CN115559337A - Special dewatering method for construction - Google Patents
Special dewatering method for construction Download PDFInfo
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- CN115559337A CN115559337A CN202211020928.7A CN202211020928A CN115559337A CN 115559337 A CN115559337 A CN 115559337A CN 202211020928 A CN202211020928 A CN 202211020928A CN 115559337 A CN115559337 A CN 115559337A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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Abstract
The invention relates to the technical field of building construction, in particular to a special dewatering method for construction. The method comprises the following steps: step s1, measure the precipitation point position bed course top elevation of job site in order to select the precipitation scheme, step s2, use the precipitation scheme to carry out the drainage to a pair of sump pit, the drain pipe bottom is equipped with the detector and links to each other with the controller, can be to the pressure that the drain pipe bottom receives, the density of the environment of locating normal water etc. detects and makes corresponding control, step s3, use the precipitation scheme to carry out the drainage to two pairs of sump pits, wherein used the caisson, every face all connects the welding and has 8# channel-section steel all around the caisson, and every side all welds all around the caisson has the U-shaped hoop that has C14 reinforcing bar machine-shaping, vertical and horizontal interval is 300mm between every U-shaped hoop. The invention improves the efficiency of precipitation, and has good precipitation effect, thereby ensuring the construction safety and improving the engineering quality.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a special dewatering method for construction.
Background
In recent years, with the rapid development of national economy and urban construction in China, the contradiction of land resource shortage is increasingly prominent, and in order to effectively utilize land resources, the development of urban underground space and the development of high-rise and super high-rise buildings are rapid. Accordingly, deep and large foundation pit supporting and precipitation projects are gradually increased, and construction is often performed in dense building groups. In the process of excavation of the foundation pit, along with the change of load and the occurrence of foundation pit precipitation, the change of the internal stress of the soil body is changed within a certain range, and further the deformation of the building within the range is influenced. As an important component of water resources, groundwater resources have become an important component in human production, life, and social economy. How to accomplish construction precipitation fast convenient is the problem that people were very concerned about at present.
Chinese patent CN110306579A discloses a foundation pit dewatering method, which comprises: forming a hole at the bottom of the foundation pit to form a well hole for accommodating the main filter tube; receiving a primary filter tube in a wellbore; pumping water to the main filter pipe; forming a hole at the bottom of the foundation pit to form a water pumping hole for accommodating the auxiliary filter pipe; the auxiliary filter pipe is accommodated in the water pumping hole; pumping water to the auxiliary filter pipe; the diameter of the main filter pipe is larger than that of the auxiliary filter pipes, the water pumping holes are uniformly distributed around the well hole, and the auxiliary filter pipes correspond to the water pumping holes one to one. Therefore, the foundation pit precipitation method is single in precipitation mode, and corresponding precipitation measures cannot be taken according to the construction site environment, so that the precipitation efficiency is poor.
Disclosure of Invention
Therefore, the invention provides a special precipitation method for construction, which is used for overcoming the problems of single precipitation mode and poor precipitation efficiency in the prior art.
In order to achieve the purpose, the invention provides a special dewatering method for construction, which comprises the following steps:
step s1, a constructor measures the top elevation of a precipitation point position cushion layer of a construction site to select a precipitation scheme, if the top elevation of the precipitation point position cushion layer of the construction site is more than 41.7m, the constructor selects a first precipitation scheme, and if the top elevation of the precipitation point position cushion layer of the construction site is 41.7m or less, the constructor selects a second precipitation scheme;
step s2, if the first dewatering scheme is selected, a constructor drains underground open water in a water collecting pit and manually cleans the pit bottom, a water pit is dug in the center of the horizontal plane of the pit bottom of the water collecting pit, crushed stone is backfilled to serve as a water filtering layer, an outer steel wire mesh of a water discharging pipe penetrates through a steel pipe sleeve and is led to a foundation pit for water pumping and discharging, a cushion layer is poured and waterproof installation is carried out on a bottom plate after water pumping and discharging are finished, reinforcing steel bars of the bottom plate are bound, after pouring of concrete of the bottom plate is finished, the constructor cuts off a water pumping pipe, fills high-strength grouting material into the steel pipe sleeve and uses a vibrating rod to vibrate the high-strength grouting material, the steel plate is fully welded and sealed after vibration compaction, and the high-strength grouting material is poured into a reserved groove in the steel plate;
step s3, if choose for use precipitation scheme two, constructor uses the excavator to excavate the sump pit to the bed course bottom elevation and place the steel sheet caisson, and constructor keeps the caisson edge to be higher than the water level, and the steel sheet caisson is placed and is accomplished and concreting to the bottom elevation position around the constructor caisson, pours and carries out the pump drainage to ponding in the caisson after accomplishing, carries out the construction of bed course and waterproof layer after the pump drainage is accomplished.
Further, in step s2, the length, width and height of the pit dug by the constructor at the center of the horizontal plane of the bottom of the sump are all 1m.
Further, in step s2, a sewage pump is placed in the water filtering layer; the power of the sewage pump is 1.5kW.
Further, in step s2, the high-strength grouting material is a C50 grouting material; the thickness of the steel plate is 10mm.
Further, in the step s2, the bottom of the steel pipe sleeve is located at 1m of the water filtering layer at the bottom of the raft, and a hole with the diameter of 5mm is formed in the part, located on the water filtering layer, of the steel pipe sleeve; the bottom of the steel pipe sleeve and the part of the steel pipe sleeve positioned on the drainage layer are coated with a steel wire mesh; and brushing antirust paint on the steel pipe sleeve.
Further, in step s3, when the caisson is placed, a constructor ensures that the placement position of the caisson is consistent with the center position of the sump; every face all connects the welding all around the caisson has 8# channel-section steel to every side all welds all around the caisson has the U type hoop that has C14 reinforcing bar machine-shaping, and vertical and horizontal interval is 300mm between every U type hoop.
Further, in step s3, the caisson is provided with a valve, and when the caisson is placed, a constructor opens the valve to make the water in the water collecting pit flow into the caisson so that the caisson sinks slowly; the bottom of the caisson is provided with a steel pipe sleeve with the diameter of 50mm so as to discharge water in the caisson and enable the caisson to sink to the bottom; the top of the caisson is 150mm higher than the water level elevation; and after the caisson is placed, pouring C40P8 concrete around the caisson by constructors.
Further, in step s3, in step s2, when the drain pipe is led to the foundation pit, a detector arranged on the drain pipe detects water pressure P applied to the bottom of the drain pipe and compares the water pressure P with a preset value to judge whether to prompt a constructor to adjust the depth L of the drain pipe; the detector is connected with a controller, the controller comprises a display device for receiving information detected by the detector, and a constructor can operate the controller to control the depth of the drain pipe by using the display device, the controller is provided with a first preset pressure P1, a second preset pressure P2, a first regulating coefficient alpha 1 and a second regulating coefficient alpha 2, wherein P1 is more than 0 and less than P2, alpha 1 is more than 0 and less than 1 and less than alpha 2,
if P is not more than P1, the controller prompts a constructor to adjust the depth L to L 'of the drain pipe by using alpha 2, and L' = L multiplied by alpha 2 is set;
if P1 is more than P and less than or equal to P2, the controller does not need to prompt a constructor to adjust the depth of the drain pipe;
if P2 < P, the controller prompts the operator to adjust the depth L to L 'of the drain pipe using α 1, and sets L' = L × α 1.
Further, when the constructor adjusts the depth L to L 'of the drain pipe, the controller controls the detector to detect the water pressure P applied to the bottom of the drain pipe at the moment again and compares the water pressure P with a preset value to judge whether to adjust the depth L' of the drain pipe continuously, the controller calculates the adjusted depth L 'and the adjusted times N of the drain pipe when adjusting the depth of the drain pipe, the controller stops the adjusting process when the adjusted depth L' and/or the adjusted times N of the drain pipe exceed the preset value, the controller is provided with the highest adjusting times Nmax, the maximum drain pipe depth Lmax and the minimum drain pipe depth Lmin,
if L 'is more than or equal to Lmax, L' is less than or equal to Lmin or N is more than or equal to Nmax, the controller judges that the adjustment of the depth of the drain pipe is stopped;
if Lmin is less than L' < Lmax, the controller judges that the adjustment of the depth of the drain pipe is allowed;
if N < Nmax, the controller determines that adjustment of the drain depth is permitted.
Further, when the detector detects the depth of the bottom of the drain pipe, the controller compares the density Q of the water detected by the detector with a preset value to judge whether to adjust the first preset pressure P1 and the second preset pressure P2, the controller is provided with a first preset density Q1, a second preset density Q2, a first density adjusting coefficient beta 1 and a second density adjusting coefficient beta 2, wherein Q1 is more than 0 and less than Q2, beta 1 is more than 0 and less than 1 and less than beta 2,
if Q ≦ Q1, the controller determines to adjust P1 to P1 'and to adjust P2 to P2' using β 1, setting P1'= P1 × β 1, P2' = P2 × β 1;
if Q1 is larger than Q and is not larger than Q2, the controller judges that the P1 and the P2 do not need to be adjusted;
if Q2 < Q, the controller determines to adjust P1 to P1 'using β 2 and to adjust P2 to P2', setting P1'= P1 × β 2, P2' = P2 × β 2.
Compared with the prior art, the construction method has the advantages that the corresponding precipitation scheme is arranged corresponding to the top elevation of the cushion layer at the precipitation point position on the construction site, so that the material consumption in the precipitation process is saved, the whole process is simple, the precipitation efficiency is improved, the precipitation effect is good, the construction safety is ensured, and the engineering quality is improved.
Furthermore, the special precipitation method for construction is provided with a corresponding precipitation scheme corresponding to the top elevation of the cushion layer at the precipitation point position on the construction site, so that the problems of poor precipitation efficiency and material waste caused by a single precipitation mode are solved, the precipitation speed is increased, and the precipitation effect and the precipitation efficiency are further ensured.
Further, in the step s2, the sump dug at the center of the horizontal plane of the bottom of the sump is provided with the 1.5kW sewage pump, so that the problem of dry burning caused by incapability of draining accumulated water or overlarge power of the sewage pump due to uneven bottom of the sump in the construction process is solved, the safety of the construction process is ensured, the precipitation speed is improved, and the precipitation effect and the precipitation efficiency are further ensured.
Further, the high-strength grouting material used in the step s2 is C50 grouting material, so that the strength of concrete is ensured, the safety of the construction process is further ensured, the precipitation speed is increased, and the precipitation effect and the precipitation efficiency are further ensured.
Furthermore, the controller is provided with a first preset pressure and a second preset pressure, and the controller compares the P with the preset value to judge whether to prompt a constructor to adjust the depth of the drain pipe, so that the problem of poor precipitation efficiency caused by the fact that the underwater pressure does not accord with a preset standard is solved, the precipitation speed is increased, and the precipitation effect and the precipitation efficiency are further ensured.
Furthermore, the controller is provided with the maximum adjusting times, the maximum drain pipe depth and the minimum drain pipe depth, so that the problems that the adjusting times are too many and the drain pipe depth does not meet the standard are solved, the precipitation speed is improved, and the precipitation effect and the precipitation efficiency are further ensured.
Furthermore, in step s3, each surface of the periphery of the caisson is welded with 8# channel steel, each side of the periphery of the caisson is welded with a U-shaped hoop formed by machining C14 steel bars, the vertical and horizontal spacing between each U-shaped hoop is 300mm, the rigidity of the caisson is improved, deformation in the construction process is avoided, the safety of the construction process is guaranteed, the precipitation speed is improved, and the precipitation effect and the precipitation efficiency are further guaranteed.
Furthermore, in the step s3, the caisson is provided with a valve, so that the caisson is ensured to be slowly sunk to the bottom of the sump pit, the caisson is prevented from being damaged due to too high sinking speed, the safety of the construction process is ensured, the precipitation speed is improved, and the precipitation effect and the precipitation efficiency are further ensured.
Drawings
FIG. 1 is a flow chart of a process of a precipitation method dedicated for construction according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of sump precipitation prior to casting according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of sump precipitation after casting according to an embodiment of the present invention;
FIG. 4 is a sectional view of sump precipitation according to a second embodiment of the present invention;
FIG. 5 is a front view of a caisson embodiment of this invention;
fig. 6 is a top view of a caisson embodiment of this invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principles of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, which is a flowchart illustrating a procedure of a precipitation method dedicated for construction according to an embodiment of the present invention, the precipitation method dedicated for construction is characterized by comprising:
step s1, a constructor measures the top elevation of a precipitation point position cushion layer of a construction site to select a precipitation scheme, if the top elevation of the precipitation point position cushion layer of the construction site is more than 41.7m, the constructor selects a first precipitation scheme, and if the top elevation of the precipitation point position cushion layer of the construction site is 41.7m or less, the constructor selects a second precipitation scheme;
step s2, if the first dewatering scheme is selected, construction personnel dry underground open water in the water collecting pit and manually clean the pit bottom, a water pit is dug in the center of the horizontal plane of the pit bottom of the water collecting pit, broken stones are backfilled to serve as a water filtering layer, an outer steel wire mesh wrapped outside a water draining pipe penetrates into a steel pipe sleeve to be led to a foundation pit to conduct water pumping and draining, a cushion layer is poured and waterproof installation is conducted on a bottom plate after the water pumping and draining is completed, reinforcing steel bars of the bottom plate are bound, after pouring of concrete of the bottom plate is completed, the construction personnel cut off a water pumping pipe, pour high-strength grouting materials into the steel pipe sleeve and use a vibrating rod to vibrate the high-strength grouting materials, the steel plate is sealed in a full welding mode when the vibration is dense, and the high-strength grouting materials are poured into reserved grooves in the steel plate;
step s3, if choose for use precipitation scheme two, constructor uses the excavator to excavate the sump pit to the bed course bottom elevation and place the steel sheet caisson, and constructor keeps the caisson edge to be higher than the water level, and the steel sheet caisson is placed and is accomplished and concreting to the bottom elevation position around the constructor caisson, pours and carries out the pump drainage to ponding in the caisson after accomplishing, carries out the construction of bed course and waterproof layer after the pump drainage is accomplished.
Referring to fig. 2, which is a sectional view of a sump precipitation according to an embodiment of the present invention before casting, in step s2, a constructor digs a pit with a length, a width, and a height of 1m at a center of a horizontal plane of a pit bottom of the sump.
Specifically, in step s2, a sewage pump is placed in the drainage layer; the power of the sewage pump is 1.5kW.
Specifically, in the step s2, the bottom of the steel pipe sleeve is positioned at 1m of the water filtering layer at the bottom of the raft, and a hole with the diameter of 5mm is formed in the part, positioned on the water filtering layer, of the steel pipe sleeve; the bottom of the steel pipe sleeve and the part of the steel pipe sleeve positioned on the drainage layer are coated with a steel wire mesh; and brushing antirust paint on the steel pipe sleeve.
Specifically, in step s2, when the drain pipe is led to the foundation pit, a detector arranged on the drain pipe detects the water pressure P applied to the bottom of the drain pipe, and a controller connected with the detector compares the water pressure P with a preset value to judge whether to prompt a constructor to adjust the depth L of the drain pipe; the controller comprises a display device for receiving the information detected by the detector and controlling the depth of the drain pipe by operating the controller by a constructor through the display device, the controller is provided with a first preset pressure P1, a second preset pressure P2, a first regulating coefficient alpha 1 and a second regulating coefficient alpha 2, wherein P1 is more than 0 and less than P2, alpha 1 is more than 0 and less than 1 and less than alpha 2,
if P is not more than P1, the controller prompts a constructor to adjust the depth L to L 'of the drain pipe by using alpha 2, and L' = L multiplied by alpha 2 is set;
if P1 is larger than P and is smaller than or equal to P2, the controller does not need to prompt constructors to adjust the depth of the drain pipe;
if P2 < P, the controller prompts the constructor to adjust the depth L to L 'of the drainage pipe by using alpha 1, and sets L' = L multiplied by alpha 1.
Specifically, when the depth L to L 'of the drain pipe is adjusted by a constructor, the controller controls the detector to detect the water pressure P applied to the bottom of the drain pipe at the moment again and compares the P with a preset value to judge whether to adjust the depth L' of the drain pipe continuously, the controller calculates the depth L 'and the adjustment times N after the adjustment of the drain pipe when adjusting the depth of the drain pipe, the controller stops the adjustment process when the depth L' and/or the adjustment times N after the adjustment of the drain pipe exceed the preset value, the controller is provided with the maximum adjustment times Nmax, the maximum drain pipe depth Lmax and the minimum drain pipe depth Lmin,
if L 'is more than or equal to Lmax, L' is less than or equal to Lmin or N is more than or equal to Nmax, the controller judges that the adjustment of the depth of the drainage pipe is stopped and gives an alarm to constructors through the display device;
if Lmin is less than L' < Lmax, the controller judges that the adjustment of the depth of the drain pipe is allowed;
if N < Nmax, the controller determines that adjustment of the drain depth is permitted.
Specifically, when the detector detects the depth of the bottom of the drain pipe, the controller compares the density Q of water detected by the detector with a preset value to judge whether to adjust a first preset pressure P1 and a second preset pressure P2, the controller is provided with a first preset density Q1, a second preset density Q2, a first density adjusting coefficient beta 1 and a second density adjusting coefficient beta 2, wherein Q1 is more than 0 and less than Q2, beta 1 is more than 0 and less than 1 and less than beta 2,
if Q is less than or equal to Q1, the controller determines to adjust P1 to P1 'and adjust P2 to P2' using β 1, setting P1'= P1 × β 1, P2' = P2 × β 1;
if Q1 is larger than Q and is not larger than Q2, the controller judges that the P1 and the P2 do not need to be adjusted;
if Q2 < Q, the controller determines to adjust P1 to P1 'using β 2 and to adjust P2 to P2', setting P1'= P1 × β 2, P2' = P2 × β 2.
Please refer to fig. 3, which is a cross-sectional view of a sump precipitation after casting according to an embodiment of the present invention, in step s2, the high-strength grouting material is C50 grouting material; the thickness of the steel plate is 10mm.
Referring to fig. 4, which is a sectional view of pit dewatering according to the second embodiment of the present invention, in step s3, the caisson is provided with a valve, and when the caisson is placed, a constructor opens the valve to let water in the pit flow into the caisson so that the caisson sinks slowly; the bottom of the caisson is provided with a steel pipe sleeve with the diameter of 50mm so as to discharge water in the caisson and enable the caisson to sink to the bottom; the top of the caisson is 150mm higher than the water level elevation; and after the caisson is placed, pouring C40P8 concrete around the caisson by constructors.
Please refer to fig. 5, which is a front view of the caisson of the embodiment of the present invention, when the caisson is placed, the constructor ensures that the placement position of the caisson is consistent with the center position of the water collection pit; every face all connects the welding all around the caisson has 8# channel-section steel to every side all welds all around the caisson has the U type hoop that has C14 reinforcing bar machine-shaping, and vertical and horizontal interval is 300mm between every U type hoop.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A special precipitation method for construction is characterized by comprising the following steps:
step s1, a constructor measures the top elevation of the pad at the precipitation point position of a construction site to select a precipitation scheme, if the top elevation of the pad at the precipitation point position of the construction site is more than 41.7m, the constructor selects a first precipitation scheme, and if the top elevation of the pad at the precipitation point position of the construction site is 41.7m or less, the constructor selects a second precipitation scheme;
step s2, if the first dewatering scheme is selected, construction personnel dry underground open water in the water collecting pit and manually clean the pit bottom, a water pit is dug in the center of the horizontal plane of the pit bottom of the water collecting pit, broken stone is backfilled into the water pit to serve as a water filtering layer, a steel pipe sleeve is penetrated by an externally-coated steel wire mesh of a drain pipe, the drain pipe is guided to the foundation pit to perform pumping drainage, a cushion layer is poured and a bottom plate is subjected to waterproof installation after the pumping drainage is completed, reinforcing steel bars of the bottom plate are bound, concrete of the bottom plate is poured, the construction personnel cut off a water pumping pipe after the pouring is completed, high-strength grouting material is poured into the steel pipe sleeve and vibrated by using a vibrating rod, and full-weld sealing steel plates are used after the high-strength grouting material is densely filled in reserved grooves in the steel plates;
step s3, if choose for use precipitation scheme two, constructor uses the excavator to excavate the sump pit to bed course bottom elevation and puts at sump pit central point and place the steel sheet caisson, and constructor keeps the caisson edge to be higher than the water level, and constructor pours the concrete around the caisson after the completion is placed to the steel sheet caisson till the concrete surface reaches bottom elevation position, pours the back and carries out the pump drainage to ponding in the caisson, carries out the construction of bed course and waterproof layer after the pump drainage is accomplished.
2. The method as claimed in claim 1, wherein in step s2, the length, width and height of the pit dug by the constructor at the center of the bottom horizontal plane of the water collecting pit are all 1m.
3. The method of claim 1, wherein in step s2, a sewage pump is disposed in the drainage layer; the power of the sewage pump is 1.5kW.
4. The method as claimed in claim 1, wherein in step s2, the high-strength grouting material is C50 grouting material; the thickness of the steel plate is 10mm.
5. The special dewatering method for construction according to claim 1, wherein in the step s2, the bottom of the steel pipe sleeve is located at 1m of a water filtering layer at the bottom of the raft, and a hole with the diameter of 5mm is formed in the part, located on the water filtering layer, of the steel pipe sleeve; the bottom of the steel pipe sleeve and the part of the steel pipe sleeve positioned on the drainage layer are coated with a steel wire mesh; and brushing antirust paint on the steel pipe sleeve.
6. The method of lowering water level dedicated to construction according to claim 1, wherein in step s3, when the caisson is placed, the constructor ensures that the caisson placing position is consistent with the center position of the water collecting pit; every face all connects the welding all to have 8# channel-section steel all around the caisson to every side all welds all around the caisson has the U type hoop that has C14 reinforcing bar machine-shaping, and vertical and horizontal interval is 300mm between every U type hoop.
7. A precipitation method specific to construction according to claim 1, wherein in said step s3, said caisson is provided with a valve which is opened by a constructor when the caisson is placed so that the water in the sump flows into the caisson and the caisson sinks slowly; discharging water in the caisson through a steel pipe sleeve with the diameter of 50mm arranged at the bottom of the caisson so as to enable the caisson to sink to the bottom; the top of the caisson is 150mm higher than the water level elevation; and after the caisson is placed, pouring C40P8 concrete around the caisson by constructors.
8. The special dewatering method for construction according to claim 1, wherein in the step s2, when the drainage pipe is led to the foundation pit, a detector arranged on the drainage pipe is used for detecting water pressure P applied to the bottom of the drainage pipe, and a controller connected with the detector compares the pressure P with a preset value to judge whether to prompt a constructor to adjust the depth L of the drainage pipe; the controller comprises a display device for receiving the information detected by the detector and controlling the depth of the drain pipe by operating the controller by a constructor through the display device, the controller is provided with a first preset pressure P1, a second preset pressure P2, a first regulating coefficient alpha 1 and a second regulating coefficient alpha 2, wherein P1 is more than 0 and less than P2, alpha 1 is more than 0 and less than 1 and less than alpha 2,
if P is less than or equal to P1, the controller prompts a constructor to adjust the depth L to L 'of the drainage pipe by using alpha 2, and sets L' = L multiplied by alpha 2;
if P1 is more than P and less than or equal to P2, the controller does not need to prompt a constructor to adjust the depth of the drain pipe;
if P2 < P, the controller prompts the operator to adjust the depth L to L 'of the drain pipe using α 1, and sets L' = L × α 1.
9. The precipitation method special for construction according to claim 8, wherein when the constructor adjusts the depth L to L 'of the drainage pipe, the controller controls the detector to detect the water pressure P applied to the bottom of the drainage pipe again and compares P with a preset value to judge whether to adjust the depth L' of the drainage pipe continuously, the controller calculates the adjusted depth L 'and the adjusted number of times N of the drainage pipe when adjusting the depth of the drainage pipe, the controller stops the adjustment process when the adjusted depth L' and/or the adjusted number of times N of the drainage pipe exceed the preset value, the controller is provided with a maximum adjustment number Nmax, a maximum drainage pipe depth Lmax and a minimum drainage pipe depth Lmin,
if L 'is more than or equal to Lmax, L' is less than or equal to Lmin or N is more than or equal to Nmax, the controller judges that the adjustment of the depth of the drainage pipe is stopped and gives an alarm to constructors through the display device;
if Lmin is less than L' < Lmax, the controller judges that the adjustment of the depth of the drainage pipe is allowed;
if N < Nmax, the controller determines that adjustment of the drain depth is permitted.
10. The special construction precipitation method of claim 9, wherein when the detector detects the depth of the bottom of the drainage pipe, the controller compares the density Q of the water detected by the detector with a preset value to determine whether to adjust the first preset pressure P1 and the second preset pressure P2, the controller is provided with a first preset density Q1, a second preset density Q2, a first density adjustment coefficient β 1, and a second density adjustment coefficient β 2, wherein Q1 is greater than 0 and less than Q2, β 1 is greater than 0 and less than 1 and less than β 2,
if Q is less than or equal to Q1, the controller determines to adjust P1 to P1 'and adjust P2 to P2' using β 1, setting P1'= P1 × β 1, P2' = P2 × β 1;
if Q1 is more than Q and less than or equal to Q2, the controller judges that P1 and P2 do not need to be adjusted;
if Q2 < Q, the controller determines to adjust P1 to P1 'using β 2 and to adjust P2 to P2', setting P1'= P1 × β 2, P2' = P2 × β 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211020928.7A CN115559337B (en) | 2022-08-24 | 2022-08-24 | Precipitation method special for construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211020928.7A CN115559337B (en) | 2022-08-24 | 2022-08-24 | Precipitation method special for construction |
Publications (2)
| Publication Number | Publication Date |
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| CN115559337A true CN115559337A (en) | 2023-01-03 |
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