阅读说明：本技术 一种地下深基坑降排水永临一体化施工方法 (Drainage and landing permanent-temporary integrated construction method for underground deep foundation pit ) 是由 周杰 高玉亭 李少雄 张慧杰 邱晓勇 潘志忠 杨亚涛 罗昭晟 郭溜达 丁榆 樊斌 于 2020-06-24 设计创作，主要内容包括：本发明涉及地下深基坑降排水的技术领域,公开了一种地下深基坑降排水永临一体化施工方法,包括以下施工步骤：挖设基坑,将基坑的坑底夯实,在基坑的底部铺设碎石,将碎石排列成一排或一列,在碎石中间围合形成滤水通道,随后在碎石上进行垫层回填；在地下室的外墙的外侧与基坑之间修筑止水帷幕,利用止水帷幕对地下室的外围的水位进行隔绝；在地下室的外墙与止水帷幕之间设置多个降水井；在降水井内设置有抽水泵,在基坑的外侧设置有蓄水池,抽水泵的导水管的出水端与蓄水池连通,达到降低地下室结构的浮力的效果,降低渗漏风险,同时抽水泵还可以抽取地下室的外侧的水进行冲洗地面、绿化灌溉,节约水资源,符合绿色施工及绿色建筑理念。(The invention relates to the technical field of underground deep foundation pit drainage and water lowering, and discloses a permanent and temporary integrated construction method for underground deep foundation pit drainage and water lowering, which comprises the following construction steps: digging a foundation pit, tamping the bottom of the foundation pit, paving broken stones at the bottom of the foundation pit, arranging the broken stones into a row or a column, enclosing the broken stones to form a water filtering channel, and then backfilling a cushion layer on the broken stones; building a waterproof curtain between the outer side of the outer wall of the basement and the foundation pit, and isolating the water level at the periphery of the basement by using the waterproof curtain; arranging a plurality of dewatering wells between the outer wall of the basement and the waterproof curtain; be provided with the suction pump in the precipitation well, be provided with the cistern in the outside of foundation ditch, the play water end and the cistern intercommunication of the aqueduct of suction pump reach the effect that reduces the buoyancy of basement structure, reduce the seepage risk, the water that the suction pump can also extract the outside of basement simultaneously washes ground, afforestation and irrigates, and the water economy resource accords with green construction and green building theory.)

1. A water drainage and temporary integrated construction method for an underground deep foundation pit is characterized by comprising the following construction steps:

s1, building a waterproof curtain on the outer side of the outer wall of the basement, and then digging a foundation pit along the outer side of the waterproof curtain; tamping the bottom of the foundation pit, paving broken stones at the bottom of the foundation pit, arranging the broken stones into a row or a column, enclosing the broken stones to form a water filtering channel, and then constructing a cushion layer on the broken stones;

s2, constructing a basement structure above the cushion layer, and isolating the water level at the periphery of the basement by using the waterproof curtain in the construction process of the basement structure;

s3, after the construction of the basement structure is completed, backfilling a soil layer of the foundation pit, and arranging a plurality of dewatering wells between the outer wall of the basement and the waterproof curtain in the backfilling process of the soil layer;

s4, arranging a water suction pump in the precipitation well, wherein the water suction pump is used for pumping out water in the precipitation well;

and S5, connecting a water guide pipe on the water suction pump, arranging a reservoir outside the foundation pit, communicating the water outlet end of the water guide pipe with the reservoir, and arranging a spraying device on the reservoir.

2. The underground deep foundation pit drainage and temporary integrated construction method according to claim 1, wherein in step S1, drainage ditches are built below the drainage channels, and are arranged around the periphery of the basement structure; the escape canal is the level and arranges, the escape canal respectively with a plurality of precipitation well intercommunication.

3. The method of claim 1, wherein in step S3, when a pit is dug downwards along the bottom of the foundation pit, a well pipe is installed into the pit, the lower end of the well pipe is embedded in the pit, and the upper end of the well pipe extends to the top of the foundation pit; and then pouring concrete slurry on the periphery of the well pipe, so that the lower end part of the well pipe is fixedly arranged in the deep pit, the well pipe is arranged in a vertical state, and then backfilling a foundation pit soil layer.

4. The method of claim 1, wherein during backfilling of soil layers in step S3, a plurality of support beams are installed around the dewatering well, and each support beam is constructed, and soil layers are backfilled on the support beams, wherein the support beams and the soil layers are alternately arranged until backfilling of the soil layers is completed; one end of the supporting beam is fixedly arranged with a supporting pile of the foundation pit, and the other end of the supporting beam surrounds the circumference of the outer side wall of the dewatering well and is fixedly arranged with the outer wall of the basement; and a plurality of supporting beams are arranged at the periphery of the dewatering well along the height direction of the dewatering well and are arranged at intervals.

5. The method as claimed in any one of claims 2 to 4, wherein the method comprises chiseling the laitance of the top of the support pile, constructing a concrete crown beam on the top of the support pile, and fixedly connecting the support beam on the top of the dewatering well to the concrete crown beam.

6. The underground deep foundation pit drainage permanent temporary integrated construction method according to any one of claims 2 to 4, wherein broken stones are filled in the drainage ditch.

7. The underground deep foundation pit drainage and temporary integrated construction method according to any one of claims 2 to 4, wherein the dewatering well is dug downwards to a depth greater than that of the drainage ditch.

8. The underground deep foundation pit drainage permanent temporary integrated construction method according to any one of claims 2 to 4, wherein the depth of the water filtering channel is consistent with that of the drainage ditch, and the water filtering channel is communicated with the drainage ditch.

9. The method for integral construction of underground deep foundation pit, drainage pipe and temporary reservoir of any one of claims 2 to 4, wherein in step S1, a drainage pipe is arranged in the pad layer, the gravel is wrapped on the periphery of the drainage pipe, the water filtering channel is arranged in the drainage pipe, and two ends of the drainage pipe are respectively communicated with the drainage ditch.

10. The underground deep foundation pit drainage and permanent temporary integrated construction method as claimed in claim 9, wherein in step S1, the side wall of the drainage tube is provided with a plurality of through holes, the plurality of through holes are arranged on the left and right sides of the drainage tube, the periphery of the drainage tube is covered with crushed stones, and the periphery of the crushed stones is wrapped with a filter screen.

Technical Field

The invention relates to the technical field of underground deep foundation pit drainage and drainage, in particular to a permanent and temporary integrated construction method for underground deep foundation pit drainage and drainage.

Background

In order to prevent the leakage of groundwater, the function of a waterproof curtain is generally utilized to be temporarily isolated from the peripheral water level, the waterproof curtain is a closed and crossed curtain formed by mutually meshing cement soil mixing piles, and the waterproof curtain mainly has the function of blocking groundwater except the waterproof curtain.

In the engineering construction designed with the waterproof curtain, due to the effect of the waterproof curtain, the foundation pit is subjected to precipitation, and then a basement structure is constructed; according to the principle, after foundation pit earthwork backfilling and the construction of the basement structure are completed, the water level between the waterproof curtain and the basement outer wall gradually rises through rainfall or foundation pit rainfall and other ways.

In this in-process, under the general condition, basement post-cast strip does not seal, and the water level of groundwater all around rises the back, must bring harm and influence to basement and the post-cast strip structure of later stage construction quality of hiding.

Disclosure of Invention

The invention aims to provide a continuous and integrated construction method for drainage and precipitation of an underground deep foundation pit, and aims to solve the problem that underground water causes harm and influence on the construction quality of a basement and a later-stage post-cast strip structure in the prior art.

The invention is realized in this way, a construction method for permanently and integrally constructing underground deep foundation pits by water drainage and drainage, which comprises the following construction steps:

s1, building a waterproof curtain on the outer side of the outer wall of the basement, and then digging a foundation pit along the outer side of the waterproof curtain; tamping the bottom of the foundation pit, paving broken stones at the bottom of the foundation pit, arranging the broken stones into a row or a column, enclosing the broken stones to form a water filtering channel, and then constructing a cushion layer on the broken stones;

s2, constructing a basement structure above the cushion layer, and isolating the water level at the periphery of the basement by using the waterproof curtain in the construction process of the basement structure;

s3, after the construction of the basement structure is completed, backfilling a soil layer of the foundation pit, and arranging a plurality of dewatering wells between the outer wall of the basement and the waterproof curtain in the backfilling process of the soil layer;

s4, arranging a water suction pump in the precipitation well, wherein the water suction pump is used for pumping out water in the precipitation well;

and S5, connecting a water guide pipe on the water suction pump, arranging a reservoir outside the foundation pit, communicating the water outlet end of the water guide pipe with the reservoir, and arranging a spraying device on the reservoir.

Further, in step S1, a drainage ditch is built below the drainage channel, the drainage ditch being arranged around the periphery of the basement structure; the escape canal is the level and arranges, the escape canal respectively with a plurality of precipitation well intercommunication.

Further, in step S3, when a pit is dug down along the bottom of the foundation pit, a well pipe is installed into the pit, a lower end of the well pipe is embedded in the pit, and an upper end of the well pipe extends to the top of the foundation pit; and then pouring concrete slurry on the periphery of the well pipe, so that the lower end part of the well pipe is fixedly arranged in the deep pit, the well pipe is arranged in a vertical state, and then backfilling a foundation pit soil layer.

Further, in the soil layer backfilling process of step S3, a plurality of support beams are arranged on the periphery of the dewatering well, and each support beam is constructed, and soil layers are backfilled on the support beams, wherein the support beams and the soil layers are alternately arranged until the soil layer backfilling is completed; one end of the supporting beam is fixedly arranged with a supporting pile of the foundation pit, and the other end of the supporting beam surrounds the circumference of the outer side wall of the dewatering well and is fixedly arranged with the outer wall of the basement; and a plurality of supporting beams are arranged at the periphery of the dewatering well along the height direction of the dewatering well and are arranged at intervals.

And further chiseling floating slurry on the pile top of the support pile, building a concrete crown beam on the pile top of the support pile, and fixedly connecting the support beam positioned on the top of the dewatering well with the concrete crown beam.

Furthermore, the inside of the drainage ditch is filled with crushed stones.

Further, the depth of the dewatering well dug downwards is larger than that of the drainage ditch.

Furthermore, the depth of the water filtering channel is consistent with that of the drainage ditch, and the water filtering channel is communicated with the drainage ditch.

Further, in step S1, a drainage tube is disposed in the cushion layer, the gravel is wrapped around the drainage tube, the water filtering channel is disposed inside the drainage tube, and two ends of the drainage tube are respectively communicated with the drainage ditch.

Further, in step S1, a plurality of through holes are formed in the side wall of the drainage tube, the through holes are arranged on the left side and the right side of the drainage tube, crushed stones cover the periphery of the drainage tube, and a filter screen wraps the periphery of the crushed stones.

Compared with the prior art, the invention provides a permanent temporary integrated construction method for drainage of underground deep foundation pits, wherein in the process of building a basement structure, a waterproof curtain is built between the outer side of the outer wall of the basement and the foundation pit, then a plurality of precipitation wells are arranged between the outer wall of the basement and the waterproof curtain, and water suction pumps are also arranged in the precipitation wells.

Drawings

FIG. 1 is a schematic flow chart of steps of a drainage and temporary integral construction method for an underground deep foundation pit;

FIG. 2 is a schematic sectional view of an underground deep foundation pit drainage water-lowering and temporary integrated construction method provided by the invention;

FIG. 3 is a schematic top view cross-sectional view of a construction method for permanently and integrally constructing a water drainage and temporary reservoir in an underground deep foundation pit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1 to 3, the preferred embodiment of the present invention is shown.

A water drainage and temporary integrated construction method for an underground deep foundation pit comprises the following construction steps:

s1, building a waterproof curtain on the outer side of the outer wall of the basement, and then digging a foundation pit along the outer side of the waterproof curtain; tamping the bottom of the foundation pit, paving broken stones 60 at the bottom of the foundation pit, arranging the broken stones 60 into a row or a column, enclosing the broken stones 60 to form a water filtering channel, and then constructing a cushion layer 80 on the broken stones 60;

s2, constructing the basement structure 20 above the cushion layer 80, and isolating the water level at the periphery of the basement by using the waterproof curtain 100 in the construction process of the basement structure 20;

s3, after the construction of the basement structure 20 is completed, backfilling a soil layer of the foundation pit, and arranging a plurality of dewatering wells 30 between the outer wall of the basement and the waterproof curtain 100 in the backfilling process of the soil layer;

s4, arranging a water pump 31 in the precipitation well 30, wherein the water pump 31 is used for pumping water in the precipitation well 30;

s5, the water guide pipe 38 is connected to the water suction pump 31, a water storage tank 40 is arranged on the outer side of the foundation pit, the water outlet end of the water guide pipe 38 is communicated with the water storage tank 40, a spraying device is arranged on the water storage tank 40, and water pumped by the water suction pump 31 can be used for tree watering, road surface cleaning and other operations through the spraying device.

According to the construction method for permanently integrating drainage and landing of the underground deep foundation pit, in the process of building the basement structure 20, the waterproof curtain 100 is built between the outer side of the outer wall of the basement and the foundation pit, then the plurality of dewatering wells 30 are arranged between the outer wall of the basement and the waterproof curtain 100, and the water suction pumps 31 are further arranged in the dewatering wells 30, so that the dewatering wells 30 can be arranged to play a role in reducing the water level between the waterproof curtain 100 and the outer wall of the basement, the effect of reducing the buoyancy of the basement structure 20 is achieved, the seepage risk and the concealment of a later-stage structure post-cast strip are reduced, meanwhile, the water suction pumps 31 can also extract water on the outer side of the basement to flush the ground, green irrigation is achieved, water resources are saved, and the concept of green construction and green buildings is met.

Compared with the traditional water stop treatment method of the basement structure 20, firstly, the invention does not need to construct excessive water stop structures around the basement specially, in addition, when the rain is rained or the outside of the foundation pit leaks, the precipitation well 30 can collect the water quantity, when the water quantity in the precipitation well 30 is small, the water in the precipitation well 30 does not need to be pumped out, and when the water level condition around the basement structure 20 can be judged according to the water quantity and the water level height in the precipitation well 30, the advance prevention of seepage prevention and leakage prevention is facilitated.

A water level warning line is arranged in the dewatering well 30, an alarm and a controller are arranged at the water level warning line, the alarm is connected with a computer end or a mobile terminal in a wired or wireless mode, when the water level reaches the level of the water level warning line, the alarm is triggered to be started, the alarm sends a water level exceeding signal to the computer end or the mobile terminal and the controller, meanwhile, the controller starts the water suction pump 31, and the water suction pump 31 starts pumping until the water in the dewatering well 30 is pumped to be below the water level warning line.

Similarly, the user can also check the water level condition in the dewatering well 30 in real time through the computer or the mobile terminal, the real-time water level height in the dewatering well 30 does not reach the level of the water level warning line, the user can also send a water pumping instruction to the controller through the computer or the mobile terminal, the water pumping operation is continuously performed on the dewatering well 30, and the water level in the dewatering well 30 is maintained at a lower level.

The side wall of the dewatering well 30 is also provided with a fiber grating sensor, wherein the strain sensor is a strain sensor, the strain sensor is arranged on the inner side wall of the dewatering well 30, the strain sensor has small volume, light weight, plastic geometric shape and small transmission loss, can realize remote control monitoring at a long distance, detects the temperature, pressure, strain, stress, flow speed, liquid level, liquid concentration, components and the like in the dewatering well 30, detects the compression and strain conditions of the inner side wall of the dewatering well 30 and the temperature, pressure, liquid level, components and the like of the water in the dewatering well 30, and is connected with a computer end or a mobile terminal in a wired and wireless mode, so that the dewatering well 30 and the water level state can be checked through the computer end or the mobile terminal in real time.

Specifically, in step S1, a drainage ditch 70 is built below the water filtration channel, the drainage ditch 70 is arranged around the periphery of the basement structure 20, and similarly, the drainage ditch 70 is also arranged around the periphery of the water filtration channel; the drainage ditch 70 is horizontally arranged, and the drainage ditch 70 is respectively communicated with the plurality of precipitation wells 30, so that water flow around the basement structure 20 can flow into the corresponding precipitation wells 30 through the drainage ditch 70, and the precipitation of the foundation pit is realized.

In step S3, when a pit is dug downward along the bottom of the foundation pit, a well pipe is installed in the pit, the lower end of the well pipe is embedded in the pit, and the upper end of the well pipe extends to the top of the foundation pit; and then pouring concrete slurry on the periphery of the well pipe, so that the lower end part of the well pipe is fixedly arranged in the deep pit, the well pipe is arranged in a vertical state, and then backfilling a foundation pit soil layer.

In order to ensure the stability of the well pipe in the soil layer backfilling process, when the pit is dug, the inner diameter of the pit is larger than that of the well pipe, so that when the well pipe is inserted into the pit, a gap is formed between the outer side wall of the well pipe and the inner side wall of the pit, then concrete slurry is poured into the gap, and after the concrete slurry is solidified, the soil layer backfilling can be carried out.

In the process of soil layer backfilling, the well pipe is ensured to be in a vertical state.

The well pipe may be a plastic pipe or a cement pipe, but is not limited to the above-mentioned materials.

In the process of backfilling the soil layer, the lower end of the well pipe is embedded in the deep pit, and the well pipe is fixed through the concrete slurry, so that the well pipe does not need to be supported or interfered in the backfilling process, normal backfilling construction is not influenced, and the operation is simple.

Therefore, the dewatering well 30 does not need to be dug again in the foundation, and the effects of saving the construction time and the construction cost can be achieved.

On the side of the well which faces the drain 70, there is an opening which facilitates the flow of water in the drain 70 into the interior of the well, and around the opening there are crushed stones 60 which, during the flow of water, can act as a filter for the water flowing out of the drain 70, such crushed stones 60 being present.

The opening is covered with a filtering membrane, so that the filtering effect is further achieved.

In order to ensure the stability of the plurality of precipitation wells 30, a fixed anchor cable is fixedly connected between two adjacent precipitation wells 30 and is respectively arranged around the periphery of the well pipe in a surrounding manner, so that the precipitation wells 30 can be fixed, the precipitation wells 30 are not prone to tilting in the soil backfill process, and after construction is completed, the fixed anchor cable also enables the plurality of precipitation wells 30 surrounding the outer side of the basement structure to have better integrity, and the stability and the anti-interference performance of the precipitation wells 30 are improved.

The communication pipe 36 is arranged at the bottom of the adjacent precipitation wells 30, one end of the communication pipe 36 is communicated with one precipitation well 30, the other end of the communication pipe 36 is communicated with the other adjacent precipitation well 30, that is, all the precipitation wells 30 are communicated, the liquid level among the precipitation wells 30 is always kept consistent similar to the principle of the communication pipe, even if the water levels at different positions of the basement structure 20 are different, the water flows from the precipitation well 30 with the higher water level to the precipitation well 30 with the lower water level through the communication pipe 36, and finally, the water levels of all the precipitation wells 30 are kept consistent.

The advantages of this are the following:

first, the relationship similar to the communicating vessels among the precipitation wells 30 can ensure that the water levels of all the precipitation wells 30 are consistent, and the condition that the water level is too high or too low cannot occur, so that the problem that the local leakage occurs in the basement structure 20 due to the high local water level can be avoided.

Secondly, as the plurality of dewatering wells 30 are communicated, a water pump 31 does not need to be arranged in each dewatering well 30, and only the water pump 31 needs to be arranged in one or two dewatering wells 30, namely, a dewatering well 30 special for draining water is arranged, so that when the water pump 31 pumps water in the dewatering well 30 provided with the water pump 31, the water level of the dewatering well 30 is lowered, and at the moment, the water level of the dewatering well 30 adjacent to the dewatering well 30 is higher, so that the water flows into the dewatering well 30 provided with the water pump 31, and the effect of draining the dewatering well 30 is achieved; the problem of simultaneously and synchronously pumping water for all dewatering wells 30 can be solved while the installation number and the construction difficulty of the water pumps 31 are reduced.

In the soil layer backfilling process of the step S3, a plurality of supporting beams are arranged on the periphery of the dewatering well 30, each supporting beam is built, a soil layer is backfilled on each supporting beam, then the supporting beams are built on the soil layer, and the supporting beams and the soil layer are alternately arranged until the soil layer backfilling is completed; one end of the supporting beam is fixedly arranged with a supporting pile of the foundation pit, and the other end of the supporting beam surrounds the circumference of the outer side wall of the dewatering well 30 and is fixedly arranged with the outer wall of the basement; a plurality of support beams are provided at the outer circumference of the precipitation well 30 along the height direction of the precipitation well 30, and the plurality of support beams are arranged at intervals.

The supporting beam is arranged, so that the relation between the dewatering well 30 and the soil layer, the outer wall of the basement and the supporting piles is further enhanced, the supporting beam is in a more stable and stable state, and the supporting beam has better integrity and consistency with the outer wall of the soil layer and the basement and the supporting piles, and is more stable.

Chiseling floating slurry on the pile top of the support pile, building a concrete crown beam on the pile top of the support pile, and fixedly connecting a support beam positioned on the top of the dewatering well 30 with the concrete crown beam.

The inside in escape canal 70 is filled with rubble 60, further plays the effect of filtration screening to the water in the escape canal 70, avoids granular debris such as soil, small stone, gravel etc. to flow into precipitation well 30 through escape canal 70.

The dewatering well 30 is dug downward to a depth greater than that of the drainage ditch 70 so that water can easily flow into the dewatering well 30 by gravity.

The depth of the water filtering channel is consistent with that of the drainage ditch 70, and the water filtering channel is communicated with the drainage ditch 70, so that the water flow at the bottom of the basement structure 20 firstly enters the drainage ditch 70 after being filtered by the water filtering channel, and then flows into the precipitation well 30 through the drainage ditch 70 and under the filtering of the crushed stones 60, and the collection of the water at the bottom of the building structure is realized.

In step S1, the drainage tube 62 is disposed in the pad layer 80, the gravel 60 is wrapped around the drainage tube 62, the drainage channel is disposed inside the drainage tube 62, two ends of the drainage tube 62 are respectively connected to the drainage ditch 70, and the drainage tube 62 is disposed to prevent the drainage channel from being squeezed by the basement structure 20 to deform or change the flow path, which results in the problem that water cannot flow out.

In step S1, the sidewall of the drainage tube 62 has a plurality of through holes, the plurality of through holes are disposed on the left and right sides of the drainage tube 62, the outer periphery of the drainage tube 62 is covered with the crushed stones 60, the outer periphery of the crushed stones 60 is wrapped with the filter screen, and water passes through the filter screen, the outer side of the drainage tube 62 and the inner side of the drainage tube 62 during the flowing process for three times, and finally reaches the drainage ditch 70 through the water filtering channel.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.