CN111962537A - Precipitation structure suitable for caisson and laying process thereof - Google Patents
Precipitation structure suitable for caisson and laying process thereof Download PDFInfo
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Abstract
The invention discloses a precipitation structure suitable for a caisson, which can solve the problems that underground water has micro-corrosivity to water level freezing areas in winter in severe cold and cold areas, is influenced by deicing salt, sea wind, salinized soil, is influenced by deicing salt, and concrete in a coastal environment, and has micro-corrosivity to steel bars in the concrete when immersed in water for a long time; when alternately soaking, there is weak corrosivity to the reinforcing bar in the concrete, groundwater has weak corrosivity to the steel construction, and groundwater when having little corrosivity to the concrete, foundation soil also has little corrosivity to the concrete to lead to the caisson to be beaten the problem of establishing the easy groundwater influence of in-process. The well open drainage structure comprises caisson boxes, well bores, well pipes and deep well pumps, the deep wells are located in the caisson boxes, one well bore is distributed in each caisson box, one well pipe is vertically fixed in each well bore, and the well pipe extends out of the caisson box and is connected with one deep well pump in a matching mode.
Description
Technical Field
The invention relates to the technical field of caissons, in particular to a precipitation structure suitable for a caisson and a laying process thereof.
Background
In the technical field of caissons, because the soil layer has high water content and poor structure, the influence factor is fully considered in the design and construction of the caisson, particularly in the construction process, necessary precipitation measures are taken, no pollution source exists around an investigation site, underground water has micro-corrosivity to water level freezing areas in winter in severe cold and cold regions, the water level freezing areas are influenced by deicing salt, sea wind, saline soil, the concrete in a coastal environment is influenced by deicing salt, and when the caisson is soaked in water for a long time, the concrete in the concrete has micro-corrosivity; when alternately soaking, there is weak corrosivity to the reinforcing bar in the concrete, groundwater has weak corrosivity to the steel construction, and groundwater when having little corrosivity to the concrete, foundation soil also has little corrosivity to the concrete to lead to the caisson to be beaten the influence of establishing easy groundwater of in-process.
The publication number is: the patent CN103485358B discloses a method for constructing an underground structure precipitation open caisson, which is not able to solve the problems proposed in the present application: the underground water has micro-corrosivity to concrete in a water level freezing area in winter in severe cold and cold areas, influenced by deicing salt, sea wind, salinized soil and the action of deicing salt, and in a coastal environment, and has micro-corrosivity to reinforcing steel bars in the concrete when immersed in water for a long time; when alternately soaking, there is weak corrosivity to the reinforcing bar in the concrete, groundwater has weak corrosivity to the steel construction, and groundwater when having little corrosivity to the concrete, foundation soil also has little corrosivity to the concrete to lead to the caisson to be beaten the problem of establishing the easy groundwater influence of in-process.
Disclosure of Invention
The invention aims to provide a precipitation structure suitable for a caisson and a laying process thereof, which can solve the problems that underground water has micro-corrosivity to concrete in a winter water level freezing area, an area influenced by deicing salt, sea wind, saline soil and the action of deicing salt in severe cold and cold areas, and concrete in a coastal environment, and has micro-corrosivity to steel bars in the concrete when immersed in water for a long time; when alternately soaking, there is weak corrosivity to the reinforcing bar in the concrete, groundwater has weak corrosivity to the steel construction, and groundwater when having little corrosivity to the concrete, foundation soil also has little corrosivity to the concrete to lead to the caisson to be beaten the problem of establishing the easy groundwater influence of in-process.
The purpose of the invention can be realized by the following technical scheme:
a precipitation structure suitable for caissons comprises an extrawell deep well precipitation structure arranged outside a well and an extrawell open drainage structure arranged in the well, wherein the extrawell deep well precipitation structure comprises caissons, well bores, well pipes and deep well water pumps;
the deep well dewatering structure comprises deep wells and deep well pumps, wherein each deep well is arranged on the periphery of each caisson, each deep well on the periphery of each caisson is connected with one deep well pump in a matching mode through a well pipe, and a rubber sealing ring is arranged at the joint of a motor base of each deep well pump and a well mouth.
Preferably, the precipitation area of the deep well at the periphery of each caisson is set to 300m2The depth of the deep well at the periphery of each caisson is 18m, and the precipitation depth is 14-16m。
Preferably, the deep well in the caisson has a precipitation depth of 15 m.
Preferably, the diameter of the well is 700mm, the diameter of the well pipe is 273mm, and the periphery of the gap between the well pipe and the well is uniformly provided with surrounding and filling materials.
Preferably, every two deep-well water pumps are connected into a group, and every two deep-well water pumps are provided with a vacuum pump.
A layout process suitable for caisson precipitation structures comprises the layout of deep well precipitation structures outside a well and the layout of open drainage structures inside the well, and comprises the following steps:
the method comprises the following steps: the method comprises the following steps of (1) laying a deep well dewatering structure outside a well, firstly carrying out well point measurement and positioning, digging a well mouth and installing a protecting cylinder, and cleaning the inner wall of the protecting cylinder after the protecting cylinder is installed;
secondly, each deep well is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor base of the deep well water pump and a well head, the sealing is ensured, every two deep well water pumps are connected into a group, a vacuum pump is arranged, and the vacuum pump is used for vacuumizing the deep well to increase the pressure difference between the inside and the outside of the well;
step two: the method comprises the following steps of (1) laying an open drainage structure in a well, firstly carrying out well point measurement and positioning, forming a well hole at the positioned well point by adopting a rotary drilling rig dry drilling method, starting drilling operation, wherein the drilling operation is carried out slowly and quickly, the footage is 40-50cm each time, determining whether underground is unfavorable stratum, if the drilling operation is normal after the footage is 5m, increasing the footage, controlling the footage to be 70-90cm each time, and inspecting the hole depth, the hole diameter, the hole wall verticality, the sediment thickness and the like after the formed hole reaches the designed elevation;
secondly, backfilling a bottom hole sand cushion layer, taking the melon seed slices and coarse sand as a filter material, and filling the periphery of the filter material uniformly;
then, hoisting the well pipe in the well hole, and backfilling a filter layer between the well pipe and the well hole wall;
then, washing the well, arranging a water pump below the well pipe, installing a water pumping control circuit, performing trial water pumping until normal precipitation is finished, pulling out the well pipe after precipitation is finished, and sealing the well;
then, the well pipe is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor base of the deep well water pump and the well pipe mouth, the sealing is ensured, every two deep well water pumps are connected into a group, a vacuum pump is arranged, and the pressure difference between the inside and the outside of the well is increased by vacuumizing;
step three: according to the water content of the soil layer in the well depth and caisson area, a section of filter pipe with the length of 4.0m is arranged above 0.5m at the bottom of the well, a section of filter pipe with the length of 2.0m is arranged 4.0m below the natural ground, and a water suction head of a deep well water pump is placed at the position of a sand-settling pipe at the lower opening of a draining pipe;
step four: when the earthwork is excavated, if the soil body in the box is found to be collapsible, digging a water collecting well at the position away from the blade foot, wherein the depth of the water collecting well is 1-1.5m deeper than the underground water level, and the depth of the open trench and the water collecting well is continuously deepened along with the excavation of the soil in the box; the accumulated water in the water collecting well is discharged out of the caisson by a submersible pump.
Preferably, the pile casing is made of steel pile casing, the pile casing with the depth within 2m is made of a steel plate with the thickness not less than 5mm, the pile casing with the depth within 2-4m is made of a steel plate with the thickness not less than 8mm, the thickness of each pile casing with the depth above 4m is increased by 3mm, and reinforcing rings with the thickness of 6mm and the height of 14cm are welded at the top, the middle and the bottom of the pile casing.
Preferably, the method for forming the well hole by the rotary drilling rig dry drilling method comprises the following steps: and (3) starting drilling operation, wherein the drilling speed is slow firstly and then fast, the footage is 40-50cm at each time, determining whether the underground is unfavorable stratum, if the drilling is normal after the footage is 5m, increasing the footage, controlling the footage to be 70-90cm at each time, and checking the hole depth, the hole diameter, the hole wall verticality, the deposition thickness and the like after the formed hole reaches the designed elevation.
Preferably, six evenly distributed prismatic knives are fixedly mounted on the reinforcing rings at the middle part and the bottom of the protective sleeve, two prismatic knives on the same reinforcing ring are vertically arranged along the outer wall of the protective sleeve, and two prismatic knives adjacent to the prismatic knives vertically arranged are arranged at an angle of 60 degrees with the reinforcing rings.
Preferably, each prismatic knife is of a hexahedral structure, and each surface of the prismatic knife is provided with a cutting edge with a downward pointed tip.
The invention has the beneficial effects that: the invention provides a precipitation structure which comprises an arrangementThe deep well dewatering structure comprises an outdoor deep well dewatering structure outside a well and an indoor open drainage structure arranged in the well, wherein each caisson of the indoor open drainage structure is internally provided with a well hole, a well pipe is vertically fixed in each well hole, the well pipe extends out of each caisson to be matched and connected with a deep well water pump, a rubber sealing ring is arranged at the joint of a motor base of each deep well water pump and the well pipe, the dewatering area of a deep well at the periphery of each caisson is set to be 300m2The depth of the deep well at the periphery of each caisson is 18m, and the precipitation depth is 14-16 m; the deep well water lowering structure is characterized in that a deep well peripheral deep well is arranged on the periphery of each caisson of the deep well water lowering structure outside the well, each deep well peripheral deep well is connected with a deep well water pump through a well pipe in a matching mode, a rubber sealing ring is arranged at the joint of a motor base of the deep well water pump and a well head, the water lowering depth of each deep well in the caisson is 15m, a filter pipe with the length of 4.0m is arranged above 0.5m of each well bottom, a filter pipe with the length of 2.0m is arranged 4.0m below the natural ground, melon seed pieces and coarse sand are filled in the filter pipe to serve as a filter material, and a water suction head of the deep well pump is placed at the position of the sand setting pipe at the lower opening of the water lowering pipe so as to effectively extract underground water, so that the whole water lowering structure has the advantages of.
The middle part of the pile casing and the reinforcing ring at the bottom are fixedly provided with six uniformly distributed prismatic knives, two prismatic knives on the same reinforcing ring are vertically arranged along the outer wall of the pile casing, two prismatic knives adjacent to the vertically arranged prismatic knives are arranged at an angle of 60 degrees with the reinforcing ring, each prismatic knife is of a hexahedral structure, and each surface of each prismatic knife is provided with a cutting edge with a downward point, so that the pile casing can be inserted into a soil layer by using all prismatic knives in the installation process, on one hand, the pile casing can be directly inserted into the soil layer by using the prismatic knives in the installation process to play a role in fixing and supporting and further improve the stability of the pile casing, on the other hand, the pile casing is smoother in the installation process due to the soil breaking effect of the prismatic knives, and the resistance can be effectively reduced;
in the process of arrangement of a dewatering structure of an out-of-well deep well and an in-well open drainage structure, each deep well is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor base of the deep well water pump and a well mouth, the sealing is ensured, the air leakage is prevented, every two deep well water pumps are connected into a group, a vacuum pump is arranged, and the vacuum pump is used for vacuumizing the deep well to increase the pressure difference between the inside and the outside of the well, so that the water collection speed is increased, and the dewatering effect is improved;
backfilling a sand cushion layer at the bottom of the well in the process of laying the open drainage structure in the well, taking melon seed slices and coarse sand as filter materials, and filling the draining materials uniformly around, so that the effect of dewatering is prevented from being influenced by the fact that the draining materials are partially emptied;
if the condition that the soil body in the caisson is collapsed is met during earth excavation, a water collecting well is additionally arranged at the position away from the caisson blade foot, the depth of the water collecting well is 1-1.5m deeper than the underground water level, the water collecting well is connected with a high-lift submersible pump, accumulated water in the water collecting well is discharged out of the caisson by the high-lift submersible pump, the depths of the water collecting well and an open trench are continuously deepened along with the excavation in the caisson, and therefore the stability of the whole precipitation structure is still ensured when the condition that the soil body in the caisson is collapsed is met.
The construction method combining the deep well precipitation outside the well and the open drainage inside the well comprises precipitation measures inside and outside the caisson, and the method combining the deep well precipitation outside the caisson and the open drainage inside the caisson, particularly the deep well precipitation, has the advantages of large drainage and deep water depth reduction, so that the problem that the caisson is easily influenced by underground water in the process of construction can be reduced to the minimum degree.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a plan view of a precipitation structure according to the present invention;
FIG. 2 is a schematic view of the structure of the present invention;
FIG. 3 is a process flow diagram of the precipitation configuration of the present invention;
FIG. 4 is a plan view of the casing of the present invention;
FIG. 5 is a plan view of the edge tool of the present invention
In the figure: 1. a wellbore; 2. a well pipe; 3. deep wells are arranged on the periphery of the caisson; 4. sinking a well; 5. protecting the cylinder; 6. a reinforcing ring; 7. a prism cutter; 8. a blade.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, as shown in fig. 1-2, a precipitation structure suitable for a caisson comprises an out-of-well deep well precipitation structure arranged outside a well and an in-well open drainage structure arranged inside the well, wherein the in-well open drainage structure comprises a caisson, a well bore, well pipes and a deep well water pump, a deep well 4 is arranged inside the caisson, one well bore 1 is arranged in each caisson, a well pipe 2 is vertically fixed in the well bore 1, the well pipe 2 extends out of the caisson to be matched and connected with one deep well water pump, a rubber seal ring is arranged at the connection position of a motor base of the deep well water pump and the well pipe 2, and the precipitation area of the deep well 3 at the periphery of each caisson is set to be 300m2The depth of the deep well 3 at the periphery of each caisson is 18m, and the precipitation depth is 14-16 m;
the deep well precipitation structure comprises deep wells 3 on the periphery of caissons and deep well pumps, wherein one deep well 3 on the periphery of each caisson is arranged, each deep well 3 on the periphery of each caisson is connected with one deep well pump in a matching mode through a well pipe 2, a rubber sealing ring is arranged at the joint of a motor base of each deep well pump and a well mouth, and the precipitation depth of each deep well 4 in each caisson is 15 m.
The diameter of the well hole 1 is 700mm, the diameter of the well pipe 2 is 273mm, and surrounding filling materials are uniformly arranged on the periphery of a gap between the well pipe 2 and the well hole 1.
More than 0.5m of each well bottom is provided with a filter pipe with the length of 4.0m, 4.0m below the natural ground is provided with a filter pipe with the length of 2.0m, melon seed slices and coarse sand are filled in the filter pipe to be used as filter materials, and a water suction head of a deep well pump is placed at a sand settling pipe position at the lower opening of a draining pipe so as to effectively pump underground water.
Every two deep-well water pumps are connected into a group, and every two deep-well water pumps are provided with a vacuum pump, so that the pressure difference between the inside and the outside of the well is increased through vacuumizing, and the precipitation is accelerated.
When earthwork is excavated, soil in the caisson is collapsed, a water collecting well is additionally arranged at the position away from the edge foot of the caisson, the depth of the water collecting well is 1-1.5m deeper than the underground water level, the water collecting well is connected with a high-lift submersible pump, accumulated water in the water collecting well is discharged to the outside of the caisson by the high-lift submersible pump, and the depths of the water collecting well and the open trench are continuously deepened along with the excavation of the caisson.
As shown in fig. 3-5, a layout process suitable for caisson precipitation structure, which comprises the steps of layout of deep well precipitation structure outside the well and layout of open drainage structure inside the well, and comprises the following steps:
the method comprises the following steps: the method comprises the following steps of laying a deep well dewatering structure outside a well, firstly carrying out well point measurement and positioning, digging a well mouth and installing a pile casing, wherein the pile casing is made of a steel pile casing, the pile casing with the depth within 2m is made of a steel plate with the thickness not less than 5mm, the pile casing with the depth within 2-4m is made of a steel plate with the thickness not less than 8mm, the thickness of each pile casing with the depth above 4m is increased by 3mm, reinforcing rings with the thickness of 6mm and the height of 14cm are welded at the top, the middle and the bottom of the pile casing, and the inner wall of the pile casing is cleaned after the pile casing is installed; six evenly distributed's arris sword 7 of fixed mounting on the reinforcing ring 6 of a 5 middle parts of protecting a section of thick bamboo, bottom, lie in arris sword 7 on same reinforcing ring 6 wherein two along protecting 5 outer wall vertical settings of a section of thick bamboo, be 60 settings between two arris sword 7 adjacent with the arris sword 7 of vertical setting and the reinforcing ring 6, every arris sword 7 all is hexahedron structure, and every of arris sword 7 all has sharp cutting edge 8 down.
Secondly, each deep well 4 is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor base of the deep well water pump and a well mouth, the sealing is ensured, the air leakage is prevented, every two deep well water pumps are connected into a group, a vacuum pump is arranged, the vacuum pump is used for vacuumizing the deep well 4 to increase the pressure difference between the inside and the outside of the well, so that the water collection speed is increased, and the precipitation effect is improved;
step two: the method comprises the steps of (1) laying an open drainage structure in a well, firstly carrying out well point measurement and positioning, forming a well hole 1 at the positioned well point by adopting a rotary drilling rig dry drilling method, starting drilling operation, wherein the drilling operation is carried out slowly and quickly, the footage is 40-50cm each time, determining whether underground is unfavorable stratum, if the drilling operation is normal after the footage is 5m, increasing the footage, controlling the footage to be 70-90cm each time, and checking the hole depth, the hole diameter, the hole wall verticality, the sediment thickness and the like after the formed hole reaches the designed elevation;
secondly, backfilling a bottom sand cushion layer, taking melon seed slices and coarse sand as filter materials, and filling the draining materials uniformly around to prevent the draining materials from being discharged too quickly so as to prevent the draining materials from being emptied locally to influence the dewatering effect;
then, the well pipe 2 is hoisted in the well hole 1, and a filter layer between the well pipe 2 and the wall of the well hole is backfilled;
then, washing the well, arranging a water pump below the well pipe 2, installing a water pumping control circuit, performing water trial pumping until normal precipitation is finished, pulling out the well pipe 2 after precipitation is finished, and sealing the well;
then the well pipe 2 is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor base of the deep well water pump and a well pipe opening, the sealing is ensured, the air leakage is prevented, every two deep well water pumps are connected into a group, a vacuum pump is arranged, the pressure difference between the inside and the outside of the well is increased through the vacuumizing, the water collecting speed is accelerated, and the precipitation effect is improved;
step three: according to the water content of the soil layer in the well depth and caisson area, a section of filter pipe with the length of 4.0m is arranged above 0.5m at the bottom of the well, a section of filter pipe with the length of 2.0m is arranged 4.0m below the natural ground, and a water suction head of a deep well water pump is placed at the position of a sand sediment pipe at the lower opening of a draining pipe so as to effectively pump underground water;
step four: when the earthwork is excavated, if the soil body in the box is found to be collapsible, digging a water collecting well at the position away from the blade foot, wherein the depth of the water collecting well is 1-1.5m deeper than the underground water level, and the depth of the open trench and the water collecting well is continuously deepened along with the excavation of the soil in the box; the accumulated water in the water collecting well is discharged out of the caisson by the submersible pump, and the submersible pump is a high-lift submersible pump.
When the device is used, firstly, a well point measuring and positioning structure of a deep well outside the well is arranged, a well mouth is dug, a pile casing 5 is installed, the pile casing 5 is made of a steel pile casing, the pile casing 5 with the depth within 2m is made of a steel plate with the thickness not less than 5mm, the pile casing 5 with the depth within 2-4m is made of a steel plate with the thickness not less than 8mm, the thickness of each pile casing 5 with the depth more than 4m is increased by 3mm for each 2m, reinforcing rings 6 with the thickness of 6mm and the height of 14cm are welded at the top, the middle and the bottom of the pile casing 5, six uniformly distributed prismatic cutters 7 are fixedly installed on the reinforcing rings 6 at the middle and the bottom of the pile casing 5, two prismatic cutters 7 positioned on the same reinforcing ring 6 are vertically arranged along the outer wall of the pile casing 5, an angle of 60 degrees is formed between the two prismatic cutters 7 adjacent to the vertically arranged prismatic cutters 7 and the reinforcing rings 6, and six prismatic cutters 7 are in, each surface of the edge cutter 7 is provided with a cutting edge 8 with a sharp downward edge, so that the protective cylinder 5 can be inserted into a soil layer by using all the edge cutters 7 in the installation process, on one hand, the protective cylinder 5 can be directly inserted into the soil layer by using the edge cutters 7 in the installation process to play a role in fixing and supporting, and the stability of the protective cylinder 5 is improved, on the other hand, the protective cylinder 5 is smoother in the installation process due to the soil breaking effect of the edge cutters 7, the resistance can be effectively reduced, and the inner wall of the protective cylinder 5 is cleaned after the protective cylinder 5 is installed; each deep well 4 is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor base of the deep well water pump and a well mouth, the sealing is ensured, the air leakage is prevented, every two deep well water pumps are connected into a group, a vacuum pump is arranged, the vacuum pump is used for vacuumizing the deep well 4 to increase the pressure difference between the inside and the outside of the well, so that the water collection speed is increased, and the precipitation effect is improved;
firstly, measuring and positioning well points, forming a well hole 1 at the well-positioned well point by adopting a rotary drilling rig dry drilling method, starting drilling operation, wherein the drilling operation is slow and fast, the drilling operation is started, the drilling footage is 40-50cm each time, whether underground is unfavorable stratum is confirmed, if the drilling operation is normal after the footage is 5m, the footage is increased, the drilling operation is controlled to be 70-90cm each time, after the formed hole reaches the designed elevation, the hole depth, the aperture, the perpendicularity of the hole wall, the sediment thickness and the like are checked, the progress depth of each time is recorded in the drilling process, when the drill is erected, the drill bit is forbidden to be left in the hole, after the drilling is erected, the hole opening is covered for protection, and the rotary; backfilling a bottom sand cushion layer, taking melon seed slices and coarse sand as filter materials, and filling the draining materials uniformly around to prevent the draining materials from being discharged too quickly so as to prevent the draining materials from being emptied locally to influence the dewatering effect; then, the well pipe 2 is hoisted in the well hole 1, and a filter layer between the well pipe 2 and the wall of the well hole is backfilled; then, washing the well, arranging a water pump below the well pipe 2, installing a water pumping control circuit, performing water trial pumping until normal precipitation is finished, pulling out the well pipe 2 after precipitation is finished, and sealing the well; then the well pipe 2 is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor base of the deep well water pump and a well pipe opening, the sealing is ensured, the air leakage is prevented, every two deep well water pumps are connected into a group, a vacuum pump is arranged, the pressure difference between the inside and the outside of the well is increased through the vacuumizing, the water collecting speed is accelerated, and the precipitation effect is improved;
then, according to the water content of the well depth and the soil layer of the caisson area, a section of filter pipe with the length of 4.0m is arranged above the well bottom by 0.5m, a section of filter pipe with the length of 2.0m is arranged 4.0m below the natural ground, and the water suction head of the deep well water pump is placed at the position of the sand settling pipe at the lower opening of the draining pipe so as to effectively pump the underground water; when the soil is excavated, if the soil in the box is found to be collapsible, digging a water collecting well at the position away from the blade foot, wherein the depth of the water collecting well is 1-1.5m deeper than the underground water level, and the depth of the open trench and the water collecting well is continuously deepened along with the excavation of the soil in the box; the accumulated water in the water collecting well is discharged out of the caisson by the submersible pump, and the submersible pump is a high-lift submersible pump. The deep well setting should be accomplished in the construction preparation stage, can check and accept after every installation is accomplished a well, and the settling time of two deep wells should be controlled about two days, can carry out the precipitation in advance after the deep well pump installation is checked and accepted, for the precipitation effect in the assurance hole, the precipitation time in advance before the caisson should be about 15 days, and during the caisson construction period, precipitation should go on in succession, and the precipitation degree of depth should be controlled about 0.5-1.0m below the caisson bottom, and the precipitation cycle should satisfy the design requirement.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A precipitation structure suitable for a caisson comprises an extrawell deep well precipitation structure arranged outside the well and an intradwell open drainage structure arranged in the well, and is characterized in that the intradwell open drainage structure comprises the caisson, well bores, well pipes and a deep well water pump, a deep well (4) is positioned in the caisson, one well bore (1) is arranged in each caisson, one well pipe (2) is vertically fixed in each well bore (1), the well pipe (2) extends out of the caisson and is matched and connected with one deep well water pump, and a rubber sealing ring is arranged at the joint of a motor base of the deep well water pump and the well pipe (2);
the deep well dewatering structure comprises deep wells (3) on the periphery of caissons and deep well water pumps, wherein one deep well (3) on the periphery of each caisson is arranged, each deep well (3) on the periphery of each caisson is connected with one deep well water pump in a matching mode through a well pipe (2), and a rubber sealing ring is arranged at the joint of a motor base of each deep well water pump and a well mouth.
2. The structure of claim 1, wherein the area of the deep well (3) around each caisson is set to 300m2The depth of the deep well (3) at the periphery of each caisson is 18m, and the depth of precipitation is 14-16 m.
3. A precipitation structure suitable for use in a caisson according to claim 1, characterised in that the depth of precipitation in the deep well (4) in the caisson is 15 m.
4. A precipitation structure suitable for use in a caisson according to claim 1, wherein the diameter of the wellbore (1) is 700mm, the diameter of the well casing (2) is 273mm, and wherein the space between the well casing (2) and the wellbore (1) is evenly surrounded by confining drippings.
5. A precipitation construction according to claim 1, characterised in that deep-well pumps are connected in groups of two each, and that a vacuum pump is provided for each two deep-well pumps.
6. A process for arranging precipitation structures by using the precipitation structure suitable for the caisson according to any one of claims 1 to 5, which comprises the arrangement of the precipitation structure of the deep well outside the well and the arrangement of the open drainage structure in the well, and is characterized by comprising the following specific steps:
the method comprises the following steps: the method comprises the following steps of (1) laying a deep well dewatering structure outside a well, firstly carrying out well point measurement and positioning, digging a well mouth, installing a protecting cylinder (5), and cleaning the inner wall of the protecting cylinder (5);
secondly, each deep well (4) is provided with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of a motor seat of the deep well water pump and a well head, the sealing is ensured, every two deep well water pumps are connected into a group, a vacuum pump is arranged, and the vacuum pump is used for vacuumizing the deep well (4) to increase the pressure difference between the inside and the outside of the well;
step two: the method comprises the following steps of (1) laying an open drainage structure in a well, firstly, carrying out well point measurement and positioning, and forming a well hole (1) at the positioned well point by adopting a rotary drilling rig dry drilling method;
secondly, backfilling a bottom hole sand cushion layer, taking the melon seed slices and coarse sand as a filter material, and filling the periphery of the filter material uniformly;
then, the well pipe (2) is hung in the well hole (1), and a filter layer between the well pipe (2) and the wall of the well hole is backfilled;
then, washing the well, arranging a water pump below the well pipe (2), installing a water pumping control circuit, performing water pumping test until normal precipitation is finished, pulling out the well pipe (2) after precipitation is finished, and sealing the well;
then the well pipe (2) is configured with a deep well water pump, the discharge capacity is 10 tons per hour, the lift is 38m, the rubber is filled at the joint of the motor base of the deep well water pump and the well pipe mouth, the sealing is ensured, every two deep well water pumps are connected into a group, a vacuum pump is equipped, and the pressure difference between the inside and the outside of the well is increased by vacuumizing;
step three: according to the water content of the soil layer in the well depth and caisson area, a section of filter pipe with the length of 4.0m is arranged above 0.5m at the bottom of the well, a section of filter pipe with the length of 2.0m is arranged 4.0m below the natural ground, and a water suction head of a deep well water pump is placed at the position of a sand-settling pipe at the lower opening of a draining pipe;
step four: when the earthwork is excavated, if the soil body in the box is found to be collapsible, digging a water collecting well at the position away from the blade foot, wherein the depth of the water collecting well is 1-1.5m deeper than the underground water level, and the depth of the open trench and the water collecting well is continuously deepened along with the excavation of the soil in the box; the accumulated water in the water collecting well is discharged out of the caisson by a submersible pump.
7. The laying process suitable for the caisson precipitation structure, as claimed in claim 6, wherein the pile casing (5) is made of steel pile casing, the pile casing (5) with the depth within 2m is made of steel plate with the thickness not less than 5mm, the pile casing (5) with the depth within 2-4m is made of steel plate with the thickness not less than 8mm, the thickness of each pile casing (5) with the depth above 4m is increased by 3mm, and reinforcing rings (6) with the thickness of 6mm and the height of 14cm are welded on the top, the middle and the bottom of the pile casing (5).
8. The laying process suitable for the caisson precipitation structure is characterized in that the method for forming the well hole (1) by the rotary drilling rig dry drilling method comprises the following steps: and (3) starting drilling operation, wherein the drilling speed is slow firstly and then fast, the footage is 40-50cm at each time, determining whether the underground is unfavorable stratum, if the drilling is normal after the footage is 5m, increasing the footage, controlling the footage to be 70-90cm at each time, and checking the hole depth, the hole diameter, the hole wall verticality, the deposition thickness and the like after the formed hole reaches the designed elevation.
9. The laying process suitable for the caisson precipitation structure, as claimed in claim 7, wherein six uniformly distributed prismatic knives (7) are fixedly mounted on the reinforcing rings (6) at the middle part and the bottom part of the protective cylinder (5), two prismatic knives (7) positioned on the same reinforcing ring (6) are vertically arranged along the outer wall of the protective cylinder (5), and two prismatic knives (7) adjacent to the vertically arranged prismatic knives (7) are arranged at an angle of 60 degrees with respect to the reinforcing rings (6).
10. The process for laying caisson precipitation structures, according to claim 9, wherein each prismatic knife (7) has a hexahedral structure, and each face of prismatic knife (7) has a pointed downward edge (8).
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