CN110863502A - Construction method and plugging structure for dynamically adjusting foundation pit dewatering and plugging dewatering well - Google Patents
Construction method and plugging structure for dynamically adjusting foundation pit dewatering and plugging dewatering well Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 176
- 238000001556 precipitation Methods 0.000 claims abstract description 86
- 238000007789 sealing Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 83
- 239000011248 coating agent Substances 0.000 claims description 48
- 238000000576 coating method Methods 0.000 claims description 48
- 238000007667 floating Methods 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 36
- 239000004567 concrete Substances 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 21
- 239000011247 coating layer Substances 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 11
- 239000003673 groundwater Substances 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 8
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- 238000002425 crystallisation Methods 0.000 claims description 2
- 230000008025 crystallization Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000004364 calculation method Methods 0.000 description 6
- 239000002349 well water Substances 0.000 description 5
- 235000020681 well water Nutrition 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- 239000012528 membrane Substances 0.000 description 1
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- 238000004078 waterproofing Methods 0.000 description 1
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- 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
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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Abstract
The invention relates to a method for constructing a deep foundation pit of a building, in particular to a construction method for dynamically adjusting foundation pit dewatering and plugging a dewatering well, which comprises the steps of reducing the underground water level; constructing a forming cushion layer; constructing a raft foundation layer, and arranging a first water stop plate at the contact position of the precipitation well and the raft foundation layer; and a closing plate is arranged, and the outer edge of the closing plate is fixedly connected with the inner side wall of the dewatering well. The invention also relates to a plugging structure of the dewatering well, which comprises the dewatering well inserted on the foundation, and further comprises a cushion layer, a waterproof layer and a raft foundation layer which are sequentially laid on the foundation, the dewatering well penetrates through the cushion layer, the waterproof layer and the raft foundation layer and protrudes out of the raft foundation layer, and expansion strips are wound at the contact position of the outer edge of the dewatering well and the cushion layer. The cushion layer can play a waterproof role, and water in the dewatering well is prevented from seeping out of the well pipe. The raft foundation layer plays a role in protecting the cushion layer, and the cushion layer is prevented from being damaged. The sealing plate seals the wellhead of the dewatering well, so that the effect of plugging the dewatering well is further enhanced.
Description
Technical Field
The invention relates to a construction method of a deep foundation pit of a building, in particular to a construction method and a plugging structure for dynamically adjusting foundation pit dewatering and plugging a dewatering well.
Background
For a long time, during the process of earth excavation of most deep foundation pit projects in China, the situations of overhigh underground water level and overlarge surface water volume can be met, and in order to effectively improve construction conditions and ensure construction safety, a dewatering well is reasonably arranged outside the foundation pit usually.
After the underground structure construction and the earthwork backfilling are finished, when the underground water level elevation meets the anti-floating water level elevation of the design requirement, the precipitation can be stopped. And after the dewatering well stops dewatering, the dewatering well at the position of the raft plate in the foundation pit needs to be plugged according to the building function requirement. In order to facilitate plugging of the dewatering well, the dewatering well pipe generally adopts an iron pipe, a water stop plate is welded on the periphery of the well pipe, cement mortar is injected into the well pipe, and a water stop plate is welded at the mouth of the well pipe for sealing.
The above prior art solution has the following drawbacks: when the dewatering well is arranged, the well pipe needs to penetrate through the basic raft, so that the waterproof layer of the raft is damaged. When plugging is carried out on the dewatering well, only one water stop plate is welded on the periphery of the well pipe, no special waterproof treatment is carried out, the water stop effect cannot be achieved, and underground water can permeate the basement ground along the outer wall of the well pipe through the damaged waterproof layer.
Disclosure of Invention
The invention aims to provide a dewatering well plugging structure and a construction method thereof, and aims to solve the problem of water seepage after plugging of a deep foundation pit in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the construction method for dynamically adjusting foundation pit dewatering and plugging the dewatering well is characterized by comprising the following construction steps:
lowering the underground water level, dynamically adjusting the underground water level, and winding expansion strips on the outer edge of the dewatering well;
constructing a forming cushion layer, paving a waterproof coating layer group and a waterproof coiled material on the cushion layer, and winding a water stop sleeve ring at the contact position of the waterproof coiled material and the dewatering well;
constructing a raft foundation layer, constructing and molding the raft foundation layer on the waterproof coiled material, and arranging a first water stop plate at the contact position of the precipitation well and the raft foundation layer, wherein the first water stop plate is sleeved at the outer edge of the precipitation well;
and a closing plate is arranged in the dewatering well, and the outer edge of the closing plate is fixedly connected with the inner side wall of the dewatering well.
And constructing a sealing pier cover, namely pouring the sealing pier cover on the wellhead of the dewatering well after the sealing plate is arranged, wherein the sealing pier cover is positioned on the wellhead of the dewatering well and seals the wellhead of the dewatering well.
Further, the construction method also comprises the following construction steps:
after the raft foundation layer is constructed, a waterproof sealing coating is smeared at the position, close to the top, of the raft foundation layer, and the waterproof sealing coating surrounds the dewatering well to be smeared.
Further, the construction method also comprises the following construction steps:
after the waterproof sealing coating is smeared, a second water stop plate is arranged at the outer edge of the dewatering well and sleeved on the outer edge of the dewatering well, and the second water stop plate is located above the waterproof sealing coating.
Further, the construction method also comprises the following construction steps:
before the closing plate is arranged, plugging materials are filled into the dewatering well until the distance between the height of the plugging materials and the wellhead of the dewatering well is 100 mm-300 mm.
Further, the plugging material comprises cement and impervious self-compacting micro-expansion fine stone concrete. .
Further, when the plugging material is filled into the dewatering well, firstly, filling cement into the dewatering well and refilling impervious self-compacting micro-expansion fine stone concrete.
Further, the closed pier cover is a poured concrete pier, the radius of the closed pier cover is 500mm to 750mm, and the thickness of the closed pier cover is 300mm to 500mm thick.
Further, the method for dynamically adjusting the groundwater level comprises the following steps:
before the construction of the external main structure, the anti-floating capacity of an initial anti-floating object is calculated, an initial control water level elevation is determined, and the underground water level is reduced to be not higher than the initial control water level elevation.
Further, the method for dynamically adjusting the groundwater level comprises the following steps:
and in the external main structure construction stage, calculating the anti-floating capacity of the anti-floating object in the stage, determining the stage control water level elevation, and adjusting the height of the underground water level to be not higher than the stage control water level elevation.
Further, the waterproof coating layer set includes either or both of a cement-based capillary crystalline waterproof coating and a non-cured rubberized asphalt waterproof coating.
The invention also discloses a plugging structure of the dewatering well, which comprises the dewatering well inserted on a foundation, and further comprises a cushion layer, a waterproof layer and a raft foundation layer which are sequentially laid on the foundation, wherein the dewatering well penetrates through the cushion layer, the waterproof layer and the raft foundation layer and protrudes out of the raft foundation layer, and an expansion strip is wound at the contact position of the outer edge of the dewatering well and the cushion layer.
Further, still include first stagnant water board, first stagnant water board cover is located the outer fringe of precipitation well, just first stagnant water board sets up precipitation well with raft foundation layer junction department.
Furthermore, a closing plate is arranged at the upper port of the dewatering well, and the outer edge of the closing plate is fixed on the inner wall of the dewatering well.
Further, the number of the closing plates is at least two.
Further, the device also comprises a closed pier cover for closing the wellhead of the dewatering well, and the radius of the closed pier cover is 500mm to 750mm, and the thickness of the closed pier cover is 300mm to 500 mm.
Further, the waterproof layer comprises a waterproof coating layer set coated on the cushion layer and a waterproof coiled material paved on the waterproof coating layer set.
Further, the waterproof coating layer set comprises a cement-based permeable crystallization type waterproof coating and a non-cured rubber asphalt waterproof coating.
Further, the position that the outer fringe of precipitation well with waterproofing membrane contacted is equipped with the stagnant water lantern ring.
In conclusion, the beneficial effects of the invention are as follows:
1. the underground water level is reduced, and subsequent construction is facilitated to be carried out, and the plugging of the dewatering well is better realized. The shaping bed course can play waterproof effect, avoids the water in the precipitation well to ooze from the well casing, flows to the basement in. The raft foundation layer plays a role in protecting the cushion layer, and avoids the damage of the cushion layer and the water seepage on the ground. The sealing plate seals the well mouth of the precipitation well, and the outer edge of the sealing plate is fixed on the inner wall of the precipitation well, so that the effect of plugging the precipitation well is further enhanced, and water in the precipitation well is prevented from permeating into the underground chamber of a building. Through the waterproof coating layer of the expansion strip, the underground water is prevented from blocking, the underground water is prevented from permeating into the underground chamber, and the waterproof strengthening effect is achieved. The expansion strip has the property of expanding when meeting water, and when underground water seeps out, the expansion strip expands to block a water seepage gap, so that the water seepage amount is slowed down, and the water seepage of a basement is avoided. The outer fringe of precipitation well is located to first stagnant water board cover, and first stagnant water board setting is in the contact position of precipitation well and raft foundation layer, and this kind of setting can block the outer wall of precipitation well, avoids well water to ooze from the outer wall of precipitation well.
2. The sealing plates are arranged on the inner wall of the well pipe, so that the sealing of the well pipe is enhanced, and the underground water is prevented from leaking out of the well pipe.
3. Through setting up the stagnant water lantern ring, and the stagnant water lantern ring is the rubber material, and the rubber stagnant water lantern ring has played waterproof effect, has avoided groundwater to ooze from the lateral wall of well casing.
4. By arranging the waterproof sealing coating, the waterproofness of the well pipe is enhanced, and the underground water is prevented from leaking out of the well pipe. And the waterproofness of the well pipe is enhanced by arranging the second water stop plate. Meanwhile, the second water stop plate is positioned above the waterproof sealing coating, so that the waterproof sealing coating is protected. When concrete is poured in subsequent construction, the phenomenon that the concrete directly impacts the waterproof sealing coating to cause damage to the waterproof sealing coating is avoided.
5. During the period from the beginning of underground precipitation to the stopping of underground precipitation, the original precipitation power is kept unchanged, and the underground water level is always controlled at the same elevation. In practice, the anti-floating capacity of the structure is calculated according to the highest underground water level in a geological survey report, the calculation result is multiplied by a large safety factor, and the anti-floating design is very conservative. The continuous construction is finished along with the external main structure, and the design precipitation requirement is not changed, so that a large amount of useless work is done in the precipitation work, and unnecessary resource waste is caused. Therefore, through different construction stages of the external main body structure, the anti-floating capacity of the stages is calculated, the stage control water level elevation is determined, and the construction cost and the manual maintenance cost are greatly saved for the dynamic adjustment of the foundation pit precipitation water level.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic partial sectional structural view of a plugging structure of a dewatering well according to an embodiment of the present invention;
fig. 2 is another schematic partial sectional structural view of a plugging structure of a dewatering well according to an embodiment of the present invention;
description of reference numerals:
1. dewatering wells; 11. an expansion strip; 12. a first water stop plate; 13. a closing plate; 14. a water stop sleeve ring; 15. waterproof sealing paint; 16. a second water stop plate; 17. a plugging material; 2. a foundation; 21. a cushion layer; 3. a raft foundation layer; 4. a waterproof layer; 41. a waterproof coating layer set; 411. a cement-based capillary crystalline waterproof coating; 412. non-curing rubber asphalt waterproof paint; 42. waterproof coiled materials; 43. a protective layer; 5. closing the pier cap.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like 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 in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, the invention further provides a construction method for dynamically adjusting foundation pit dewatering and a dewatering well 1 plugging structure, which is used for implementing the dewatering well 1 plugging structure and the dewatering well 1 plugging structure in any one of the above-mentioned methods, and the construction method comprises the following construction steps:
s1, lowering the underground water level, and winding the expansion strip 11 on the outer edge of the precipitation well 1 when the water level is lowered to a preset value; one hour before the construction, increase precipitation power, reduce ground water level, then installation inflation strip 11, inflation strip 11 has the nature of meeting water inflation, and when groundwater oozes, inflation strip 11 inflation blocks the gap that oozes water, has slowed down the infiltration volume, has avoided the basement infiltration.
S2, constructing and forming a cushion layer 21, paving a waterproof coating layer group 41 and a waterproof coiled material 42 on the cushion layer 21, and winding a water stop collar 14 at the contact position of the waterproof coiled material 42 and the dewatering well 1. The waterproof coating layer group 41 includes either or both of a cement-based capillary crystalline waterproof coating 411 and a non-cured rubberized asphalt waterproof coating 412, in this embodiment, the cement-based capillary crystalline waterproof coating 411 is coated first, and then the non-cured rubberized asphalt waterproof coating 412 is coated on the cement-based capillary crystalline waterproof coating 411; the rubber water stop collar 14 acts as a water stop to prevent ground water from seeping out of the side wall of the well casing.
S3, constructing a raft foundation layer 3, constructing and forming the raft foundation layer 3 on the waterproof coiled material 42, arranging a first water stop plate 12 at the contact position of the precipitation well 1 and the raft foundation layer 3, and sleeving the first water stop plate 12 on the outer edge of the precipitation well 1; the first water stop plate 12 is sleeved on the outer edge of the dewatering well 1, and can block the outer wall of the dewatering well 1 to prevent well water from leaking out of the outer wall of the dewatering well 1.
S4, coating waterproof sealing paint 15 on the raft foundation layer 3 near the top, and coating the waterproof sealing paint 15 around the dewatering well 1. After the waterproof sealing coating 15 is smeared, a second water stop plate 16 is arranged at the outer edge of the dewatering well 1, the second water stop plate 16 is sleeved at the outer edge of the dewatering well 1, and the second water stop plate 16 is positioned above the waterproof sealing coating 15. The second water stop plate 16 may be installed first, and then the waterproof sealing paint 15 is applied, as long as the second water stop plate 16 is located above the waterproof sealing paint 15, which is not limited herein. The second water stop plate 16 is a steel plate, so that the waterproof performance of the well pipe is enhanced, and meanwhile, the second water stop plate 16 is positioned above the waterproof sealing coating 15, so that the waterproof sealing coating 15 is protected.
S5, a closing plate 13 is arranged, the closing plate 13 is arranged inside the precipitation well 1, and the outer edge of the closing plate 13 is fixedly connected with the inner side wall of the precipitation well 1. Specifically, the closing plates 13 are steel plates, the number of the closing plates is two, and the closing plate 13 at the top is level with the upper end of the well pipe. The closing plate 13 closes the wellhead, so that water in the precipitation well 1 is prevented from overflowing, and external water is prevented from entering the precipitation well 1.
S6, constructing a sealing pier cover 5, and pouring the sealing pier cover 5 on the wellhead of the dewatering well 1 after the sealing plate 13 is arranged, wherein the sealing pier cover 5 is positioned on the wellhead of the dewatering well 1 and seals the wellhead of the dewatering well 1. The closed pier cover 5 is a poured concrete pier, the radius of the closed pier cover 5 is 500mm to 750mm, the thickness of the closed pier cover is 300mm to 500mm thick, the radius of the closed pier cover 5 in the embodiment is 600mm, and the thickness of the closed pier cover is 400 mm. The cement mound of setting at precipitation well 1 top is closed mound lid 5, and it is for carrying out the confined closing cap to precipitation well 1 after the completion, can seal the precipitation mouth through this closing cap to guarantee that water can not get into the inside of precipitation well 1 from the top of precipitation well 1, wherein the shape of closing mound lid 5 can be for the radius be 500mm to 750mm, and thickness is 300mm to 500 mm's cylindrical mound lid, also can be the mound lid of square mound lid or other shapes. Of course, the dimensions of the closing pier cap 5 can be larger according to the actual conditions and the specific requirements, and are not limited solely here.
The underground water level is reduced, the subsequent construction is convenient to carry out, and the plugging of the dewatering well 1 is better realized. The formed cushion layer 21 can play a role of water prevention, and water in the dewatering well 1 is prevented from seeping out of the well pipe and flowing into the underground chamber. Raft foundation layer 3 has played the effect of protection to bed course 21, avoids bed course 21 to damage, causes the ground infiltration. The closing plate 13 closes the wellhead of the precipitation well 1, and the outer edge of the closing plate 13 is fixed on the inner wall of the precipitation well 1, so that the plugging effect of the precipitation well 1 is further enhanced, and water in the precipitation well 1 is prevented from permeating into the underground chamber of a building. Through setting up expansion strip 11 and waterproof coating layer, prevent stifled to groundwater, avoid groundwater infiltration to the basement in, played and strengthened waterproof effect. The expansion strip 11 has the property of water swelling, when underground water seeps out, the expansion strip 11 expands to block the water seepage gap, slow down the water seepage amount and avoid the water seepage of a basement. The outer edge of the precipitation well 1 is sleeved with the first water stop plate 12, and the first water stop plate 12 is arranged at the contact position of the precipitation well 1 and the raft foundation layer 3, so that the outer wall of the precipitation well 1 can be blocked, and the well water is prevented from seeping out from the outer wall of the precipitation well 1.
Further, the construction method of the plugging structure of the dewatering well 1 provided by the invention further comprises the following construction steps:
before the closing plate 13 is arranged, the plugging material 17 is filled in the dewatering well 1 until the distance from the height of the plugging material 17 to the wellhead of the dewatering well 1 is 100mm to 300mm, and in this embodiment, the distance from the wellhead of the dewatering well 1 is 200 mm. The plugging material 17 comprises cement and impervious self-compacting micro-expansion fine stone concrete. When the plugging material 17 is filled in the dewatering well 1, firstly, the impervious self-compacting micro-expansion fine stone concrete is filled in the dewatering well 1.
Specifically, before the plugging material 17 is filled, the water pump in the dewatering well 1 needs to be pulled out, after the water pump is taken out, a bag of cement is put into the dewatering well 1, and then the impervious self-compacting micro-expansive fine stone concrete is put into the dewatering well. Of course, the cement and the impervious self-compacting micro-expansion fine stone concrete can be replaced by other water-swelling building materials according to the construction requirements.
Further, the construction method of the plugging structure of the dewatering well 1 provided by the invention further comprises the following construction steps:
before the construction of the external main structure, the anti-floating capacity of an initial anti-floating object is calculated, an initial control water level elevation is determined, and the underground water level is reduced to be not higher than the initial control water level elevation. Then proceeding to the construction stage of the external main body structure
And in the external main structure construction stage, calculating the anti-floating capacity of the anti-floating object in the stage, determining the stage control water level elevation, and adjusting the height of the underground water level to be not higher than the stage control water level elevation.
Wherein, the initial control water level elevation refers to the water level height of the lower surface of the raft foundation layer 3, and the water level is reduced below the raft foundation layer 3, so that buoyancy cannot be generated on main structures such as the raft and the like. The stage control water level elevation refers to the anti-floating water level elevation of the constructed main structure and the anti-floating object. When the underground water level is controlled, water is pumped by a water pump, water in the dewatering well 1 penetrating through the raft foundation layer 3 is discharged into the dewatering well 1 outside the raft foundation layer 3, the water level control during construction is realized, namely the underground water level is controlled by a well point dewatering method.
The calculation method for initially controlling the water level elevation comprises the following steps: firstly, selecting an anti-floating object, wherein the anti-floating object in the implementation is an anti-floating anchor rod, and the calculation method for the initial control water level height of the anti-floating anchor rod is as follows:
the number of the anti-floating anchor rods in the computing unit is m, the characteristic value FkN of the uplift bearing capacity of each anchor rod is obtained, the weight of the structural beam is used as anti-floating safety storage and is not computed, one axial network line is a computing unit, before a building plan is drawn, the axial network line is required to be drawn firstly, the axial network line is a network formed by building axes, the axial network line is artificially marked on the central line of a symmetrical interface or a section component in order to mark the detailed size of the component in the building drawing according to a common customary standard.
F0＝F*m
G＝0KN F1＝r*h＝F0
PF＝F/S
h＝P/Y
G+F0≥F1
G is the self gravity of the structure; f0For resisting pulling force of anti-floating anchor rod
F1Is buoyancy of water
h is the height of the water level; p is the pressure intensity; s is the bottom area of the raft foundation layer;
y is the gravity of water
Therefore, the height of the water level of the anti-floating anchor rod in the common area is h m, so that the height of the water level of the anti-floating anchor rod in the area only under the action of the anchor rod alone is hp1 m:
hp1＝hs+h
hp1 stage control water level elevation
hs is the initial water level elevation control
No matter what the elevation of the water level capable of resisting is, the precipitation height is below the foundation slab, and the anti-floating anchor rod does not play a role because the main structure is not constructed at the moment.
The stage control water level elevation calculation method in the external main body structure construction stage comprises the following steps:
firstly, converting a cushion layer and a base structure:
h1＝H*n
h is the thickness of the concrete structure;
n is the weight ratio of concrete to water;
and at the construction completion stage, converting an external main body structure:
h2＝H*n
h is the thickness of the concrete structure; n is the weight ratio of concrete to water;
therefore, the level of the water level capable of resisting at this time is as follows:
h＝h1+h2
the height of the anti-floating anchor rod in the common area capable of resisting the water level is h meters. Therefore, the water level resisting elevation of the area is hp2 m when the construction of the underground main body structure is completed;
hp2＝hp1+h
hp2 stage control water level elevation
Control water level elevation under hp1 anti-floating anchor rod effect
Therefore, after the construction of the external main structure is completed, the height of the foundation pit precipitation is adjusted to hp2 m from the original water level not exceeding hs.
Along with outside major structure's construction goes on, calculates the stage water level elevation of different construction stages, is less than relative water level elevation when stage water level elevation, and the water level is more stable, satisfies the condition that stops precipitation this moment, can stop precipitation to the precipitation well, can carry out the shutoff to the precipitation well afterwards.
During the period from the beginning of underground precipitation to the stopping of underground precipitation, the original precipitation power is kept unchanged, and the underground water level is always controlled at the same elevation. In practice, the anti-floating capacity of the structure is calculated according to the highest underground water level in a geological survey report, the calculation result is multiplied by a large safety factor, and the anti-floating design is very conservative. The continuous construction is finished along with the external main structure, and the design precipitation requirement is not changed, so that a large amount of useless work is done in the precipitation work, and unnecessary resource waste is caused. Therefore, through different construction stages of the external main body structure, the anti-floating capacity of the stages is calculated, the stage control water level elevation is determined, the dynamic adjustment of the foundation pit precipitation water level is realized, the construction cost and the manual maintenance cost are greatly saved, and the foundation pit can be precipitated in advance. During the period from the beginning of underground precipitation to the stopping of underground precipitation, the original precipitation power is kept unchanged, and the underground water level is always controlled at the same elevation. In practice, the anti-floating capacity of the structure is calculated according to the highest underground water level in a geological survey report, the calculation result is multiplied by a large safety factor, and the anti-floating design is very conservative. The continuous construction is finished along with the external main structure, and the design precipitation requirement is not changed, so that a large amount of useless work is done in the precipitation work, and unnecessary resource waste is caused. Therefore, through different construction stages of the external main body structure, the anti-floating capacity of the stages is calculated, the stage control water level elevation is determined, the dynamic adjustment of the foundation pit precipitation water level is realized, the construction cost and the manual maintenance cost are greatly saved, and the foundation pit can be precipitated in advance.
Referring to fig. 1 and 2, a plugging structure of a dewatering well 1 according to the present invention will now be described. The plugging structure of the dewatering well 1 comprises a dewatering well 1 inserted into a foundation 2 and a cushion layer 21, a waterproof layer 4 and a raft foundation layer 3 sequentially laid on the foundation 2, the dewatering well 1 penetrates through the cushion layer 21, the waterproof layer 4 and the raft foundation layer and protrudes out of the raft foundation layer 3, the outer edge of the dewatering well 1 and the position of the cushion layer 21 in contact are wound with expansion strips 11, the foundation 2 is generally an existing foundation member which is laid, the dewatering well 1 is inserted into the foundation 2, the cushion layer 21, the waterproof layer 4 and the raft foundation layer 3 are sequentially laid on the foundation 2, the height of the top end of the dewatering well is generally higher than that of the raft foundation layer 3, the expansion strips 11 are annularly arranged on the outer side of the cushion layer 21, the expansion strips 11 need to be installed before the cushion layer 21 is laid, and the expansion strips 11 in the embodiment are putty type expansion strips. The water expansion property of the expansion strip 11 blocks the water seepage gap by the expansion strip 11 when underground water seeps out, so that the water seepage amount is reduced, and the water seepage of a basement is avoided. According to the actual situation and the specific requirement, the putty type expansion strip can be replaced by other types of expansion strips 11, such as a concrete sealing strip, and the top of the dewatering well 1 can be flush with the top of the raft foundation layer 3.
Further, as a specific embodiment of the plugging structure of the dewatering well 1 provided by the present invention, a first water stop plate 12 is sleeved on the outer edge of the dewatering well water 1, and the first water stop plate 12 is disposed at the connection position of the dewatering well 1 and the raft foundation layer 3. Wherein, precipitation well 1 and first stagnant water board 12 are fixed connection, and fixed connection can be for pasting, bolted connection and modes such as welding, and first stagnant water board 12 sets up and is close to into top or below position all can in precipitation well 1 and raft foundation layer 3's junction, and first stagnant water board 12 as long as be located raft foundation layer 3 can satisfy the condition, consequently does not prescribe a limit to the concrete position of first stagnant water board 12. The first water stop plate 12 blocks the outer wall of the dewatering well 1, so that well water is prevented from seeping out of the outer wall of the dewatering well 1, and the effect of primary water stop is achieved.
Further, as a specific embodiment of the plugging structure of the dewatering well 1 provided by the present invention, the upper port of the dewatering well 1 is provided with a closing plate 13, the outer edge of the closing plate 13 is fixed on the inner wall of the dewatering well 1, the number of the closing plates 13 is at least two, in this embodiment, the closing plates 13 are steel plates, the number of the closing plates 13 is two, and the closing plate 13 at the top is level with the upper end of the well pipe. The fixing mode of the closing plate 13 can be sticking, bolt connection, welding and the like, the steel plate can be replaced by a plate made of other waterproof materials, and the closing plate 13 at the top can be lower than the upper end of the well pipe. The closing plate 13 closes the wellhead, so that water in the precipitation well 1 is prevented from overflowing, and external water is prevented from entering the precipitation well 1. Of course, according to practical conditions and specific requirements, in other embodiments of the present invention, the number of the closing plates may also be one, and is not limited herein.
Further, as a specific embodiment of the plugging structure of the dewatering well 1 provided by the present invention, the plugging structure further includes a sealing pier cap 5 for sealing the wellhead of the dewatering well 1, and the radius of the sealing pier cap 5 is 500mm to 750mm, and the thickness of the sealing pier cap is 300mm to 500mm, in this embodiment, the radius of the sealing pier cap 5 is 600mm, and the thickness of the sealing pier cap is 400 mm. Seal the mound lid for setting up the cement mound on precipitation mouth top, it carries out the confined closing cap to the precipitation well after the completion for, can seal the well head through this closing cap, thereby guarantee that water can not get into the inside of precipitation well 1 from 1 top of precipitation well, wherein seal 5 shapes of mound lid can be 500mm to 750mm for the radius, thickness is 300mm to 500 mm's cylindrical mound lid, also can set to prismatic or other irregular cubic shape mound lids, as long as satisfy seal the well head can. Of course, the dimensions of the closing pier cap 5 can be larger according to the actual conditions and the specific requirements, and are not limited solely here.
Further, as a specific embodiment of the plugging structure of the dewatering well 1 provided by the present invention, a waterproof sealing coating 15 surrounding the dewatering well 1 is coated on the raft foundation layer 3 near the top, where the waterproof sealing coating 15 in this embodiment is a water-tight coating. The outer edge position of precipitation well 1 is provided with second sealing plate 16, second sealing plate 16 cover is located the outer edge of precipitation well 1, second sealing plate 16 is located waterproof sealing coating 15's top. The water-tight paint is a water-proof and moisture-proof material. It can not only effectively prevent moisture, prevent seepage and stop leakage, but also can be bonded with various materials; the material is divided into a retarding type and a quick-setting type, and is single-component gray powder. The delayed coagulation type is mainly used for moisture prevention and permeability resistance; the quick-setting type is mainly used for anti-permeability and leakage stoppage, and belongs to the prior art. The waterproof sealing paint 15 may be replaced by other waterproof paints such as asphalt, and the dewatering well 1 and the second water stop plate 16 are fixedly connected by means of adhesion, bolting, welding, and the like. And the second water stop plate 16 enhances the waterproof performance of the well pipe. Meanwhile, the second water stop plate 16 is positioned above the waterproof sealing coating 15, and plays a role in protecting the waterproof sealing coating 15. When concrete is poured in subsequent construction, the phenomenon that the concrete directly impacts the waterproof sealing coating 15 to cause damage to the waterproof sealing coating is avoided.
Further, as a specific embodiment of the plugging structure of the dewatering well 1 provided by the present invention, the waterproof layer 4 includes a waterproof coating layer group 41 coated on the cushion layer 21, a waterproof roll 42 laid on the waterproof coating layer group 41, and a protective layer 43 laid on the waterproof roll 42. The waterproof coating layer group 41 includes any one or more of a cement-based capillary crystalline waterproof coating 411 and a non-cured rubberized asphalt waterproof coating 412, and the cement-based capillary crystalline waterproof coating 411 may be applied first, and then the non-cured rubberized asphalt waterproof coating 412 may be applied on the cement-based capillary crystalline waterproof coating 411, or only one of the cement-based capillary crystalline waterproof coating 411 or the non-cured rubberized asphalt waterproof coating 412 may be applied. The waterproof roll 42 may be a waterproof material commonly used in construction, such as an asphalt waterproof material or a high polymer modified asphalt waterproof roll. The protective layer 43 may be formed by concrete or sand, and serves to protect the waterproof roll 42.
Further, as a specific embodiment of the plugging structure of the dewatering well 1 provided by the present invention, a water stop collar 14 is sleeved at a position where the outer edge of the dewatering well 1 contacts the waterproof roll 42, and the water stop collar 14 is made of rubber. The water-stopping lantern ring 14 is of an annular structure and is sleeved at the joint of the waterproof coiled material 42 and the dewatering well 1, and the water-stopping lantern ring 14 made of rubber can be replaced by other elastic waterproof materials.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (15)
1. A construction method for dynamically adjusting foundation pit dewatering and plugging a dewatering well is characterized by comprising the following construction steps:
lowering the underground water level, dynamically adjusting the underground water level, and winding expansion strips (11) on the outer edge of the dewatering well (1);
constructing and forming a cushion layer (21), paving a waterproof coating layer group (41) and a waterproof coiled material (42) on the cushion layer (21), and winding a water stop sleeve ring (14) at the contact position of the waterproof coiled material (42) and the dewatering well (1);
constructing a raft foundation layer (3), constructing and forming the raft foundation layer (3) on the waterproof coiled material (42), arranging a first water stop plate (12) at the contact position of the precipitation well (1) and the raft foundation layer (3), and sleeving the first water stop plate (12) on the outer edge of the precipitation well (1);
arranging a closing plate (13), arranging the closing plate (13) in the dewatering well (1), and fixedly connecting the outer edge of the closing plate (13) with the inner side wall of the dewatering well (1);
constructing a closed pier cover (5), and pouring the closed pier cover (5) on the well mouth of the dewatering well (1) after the closed plate (13) is arranged, wherein the closed pier cover (5) is positioned on the well mouth of the dewatering well (1) and is used for closing the well mouth of the dewatering well (1).
2. The construction method for dynamically adjusting foundation pit dewatering and plugging the dewatering well according to claim 1, further comprising the following construction steps:
after the raft foundation layer (3) is constructed, waterproof sealing coating (15) is smeared at the position, close to the top, of the raft foundation layer (3), and the waterproof sealing coating (15) surrounds the dewatering well (1) to be smeared.
3. The construction method for dynamically adjusting foundation pit dewatering and plugging the dewatering well according to claim 2, further comprising the following construction steps:
after the waterproof sealing coating (15) is smeared, a second water stop plate (16) is arranged at the outer edge of the dewatering well (1), the second water stop plate (16) is sleeved at the outer edge of the dewatering well (1), and the second water stop plate (16) is located above the waterproof sealing coating (15).
4. The construction method for dynamically adjusting foundation pit dewatering and plugging the dewatering well according to claim 1, further comprising the following construction steps:
before the closing plate (13) is arranged, plugging materials (17) are filled into the dewatering well (1) until the distance between the height of the plugging materials (17) and the wellhead of the dewatering well (1) is 100 mm-300 mm.
5. The construction method for dynamically adjusting foundation pit dewatering and plugging a dewatering well according to claim 4, wherein the plugging material (17) comprises cement and impervious self-compacting micro-expanded fine stone concrete.
6. The construction method for dynamically adjusting foundation pit rainfall and plugging a precipitation well according to claim 5, wherein when the plugging material (17) is filled into the precipitation well (1), the precipitation well (1) is filled with cement and then filled with impervious self-compacting micro-expansive fine stone concrete.
7. The construction method for dynamically adjusting foundation pit dewatering and plugging a dewatering well according to claim 1, wherein the closed pier cap (5) is a poured concrete pier, and the radius of the closed pier cap (5) is 500mm to 750mm, and the thickness of the closed pier cap is 300mm to 500mm thick.
8. The construction method for dynamically adjusting the precipitation of the foundation pit and plugging the precipitation well according to any one of claims 1 to 7, wherein the method for dynamically adjusting the groundwater level comprises the following steps:
before the construction of the external main structure, the anti-floating capacity of an initial anti-floating object is calculated, an initial control water level elevation is determined, and the underground water level is reduced to be not higher than the initial control water level elevation.
9. The construction method for dynamically adjusting the precipitation of the foundation pit and plugging the precipitation well according to the claim 8, wherein the method for dynamically adjusting the groundwater level comprises the following steps:
and in the external main structure construction stage, calculating the anti-floating capacity of the anti-floating object in the stage, determining the stage control water level elevation, and adjusting the height of the underground water level to be not higher than the stage control water level elevation.
10. The construction method for dynamically adjusting foundation pit dewatering and plugging a dewatering well according to any one of claims 1 to 7, wherein the waterproof coating layer group (41) comprises one or both of a cement-based permeable crystalline waterproof coating (411) and a non-cured rubberized asphalt waterproof coating (412).
11. A precipitation well plugging structure, which is constructed by adopting the foundation pit precipitation dynamic adjustment and precipitation well plugging structure construction method according to any one of claims 1 to 10, and which comprises a precipitation well (1) inserted on a foundation (2), and is characterized by further comprising a cushion layer (21), a waterproof layer (4) and a raft foundation layer (3) which are sequentially laid on the foundation (2), wherein the precipitation well (1) penetrates through the cushion layer (21), the waterproof layer (4) and the raft foundation layer (3) and protrudes out of the raft foundation layer (3), and an expansion strip (11) is wound at a position where the outer edge of the precipitation well (1) is in contact with the cushion layer (21).
12. The plugging structure of a dewatering well according to claim 11, further comprising a first water stop plate (12), wherein the first water stop plate (12) is sleeved on the outer edge of the dewatering well (1), and the first water stop plate (12) is arranged at the connection position of the dewatering well (1) and the raft foundation layer (3).
13. Dewatering well plugging structure according to claim 11, characterized in that the upper port of the dewatering well (1) is provided with a closing plate (13), the outer edge of the closing plate (13) is fixed on the inner wall of the dewatering well (1).
14. A dewatering well plugging structure according to claim 11, characterized in that the waterproof layer (4) comprises a waterproof paint layer group (41) coated on the cushion layer (21) and a waterproof coiled material (42) laid on the waterproof paint layer group (41); the waterproof coating layer group (41) comprises a cement-based permeable crystallization type waterproof coating (411) and/or an uncured rubber asphalt waterproof coating (412).
15. A dewatering well plugging structure according to claim 14, characterized in that a water stopping collar (14) is sleeved at the position where the outer edge of the dewatering well (1) contacts with the waterproof coiled material (42).
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Cited By (1)
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| CN114427233A (en) * | 2022-03-01 | 2022-05-03 | 中国建筑第八工程局有限公司 | Precipitation wellhead plugging device and construction method thereof |
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