CN112144584A - Self-flowing drainage pressure-limiting anti-floating structure and construction method - Google Patents
Self-flowing drainage pressure-limiting anti-floating structure and construction method Download PDFInfo
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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
- E02D31/10—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 soil pressure or hydraulic pressure
- E02D31/12—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 soil pressure or hydraulic pressure against upward hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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Abstract
The invention discloses a self-flowing drainage pressure-limiting anti-floating structure and a construction method, wherein the self-flowing drainage pressure-limiting anti-floating structure is an active anti-floating structure consisting of a water permeable system, a water collecting system, a drainage system and a monitoring control system; the system that permeates water filters soil particles in the soil layer and makes the pressure water assemble to the water collecting system in, the water conservancy diversion is gone into drainage system, monitoring control system is according to resistance and water buoyancy relation, and the real-time regulation and control of basement displacement volume is drained, control basement pressure flood peak, utilizes the place relief to lay gravity flow pipeline and arranges municipal pipe network or cistern to, and this anti-floating structure arranges outside the waterproof layer of underground building construction and is convenient for be under construction and maintain, has realized the dynamic balance of water buoyancy and resistance. The invention has the advantages of effective anti-floating, simple construction, economy and environmental protection, effectively solves the problems of safety, sustainable development and environmental protection of underground structure anti-floating, and provides powerful technical support for underground space development.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a self-flowing drainage pressure-limiting anti-floating structure and a construction method.
Background
With the continuous development and utilization of urban underground space, the floating accidents of underground building/structure basements occur sometimes, which causes great social influence and economic loss. How to economically and effectively solve the anti-floating problem of the underground structure becomes one of the hot spots and key points in the development process of the underground space. At present, the anti-floating design of underground structures in various countries mostly adopts an anti mode design, for example, anti-floating structures such as dead weight increasing methods, anti-pulling piles or anti-pulling anchor rods are adopted, so that the cost is too high and the safety risk is high. The drainage pressure limiting technology adopts the 'releasing' idea to process the water buoyancy, and is an anti-floating method with simple construction and good economical efficiency.
However, the existing active anti-floating technology mainly has the following problems: 1) the water collecting pit is arranged in the basement, so that the basement is wet, and meanwhile, the risk of water overflowing from the water collecting pit exists; 2) the water drainage pipe penetrates through the waterproof layer, the construction difficulty is high, and water is easy to seep at the joint; 3) the water is continuously pumped and drained in the operation period, and a large amount of energy is consumed; 4) large amount of discharged underground water causes settlement of the surrounding earth surface and destruction of nearby buildings; 5) the anti-buoyancy force provided by the building structure cannot be monitored, and only the variable load and the side wall frictional resistance can be neglected conservatively, so that the waste of partial engineering anti-buoyancy design is remarkable; 6) structural damage caused by unsmooth drainage, and the like. Due to the defects, the field needs to be further perfected and improved, and a self-flowing drainage pressure-limiting anti-floating structure suitable for underground constructions/structures is designed to meet the anti-floating stability of the self-flowing drainage pressure-limiting anti-floating structure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automatic-flow drainage pressure-limiting anti-floating structure and a construction method, so that limited drainage is realized, underground water resources are saved, and the purpose of pressure limitation is achieved.
In order to achieve the purpose, the invention adopts the technical scheme that: a self-flowing drainage pressure-limiting anti-floating structure comprises a water permeable system, a water collecting system, a drainage system and a monitoring control system; the system comprises a water permeable system, a water collecting system, a drainage system, a monitoring and control system and a municipal pipe network or reservoir, wherein the water permeable system and the water collecting system are arranged at the bottom of an underground building, the drainage system is connected to the water collecting system, the water permeable system filters soil particles in a soil layer to enable pressure water to be gathered in the water collecting system and guided into the drainage system, the monitoring and control system is used for monitoring the stress and floating condition of the underground building and controlling the drainage system and the drainage system to discharge underground water in real time according to the stress and floating condition so as to control the base pressure, and the drainage system is a gravity flow pipeline arranged by using the height difference of the terrain of the site and.
Optionally, the water permeable system comprises a filter layer, a water guide layer arranged on the upper layer of the filter layer, and an isolation layer arranged on the upper layer of the water guide layer; the filter layer is made of geotextile, and is continuously and smoothly laid and has a flat surface; the water guide layer is made of gravels or gravels with the particle size of 10-20 mm, and the thickness of the water guide layer is not less than 300 mm; the isolation layer is an isolation film for preventing concrete slurry from permeating into the water guide layer when the foundation slab is poured.
Optionally, the water collecting system is located between the filter layer and the water guide layer, and the water collecting system includes a horizontal water collecting pipe network composed of a plurality of porous polyvinyl chloride pipes uniformly arranged along the longitudinal direction and the transverse direction of the bottom of the underground building.
Optionally, the drainage system includes the drainage corridor, the drainage corridor is followed be cyclic annular arrangement around the underground building lateral surface, and the embedding degree of depth is less than the position that the basement flood head can be resisted to the anti buoyancy of drainage corridor, groundwater along the drainage corridor flows to municipal pipe network or cistern by oneself.
Optionally, the drainage corridor is an overhanging structure which is arranged on the side of the underground building and covered with soil on the upper part.
Optionally, the monitoring and controlling system comprises a structural anti-buoyancy monitoring unit, a basement displacement monitoring unit and a drainage valve chamber, which are respectively used for monitoring anti-buoyancy force, buoyancy force and basement displacement of the underground building and controlling the working state of drainage equipment; the drainage valve chambers are distributed in a dotted manner along the peripheral side of the underground building and are respectively positioned between the underground building and the drainage system to connect the water collection system and the drainage system.
Optionally, the indoor drain pipe that is equipped with the arch over to the top of drain valve, the one end of drain pipe with water collecting system's play water end is connected, the other end with drainage system connects, be equipped with flowmeter, ooff valve, check valve on the drain pipe.
And, a construction method of the self-flowing drainage pressure-limiting anti-floating structure, comprising the following steps:
digging a foundation pit, and laying a filter layer on the base of the foundation pit;
laying a horizontal water collecting pipe net on the upper layer of the filter layer;
arranging a monitoring control system for monitoring the stress condition and the floating condition of an underground building and debugging the monitoring control system;
laying a water guide layer and an isolation layer on the upper layer of the water collecting pipe network in sequence;
carrying out civil construction of a drainage gallery and a drainage valve chamber on the periphery of an underground building;
construction of installation engineering of a drainage valve chamber;
and performing pipeline connection and water testing in the drain valve chamber.
Optionally, in the step of digging the foundation pit, the 20cm earthwork is reserved when the mechanical excavation reaches the design elevation, the artificial excavation is adopted to ensure that the foundation layer of the foundation pit is not disturbed and damaged, when the excavation exceeds the elevation, gravel, broken stone or medium-coarse sand is used for filling and compacting, and then the filter layer is laid.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the drainage system is arranged below the periphery of the building and the foundation slab, the anti-floating structures are arranged outside the waterproof layer, construction is convenient, the sealing performance of the waterproof layer is guaranteed, and meanwhile, the interference to the normal operation of the building caused by the maintenance of the anti-floating structures is avoided.
2. And the height difference of the ground topography is utilized, so that the self-flowing drainage is realized, and the energy is saved.
3. The monitoring control system monitors the anti-buoyancy force, the structural displacement and the underground water condition, takes the beneficial effect of variable load into consideration, and exerts the side wall frictional resistance. The method is provided for the first time to monitor and prejudge the stability of the anti-floating according to the floating displacement of the base bottom plate, and can exert the side wall frictional resistance and the anti-pulling force of the anti-pulling component under the condition of allowing the generation of proper displacement.
4. The anti-floating structure dynamically regulates and controls water drainage pressure limitation, water is not drained when the anti-floating stability can be met, and a large amount of underground water resources are saved.
5. The drainage gallery is ingeniously arranged into an overhanging structure with certain structural strength, and the anti-floating capacity of the structure is enhanced by means of the self weight of the overhanging structure and the upper portion soil covering.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of a gravity flow drainage pressure-limiting anti-floating structure (form one) according to the present invention;
FIG. 2 is a schematic cross-sectional view of a gravity drainage pressure-limiting anti-floating structure (form two) according to the present invention;
FIG. 3 is a schematic cross-sectional view of a water guiding layer of the gravity drainage pressure-limiting anti-floating structure of the invention;
FIG. 4 is a cross-sectional view of the self-drainage pressure-limiting anti-floating structure of the invention combined with other anti-floating components on a sloping field;
FIG. 5 is a schematic cross-sectional view of the drainage gallery of the gravity drainage pressure-limiting anti-floating structure of the present invention, which is also used as an overhanging structure;
fig. 6 shows a construction flow chart of the gravity drainage pressure-limiting anti-floating structure of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 1 and fig. 2, as an alternative embodiment, the gravity drainage pressure-limiting anti-floating structure consists of a water permeable system, a water collecting system, a drainage system and a monitoring control system; the system that permeates water makes the pressure water assemble among the water collecting system in filtering soil layer to through the water collecting system water conservancy diversion income drainage system, monitoring control system regulates and control the drainage in real time according to anti buoyancy and water buoyancy relation, the displacement volume that floats on the basement, control basement pressure flood peak, drainage system utilizes the place relief to lay gravity flow pipeline and arranges municipal pipe network or cistern 15, this anti-floating structure arranges outside the waterproof layer of secret building 17 and is convenient for be under construction and maintain, the dynamic balance of water buoyancy and anti buoyancy has been realized, anti-floating safety, sustainable development and environmental protection problem have been solved.
As an alternative embodiment, as shown in fig. 3, the water permeable system is composed of a filter layer 2, a water guiding layer 4 arranged on the upper layer of the filter layer 2, and an isolation layer 5 arranged on the upper layer of the water guiding layer 4; the filter layer 2 adopts geotextile, and is laid continuously, straightly and smoothly, and the surface is flat; the water guide layer 4 adopts gravels or broken stones, the particle size is 10-20 mm, the thickness is not smaller than 300mm, and the bearing capacity and settlement requirements of a substrate are required to be met; the isolation layer 5 is an isolation film that prevents infiltration of concrete grout when the foundation slab 14 is poured.
As shown in fig. 3, as an alternative embodiment, the water collecting system is located between the filtering layer 2 and the water guiding layer 4, and includes a horizontal water collecting pipe network 3 uniformly arranged along the longitudinal and transverse directions of the building, the water collecting pipe network 3 is composed of a plurality of porous polyvinyl chloride pipes wrapped by geotextiles, and the geotextiles wrapped outside the porous polyvinyl chloride pipes achieve a filtering effect to prevent impurities from entering the pipes to cause blockage. The seepage of the underground water gathers the underground water into the water guide layer 4, and the underground water is gathered into the water collecting pipe network 3 through the water guide layer 4, so that the water collecting effect of the water collecting pipe network 3 is better. The filtering layer 2 laid below the water collecting system is used for filtering out impurities in the underground water permeating into the water guide layer 4 or the water collecting pipe network 3.
As an alternative embodiment, as shown in fig. 1 and 2, the drainage system consists of a drainage corridor 1, a spare suction pump and an early warning device; the drainage corridor 1 is independent of the building, and is convenient to maintain and overhaul; the drainage gallery 1 is annularly arranged along the periphery of the building, the drainage gallery 1 is a gravity flow pipeline arranged by utilizing the height difference of the site terrain and is communicated to a municipal pipe network or a reservoir 15 to guide underground water to automatically flow to the municipal pipe network or the reservoir 15 at a low position, the embedding depth of the drainage gallery 1 can be consistent with the elevation of the base of the underground building 17, and can also be above the base of the underground building 17, the embedding depth is required to be lower than the position of the drainage gallery, which can resist a water head, and is determined according to the site terrain and the pressure value of drainage pressure reduction. As shown in fig. 5, and the drainage corridor 1 can double as an overhanging structure of the underground structure, its own weight and the weight of the upper casing 16 provide partial buoyancy resistance. The drainage gallery can adopt cast-in-place concrete, a prefabricated concrete structure, a glass fiber reinforced plastic sand inclusion pipe, a high-density polyethylene pipe and the like. Under the condition that the drainage gallery 1 is blocked and the drainage quantity of the drainage gallery 1 is insufficient, the early warning device gives an alarm, a standby water suction pump can be started to pump water, and the drainage efficiency is improved.
As shown in figure 4, as a more preferred embodiment, the drainage corridor 1 utilizes a gravity flow pipeline arranged on the height difference of the field topography and discharges the gravity flow pipeline to a municipal water well or a reservoir, thereby saving energy, reducing the buoyancy by the gravity flow drainage under the condition that the height difference of the field topography is limited, and the self weight of the structure can not resist the buoyancy, and ensuring the anti-floating stability by combining with other anti-floating measures. In this embodiment, a plurality of uplift members 18 are buried in the bottom of the underground structure 17 to increase the buoyancy resistance.
The monitoring control system consists of a structure anti-buoyancy monitoring unit, a substrate displacement monitoring unit, a site underground water level monitoring unit and a drainage valve chamber 6, and is respectively used for monitoring anti-buoyancy, substrate displacement, site underground water level and controlling the working state of drainage equipment on an underground building 17. The anti-floating force monitoring content comprises the following contents: the structure dead weight, the overhanging structure dead weight, the upper part weight load, the pulling resistance of the pulling resistance component 18 and the side wall friction force; the drainage valve chambers 6 are distributed in a dot shape along the building, connect the water guide system with the drainage system, start and stop drainage according to the relation between buoyancy and anti-buoyancy and the floating displacement on the substrate, and realize the function of regulating and controlling the pressure head of the substrate.
According to the displacement monitoring unit, the upward floating displacement of the base bottom plate of the underground building 17 is monitored, the anti-floating stability is monitored and pre-judged, the side wall friction resistance and the anti-pulling force of the anti-pulling member 18 can be exerted under the condition that proper displacement is allowed to be generated, and when the side wall resistance, the pressure and the anti-pulling pile cannot resist the buoyancy, the drainage structure in the drainage valve chamber 6 is regulated and controlled again, so that the underground water is drained and the buoyancy is reduced.
The buoyancy force of water is calculated according to the pore water pressure and the stress area of the substrate, the anti-buoyancy force comprises the dead weight of the structure and the overhanging structure, the weight of the upper part, the anti-pulling force of the anti-pulling member 18 and the side wall frictional resistance, and the anti-buoyancy force is calculated by combining the monitoring results of a substrate pressure gauge, a side wall area pressure gauge, a steel bar stress gauge and the like with the empirical coefficient. The floating amount is the floating deformation amount measured by a monitoring instrument arranged on the substrate and the side wall structure. The monitoring item sets a reasonable limit interval according to theoretical calculation, regional experience and the surrounding environment, so that accidents caused by transmission of error data due to instrument faults are avoided.
The current national standard anti-floating checking calculation is not used for variable load and side wall frictional resistance, mainly because the two items are greatly influenced by the use condition, the side wall interface material and the backfill quality of the fertilizer groove, and a constant value is difficult to set.
The drainage valve chamber 6 is internally provided with a drainage pipe, one end of the drainage pipe is connected with the water outlet end of the water collecting pipe network 3 in the water collecting system, the other end of the drainage pipe is connected with the drainage system, the drainage pipe is provided with a flow meter 8, a switch valve 10 and a check valve 9, in the embodiment, the drainage pipe is an arched drainage pipe 19 arched upwards, the pressure of the substrate water is regulated and controlled by the arched drainage pipe 19, the groundwater in the water collecting system is prevented from flowing out completely, the purpose of controlling the buoyancy is achieved only by discharging a proper amount of groundwater, the anti-floating requirement of the structure is met, and the groundwater is drained in a proper. Preferably, the arched drainpipe 19 is further provided with an exhaust valve 7 for exhausting gas from the groundwater to accelerate the groundwater exhaust rate, and the exhaust valve 7 is provided at the top end of the arched drainpipe 19 so that the groundwater is inevitably exhausted from the exhaust valve 7.
As a more preferable embodiment, as shown in fig. 1 or fig. 2, the drainage pipe in the drainage valve chamber 6 includes a straight pipe 12, one end of the straight pipe 12 is connected to the water outlet end of the water collecting pipe network 3 in the water collecting system, and the other end is communicated to the inside of the drainage gallery 1, the straight pipe 12 is provided with an emergency valve 11 and a flow meter 8, the straight pipe 12 is provided with a branch pipe which is arched upwards to form an arched drainage pipe 19, and both ends of the arched drainage pipe 19 are respectively communicated with the straight pipe 12 on both sides where the emergency valve 11 is arranged. When water flow is discharged into the drainage gallery 1 from the arched drainage pipe 19 or the straight flow pipe 12, the water flow amount flowing out can be counted through the flow meter 8, so that the opening and closing of the valve can be regulated and controlled as required, and the regulation and control of the water discharge amount are further realized. When the underground water drainage system is used and a small amount of water in the water collection system needs to be drained in a general situation, the switch valve 10 and the check valve 9 on the arched drainage pipe 19 are opened, so that water flows from the arched drainage pipe 19 to the drainage gallery 1, and the underground water is not drained completely. When the precipitation is great, and the basement infiltration volume is more, and anti floating unfavorable condition such as required groundwater discharge is more, open emergency valve 11 on the straight flow pipe 12 for drainage efficiency is higher.
The top of drainage valve chamber 6 is equipped with the access hole 13 that exposes in the earth's surface, makes things convenient for the maintainer to get into drainage valve chamber 6 through access hole 13 and inspects and repairs, and the drainage valve chamber 6 of locating the side makes things convenient for the maintainer to get into, locates the anti structure of floating of underground building 17 bottom and more conveniently overhauls in comparing in other designs, and can not lead to the fact destruction to underground building 17's foundation slab 14.
Because the anti problem of floating of building underground structure contains whole anti problem of floating and local anti problem of floating, when its whole anti superficial satisfies the demands, local water pressure too high also can cause the local destruction of structure, evenly arranges that the too high adverse effect of local water pressure can be avoided in anti weak position of floating, should do the experiment of watering and lead to the water experiment before the pipeline is buried underground, and the drainage should be unblocked, and is not blockked up, does not have the seepage. When the drainage pressure relief technology is adopted for design and analysis, the drainage capacity of a drainage system is far greater than that of underground water seeping into a substrate, the substrate cannot form large water pressure, and the purpose of controlling the water buoyancy below the foundation bottom plate 14 to meet the design requirement is achieved.
The anti-floating defense partition is divided according to factors such as ground elevation, base elevation, structural load, anti-pulling force of the anti-pulling component 18, side wall frictional resistance and the like in the sloping field, the drainage design partition is further divided according to drainage conditions, basement burial depth, side wall interface contact conditions, the anti-pulling component 18 and the like, and the drainage valve chamber 6 controls the base water head of the partition according to the conditions of the partitions respectively to meet the overall and local anti-floating requirements. One or more drainage valve chambers 6 are distributed in each drainage design partition, and according to the water buoyancy and anti-buoyancy and the indexes of the displacement amount of the water floating on the base, the drainage valve chambers 6 control the underground water in the water collecting system to be drained into the drainage system to regulate and control the water buoyancy in real time, so that the base water head control of each drainage design partition is realized, and the integral and local anti-floating stability of the building structure is met.
The anti-floating structure needs to be designed and calculated and then put into use so as to ensure the anti-floating effect. The design calculation includes: the infiltration amount of the soil layer at the bottom of the foundation, the water drainage amount of the water guide layer 4, the water drainage amount of the porous polyvinyl chloride pipe and the water drainage amount of the water drainage system ensure that the water drainage amount is more than 10 times of the infiltration amount, and the durability of the material is the same as that of the main structural member.
When the structure is used, the filter layer 2 filters soil particles in a soil layer to enable a large amount of pressure water to be gathered in the water guide layer 4, the pressure water flows into the water collecting pipe network 3 through the water guide layer 4, flows into the drainage valve chamber 6 through the water collecting pipe network 3 and then flows into the drainage gallery 1 through the drainage valve chamber 6, a base pressure water head is controlled, the gravity flow pipeline is arranged by utilizing the height difference of the terrain of a site and is drained to a municipal well or a reservoir, the dynamic balance of water buoyancy and anti-buoyancy is realized, and the problems of anti-buoyancy safety, sustainable development and environmental protection are solved.
Under the general condition, the dead weight of the building structure and the uplift pile can overcome the upward buoyancy generated by certain water pressure of the base, when the dead weight of the building and the buoyancy of the base cannot be resisted by other anti-floating structures, underground water is discharged under the action of the water collecting system, the drainage valve chamber 6 and the drainage gallery 1, the water pressure of the base is reduced, the underground water in the water collecting system is discharged into the drainage gallery 1 and flows into a municipal well or a reservoir until the underground building 17 can keep anti-floating stability by the dead weight and other anti-floating components, and the drainage is stopped, so that the purposes of limited drainage, saving of underground water resources and pressure limiting are achieved.
As shown in fig. 6, a construction method of a self-flowing drainage pressure-limiting anti-floating structure comprises the following steps:
firstly, digging a foundation pit, arranging the foundation pit, and paving a filter layer 2 on the base of the foundation pit;
retaining 20cm of earthwork when the foundation pit is mechanically excavated to the designed elevation, adopting manual excavation to ensure that a foundation pit foundation layer is not disturbed and damaged, when the excavation exceeds the elevation, loosening soil or backfilling with impermeable materials, filling and compacting with gravels, gravels or medium-coarse sand, and then laying a filter layer 2
Secondly, laying a horizontal water collecting pipe net 3 on the upper layer of the filter layer 2;
the horizontal water collecting pipe network 3 is formed by uniformly arranging a plurality of porous polyvinyl chloride pipes wrapped by geotextile along the longitudinal direction and the transverse direction above the filter layer 2.
Step three, arranging a monitoring control system for monitoring the stress condition and the floating condition of the underground building 17 and debugging the monitoring control system;
the device comprises a substrate buoyancy monitoring unit, a substrate displacement monitoring unit, an anti-buoyancy monitoring unit and a site underground water level monitoring unit.
Laying a water guide layer 4 and an isolation layer 5 on the upper layer of the water collecting pipe network 3 in sequence;
the water guide layer 4 is paved by gravels or broken stones, the particle size is 10-20 mm, and the paving thickness is not less than 300 mm. The isolation layer 5 adopts an isolation film to play a role in waterproof isolation.
And fifthly, constructing civil constructions of an underground building 17, a drainage gallery 1 and a drainage valve chamber 6 on the underground building 17 above the isolation layer 5.
And step six, mounting engineering construction of the drainage valve chamber 6.
Connecting pipelines and testing water;
in the steps, the drainage gallery 1 is well positioned and laid before earthwork construction and masonry, so that the size, position, depth and gradient of the drainage gallery 1 are ensured to meet the design requirements. The construction of the drain gallery 1 should meet the regulations of the design and the current relevant standards of the country. The water guide pipe is arranged in the drainage gallery 1, and the material, the model, the installation length and the installation position of the water guide pipe all meet the design requirements. The installation position is determined by the elevation and the plane position of the water outlet of the water guide pipe, and then the water guide pipe is fixed by adopting reliable measures, so that the position of the water guide pipe after concrete pouring meets the design requirement.
And step eight, finishing the construction of the drainage pressure-limiting anti-floating structure.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A self-flowing drainage pressure-limiting anti-floating structure is characterized by comprising a water permeable system, a water collecting system, a drainage system and a monitoring control system; the system comprises a water permeable system, a water collecting system, a drainage system, a monitoring and control system and a municipal pipe network or reservoir, wherein the water permeable system and the water collecting system are arranged at the bottom of an underground building, the drainage system is connected to the water collecting system, the water permeable system filters soil particles in a soil layer to enable pressure water to be gathered in the water collecting system and guided into the drainage system, the monitoring and control system is used for monitoring the stress and floating condition of the underground building and controlling the drainage system and the drainage system to discharge underground water in real time according to the stress and floating condition so as to control the base pressure, and the drainage system is a gravity flow pipeline arranged by using the height difference of the terrain of the site and.
2. The artesian drainage pressure-limiting anti-floating structure according to claim 1, wherein the water permeable system is composed of a filter layer, a water guide layer arranged on the upper layer of the filter layer, and an isolation layer arranged on the upper layer of the water guide layer; the filter layer is made of geotextile, and is continuously and smoothly laid and has a flat surface; the water guide layer is made of gravels or gravels with the particle size of 10-20 mm, and the thickness of the water guide layer is not less than 300 mm; the isolation layer is an isolation film for preventing concrete slurry from permeating into the water guide layer when the foundation slab is poured.
3. The gravity drainage pressure limiting anti-floating structure according to claim 2, wherein the water collecting system is located between the filter layer and the water guide layer, and the water collecting system comprises a horizontal water collecting pipe network consisting of a plurality of porous polyvinyl chloride pipes uniformly arranged along the longitudinal direction and the transverse direction of the bottom of the underground building.
4. The artesian drainage pressure-limiting anti-floating structure according to claim 1, wherein the drainage system comprises a drainage gallery, the drainage gallery is annularly arranged along the periphery of the outer side surface of the underground building, the embedding depth is lower than the position where the anti-buoyancy of the drainage gallery can resist the ground water head, and underground water automatically flows to a municipal pipe network or a reservoir along the drainage gallery.
5. The gravity drainage pressure-limiting anti-floating structure according to claim 4, wherein the drainage corridor is an overhanging structure which is arranged on the side of the underground building and the upper part of which is covered with soil.
6. The gravity drainage pressure-limiting anti-floating structure according to claim 1, wherein the monitoring control system comprises a structure anti-floating force monitoring unit, a base buoyancy monitoring unit, a base displacement monitoring unit and a drainage valve chamber, which are respectively used for monitoring anti-floating force, buoyancy and base displacement of an underground building and controlling the working state of drainage equipment; the drainage valve chambers are distributed in a dotted manner along the peripheral side of the underground building and are respectively positioned between the underground building and the drainage system to connect the water collection system and the drainage system.
7. The artesian drainage pressure-limiting anti-floating structure according to claim 6, wherein a drainage pipe arched upwards is arranged in the drainage valve chamber, one end of the drainage pipe is connected with the water outlet end of the water collecting system, the other end of the drainage pipe is connected with the drainage system, and a flow meter, a switch valve and a check valve are arranged on the drainage pipe.
8. A construction method of a self-flowing drainage pressure-limiting anti-floating structure is characterized by comprising the following steps:
digging a foundation pit, and laying a filter layer on the base of the foundation pit;
laying a horizontal water collecting pipe net on the upper layer of the filter layer;
arranging a monitoring control system for monitoring the stress condition and the floating condition of an underground building and debugging the monitoring control system;
laying a water guide layer and an isolation layer on the upper layer of the water collecting pipe network in sequence;
carrying out civil construction of a drainage gallery and a drainage valve chamber on the periphery of an underground building;
construction of installation engineering of a drainage valve chamber;
and performing pipeline connection and water testing in the drain valve chamber.
9. The construction method of the gravity flow drainage pressure limiting anti-floating structure according to claim 8, characterized in that in the step of digging the foundation pit, the 20cm earthwork is kept when the mechanical excavation reaches the design elevation, the manual excavation is adopted to ensure that the foundation pit foundation layer is not disturbed and damaged, when the excavation exceeds the elevation, gravel, broken stone or medium and coarse sand is used for filling and compacting, and then the filter layer is laid.
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| CN113463696A (en) * | 2021-04-21 | 2021-10-01 | 成都四海岩土工程有限公司 | Strong permeable stratum anti-drainage combined basement anti-floating structure and control method |
| CN113585359A (en) * | 2021-06-28 | 2021-11-02 | 广州市设计院集团有限公司 | Water-carrying, float-reducing and anti-floating system and basement structure |
| CN113742826A (en) * | 2021-09-02 | 2021-12-03 | 贵州正业工程技术投资有限公司 | Active anti-floating design method based on anti-floating variable water level |
| CN113863394A (en) * | 2021-10-20 | 2021-12-31 | 金光荣 | Anti-floating monitoring control system for basement of building |
| CN114032971A (en) * | 2021-11-01 | 2022-02-11 | 浙江科技学院 | Device and method for preventing underground structure from liquefying and floating |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113463696A (en) * | 2021-04-21 | 2021-10-01 | 成都四海岩土工程有限公司 | Strong permeable stratum anti-drainage combined basement anti-floating structure and control method |
| CN113585359A (en) * | 2021-06-28 | 2021-11-02 | 广州市设计院集团有限公司 | Water-carrying, float-reducing and anti-floating system and basement structure |
| CN113742826A (en) * | 2021-09-02 | 2021-12-03 | 贵州正业工程技术投资有限公司 | Active anti-floating design method based on anti-floating variable water level |
| CN113742826B (en) * | 2021-09-02 | 2024-03-19 | 贵州正业工程技术投资有限公司 | Active anti-floating design method based on anti-floating variable water level |
| CN113863394A (en) * | 2021-10-20 | 2021-12-31 | 金光荣 | Anti-floating monitoring control system for basement of building |
| CN114032971A (en) * | 2021-11-01 | 2022-02-11 | 浙江科技学院 | Device and method for preventing underground structure from liquefying and floating |
| CN114032971B (en) * | 2021-11-01 | 2022-11-25 | 浙江科技学院 | Device and method for preventing underground structure from liquefying and floating |
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