CN113756349B

CN113756349B - Foundation pit drainage structure and construction method thereof

Info

Publication number: CN113756349B
Application number: CN202111101277.XA
Authority: CN
Inventors: 严晓静
Original assignee: NINGBO TONGSAN CONSTRUCTION GROUP CO LTD
Current assignee: NINGBO TONGSAN CONSTRUCTION GROUP CO LTD
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-07-05
Anticipated expiration: 2041-09-18
Also published as: CN113756349A

Abstract

The application relates to a foundation pit drainage structure and a construction method thereof, and belongs to the technical field of civil engineering construction. It includes drain ditch, lower drain ditch and drainage well, go up the drain ditch with the drainage well sets up in the top of foundation ditch side slope, go up the drain ditch with the drainage well intercommunication, lower drain ditch sets up in the below of foundation ditch side slope, lower drain ditch is seted up at the foundation ditch end of a hole, install lower drain ditch in the lower drain ditch, lower drain ditch inlay and adorn in lower drain ditch and support the foundation ditch, one side that the foundation ditch side slope was kept away from to lower drain ditch lower part is extended towards the direction of keeping away from the foundation ditch side slope and is provided with the bracing piece. This application has the effect that foundation ditch side slope is difficult to the unstability.

Description

Foundation pit drainage structure and construction method thereof

Technical Field

The application relates to the field of civil engineering construction, in particular to a foundation pit drainage structure and a construction method thereof.

Background

The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. When the foundation pit is excavated, the underground water level is higher than the excavation bottom surface, and underground water can continuously infiltrate into the pit, so that the foundation pit can be constructed under a dry condition to prevent side slope instability, basic quicksand, pit bottom uplift, pit bottom piping and foundation bearing capacity reduction from needing to be subjected to foundation pit precipitation. The foundation pit dewatering method mainly comprises the following steps: open ditch with water collecting well dewatering, light well point dewatering, jet well point dewatering, electroosmosis well point dewatering, deep well point dewatering, etc.

The foundation ditch also needs to set up drainage structures in foundation ditch department after precipitation is accomplished simultaneously to reduce rainwater inflow foundation ditch when later stage construction, current drainage mechanism establishes the escape canal for digging outside the foundation ditch usually, leads unnecessary water to other places through the escape canal, nevertheless digs the escape canal, causes the part associativity that the foundation ditch side slope is located the escape canal both sides to reduce easily, appears the foundation ditch side slope unstability.

Disclosure of Invention

First aspect, in order to carry out better drainage under the condition that foundation ditch side slope is difficult to the unstability, this application provides a foundation ditch drainage structure, adopts following technical scheme:

the utility model provides a foundation ditch drainage structures, includes last ditch, lower ditch and drainage well, go up the ditch with drainage well sets up in the top of foundation ditch side slope, go up the ditch with drainage well intercommunication, lower ditch sets up in the below of foundation ditch side slope, lower ditch is seted up at the bottom of the foundation ditch pit, install down the ditch in the ditch, down the ditch inlay and adorn in lower ditch and support the foundation ditch side slope, one side that the foundation ditch side slope was kept away from to lower ditch lower part is extended towards the direction of keeping away from the foundation ditch side slope and is provided with the bracing piece.

Through adopting above-mentioned technical scheme, through set up the underdrain ditch and install the underdrain ditch in the below of foundation ditch side slope, support the below of foundation ditch side slope through the underdrain ditch, make the foundation ditch side slope more stable, be difficult to the unstability, the rainwater at the bottom of the foundation ditch hole can be collected to the underdrain ditch, make the slope end of basic side slope be difficult to ponding, thereby the stability of better retaining foundation ditch side slope, the underdrain ditch is used for cutting off foundation ditch outlying rivers and goes into the foundation ditch, send water into the drainage well through the underdrain ditch, then can draw water and precipitation operation through the drainage well, the bracing piece that the underdrain ditch set up is passed through the slant extension simultaneously, thereby more firm installs the underdrain ditch in the underdrain ditch, the underdrain ditch is better supports the side slope.

Optionally, an inclined strut supporting rod is arranged between the upper drainage ditch and the lower drainage ditch, an upper drainage ditch is installed in the upper drainage ditch, the inclined strut supporting rod is inserted into a foundation pit slope, and the inclined strut supporting rod is located between the lower part of the upper drainage ditch and the upper part of the lower drainage ditch.

Through adopting above-mentioned technical scheme, install the drainage channel in the ditch of going up drainage, make the water of assembling the escape canal be difficult to the infiltration down, thereby better leading-in drainage well of water, the bracing pole that sets up between ditch and the lower drainage ditch of going up drainage, make and go up drainage channel and lower drainage channel interrelatedly, go up the drainage channel and lead into drainage channel under a part of power through bracing pole, at last the hole end of leading-in foundation ditch through lower drainage channel, reduce the last drainage channel transmission power that the foundation ditch side slope received, the foundation ditch side slope is more stable.

Optionally, a plurality of flow guide supporting rods are arranged outside the diagonal support supporting rod, the flow guide supporting rods are spirally arranged along the length direction and the circumferential direction of the diagonal support supporting rod, and one side of each flow guide supporting rod along the spiral direction is provided with a blade edge.

Through adopting above-mentioned technical scheme, through set up the water conservancy diversion bracing piece outside bracing piece, on the one hand, the water conservancy diversion bracing piece inserts in the soil of foundation ditch side slope, thereby form the support chassis in the soil of foundation ditch side slope, support the foundation ditch side slope better through the water conservancy diversion bracing piece, the water conservancy diversion bracing piece can provide certain counter-force to the soil of foundation ditch side slope and support, the water conservancy diversion bracing piece has certain rainwater water conservancy diversion effect again simultaneously, guide the rainwater to bracing piece, then prop up bracing piece water conservancy diversion to lower drainage canal department through the bracing, a plurality of water conservancy diversion bracing pieces are arranged along bracing piece spiral simultaneously, and offer the sword limit with the screw direction, make the bracing piece that has the water conservancy diversion bracing piece squeeze into the underground through the form of spiral, easy to assemble.

Optionally, a blind pipe groove is formed in one side, away from the blade edge, of the flow guide supporting rod, the groove bottom of the blind pipe groove is an arc surface, an opening of the blind pipe groove is inclined towards the axis direction of the inclined strut supporting rod relative to the blade edge, and a blind pipe is installed in the blind pipe groove.

Through adopting above-mentioned technical scheme, through seting up the blind pipe groove and installing the blind pipe on the water conservancy diversion bracing piece for the water conservancy diversion effect of water conservancy diversion bracing piece to moisture is better, and the blind pipe groove is seted up in one side that the water conservancy diversion bracing piece deviates from the sword limit and towards the axis direction slope, makes bracing pole when the screw in is underground, and the blind pipe is difficult to receive the power of soil, makes the blind pipe be difficult to drop.

Optionally, the outer wall of the diagonal bracing support rod is spirally provided with a blind pipeline, the spiral direction of the blind pipeline is the same as and staggered with the spiral arrangement direction of the diversion support rod, and the blind pipeline is filled with a blind pipe.

Through adopting above-mentioned technical scheme, set up the blind pipeline through the outer wall spiral at bracing piece, and install the blind pipe in the blind pipeline, make bracing piece can be better guide rivers to the foundation ditch in, the helical direction of blind pipeline is the same and crisscross with the direction that diversion bracing piece spiral was arranged simultaneously, make offering of blind pipeline can not influence the joint strength between diversion bracing piece and the bracing piece, keep the distance of every diversion bracing piece to the blind pipeline, keep certain equilibrium, the diversion bracing piece that blind pipeline both sides received transmits the power of coming keeps steady, make bracing piece be difficult to warp in soil, when keeping better supporting effect, improve the water conservancy diversion effect.

Optionally, last ditch intussuseption is filled with the cobble drainage layer, the geotechnological cloth layer has been laid on the cobble drainage layer and above the foundation ditch side slope, be provided with the waterproof layer under the geotechnological cloth layer, the waterproof layer in cobble drainage layer trompil.

Through adopting above-mentioned technical scheme, through filling the cobble drainage layer in last drainage channel, on the one hand, reduce soil along with the possibility of water loss, on the other hand, fill the cobble drainage layer in last drainage channel, make the height that last drainage channel position department kept with other positions, it is convenient current, through laying the geotechnological cloth layer, make whole foundation ditch upside keep leveling, it is convenient current, the geotechnological cloth layer has water capacity simultaneously, the waterproof layer is still laid in the position outside last drainage channel, make the rainwater pass through the better leading-in drainage channel on geotechnological cloth layer, reduce the rainwater and ooze down.

Optionally, a water pumping pump assembly is arranged on the drainage well, a turbidity detection device is arranged at a water outlet of the water pumping pump assembly, the turbidity detection device comprises a weighing disc and a feedback system, the weighing disc is connected with the flow control of the water pumping pump assembly through the feedback system, a filter hole is formed in the weighing disc, a filter membrane is installed on the filter hole, and a falling hole is formed in the filter membrane.

Through adopting above-mentioned technical scheme, through settling the pump assembly that draws water on the drainage shaft, thereby the water that assembles in the drainage shaft is extracted and is discharged, also carry out precipitation to the foundation ditch simultaneously, be convenient for construction next, simultaneously weigh the husky that contains of drainage water through weighing the dish, the sandy soil in weighing the dish is discharged through the hole that falls down, simultaneously when discharging the sandy soil that transfinites in the short time, gravity feedback to the pump group that weighs the dish through feedback system, through reducing the speed that the pump group drew water, reduce the continuation of sandy soil and take out, thereby on the basis that keeps the pumping water and precipitation, reduce the water head, reduce the sandy soil loss, keep the stability of foundation ditch side slope, thereby can realize the dynamic adjustment of process of drawing water again, with the change that adapts to the environmental change and influence the water level in the drainage shaft.

Optionally, the suction pump assembly comprises a recycling tank, a sedimentation tank is arranged in the recycling tank, the weighing plate is located above the sedimentation tank, a drain pipe communicated with the bottom of the sedimentation tank is arranged on the lower portion of the recycling tank, a separating diaphragm plate is arranged in the sedimentation tank, and the separating diaphragm plate is used for separating the sedimentation tank into a drainage portion and a sand return portion.

By adopting the technical scheme, the sedimentation tank is used for receiving water and sand extracted from the drainage well, separating the sand and the water through the separation membrane plate, conveying the water out of the foundation pit or into the urban drainage system through the drainage pipe to be drained away, and backfilling the drainage well with the sand again, so that the loss of the sand is further reduced.

In order to construct the foundation pit drainage structure, the application provides a construction method of the foundation pit drainage structure, which adopts the following technical scheme:

a construction method of a foundation pit drainage structure comprises the following steps:

1) before excavation of the foundation pit, excavating an upper drainage ditch and a drainage well;

2) installing a drainage channel in the drainage ditch and filling cobblestones into the drainage channel to form a cobblestone water filtering layer;

3) spirally driving an inclined strut supporting rod, and then completing excavation of the foundation pit;

4) after the excavation of the foundation pit is finished, a lower drainage ditch is arranged at the bottom of the foundation pit at the position of the bracing support rod;

5) a lower drainage ditch is arranged in the lower drainage ditch;

6) and a water pumping pump assembly and a turbidity detection device are arranged on the drainage well.

Optionally, step 5) includes:

5.1) forming a support hole for extending the support rod in the lower drainage ditch;

5.2) lower drainage channels are embedded in the lower drainage channel in units, then the units for fixing the lower drainage channels are poured to form a whole, and concrete is poured into the supporting holes to form supporting rods fixed with the lower drainage channels.

Through adopting above-mentioned technical scheme, through pouring out the bracing piece for the bracing piece is connected more firmly with lower drainage canal, and the bracing piece also contacts completely with soil simultaneously, is favorable to the transmission of power.

To sum up, a lower drainage ditch is arranged below a foundation pit side slope and is provided with a lower drainage channel, the lower drainage channel is used for supporting the lower part of the foundation pit side slope, so that the foundation pit side slope is more stable and is not easy to destabilize, the lower drainage channel can collect rainwater at the bottom of the foundation pit, so that the slope bottom of a basic side slope is not easy to accumulate water, and the stability of the foundation pit side slope is better kept, the upper drainage channel is used for preventing water at the periphery of the foundation pit from flowing into the foundation pit, water is sent into a drainage well through the upper drainage channel, then water pumping and precipitation operations can be carried out through the drainage well, the upper drainage channel arranged in the upper drainage channel is used for preventing the collected water from permeating into the ground, a diagonal support is arranged between the upper drainage channel and the lower drainage channel, the upper drainage channel is mutually associated with the lower drainage channel through a diagonal support rod, and finally the upper drainage channel is led into the bottom of the foundation pit, reduce the power that the last irrigation canals and ditches that receive of foundation ditch side slope transmitted, foundation ditch side slope is more stable.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present application;

FIG. 2 is a partial sectional view of a foundation pit slope in an embodiment of the application;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is a schematic view of the installation of the bracing support bar in an embodiment of the present application;

FIG. 5 is a partial schematic structural view of a brace support bar in an embodiment of the present application;

FIG. 6 is a schematic structural view of a pump assembly according to an embodiment of the present application;

figure 7 is a cross-sectional view of the upper portion of the suction tube in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a weighing pan in an embodiment of the present application;

fig. 9 is a sectional view of a recovery tank in the embodiment of the present application.

Description of reference numerals: 1. an upper drainage ditch; 2. a lower drainage ditch; 3. a drainage well; 4. a pump assembly; 41. a water pumping pipe; 411. a flow distribution plate; 42. a water pump; 43. a water outlet pipe; 44. a recycling bin; 441. a guide bar; 442. a sedimentation tank; 4421. a water discharge section; 4422. a sand return part; 443. a drain pipe; 444. returning sand to the pipe; 445. a diaphragm separating plate; 451. a return pipe; 452. adjusting the sleeve; 4521. a return water hole; 4522. adjusting the sliding hole; 4523. a limiting ring; 453. an adjusting block; 5. an upper drainage channel; 51. an upper drainage channel unit; 6. a lower drainage channel; 61. a lower drainage channel unit; 62. a support bar; 63. a support hole; 7. a pebble water filtering layer; 71. a geotextile layer; 72. a waterproof layer; 73. fixing nails; 8. a diagonal brace support bar; 81. a flow guide support rod; 82. blind pipelines; 83. a blind pipe; 84. a blade edge; 85. a blind pipe groove; 91. a weighing pan; 911. a guide edge; 912. a guide hole; 913. filtering holes; 914. filtering the membrane; 915. dropping a hole; 92. a pulley; 93. and (6) adjusting the ropes.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

The embodiment of the application discloses foundation ditch drainage structures.

Referring to fig. 1 and 2, a foundation ditch drainage structures, including last ditch 1, drain 2 down, drainage well 3 and suction pump subassembly 4, last ditch 1 and drain 2 down are seted up respectively in foundation ditch periphery and foundation ditch, last ditch 1 is seted up in the top of foundation ditch side slope, and go up the ditch 1 and encircle the foundation ditch round, drainage well 3 is seted up outside the foundation ditch and is linked together with last ditch 1, the quantity and the position of drainage well 3 can be according to the demand, carry out corresponding selection and set up, 3 quantity of drainage well in this embodiment are four, four drainage well 3 are seted up in the periphery in foundation ditch four corners.

Referring to fig. 1 and 2, an upper drainage channel 5 is embedded in the upper drainage channel 1, the upper drainage channel 5 is composed of a plurality of upper drainage channel units 51, the upper drainage channel 5 and the upper drainage channel 1 have a U-shaped cross section, the plurality of upper drainage channel units 51 are gradually embedded along the upper drainage channel 1, adjacent upper drainage channel units 51 are mutually abutted and concrete is poured for further fixing, so that the upper drainage channel units 51 form the finished upper drainage channel 5.

Referring to fig. 1 and 2, the lower drainage ditch 2 is arranged at the periphery of the bottom of the foundation pit and surrounds a circle, namely, the lower drainage ditch 2 is located below the side slope of the foundation pit, a lower drainage channel 6 is installed in the lower drainage ditch 2, the lower drainage channel 6 is composed of a plurality of lower drainage channel units 61, the lower drainage channel units 61 are embedded in the lower drainage ditch 2, the lower drainage channel units 61 are arranged along the extending direction of the lower drainage channel 6, adjacent lower drainage channel units 61 are mutually abutted and fixed by pouring concrete, so that the lower drainage channel units 61 are mutually fixed to form a complete lower drainage channel 6, a support rod 62 is arranged at one side of the lower part of each lower drainage channel unit 61, which is far away from the side slope of the foundation pit, the support rod 62 is formed by pouring concrete and is integrally fixed with the lower drainage channel units 61, and the support rod 62 is downwards inclined and extends towards the direction far away from the side slope of the foundation pit.

Referring to fig. 2 and 3, the upper drainage channel 5 is filled with cobblestones to form a cobblestone water filtering layer 7, the cobblestone water filtering layer 7 is flush with the surface above the foundation pit, so that the upper drainage channel 5 forms an underdrain for facilitating movement of personnel, a geotextile layer 71 is laid on the cobblestone water filtering layer 7 and on the soil on the upper side of the side slope of the foundation pit, a waterproof layer 72 is arranged under the geotextile layer 71, the waterproof layer 72 is perforated on the cobblestone water filtering layer 7, the geotextile layer 71 extends downwards towards the foundation pit to cover the side slope, one side of the geotextile layer 71 in the foundation pit is positioned in the lower drainage channel 6, the other side of the geotextile layer is fixed through a fixing nail 73, and the fixing nail 73 penetrates through the geotextile layer 71 and is driven into the soil, so that the geotextile layer 71 is reinforced.

Referring to fig. 1 and 4, the foundation pit side slope is embedded with bracing support rod 8, and bracing support rod 8 is whole to be squeezed into under the soil, and bracing piece 62 is located between last ditch 1 and the ditch 2 down, and bracing support rod 8 upper end and the one side butt of the ditch 5 lower part of last ditch towards the foundation pit, bracing support rod 8 lower extreme and the one side butt of the ditch 6 upper portion of lower ditch towards the foundation pit side slope down.

Referring to fig. 4 and 5, the integrative water conservancy diversion bracing piece 81 that is fixed with of bracing pole 8 outer wall, water conservancy diversion bracing piece 81 has a plurality ofly, a plurality of water conservancy diversion bracing pieces 81 are arranged along bracing pole 8 circumference and length direction spiral, blind pipe 82 has been seted up to the outer wall spiral of bracing pole 8 simultaneously, blind pipe runs through the perisporium of bracing pole 8, blind pipe is intraductal to be inlayed and is equipped with blind pipe 83, thereby improve the flow of water in blind pipe 82, and under the water conservancy diversion effect of assembling of blind pipe 83, water assembles back in blind pipe 82 and is difficult to leak, blind pipe 82's cross-section is for taking the circular of breach, make blind pipe 82 be higher than blind pipe 82's bottom in bracing pole 8 perisporium open-ended position, water is more difficult to leak.

Meanwhile, the spiral direction of the blind pipes 82 is the same as and staggered with the spiral arrangement direction of the guide support rods 81, the interval between adjacent guide support rods 81 is 90 degrees, and the distance from each guide support rod 81 to the upper and lower adjacent blind pipes 82 is the same.

Referring to fig. 5, one end of the diversion support rod 81, which is far away from the diagonal support rod 8, inclines towards the spiral ascending direction along the spiral arrangement direction, the side edge of the diversion support rod 81, which deviates from the inclination direction, is set as the edge 84, the cross section of the edge 84 is gradually reduced along the direction to the edge, so that the diagonal support rod 8 can be driven into the ground in a spiral manner, the edge 84 is arranged, so that the diagonal support rod 8 can cut soil when driven into the ground, and the diagonal support rod 8 is driven to rotate more labor-saving.

Referring to fig. 5, blind pipe groove 85 has been seted up to one side that water conservancy diversion bracing piece 81 deviates from sword limit 84, the tank bottom of blind pipe groove 85 is the arc surface, the relative sword limit 84 tilt up of opening of blind pipe groove 85, it is fixed with blind pipe 83 to glue in the blind pipe groove 85, because bracing pole 8 when squeezing into soil, water conservancy diversion bracing piece 81 is the spiral and is advanced downwards, the relative sword limit 84 tilt up of opening of blind pipe groove 85 for soil is difficult to directly to the blind pipe 83 application of force in the blind pipe groove 85, blind pipe 83 is difficult to drop when bracing pole 8 squeezes into soil.

Referring to fig. 1, the quantity of suction pump subassembly 4 is unanimous with the quantity of drainage well 3, settle one set of suction pump subassembly 4 on every drainage well 3, discharge the rainwater in the drainage well 3 through suction pump subassembly 4, on the one hand, the moisture that assembles is sent away, on the other hand, also carry out precipitation to the foundation ditch, suction pump subassembly 4 includes drinking-water pipe 41, suction pump 42, the flow control subassembly, outlet pipe 43 and collection box 44, suction pump 42 is installed on drainage well 3, the water inlet intercommunication of drinking-water pipe 41 one end and suction pump 42, the other end is located and draws water at the bottom of drainage well 3.

Referring to fig. 6 and 7, the flow rate adjusting assembly includes a return pipe 451, an adjusting sleeve 452 and an adjusting block 453, the return pipe 451 is disposed at a position where the pumping pipe 41 is close to the wellhead of the drainage well 3, the return pipe 451 is communicated with the pumping pipe 41, a dividing plate 411 is disposed on an inner wall of the pumping pipe 41, the dividing plate 411 is located above a pipe orifice where the return pipe 451 is communicated with the pumping pipe 41, one side of the dividing plate 411 away from the inner wall of the pumping pipe 41 is inclined downward, the adjusting sleeve 452 is vertically installed at one end of the return pipe 451 away from the pumping pipe 41, a plurality of return water holes 4521 are formed in the adjusting sleeve 452 and communicated with the return pipe 451, the plurality of return water holes 4521 are formed, the plurality of return water holes 4521 are vertically spaced apart, the adjusting sleeve 452 is formed with an adjusting slide hole 4522 for slidably installing the adjusting block 453, a water outlet of the return water hole 4521 is located at a lower portion of the adjusting slide hole 4522, and limiting rings 4523 for limiting the adjusting block 453 to separate from the adjusting slide hole 4522 are disposed above and below the adjusting slide hole 4522, the adjusting block 453 is located under the adjusting slide hole 4522 by gravity and closes all of the return water holes 4521.

Referring to fig. 6 and 8, one end of the water outlet pipe 43 is communicated with a water outlet of the water pump 42, the other end of the water outlet pipe is suspended and extended, and a turbidity detection device is arranged below the water outlet pipe, the turbidity detection device comprises a weighing disc 91 and a feedback system, the recovery tank 44 is a shell with an opening at the upper side, a pulley 92 is installed above one side of the recovery tank 44, guide rods 441 are vertically extended and arranged on two side walls on the same side of the recovery tank 44, guide edges 911 are arranged on two sides of the weighing disc 91, guide holes 912 for the guide rods 441 to pass through are formed in the guide edges 911, the two guide rods 441 are correspondingly arranged in the two guide holes 912 one by one, the feedback system comprises an adjusting block 453, an adjusting rope 93 and a pulley 92, one end of the adjusting rope 93 is connected with the adjusting block 453, the other end of the adjusting rope crosses the pulley 92 and is connected with the weighing disc 91, and the adjusting block 453 is located at the uppermost side of the weighing disc 91 when the adjusting block 453 is located at the lowermost side of the adjusting slide hole 4522.

The weighing plate 91 is provided with a filtering hole 913, the filtering hole 913 is provided with a filtering membrane 914, and the filtering membrane 914 is provided with a falling hole 915.

Referring to fig. 6 and 9, a settling tank 442 is provided in the recovery tank 44, a separating diaphragm plate 445 is provided in the settling tank 442, the separating diaphragm plate 445 separates the settling tank 442 into a drainage part 4421 and a sand return part 4422, the weighing plate 91 is located in the sand return part 4422, a drainage pipe 443 communicating with the drainage part 4421 on the side away from the sand return part 4422 is provided at the lower part of the recovery tank 44, the other end of the drainage pipe 443 is located at the position away from the foundation pit or communicates with the municipal drainage system, a sand return pipe 444 communicating with the sand return part 4422 on the side away from the drainage part 4421 is further provided at the lower part of the recovery tank 44, the sand return pipe 444 is arranged in a downward inclined manner and the other end is located in the drainage well 3, the part of the bottom of the sand return part 4422 close to the drainage part 4421 is inclined downward so that the dropped silt is mainly accumulated at the position of the sand return part 4422 close to the sand return pipe 444, and water can better flow into the drainage part 4421.

The lower-lying position of the lower drainage channel 6 is also provided with a water pump for pumping water and sending the water into a city drainage system, so that rainwater in the foundation pit is discharged.

The embodiment of the application also discloses a construction method of the foundation pit drainage structure.

1) before excavation of the foundation pit, excavating an upper drainage ditch 1 and a drainage well 3;

2) a drainage channel is arranged in the drainage ditch and filled with cobblestones to form a cobblestone water filtering layer 7;

3) spirally driving an inclined strut supporting rod 8, and then completing excavation of the foundation pit;

4) after the excavation of the foundation pit is finished, the lower drainage ditch 2 is opened at the position of the bracing support rod 8 at the bottom of the foundation pit;

5) a lower drainage ditch 6 is arranged in the lower drainage ditch 2;

5.1), a support hole 63 for extending the support rod 62 is arranged on the lower drainage ditch 2;

5.2) the lower drainage ditch 2 is internally and unit-embedded with the lower drainage ditches 6, then the units for fixing the lower drainage ditches 6 are poured to form a whole, and concrete is poured into the support holes 63 to form support rods 62 fixed with the lower drainage ditches 6;

5.3) arranging geotextile layers 71 above and below the foundation pit side slope;

6) and a water suction pump assembly 4 and a turbidity detection device are arranged on the drainage well 3.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a foundation ditch drainage structures which characterized in that: the foundation pit supporting structure comprises an upper drainage ditch (1), a lower drainage ditch (2) and a drainage well (3), wherein the upper drainage ditch (1) and the drainage well (3) are arranged above a foundation pit side slope, the upper drainage ditch (1) is communicated with the drainage well (3), the lower drainage ditch (2) is arranged below the foundation pit side slope, the lower drainage ditch (2) is arranged at the bottom of the foundation pit, a lower drainage channel (6) is arranged in the lower drainage ditch (2), the lower drainage channel (6) is embedded in the lower drainage ditch (2) and supports the foundation pit side slope, and a supporting rod (62) extends from one side of the lower part of the lower drainage channel (6) far away from the foundation pit side slope to the direction far away from the foundation pit side slope;

an inclined strut supporting rod (8) is arranged between the upper drainage ditch (1) and the lower drainage ditch (2), an upper drainage channel (5) is installed in the upper drainage ditch (1), the inclined strut supporting rod (8) is inserted into a foundation pit slope, and the inclined strut supporting rod (8) is positioned between the lower part of the upper drainage channel (5) and the upper part of the lower drainage channel (6);

a plurality of flow guide supporting rods (81) are arranged outside the diagonal support supporting rod (8), the plurality of flow guide supporting rods (81) are spirally arranged along the length direction and the circumferential direction of the diagonal support supporting rod (8), and one side of each flow guide supporting rod (81) along the spiral direction is provided with a blade edge (84);

a blind pipe groove (85) is formed in one side, away from the blade edge (84), of the flow guide supporting rod (81), the bottom of the blind pipe groove (85) is an arc surface, an opening of the blind pipe groove (85) inclines towards the axis direction of the inclined strut supporting rod (8) relative to the blade edge (84), and a blind pipe (83) is installed in the blind pipe groove (85);

blind pipelines (82) are spirally arranged on the outer wall of the inclined strut supporting rod (8), the spiral direction of the blind pipelines (82) is the same as and staggered with the spiral arrangement direction of the diversion supporting rod (81), and blind pipes (83) are filled in the blind pipelines (82);

a pebble water filtering layer (7) is filled in the upper drainage channel (5), a geotechnical cloth layer (71) is laid on the pebble water filtering layer (7) and above a foundation pit side slope, a waterproof layer (72) is arranged below the geotechnical cloth layer (71), and holes are formed in the pebble water filtering layer (7) by the waterproof layer (72);

it has pump assembly (4) to settle on drainage well (3), the delivery port of pump assembly (4) is provided with turbidity detection device, turbidity detection device includes weighing dish (91) and feedback system, weighing dish (91) pass through feedback system with the flow control of pump assembly (4) is relevant, the dish of weighing (91) is gone up and has been seted up filtration pore (913), install filter membrane (914) on filtration pore (913), lower hole (915) have been seted up in filter membrane (914).

2. A foundation pit drainage structure according to claim 1, wherein: the water pumping pump assembly (4) comprises a recovery tank (44), a sedimentation tank (442) is arranged in the recovery tank (44), the weighing disc (91) is located above the sedimentation tank (442), a drain pipe (443) communicated with the bottom of the sedimentation tank (442) is arranged at the lower part of the recovery tank (44), a separation diaphragm plate (445) is arranged in the sedimentation tank (442), and the separation diaphragm plate (445) separates the sedimentation tank (442) into a drainage part (4421) and a sand return part (4422).

3. A method of constructing a drainage structure for foundation pits, for use in constructing a drainage structure for foundation pits according to any one of claims 1 to 2, comprising the steps of:

1) before excavation of the foundation pit, an upper drainage ditch (1) and a drainage well (3) are excavated;

2) a drainage ditch is arranged in the drainage ditch and filled with cobbles to form a cobble water filtering layer (7);

3) spirally driving an inclined strut supporting rod (8), and then completing excavation of the foundation pit;

4) after the excavation of the foundation pit is finished, a lower drainage ditch (2) is arranged at the position of the bracing support rod (8) at the bottom of the foundation pit;

5) a lower drainage ditch (6) is arranged in the lower drainage ditch (2);

6) and a water pumping pump assembly (4) and a turbidity detection device are arranged on the drainage well (3).

4. A method of constructing a drainage structure for a foundation pit according to claim 3, wherein: step 5) comprises the following steps:

1) a support hole (63) for extending the support rod (62) is formed in the lower drainage ditch (2);

2) lower drainage channels (6) are embedded in the lower drainage channel (2) in units, then the units for fixing the lower drainage channels (6) are poured to form a whole, and concrete is poured into the support holes (63) to form support rods (62) fixed with the lower drainage channels (6).