CN210315615U - Based on precipitation system is united to rich water foundation ditch engineering - Google Patents

Abstract

The utility model discloses a water-rich foundation pit engineering-based combined dewatering system, which consists of a water-stop curtain, a dewatering well and a base dewatering system; the waterproof curtain is arranged in a closed mode along the periphery of the foundation pit, the dewatering wells are vacuum well points and are linearly arranged along the periphery of the waterproof curtain, the base dewatering system is composed of light well points, intercepting ditches and collecting wells, the light well points are arranged in the foundation pit and are communicated with each other, the intercepting ditches are perpendicular to the pit wall, and the collecting wells 5 are arranged on the intercepting ditches at equal intervals. The beneficial effects of the utility model are that construction speed is fast, and excavation face precipitation effect is obvious.

Description

Based on precipitation system is united to rich water foundation ditch engineering

Technical Field

The utility model belongs to the technical field of geotechnical engineering foundation ditch precipitation, a combine precipitation system based on rich water foundation ditch engineering is related to.

Background

With the rapid development of economy in China, urban underground buildings and deep foundation pits of high-rise buildings are more and more widely concerned by the industry in order to meet the requirements of urban construction and development, and foundation pit precipitation is an important factor for restricting the development of the deep foundation pits of the high-rise buildings and the underground buildings. At present, the foundation pit precipitation of a common stratum is improved day by day after years of development, but a plurality of problems still remain to be solved for the foundation pit precipitation of certain complex geological conditions. For example, in a water-rich area, the foundation pit dewatering has the characteristics of large water inflow, abundant supply of surrounding water sources, low foundation bearing capacity and the like, so that the traditional single foundation pit dewatering form cannot meet the construction requirement or needs a long period, which undoubtedly increases the construction difficulty and the engineering cost.

At present, precipitation methods and corresponding advantages and disadvantages in the excavation process of foundation pits in water-rich areas are mainly classified into the following types: (1) the pipe well precipitation has the advantages of high precipitation speed, manually controllable pumping amount, low engineering cost and the like, but is mainly suitable for soil layers with higher permeability coefficients, and for soil layers with low permeability coefficients in certain water-rich areas, the expected effect of the gravity precipitation cannot be achieved, or the time period for achieving the expected effect is long, so that the construction cost is increased. (2) Electroosmosis well point dewatering attracts negatively charged soil particles through charged steel bars inserted into soil, and well point pipes attract surrounding positively charged water so as to improve dewatering effect of a soil layer with low permeability coefficient. (3) The method for spraying the well points to reduce water is similar to the light well points, but the water reducing capacity is slightly higher than that of the light well points, but the spraying well points have high requirements on construction processes, low working efficiency and strict requirement management in the operation process, are not suitable for continuous circulating excavation of a foundation pit surface, and increase the construction cost. (4) The waterproof curtain blocks water, has the characteristics of high construction speed and low construction cost, is particularly suitable for the working condition that the substrate is closer to the impervious bed, is difficult to reach the impervious bed when the permeable bed of the substrate is deeper and greatly increases the construction difficulty along with the increase of the depth.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a unite precipitation system based on rich water foundation ditch engineering, the beneficial effects of the utility model are that construction speed is fast, and excavation face precipitation effect is obvious.

The technical proposal adopted by the utility model is that the device comprises a waterproof curtain, a precipitation well and a basement precipitation system; the waterproof curtain is arranged in a closed mode along the periphery of the foundation pit, the dewatering wells are vacuum well points and are linearly arranged along the periphery of the waterproof curtain, the base dewatering system consists of light well points, intercepting ditches and water collecting wells, a plurality of light well points are arranged in the foundation pit and are mutually communicated, the intercepting ditches are perpendicular to the pit wall and are paved and the water collecting wells are arranged on the intercepting ditches at equal intervals; the waterproof curtain consists of reinforced concrete piles and plain concrete piles, wherein the reinforced concrete piles and the plain concrete piles are arranged in an equidistant and staggered occlusion manner; the dewatering well consists of a dewatering well pipe, a water pumping pipe, a filter material and clay, wherein the water pumping pipe is arranged in the dewatering well pipe, the filter material is filled outside the dewatering well pipe, the upper end of the well is sealed by the clay, and the dewatering well pipe is formed by connecting a steel pipe, a water filtering well pipe and a sand setting pipe in a combined manner from top to bottom; the light well point comprises a water collecting pipe, a well point joint, light well point well pipes and a water suction pump, wherein the water pump is connected with the water collecting pipe, the well point joint is welded at the position of a corresponding water collecting port of the water collecting pipe, the light well point well pipes are communicated with the water collecting pipe through the well point joint, the light well point well pipes are arranged at intervals of 1m, every 10 of the light well point well pipes are connected with one water collecting pipe in a group, the light well point well pipes are made of rubber, the diameter of each light well point well pipe is 25mm, a pipe body is provided with a plurality of water filtering holes, the hole diameter of each light well point well pipe is 3-4 mm, a plastic guide head is installed at the bottom end, the inner diameter of the front end of each guide head is 25mm, a cut-off trench is arranged perpendicular to the wall, the section size of the cut-off trench is 300mm multiplied by 300mm, 10 mm-50 mm of gravel is laid.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of the present invention;

FIG. 2 is a schematic cross-sectional view;

FIG. 3 is a schematic plan view of the structure;

FIG. 4 is a schematic view of a water curtain;

FIG. 5 is a schematic view of a pipe well;

FIG. 6 is a schematic illustration of a light well site;

FIG. 7 is a schematic view of a spot well;

fig. 8 is a schematic view of the guide head.

In the figure: 1. the water-stop curtain comprises a water-stop curtain, 2: a precipitation well, 3: a light well point, 4: a catch basin, 5: a water-collecting well, 6: a steel pipe, 7: a water-filtering well pipe, 8: a sand-settling pipe, 9: a water-pumping pipe, 10: a filter material, 11: clay, 12: a reinforced concrete pile, 13: a plain concrete pile, 14: a water-collecting pipe, 15: a point well joint, 16: a light well point well pipe, 17: a water-pumping pump, 18 water-filtering holes, 19: a guide head and 20: a precipitation well pipe.

Detailed Description

The present invention will be described in detail with reference to the following embodiments.

As shown in fig. 1 to 8, comprises a waterproof curtain 1, a precipitation well 2 and a base precipitation system; the waterproof curtain 1 is arranged in a closed mode along the periphery of the foundation pit, the dewatering wells 2 are vacuum well points and are linearly arranged along the periphery of the waterproof curtain 1, the base dewatering system is composed of light well points 3, intercepting ditches 4 and collecting wells 5, the light well points 3 are arranged in the foundation pit and are communicated with one another, the intercepting ditches 4 are perpendicular to the pit wall, and the collecting wells 5 are arranged on the intercepting ditches 4 at equal intervals.

The waterproof curtain 1 is composed of reinforced concrete piles 12 and plain concrete piles 13, and the reinforced concrete piles 12 and the plain concrete piles 13 are arranged in an equidistant and staggered meshing mode.

The dewatering well 2 consists of a dewatering well pipe 20, a water pumping pipe 9, a filter material 10 and clay 11, wherein the water pumping pipe 9 is placed in the dewatering well pipe 20, the filter material 10 is filled outside the dewatering well pipe 20, and the upper end of the well is sealed by the clay 11. The precipitation well pipe 20 is formed by connecting a steel pipe 6, a water filtering well pipe 7 and a sand setting pipe 8 from top to bottom.

The light well point 3 is composed of a water collecting pipe 14, a well point joint 15, a light well point well pipe 16 and a water pump 17, the water pump 17 is connected with the water collecting pipe 14, the well point joint 15 is welded on the corresponding water collecting port position of the water collecting pipe 14, and the light well point well pipe 16 is communicated with the water collecting pipe 14 through the well point joint 15. The light well point well pipes 16 are arranged at intervals of 1m, and each 10 well point well pipes are connected with one water collecting pipe 14 in a group. The light well point well pipe 16 is made of rubber, the diameter of the light well point well pipe is 25mm, the pipe body is provided with a plurality of water filtering holes 18, the aperture of the water filtering holes is 3-4 mm, a plastic guide head 19 is installed at the bottom end of the light well point well pipe, and the inner diameter of the front end of the guide head is 25 mm. The intercepting drain 4 is arranged perpendicular to the pit wall, the cross section of the intercepting drain 4 is 300mm multiplied by 300mm, and 10 mm-50 mm of broken stones are paved in the drain. The diameter of the water collecting well 5 is 600mm, and the water collecting wells are arranged along the intercepting drain 4 every 6 m. The base precipitation system is arranged along with the layered excavation of the foundation pit, and the excavation depth of each layer is 2 m.

During construction, the pipe wells 1 are linearly arranged along the periphery of the foundation pit and are 1-2 m away from the side slope line of the foundation pit; the waterproof curtain 2 is a reinforced concrete and plain concrete secant pile and is arranged along the side slope line of the foundation pit in a closed mode; the light well points are arranged on the bottom surface of the foundation pit and are arranged in a crisscross mode at equal intervals in the direction perpendicular to the pit wall; the intercepting ditch is arranged in parallel and close to the pit wall, and broken stones are paved in the ditch; the water collecting wells are arranged every 6m along the toe line.

Construction in the first stage: as shown in fig. 3, in this embodiment, after the site is leveled and paid off, the waterproof curtain 2 is constructed. Firstly, constructing a concrete guide wall, and constructing the waterproof curtain secant pile after the guide wall reaches the designed strength. The waterproof curtain 2 is formed by interlocking and meshing reinforced concrete piles 12 and plain concrete piles 13, is constructed and concreted by adopting a sleeving method at first on plain concrete pile hole sites, cuts off the intersection parts of the plain concrete piles and the reinforced concrete piles before the plain concrete piles reach initial setting, then constructs and lifts a reinforcement cage on the reinforced concrete pile hole sites by adopting the sleeving method, concretes and has the following construction sequence: plain concrete pile 13-reinforced concrete pile 12-plain concrete pile 13-reinforced concrete pile 12. The diameters of the reinforced concrete pile and the plain concrete pile are both 1000mm, and the pile center distance is 800 mm.

And (3) second-stage construction: as shown in fig. 5, after the construction of the waterproof curtain 2 is completed, the construction of the precipitation well 1 is carried out, a drilling machine is used for forming a hole at a designed position, a steel pipe 6, a water filtration well pipe 7 and a sand setting pipe 8 are connected to form a precipitation well pipe 20 and are hung in the hole, a water pumping pipe 9 is placed on the inner side of the well pipe, a filter material 10 is filled on the outer side of the well pipe, and a clay 11 is used for sealing the well on the upper portion of.

And (3) construction in a third stage: and (5) carrying out construction operation of the first section of foundation pit, wherein the excavation depth of the foundation pit is 2 m.

And a fourth stage of construction: and (3) arranging a pit bottom precipitation system, as shown in figures 3, 6, 7 and 8, firstly constructing a gravel intercepting ditch 4 and a water collecting well 5, wherein the cross section of the intercepting ditch 4 is 300mm multiplied by 300mm, gravel of 10 mm-50 mm is paved in the ditch, the diameter of the water collecting well is 500mm, and one water collecting well is arranged every 6m along the intercepting ditch. Then, a light well point 3 is arranged, the well point is formed by flushing the foundation soil by water sprayed by a water flushing pipe, the water flushing pipe is pulled out after the water flushing pipe reaches the designed depth, the water flushing pipe is rapidly inserted into a light well point well pipe 16 of the light well point, and then the light well point is formed by connecting a well point joint 15 with a water collecting pipe 14 provided with a water suction pump 17. The length of the light well point well pipe 16 is 3.5m, a water filtering hole 18 with the diameter of 3-4 mm is arranged at a position 2m away from the bottom end, and a guide head 19 is arranged at the bottom of the well pipe. And repeating the third step and the fourth step until the base reaches the designed elevation.

The utility model discloses the advantage still lies in:

first, the utility model discloses three in one unites precipitation system and carries out the regional general precipitation of foundation ditch excavation through the tube well, and the function of blocking water of foundation ditch wall to basement infiltration is realized to the stagnant water curtain, and basement precipitation system then mainly dredges the groundwater in with each grade excavation degree of depth through the light-duty well point that arranges at the basement rapidly to improve the bearing capacity of ground and make the main equipment can get into the operation of field, and compare the time limit for a project with traditional foundation ditch precipitation construction method and reduce by a wide margin.

Second, the utility model discloses but light-duty well point recycle has practiced thrift engineering cost among the trinity joint dewatering system.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and modifications of the technical entity of the present invention, which are simple to implement, are within the scope of the technical solution of the present invention.

Claims (1)

1. Based on precipitation system is united to rich water foundation ditch engineering, its characterized in that: comprises a waterproof curtain, a precipitation well and a base precipitation system; the waterproof curtain is arranged along the periphery of the foundation pit in a closed mode, the dewatering wells are vacuum well points and are linearly arranged along the periphery of the waterproof curtain, the base dewatering system consists of light well points, intercepting ditches and water collecting wells, a plurality of light well points are arranged in the foundation pit and are mutually communicated, the intercepting ditches are laid perpendicular to the pit wall, the water collecting wells are arranged on the intercepting ditches at equal intervals, the waterproof curtain consists of reinforced concrete piles and plain concrete piles, and the reinforced concrete piles and the plain concrete piles are arranged in an interlocking mode at equal intervals; the dewatering well consists of a dewatering well pipe, a water pumping pipe, a filter material and clay, wherein the water pumping pipe is arranged in the dewatering well pipe, the filter material is filled outside the dewatering well pipe, the upper end of the well is sealed by the clay, and the dewatering well pipe is formed by connecting a steel pipe, a water filtering well pipe and a sand setting pipe in a combined manner from top to bottom; the light well point comprises a water collecting pipe, a well point joint, light well point well pipes and a water suction pump, wherein the water pump is connected with the water collecting pipe, the well point joint is welded at the position of a corresponding water collecting port of the water collecting pipe, the light well point well pipes are communicated with the water collecting pipe through the well point joint, the light well point well pipes are arranged at intervals of 1m, every 10 of the light well point well pipes are connected with one water collecting pipe in a group, the light well point well pipes are made of rubber, the diameter of each light well point well pipe is 25mm, a pipe body is provided with a plurality of water filtering holes, the hole diameter of each light well point well pipe is 3-4 mm, a plastic guide head is installed at the bottom end, the inner diameter of the front end of each guide head is 25mm, a cut-off trench is arranged perpendicular to the wall, the section size of the cut-off trench is 300mm multiplied by 300mm, 10 mm-50 mm of gravel is laid.

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