CN221142830U - Quick dewatering device of foundation ditch substrate layer - Google Patents

Abstract

The rapid water-reducing device for the foundation pit bottom soil layer is characterized by comprising a water filtering box and a water pumping pipe; the water filtering box is a flat box with thickness smaller than length and height, an opening is arranged at the top, a downward tip is arranged at the bottom, bridge type water filtering holes which are opened at two sides and communicated with the inside of the water filtering box are formed in the periphery, a first filter screen is arranged on the inner side of the bridge type water filtering holes, and medium coarse sand filter materials are arranged on the inner side of the first filter screen; one end of the water suction pipe is arranged in the water filtering box, and the other end of the water suction pipe extends out of the water filtering box and is connected with the water suction pump; the water pumping pipe arranged in the water filtering box is positioned at a position adjacent to the tip end, the water pumping pipe is arranged at the inner side of the first filter screen and is arranged in the medium coarse sand filter material, water seepage holes are formed in the pipe wall, and the second filter screen is fully wrapped on the outer wall of the pipe. The construction is simple, the construction speed is high, the disturbance to the soil layer is small, and the influence on the subsequent construction is small; the catchment area is large, and the precipitation effect is good; simple structure and easy manufacture.

Description

Quick dewatering device of foundation ditch substrate layer

Technical Field

The utility model relates to the technical field of foundation pit dewatering, in particular to a rapid dewatering device for a foundation pit bottom soil layer.

Background

The 7.3.2 rule of the technical regulations of supporting the foundation pit of the building (JGJ 120-2012) states that the water level in the foundation pit after precipitation is lower than 0.5m below the pit bottom. However, when there is a fine powder sand or clay layer below the substrate and a large range of fine powder clay or clay layers are distributed at the lower part, because the fine powder sand or clay layer is permeable to water and the fine powder clay or clay layer has water-blocking property, a local water stagnation area tends to occur. Groundwater in the stagnant water area cannot be discharged through existing dewatering wells around, and the original dewatering wells are designed and arranged in the area to fail. The water can not fall down, the foundation bed course and foundation pouring construction of the next step can not be carried out in a short period of time in the area, and once equipment such as an excavator and personnel disturbance of the fine sand layer of the stagnant water area occurs, the characteristics similar to that of rubber soil, the foundation soil layer is destroyed, so that the construction progress is greatly influenced, and certain economic loss is possibly caused. This situation is common in yellow river alluvial formations.

The paper simple analysis shallow water stagnation reason and treatment measure (journal building construction) adopts a comprehensive water-reducing and draining method which is provided with a precipitation well point and a local light well point for secondary precipitation and combines water collection and surface drainage in the pit. However, the method is long in time consumption, large in disturbance on the fine sand layer of the substrate, small in water accumulation surface of the drilled hole, poor in precipitation effect, high in cost and the like, and cannot meet the requirement of rapid precipitation of the foundation pit bottom.

At present, a pipe well commonly used in foundation pit dewatering adopts a bridge type drainage steel pipe or a sand-free concrete pipe, a drilling machine is required to be used for constructing a drilling hole, then the bridge type drainage steel pipe or the sand-free concrete pipe is installed in the drilling hole, dewatering is carried out, the method is suitable for construction before foundation pit excavation, and obviously is not suitable for dewatering of stagnant water in foundation pit bottom soil layers. A tubular well filter device for a fine sand formation is disclosed as in patent document CN 211172037U.

Therefore, there is an urgent need for a precipitation device that can avoid using mechanical equipment such as a drilling machine or an excavator that greatly disturbs a soil layer, has small disturbs on fine sand or a silt layer, has a large catchment area, has a short construction time, and can rapidly remove water in a stagnant water region in a short time.

Disclosure of utility model

Aiming at the problems and the defects existing in the prior art, the utility model provides a rapid water-reducing device for a foundation pit bottom soil layer.

The technical scheme of the utility model is as follows:

The rapid water-reducing device for the foundation pit bottom soil layer is characterized by comprising a water filtering box and a water pumping pipe; the water filtering box is a flat box with thickness smaller than length and height, an opening is arranged at the top, downward tips are arranged at the bottom, bridge type water filtering holes are formed in the periphery, a first filter screen is arranged on the inner side of the first filter screen, and medium-coarse sand filter materials are arranged on the inner side of the first filter screen; the two sides of the bridge type water filtering hole are opened and communicated with the inside of the water filtering box; one end of the water suction pipe is arranged in the water filtering box, and the other end of the water suction pipe extends out of the water filtering box and is connected with the water suction pump; the water pumping pipe arranged in the water filtering box is positioned at a position adjacent to the tip end, the water pumping pipe is arranged at the inner side of the first filter screen and is arranged in the medium coarse sand filter material, and water seepage holes are arranged on the pipe wall.

The drainage box comprises a first drainage plate, a second drainage plate and a blocking plate, wherein the first drainage plate and the upper portion of the second drainage plate are vertically arranged at intervals in parallel, the lower end of the first drainage plate and the upper portion of the second drainage plate are inwards bent and spliced into a sharp corner, the blocking plate is fixedly connected to the two ends of the first drainage plate and the second drainage plate in the length direction, the blocking plate and the first drainage plate and the second drainage plate jointly enclose into a flat box with a tip at the bottom of an opening at the top, and bridge type drainage holes are formed in the side wall of the flat box.

Preferably, the first drainage plate and the second drainage plate are symmetrically arranged, and the sharp angle is a middle sharp angle, namely the sharp angle is positioned at the middle position of the lower end surface.

Preferably, the bridge drainage holes are in a chamfer shape. The resistance can be reduced when the device is used for the deer pattern layer.

The drainage plate top outside is equipped with the pressure-bearing pterygoid lamina, extends perpendicularly outside with the drainage plate, pressure-bearing pterygoid lamina top is connected with the reinforcing plate, the reinforcing plate is equipped with a plurality ofly along drainage box length direction interval.

In order to improve strength and wear resistance, a reinforced blade foot corresponding to the sharp corner shape is arranged below the drainage plate.

The top of the water filtering box is provided with a handle which is positioned at two ends of the water filtering box in the length direction. And is gripped when being pressed into the pattern layer with the device.

The second filter screen is fully wrapped outside the water pumping pipe and is used for placing the blockage of the water pumping pipe.

The water suction pipe is arranged in a U-shaped manner in the water filtering box, the horizontal section is positioned at the bottom of the water filtering box, the top end of one vertical section is closed, and the other vertical section extends upwards out of the top surface of the water filtering box and is used for being connected with a water suction pump, wherein water seepage holes are formed in the horizontal section and the vertical section which is not connected with the water suction pump. The pore diameter of the water seepage hole is preferably 3-5mm.

The beneficial effects of the utility model are as follows:

1. The hammer is pressed into the fine sand layer in a pressing-in mode or a hammer is used for small striking, and only manual work and the hammer are needed. If the soil layer hardness is bigger, the small shovel can be used for digging out the thin groove in advance, and the precipitation device is buried into the fine sand layer, so that the disturbance is smaller. Large-scale equipment is not needed, severe disturbance of the equipment to the foundation pit bottom soil layer is avoided, the construction is simple, the construction speed is high, and the influence on subsequent construction is small. The problem of water stagnation in the foundation pit bottom soil layer can be well solved.

2. The bridge type water filtering holes are in an inverted triangle form, and the resistance is small when the bridge type water filtering holes are pressed into a soil layer.

3. The plane catchment area is big, and precipitation effect is far greater than the drilling, can get rid of the water of stagnant water district fast in the short time, saves the time limit for a project.

4. The pumping pipe can be directly connected with the self-priming pump or the hand pump to discharge water, and a plurality of precipitation devices can be connected to a main pumping pipe, and the main pumping pipe is connected with the self-priming pump or the hand pump, so that the pumping mode is flexible and is suitable for water stagnation areas with different ranges.

5. The method can simply manufacture finished products for standby, and is beneficial to popularization in the foundation pit construction industry.

6. After the precipitation work is finished, the device is easy to pull out, can be reused, and has low economic cost.

Drawings

FIG. 1 is a schematic diagram of an embodiment;

FIG. 2 is a cross-sectional view taken along section A-A of FIG. 1;

FIG. 3 is a perspective view of the water filter cartridge;

FIG. 4 is a cross-sectional view of the cartridge;

FIG. 5 is a schematic diagram of a plurality of such devices in parallel;

The components represented by the reference numerals in the figures are:

1. A water filtering box; 111. bridge type water filtering holes; 11a, a first drain plate; 11b, a second drain plate; 12. a closure plate; alpha, sharp angle; 13. pressure-bearing wing plates; 14. a reinforcing plate; 15. reinforcing rib plates; 2. a water pumping pipe; 3. a first filter screen; 4. medium coarse sand filter materials; 5. a second filter screen; 6. a handle; 7. strengthening the blade foot.

Detailed Description

The technical means adopted to achieve the intended purpose of the present utility model will be further described below with reference to the accompanying drawings in the embodiments of the present utility model.

Referring to fig. 1 and 2, a rapid water-lowering device for foundation pit bottom soil layer comprises a water filtering box 1 and a water pumping pipe 2.

The water filtering box 1 is a cuboid-like flat box with the length and height dimensions far greater than the thickness dimension, an opening is formed in the top, a downward tip is arranged at the bottom, bridge-type water filtering holes 111 are formed in the periphery, a first filter screen 3 is paved on the inner side of the water filtering box, and a medium coarse sand filter material 4 is arranged on the inner side of the first filter screen 3. The first filter screen 3 is preferably a nylon filter screen of 80-100 mesh size. The medium-coarse sand filter material 4 has the advantages that the water permeability is good, the porosity of the filter material is larger than that of the fine sand layer, and the underground water can quickly permeate. The bridge type water filtering holes are opened at two sides and are communicated with the inside of the water filtering box, and when precipitation occurs, water in the silt or fine sand layer firstly enters the water filtering box through the bridge type water filtering holes and then enters the water pumping pipe after being filtered through the first filter screen and the medium coarse sand filter material. The bridge type water filtering holes are arranged at intervals along the periphery of the water filtering box, can be uniformly distributed or arranged in a quincuncial shape, and the specific arrangement form is not limited.

One end of the water suction pipe 2 is arranged in the water filtering box 1, and the other end extends out of the water filtering box 1 and is connected with a water suction pump; one end arranged in the water filtering box 1 is positioned at a position adjacent to the tip end, the inner side of the first filter screen 3 is arranged in the medium coarse sand filter material 4, and water seepage holes are arranged on the pipe wall.

Referring to fig. 3, the water filtering box 1 includes a first water draining board 11a, a second water draining board 11b and a blocking board 12, wherein the first water draining board and the upper portion of the second water draining board are vertically arranged at intervals in parallel, the lower end is bent inwards and spliced into a sharp angle α, the blocking board 12 is fixedly connected to two ends of the first water draining board and the second water draining board in the length direction, and forms a flat box with a tip at the bottom of the top opening together with the first water draining board and the second water draining board, and a bridge type water filtering hole 111 is arranged on the side wall of the flat box.

The bottom tip position of the flat box is not limited, and the tip may be a middle tip or an inclined tip, that is, the tip position may be at a middle position of the lower end surfaces of the first drain plate 11a and the second drain plate 11b or may deviate from one side. Or one of the first drainage plate and the second drainage plate is a vertical plate, the other is vertical at the upper part, and the lower part is bent inwards and then spliced into a single-side inclined tip.

Preferably, the first drainage plate and the second drainage plate are symmetrically arranged, and the sharp angle is a middle sharp angle, namely the sharp angle is positioned at the middle position of the lower end surface. The first drainage plate 11a and the second drainage plate 11b can be made of steel plates, the lower edges of the two drainage plates are bent for 15 degrees, the upper parts of the two drainage plates are kept parallel, the two drainage plates are welded in pairs to form tips, and the inner distance between the two steel plates is 5cm. And then the closure plates 12 are welded at both ends. The first drain plate 11a and the second drain plate 11b are welded with the closure plate 12 to form the flat box-shaped water filtering box 1, the top of the water filtering box is provided with an opening, and the lower part of the water filtering box is provided with a tip. The inside is arranged in placing first filter screen and well coarse sand filter material, and the setting of pointed end makes things convenient for drainage box 1 to adopt the mode of impressing or the less hits of weight to put into the fine sand layer of powder, reduces the violent disturbance to foundation ditch substrate layer, and the construction is simple, and construction speed is fast. The water filtering box 1 can be manufactured by adopting a steel plate welding mode, can also be manufactured by adopting an integrated forming mode, such as casting and the like, so long as the novel structure and the novel function can be realized, and the specific processing mode is not limited. The bridge type water filtering hole 111 is opened at both sides and is communicated with the inside of the water filtering box 1, and can be manufactured by adopting a punching mode.

Referring to fig. 3, in order to enhance the drainage efficiency, the bridge type drainage hole 111 is also provided in the closure plate 12.

As shown in fig. 3 and 4, the bridge drainage holes 111 are preferably inverted triangle-shaped in order to reduce resistance when the drainage box 1 is pressed down into the foundation pit.

Referring to fig. 3, the top of the drainage plate 11 is provided with a pressure-bearing wing plate 13, which is arranged outside the top of the drainage plate 11 and extends outwards perpendicularly to the drainage plate 11, and the pressure-bearing wing plates 13 on the two drainage plates 11 are symmetrical, so that pressure can be applied on the two drainage plates, for example, a flat box-shaped dewatering device can be pressed into a fine sand layer by stepping on the flat box-shaped dewatering device. Reinforcing rib plates 15 are welded on the outer side of the joint of the lower side of the pressure-bearing wing plate 13 and the drain plate 11, and the reinforcing rib plates 15 are triangular in shape. For improving the strength of the pressure-bearing wing plate 13.

The reinforcing plate 14 is connected above the pressure-bearing wing plate 13, and the reinforcing plate 14 is provided with three reinforcing plates at intervals along the length direction of the water filtering box 1. The reinforcing plate 14 may be made of a material having high strength, such as a steel plate. Bolt holes are formed in the reinforcing plate 14 and the pressure-bearing wing plate 13, and the reinforcing plate 14 is fastened to the pressure-bearing wing plate 13 by bolts. The function of reinforcing the overall rigidity and lateral strength of the water filter cartridge 1 is achieved.

As shown in fig. 2, the sharp corner of the lower end of the drain plate 11 is welded with a reinforced blade foot 7 corresponding to the shape of the sharp corner. The function is to improve the wear resistance of the water filtering box 1 and the shearing force when the water filtering box is pressed into the fine sand, so that the flat box-shaped precipitation device is easy to be pressed into the fine sand layer by at least 0.5m, and the precipitation depth range meets the specification of the technical regulations for supporting building foundation pit (JGJ 120-2012).

Referring to fig. 1 and 2, the top of the filter cartridge 1 is provided with handles 6 at both ends in the length direction thereof. The handle 6 is made of steel pipes or steel bars, is welded on the top of the blocking plate 12, and is vertically upwards used as an armrest when the water box 1 is pressed and filtered.

Referring to fig. 2, in order to prevent the water suction pipe 2 from being blocked, the water suction pipe 2 is entirely wrapped with a second filter screen 5. The second filter screen 5 is preferably a nylon filter screen with a specification of 80-100 meshes.

See fig. 1, the water suction pipe 2 is arranged in a U-shaped manner with an upward opening in the water filtering box 1, wherein the horizontal section is positioned at the bottom of the water filtering box 1, the top end of the right vertical section is closed, the left vertical section extends out of the top surface of the water filtering box 1 upward and is used for being connected with a water suction pump, a valve is arranged on a pipe section close to the water suction pump, and water seepage holes are arranged on the horizontal section and the right vertical section of the U-shaped section of the water suction pipe 2. The diameter of the water suction pipe 2 can be 20-30mm, the water suction pipe is made of a PVC pipe or a steel pipe, water seepage holes are processed on the pipe wall, the aperture of the water seepage holes is preferably 3-5mm, and groundwater is convenient to enter the water suction pipe 2. The water suction pipe 2 may be provided in the water filtering box 1 in plurality as needed.

When the foundation pit is drained, the dewatering device is pressed into the fine sand layer, specifically, a heavy hammer less striking mode can be adopted, or a small spade can be adopted to dig out a thin groove in advance, and then the device is buried into the fine sand layer, so that the water filtering box 1 is pressed into the fine sand layer at least 0.5m deep. Then the pipe section of the water suction pipe 2 exposed out of the water filtering box 1 is connected with a water suction pump, the water suction pump is started, so that underground water sequentially flows through bridge type water filtering holes 111, a first filter screen 3, a medium coarse sand filter material 4, a second filter screen 5 and water seepage holes on the water filtering box 1 to enter the water suction pipe 2, and then the underground water is discharged outwards by the water suction pump.

Referring to fig. 5, the device can be used together by connecting a plurality of parallel connection, the water suction pipe 2 is connected with an external total water suction pipe through accessories such as an elbow tee joint, and the total water suction pipe is connected with a water suction pump again, so that water discharged by a plurality of precipitation devices is collected and discharged, and the precipitation efficiency is improved.

While the preferred embodiments of the present utility model have been described above, the present utility model is not limited to the above embodiments and examples, and various changes, equivalent substitutions, modifications and the like, which are within the knowledge of those skilled in the art, are intended to be included within the scope of the present utility model without departing from the spirit of the present utility model.

Claims (10)

1. The utility model provides a foundation ditch substrate layer falls water installation fast which characterized in that includes:

The water filtering box (1), the water filtering box (1) is a flat box with thickness smaller than length and height, the top is provided with an opening, the bottom is provided with a downward tip, bridge type water filtering holes (111) are formed in the periphery, a first filter screen (3) is arranged on the inner side of the first filter screen, and a medium coarse sand filter material (4) is arranged on the inner side of the first filter screen; the two sides of the bridge type water filtering hole (111) are open and are communicated with the inside of the water filtering box;

One end of the water suction pipe (2) is arranged in the water filtering box (1), and the other end of the water suction pipe extends out of the water filtering box (1) and is connected with the water suction pump; the water pumping pipe (2) arranged in the water filtering box is positioned at a position adjacent to the tip end, the inner side of the first filter screen (3) is arranged in the medium coarse sand filter material (4), and water seepage holes are arranged on the pipe wall.

2. The precipitation device according to claim 1, wherein the water filtering box (1) comprises a first water draining plate (11 a), a second water draining plate (11 b) and a blocking plate (12), the first water draining plate (11 a) and the upper portion of the second water draining plate (11 b) are vertically arranged at intervals in parallel, the lower end of the first water draining plate is inwards bent and spliced into a sharp corner (alpha), the blocking plate (12) is fixedly connected to two ends of the first water draining plate (11 a) and the second water draining plate (11 b) in the length direction, the blocking plate and the first water draining plate (11 a) and the second water draining plate (11 b) jointly enclose a flat box with a tip at the bottom of a top opening, and bridge type water filtering holes (111) are formed in the side wall of the flat box.

3. Precipitation unit according to claim 2, wherein the first drainage plate (11 a) and the second drainage plate (11 b) are symmetrically arranged, and the sharp angle is a middle sharp angle, i.e. the sharp angle is located in the middle of the lower end surface.

4. A precipitation unit according to claim 3, wherein the bridge drainage apertures (111) are triangular in shape.

5. The precipitation device according to claim 2, wherein the outer side of the top of the drain plate (11) is provided with a pressure-bearing wing plate (13) which extends outwards perpendicular to the drain plate (11), a reinforcing plate (14) is connected above the pressure-bearing wing plate (13), and a plurality of reinforcing plates (14) are arranged at intervals along the length direction of the water filtering box (1).

6. Precipitation unit according to claim 2, characterized in that the drain plate is provided underneath with a strengthening blade foot (7) corresponding to the pointed shape.

7. Precipitation device according to claim 1, characterized in that the top of the water filter cartridge (1) is provided with handles (6) at both ends in the length direction thereof.

8. Precipitation unit according to any of claims 1-7, wherein the water suction pipe (2) is totally enclosed by a second filter screen (5).

9. Precipitation unit according to claim 8, characterized in that the water suction pipe (2) is arranged in a U-shape in the water filter box (1), the horizontal section is located at the bottom of the water filter box (1), the top end of one vertical section is closed, the other vertical section extends upwards out of the top surface of the water filter box (1) for connection with a water suction pump, wherein water penetration holes are provided in the horizontal section and in the vertical section not connected with the water suction pump.

10. Precipitation device according to claim 9, wherein the water penetration holes have a pore size of 3-5mm.