CN113186994A - Method for monitoring confined water inrush during excavation of ultra-large and ultra-deep foundation pit - Google Patents
Method for monitoring confined water inrush during excavation of ultra-large and ultra-deep foundation pit Download PDFInfo
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- CN113186994A CN113186994A CN202110410584.XA CN202110410584A CN113186994A CN 113186994 A CN113186994 A CN 113186994A CN 202110410584 A CN202110410584 A CN 202110410584A CN 113186994 A CN113186994 A CN 113186994A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
Abstract
A method for monitoring confined water inrush in excavation of an ultra-large and ultra-deep foundation pit comprises the following steps: step 1, drilling a hole in a foundation pit; step 2, fixing and laying the device; step 3, fixing the drain pipe; step 4, measuring confined water; step 5, disposing of the drained water; and 6, measuring the deformation value of the pit bottom bulge of the foundation pit. The invention not only can realize intelligent monitoring of confined water and accurate arrival of stratum containing confined water, but also can realize measurement of the heave value of the deep foundation pit, and has the advantages of simple operation, low manufacturing cost, intellectualization and the like.
Description
Technical Field
The invention belongs to the technical field of foundation pit engineering monitoring, and relates to a method for monitoring confined water inrush in ultra-large and ultra-deep foundation pit excavation, which is suitable for monitoring confined water inrush in foundation pit excavation strata.
Background
The coastal areas have the conditions of abundant underground water, complex foundation soil layer, weak permeable layer and the like, and can contain confined water in the soil layer in the construction process of excavating the ultra-large and ultra-deep foundation pit, and the problems of uplift and instability of the bottom of the foundation pit can be caused by the confined water, so that the coastal areas are one of major risk sources of deep foundation pit engineering.
At present, in order to ensure the safety in the process of excavating a deep foundation pit, a first scheme is that a waterproof curtain is inserted into a waterproof layer below a confined water aquifer to cut off the confined water; the second scheme is that the precipitation well is squeezed into before the construction, progressively reduces the flood peak height of confined water along with the further excavation of foundation ditch to guarantee the safety of deep basal pit excavation process, nevertheless if the foundation ditch excavation degree of depth is great, when the confined water aquifer is more complicated, the deep basal pit excavation causes the condition that the confined water gushes suddenly still takes place occasionally, consequently if lay confined water intelligent monitoring device before the deep basal pit excavation has important meaning. When confined water suddenly gushes in the deep foundation pit, the pressure of the confined water head cannot be borne by the dead weight pressure of the overlying soil layer, so that underground water gushes into the deep foundation pit, the construction difficulty and the construction procedures can be increased, the construction period is prolonged, and the construction cost is increased. The existing device for bearing water gushing has the following two problems: firstly, the pressure change of the confined water cannot be judged through a device, and can only be solved through precipitation; and secondly, the sudden surge caused by confined water can cause the bulge of the pit bottom of the foundation pit, and no equipment is used for measuring the change of the bulge value of the pit bottom at present.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the device and the method for monitoring the confined water inrush in the excavation of the ultra-large and ultra-deep foundation pit, which not only can realize intelligent monitoring of the confined water and accurate arrival of the confined water in the stratum containing the confined water, but also can realize measurement of the pit bottom heave value of the deep foundation pit, and have the advantages of simple operation, low manufacturing cost, intellectualization and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for monitoring confined water inrush in excavation of an ultra-large and ultra-deep foundation pit comprises the following steps:
Drilling a plurality of holes in the foundation pit by using a drilling machine, arranging a retaining wall, inserting PVC pipes with equal diameters to the bottom end of the drilled hole and bearing a water layer, filling clay in the outer ends of the PVC pipes to prevent the PVC pipes from inclining, and drilling a plurality of holes according to the size of the foundation pit;
The lower end of the central position of the fixed support is connected with the upper end of a sleeve through a chain, an intelligent device for monitoring the confined water inrush of the ultra-large and ultra-deep foundation pit is sleeved in the sleeve, and a plurality of groups of rollers are arranged at the left lower end and the right lower end of the fixed support, so that the intelligent device for monitoring the confined water inrush of the ultra-large and ultra-deep foundation pit can move freely;
The top cover is arranged at the lower end of the sleeve and is in a cylindrical hole shape, the top cover is arranged at the left end and the right end of the drain pipe, the middle hole is used for inserting the drain pipe, the diameter of the hole can be determined according to the diameter of the drain pipe, the lower end of the top cover is connected with the box shell in a welding mode and is used for fixing the position of the lower end of the drain pipe, and the drain pipe is prevented from falling off when pressure-bearing water is discharged;
When the intelligent device for monitoring the sudden surge of the confined water of the ultra-large ultra-deep foundation pit is placed to the PVC pipe through the chain, the operation of other parts can be carried out, the middle part of the bottom end of the device is provided with a pipeline ball valve, two ends of the pipeline ball valve are provided with a fixer, the lower end of the pipeline ball valve is provided with a splayed notch, the confined water flows into a channel through the notch, a filter screen is arranged in the channel, when the confined water flows into the device and reaches a certain value, the ball in the pipeline ball valve is pushed to move, so that the confined water passes through the channel, the upper end of the pipeline ball valve is provided with a water pressure sensor, the value of the water pressure sensor is measured, when the confined water flows into a confined water cavity through the channel, the upper part in the confined water cavity is provided with three small ball valves, the side edges of the small ball valves are provided with three pressure sensors for checking the, when the pressure of the pressure-bearing water is sufficiently large, four sliding block ball valves are arranged around the bottom end of the device and are arranged at 90 degrees, the pressure-bearing water flows into the pressure-bearing water chamber from the sliding block ball valves, when the pressure of a pressure-bearing water head in the pressure-bearing water chamber is sufficiently large, the pressure-bearing water can slide upwards through a sliding plate on a rolling ring, a sliding plate ball valve is arranged at the right end of the sliding plate, the pressure-bearing water flows into a water storage chamber through a hose, a channel pressure sensor is arranged at the right end of the hose and is used for monitoring the total pressure value of the pressure-bearing water, when the sliding plate slides upwards to the top end, a contact of the touch pressure sensor can touch the end face of the sliding plate, the touch pressure sensor is connected with a pressure gauge of a ground surface, and an operator can see the pressure value of the pressure-bearing water through the pressure gauge;
After pressure-bearing water flows into the water storage chamber, water is pumped through a water pump at the upper end of the water storage chamber, the lower end of the water pump is fixed by a base plate, the base plate is welded with the upper end of the water storage chamber, the water pump is connected with a power supply controller through a multi-core conducting wire, the pressure-bearing water is discharged through a water discharge pipe and finally reaches a sedimentation tank, and the pressure-bearing water in the sedimentation tank can be treated according to conditions;
Arrange four survey deformation meters around monitoring super large ultra-deep foundation ditch confined water gushes intelligent device, the upper end is equipped with the telescopic link end cover, be equipped with the gear in the telescopic link end cover and be connected with the drilling rod motor, the lower extreme and the telescopic link of telescopic link end cover are connected, survey the deformation meter and pass through the drilling rod motor and be connected with the multicore conduction line, can reach appointed measurement position, the lower extreme and the spring coupling of telescopic link, a little deflection for surveying the deformation meter, be equipped with a displacement sensor around it, be connected with the display screen through the multicore conduction line, operating personnel observes the size of deformation value through the display screen.
The invention has the following beneficial effects:
(1) and (6) accurate positioning. Because the multistage pressure sensor is adopted, the pressure sensor is connected with the ball valve through the multi-core conducting wire, the pressure change of the confined water is tested, the lower end of the telescopic rod is connected with the spring in a welding mode, the lower end of the spring is bonded with the measuring deformer, the bottom end of the measuring deformer is in contact with the soil inside the foundation pit, the telescopic rod can be adjusted by the aid of the drill rod motor in real time, and the accurate reaching of the measuring position is guaranteed.
(2) The cost is low. Compared with common monitoring equipment, the device does not need to be arranged in a plurality of directions, is small in size, can complete monitoring of the deep foundation pit confined water inrush by arranging a small amount of devices, and is economical and practical.
(3) The operation is simple, safe and convenient. The operator can carry out the operation through the training of the related technical personnel and the operation method of the reading device; and personnel are not needed to observe the change of the confined water in the PVC pipe, so that unsafe factors of confined water surge are eliminated.
Drawings
Fig. 1 is a front view of a device for monitoring confined water inrush in excavation of an ultra-large and ultra-deep foundation pit.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a floor plan of a foundation pit.
Fig. 4 is a cross-sectional view a-a of fig. 1.
Fig. 5 is a cross-sectional view of B-B of fig. 1.
Fig. 6 is a cross-sectional view of C-C of fig. 1.
Fig. 7 is a cross-sectional view of D-D of fig. 1.
Fig. 8 is a cross-sectional view of E-E of fig. 1.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1-8, a method for monitoring confined water gushing during excavation of an oversized ultra-deep foundation pit, wherein a precipitation well is adopted for precipitation of a deep foundation pit, a sand-free concrete pipe with the diameter of phi 400mm is adopted, and 155 ports and 8 observation wells outside the foundation pit are arranged inside the foundation pit and the depth is 17 meters. The soil layer of the engineering is complex and is positioned in the city center, and because the dewatering wells are shallow, a large number of dewatering wells are required to be arranged to ensure the safety in the excavation process of the deep foundation pit, and the engineering has the defects of incapability of accurately positioning, long construction period and high required cost. The intelligent device for monitoring the confined water inrush during excavation of the ultra-large and ultra-deep foundation pit can realize the requirements of quick positioning, real-time intelligent monitoring and quick drainage; the method comprises the following steps:
According to the engineering, an intelligent device for monitoring confined water inrush during excavation of the ultra-large and ultra-deep foundation pit is provided, a drilling machine is used for drilling a plurality of holes in the foundation pit, a protective wall is arranged, PVC pipes 3 with equal diameters are inserted into the bottom end of the drilled hole, the outer ends of the PVC pipes 3 are filled with clay to prevent the PVC pipes 3 from inclining, and a plurality of holes can be drilled according to the size of the foundation pit.
The central point of fixed bolster 31 puts the lower extreme and sleeve 27's upper end adopts the chain to be connected, sleeve 27 endotheca has the monitoring super large ultra-deep foundation ditch confined water to gush the intelligent device suddenly, and be equipped with the multiunit gyro wheel at the left lower extreme and the right lower extreme of fixed bolster 31, can realize monitoring the arbitrary removal that super large ultra-deep foundation ditch confined water gushes the intelligent device suddenly, then put into the monitoring super large ultra-deep foundation ditch confined water gushes the intelligent device suddenly and predetermine 3 interior to the bottom of drilling of PVC pipe, according to the hole number of drilling, can lay a plurality of intelligent device.
The lower end of the sleeve 27 is provided with the top cover 4 which is in a cylindrical hole shape and is arranged at the left end and the right end of the drain pipe 28, the middle hole is used for inserting the drain pipe 28, the diameter of the hole can be determined according to the diameter of the drain pipe, the lower end of the top cover 4 is welded with the box shell and is used for fixing the position of the lower end of the drain pipe 28, and the drain pipe 28 is prevented from falling off when pressure-bearing water is discharged.
When the intelligent device for monitoring the sudden surge of the confined water of the ultra-large and ultra-deep foundation pit is placed to the bottom of the PVC pipe 3 through a chain, the operation of other parts can be carried out, the middle part of the bottom end of the device is provided with a pipeline ball valve 12, two ends of the pipeline ball valve 12 are provided with a fixer 13, the lower end of the pipeline ball valve is provided with a splayed notch, the confined water flows into a channel through the notch, a filter screen is arranged in the channel, when the confined water flows into the channel and reaches a certain value, the ball in the pipeline ball valve 12 is pushed to move, so that the confined water passes through the channel, the upper end of the pipeline ball valve 13 is provided with a water pressure sensor 14, the value of the water pressure sensor 14 is measured, when the confined water flows into the confined water chamber 10 through the channel, the upper part in the confined water chamber 10 is provided with three small ball valves 11, the side edges of the small ball valves 11 are provided with three pressure sensors, when the pressure of the confined water is enough, four sliding block ball valves 15 are arranged around the bottom end of the device and are arranged at 90 degrees, the confined water flows into the confined water chamber 10 from the sliding block ball valves 15, when the pressure of the confined water in the confined water chamber is enough, the confined water slides upwards through a sliding plate 18 on a rolling ring 17, a sliding plate ball valve 16 is arranged at the right end of the sliding plate 18, the confined water flows into a water storage chamber 25 through a hose 20, a channel pressure sensor 19 is arranged at the right end of the hose 20 and is used for monitoring the total pressure value of the confined water, when the sliding plate 18 slides upwards to the top end, a contact of the touch pressure sensor 21 touches the end surface of the sliding plate 18, and a pressure gauge 29 (the pressure gauge 29 is connected with the touch pressure sensor 21 through a multi-core conducting wire) of the ground surface is connected with the touch pressure sensor 21, the operator sees the pressure value of the pressurized water through the pressure gauge 29.
After the pressure-bearing water flows into the water storage chamber 25, the water is pumped by the water pump 8 at the upper end of the water storage chamber, the lower end of the water pump 8 is fixed by the backing plate 9, the backing plate 9 is welded to the upper end of the water storage chamber 25, the water pump 8 is connected with the power supply controller 2 through the multi-core conducting wire, the pressure-bearing water is discharged through the water discharge pipe 28 and finally reaches the sedimentation tank 30, and the pressure-bearing water in the sedimentation tank 30 can be treated according to the condition.
Arrange four survey deformation meters 22 around monitoring super large ultra-deep foundation ditch confined water gushes intelligent device, the upper end is equipped with telescopic link end cover 6, be equipped with the gear in the telescopic link end cover 6 and be connected with drilling rod motor 5 (locate top cap 4's both ends), the lower extreme and the telescopic link 7 of telescopic link end cover 6 are connected, survey deformation meter 22 and pass through drilling rod motor 5 and multicore conduction line connection and can reach appointed measurement position, the lower extreme and the spring 23 of telescopic link 7 are connected, a little deflection for surveying deformation meter 22, be equipped with a displacement sensor 24 around it, be connected with display screen 1 through multicore conduction line, operating personnel observes the size of deformation value through display screen 1.
The device for monitoring the gushing of the confined water during excavation of the ultra-large and ultra-deep foundation pit comprises a display screen 1, a power supply controller 2, a PVC pipe 3, a top cover 4, a drill rod motor 5, an expansion rod end cover 6, an expansion rod 7, a water pump 8, a backing plate 9, a confined water chamber 10, a small ball valve 11, a pipeline ball valve 12, a fixer 13, a water pressure sensor 14, a slider ball valve 15, a sliding plate ball valve 16, a rolling ring 17, a sliding plate 18, a channel pressure sensor 19, a hose 20, a touch pressure sensor 21, a deformation measuring meter 22, a spring 23, a displacement sensor 24, a water storage chamber 25, a box shell 26, a sleeve 27, a drain pipe 28, a pressure gauge 29, a sedimentation tank 30, a fixed support 31 and a protective wall 32;
the display screen 1 is positioned at the upper end of the power supply controller 2, the right end of the display screen is connected with the power supply controller 2 through a multi-core conducting wire, and the change of the pit bottom bump value can be seen through the display screen 2;
the power supply controller 2 is rectangular, and a plurality of buttons are arranged on the end face of the power supply controller and used for controlling the power supply of the drill rod motor 5, the water pump 8, the small ball valve 11, the pipeline ball valve 12, the water pressure sensor 14, the slide block ball valve 15, the slide plate ball valve 16, the channel pressure sensor 19, the touch pressure sensor 21, the deformation measuring meter 22 and the displacement sensor 24 to be started and closed;
the PVC pipe 3 is positioned in the foundation pit, is made of plastic and is used for enabling the device to be sleeved into the PVC pipe 3 to monitor the change value of the confined water and the change value of the pit bottom heave;
the top cover 4 is positioned below the sleeve 27, and the lower end of the top cover is connected with the box shell 26 in a welding mode and used for fixing the lower end of the drain pipe 28;
the drill rod motors 5 are positioned at the outer ends of the top covers 4, 4 drill rod motors are arranged totally, one ends of the drill rod motors are connected with the top covers 4 in a welding mode, and the lower ends of the drill rod motors are connected with the box shells 26 in a welding mode and used for stretching the telescopic rods 7;
the telescopic rod end cover 6 is positioned at the upper end of the telescopic rod 7 and plays a role in water prevention and dust prevention;
the telescopic rods 7 are positioned below the telescopic rod end covers 6, the lower ends of the telescopic rods are hinged with the springs 23, the telescopic rods are arranged around the box shell 26, and the number of the telescopic rods is totally 4, and the telescopic rods are used for measuring the extension and retraction of the strain gauges 22;
the water suction pump 8 is positioned inside the box shell 26, the left end of the water suction pump is connected with the water discharge pipe 28, and the lower end of the water suction pump is connected with the backing plate 9 in a welding mode and used for pumping out pressure-bearing water;
the backing plate 9 is positioned below the water suction pump 8 and used for fixing the water suction pump 8;
a pressure water chamber 10 located below the sliding plate 18 and used for storing pressure water and reaching the water storage chamber 25 through a hose 20;
the small ball valves 11 are positioned at the lower ends of the pressure-bearing water chambers 9, are provided with three small ball valves which are respectively arranged at two ends and the middle position of the pressure-bearing water chambers and are used for observing the change of pressure values under the condition of small pressure through the opening sizes of the small ball valves 11;
the pipeline ball valve 12 is positioned in the center of the splayed notch at the bottom of the device, and two ends of the pipeline ball valve are welded with the fixator 13 and used for observing the change of pressure values under the condition of small pressure through the size of an opening of the pipeline ball valve 12;
the fixer 13 is used for fixing the pipeline ball valve 12 and preventing the pipeline ball valve 12 from moving up and down;
the water pressure sensor 14 is positioned at the upper end of the pipeline ball valve 12, is sleeved with the pipeline and is used for monitoring the pressure value of the confined water in the pipeline;
the sliding block ball valve 15 is positioned around the pressure-bearing water chamber 10, is provided with 4 sliding block ball valves and is used for observing the change of pressure value under the condition of large pressure through the size of an opening of the sliding block ball valve 15;
a sliding plate ball valve 16, which is positioned at the right end of the sliding plate 18, the lower end of which is connected with the pressure-bearing water chamber 10 and is used for monitoring the pressure change value of the pressure-bearing water in the pressure-bearing water chamber;
a rolling ring 17 positioned at the outer end of the sliding plate 18, and the sliding plate 18 moves up and down through the balls in the rolling ring 17;
a slide plate 18 which is moved by the change of the pressure-bearing water chamber 10 to contact the touch pressure sensor 21 of the upper end;
the channel pressure sensor 19 is positioned at the upper end of the sliding plate 18, the left end of the channel pressure sensor is connected with the hose 20, and the lower end of the channel pressure sensor is connected with the sliding plate 18 in a welding mode and used for monitoring the pressure change value of the pressure-bearing water in the hose 20;
a hose 20 located at a middle position between the slide plate 18 and the water storage chamber 25, for allowing the pressure-bearing water in the pressure-bearing water chamber 10 to flow into the water storage chamber 25 through the hose 20;
the touch pressure sensor 21 is positioned at the left upper end of the rolling ring 17 and is used for moving upwards through the sliding plate 18 to touch the touch pressure sensor 21 at the upper end, the right end of the touch pressure sensor 21 is connected with the pressure gauge 29 through a multi-core conducting wire, and an operator can see the pressure change value of the pressure-bearing water through the pressure gauge 29 on the ground;
the deformation measuring meter 22 is positioned at the lower end of the spring 23, is connected with the spring 23 in a welding mode and is used for measuring the change of the pit bottom bump value;
a spring 23 for measuring the expansion and contraction of the strain gauge 22;
a displacement sensor 24 positioned at the middle part of the telescopic rod 7 and the strain gauge 22 to enable the strain gauge 22 to reach the position of the pit bottom;
a water storage chamber 25, the lower end of which is connected with the hose 20 and the upper end of which is connected with a drain pipe 28, for storing pressure-bearing water;
the box shell 26 is positioned at the upper part of the device and plays a role in protection, so that all parts in the device are placed in a foundation pit to be damaged;
the sleeve 27, the sleeve 27 is welded with the box shell 26, so that the device is lowered into the foundation pit through the sleeve 27;
a drain pipe 28 having a lower end connected to the water storage chamber 25 and a right end connected to the sedimentation tank 30 for discharging the pressure-bearing water through the drain pipe 28;
a pressure gauge 29, wherein an operator sees the pressure value of the bearing water through the change of the pressure gauge 29;
the settling tank 30 is connected at the left side thereof to the drain pipe 28 for settling and then pumping out after a certain time after the pressure-bearing water is drained to the settling tank 30 so as not to pollute the surrounding environment.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (3)
1. A method for monitoring confined water inrush in excavation of an ultra-large and ultra-deep foundation pit is characterized by comprising the following steps:
step 1, drilling holes in foundation pits
Drilling a plurality of holes in the foundation pit by using a drilling machine, arranging a retaining wall, inserting PVC pipes with equal diameters to the bottom end of the drilled hole to enter a pressure-bearing water layer, filling clay at the outer ends of the PVC pipes to prevent the PVC pipes from inclining, and drilling a plurality of holes according to the size of the foundation pit;
step 2, fixing and laying of the device
The lower end of the central position of the fixed support is connected with the upper end of a sleeve through a chain, an intelligent device for monitoring the confined water inrush of the ultra-large and ultra-deep foundation pit is sleeved in the sleeve, and a plurality of groups of rollers are arranged at the left lower end and the right lower end of the fixed support, so that the intelligent device for monitoring the confined water inrush of the ultra-large and ultra-deep foundation pit can move freely;
step 3, fixing the drain pipe
The top cover is arranged at the lower end of the sleeve and is in a cylindrical hole shape, the top cover is arranged at the left end and the right end of the drain pipe, the middle hole is used for inserting the drain pipe, the diameter of the hole can be determined according to the diameter of the drain pipe, the lower end of the top cover is connected with the box shell in a welding mode and is used for fixing the position of the lower end of the drain pipe, and the drain pipe is prevented from falling off when pressure-bearing water is discharged;
step 4, measuring confined water
When the intelligent device for monitoring the sudden surge of the confined water of the ultra-large ultra-deep foundation pit is placed to the bottom of the PVC pipe through the chain, the operation of other parts can be carried out, the middle part of the bottom end of the intelligent device is provided with a pipeline ball valve, two ends of the pipeline ball valve are provided with a fixer, the lower end of the pipeline ball valve is provided with a splayed notch, the confined water flows into a channel through the notch, a filter screen is arranged in the channel, when the confined water flows into the device and reaches a certain value, the ball in the pipeline ball valve is pushed to move, so that the confined water passes through the channel, the upper end of the pipeline ball valve is provided with a water pressure sensor, the value of the water pressure sensor is measured, when the confined water flows into a confined water cavity through the channel, the upper part in the confined water cavity is provided with three small ball valves, the side edges of the small ball valves are provided with three pressure sensors for checking the accuracy of the confined water value, when the pressure of the pressure-bearing water is sufficiently large, four sliding block ball valves are arranged around the bottom end of the device and are arranged at 90 degrees, the pressure-bearing water flows into the pressure-bearing water chamber from the sliding block ball valves, when the pressure of a pressure-bearing water head in the pressure-bearing water chamber is sufficiently large, the pressure-bearing water can slide upwards through a sliding plate on a rolling ring, a sliding plate ball valve is arranged at the right end of the sliding plate, the pressure-bearing water flows into a water storage chamber through a hose, a channel pressure sensor is arranged at the right end of the hose and is used for monitoring the total pressure value of the pressure-bearing water, when the sliding plate slides upwards to the top end, a contact of the touch pressure sensor can touch the end face of the sliding plate, the touch pressure sensor is connected with a pressure gauge of a ground surface, and an operator;
step 5, disposing of the wastewater
After pressure-bearing water flows into the water storage chamber, water is pumped through a water pump at the upper end of the water storage chamber, the lower end of the water pump is fixed by a base plate, the base plate is welded with the upper end of the water storage chamber, the water pump is connected with a power supply controller through a multi-core conducting wire, the pressure-bearing water is discharged through a water discharge pipe and finally reaches a sedimentation tank, and the pressure-bearing water in the sedimentation tank can be treated according to conditions;
step 6, measuring the deformation value of the pit bottom bulge of the foundation pit
Arrange four survey deformation meters around monitoring super large ultra-deep foundation ditch confined water gushes intelligent device, the upper end is equipped with the telescopic link end cover, be equipped with the gear in the telescopic link end cover and be connected with the drilling rod motor, the lower extreme and the telescopic link of telescopic link end cover are connected, survey the deformation meter and pass through the drilling rod motor and be connected with the multicore conduction line, can reach appointed measurement position, the lower extreme and the spring coupling of telescopic link, a little deflection for surveying the deformation meter, be equipped with a displacement sensor around it, be connected with the display screen through the multicore conduction line, operating personnel observes the size of deformation value through the display screen.
2. The method for monitoring the confined water burst for the excavation of the ultra-large ultra-deep foundation pit according to claim 1, wherein the device for monitoring the confined water burst for the excavation of the ultra-large ultra-deep foundation pit, which realizes the method, comprises a display screen, a power controller, a PVC pipe, a top cover, a drill pipe motor, a telescopic rod end cover, a telescopic rod, a water pump, a base plate, a confined water chamber, a small ball valve, a pipeline ball valve, a fixer, a water pressure sensor, a slider ball valve, a sliding plate ball valve, a rolling ring, a sliding plate, a channel pressure sensor, a hose, a touch pressure sensor, a deformer, a spring, a displacement sensor, a water storage chamber, a box shell, a sleeve, a drain pipe, a pressure gauge, a sedimentation tank, a fixed support and a retaining wall;
the PVC pipe is positioned in the foundation pit, and the device is sleeved into the PVC pipe through the fixed support and the sleeve to monitor the change value of the confined water; the top cover is positioned below the sleeve, and the lower end of the top cover is connected with the box shell in a welding mode and used for fixing the lower end of the drain pipe; the drill rod motor is positioned at the outer end of the top cover, one end of the drill rod motor is welded with the top cover, and the lower end of the drill rod motor is welded with the box shell and used for stretching the telescopic rod; the telescopic rod end cover is positioned at the upper end of the telescopic rod, and the lower end of the telescopic rod is hinged with the spring and arranged on the periphery of the box shell; the water suction pump is positioned in the box shell, the left side of the water suction pump is connected with the water discharge pipe, and the lower end of the water suction pump is connected with the backing plate in a welding mode and used for pumping out confined water; the pressure-bearing water chamber is positioned below the sliding plate and reaches the water storage chamber through a hose;
the small ball valves are positioned at the lower end of the pressure-bearing water cavity, are provided with three small ball valves which are respectively arranged at two ends and the middle position of the pressure-bearing water cavity and are used for observing the change of pressure values under the condition of small pressure through the size of an opening formed by the small ball valves; the pipeline ball valve is positioned in the center of the splayed notch at the bottom of the device, and two ends of the pipeline ball valve are welded with the fixator and used for observing the change of the pressure value under the condition of small pressure through the size of an opening of the pipeline ball valve; the water pressure sensor is positioned at the upper end of the pipeline ball valve, is in sleeve connection with the pipeline and is used for monitoring the pressure value of the confined water in the pipeline; the sliding block ball valve is positioned around the pressure-bearing water chamber and used for observing the change of pressure value under the condition of high pressure through the size of an opening of the sliding block ball valve; the sliding plate ball valve is positioned at the right end of the sliding plate, and the lower end of the sliding plate ball valve is connected with the pressure-bearing water chamber and used for monitoring the pressure change value of pressure-bearing water in the pressure-bearing water chamber; the rolling ring is positioned at the outer end of the sliding plate, and the sliding plate moves up and down through balls in the rolling ring; the sliding plate pushes the sliding plate to move through the change of the pressure-bearing water chamber, so that the sliding plate is contacted with the touch pressure sensor at the upper end; the channel pressure sensor is positioned at the upper end of the sliding plate, the left side of the channel pressure sensor is connected with the hose, and the lower end of the channel pressure sensor is connected with the sliding plate in a welding manner and used for monitoring the change value of the pressure-bearing water pressure in the hose; the hose is positioned between the sliding plate and the water storage chamber, so that the pressure-bearing water in the pressure-bearing water chamber flows into the water storage chamber through the hose; the touch pressure sensor is positioned at the left upper end of the rolling ring and used for moving upwards through the sliding plate to touch the touch pressure sensor at the upper end, and the right end of the touch pressure sensor is connected with the pressure gauge through a multi-core conducting wire; the deformation measuring meter is positioned at the lower end of the spring, is connected with the spring in a welding manner and is used for measuring the pit bottom heave value; the displacement sensor is positioned in the middle of the telescopic rod and the deformation meter, so that the deformation meter reaches the position of the pit bottom;
the box shell is positioned at the upper part of the device, and the sleeve is welded with the box shell so that the device is lowered into the foundation pit through the sleeve; the lower end of the drain pipe is connected with the water storage chamber, and the right end of the drain pipe is connected with the sedimentation tank, so that the pressure-bearing water is discharged through the drain pipe; the left side of the sedimentation tank is connected with a drain pipe.
3. The method for monitoring confined water inrush in excavation of an ultra-large and ultra-deep foundation pit as claimed in claim 2, wherein the device further comprises a display screen and a power supply controller, the display screen is located at the upper end of the power supply controller, the right end of the display screen is connected with the power supply controller through a multi-core conducting wire, and the pit bottom uplift value can be seen through the display screen; the power controller is rectangular, and a plurality of buttons are arranged on the end face of the power controller and used for controlling power of a drill rod motor, a water suction pump, a small ball valve, a pipeline ball valve, a water pressure sensor, a slider ball valve, a sliding plate ball valve, a channel pressure sensor, a touch pressure sensor, a deformation gauge and a displacement sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110410584.XA CN113186994A (en) | 2021-04-14 | 2021-04-14 | Method for monitoring confined water inrush during excavation of ultra-large and ultra-deep foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960781A (en) * | 2022-05-07 | 2022-08-30 | 中国十七冶集团有限公司 | Monitoring device for confined water inrush of urban ultra-deep foundation pit and using method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960781A (en) * | 2022-05-07 | 2022-08-30 | 中国十七冶集团有限公司 | Monitoring device for confined water inrush of urban ultra-deep foundation pit and using method |
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