CN214940304U - Pit-in-pit double-ring steel sheath dewatering structure - Google Patents

Abstract

A pit-in-pit double-ring steel sheath dewatering structure relates to the field of building construction and comprises a foundation mat, a sand-free pipe pre-embedded below the foundation mat, gravels filled around the sand-free pipe, a sump dug above the foundation mat, a double-ring steel sheath arranged between the sand-free pipe and the sump, a plugging plate arranged on the double-ring steel sheath, a submersible pump arranged in the sand-free pipe and a drain pipe communicated with the submersible pump; a lower water stop wing ring and an upper water stop wing ring are arranged on the double-ring steel sheath at intervals; the lower water-stopping wing ring is arranged in the foundation mat layer, and the upper water-stopping wing ring is arranged in the water collecting pit. The utility model solves the problems that in the prior art, the water quantity is large, accumulated sand bags can collapse at any time, the construction of subsequent procedures is influenced, and the personal safety is threatened; and solves the problem that the effect of precipitation is not obvious because the open trench is adopted for drainage and the submersible pump is directly put for pumping water in the prior art.

Description

Pit-in-pit double-ring steel sheath dewatering structure

Technical Field

The utility model relates to a construction field especially relates to a hole dicyclo steel sheath precipitation structure in hole.

Background

Along with the gradual development of building forms, the use functions of underground structure parts of buildings are more and more complex, and pits in deep foundation pits, such as water collecting pits, elevator foundation pits and the like are deeper and deeper. When the elevation of the bottom surface of the foundation pit (or the groove) is lower than the underground water level, underground water can continuously infiltrate into the pit to cause slope collapse and reduced foundation bearing capacity. The traditional method comprises the steps of digging a pit, adopting a clear row or building a sand bag, and plastering on the side wall; or adopting a water collecting pit, an elevator foundation pit and other pit peripheral pipe wells for dewatering. The section of the pit in the deep foundation pit is enlarged, the depth is deepened and the number is increased, if the traditional precipitation construction method is adopted to construct the deeper pit in the pit with the local part below the underground water level, the following defects can be generally existed due to the limitation of the site conditions and the self characteristics of the members: 1, the water quantity is large, the accumulated sand bag can collapse at any time, the construction of the subsequent process is influenced, and the personal safety is threatened; 2, the open trench is adopted for water drainage, a submersible pump is directly put for water pumping, and the dewatering effect is not obvious; affecting waterproof construction and foundation slab construction in later period. When pit-in-pit earthwork such as a water collecting pit, an elevator shaft and the like is excavated, the pit-in-pit earthwork is often influenced by underground water and is difficult to excavate, a side slope is difficult to form, and long-term water accumulation at the bottom of the pit influences a cushion layer and waterproof construction. And 3, the precipitation scheme is designed to reduce the water in the foundation pit to 600mm below the bottom of the water accumulation pit as a design basis, the precipitation is carried out on the whole, the local part is encrypted and the precipitation well is deepened, the water inflow of the whole foundation pit is multiplied, and the water pump water amount is increased. The construction difficulty is large, the investment of materials and labor force is large, and the precipitation time is long. In a general consideration, the whole construction period is prolonged only for the anhydrous construction of the foundation trench at the local part, the economic effect is not ideal, and the resource is easily wasted greatly.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pit-in-pit double-ring steel sheath dewatering structure, which solves the problems that in the prior art, the water quantity is large, accumulated sand bags are likely to collapse at any time, the construction of subsequent procedures is influenced, and the personal safety is threatened; and solves the problem that the effect of precipitation is not obvious because the open trench is adopted for drainage and the submersible pump is directly put for pumping water in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a pit-in-pit double-ring steel sheath dewatering structure comprises a foundation cushion layer, a sand-free pipe pre-buried below the foundation cushion layer, gravels filled around the sand-free pipe, a water collecting pit dug above the foundation cushion layer, a double-ring steel sheath arranged between the sand-free pipe and the water collecting pit, a plugging plate arranged on the double-ring steel sheath, a submersible pump arranged in the sand-free pipe and a drain pipe communicated with the submersible pump; a lower water stop wing ring and an upper water stop wing ring are arranged on the double-ring steel sheath at intervals; the lower water-stopping wing ring is arranged in the foundation mat layer, and the upper water-stopping wing ring is arranged in the water collecting pit.

Further preferred technical solution: the lower part of the double-ring steel sheath is positioned in the sand-free pipe, the middle part of the double-ring steel sheath is positioned in the foundation mat layer, and the upper part of the double-ring steel sheath is positioned in the water collecting pit and extends to the upper part of the water collecting pit.

Further preferred technical solution: the plugging plate is a circular steel plate, and the diameter of the plugging plate is matched with the outer diameter of the double-ring steel sheath.

Further preferred technical solution: the center of the plugging plate is provided with an opening for the drainage pipe to pass through.

Further preferred technical solution: the sump includes a sump bottom plate and a sump top plate.

Further preferred technical solution: and the lower water-stopping wing ring is welded below the double-ring steel sheath and is positioned 100mm below the top surface of the foundation cushion layer.

Further preferred technical solution: the upper stop hydrofoil ring is welded above the double-ring steel sheath and is positioned in the middle of the sump.

Compared with the prior art, the utility model has the following characteristics and beneficial effect:

1, the utility model discloses set up dicyclo steel sheath, dicyclo steel sheath sets up upper and lower stagnant water wing ring, and waterproof to the sump pit is duplicate protection, and the sump pit water-proof effects is better, does benefit to the sump pit side slope and takes shape, guarantees follow-up bed course and construction quality such as waterproof.

2, the utility model discloses set up no sand pipe and rubble in basic bed course below, no sand pipe and rubble drainability are good, and the water that collects in the no sand pipe is through incessant outside pumping of immersible pump, reaches the precipitation purpose, construction easy operation, and construction convenience is swift, and precipitation is effectual, and input material is few, and the efficiency is high, practices thrift the labour, practices thrift the time limit for a project.

3, the utility model discloses in all do not have sand pipe and dicyclo steel sheath all apply in the basis secretly, foundation ditch size, shape are not influenced, each process can the cross operation for the overall construction progress.

Drawings

Fig. 1 is a schematic diagram of the pit-in-pit double-ring steel sheath precipitation structure of the utility model.

Fig. 2 is a schematic view of the double-ring steel sheath of the present invention.

Reference numerals: the water-saving device comprises 1-a sand-free pipe, 2-a lower water-stopping wing ring, 3-an upper water-stopping wing ring, 4-a plugging plate, 5-a double-ring steel sheath, 6-a drainage pipe, 7-a submersible pump, 8-gravel, 9-a sump bottom plate, 10-a sump top plate, 11-a foundation cushion layer and 12-a sump.

Detailed Description

Referring to fig. 1, the embodiment of the water lowering structure with the double-ring steel sheaths for the pit-in-pit comprises a foundation mat layer 11, a sand-free pipe 1 pre-embedded below the foundation mat layer 11, gravels 8 filled around the sand-free pipe 1, a water collecting pit 12 dug above the foundation mat layer 11, a double-ring steel sheath 5 arranged between the sand-free pipe 1 and the water collecting pit 12, a plugging plate 4 arranged on the double-ring steel sheath 5, a submersible pump 7 arranged in the sand-free pipe 1 and a water discharging pipe 6 communicated with the submersible pump 7; a lower water stop wing ring 2 and an upper water stop wing ring 3 are arranged on the double-ring steel sheath 5 at intervals; the lower water stop wing ring 2 is arranged in the foundation bed layer 11, and the upper water stop wing ring 3 is arranged in the water collecting pit 12.

Referring to fig. 2, the double-ring steel sheath 5 is made of a steel pipe with a diameter of 150 mm; the lower water-stopping wing ring 2 is made of a double-layer steel plate with the thickness of 3mm, the width of the lower water-stopping wing ring is 100mm, the lower water-stopping wing ring is welded below the double-ring steel sheath 5, and the lower water-stopping wing ring 2 is located 100mm below the top surface of the foundation cushion layer 11; the upper water stop wing ring 3 is made of a double-layer steel plate with the thickness of 3mm, the width is 100mm, and the upper water stop wing ring 3 is positioned in the middle of the sump 12.

The lower part of the double-ring steel sheath 5 is positioned in the sand-free pipe 1, the middle part is positioned in the foundation mat layer 11, and the upper part is positioned in the water collecting pit 12 and extends to the upper part of the water collecting pit.

The specification of the double-ring steel sheath 5 is determined according to specific construction requirements, and the specification can be as follows: the wall thickness of the double-ring steel sheath 5 is 600mm, the height is 1050mm, and the distance between the upper water stopping wing ring and the lower water stopping wing ring is 400 mm; the wall thickness of the double-ring steel sheath 5 is 700mm, the height is 1150mm, and the distance between the upper water stopping wing ring and the lower water stopping wing ring is 450 mm; the wall thickness of the double-ring steel sheath 5 is 900mm, the height is 1350mm, and the distance between the upper water stopping wing ring and the lower water stopping wing ring is 550 mm; the double-ring steel sheath 5 has the wall thickness of 1000mm, the height of 1450mm and the distance between the upper water stop wing ring and the lower water stop wing ring of 600 mm.

The working procedures can be operated in a cross way, and a foundation cushion layer can be constructed and laid to prevent water while pumping water, so that the construction of a foundation slab concrete structure is carried out; the double-ring steel sheath is double-protection for foundation pit water resistance, and the foundation pit water resistance effect is good.

The sand-free pipe 1 is a steel pipe with the diameter of 300 mm; at least one of the water collecting pit and the elevator shaft foundation pit is placed, the periphery of the sand-free pipe is backfilled to the elevation of the foundation mat layer by using broken stones, shallow well precipitation is increased, the sand-free pipe and the broken stones are adopted in the water filtering layer, and the water filtering effect is good.

The plugging plate 4 is a circular steel plate, and the diameter of the plugging plate is adapted to the outer diameter of the double-ring steel sheath 5; the center of the plugging plate 4 is provided with an opening for the drainage pipe 6 to pass through.

The submersible pump is a self-suction submersible pump with the lift of 15 meters and the diameter of 32 mm; the water is pumped by the submersible pump 7 to reach the local water level reduction.

Sump 12 includes sump floor 9 and sump ceiling 10.

The utility model can independently precipitate water in pits such as a sump pit and an elevator shaft under the conditions of integral precipitation and no deepening and encryption of a precipitation well; the non-sand pipe is pre-buried at the bottom of sump pit, elevator foundation ditch, the immersible pump is put in the non-sand pipe, puts dicyclo steel sheath in the non-sand pipe upper port, utilizes the immersible pump to draw water and reaches local reduction water level, and the drainage well seals before bottom plate concrete placement is accomplished, reaches the effect that pit base does not have the bright water in pits such as sump pit, elevator foundation ditch in the deep basal pit, and the bottom plate is waterproof and the effect that the bed course does not come up before pouring the bottom plate.

The utility model overcomes the traditional precipitation effect of pit in the foundation ditch pit is not obvious, influences the foundation slab construction in waterproof construction and later stage, and precipitation time is long, and economic effect is unsatisfactory, causes the very big extravagant difficult problem of resource.

The utility model discloses can extensively be applicable to in ground foundation bed course department continuously appears a large amount of groundwater, under the ponding especially serious condition in the hole such as sump pit and elevator foundation ditch, in the construction of the control groundwater come-up during from clearance of foundation ditch to bottom plate concrete pouring completion.

Combine the characteristics of engineering example, adopt the utility model discloses hole dicyclo steel sheath precipitation structure in the hole reaches the effect that no bright water in hole base in the pit such as sump pit, elevator pit in the deep basal pit, and the bottom plate is waterproof and the effect that the bed course does not come up before pouring at the bottom plate, and precipitation is respond well, can shorten the time limit for a project greatly and save the cost.

The utility model discloses pit-in-pit dicyclo steel sheath precipitation structure's work progress, the step is as follows:

the method comprises the following steps: dig a 1.5 meters deep hole under the hole middle part in the pit such as sump pit, elevartor shaft, minimum radius is 600mm and is the funnel type, 300 mm's drainage sand-free pipe on the ground is put into to the middle part, the sand-free pipe sets up two sections, the sand-free pipe is peripheral to be backfilled to the base mat layer bottom elevation with the rubble, 15 meters immersible pump of lift phi 32mm bore is placed to the sand-free intraductal, the drain pipe with the immersible pump intercommunication stretches out the foundation ditch, the discharged water is at the foundation ditch upper shed advanced and is gone into the steel sheet header tank, then take out outside the sump pit with the water pump.

The shallow well precipitation is increased, the water filtering layer adopts a sand-free pipe and broken stones, and the water filtering effect is good.

Step two: after the water in the foundation pit is discharged, broken stones with the size not smaller than 200mm are paved on the lower side of the foundation cushion layer to guide water, and then the foundation cushion layer concrete is poured.

Step three: when the foundation cushion concrete is constructed, a double-ring steel sheath is placed into the foundation cushion concrete and inserted into a water-filtering sand-free pipe, the lower water-stopping wing ring is a first water-stopping wing ring and is arranged below the foundation cushion by 100mm, the upper water-stopping wing ring is a second water-stopping wing ring and is arranged in the middle between a bottom plate of a sump and a top plate of the sump, and the lower water-stopping wing ring and the foundation cushion are poured together; the submersible pump continuously pumps water in the sand-free pipe until the concrete foundation construction is finished and the double-ring steel sheath is plugged.

When the cushion concrete is constructed, the double-ring steel sheath is placed into the water-filtering sand-free pipe, all the processes can be operated in a crossed manner, and when water is pumped, the cushion can be constructed, laid and waterproof, so that the foundation slab concrete structure construction is carried out.

Step four: and (2) performing side wall construction after the foundation mat is poured, constructing the side wall by adopting a comprehensive method of a stone bag building mode and a brick building mode, stacking upwards from the foundation mat, widening the bottom, stacking upwards according to an angle of 80 degrees, wherein each stacked bag is not less than 2 bags, reserving a 50-80 mm steel plate mesh fine stone ash surface during stacking, and draining water during stacking to control the water level to be kept below the foundation mat.

Step five: and (3) waterproof layer construction: and (4) constructing the waterproof large-area construction according to a design confirmation diagram, constructing the waterproof part of the double-ring steel sheath to the lower internal corner of the upper water-stopping wing ring upwards along the steel pipe, and constructing a waterproof protective layer after the waterproof layer is constructed.

Step six: constructing reinforced concrete of a foundation slab: the foundation slab reinforcing steel bars and concrete are constructed according to the construction process standard, the reserved drain pipes and the waterproof layers outside the reserved sleeves need to be protected during construction, the water level is kept and controlled below the cushion layer during construction of the waterproof layers and the foundation slab, meanwhile, the drain pipes and the power lines need to be protected, and the foundation slab reinforcing steel bars and the concrete are erected independently to avoid damage.

Step seven: sealing of the drainage well: and (3) sealing the well when the concrete of the foundation bottom plate is poured to the position 2/3 of the plate thickness, cutting off a power supply before sealing, then cutting off a power supply line and a water pumping pipe in the pipe at the upper opening of the protective sleeve, immediately pouring the sleeve by using the impervious concrete of the bottom plate, pouring the inside of the sand-free pipe and the inside of the sleeve to be compact completely, vibrating by using a vibrating rod of 50 degrees, taking out the submersible pump in the sand-free pipe without taking out the submersible pump, after confirming that the vibrating is compact, sealing the inner side of the upper opening of the double-ring steel protective sleeve by using a sealing plate in a full-welding manner, and then continuously pouring the concrete of the bottom plate.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (7)

1. The utility model provides a hole dicyclo steel sheath precipitation structure in hole which characterized in that: the sand-free water treatment device comprises a foundation mat layer (11), a sand-free pipe (1) pre-buried below the foundation mat layer (11), gravels (8) filled around the sand-free pipe (1), a sump (12) dug above the foundation mat layer (11), a double-ring steel sheath (5) arranged between the sand-free pipe (1) and the sump (12), a plugging plate (4) arranged on the double-ring steel sheath (5), a submersible pump (7) arranged in the sand-free pipe (1) and a drain pipe (6) communicated with the submersible pump (7); a lower water stop wing ring (2) and an upper stop wing ring (3) are arranged on the double-ring steel sheath (5) at intervals; the lower water-stopping wing ring (2) is arranged in the foundation cushion layer (11), and the upper water-stopping wing ring (3) is arranged in the water collecting pit (12).

2. The pit-in-pit double-ring steel sheath water lowering structure of claim 1, wherein: the lower part of the double-ring steel sheath (5) is positioned in the sand-free pipe (1), the middle part is positioned in the foundation mat layer (11), and the upper part is positioned in the water collecting pit (12) and extends to the upper part of the water collecting pit (12).

3. The pit-in-pit double-ring steel sheath water lowering structure of claim 1, wherein: the plugging plate (4) is a circular steel plate, and the diameter of the plugging plate is adapted to the outer diameter of the double-ring steel sheath (5).

4. The pit-in-pit double-ring steel sheath water lowering structure of claim 1, wherein: the center of the plugging plate (4) is provided with a hole for the drainage pipe (6) to pass through.

5. The pit-in-pit double-ring steel sheath water lowering structure of claim 1, wherein: the sump (12) comprises a sump bottom plate (9) and a sump top plate (10).

6. The double-ring steel jacket water lowering structure of the pit-in-pit according to any one of claims 1 to 5, wherein: the lower water-stopping wing ring (2) is welded below the double-ring steel sheath (5) and is positioned 100mm below the top surface of the foundation mat layer (11).

7. The double-ring steel jacket water lowering structure of the pit-in-pit according to any one of claims 1 to 5, wherein: the upper water stopping wing ring (3) is welded above the double-ring steel sheath (5) and is positioned in the middle of the sump (12).

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