CN109339059B - Comprehensive recycling system and construction method for foundation pit excavation backfill ramming and precipitation recharging water resources - Google Patents
Comprehensive recycling system and construction method for foundation pit excavation backfill ramming and precipitation recharging water resources Download PDFInfo
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- CN109339059B CN109339059B CN201811502665.7A CN201811502665A CN109339059B CN 109339059 B CN109339059 B CN 109339059B CN 201811502665 A CN201811502665 A CN 201811502665A CN 109339059 B CN109339059 B CN 109339059B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 517
- 238000010276 construction Methods 0.000 title claims abstract description 57
- 238000009412 basement excavation Methods 0.000 title claims abstract description 35
- 238000001556 precipitation Methods 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 189
- 239000004576 sand Substances 0.000 claims abstract description 32
- 238000005086 pumping Methods 0.000 claims abstract description 31
- 238000011049 filling Methods 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 31
- 238000009826 distribution Methods 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 11
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- 238000005056 compaction Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 125000004122 cyclic group Chemical group 0.000 claims description 4
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- 238000009933 burial Methods 0.000 claims description 3
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- 238000007689 inspection Methods 0.000 claims description 3
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- 230000035699 permeability Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
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- 229910000831 Steel Inorganic materials 0.000 claims description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/20—Restraining of underground water by damming or interrupting the passage of underground water by displacing the water, e.g. by compressed air
Abstract
The invention discloses a foundation pit excavation backfill ramming and precipitation recharging water resource comprehensive recycling system and a construction method, wherein the system comprises the following components: the device comprises a foundation pit groove, backfill, a well point pipe, a water collecting main pipe, a vacuum main pipe, a water supply pipe, a main water storage tank, a support, a transmission pipe, at least one secondary water storage tank, a circulating water interface, a water outlet switch, a recharging pipe, a variable-frequency booster pump and a drainage pipeline network, wherein the top of the main water storage tank is provided with a water inlet, the bottom of the main water storage tank is provided with a first water outlet, the top of the side wall of the main water storage tank is provided with a second water outlet, the support is used for supporting the main water storage tank and the secondary water storage tank, the transmission pipe is provided with at least one secondary water storage tank, the circulating water interface is arranged on the secondary water storage tank and used for supplying engineering construction or facility water and municipal fire protection system water, the water outlet switch is arranged on the circulating water interface, the recharging pipe is arranged on the recharging pipe, and the variable-frequency booster pump is arranged on the recharging pipe, and the drainage pipeline network is arranged on two sides of the foundation pit groove; the construction method comprises the following steps: 1) well point arrangement and burying, 2) system facility installation and trial pumping, 3) trench excavation and pipeline construction, 4) recharging and sand-shaking tamping backfilling. According to the invention, well point dewatering of a foundation pit is used for trench backfilling and water filling, water sand compacting and backfilling, engineering construction or facility water and municipal fire-fighting system water, so that water resources are comprehensively recycled.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a foundation pit excavation, backfill compaction and precipitation recharging water resource comprehensive recycling system and a construction method.
Background
The well point dewatering is to embed a certain number of water filtering pipes (wells) around the trench of the foundation pit before the foundation pit is excavated, and the water level of the foundation pit is reduced by pumping water by using pumping equipment to achieve dry construction. In the construction process of a municipal pipeline groove (foundation pit) near a river, the problems caused by seepage deformation such as piping, sand flowing and the like are frequently encountered, so that the pipeline groove is difficult to construct. The dry construction can be achieved by adopting a well point dewatering method, and smooth excavation of the groove (foundation pit) is ensured. The water sand compacting process is a process for compacting the foundation, and is used for compacting the backfill soil under the downward seepage force of water flow and the vibration action of equipment by injecting water into the backfill soil of the groove, so that the process is applied to backfill compaction of the groove.
The conventional well-point dewatering process is difficult to effectively recycle after groundwater is extracted, and water is continuously injected into the soil when the backfill soil is compacted by using water-shocked sand, so that a great amount of water resources are wasted by one row of injection. Meanwhile, the ground surface subsidence outside the trench is aggravated due to the rapid and large extraction of the ground water, the balance of the supply relation of the surrounding water system is also influenced, the surrounding ecological environment is destroyed, and the engineering progress is seriously lagged.
Disclosure of Invention
Aiming at the problems, the invention provides a comprehensive treatment and recycling system for water resources, which uses well point precipitation of a foundation pit for trench backfilling and water filling, water sand compacting and tamping backfilling and engineering construction or facility water and municipal fire-fighting system water, so that the water resources are most effectively utilized.
The invention is realized by the following technical scheme.
Foundation ditch excavation backfill tamps and precipitation recharging water resource comprehensive cyclic utilization system, its characterized in that includes: the device comprises a foundation pit groove, backfill, a well point pipe, a water collecting main pipe, a vacuum main pipe, a water supply pipe, a main water storage tank, a support, a transmission pipe, at least one secondary water storage tank, a circulating water interface, a water outlet switch, a recharging pipe, a variable-frequency booster pump and a drainage pipeline network, wherein the top of the main water storage tank is provided with a water inlet, the bottom of the main water storage tank is provided with a first water outlet, the top of the side wall of the main water storage tank is provided with a second water outlet, the support is used for supporting the main water storage tank and the secondary water storage tank, the transmission pipe is provided with at least one secondary water storage tank, the circulating water interface is arranged on the secondary water storage tank and used for supplying engineering construction or facility water and municipal fire protection system water, the water outlet switch is arranged on the circulating water interface, the recharging pipe is arranged on the recharging pipe, and the variable-frequency booster pump is arranged on the recharging pipe, and the drainage pipeline network is arranged on two sides of the foundation pit groove;
the well point pipes are buried into the underground aquifer along the two sides of the foundation pit groove according to a certain interval; one end of the water collecting main pipe is connected with the well point pipe, and the other end of the water collecting main pipe is connected with a water inlet of the vacuum host; the water outlet of the vacuum host is connected with the water inlet at the top of the main water storage tank through a water supply pipe; the second water outlet of the main water storage tank is connected with the bottom of the secondary water storage tank through a conveying pipe; the first water outlet of the main water storage tank is communicated with a drainage pipeline network through a recharging pipe provided with a variable-frequency pressurizing pump.
As a preferable technical scheme, the support is a reinforcing steel bar support.
As the preferable technical scheme, the height of the main water storage tank from the ground is 1000-1500 mm, and the height of the secondary water storage tank from the ground is 600mm smaller than that of the main water storage tank.
As the preferable technical scheme, the main water storage tank and the secondary water storage tank are respectively recyclable stainless steel water tanks.
As a preferable technical scheme, the main water storage tank and the secondary water storage tank adopt water storage tanks with the same volume; the single-day maximum drainage amount of the vacuum main machine, the volume and the number of the secondary water storage tank meet the following requirements:
wherein V is the volume of the secondary water storage tank, Q is the single-day maximum drainage of the vacuum main machine, and n is the number of the secondary water storage tanks.
As the preferable technical scheme, the drainage pipeline network adopts a pipeline with the diameter of phi 15cm, drainage holes with the diameter of 0.8-1.5 cm are uniformly distributed on the pipeline every 8-15 cm, and the filter screen is wrapped at the drainage holes.
The construction method for excavation, backfill and tamping of the foundation pit and comprehensive cyclic utilization of precipitation and recharging water resources is characterized by comprising the following steps:
1) Well point arrangement and burying: leveling a site, arranging holes at well points, positioning the holes at the well points, sinking the well point pipes, and connecting the well point pipes with a water collecting main pipe;
the step of connecting the well point pipe and the water collecting main pipe is as follows: flushing well point pipes one by one before installation, and then connecting the well point pipes with one end of a water collecting main pipe; then connecting the other end of the water collecting main pipe with a water inlet of the vacuum host;
2) Installing system facilities and pumping water in trial mode: paving a system pipeline, installing a water storage tank, connecting system facilities, sealing the pipeline, installing a control circuit and performing water pumping test;
the step of connecting the well point pipe and the water collecting main pipe is as follows: installing a vacuum host, a variable-frequency pressurizing pump, a water supply pipe, a conveying pipe, a variable-frequency pressurizing pump, a recharging pipe and a drainage pipeline network;
the step of installing the water storage tank is as follows: the main water storage tank and the secondary water storage tank are arranged at the position 400-600 m away from the foundation pit groove, and the specification and the number of the main water storage tank and the secondary water storage tank are determined according to the size of the water inflow of the foundation pit designed at the well point; the bottoms of the main water storage tank and the secondary water storage tank are provided with supports, so that the ground clearance of the main water storage tank is 1000-1500 mm, and the ground clearance of the secondary water storage tank is 500mm less than that of the main water storage tank;
the steps of the connection of the system facilities are as follows: the water outlet of the vacuum host is connected with the water inlet at the top of the main water storage tank through a water outlet pipe; the second water outlet of the main water storage tank is connected with the bottom of the secondary water storage tank through a conveying pipe; a first water outlet of the main water storage tank is communicated with a drainage pipeline network through a recharging pipe provided with a variable-frequency pressurizing pump;
3) Groove excavation and pipeline construction: pumping water, excavating a groove, reinforcing a slope toe, constructing a pipeline and performing a water closing experiment;
the water pumping step comprises the following steps: adjusting the vacuum degree of the vacuum host to be consistent with the precipitation depth, simultaneously opening a valve of a water supply pipe, closing a valve of a recharging pipe, supplying water to the main water storage tank and the secondary water storage tank, and opening a water outlet switch after a certain water storage capacity is reached, so as to supply engineering construction or facility water and municipal fire-fighting system water through a circulating water interface;
4) Recharging and water sand compacting, tamping and backfilling: the method comprises the steps of trench layered backfilling, recharging, sand compacting by water, effect measurement and compactness detection;
the recharging step comprises the following steps: after the grooves are backfilled and leveled in a layered manner, a recharging pipe valve is opened, a water pump is pumped to a drainage pipeline network for recharging, the pumping pressure of a variable-frequency pressurizing pump is regulated to control the recharging water flow rate, and the normal work of well point dewatering is always kept in the process.
As a preferable technical scheme, the construction method comprises the following steps:
1) Well point arrangement and burial
a. Leveling site and well point hole distribution positioning: according to the well point design, well point hole distribution positioning is carried out;
b. hole forming at well points: drilling holes at the positions where holes are distributed at well points, wherein the depth of the holes is 0.5m lower than the design depth;
c. sinking well point pipe: immediately inserting a well point pipe to prevent hole collapse after the well point is drilled, and wrapping a double-layer filter screen by the filter Shui Jingguan; the lower end of the well point pipe is manufactured into a flower pipe within the range of 0.8-1.5 m, pebbles are backfilled outside the pipe, clay is filled and sealed within the range of 0.8-1.2 m from the top;
d. connecting the well point pipe and the water collecting main pipe: flushing well point pipes one by one before installation, and then connecting the well point pipes with one end of a water collecting main pipe by adopting a bent plastic pipe; then connecting the other end of the water collecting main pipe with a water inlet of the vacuum host;
2) System facility installation and water trial pumping
a. Laying a system pipeline: installing a vacuum host, a variable-frequency pressurizing pump, a water supply pipe, a conveying pipe, a variable-frequency pressurizing pump and a recharging pipe;
b. and (3) installing a water storage tank: the main water storage tank and the secondary water storage tank are arranged at the position 400-600 m away from the foundation pit groove, and the specification and the number of the main water storage tank and the secondary water storage tank are determined according to the size of the water inflow of the foundation pit designed at the well point; the bottoms of the main water storage tank and the secondary water storage tank are provided with supports, so that the ground clearance of the main water storage tank is 1000-1500 mm, and the ground clearance of the secondary water storage tank is 500mm less than that of the main water storage tank;
c. connection of system facilities: the water outlet of the vacuum host is connected with the water inlet at the top of the main water storage tank through a water outlet pipe; the second water outlet of the main water storage tank is connected with the bottom of the secondary water storage tank through a conveying pipe; the first water outlet of the main water storage tank is communicated with a drainage pipeline network through a recharging pipe provided with a variable-frequency pressurizing pump;
d. and (3) sealing a pipeline: in the process of connecting different pipelines, the joint pore is blocked by glue, and the connecting part is bound by a film;
e. installing a control circuit and performing water pumping test;
3) Trench excavation and pipeline construction
a. Pumping water: adjusting the vacuum degree of the vacuum host to be consistent with the precipitation depth, simultaneously opening a valve of a water supply pipe, closing a valve of a recharging pipe, supplying water to the main water storage tank and the secondary water storage tank, and opening a water outlet switch after a certain water storage capacity is reached, so as to supply engineering construction or facility water and municipal fire-fighting system water through a circulating water interface;
b. groove excavation: the water pumping is ensured to be continuously carried out for 24 hours in the construction process of the foundation pit groove, so that the dry construction of the foundation pit groove is ensured; the foundation pit trench is excavated in a layered manner, and a 20cm reserved soil layer is reserved at the bottom of the trench;
c. slope toe reinforcement: grouting reinforcement and water sealing treatment are carried out on the position with instability on the pebble layer with strong water permeability at the bottom of the foundation pit groove;
d. and (3) pipeline construction: detecting whether the bearing capacity of the bottom surface of the foundation pit groove is qualified or not through a standard penetration test, and performing pipe foundation construction in time after the bearing capacity of the bottom surface of the foundation pit groove is more than 120 Kpa;
e. closing water experiment: when the pipeline is installed and the appearance quality of the pipeline and the inspection well are qualified, immediately performing a water closing test;
4) Backfill and water sand compacting ramming backfill
a. Groove layered backfilling: after the excavation of the foundation pit groove is completed, carrying out layered backfilling on the groove;
b. recharging: after the grooves are backfilled and leveled in a layered manner, a valve of a recharging pipe is opened, a water pump is pumped to a drainage pipeline network for recharging, the pumping pressure of a variable-frequency pressurizing pump is regulated to control the recharging water flow rate, and normal work of well point dewatering is always kept;
c. compacting sand by water: the water is refilled all the time in the sand shaking process, and the water level of the refill water is kept slightly higher than the backfilled gravel surface so as to ensure full water injection; carrying out point distribution vibration after filling water, wherein the average distance between the point distribution is not more than 50cm, and carrying out vibration from two sides of the pipeline to the edge until the pipeline is compact;
d. and (3) measuring the effect: in the process of water sand shaking, the descending depth of the surface of backfill gravel is measured in time, and the effect of water sand shaking and tamping is measured after the water sand shaking and tamping are performed for a certain time;
e. detecting compactness: stopping pouring water after reaching the compaction requirement, then detecting the compactness, carrying out backfilling construction of lower gravel after meeting the specification and the design requirement, and continuing filling and vibrating according to the method until reaching the design elevation.
As a preferable technical scheme, in the step of positioning the leveling site and the well point hole distribution: the well point hole distribution is longitudinally arranged at a position 0.8-1.5 m outside the excavation line along the groove, and the distance between the well point hole distribution is 2.0-3.0 m.
As a preferable technical scheme, the main water storage tank and the secondary water storage tank adopt water storage tanks with the same volume; the single-day maximum drainage amount of the vacuum main machine, the volume and the number of the secondary water storage tank meet the following requirements:
wherein V is the volume of the secondary water storage tank, Q is the single-day maximum drainage of the vacuum main machine, and n is the number of the secondary water storage tanks
As the preferable technical scheme, the drainage pipeline network adopts a pipeline with the diameter of phi 15cm, drainage holes with the diameter of 0.8-1.5 cm are uniformly distributed on the pipeline every 8-15 cm, and the filter screen is wrapped at the drainage holes.
The invention has the beneficial effects that:
1) The system and the construction method combine pit excavation well point dewatering with backfill water injection sand compaction, pump water and recharge, not only tamp groove backfill, but also recharge well point water to the surrounding stratum to maintain balance of water system replenishment, thereby achieving the purpose of water recycling;
2) The system and the construction method can stably supply water to the water sand by arranging the main water storage tank and the secondary water storage tank, and can also supply water for other construction processes;
3) The system and the construction method use conventional components for manufacturing or construction, are simple to install and detach, have high recycling degree of components such as the water storage tank, the pressure type sprinkler pipeline network and the like, reduce the use cost and have higher cost performance of resource recycling.
Drawings
FIG. 1 is a schematic diagram of an elevation view of a water resource comprehensive recycling system of the present invention;
FIG. 2 is a plan view of the water resource comprehensive recycling system of the present invention;
FIG. 3 is a schematic illustration of the recycling of water resources according to the present invention;
the meaning of each mark in the above figures is: 1-foundation pit grooves, 2-backfill, 3-well point pipes, 4-water collecting main pipes, 5-vacuum main pipes, 6-water supply pipes, 7-main water storage tanks, 71-water inlets, 72-first water outlets, 73-second water outlets, 8-drainage pipeline networks, 81-drainage holes, 9-supports, 10-conveying pipes, 11-secondary water storage tanks, 12-circulating water connectors, 13-water outlet switches, 14-recharging pipes and 15-variable-frequency pressurizing pumps.
Detailed Description
The invention will now be further described by way of specific examples with reference to the accompanying drawings, in which it is pointed out that the following embodiments are merely illustrative of the invention, without limiting the scope of the invention thereto, and that all equivalents of the invention may be resorted to by those skilled in the art to which the invention pertains within the scope of the invention.
Example 1
Referring to fig. 1 and 2, the foundation pit excavation backfill ramming and precipitation recharging water resource comprehensive recycling system includes: the system comprises a foundation pit groove 1, backfill 2, a well point pipe 3, a water collecting main pipe 4, a vacuum host 5, a water supply pipe 6, a main water storage tank 7 with a water inlet 71 at the top, a first water outlet 72 at the bottom and a second water outlet 73 at the top of the side wall, a support 9 for supporting the main water storage tank 7 and a secondary water storage tank 11, a conveying pipe 10, at least one secondary water storage tank 11, a circulating water interface 12 arranged on the secondary water storage tank 11 and used for supplying engineering construction or facility water and municipal fire protection system water, a water outlet switch 13 arranged on the circulating water interface 12, a recharging pipe 14, a variable-frequency pressurizing pump 15 arranged on the recharging pipe 14, and a drainage pipeline network 8 arranged on two sides of the foundation pit groove 1;
the well point pipes 3 are buried into the underground aquifer along the two sides of the foundation pit groove 1 according to a certain interval; one end of the water collecting main pipe 4 is connected with the well point pipe 3, and the other end is connected with a water inlet of the vacuum host 5; the water outlet of the vacuum host 5 is connected with a water inlet 72 at the top of the main water storage tank 7 through a water supply pipe 6; the second water outlet 73 of the main water storage tank 7 is connected with the bottom of the secondary water storage tank 11 through a conveying pipe 10; the first water outlet 72 of the main water storage tank 7 is communicated with the drainage pipeline network 8 through a recharging pipe 14 provided with a variable-frequency pressurizing pump 15;
with the comprehensive water resource recycling system, referring to fig. 1, 2 and 3, groundwater can be pumped through the well point pipe 3 to perform vacuum well point dewatering, so that the water level of a foundation pit is reduced, and the purpose of dry construction is achieved; simultaneously, groundwater pumped through the well point pipe 3 is converged to the main water storage tank 7 through the water collecting main pipe 4; the water stored in the main water storage tank 7 is pumped into the drainage pipeline network 8 for recharging through the first water outlet 72 and the recharging pipe 14 in sequence by the variable-frequency pressurizing pump 15, and is used for groove backfilling and water filling and water sand compacting and ramming backfilling; in addition, the water stored in the main water storage tank 7 can be input into the secondary water storage tank 11 through the second water outlet 73 by the conveying pipe 10, and engineering construction or construction equipment (such as a concrete mixer, concrete sprinkling maintenance equipment and the like) and municipal fire-fighting systems can be connected by the circulating water interface 12 so as to be used for engineering construction or facility water and municipal fire-fighting system water, thereby ensuring effective utilization of water resources.
Further, in this embodiment, the support 9 is a reinforcing bar support.
Further, in order to enable the water in the main water storage tank 7 to automatically flow into the secondary water storage tank 11 after being filled, in this embodiment, the height of the main water storage tank 7 from the ground is 1000-1500 mm, and the height of the secondary water storage tank 11 from the ground is 600mm smaller than the height of the main water storage tank 7 from the ground, so that the water can be supplied to the secondary water storage tank 11 through the conveying pipe 10 by utilizing the height difference between the main water storage tank 7 and the secondary water storage tank 11 under the condition of keeping the water level stable.
Furthermore, in this embodiment, the main water tank 7 and the secondary water tank 11 are stainless steel water tanks capable of being recycled, so that the disassembly and the restoration are convenient, and the use cost is reduced.
Further, in this embodiment, the main water tank 7 and the secondary water tank 11 adopt water tanks with the same volume; the single day maximum displacement of the vacuum main 5, the volume and number of the secondary water storage tank 11 satisfy the following requirements:
where V is the volume of the secondary storage tank 11, Q is the single day maximum displacement of the vacuum main 5, and n is the number of secondary storage tanks 11.
Further, in this embodiment, the drainage pipeline network 8 adopts a pipeline with a diameter of Φ15cm, drainage holes 81 with a diameter of 0.8-1.5 cm are uniformly distributed on the pipeline every 8-15 cm, and a filter screen is wrapped at the positions of the drainage holes 81 to prevent sediment from blocking the filter holes; the drainage pipeline network 16 is fixedly arranged at two sides of the groove by using steel bars and is used for preventing the pipeline from rolling into the pit; the water outlet speed and the water outlet quantity of the drainage pipeline network 16 can be controlled by the pump pressure of the variable-frequency pressurizing pump 15, so that the filling of backfill soil of each layer of the groove is ensured to be full.
Example 2
Referring to fig. 1 and 2, the construction method for excavation, backfill and tamping of a foundation pit and comprehensive recycling of precipitation and recharging water resources comprises the following steps:
(1) Well point arrangement and burial
a. Leveling site and well point hole distribution positioning: according to the well point design, well point hole distribution positioning is carried out; specifically, a total station is adopted to carry out well point hole site survey and drawing according to a hole site plane layout diagram, and bamboo piles are adopted to carry out marking and positioning; after positioning, the protection is needed to be made to prevent damage; the well point hole distribution is longitudinally arranged at a position 0.8-1.5 m outside the excavation line along the groove, and the distance between the well point hole distribution is 2.0-3.0 m;
b. hole forming at well points: drilling by adopting a small-sized geological circulation drilling machine, wherein the diameter of a drill bit is 100mm, drilling is carried out at a well point hole distribution position, and the hole forming depth is 0.5m lower than the design depth, so that the construction of filter layer pebbles is ensured;
c. sinking well point pipe: immediately inserting the well point pipe 3 to prevent hole collapse after the well point is drilled, and wrapping a double-layer filter screen by the filter Shui Jingguan; the lower end of the well point pipe 3 is manufactured into a flower pipe within the range of 0.8-1.5 m, pebbles are backfilled outside the pipe, clay is filled and sealed within the range of 0.8-1.2 m from the top;
d. connecting the well point pipe and the water collecting main pipe: flushing the well point pipes 3 one by one before installation, then connecting the well point pipes 3 with one end of the water collecting main pipe 4 by adopting a bent plastic pipe, and sealing joint holes by using glue during connection, wherein the connection parts at the two ends of the bent plastic pipe are bound by using a film to prevent the joint leakage from affecting the water pumping effect; then the other end of the water collecting main pipe 4 is connected with the water inlet of the vacuum host 5;
(2) System facility installation and water trial pumping
a. Laying a system pipeline: a vacuum host 5, a variable frequency pressurizing pump 16, a water supply pipe 6, a conveying pipe 10, a variable frequency pressurizing pump 15, a recharging pipe 14 and a drainage pipeline network 8 are arranged; wherein, the drainage pipeline network 8 adopts a pipeline with phi of 15cm, drainage holes 81 with the diameter of 0.8-1.5 cm are uniformly distributed on the pipeline every 8-15 cm, and the positions of the drainage holes 81 are wrapped with a filter screen;
b. and (3) installing a water storage tank: the main water storage tank 7 and the secondary water storage tank 11 are arranged at the position 400-600 m away from the foundation pit groove, and the specification and the number of the main water storage tank 7 and the secondary water storage tank 11 are determined according to the water inflow of the foundation pit designed at the well point; in addition, in order to enable the water resource of the system to be more effectively recycled, the main water storage tank 7 and the secondary water storage tank 11 adopt water storage tanks with the same volume, and the single-day maximum drainage amount of the vacuum main machine 5 and the volume and the number of the secondary water storage tanks 11 meet the following requirements:
wherein V is the volume of the secondary water storage tank 11, Q is the single-day maximum drainage of the vacuum main machine 5, and n is the number of the secondary water storage tanks 11;
then arranging a support 9 at the bottoms of the main water storage tank 7 and the secondary water storage tank 11, so that the ground clearance of the main water storage tank 7 is 1000-1500 mm, and the ground clearance of the secondary water storage tank 11 is 500mm smaller than the ground clearance of the main water storage tank 7, so that water of the main water storage tank 7 can automatically flow into the secondary water storage tank 11 after being filled;
c. connection of system facilities: the water outlet of the vacuum host 5 is connected with a water inlet 72 at the top of the main water storage tank 7 through a water outlet pipe 6; the second water outlet 73 of the main water storage tank 7 is connected with the bottom of the secondary water storage tank 11 through a conveying pipe 10; the first water outlet 72 of the main water storage tank 7 is communicated with the drainage pipeline network 8 through a recharging pipe 14 provided with a variable-frequency pressurizing pump 15;
d. and (3) sealing a pipeline: in the process of connecting different pipelines, the joint pore is blocked by glue, and the connecting part is bound by a film;
e. installing a control circuit and performing water pumping test; before installation, checking whether the inner diameter and verticality of the well pipe meet the requirements or not, and then pre-wetting the pump by using clean water, checking an electrical device, and performing water pumping test; when water pumping is tried, whether air leakage, siltation and the like exist or not is checked, if the water outlet is normal or not, if the water outlet is abnormal, the water outlet can be used after maintenance;
(3) Trench excavation and pipeline construction
a. Pumping water: the vacuum degree of the vacuum host machine 5 is adjusted to be consistent with the precipitation depth, the valve of the water supply pipe 6 is opened, the valve of the recharging pipe 14 is closed, water is supplied to the main water storage tank 7 and the secondary water storage tank 11, and after a certain water storage capacity is reached, the water outlet switch 13 can be opened, and water for engineering construction or facility and municipal fire protection system is supplied through the circulating water interface 12;
b. groove excavation: the water pumping is ensured to be continuously carried out for 24 hours in the construction process of the foundation pit groove 1, so that the dry construction of the foundation pit groove 1 is ensured; the foundation pit trench 1 is excavated by adopting layered excavation, a 20cm reserved soil layer is reserved at the trench bottom, and the disturbance of the trench bottom and the direct soaking of rainwater at the trench bottom are avoided, so that the bearing capacity of the trench bottom is affected, and landslide is generated due to unstable slope body;
c. slope toe reinforcement: for the pebble layer with strong water permeability at the bottom of the foundation pit groove 1, the stability of the toe is greatly influenced by the underground water gap flow, and according to the actual condition of the site, grouting reinforcement and water sealing treatment are carried out on the unstable part;
d. and (3) pipeline construction: detecting whether the bearing capacity of the bottom surface of the foundation pit groove 1 is qualified or not through a standard penetration test, and performing pipe foundation construction in time after the bearing capacity of the bottom surface of the foundation pit groove 1 is more than 120 Kpa; specifically, a tank bottom pipe base is replaced and filled with natural graded sand, a flat base is tamped by a vibrating rammer, and a C15 concrete pipe base is poured after the compactness reaches the requirement, and the pipe base is poured twice; checking pipe joint defects after pouring of the pipe base is completed, and discharging the pipe;
e. closing water experiment: when the pipeline is installed and the appearance quality of the pipeline and the inspection well are qualified, immediately performing a water-blocking test, namely, plugging two ends of the pipeline and the branch pipes tightly, preventing water seepage, filling water into the test pipe section and soaking for at least 24 hours, and observing the water seepage condition;
(4) Backfill and water sand compacting ramming backfill
a. Groove layered backfilling: after the excavation of the foundation pit groove 1 is completed, carrying out groove layered backfilling; the backfill groove adopts middle coarse sand with reasonable grading and mud content of not more than 5 percent; in the pipe groove backfilling process, a layered filling method is adopted, the filling thickness of each layer of virtual pavement is not more than 50cm, and filling and leveling are carried out in a man-machine matching mode;
b. recharging: after the grooves are backfilled and leveled in a layered manner, a valve of a recharging pipe 14 is opened, a water pump is pumped to a drainage pipeline network 8 for recharging, the pumping pressure of a variable-frequency pressurizing pump 15 is regulated to control the recharging water flow rate, and the normal work of well point dewatering is always kept;
c. compacting sand by water: the water is refilled all the time in the sand shaking process, and the water level of the refill water is kept slightly higher than the backfilled gravel surface so as to ensure full water injection; the quincuncial point distribution vibrating is carried out after water filling is full, the vibrator is inserted, the average distance between the points is not more than 50cm, the vibrating is carried out from two sides of a pipeline to the edges, dead zones are eliminated until the blind zones are compact, and meanwhile, the vibrator is inserted into the lower layer filling soil when the upper layer filling soil is filled;
d. and (3) measuring the effect: in the process of water sand shaking, the descending depth of the surface of backfill gravel is measured in time, and the effect of water sand shaking and tamping is measured after the water sand shaking and tamping are performed for a certain time; the measuring method is that a reinforcing steel bar with the diameter of 1.3m and 20 phi is held, the bottom of the reinforcing steel bar is freely inserted into backfilling in a free falling manner 30-40 cm away from the surface of backfilling gravel, and the requirement of compaction is met when the insertion cannot be directly carried out or the insertion depth is 3-5 cm;
e. detecting compactness: stopping pouring water after reaching the compaction requirement, quickly draining the water after backfilling the surface due to the action of well-point precipitation, then detecting the compactness, backfilling the lower gravel after meeting the standard and design requirement (90%), and continuing filling and vibrating according to the method until reaching the design elevation.
Claims (8)
1. Foundation ditch excavation backfill tamps and precipitation recharging water resource comprehensive cyclic utilization system, its characterized in that includes: the device comprises a foundation pit groove (1), backfill soil (2), a well point pipe (3), a water collecting main pipe (4), a vacuum main machine (5), a water supply pipe (6), a water inlet (71) arranged at the top, a first water outlet (72) arranged at the bottom, a main water storage tank (7) provided with a second water outlet (73) arranged at the top of the side wall, a support (9) for supporting the main water storage tank (7) and a secondary water storage tank (11), a conveying pipe (10), at least one secondary water storage tank (11), a circulating water interface (12) arranged on the secondary water storage tank (11) and used for supplying engineering construction or facility water and municipal fire-fighting system water, a water outlet switch (13) arranged on the circulating water interface (12), a recharging pipe (14), a variable-frequency pressurizing pump (15) arranged on the recharging pipe (14), and a drainage pipeline network (8) arranged on two sides of the foundation pit groove (1);
the well point pipes (3) are buried into the underground aquifer along the two sides of the foundation pit groove (1) according to a certain interval; one end of the water collecting main pipe (4) is connected with the well point pipe (3), and the other end of the water collecting main pipe is connected with a water inlet of the vacuum host machine 5; the water outlet of the vacuum host 5 is connected with a water inlet (71) at the top of the main water storage tank (7) through a water delivery pipe (6); the second water outlet (73) of the main water storage tank (7) is connected with the bottom of the secondary water storage tank (11) through a conveying pipe (10); the first water outlet (72) of the main water storage tank (7) is communicated with a drainage pipeline network (8) through a recharging pipe (14) provided with a variable-frequency pressurizing pump (15);
the support (9) is a steel bar support; the main water storage tank (7) and the secondary water storage tank (11) adopt water storage tanks with the same volume; the single-day maximum drainage amount of the vacuum main machine (5), the volume and the number of the secondary water storage tanks (11) meet the following requirements:
wherein the method comprises the steps ofVIs the volume of the secondary water storage tank (11),Qis the single-day maximum drainage of the vacuum main machine (5),nis the number of secondary water storage tanks (11);
the drainage pipeline network (8) adopts a pipeline phi 15cm, drainage holes (81) with diameters of 0.8-1.5 cm are uniformly distributed on the pipeline every 8-15 cm, and the filter screen is wrapped at the positions of the drainage holes (81).
2. The foundation pit excavation backfill ramming and precipitation recharging water resource comprehensive recycling system according to claim 1, wherein the ground clearance of the main water storage tank (7) is 1000-1500 mm, and the ground clearance of the secondary water storage tank (11) is 600mm smaller than the ground clearance of the main water storage tank (7).
3. The foundation pit excavation backfill ramming and precipitation recharging water resource comprehensive recycling system according to claim 1, wherein the main water storage tank (7) and the secondary water storage tank (11) are respectively stainless steel water tanks capable of being recycled.
4. The construction method for excavation, backfill and tamping of the foundation pit and comprehensive cyclic utilization of precipitation and recharging water resources is characterized by comprising the following steps:
1) Well point arrangement and burying: leveling a site, arranging holes at well points, positioning the holes at the well points, sinking the well point pipes, and connecting the well point pipes with a water collecting main pipe;
the step of connecting the well point pipe and the water collecting main pipe is as follows: flushing the well point pipes (3) one by one before installation, and then connecting the well point pipes (3) with one end of a water collecting main pipe (4); then the other end of the water collecting main pipe (4) is connected with a water inlet of the vacuum host machine (5);
2) Installing system facilities and pumping water in trial mode: paving a system pipeline, installing a water storage tank, connecting system facilities, sealing the pipeline, installing a control circuit and performing water pumping test;
the step of connecting the well point pipe and the water collecting main pipe is as follows: a vacuum host (5), a water supply pipe (6), a conveying pipe (10), a variable-frequency pressurizing pump (15), a recharging pipe (14) and a drainage pipeline network (8) are arranged;
the step of installing the water storage tank is as follows: the main water storage tank (7) and the secondary water storage tank (11) are arranged at positions 400-600 m away from the foundation pit groove (1), and the specifications and the number of the main water storage tank (7) and the secondary water storage tank (11) are determined according to the water inflow of the foundation pit designed at the well point; the bottoms of the main water storage tank (7) and the secondary water storage tank (11) are provided with a support (9), so that the ground clearance of the main water storage tank (7) is 1000-1500 mm, and the ground clearance of the secondary water storage tank (11) is 500mm smaller than the ground clearance of the main water storage tank (7);
the steps of the connection of the system facilities are as follows: the water outlet of the vacuum host (5) is connected with a water inlet (71) at the top of the main water storage tank (7) through a water delivery pipe (6); the second water outlet (73) of the main water storage tank (7) is connected with the bottom of the secondary water storage tank (11) through a conveying pipe (10); the first water outlet (72) of the main water storage tank (7) is communicated with a drainage pipeline network (8) through a recharging pipe (14) provided with a variable-frequency pressurizing pump (15);
3) Groove excavation and pipeline construction: pumping water, excavating a groove, reinforcing a slope toe, constructing a pipeline and performing a water closing experiment;
the water pumping step comprises the following steps: the vacuum degree of the vacuum host (5) is adjusted to be consistent with the precipitation depth, meanwhile, the valve of the water supply pipe (6) is opened, the valve of the recharging pipe (14) is closed, water is supplied to the main water storage tank (7) and the secondary water storage tank (11), and after a certain water storage amount is reached, the water outlet switch (13) can be opened, and engineering construction or facility water and municipal fire-fighting system water are supplied through the circulating water interface (12);
4) Recharging and water sand compacting, tamping and backfilling: the method comprises the steps of trench layered backfilling, recharging, sand compacting by water, effect measurement and compactness detection;
the recharging step comprises the following steps: after the grooves are backfilled and leveled in a layered manner, a valve of a recharging pipe (14) is opened, water is pumped to a drainage pipeline network (8) for recharging, the pumping pressure of a variable-frequency pressurizing pump (15) is regulated to control the recharging water flow rate, and normal work of well point dewatering is always kept in the process.
5. The construction method for comprehensively recycling the foundation pit excavation backfill ramming and precipitation recharging water resources as set forth in claim 4, which is characterized by comprising the following steps:
1) Well point arrangement and burial
a. Leveling site and well point hole distribution positioning: according to the well point design, well point hole distribution positioning is carried out;
b. hole forming at well points: drilling holes at the positions where the holes are distributed at the well points, wherein the depth of the holes is lower than the design depth by 0.5m;
c. sinking well point pipe: immediately inserting a well point pipe (3) to prevent hole collapse after the well point is drilled, and wrapping a double-layer filter screen with a filter Shui Jingguan; the lower end of the well point pipe (3) is manufactured into a flower pipe in a range of 0.8-1.5 and m, pebbles are backfilled outside the pipe, clay is filled up and sealed in a range of 0.8-1.2 and m from the top;
d. connecting the well point pipe and the water collecting main pipe: flushing the well point pipes (3) one by one before installation, and then connecting the well point pipes (3) with one end of a water collecting main pipe (4) by adopting a bent plastic pipe; then the other end of the water collecting main pipe (4) is connected with a water inlet of the vacuum host machine (5);
2) System facility installation and water trial pumping
a. Laying a system pipeline: a vacuum host (5), a water supply pipe (6), a conveying pipe (10), a variable-frequency pressurizing pump (15), a recharging pipe (14) and a drainage pipeline network (8) are arranged;
b. and (3) installing a water storage tank: the main water storage tank (7) and the secondary water storage tank (11) are arranged at positions 400-600 m away from the foundation pit groove (1), and the specifications and the number of the main water storage tank (7) and the secondary water storage tank (11) are determined according to the water inflow of the foundation pit designed at the well point; the bottoms of the main water storage tank (7) and the secondary water storage tank (11) are provided with a support (9), so that the ground clearance of the main water storage tank (7) is 1000-1500 mm, and the ground clearance of the secondary water storage tank (11) is 500mm smaller than the ground clearance of the main water storage tank (7);
c. connection of system facilities: the water outlet of the vacuum host (5) is connected with a water inlet (71) at the top of the main water storage tank (7) through a water delivery pipe (6); the second water outlet (73) of the main water storage tank (7) is connected with the bottom of the secondary water storage tank (11) through a conveying pipe (10); the first water outlet (72) of the main water storage tank (7) is communicated with a drainage pipeline network (8) through a recharging pipe (14) provided with a variable-frequency pressurizing pump (15);
d. and (3) sealing a pipeline: in the process of connecting different pipelines, the joint pore is blocked by glue, and the connecting part is bound by a film;
e. installing a control circuit and performing water pumping test;
3) Trench excavation and pipeline construction
a. Pumping water: the vacuum degree of the vacuum host (5) is adjusted to be consistent with the precipitation depth, meanwhile, the valve of the water supply pipe (6) is opened, the valve of the recharging pipe (14) is closed, water is supplied to the main water storage tank (7) and the secondary water storage tank (11), and after a certain water storage amount is reached, the water outlet switch (13) can be opened, and engineering construction or facility water and municipal fire-fighting system water are supplied through the circulating water interface (12);
b. groove excavation: the water pumping is continuously carried out for 24 hours in the construction process of the foundation pit groove (1), so that the dry construction of the foundation pit groove (1) is ensured; the foundation pit groove (1) is excavated by adopting layered excavation, and 20cm reserved soil layers are reserved at the bottom of the groove;
c. slope toe reinforcement: grouting reinforcement and water sealing treatment are carried out on the position with instability on the pebble layer with strong water permeability at the bottom of the foundation pit groove (1);
d. and (3) pipeline construction: detecting whether the bearing capacity of the bottom surface of the foundation pit groove (1) is qualified or not through a standard penetration test, and performing pipe foundation construction in time after the bearing capacity of the bottom surface of the foundation pit groove (1) is more than 120 Kpa;
e. closing water experiment: when the pipeline is installed and the appearance quality of the pipeline and the inspection well are qualified, immediately performing a water closing test;
4) Backfill and water sand compacting ramming backfill
a. Groove layered backfilling: after the excavation of the foundation pit groove (1) is completed, carrying out groove layered backfilling;
b. recharging: after the grooves are backfilled and leveled in a layered manner, a valve of a recharging pipe (14) is opened, water is pumped to a drainage pipeline network (8) for recharging, the pumping pressure of a variable-frequency pressurizing pump (15) is regulated to control the recharging water flow rate, and normal work of well point dewatering is always kept;
c. compacting sand by water: the water is refilled all the time in the sand shaking process, and the water level of the refill water is kept slightly higher than the backfilled gravel surface so as to ensure full water injection; carrying out point distribution vibration after filling water, wherein the average distance between the point distribution is not more than 50 and cm, and carrying out vibration from two sides of the pipeline to the edge until the pipeline is compact;
d. and (3) measuring the effect: in the process of water sand shaking, the descending depth of the surface of backfill gravel is measured in time, and the effect of water sand shaking and tamping is measured after the water sand shaking and tamping are performed for a certain time;
e. detecting compactness: stopping pouring water after reaching the compaction requirement, then detecting the compactness, carrying out backfilling construction of lower gravel after meeting the specification and the design requirement, and continuing filling and vibrating according to the method until reaching the design elevation.
6. The construction method for comprehensively recycling foundation pit excavation backfill ramming and precipitation recharging water resources according to claim 5, wherein in the leveling site and well point hole distribution positioning step: the well point hole distribution is longitudinally arranged at a position 0.8-1.5 and m outside the excavation line along the groove, and the distance between the well point hole distribution is 2.0-3.0 m.
7. The construction method for comprehensively recycling the foundation pit excavation backfill ramming and precipitation recharging water resources according to claim 6, wherein in the step of connecting the system facilities: the main water storage tank (7) and the secondary water storage tank (11) adopt water storage tanks with the same volume; the single-day maximum drainage amount of the vacuum main machine (5), the volume and the number of the secondary water storage tanks (11) meet the following requirements:
wherein the method comprises the steps ofVIs the volume of the secondary water storage tank (11),Qis a vacuum mainframe (5)Is used for the water discharge capacity of the water pump,nis the number of secondary water storage tanks (11).
8. The construction method for comprehensively and circularly utilizing the foundation pit excavation backfill ramming and precipitation recharging water resources according to any one of claims 4 to 7, wherein the well point pipe and the water collecting main pipe are connected in the steps of: the drain pipeline network (8) adopts a pipeline phi 15cm, drain holes (81) with the diameter of 0.8-1.5 cm are uniformly distributed on the pipeline every 8-15 cm, and the filter screen is wrapped at the drain holes (81).
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| CN110409531A (en) * | 2019-07-13 | 2019-11-05 | 四川玖壹建设工程有限公司 | Pipeline water shakes sand backfill operation platform and its method under town road restricted clearance |
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