Slurry retaining wall implementation monitoring method and optimized circulating system thereof

Abstract

The invention discloses a slurry protection wall implementation monitoring method and an optimization circulation system thereof, and relates to the field of slurry protection walls. The density of the raw mud in the mud collecting and detecting pool is detected through a universal detecting instrument, the raw mud meeting the design index requirement directly enters the mud pump backflow pool through the backflow pipe with the diameter being 100 mm, and the qualified raw mud is input into the pile casing through the mud pump. The raw mud with the density not meeting the design index requirement enters a mud feeding flocculation basin, and polyacrylamide is added into the raw mud with the density not meeting the design index requirement in the mud feeding flocculation basin, so that the indexes of various data of the raw mud meet the design requirement of the drilling wall protection mud; the qualified raw mud enters the mud pump backflow pool and then is input into the pile casing through the mud pump, the slag stone filtered out of the mud slag stone filtering pool is manually carried away, and the qualified raw mud flowing into the pile casing again meets the wall protection requirement.

Description

Technical Field

[0001] The invention relates to the field of mud wall protection, in particular to a mud wall protection implementation monitoring method and an optimization circulation system thereof. Background Art

[0002] Mud-wall bored piles are one of the earliest and most widely used pile types. On the basis of mud-wall bored piles, variable-diameter bored piles are produced, such as bored bottom-expanded bored piles, rotary expansion piles and squeezed expansion bored piles. In the process of drilling, a large amount of sludge is often produced, but the sludge produced in different areas is also different. In some places, the suspended matter in the sludge is small, and it is impossible to form wall-protecting mud during the drilling process, which often leads to mud collapse around the walls of the borehole; in some places, the amount of silt is large, and a large amount of excess sludge is produced during the drilling process, which will pollute nearby water bodies.

[0003] The existing treatment method is to add a high-power sludge pump during the drilling process, extract the sludge slurry during the drilling process through the suction action of the sludge pump, and then transport it to the shore mud collection pit through a very long delivery pipe for natural sedimentation. The sludge water formed after sedimentation is transported to the sewage treatment plant by a sludge water transport vehicle for treatment.

[0004] In the treatment of sludge slurry, not only are more machines and equipment used, resulting in complicated procedures, but also the treatment time is long, the expenditure is large, and the cost is high. As a result, it is impossible to immediately, quickly and effectively reflow qualified original mud into the casing and meet the requirements of wall protection, which reduces the obvious wall protection effect of the original mud during the drilling process, reduces the construction quality, and also affects the drilling progress. Summary of the invention

[0005] The object of the present invention is to provide a mud wall protection implementation monitoring method and an optimized circulation system thereof to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mud wall protection implementation monitoring and optimization circulation system, comprising: a drilling rig, a casing, an optimization circulation pool, a steel cage and a perfusion catheter; the optimization circulation pool comprises a mud lifting pump, a mud slag filter pool, a mud collection and detection pool, a mud feeding flocculation pool, a mud pump return pool, a return pipe and a mud pump, the output end of the mud lifting pump is connected to the input end pipeline of the mud slag filter pool, the output end of the mud slag filter pool is respectively connected to the input end pipeline of the mud collection and detection pool and the return pipe, the output ends of the mud collection and detection pool and the return pipe are both connected to the input end pipeline of the mud pump return pool, the output end of the mud pump return pool is connected to the input end pipeline of the mud pump, the output end of the mud pump is connected to the input end pipeline of the casing, the mud output end of the casing is connected to the input end pipeline of the mud lifting pump, and the drill pipe of the drilling rig is vertically arranged in the inner cavity of the casing.

[0007] As a further solution of the present invention: the input end of the mud lifting pump is fixedly connected with a slurry suction pipe, and the input end of the slurry suction pipe is arranged in the inner cavity of the casing.

[0008] As a further solution of the present invention: the output end of the mud lifting pump is fixedly connected with a slurry discharge pipe, and the output end of the slurry discharge pipe is fixedly connected with the input end of the mud slag filter tank.

[0009] As a further solution of the present invention: four buckle fixing keys are arranged under the outer plates of the mud slag filtration tank, mud collection and detection tank, mud feeding flocculation tank and mud pump return tank; four universal wheels are connected to the wheel connecting rod, and the wheel connecting rod is disassembled and assembled through the buckle fixing keys.

[0010] As a further solution of the present invention: a filter screen is arranged in the middle of the inner cavity of the slurry-slag filter tank, and the filter screen is divided into two equal parts, one part is not perforated, and the other part is perforated, and the perforations are square meshes arranged in a 6×6 pattern. This feature can improve the filtering efficiency while preventing the mud from flowing unsmoothly.

[0011] As a further solution of the present invention: the mud slag filtration tank, mud collection and detection tank, mud feeding flocculation tank, mud pump return tank) can all be square or rectangular, and the length×width×depth of each tank can be 2000㎜~3000㎜×2000㎜~3000㎜×1500㎜~2000㎜, and the length×width×depth of each tank can be 2000㎜×2000㎜×1500㎜.

[0012] As a further solution of the present invention: when the casing is buried, its center should be aligned with the center of the pile position, and its offset should not exceed 50mm. After the casing is buried, its top should be about 0.3m above the ground, and the buried depth of the casing should not be less than 1m; the outer periphery of the lower part of the casing should be filled and compacted with clay to prevent the casing from leaking during the reverse circulation of the mud pump and collapsing the hole wall; the buried height of the casing should also meet the requirement that when the hydrostatic pressure around the hole wall is above 0.02MPa during normal construction of the drilling rig, the mud liquid level in the casing should be 2m higher than the groundwater level.

[0013] As a further solution of the present invention: the wall thickness of the cast steel conduit should not be less than 3mm, the diameter should be 200mm to 250mm, the diameter manufacturing deviation should not exceed 2mm, the segmented length of the conduit can be determined according to the process requirements, usually each section is 2.5m long, the bottom pipe length should not be less than 4m, and a double-threaded square buckle quick connector should be used; the conduit should be spliced ​​and pressure tested before entering the hole to ensure that the entire conduit is vertical after connection, the water test pressure can be 0.6Mpa to 1.0Mpa, and it will not break or leak during use; after the conduit is placed under the drilled hole, its position should be kept centered, and the lower end of the conduit should be about 0.5m away from the bottom of the hole.

[0014] As a further solution of the present invention: a protective layer of pads is provided outside the steel cage, the number of which is not less than 2 groups per section of the steel cage, the number of blocks in each group is not less than 3 and they are evenly distributed on the main bars of the same cross section.

[0015] A method for monitoring the implementation of mud wall protection comprises the following steps:

[0016] Step 1: Clear the site to create a construction platform and use a total station to lay out the lines.

[0017] Step 2: Optimize the circulation pool entry. When the drilling machine rotates and drills, a large amount of primary mud is generated. The primary mud in the casing is lifted to the mud slag filter pool by the mud lifting pump 1. After the large particles of slag and other debris with a particle size of 5mm-50mm are precipitated and collected, the primary mud flows into the mud collection and detection pool through the connecting pipe. In the mud collection and detection pool, the density of the primary mud is tested by a universal testing instrument. The primary mud that meets the design index requirements directly enters the mud pump return pool through a return pipe with a diameter of 100mm. The qualified primary mud is then The mud is pumped into the casing, and the original mud whose density cannot meet the design requirements enters the mud feeding flocculation tank. By adding polyacrylamide to the original mud whose density cannot meet the design requirements in the mud feeding flocculation tank, the indicators of various data of the original mud can meet the design requirements of the drilling wall mud. The qualified original mud enters the mud pump return pool, and then is pumped into the casing through the mud pump. The slag filtered out in the mud slag filter pool is manually transported away, and the qualified original mud that flows back into the casing meets the wall protection requirements during the drilling process.

[0018] Step three: bury the steel casing in place. The deviation between the center of the casing and the center of the pile position shall not be greater than 20MM. The top of the casing shall be 0.3-0.5MM above the ground. The inner diameter of the casing shall be 150mm to 250mm larger than the pile diameter. The height of the casing shall be not less than 1.5m. One to two overflow ports shall be set on the top of the casing. The size of the overflow port shall be appropriate to ensure smooth flow of mud during normal drilling. The casing is made of steel plate with a thickness of not less than 4mm.

[0019] Step 4: After the pile position is verified to be correct and the casing is buried in accordance with the requirements, the drilling rig can be put in place, and the equipment can be put in place flat and vertical before drilling can be carried out.

[0020] Step 5: Remove waste slurry and mud residue. The mud plays the role of protecting the wall and suspending the drilling debris in the borehole.

[0021] Step six: The fully automatic ultrasonic long hole and long slot detector monitors the hole position, hole diameter, hole shape, hole depth and inclination. After the hole reaches the designed hole depth, it can be cleaned only if it meets the requirements.

[0022] Step seven: Quality acceptance. The next process can only be carried out after acceptance.

[0023] Step 8: Make the steel cage, send the steel bars for inspection, and check the steel bar model and size of the steel cage by comparing with the design drawings. The steel cage can be lowered only after passing the acceptance. The steel cage with a length of less than 12m can be directly lifted by a single lifting point, and the steel cage with a length greater than 12m can be lifted by double lifting points. The lifting points should be set at 1 / 3 and 2 / 3 of the cage length. When lifting, the welding points of the spiral stirrups should be welded or even fully welded, and the diameter of the erected stirrups should be increased to increase the overall stiffness of the steel cage, or the steel cage should be lifted by welding. At the lifting point, dry fir wood with a diameter of 120mm to 180mm and a length of 4m to 6m is tied to increase the rigidity of the lifting point, so as to prevent the steel cage from being bent during lifting; after the steel cage is lifted off the ground, the principle of center of gravity shift is used to slide the lifting wire rope on the crane hook. When placing the steel cage, it should be lifted straight and steady, and slowly lowered toward the center of the drill hole to minimize the scratching on the hole wall. After the steel cage is lowered to the designed depth, it should be fixed on the frame on the ground to prevent it from floating up during the concrete pouring process.

[0024] Step nine; lower the perfusion catheter: the wall thickness of the catheter should not be less than 3mm, the diameter is 200mm to 250mm, the diameter manufacturing deviation should not exceed 2mm, the segmented length of the catheter is 2.5m per section, the section at the bottom of the catheter is called the bottom pipe, and the length of the bottom pipe should not be less than 4m; the catheter should be spliced ​​and pressure tested before entering the hole to ensure that the entire catheter is vertical after connection. The test water pressure can be 0.6Mpa to 1.0Mpa, and it will not break or leak during use; after the catheter is lowered into the drilled hole, its position should be kept centered, and the lower end of the catheter should be about 0.5m away from the bottom of the hole.

[0025] Step 10: Carry out the second hole cleaning by pouring catheter: After sinking the steel cage, use catheter positive circulation or pump suction reverse circulation to clean the hole, which is the second hole cleaning; the continuous hole cleaning time depends on the hole diameter, hole depth and thickness of the sediment at the bottom of the hole, generally not less than 20 minutes, and the catheter can be frequently raised or lowered during the hole cleaning process to ensure that the thickness of the sediment at the bottom of the hole is within 100mm.

[0026] Step 11: Underwater concrete pouring. Underwater concrete pouring must have good workability, and the mix ratio should be determined through experiments; the slump should be 180 to 220 mm; the cement dosage should not be less than 360 kg / m3, the sand content of underwater concrete pouring should be 40% to 50%, and medium-coarse sand should be used. Coarse aggregate can be pebbles or crushed stones, and the aggregate particle size shall not be greater than 1 / 3 of the minimum clear distance between steel bars and not greater than 40 mm. Admixtures should be added to underwater concrete pouring; the water stop used for the initial concrete pouring should have good water-isolating properties and ensure smooth discharge. The water stop should be made of spherical bladder or fine stone concrete with the same strength grade as the pile concrete; start pouring concrete When the soil is poured, the distance between the bottom of the conduit and the bottom of the hole should be 300mm to 500mm. The pouring funnel should be placed on the upper end of the conduit. Its capacity should meet the concrete reserve volume. The conduit should be buried not less than 0.8m below the concrete pouring surface at one time; during normal pouring, the depth of the conduit buried in the concrete should be 2m to 6m. It is strictly forbidden to lift the conduit out of the concrete pouring surface, and the speed of lifting the conduit should be controlled; pouring underwater concrete must be constructed continuously, and the pouring time of each pile should be controlled according to the initial setting time of the initial concrete. Faults during the pouring process should be recorded and filed; the last pouring volume should be controlled, and the over-pouring height should be 0.8m to 1.0m. After chiseling out the slurry, the concrete strength of the exposed pile top must reach the design grade.

[0027] Step 12: Piling and maintenance: After the concrete is poured into the pile, necessary protective measures should be taken for the pile head, and a special person should be arranged to sprinkle water for maintenance to ensure the quality of the pile.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. When the drilling machine rotates and drills, a large amount of primary mud is generated. The primary mud in the casing is lifted to the mud slag filter pool by the mud lifting pump. After the large particles of slag and other debris with a particle size of 5mm-50mm are precipitated and collected, the primary mud flows into the mud collection and detection pool through the connecting pipe. In the mud collection and detection pool, the density of the primary mud is tested by a universal testing instrument. The primary mud that meets the design index requirements directly enters the mud pump return pool through a return pipe with a diameter of 100mm. The qualified primary mud is then input into the casing through the mud pump. The density does not meet the design index. The original mud that meets the standard requirements enters the mud feeding flocculation tank. By adding polyacrylamide to the original mud whose density cannot meet the design index requirements in the mud feeding flocculation tank, the indicators of various data of the original mud can meet the design requirements of the drilling wall mud. After that, the qualified original mud enters the mud pump return pool, and then is input into the casing through the mud pump. The slag filtered out of the mud slag filter pool is manually transported away, and the qualified original mud that flows back into the casing meets the wall protection requirements. During the drilling process, the wall protection effect of the original mud is obvious, which improves the construction quality and protects the construction environment.

[0030] 2. Drilling, multi-section hole expansion and the first hole cleaning are an inseparable combination of construction processes. Whether between the conversion of various functions or in the operation of each process, the operation of the mud pump suction reverse circulation system does not need to be interrupted, so that the hole construction of multi-section drilled and expanded cast-in-place piles can be completed by one machine in one go, which rewrites the history of the existing technology of alternating construction by multiple machines, low construction efficiency and difficult to ensure construction quality. This has become a major innovation in the construction technology of multi-section drilled and expanded cast-in-place piles, pushing the construction technology of variable diameter cast-in-place piles to a new height. The construction method can not only ensure the quality of the piles, but also greatly improve the construction efficiency, laying a solid foundation for the promotion and application of multi-section drilled and expanded cast-in-place piles;

[0031] 3. Each process in the bored pile construction process will be inspected and accepted by the five parties, and the building materials used in the construction will be sent to the inspection department for inspection, so as to strictly control each process and material in the bored pile construction process, monitor the mud wall in real time, and improve the quality of bored piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A monitoring method for implementing mud wall protection and a construction process flow chart of an optimized circulation system of the present invention;

[0033] Figure 2 A construction flow chart of a slurry wall protection monitoring method and an optimized circulation system thereof according to the present invention;

[0034] Figure 3 A schematic diagram of a slurry wall protection implementation monitoring method and a circulation process of an optimized circulation system of the present invention;

[0035] Figure 4 A schematic diagram of a slurry wall protection implementation monitoring method and an optimized circulation system circulation flow diagram of the present invention;

[0036] Figure 5 A monitoring method for implementing mud wall protection and a detection flow chart of its optimized circulation system according to the present invention;

[0037] Figure 6 A schematic diagram of a method for monitoring the implementation of mud wall protection and a multi-section drilled and expanded cast-in-place pile structure of an optimized circulation system of the present invention; DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0040] Embodiment 1

[0041] See also Figure 1 , Figure 3 , Figure 4 and Figure 6 The present embodiment provides a mud wall protection implementation monitoring and optimization circulation system, including: a drilling rig, a casing, an optimization circulation pool, a steel cage and a perfusion catheter; the optimization circulation pool includes a mud lifting pump, a mud slag filter pool, a mud collection and detection pool, a mud feeding flocculation pool, a mud pump return pool, a return pipe and a mud pump, the output end of the mud lifting pump is connected to the input end pipeline of the mud slag filter pool, the output end of the mud slag filter pool is respectively connected to the input end pipeline of the mud collection and detection pool and the return pipe, the output ends of the mud collection and detection pool and the return pipe are both connected to the input end pipeline of the mud pump return pool, the output end of the mud pump return pool is connected to the input end pipeline of the mud pump, the output end of the mud pump is connected to the input end pipeline of the casing, the mud output end of the casing is connected to the input end pipeline of the mud lifting pump, and the drill pipe of the drilling rig is vertically arranged in the inner cavity of the casing.

[0042] In the embodiment of the present application, as an optional implementation, the input end of the mud lifting pump is fixedly connected to a slurry extraction pipe, and the input end of the slurry extraction pipe is arranged in the inner cavity of the casing.

[0043] In the embodiment of the present application, as an optional implementation, the output end of the mud lifting pump is fixedly connected to a slurry discharge pipe, and the output end of the slurry discharge pipe is fixedly connected to the input end of the mud and slag filter tank.

[0044] In an embodiment of the present application, as an optional implementation, four buckle fixing keys are arranged under the outer plates of the mud slag filtration tank, the mud collection and detection tank, the mud feeding flocculation tank and the mud pump return tank; four universal wheels are connected to the wheel connecting rod, and the wheel connecting rod is disassembled and assembled through the buckle fixing keys.

[0045] In the embodiment of the present application, as an optional implementation, a filter screen is provided in the middle of the inner cavity of the slurry-slag filter pool, and the filter screen is divided into two parts with equal areas, one part is not perforated, and the other part has filter holes, and the filter holes are square meshes arranged in a 6×6 pattern. This feature can improve the filtering efficiency while preventing the mud from flowing unsmoothly.

[0046] In the embodiment of the present application, as an optional implementation mode, the mud slag filtration tank, mud collection and detection tank, mud feeding flocculation tank, mud pump return tank) can all be square or rectangular, and the length × width × depth of each tank can be 2000㎜~3000㎜×2000㎜~3000㎜×1500㎜~2000㎜, and the length × width × depth of each tank can be 2000㎜×2000㎜×1500㎜.

[0047] In the embodiment of the present application, as an optional implementation method, when the casing is buried, its center should be aligned with the center of the pile position, and its offset should not exceed 50mm. After the casing is buried, its top should be about 0.3m above the ground, and the buried depth of the casing should not be less than 1m; the outer periphery of the lower part of the casing should be filled and compacted with clay to prevent the casing from leaking during the reverse circulation of the mud pump and collapsing the hole wall; the buried height of the casing should also meet the requirement that when the hydrostatic pressure around the hole wall is above 0.02MPa during normal construction of the drilling rig, the mud liquid level in the casing should be 2m higher than the groundwater level.

[0048] In the embodiment of the present application, as an optional implementation method, the wall thickness of the cast steel conduit should not be less than 3mm, the diameter should be 200mm to 250mm, the diameter manufacturing deviation should not exceed 2mm, the segmented length of the conduit can be determined according to the process requirements, usually each section is 2.5m long, the bottom pipe length should not be less than 4m, and a double-threaded square buckle quick connector should be used; the conduit should be spliced ​​and pressure tested before entering the hole to ensure that the entire conduit is vertical after connection, the water test pressure can be 0.6Mpa to 1.0Mpa, and it will not break or leak during use; after the conduit is placed under the drilled hole, its position should be kept centered, and the lower end of the conduit should be about 0.5m away from the bottom of the hole.

[0049] Embodiment 2

[0050] A method for monitoring the implementation of mud wall protection comprises the following steps:

[0051] Step 1: Clear the site to create a construction platform and use a total station to lay out the lines.

[0052] Step 2: Optimize the circulation pool entry. When the drilling machine rotates and drills, a large amount of primary mud is generated. The primary mud in the casing is lifted to the mud slag filter pool by the mud lifting pump 1. After the large particles of slag and other debris with a particle size of 5mm-50mm are precipitated and collected, the primary mud flows into the mud collection and detection pool through the connecting pipe. In the mud collection and detection pool, the density of the primary mud is tested by a universal testing instrument. The primary mud that meets the design index requirements directly enters the mud pump return pool through a return pipe with a diameter of 100mm. The qualified primary mud is then The mud is pumped into the casing, and the original mud whose density cannot meet the design requirements enters the mud feeding flocculation tank. By adding polyacrylamide to the original mud whose density cannot meet the design requirements in the mud feeding flocculation tank, the indicators of various data of the original mud can meet the design requirements of the drilling wall mud. The qualified original mud enters the mud pump return pool, and then is pumped into the casing through the mud pump. The slag filtered out in the mud slag filter pool is manually transported away, and the qualified original mud that flows back into the casing meets the wall protection requirements during the drilling process.

[0053] Step three: bury the steel casing in place. The deviation between the center of the casing and the center of the pile position shall not be greater than 20MM. The top of the casing shall be 0.3-0.5MM above the ground. The inner diameter of the casing shall be 150mm to 250mm larger than the pile diameter. The height of the casing shall be not less than 1.5m. One to two overflow ports shall be set on the top of the casing. The size of the overflow port shall be appropriate to ensure smooth flow of mud during normal drilling. The casing is made of steel plate with a thickness of not less than 4mm.

[0054] Step 4: After the pile position is verified to be correct and the casing is buried in accordance with the requirements, the drilling rig can be put in place, and the equipment can be put in place flat and vertical before drilling can be carried out.

[0055] Step 5: Remove waste slurry and mud residue. The mud plays the role of protecting the wall and suspending the drilling debris in the borehole.

[0056] Step six: The fully automatic ultrasonic long hole and long slot detector monitors the hole position, hole diameter, hole shape, hole depth and inclination. After the hole reaches the designed hole depth, it can be cleaned only if it meets the requirements.

[0057] Step seven: Quality acceptance. The next process can only be carried out after acceptance.

[0058] Step 8: Make the steel cage, send the steel bars for inspection, and check the steel bar model and size of the steel cage by comparing with the design drawings. The steel cage can be lowered only after passing the acceptance. The steel cage with a length of less than 12m can be directly lifted by a single lifting point, and the steel cage with a length greater than 12m can be lifted by double lifting points. The lifting points should be set at 1 / 3 and 2 / 3 of the cage length. When lifting, the welding points of the spiral stirrups should be welded or even fully welded, and the diameter of the erected stirrups should be increased to increase the overall stiffness of the steel cage, or the steel cage should be lifted by welding. At the lifting point, dry fir wood with a diameter of 120mm to 180mm and a length of 4m to 6m is tied to increase the rigidity of the lifting point, so as to prevent the steel cage from being bent during lifting; after the steel cage is lifted off the ground, the principle of center of gravity shift is used to slide the lifting wire rope on the crane hook. When placing the steel cage, it should be lifted straight and steady, and slowly lowered toward the center of the drill hole to minimize the scratching on the hole wall. After the steel cage is lowered to the designed depth, it should be fixed on the frame on the ground to prevent it from floating up during the concrete pouring process.

[0059] Step nine; lower the perfusion catheter: the wall thickness of the catheter should not be less than 3mm, the diameter is 200mm to 250mm, the diameter manufacturing deviation should not exceed 2mm, the segmented length of the catheter is 2.5m per section, the section at the bottom of the catheter is called the bottom pipe, and the length of the bottom pipe should not be less than 4m; the catheter should be spliced ​​and pressure tested before entering the hole to ensure that the entire catheter is vertical after connection. The test water pressure can be 0.6Mpa to 1.0Mpa, and it will not break or leak during use; after the catheter is lowered into the drilled hole, its position should be kept centered, and the lower end of the catheter should be about 0.5m away from the bottom of the hole.

[0060] Step 10: Carry out the second hole cleaning by pouring catheter: After sinking the steel cage, use catheter positive circulation or pump suction reverse circulation to clean the hole, which is the second hole cleaning; the continuous hole cleaning time depends on the hole diameter, hole depth and thickness of the sediment at the bottom of the hole, generally not less than 20 minutes, and the catheter can be frequently raised or lowered during the hole cleaning process to ensure that the thickness of the sediment at the bottom of the hole is within 100mm.

[0061] Step 11: Underwater concrete pouring. Underwater concrete pouring must have good workability, and the mix ratio should be determined through experiments; the slump should be 180 to 220 mm; the cement dosage should not be less than 360 kg / m3, the sand content of underwater concrete pouring should be 40% to 50%, and medium-coarse sand should be used. Coarse aggregate can be pebbles or crushed stones, and the aggregate particle size shall not be greater than 1 / 3 of the minimum clear distance between steel bars and not greater than 40 mm. Admixtures should be added to underwater concrete pouring; the water stop used for the initial concrete pouring should have good water-isolating properties and ensure smooth discharge. The water stop should be made of spherical bladder or fine stone concrete with the same strength grade as the pile concrete; start pouring concrete When the soil is poured, the distance between the bottom of the conduit and the bottom of the hole should be 300mm to 500mm. The pouring funnel should be placed on the upper end of the conduit. Its capacity should meet the concrete reserve volume. The conduit should be buried not less than 0.8m below the concrete pouring surface at one time; during normal pouring, the depth of the conduit buried in the concrete should be 2m to 6m. It is strictly forbidden to lift the conduit out of the concrete pouring surface, and the speed of lifting the conduit should be controlled; pouring underwater concrete must be constructed continuously, and the pouring time of each pile should be controlled according to the initial setting time of the initial concrete. Faults during the pouring process should be recorded and filed; the last pouring volume should be controlled, and the over-pouring height should be 0.8m to 1.0m. After chiseling out the slurry, the concrete strength of the exposed pile top must reach the design grade.

[0062] Step 12: Piling and maintenance: After the concrete is poured into the pile, necessary protective measures should be taken for the pile head, and a special person should be arranged to sprinkle water for maintenance to ensure the quality of the pile.

[0063] The working principle of the present invention is as follows: a large amount of primary mud is generated when the drilling machine rotates to drill a hole. The primary mud in the casing is lifted into the mud slag filter pool by the mud lifting pump. After the large particles of slag and other debris with a particle size of 5mm-50mm are precipitated and collected, the primary mud flows into the mud collection and detection pool through the connecting pipe. In the mud collection and detection pool, the density of the primary mud is detected by a universal detection instrument. The primary mud that meets the design index requirements directly enters the mud pump return pool through a return pipe with a diameter of 100mm. The qualified primary mud is then input into the casing through the mud pump. The primary mud whose density cannot meet the design index requirements enters the mud feeding flocculation pool. By adding polyacrylamide to the primary mud whose density cannot meet the design index requirements in the mud feeding flocculation pool, the indicators of various data of the primary mud meet the design requirements of the drilling wall mud. The qualified primary mud enters the mud pump return pool and is then input into the casing through the mud pump.

[0064] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A slurry wall protection implementation monitoring and optimization circulation system, comprising: Drilling rig, casing, optimized circulation pool, steel cage and perfusion catheter; characterized in that: the optimized circulation pool includes a mud lifting pump, a mud slag filter pool, a mud collection and detection pool, a mud feeding flocculation pool, a mud pump return pool, a return pipe and a mud pump, the output end of the mud lifting pump is connected to the input end pipeline of the mud slag filter pool, the output end of the mud slag filter pool is respectively connected to the input end pipeline of the mud collection and detection pool and the return pipe, the output ends of the mud collection and detection pool and the return pipe are both connected to the input end pipeline of the mud pump return pool, the output end of the mud pump return pool is connected to the input end pipeline of the mud pump, the output end of the mud pump is connected to the input end pipeline of the casing, the mud output end of the casing is connected to the input end pipeline of the mud lifting pump, and the drill pipe of the drilling rig is vertically arranged in the inner cavity of the casing.

2. A slurry wall protection implementation monitoring and optimization circulation system according to claim 1, characterized in that: The input end of the mud lifting pump is fixedly connected with a slurry extraction pipe, and the input end of the slurry extraction pipe is arranged in the inner cavity of the casing.

3. A slurry wall protection implementation monitoring and optimization circulation system according to claim 2, characterized in that: The output end of the mud lifting pump is fixedly connected with a slurry discharge pipe, and the output end of the slurry discharge pipe is fixedly connected with the input end of the mud slag rock filtering tank.

4. A slurry wall protection implementation monitoring and optimization circulation system according to claim 1, characterized in that: Four buckle fixing keys are arranged under the outer plates of the mud slag filter tank, the mud collection and detection tank, the mud feeding flocculation tank and the mud pump return tank; four universal wheels are connected to the wheel connecting rod, and the wheel connecting rod is disassembled and assembled through the buckle fixing keys.

5. The slurry wall protection implementation monitoring and optimization circulation system according to claim 1 is characterized in that: A filter screen is arranged in the middle of the inner cavity of the pulp and slag filter pool. The filter screen is divided into two parts with equal areas, one part is without holes and the other part has filter holes. The filter holes are square meshes arranged in 6×6. This feature improves filtration efficiency while preventing slurry flow restriction.

6. A slurry wall protection implementation monitoring and optimization circulation system according to claim 1, characterized in that: The mud slag filtration tank, mud collection and detection tank, mud feeding flocculation tank, mud pump return tank) can all be square or rectangular, and the length×width×depth of each tank can be 2000㎜~3000㎜×2000㎜~3000㎜×1500㎜~2000㎜, and the length×width×depth of each tank can be 2000㎜×2000㎜×1500㎜.

7. The slurry wall protection implementation monitoring and optimization circulation system according to claim 1 is characterized in that: When the casing is buried, its center should be aligned with the center of the pile position, and the offset should not exceed 50mm. After the casing is buried, its top should be about 0.3m above the ground, and the buried depth of the casing should not be less than 1m; the outer periphery of the lower part of the casing should be filled and compacted with clay to prevent the casing from leaking and collapsing the hole wall during the reverse circulation of the mud pump; the buried height of the casing should also meet the requirements that when the hydrostatic pressure around the hole wall is above 0.02MPa during normal construction of the drilling rig, the mud liquid level in the casing should be 2m higher than the groundwater level.

8. The slurry wall protection implementation monitoring and optimization circulation system according to claim 1 is characterized in that: The wall thickness of the cast-in-place steel conduit should not be less than 3mm, the diameter should be 200mm to 250mm, the diameter manufacturing deviation should not exceed 2mm, the segment length of the conduit can be determined according to the process requirements, usually each section is 2.5m long, the bottom pipe length should not be less than 4m, and a double-threaded square buckle quick connector should be used; the conduit should be spliced ​​and pressure tested before entering the hole to ensure that the entire conduit is vertical after connection. The test water pressure can be 0.6Mpa to 1.0Mpa, and it will not break or leak during use; after the conduit is placed under the drilled hole, its position should be kept centered, and the lower end of the conduit should be about 0.5m away from the bottom of the hole.

9. The slurry wall protection implementation monitoring and optimization circulation system according to claim 1 is characterized in that: The outside of the steel cage is provided with protective layer pads, the number of which is not less than 2 groups per section of the steel cage, and the number of blocks in each group is not less than 3 and they are evenly distributed on the main reinforcement of the same cross-section.

10. A method for monitoring a slurry wall, comprising: Step 1: The site was cleared to create a construction platform, and a total station was used to lay out the lines. Step 2: Optimize the circulation pool entry. When the drilling machine rotates and drills, a large amount of primary mud is generated. The primary mud in the casing is lifted to the mud slag filter pool by the mud lifting pump 1. After the large particles of slag and other debris with a particle size of 5mm-50mm are precipitated and collected, the primary mud flows into the mud collection and detection pool through the connecting pipe. In the mud collection and detection pool, the density of the primary mud is tested by a universal testing instrument. The primary mud that meets the design index requirements directly enters the mud pump return pool through a return pipe with a diameter of 100mm. The qualified primary mud is then The mud is pumped into the casing, and the original mud whose density cannot meet the design requirements enters the mud feeding flocculation tank. By adding polyacrylamide to the original mud whose density cannot meet the design requirements in the mud feeding flocculation tank, the indicators of various data of the original mud can meet the design requirements of the drilling wall mud. The qualified original mud enters the mud pump return pool, and then is pumped into the casing through the mud pump. The slag filtered out in the mud slag filter pool is manually transported away, and the qualified original mud that flows back into the casing meets the wall protection requirements during the drilling process. Step 3: Bury the steel casing in place, the deviation between the center of the casing and the center of the pile position shall not be greater than 20MM, the top of the casing shall be 0.3-0.5MM above the ground, the inner diameter of the casing shall be 150mm to 250mm larger than the pile diameter, the height of the casing shall be not less than 1.5m, 1 to 2 overflow ports shall be set on the top of the casing, the size of the overflow port shall be appropriate to ensure smooth flow of mud during normal drilling, and the casing is made of steel plate with a thickness of not less than 4mm. Step 4: After the pile position is verified to be correct and the casing is buried in accordance with the requirements, the drilling rig can be put in place, and the equipment can be put in place flat and vertical before drilling can be carried out. Step 5: Remove waste slurry and mud residue. The mud plays the role of protecting the wall and suspending the drilling debris in the borehole. Step six: The fully automatic ultrasonic long hole and long slot detector monitors the hole position, hole diameter, hole shape, hole depth and inclination. After the hole reaches the designed hole depth, it can be cleaned only if it meets the requirements. Step 7; Quality acceptance, the next process can only be carried out after acceptance. Step 8: Make the steel cage, send the steel bars for inspection, and check the steel bar model and size of the steel cage by comparing with the design drawings. The steel cage can be lowered only after passing the acceptance. The steel cage with a length of less than 12m can be directly lifted by a single lifting point, and the steel cage with a length greater than 12m can be lifted by double lifting points. The lifting points should be set at 1 / 3 and 2 / 3 of the cage length. When lifting, the welding points of the spiral stirrups should be welded or even fully welded, and the diameter of the erected stirrups should be increased to increase the overall stiffness of the steel cage, or the steel cage should be lifted by welding. At the lifting point, dry fir wood with a diameter of 120mm to 180mm and a length of 4m to 6m is tied to increase the rigidity of the lifting point, so as to prevent the steel cage from being bent during lifting; after the steel cage is lifted off the ground, the principle of center of gravity shift is used to slide the lifting wire rope on the crane hook. When placing the steel cage, it should be lifted straight and steady, and slowly lowered toward the center of the drill hole to minimize the scratching on the hole wall. After the steel cage is lowered to the designed depth, it should be fixed on the frame on the ground to prevent it from floating up during the concrete pouring process. Step nine; lower the perfusion catheter: the wall thickness of the catheter should not be less than 3mm, the diameter is 200mm to 250mm, the diameter manufacturing deviation should not exceed 2mm, the segmented length of the catheter is 2.5m per section, the section at the bottom of the catheter is called the bottom pipe, and the length of the bottom pipe should not be less than 4m; the catheter should be spliced ​​and pressure tested before entering the hole to ensure that the entire catheter is vertical after connection. The test water pressure can be 0.6Mpa to 1.0Mpa, and it will not break or leak during use; after the catheter is lowered into the drilled hole, its position should be kept centered, and the lower end of the catheter should be about 0.5m away from the bottom of the hole. Step 10: Carry out the second hole cleaning by pouring catheter: After sinking the steel cage, use catheter positive circulation or pump suction reverse circulation to clean the hole, which is the second hole cleaning; the continuous hole cleaning time depends on the hole diameter, hole depth and thickness of the sediment at the bottom of the hole, generally not less than 20 minutes, and the catheter can be frequently raised or lowered during the hole cleaning process to ensure that the thickness of the sediment at the bottom of the hole is within 100mm. Step 11: Underwater concrete pouring. Underwater concrete pouring must have good workability, and the mix ratio should be determined through experiments; the slump should be 180 to 220 mm; the cement dosage should not be less than 360 kg / m3; the sand content of underwater concrete pouring should be 40% to 50%, and medium-coarse sand should be used. Coarse aggregate can be pebbles or crushed stones, and the aggregate particle size should not be greater than 1 / 3 of the minimum clear distance between steel bars and not greater than 40 mm. Admixtures should be added to underwater concrete pouring; the water stopper used for the initial concrete pouring should have good Good water-blocking performance and can ensure smooth drainage. The water stopper should be made of ball bladder or fine stone concrete with the same strength grade as the pile concrete. When pouring concrete, the distance between the bottom of the conduit and the bottom of the hole should be 300mm to 500mm. The pouring funnel should be placed on the upper end of the conduit. Its capacity should meet the concrete reserve. The conduit should be buried no less than 0.8m below the concrete pouring surface at one time. During normal pouring, the depth of the conduit buried in the concrete should be 2m to 6m. It is strictly forbidden to lift the conduit out of the concrete pouring surface, and the speed of lifting the conduit should be controlled. The pouring of underwater concrete must be carried out continuously. The pouring time of each pile should be controlled according to the initial setting time of the initial concrete. Faults occurring during the pouring process should be recorded and filed. The last pouring volume should be controlled, and the over-pouring height should be 0.8m to 1.0m. After chiseling out the slurry, the concrete strength of the exposed pile top must reach the design grade. Step 12: Piling and maintenance: After the concrete is poured into the pile, necessary protective measures should be taken for the pile head, and a special person should be arranged to sprinkle water for maintenance to ensure the quality of the pile.

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