CN109736337B - Precipitation device and method for guaranteeing integrity of cushion layer through sediment flowing treatment of foundation elevator shaft sump - Google Patents
Precipitation device and method for guaranteeing integrity of cushion layer through sediment flowing treatment of foundation elevator shaft sump Download PDFInfo
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- CN109736337B CN109736337B CN201910131364.6A CN201910131364A CN109736337B CN 109736337 B CN109736337 B CN 109736337B CN 201910131364 A CN201910131364 A CN 201910131364A CN 109736337 B CN109736337 B CN 109736337B
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Abstract
The invention relates to a precipitation device and a method for ensuring the integrity of a cushion layer by treating quicksand in a sump of an elevator shaft, which are characterized in that a water collecting device is arranged below a concrete cushion layer on the periphery of the sump of the elevator shaft; the water collecting device comprises: the system comprises a strainer pipe, a well point pipe, a connecting pipe and a water collecting main pipe; the main water collecting pipe is arranged around a water collecting pit of the elevator shaft and is arranged below the concrete cushion layer; one end of the water collecting main pipe is connected with the pump, and the other end of the water collecting main pipe is sealed by a plug; after the elevator shaft and the sump are tried to be excavated and the phenomenon of quicksand caused by insufficient precipitation is found, the device and the method are adopted after the simple method cannot treat the quicksand, the technical treatment of the existing basement elevator shaft and sump quicksand can be fundamentally changed, the construction quality hidden danger of the waterproof layer, the cross operation potential safety hazard and the reduction of the construction efficiency are avoided, and the human, machine, material and time investment of the technical treatment during the quicksand of the elevator shaft and the sump can be reduced.
Description
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to a precipitation device and a precipitation method for ensuring the integrity of a cushion layer by treating quicksand in a sump of a basement elevator shaft.
Technical Field
In high-rise building architectural design, foundation plate is equipped with the elevartor shaft, the sump pit is indispensable, when basement excavation elevartor shaft, the sump pit part deepens the position, the condition that the unsmooth sand that appears of elevartor shaft sump pit dewatering often appears, and this kind of condition is that the basement is in the aquifer stratum and the aquifer bottom plate is close elevartor shaft, sump pit bottom, sets up the precipitation well around the foundation ditch can not form effectual precipitation funnel and lead to elevartor shaft, sump pit position.
When the situation is met, the technical treatment measure of civil construction is to build a brick bed course or build a concrete retaining wall to block drift sand, and simultaneously, a submersible pump is arranged at the bottom of the elevator shaft and the sump for pumping and draining underground water, so that the concrete cushion layer and the finished waterproof layer and the waterproof protective layer are prevented from being collapsed by water seepage and arching on the side walls of the elevator shaft and the sump; then, a waterproof steel sleeve is arranged above the shallow well, and a submersible pump is arranged in the waterproof steel sleeve for pumping water; namely, a dewatering well is reserved on a foundation bottom plate for treatment on the basis of building a brick bed mould or drilling a concrete retaining wall.
The technical measures are taken under the condition that the foundation bottom plate reserved dewatering well cannot process the water-bearing layer bottom plate, the reason is that the water-bearing layer bottom plate is close to the bottom of the elevator shaft sump pit or is positioned between the foundation bottom plate and the elevator shaft sump pit bottom plate, and the dewatering well does not form a dewatering funnel. For example, Chinese patent numbers are: 201510323347.4 discloses a construction method of a plugging structure of an anti-floating anchor rod built in a deep well dewatering well in a foundation slab.
At present, the method for treating quicksand in a sump of a basement elevator shaft has the following problems:
1. the elevator shaft and the sump are additionally provided with brick moulding beds or concrete retaining walls.
2. Increased the shallow well of preparation precipitation, specifically do: and (4) manufacturing a shallow well, which comprises an elevator shaft, a pit at the bottom of the sump pit, a lower well pipe and gravel filling filter materials.
3. On the basis of finishing the steps 1 and 2, the quicksand treatment of the elevator shaft and the water collecting pit on the substrate needs to be carried out by adopting a method of reserving a dewatering well on a foundation bottom plate, so that the direct cost consumption of various materials, labor, mechanical working hours and the like is caused; meanwhile, the method of reserving the dewatering well on the foundation slab also causes the cross operation of the construction with the concrete cushion layer, the waterproof protective layer and the foundation slab, seriously influences the construction efficiency and brings potential safety hazards to the construction.
4. When the foundation slab is treated by the method of reserving the dewatering well, the integrity of the waterproof layer cannot be achieved by sealing the waterproof steel sleeve, and the quality of the waterproof layer cannot be ensured.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the dewatering device and the dewatering method which have the advantages of simple equipment, convenience in operation and use, capability of improving the construction efficiency of a foundation concrete cushion layer, a waterproof protective layer and a concrete bottom plate, reduction in construction cost and improvement in waterproof layer quality and ensure the integrity of the cushion layer through the quicksand treatment of the pit of the elevator shaft.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a precipitation device for guaranteeing the integrity of a cushion layer by treating quicksand in a sump of a basement elevator shaft comprises an outer drainage pipe and a pump; the outer drainage pipe is connected with a water outlet of the pump; the pump is arranged outside the foundation slab and in the construction operation surface (in the fertilizer tank); the method is characterized in that: the device also comprises a water collecting device; the water collecting device is arranged below a concrete cushion layer around the elevator shaft sump; wherein:
the water collecting device comprises: the water filter pipes, the well point pipes, the connecting pipes, the water collecting main pipe, the well point pipes and the well point holes are distributed on the relative water-resisting layer around the water collecting pit 4 of the elevator shaft and are arranged in the water-resisting layer;
the main water collecting pipe is arranged around a water collecting pit of the elevator shaft and is arranged below the concrete cushion layer; one end of the water collecting main pipe is connected with the pump, and the other end of the water collecting main pipe is sealed by a plug;
the number of the well point pipes is a plurality of, and the well point pipes are all arranged in well point holes, and the lower part of each well point pipe is provided with a strainer; the main pipe comprises branch pipes with the same diameter as the well point pipes, and each well point pipe is connected with the water collecting main pipe through a connecting pipe.
The well point pipe is arranged in the well point hole, and medium coarse sand is filled at the periphery of the well point pipe.
A precipitation method for guaranteeing the integrity of a cushion layer by treating quicksand in a sump of a basement elevator shaft is characterized in that: adopt elevator shaft sump quicksand to handle the precipitation device who guarantees cushion bed integrality, the concrete method is:
(1) arranging well point lines about 0.5m along the outer sides of the upper opening boundary lines of the elevator shaft and the sump to be excavated, firstly adopting water flushing or water drilling to punch holes, probing the bottom depth of a water-containing sand layer, determining the lengths of well point pipes and water filter pipes, determining the distance between well points, determining the number of the well points, and determining whether coarse sand filter materials need to be filled according to the condition of the water-containing sand layer; processing and manufacturing a well point pipe and a strainer pipe, connecting the well point pipe and the strainer pipe, and preparing materials;
(2) the construction process of a single point well comprises the following steps: adopting water flushing or water drilling to form a hole, controlling the hole diameter to be about phi 100mm, enabling the well depth to exceed the bottom of a sand layer and enter a water-resisting layer, putting a well point pipe after the hole is formed, and filling coarse sand filter materials;
(3) installing a pump, laying and connecting a water collecting main pipe and an extension pipe thereof, and connecting a well point pipe, a connecting pipe and a water collecting main pipe;
(4) starting a pump to pump water, observing the precipitation condition, and when the air pumping phenomenon occurs in most of well point pipes, indicating that the precipitation is basically in place, and performing the operation of excavating an elevator shaft and a water collecting pit;
(5) digging small grooves along the main water collecting pipe and the extension pipe thereof, putting the main water collecting pipe into the small grooves, and driving the main water collecting pipe and the connecting pipe into the lower surface of the concrete cushion; after the drift sand treatment of the elevator shaft sump is finished, the integrity of the base concrete cushion layer is ensured;
(6) after the construction of the foundation concrete cushion layer is finished, the subsequent construction of the waterproof layer, the waterproof protective layer and the foundation concrete bottom plate can be the same as the construction without the flowing sand of the elevator shaft and the water collecting pit.
(7) The dewatering process needs to be carried out continuously, and according to the construction progress, after the construction of the concrete bottom plate is completed, the dewatering can be stopped, and the pump is withdrawn.
Compared with the prior art, the invention has the following substantial characteristics and remarkable effects:
fundamentally has changed current basement elevartor shaft, pit drift sand technical treatment needs to build by laying bricks and fetal membranes or concrete barricade and need do the shallow well, reserve the hole on bed course, the waterproof layer, waterproof protective layer and soleplate, bury waterproof steel casing underground on the shallow well, the way of installing the immersible pump in waterproof steel casing and drawing water, make civil engineering construction become under the circumstances that the elevartor shaft appears, pit drift sand and not appear and construct with appearing the drift sand, waterproof layer construction quality hidden danger has been avoided, cross operation potential safety hazard has been avoided, the efficiency of construction that cross operation arouses reduces, the people of technical treatment, machine, material, in time input when the pit appears the drift sand have been reduced to the elevartor shaft, the pit.
Drawings
FIG. 1 is a schematic view of the apparatus and method of the present invention.
Fig. 2 is a schematic view of a water collecting device in the apparatus of the present invention.
In the figure: the water-collecting system comprises an outer drainage pipe 1, a pump 2, a concrete cushion layer 3, an elevator shaft sump 4, a water filter pipe 5, a well point pipe 6, a well point hole (filled with coarse sand) 7, an aquifer 8, a connecting pipe 9, a relative water-resisting layer 10, a water collecting main pipe and an extension pipe 11 thereof, an underground water level 12 and a foundation pit side slope 13. Wherein: the water collecting device comprises: comprises a water collecting main pipe, an extension pipe, a connecting pipe, a well point pipe and a strainer pipe.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings
As shown in fig. 1, the precipitation device for guaranteeing the integrity of a cushion layer by treating quicksand in a sump of a base elevator shaft comprises an outer drainage pipe 1, a pump 2 (a vacuum pump, a self-priming pump and a centrifugal pump) and a water collection device; the outer drainage pipe 1 is connected with a water outlet of the pump 2; the pump is arranged outside the foundation bottom plate and in the foundation construction operation surface (in the fertilizer groove) 13; the drain pipe is an outer drain pipe of the pump, and generally a hose such as a plastic pipe is used for draining water pumped by the pump out of the foundation pit or a designated water tank (the foundation pit is deep, the self-drainage capacity of the pump cannot directly drain water out of the foundation pit, and secondary drainage is needed). The water collecting device is arranged below a concrete cushion layer 3 around a sump 4 of the elevator shaft; wherein:
the water collecting device comprises: the water filter pipe 5, the well point pipe 6, the connecting pipe 9 and the water collecting main pipe 11; well point pipes 6 and well point holes 7 which are distributed on a relative water-resisting layer 10 around the elevator shaft sump 4 and are arranged in the aquifer 8; the main water collecting pipe and the extension pipe 11 thereof are arranged around the water collecting pit 4 of the elevator shaft and are arranged below the concrete cushion layer 3; the collecting main pipe is arranged in a small groove excavated around the elevator shaft and the base around the collecting pit, the collecting main pipe is generally made of a steel pipe (or a PVC pipe) with the diameter of phi 40, the main pipe comprises branch pipes with the same diameter as the well point pipe, the branch pipes are tightly connected with the well point pipe through connecting pipes, the distance between the branch pipes is determined according to the actual situation on site, the collecting main pipes are tightly connected with each other through rubber pipes (or steel wire pipes), the extending long pipes of the collecting main pipe from the elevator shaft and the collecting pit to the pump can be replaced by plastic pipes with the same diameter, one end of the collecting main pipe is connected with the pump, and the other end of the collecting main. And (4) finishing the quicksand treatment, and pressing the quicksand into the lower surface of the concrete cushion layer when the concrete cushion layer is punched.
The connecting pipe is a plastic pipe with the inner diameter equivalent to the outer diameter of the well point pipe and the branch pipe of the water collecting main pipe, and is tightly spliced with the well point pipe and the branch pipe.
A plurality of well point pipes 6 are arranged in well point holes 7 (filled with coarse sand), and the well point pipes and the well point holes 7 are distributed in an aquifer 8 above a relative water-resisting layer 10 on the periphery of the elevator shaft sump 4;
the lower part of each well point pipe 6 is a strainer; the water collecting main pipe comprises branch pipes with the same diameter as the well point pipes, and each well point pipe 6 is connected with the water collecting main pipe 11 through a connecting pipe 9. The well point pipe is a steel pipe (PVC pipe) with the length of 4 minutes, the upper part of the well point pipe is tightly inserted with the connecting pipe, and the lower part of the well point pipe is tightly inserted with the strainer pipe.
The strainer is a plastic pipe with the inner diameter equivalent to the outer diameter of the well point pipe, a water through hole is processed on the pipe wall, and a nylon net is wrapped outside the strainer.
The utility model provides a well shaft sump quicksand handles precipitation method of guaranteeing bed course integrality, adopts well shaft sump quicksand to handle the precipitation device of guaranteeing bed course integrality, finds that precipitation is not in place at the trial excavation well shaft, sump and appears the quicksand phenomenon, and after simple method can not handle, adopts well shaft sump quicksand to handle the precipitation method of guaranteeing bed course integrality. The specific method comprises the following steps:
(1) arranging well point lines about 0.5m along the outer sides of the upper opening boundary lines of the elevator shaft and the sump to be excavated, firstly adopting water flushing or water drilling to punch holes, probing the bottom depth of a water-containing sand layer, determining the lengths of well point pipes and water filter pipes, determining the distance between well points, determining the number of the well points, and determining whether coarse sand filter materials need to be filled according to the condition of the water-containing sand layer; processing and manufacturing a well point pipe and a strainer pipe, connecting the well point pipe and the strainer pipe, and preparing materials;
(2) the construction process of a single point well comprises the following steps: adopting water flushing or water drilling to form a hole, controlling the hole diameter to be about phi 100mm, controlling the well depth to exceed the bottom of a sand layer, putting into a well point pipe after the hole is formed, and filling coarse sand filter materials;
(3) installing a pump, laying and connecting a water collecting main pipe and an extension pipe thereof, and connecting a well point pipe and the water collecting main pipe by using a connecting pipe;
(4) starting a pump to pump water, observing the precipitation condition, and when the air pumping phenomenon occurs in most of well point pipes, indicating that the precipitation is basically in place, and performing the operation of excavating an elevator shaft and a water collecting pit;
(5) digging small grooves along the main water collecting pipe and the extension pipe thereof, putting the main water collecting pipe into the small grooves, and driving the main water collecting pipe into the lower surface of the concrete cushion; after the drift sand treatment of the elevator shaft sump is finished, the integrity of the base concrete cushion layer is ensured;
(6) after the construction of the foundation concrete cushion layer is finished, the subsequent construction of the waterproof layer, the waterproof protective layer and the foundation concrete bottom plate can be the same as the construction without the flowing sand of the elevator shaft and the water collecting pit.
(7) And the dewatering process needs to be continuously carried out, and according to the construction progress, after the construction of the foundation concrete bottom plate is completed, the dewatering can be stopped, and the pump is withdrawn.
Claims (1)
1. A precipitation method for guaranteeing the integrity of a cushion layer by treating quicksand in a foundation elevator shaft sump is characterized in that a precipitation device for guaranteeing the integrity of the cushion layer by treating the quicksand in the foundation elevator shaft sump is adopted, and the precipitation device comprises an outer drainage pipe (1) and a pump (2); the pump is a vacuum pump, and the outer drainage pipe is connected with a drainage port of the vacuum pump; the vacuum pump is arranged outside the foundation slab and in the construction operation surface; the method is characterized in that: the device also comprises a water collecting device; the water collecting device is arranged below a concrete cushion layer (3) around the elevator shaft sump (4); wherein:
the water collecting device comprises: the water filtering pipes (5), the well point pipes (6), the connecting pipes (9) and the water collecting main pipe (11), wherein the well point pipes (6) and the well point holes (7) are distributed above a relative water-resisting layer (10) on the periphery of the elevator shaft water collecting pit (4) and are arranged in a water-bearing layer (8);
the main water collecting pipe is arranged around a water collecting pit of the elevator shaft and is arranged below the concrete cushion layer; one end of the water collecting main pipe is connected with the vacuum pump, and the other end of the water collecting main pipe is sealed by a plug;
a plurality of well point pipes (6) are arranged in the well point holes (7), and the lower part of each well point pipe is provided with a strainer; the main pipe comprises branch pipes with the same diameter as the well point pipes, and each well point pipe is connected with the water collecting main pipe (11) through a connecting pipe (9);
the water lowering method for ensuring the integrity of the cushion layer by treating quicksand in the sump of the basement elevator shaft comprises the following specific steps:
(1) arranging well point lines about 0.5m along the outer sides of the upper opening boundary lines of the elevator shaft and the sump to be excavated, firstly adopting water flushing or water drilling to punch holes, probing the bottom depth of a water-containing sand layer, determining the lengths of well point pipes and water filter pipes, determining the distance between well points, determining the number of the well points, and determining whether coarse sand filter materials need to be filled according to the condition of the water-containing sand layer; processing, manufacturing and connecting a well point pipe and a strainer, and preparing materials;
(2) the construction process of a single point well comprises the following steps: adopting water flushing or water drilling to form a hole, controlling the hole diameter to be about phi 100mm, controlling the well depth to exceed the bottom of a sand layer, putting into a well point pipe after the hole is formed, and filling coarse sand filter materials;
(3) installing a vacuum pump, laying and connecting a water collecting main pipe, and connecting a well point pipe and the water collecting main pipe by using a connecting pipe;
(4) starting a vacuum pump to pump water, knowing the underground water level by observing the water outlet condition of well point pipes in the water pumping process, and excavating an elevator shaft and a water collecting pit when a large amount of air is pumped out from most of the well point pipes to indicate that the water has fallen in place;
(5) digging a small groove along the main water collecting pipe, putting the main water collecting pipe into the small groove, and driving the main water collecting pipe and the connecting pipe into the lower surface of the concrete cushion layer; after the drift sand treatment of the elevator shaft sump is finished, the integrity of the base concrete cushion layer is ensured;
(6) and the precipitation process needs to be carried out continuously, and according to the construction progress, after the construction of the concrete bottom plate is completed, the precipitation can be stopped, and the vacuum pump is withdrawn.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910131364.6A CN109736337B (en) | 2019-02-22 | 2019-02-22 | Precipitation device and method for guaranteeing integrity of cushion layer through sediment flowing treatment of foundation elevator shaft sump |
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| CN201910131364.6A CN109736337B (en) | 2019-02-22 | 2019-02-22 | Precipitation device and method for guaranteeing integrity of cushion layer through sediment flowing treatment of foundation elevator shaft sump |
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| CN109736337B true CN109736337B (en) | 2021-03-05 |
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| CN112709247B (en) * | 2021-01-20 | 2022-05-31 | 北京城建道桥建设集团有限公司 | Subway construction dewatering system and method for complex ground |
| CN114809010B (en) * | 2022-05-06 | 2023-08-18 | 山西三建集团有限公司 | Construction method of elevator shaft and pit foundation retaining wall in easy-collapse soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203924083U (en) * | 2014-06-27 | 2014-11-05 | 中国水利水电第十三工程局有限公司 | Cushion cap excavation of foundation pit well-points dewatering device |
| CN104314090A (en) * | 2014-08-29 | 2015-01-28 | 中铁八局集团建筑工程有限公司 | Deep foundation pit bedrock drainage culvert and drainage system and drainage construction method thereof |
| CN206495224U (en) * | 2017-02-27 | 2017-09-15 | 青岛土木建工集团有限公司 | A kind of foundation pit of elevator shaft dewatering process structure |
| CN106930304A (en) * | 2017-03-24 | 2017-07-07 | 中冶建工集团有限公司 | Drift sand base pit dewatering construction method |
| CN107354950A (en) * | 2017-07-13 | 2017-11-17 | 中国建筑第七工程局有限公司 | A kind of economic quickly catch pit local dewatering method |
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