CN214090013U - Anti blind ditch that floats to deep basal pit in rich water area - Google Patents

Abstract

The utility model relates to a technical field of foundation ditch and side slope construction discloses an anti blind ditch that floats to rich water area deep basal pit, including foundation ditch, geotechnological cloth, rubble and top protective layer, geotechnological cloth is laid the tank bottom and the hole wall of foundation ditch, the foundation ditch intussuseption is filled with the rubble, the top of foundation ditch is equipped with the top protective layer. The utility model lays geotextile on the bottom and the pit wall of the anti-floating blind ditch, so that the surrounding groundwater can smoothly enter the anti-floating blind ditch and has the function of reverse filtration; the anti-floating blind ditch is filled with the gravels, so that on one hand, the underground water can smoothly flow in the anti-floating blind ditch, and on the other hand, the anti-floating blind ditch has a supporting function and cannot collapse; the whole process is simple, the construction is convenient, the anti-floating effect can be effectively achieved in the deep foundation pit of the water-rich area, and the safety and stability coefficient of the building can be improved.

Description

Anti blind ditch that floats to deep basal pit in rich water area

Technical Field

The patent of the utility model relates to a technical field of foundation ditch and side slope construction particularly, relates to an anti blind ditch that floats to rich water area deep basal pit.

Background

Many projects built according to mountains are faced with pressure brought by slope stability and underground water buoyancy, as a conventional anti-floating measure, the anti-floating anchor rod is developed to the present, the process is mature, the application is wide, but for foundations with higher water heads and more rocks, the number of required anchor rods is large, the cost is high, and the construction in cities is inconvenient.

In the construction process of the Shenzhen Luhu 'two-line flower arrangement land' canopy house region transformation project, the project is built along the mountains, the side slope is in the water-rich zone, and the excavation depth of the foundation pit is deeper, so that the design requirement on the underground anti-floating water level is higher. In the construction process, how to solve the problems of the design of the anti-floating blind ditch in the construction area and the connection with the emergency drainage outlet and the construction process of the anti-floating blind ditch directly determines the effective degree of the anti-floating water level control. The adoption of reasonable anti-floating blind ditch types and specific structures and the total construction process flow of the anti-floating blind ditch are necessary means for ensuring the construction quality and safety.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anti blind ditch that floats to rich water area deep basal pit aims at solving prior art, lacks the problem of reasonable anti blind ditch type and concrete structure that floats to rich water area.

The utility model discloses a realize like this, an anti blind ditch that floats to rich water area deep basal pit, including foundation ditch, geotechnological cloth, rubble and top protective layer, geotechnological cloth is laid the tank bottom and the hole wall of foundation ditch, the foundation ditch intussuseption is filled with the rubble, the top of foundation ditch is equipped with the top protective layer.

Further, the geotextile wraps back on the top of the gravel.

Furthermore, both sides and the upper part of the broken stone in the base tank are provided with a reverse filter layer, and the reverse filter layer is composed of granules with the particle size smaller than that of the broken stone.

Further, the section of the base groove is a trapezoidal section with a wide upper part and a narrow lower part.

Further, a composite geotechnical drainage pipe is laid at the bottom of the foundation trench.

Furthermore, a plurality of flower holes are drilled in the wall of the composite geotechnical drainage pipe, and a non-woven geotechnical cloth reverse filter layer is wrapped on the wall of the composite geotechnical drainage pipe.

Further, the top protective layer comprises one or more layers of warp-knitted geotextile, a water guide grid layer, a polyethylene protective film layer, a plain concrete cushion layer and a structural bottom plate.

Furthermore, a water collecting well is arranged beside the anti-floating blind ditch, the water collecting well is connected with the anti-floating blind ditch through a sleeve, and the upper part of the sleeve is provided with a drainage emergency stop valve.

Furthermore, the part of the sleeve extending into the anti-floating blind ditch is drilled with flower holes and is wrapped with a non-woven geotextile reversed filter layer.

Further, the groove bottom gradient of the anti-floating blind groove is 0.3%.

Compared with the prior art, the anti-floating blind ditch for the deep foundation pit in the water-rich area, provided by the utility model, has the advantages that the peripheral underground water can smoothly enter the anti-floating blind ditch and play a role of reverse filtration by laying the geotextile at the ditch bottom and the pit wall of the anti-floating blind ditch; the anti-floating blind ditch is filled with the gravels, so that on one hand, the underground water can smoothly flow in the anti-floating blind ditch, and on the other hand, the anti-floating blind ditch has a supporting function and cannot collapse; the whole process is simple, the construction is convenient, the anti-floating effect can be effectively achieved in the deep foundation pit of the water-rich area, and the safety and stability coefficient of the building can be improved.

Drawings

Fig. 1 is a schematic sectional view of a main blind ditch of an anti-floating blind ditch for a deep foundation pit in a water-rich area, which is provided by the utility model;

fig. 2 is a schematic sectional view of a main blind ditch of an anti-floating blind ditch for a deep foundation pit in a water-rich area, which is provided by the utility model;

FIG. 3 is a schematic sectional view of the connection between the anti-floating blind ditch and the water collecting well for the deep foundation pit in the water-rich area provided by the utility model;

fig. 4 is the utility model provides a pair of anti blind ditch construction process flow schematic diagram that floats to rich water area deep basal pit.

Detailed Description

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

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

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

Referring to fig. 1-4, the preferred embodiment of the present invention is shown.

The utility model provides an anti blind ditch 100 that floats to deep basal pit in rich water area, includes foundation ditch, geotechnological cloth 110, rubble 120 and top protective layer 140, and geotechnological cloth 110 is laid at the tank bottom and the pot wall of foundation ditch, and the foundation ditch intussuseption is filled with rubble 120, and the top of foundation ditch is equipped with top protective layer 140.

According to the anti-floating blind ditch for the deep foundation pit in the water-rich area, the geotextile is laid on the ditch bottom and the pit wall of the anti-floating blind ditch, so that the peripheral underground water can smoothly enter the anti-floating blind ditch and play a role in reverse filtration; the anti-floating blind ditch is filled with the gravels, so that on one hand, the underground water can smoothly flow in the anti-floating blind ditch, and on the other hand, the anti-floating blind ditch has a supporting function and cannot collapse; the whole process is simple, the construction is convenient, the anti-floating effect can be effectively achieved in the deep foundation pit of the water-rich area, and the safety and stability coefficient of the building can be improved.

For the project of transformation of the canopy region of the two-line flower arrangement land in the Luhu region of Shenzhen city, the anti-floating blind ditch 100 is designed for the construction site of the kapok ridge chip region 01-04 in the Luhu region and the deep foundation pit in the water-rich region.

The utility model provides an anti blind ditch 100 that floats to deep basal pit in rich water area, includes base groove, geotechnological cloth 110, rubble 120 and top protective layer 140, the cross-section of base groove is the trapezoidal cross-section of narrow down wide, and geotechnological cloth 110 lays at the tank bottom of base groove and pot wall to reserve the geotechnological cloth 110 that has certain width when laying, after filling in the base groove and being full of rubble 120, the geotechnological cloth 110 of certain width that reserves wraps the top of rubble 120 back, covers the top of rubble 120 completely.

A top protective layer 140 is also arranged above the foundation trench, and the top protective layer comprises one or more layers of warp-knitted geotextile, a water guide grid layer, a polyethylene protective film layer, a plain concrete cushion layer and a structural bottom plate.

In the construction work of the anti-floating blind ditch 100, the two sides and the upper part of the gravel 120 in the foundation trench are provided with the reverse filter layer, and the reverse filter layer is composed of granules with the grain diameter smaller than 120 gravel.

Two composite geotechnical drainage pipes 130 with the outer diameter of 0.3 m are distributed at the bottom of the anti-floating blind ditch 100, a plurality of flower holes are drilled on the pipe wall of each composite geotechnical drainage pipe 130, and a non-woven geotechnical cloth reverse filter layer is wrapped outside the composite geotechnical drainage pipes.

In a project for improving a canopy region of a Roche second-line flower arrangement land in Shenzhen City, aiming at a construction site 01-04 of a kapok ridge region in the Roche region, an anti-floating blind ditch 100 is designed.

The anti-floating blind ditch 100 is divided into a main blind ditch and a secondary blind ditch.

As shown in fig. 1, the main blind ditch has a trapezoidal section with a wide upper part and a narrow lower part, the upper bottom edge is 1000 mm, the lower bottom edge is 800 mm, the height of the trapezoidal section is 1500 mm, the total length of the main blind ditch is 796 m, and the gradient of the ditch bottom is 0.3%. Two composite geotechnical drainage pipes 130 with the outer diameter of 0.3 m are arranged at the bottom of the main blind ditch side by side, and a non-woven geotechnical cloth inverted filter layer is wrapped outside the composite geotechnical drainage pipes 130.

As shown in fig. 2, the cross section of the secondary blind ditch is a trapezoidal cross section with a wide upper part and a narrow lower part, the upper bottom edge is 1200 mm, the lower bottom edge is 900 mm, the height of the trapezoidal cross section is 1200 mm, the total length of the secondary blind ditch is 796 m, and the slope of the ditch bottom is 0.3%. The bottom of the secondary blind ditch is provided with a composite geotechnical drainage pipe 130 with the outer diameter of 0.3 m, and the composite geotechnical drainage pipe 130 is externally wrapped with a non-woven geotechnical cloth inverted filter layer.

As for the connection and emergency drainage of the anti-floating blind ditch 100 in the parcel, as shown in fig. 3, a water collecting well 200 is arranged beside the anti-floating blind ditch 100, the water collecting well 200 is connected with the nearest anti-floating blind ditch 100 through a sleeve 300, the distance between the sleeve 300 and the bottom of the water collecting well 200 is 300 mm, a drainage emergency stop valve 301 is connected to the upper part of the sleeve 300, the water level in the anti-floating blind ditch 100 is prevented from exceeding the designed water level under special conditions such as rainstorm, a bottom plate drainage ditch 400 is arranged on the basement bottom plate 150, the other side of the water collecting well 200 is connected with the bottom plate drainage ditch 400, and the height of the drainage emergency stop valve 301 from the bottom plate drainage ditch 400 is 300 mm.

When the underground water level in the anti-floating blind ditch 100 is abnormal or approaches to the warning value, the drainage emergency stop valve 301 on the sleeve 300 is opened, the underground water in the anti-floating blind ditch 100 is drained from the sleeve 300 under the action of water pressure, flows to the bottom plate drainage ditch 400 and is drained to the water collecting well 200, and the design can ensure that the anti-floating blind ditch 100 in the plot can effectively control the anti-floating water level. The ground water in the water collection well 200 may be pumped away by a water pump or may be drawn away by a drainage ditch or may be used for irrigation purposes, etc.

The sleeve 300 is also provided with a water pressure gauge and an automatic alarm device, the water pressure gauge can measure the water pressure condition in the sleeve 300, a user can directly read water pressure data from the water pressure gauge, the water pressure gauge is connected with the automatic alarm device, and when the water pressure exceeds a warning value, the automatic alarm device sends out an alarm signal, for example, a buzzer is started to send out a buzzing sound, so that monitoring personnel can be prompted to perform corresponding treatment in time. Or the water pressure data can be uploaded to a remote monitoring center, the water pressure data is monitored in real time, when the water pressure exceeds a warning value, an alarm is given out, for example, an alarm window is popped up, a buzzer is given out, and the like, so that monitoring personnel are prompted to control the drainage emergency stop valve 301 through remote control or on site, and the underground water in the anti-floating blind ditch 100 is drained to the water collecting well 200 in time.

A water pipe joint 302 is arranged above the sleeve 300 and can be connected with a water pipe externally and used for backwashing the anti-floating blind ditch 100 so as to avoid the blockage of the anti-floating blind ditch 100.

The sleeve 300 can be an HDPE pipe with the diameter phi of 50mm, the length of the sleeve 300 extending into the anti-floating blind ditch 100 is more than 0.5 m, a plurality of flower holes are drilled on the pipe wall of the part of the sleeve 300 extending into the anti-floating blind ditch 100, and the outer side of the pipe wall is wrapped with needle-punched geotextile, so that broken stones, impurities and the like are prevented from entering the sleeve 300 to cause blockage.

The anti-floating blind ditch construction process flow for the deep foundation pit in the water-rich area is as follows:

before the construction of the anti-floating blind ditch 100, the processes of measurement lofting, foundation trench excavation, manual groove leveling and groove acceptance inspection are required.

And (4) measuring and lofting, wherein lofting is the most applied measuring program in engineering construction. The method plays a core role in construction, and all projects cannot be constructed normally if no lofting is available. Therefore, the lofting program plays a very important role in engineering construction.

And (3) carrying out construction measurement and setting-out by a measurer at a construction site, respectively setting out excavation side lines of a drainage ditch on the ground, additionally arranging a construction plane and a high-program control pile, calculating the grooving width and depth according to the groove design of the anti-floating blind ditch 100 and the soil condition of the construction site, and determining the hole position and the lead hole depth of the grouting pipe in the fractured rock area.

In the construction process of the foundation trench excavation, the foundation trench is excavated from the downstream to the upstream, so that the foundation trench is prevented from being soaked by rainwater after the excavation in rainy days, and rainwater at the downstream of the foundation trench can be guided away by the drainage ditch in time. After the excavated broken stones are screened to be qualified, carrying out crushing processing in a construction site, and using the broken stones as the composition graded broken stones 120 of the anti-floating blind ditch 100 for filling the anti-floating blind ditch 100; the unqualified remaining crushed stones are screened and transported outside, and the crushed stones can be used for road repairing, sea filling and the like.

After the foundation trench is excavated, the trench needs to be leveled, and monitoring personnel check and accept whether the completion quality of the foundation trench meets the design requirements.

S02: the needle-punched geotextile 110 is laid in the anti-floating blind ditch 100: removing sundries and sharp stones on the bottom of the anti-floating blind ditch 100 and the wall of the pit to keep the bottom of the anti-floating blind ditch 100 and the wall of the pit flat, laying geotextile 110 on the bottom of the anti-floating blind ditch 100 and the wall of the pit to ensure that two sides of the geotextile 110 are tightly adhered to the side wall and the wall of the pit to be laid, and folding the middle of the geotextile to be 200 cm in length; the top of the anti-floating blind ditch 100 is reserved with geotextile 110 with a certain width for wrapping the gravel 120 filler. The needle-punched geotextile 110 is fixed at the top of the anti-floating blind ditch 100 by nails and the like, and a plastic gasket with the diameter of 50mm and an iron sheet with the diameter of 10mm are additionally padded, so that the geotextile 110 is prevented from moving in a dislocation way during the backfill construction and sedimentation of the upper filler.

Before the needled geotextile 110 is laid, the relevant technicians are required to detect the needled geotextile 110, and qualified products can be laid to ensure the engineering quality.

The needle-punched geotextile 110 is used as a reverse filter layer, should be laid in place at the bottom and two side walls of the anti-floating blind ditch 100, and a geotextile 110 with a certain width is reserved for covering the top of the anti-floating blind ditch 100. In the laying process of the geotextile 110, the geotextile 110 is straightened smoothly and is tightly attached to the lower cushion layer, all longitudinal or transverse lap joints of the geotextile 110 are staggered alternately, the lap joint length is not less than 30 cm, and the lap joint of the geotextile 110 is prevented from being staggered so as to ensure the filtering effect.

S03: filling the anti-floating blind ditch 100: before filling, coarse-grained macadam 120 is screened and cleaned, then the anti-floating blind ditch 100 is filled with the coarse-grained macadam 120, two sides and the upper part of the coarse-grained macadam 120 are layered according to a certain proportion, and fine-grained granules are laid as a reverse filter layer until the anti-floating blind ditch 100 is filled fully. The reverse filtering layer is made of 2-4 layers of sand, gravel or pebble with different particle sizes, the particles are gradually increased along the direction of water flow, and the particles of any layer are not allowed to pass through the gaps of the adjacent thicker layer. When the inverted filter layer is laid and buried, a flat vibrator is adopted for tamping, and the methods of rolling, tamping and the like cannot be adopted for cutting so as to avoid influencing the water supply effect. The filter material is hard, non-efflorescence, non-hydrolysis, clay particle with particle size less than 0.1mm, and particle content less than or equal to 3%. The anti-seepage material is paved on the top of the anti-floating blind ditch 100, and cement slurry is strictly prevented from seeping into the anti-floating blind ditch 100 in the paving process of the plain concrete cushion layer, so that the drainage and anti-floating functions of the anti-floating blind ditch are influenced.

Before filling the crushed stones 120, the related technicians are required to detect the particle size, the cleanliness and the like of the crushed stones 120, and the crushed stones 120 qualified by detection and meeting the technical requirements can be filled into the anti-floating blind ditch 100 so as to ensure the engineering quality.

Before filling the broken stones 120, after the geotextiles 110 are laid, a composite geotextile drain pipe 130 with the outer diameter of 300 mm is laid at the bottom of the anti-floating blind ditch 100. According to the water quantity of the water-rich area and the anti-floating design requirement, 1, 2 or a plurality of composite geotechnical drainage pipes 130 can be laid at the bottom of the anti-floating blind ditch 100, so that the water in the anti-floating blind ditch 100 can be drained more easily. The composite geotechnical drain pipe 130 in the anti-floating blind ditch 100 is an HDPE pipe, a plurality of flower holes are drilled on the pipe wall of the composite geotechnical drain pipe 130, the aperture of each flower hole is 10mm, the space interval between the flower holes is 50mm, and a double layer 250g/m is wrapped outside the pipe body of the composite geotechnical drain pipe 130²The reverse filtration geotextile. The water in the anti-floating blind ditch 100 can smoothly enter the composite geotechnical drainage pipe 130 through the anti-filtering geotechnical cloth and the flower holes on the pipe wall, and the water in the composite geotechnical drainage pipe 130 can be more easily drained by a water pump, a drainage ditch and the like.

After the filling of the crushed stones of the anti-floating blind ditch 100 and the laying of the composite geotechnical drainage pipe 130 are completed, the hidden inspection and acceptance of the engineering quality are carried out by related technicians, and the hidden danger caused by the incapability of rechecking is prevented.

S04: and wrapping the crushed stones 120 back by the geotextile 110 with a certain width reserved at the top of the anti-floating blind ditch 100, so that the top of the anti-floating blind ditch 100 is completely covered by the geotextile 110. The geotextiles 110 on the two sides of the top of the anti-floating blind ditch 100 are overlapped together at the top of the blind ditch, and the length of the overlapped part is more than 30 cm, so that the filtering effect is ensured.

After the geotextile is wrapped and crushed, the floating blind ditch is integrally subjected to quality inspection and acceptance by related technicians, and after the inspection and acceptance are qualified, the top protective layer can be laid so as to avoid the reworking phenomenon that the top protective layer is broken due to the problem of the quality of the floating blind ditch.

S05: a top protective layer 140 is laid. The top protective layer 140 may be one or more of a water-conducting mesh layer, a polyethylene protective film, a plain concrete cushion layer, a structural floor. At the top of the anti-floating blind ditch 100, a water guiding grid layer is laid above the needle-punched geotextile 110, or after a warp-knitted geotextile is laid above the needle-punched geotextile 110, a water guiding grid layer is laid.

The water guide grid layers are combined in a sealing or lapping mode, the connecting positions are bound by metal bands or binding bands, and the binding distance is 2000 mm. The filtering membrane of the water guide grid layer plays a role in filtering sand and gravel and prevents the sand and gravel from damaging the polyethylene protective film above the filtering membrane.

And a polyethylene film protective layer with the thickness of 0.06 mm is laid above the water guide grid layer, and the polyethylene film protective layer is well fixed by combining an overlapping mode and nails.

Pour plain concrete bed course in the top of polyethylene film protective layer, plain concrete bed course is the structure of making by the concrete of no muscle or configuration atress reinforcing bar, plain concrete bed course effect: the water-proof, drainage and antifreezing agent can improve the working conditions of the base layer and the soil foundation, has better water stability requirement, and reduces the erosion of underground water and the like to the reinforced concrete of the base.

And a structural bottom plate of the building is laid or poured above the plain concrete cushion layer.

In the construction process of the anti-floating blind ditch 100, the periphery protection of the finished blind ditch needs to be made until the pouring of the plain concrete cushion layer is completed.

The anti-floating blind ditch 100 which has been constructed should be well protected, and especially at the zone boundary of the construction subareas and the intersection position of the primary and secondary blind ditches, safety warning signs and guard rails can be arranged if necessary.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The anti-floating blind ditch is characterized by comprising a foundation trench, geotextile, broken stones and a top protective layer, wherein the geotextile is laid at the bottom and the wall of the foundation trench, the broken stones are filled in the foundation trench, and the top protective layer is arranged at the top of the foundation trench.

2. The anti-floating blind ditch for the deep foundation pit in the water-rich area as claimed in claim 1, wherein the geotextile is wrapped back on the top of the broken stones.

3. The anti-floating blind ditch for the deep foundation ditch in the water-rich area of claim 2, wherein the crushed stones in the foundation ditch are provided with the reverse filter layers on both sides and the upper part, and the reverse filter layers are composed of granules with smaller grain sizes than the crushed stones.

4. The anti-floating blind ditch for the deep foundation ditch in the water-rich area as claimed in claim 2, wherein the cross section of the foundation ditch is a trapezoidal cross section with a wide top and a narrow bottom.

5. The anti-floating blind ditch for the deep foundation pit in the water-rich area as claimed in claim 2, wherein a composite earth drain pipe is laid at the bottom of the foundation ditch.

6. The anti-floating blind ditch for the deep foundation pit in the water-rich area as claimed in claim 5, wherein the composite geotechnical drainage pipe is drilled with a plurality of holes on the pipe wall and wrapped with a non-woven geotextile filter layer.

7. The anti-floating blind ditch for the deep foundation pit in the water-rich area according to claim 2, wherein the top protective layer comprises one or more of a warp-knitted geotextile, a water-guiding mesh layer, a polyethylene protective film layer, a plain concrete cushion layer and a structural bottom plate.

8. The anti-floating blind ditch for the deep foundation pit in the water-rich area according to any one of claims 1-7, wherein a water collecting well is arranged beside the anti-floating blind ditch, the water collecting well is connected with the anti-floating blind ditch through a casing pipe, and the upper part of the casing pipe is provided with a drainage emergency stop valve.

9. The anti-floating blind ditch for the deep foundation pit in the water-rich area as claimed in claim 8, wherein the part of the sleeve extending into the anti-floating blind ditch is drilled with flower holes and wrapped with a non-woven geotextile reversed filter layer.

10. The anti-floating blind ditch for the deep foundation pit in the water-rich area according to any one of claims 1 to 7, wherein the ditch bottom gradient of the anti-floating blind ditch is 0.3%.

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