by sidetracking windowing or newly drilling a rescue well and the like, production is recovered by utilizing reverse combustion and the like, and the gas transmission channel is communicated with the injection well, so that the blocking problem can be effectively solved, and the production continuity and efficiency of the gasification furnace are guaranteed.

The integrated relief well comprises a supporting bottom plate, a vertical inner well pipe is fixedly arranged at the upper end of the supporting bottom plate, the inner well pipe is cylindrical, an upper plate is fixedly arranged at the upper end of the inner well pipe, a well opening communicated with the inner well pipe is formed in the upper plate, and the upper end of the well opening extends upwards to form a well ring. The upper end cover of the well ring is provided with a well cover, the outer wall of the inner well pipe, the upper plate and the outer wall of the well ring are all provided with reinforcing layers, a pipe network, a water pump, a pressure reducing valve and a pressure release valve are arranged in the inner well pipe, two through holes are formed in the side wall of the inner well pipe and penetrate through the reinforcing layers, and a water inlet pipe and a water outlet pipe which are connected with the pipe network penetrate through the two through holes respectively. When a well hole is drilled or the relief well module is integrally produced in advance, and then the relief well module is directly hoisted into the well hole to be installed, so that the site construction time is shortened, and the construction efficiency is improved.

The invention discloses a confined water foundation pit underground water control method and device and electronic equipment, and relates to the field of foundation pit engineering safety or other related technical fields, and the method comprises the steps: analyzing the distribution characteristics of a rock-soil layer and the type of underground water, and measuring and calculating the confined water pressure of a foundation pit; based on the pressure of the confined water, checking calculation analysis is conducted on the bottom of the pit collapsed by the confined water, the overburden layer elevation is obtained, and the overburden layer elevation is used for determining the excavation limiting elevation where measures need to be taken to prevent piping; carrying out seepage stability analysis on the basis of the elevation of the overburden layer, determining the position and the bottom elevation of a water cut-off curtain, and generating a water cut-off curtain scheme; a finite element software model is adopted to calculate the seepage flow of the foundation pit, a pressure relief well is arranged according to the calculation result of the seepage flow of the foundation pit and the conditions of the foundation pit, and the pressure relief well is utilized to discharge and flatten confined water. The technical problem that in the prior art, when underground water control cannot be conducted in foundation pit engineering, pressure relief well design is conducted in a trial-and-error mode, and efficiency is low is solved.

This invention relates to the field of municipal drainage technology, and more particularly to a pressure relief well and a water flow energy dissipation method. The pressure relief well includes an inlet pipe and an energy dissipation and anti-scour device; the outlet of the inlet pipe is located at the bottom of the well and faces upwards, and the anti-scour device is located at the outlet of the inlet pipe; the energy dissipation and anti-scour device includes an energy dissipation basin and an energy dissipation ring, the energy dissipation ring protruding upwards from the bottom of the well and surrounding the energy dissipation basin; the energy dissipation basin includes grid bars and at least two energy dissipation discs, the grid bars being arranged between the energy dissipation discs and between the energy dissipation discs and the bottom of the well, the diameter of the upper energy dissipation disc being larger than the diameter of the lower energy dissipation disc, and each energy dissipation disc having an energy dissipation hole. This invention solves the problem of water flow impact on drainage wells and extends the service life of drainage wells.

The application discloses a foundation protection method on a karst underground river in a low-lying area around a reservoir, and the method can reduce the pressure head of the karst confined water in the field area, reduce the floating force of the clay layer on the top of the karst underground river, and avoid the damage of the foundation caused by the sudden gushing of the karst underground river; when the reservoir water level suddenly drops, the underground water level in the karst underground river system suddenly drops, and at this time, a part of the karst cave under the foundation is in a vacuum state, causing the engineering geological problems of ground karst collapse and uneven settlement of the foundation; at this time, the air supplied through the pressure relief well can solve the above engineering geological problems.

The utility model relates to the technical field of subway station foundation pit engineering construction, concretely relates to a kind of station foundation pit inside pressure-relief well auxiliary well sealing device, wherein, including solid wall well pipe, grouting steel pipe, grouting head, sealing steel sheet, grouting mouth, overflow mouth, grouting equipment, grouting pipe, bolt and flange, to the problem that slurry is not dense, and later leakage due to the influence of pressure water for the existing pressure-relief well well sealing mode, the device eliminates the influence of pressure water by connecting high existing reserved precipitation well pipe, and using the mode of grouting from lower part to upper part to ensure grouting dense, with the advantages of simple production, simple operation, reusable, reliable well sealing quality, etc., can effectively avoid pressure-relief well later repeated leakage, protect normal use of station, reduce later maintenance cost.

The invention provides an active pressure relief and drainage system under a cushion layer based on the negative pressure principle. A solution is provided for improvement of traditional pressure relief well construction and arrangement in the aspects of universality, construction and maintenance convenience, building structure integrity guarantee and the like. Through the arrangement of the extensible debugging structure of the drainage network system, the design requirement and the trouble that a plurality of pressure relief wells are arranged in the necessary area range and the size in the prior art are avoided, and the drainage network system is more suitable for various building structure forms. The drainage network system is laid on the lower portion of the cushion layer and can be perfectly matched with the type of the cushion layer, and deformation of the cushion layer and an upper bottom plate caused by too high underground water pressure is avoided. The design position of the pressure relief well is more flexible, and the pressure relief well can be arranged outdoors or inside an independent working area facilitating follow-up drainage operation. Digging and hole reserving do not need to be conducted on the bottom plate and the cushion layer, and damage to the integrity of the building structure caused by arrangement of the pressure relief well is reduced.

The utility model relates to a well sealing structure of a foundation pit pressure relief well, which comprises a dewatering well, a well sealing layer group and a construction assembly, the dewatering well is positioned in a foundation pit, and the well sealing layer group is arranged in the dewatering well. The well sealing layer set is composed of a gravel concrete mixing layer, a first micro-expansive concrete layer, prefabricated concrete columns, a second micro-expansive concrete layer, a steel plate with round holes and a third micro-expansive concrete layer. The gravel concrete mixing layer, the first micro-expansive concrete layer, the prefabricated concrete column, the second micro-expansive concrete layer, the steel plate with the round holes and the third micro-expansive concrete layer are sequentially filled from bottom to top, the construction assembly comprises a foundation pit bottom cushion layer and a triangular support, and the foundation pit bottom cushion layer is located on the outer side of the top of the dewatering well; the precast concrete column is adopted, the slurry solidification time is shortened, the safety in the well sealing process is also ensured, and multi-section sealing is adopted in the construction process, so that the anti-seepage performance of well sealing can be greatly enhanced.

The utility model relates to the technical field of engineering construction, in particular to a device for a bottom plate pressure relief well, which comprises a vertical steel plate, a water collecting hole penetrates through the inside of the vertical steel plate, a horizontal steel plate is welded outside the vertical steel plate, and a fixing bolt is in threaded connection with the inside of the horizontal steel plate. A fixing groove is embedded in the vertical steel plate, a filtering assembly is inserted into the fixing groove, the filtering assembly comprises a filtering support, a filtering bottom plate is welded to the bottom of the filtering support, and filtering grooves are formed in the two sides of the filtering support. According to the improved device for the bottom plate pressure relief well, the inserted filtering assembly is additionally arranged in the device to filter water, it is avoided that too many impurities in the pressure relief well influence normal work of a water suction pump, the engineering construction effect is improved, meanwhile, expansion type anchor bolts in threaded connection are additionally arranged in a horizontal steel plate outside the device to fix the whole device, and the practicability is high. The pressure relief well can be conveniently subjected to pumping and drainage operation, and the engineering construction efficiency is improved.

The invention discloses a relief well and a construction method, and relates to the technical field of anti-floating of underground engineering, the relief well is arranged in a drilled well hole, and the relief well comprises a first shaft, a second shaft, a third shaft and a fourth shaft, the second shaft is arranged in the area, corresponding to the aquifer, in the well hole, and the second shaft is of a permeable structure; the bottom plate is arranged at the bottom of the well hole; the well shoe is arranged at the bottom of the well hole and can limit floating of the bottom plate; the first damping support is vertically arranged between the first shaft and the second shaft, one end of the first damping support is connected to the first shaft, the other end of the first damping support is connected to the second shaft, and a gap is formed between the first shaft and the second shaft, so that the first shaft and the second shaft can relatively move in a resettable mode in the vertical direction; and the second damping support is transversely arranged between the first shaft and the second shaft, so that the first shaft and the second shaft can relatively displace in the horizontal direction in a resettable manner. The structure can improve the shock resistance of the relief well.