CN115323862A

CN115323862A - Drainage construction process for slope tops around anti-infiltration foundation pit

Info

Publication number: CN115323862A
Application number: CN202211016156.XA
Authority: CN
Inventors: 汪程锦
Original assignee: China MCC17 Group Co Ltd
Current assignee: China MCC17 Group Co Ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2022-11-11

Abstract

The invention discloses a drainage construction process for a slope top around a downward-seepage-preventing foundation pit, belonging to the field of slope support construction, and comprising the steps of setting a concrete temporary road according to an annular foundation pit excavation layout according to a total plane excavation layout, setting an exposed corrugated pipe intercepting ditch on the inner side of the road, wherein the distance between the intercepting ditch and a slope top edge line is 1m, trimming the ground surface around the foundation pit, and enabling a slope top corner to be towards a drainage slope of 5% -10% of the intercepting ditch; arranging the periphery of the foundation pit according to the requirement by well point dewatering; and water collecting wells and water discharging pipes are arranged on the road every 30-50m, exposed corrugated pipe drainage ditches are arranged on the outer side of the road, and the road is filtered and discharged to a municipal pipe network. Effectively guarantee that surface water in time discharges, not to the interior or secret infiltration of foundation ditch, reduce domatic rainwash, can effectively guarantee stability, the security of foundation ditch, ensure foundation ditch safety, and can effectively control sinking of interim road subgrade.

Description

Drainage construction process for slope tops around anti-infiltration foundation pit

Technical Field

The invention belongs to the field of slope support construction, and particularly relates to a drainage construction process for a slope top at the periphery of a downward-osmosis-preventing foundation pit.

Background

At present, in high-rise buildings, residential projects including groups, large underground garages, shopping malls and the like all relate to excavation construction of deep foundation pits, firstly, the support safety of side slopes is considered for the construction of the deep foundation pits, the existing side slope support construction method mainly comprises a series of forms such as gravity retaining walls, buttress retaining walls, cantilever type supports, anchor retaining wall supports, row piles, anchor spraying supports, large slopes and the like, and various support forms are different for different excavation depths of the foundation pits, peripheral geological environments, construction environments and the like. When a designer or a constructor carries out side slope support design or construction, the specific structure of a side slope soil layer is not subjected to specific quantitative analysis, and construction is carried out only by adopting a general side slope support scheme design; particularly, the seepage at the periphery of the foundation pit does not consider the key structure of the whole slope support control system, meanwhile, the consideration is not good or the control is not in place during construction, when an emergency or continuous rainy season occurs, the accumulated water at the top of the slope at the periphery of the foundation pit cannot be discharged in time, the infiltration is formed, and the safety accident of the instability of the slope is easily caused.

The conventional treatment of the periphery of a foundation pit, namely the position of a slope top, is mostly temporary road and brick drainage ditches, the slope top is only carried along by guniting, and the defects that the water seepage of the guniting is large, the water seepage due to the fracture of the brick drainage ditches in the using process and the overall water intercepting and draining effect are not considered exist.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provided is a method.

In order to solve the technical problems, the inventor obtains the technical scheme of the invention through practice and summary, and the invention discloses a construction process for intercepting and draining water on a slope top at the periphery of an anti-infiltration foundation pit. According to a general plane excavation layout, a concrete temporary road is arranged according to an annular foundation pit, an exposed corrugated pipe intercepting ditch is arranged on the inner side of the road, the intercepting ditch is 1m away from the edge line of a slope top, the ground surface around the foundation pit is trimmed, the slope top is turned to the drainage slope a% of the intercepting ditch, and the a% is 5% -10%; arranging the periphery of the foundation pit according to the requirement by well point dewatering; and water collecting wells and water discharging pipes are arranged on the road every 30-50m, exposed corrugated pipe drainage ditches are arranged on the outer side of the road, and the road is filtered and discharged to a municipal pipe network. Effectively guarantee that surface water in time discharges, not to the interior or secret infiltration of foundation ditch, reduce domatic rainwash, can effectively guarantee stability, the security of foundation ditch, ensure foundation ditch safety, and can effectively control sinking of interim road subgrade.

The specific implementation steps are as follows:

step one, according to a general plane excavation layout, arranging a concrete temporary road according to an annular foundation pit, arranging an outward drainage gradient b on the pavement of the concrete temporary road, wherein b can be 2-5%, arranging water collecting wells at the two sides of the road every 30-50m of a hardened road, connecting drainage pipes of 100-200mm in a hidden mode through the water collecting wells, and setting a drainage height difference of 5-10cm for the drainage pipes;

step two, arranging an exposed bellows intercepting ditch at the inner side of the road, arranging a water collecting well in a slope direction, wherein the distance between the intercepting ditch and a slope top edge line is 1m, finishing the ground surface around a foundation pit, and hardening the concrete of a drainage slope with the slope top corner of 10% towards the intercepting ditch;

and step three, arranging an exposed corrugated pipe drainage ditch and a slope water collecting well on the outer side of the road, filtering and then discharging to a municipal pipe network.

In some embodiments, the drain is a feed water bypass.

In some embodiments, the drain pipe communicates between the bellows intercepting drain and the bellows drain.

Compared with the prior art, the invention can obtain the following technical effects:

according to a general plane excavation layout, a concrete temporary road is arranged according to an annular foundation pit, an exposed corrugated pipe intercepting ditch is arranged on the inner side of the road, for example, the intercepting ditch is 1m away from a slope top edge line, the ground surface around the foundation pit is trimmed, and the slope top corner faces to a% of drainage gradient of the intercepting ditch; well point dewatering is arranged on the periphery of the foundation pit according to requirements; and water collecting wells and water draining pipes are arranged on the road every 30 meters, corrugated pipe drainage ditches are arranged on the outer side of the road in an exposed mode, and the road is filtered and then drained to a municipal pipe network. The method has the advantages that the surface water is effectively guaranteed to be discharged in time, the surface water does not permeate into the foundation pit or underground, the slope surface rain wash is reduced, the stability and the safety of the foundation pit can be effectively guaranteed, the safety of the foundation pit is guaranteed, and the sinking of the temporary road subgrade can be effectively controlled; the exposed corrugated pipe can timely and effectively clean sludge garbage and can ensure that rainwater cannot seep downwards, and can be repaired in the first time even if damaged, so that surface water is effectively discharged in time, underground water is prevented from seeping downwards, and the slope rainwater erosion is reduced.

Drawings

In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a construction process for intercepting drainage water at the top of a slope around an anti-infiltration foundation pit.

In the figure: 1-corrugated pipe intercepting drain; 2-concrete temporary roads; 3, a water collecting well; 4-a drain pipe; 5-top corner of the slope; 6-corrugated pipe drainage ditch.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following 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 application of the principles of the present invention will be further described with reference to the accompanying drawings and specific embodiments.

Examples

As shown in fig. 1: a drainage construction process for a slope top around a downward-seepage-preventing foundation pit comprises the following steps:

step one, configuring a concrete temporary road 2 according to a total plane excavation layout drawing, wherein the road surface of the concrete temporary road 2 comprises an outward drainage gradient of 2% -5%, water collecting wells 3 are arranged on two sides of the road every 30-50m of a hardened road, drainage pipes 4 of 100-200mm are hidden in the water collecting wells, and a drainage height difference of 5-10cm is set for the drainage pipes 4;

step two, arranging an exposed bellows intercepting drain 1 on the inner side of the road, arranging a slope-direction water collecting well, enabling the bellows intercepting drain 1 to be 1m away from a slope top corner 5 and a slope hardening edge line, finishing the ground surface around the foundation pit, and hardening the concrete on the drainage slope of 5% -10% of the slope top corner 5 to the bellows intercepting drain;

and step three, arranging an exposed corrugated pipe drainage ditch 6 and a slope water collecting well on the outer side of the road, filtering and then discharging to a municipal pipe network.

The drain pipe is a water supply channel pipe, and the drain pipe 4 is communicated with the corrugated pipe intercepting ditch 1 and the corrugated pipe drainage ditch 6.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

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

Claims

1. A drainage construction process is cut at the peripheral slope top of a downward-seepage-preventing foundation pit, and is characterized in that: the method comprises the following steps:

step one, according to a general plane excavation layout, configuring a concrete temporary road according to an annular foundation pit, wherein the pavement of the concrete temporary road comprises an outward b% drainage gradient, water collecting wells are arranged on two sides of the road every 30-50m of a hardened road, drainage pipes of 100-200mm are hidden in the water collecting wells, and a drainage height difference of 5-10cm is set for the drainage pipes;

step two, arranging an exposed bellows intercepting ditch and a slope-direction water collecting well on the inner side of the road, wherein the distance between the bellows intercepting ditch and a slope hardening edge line of a slope top corner zone is 1m, finishing the ground surface around the foundation pit, and a% drainage slope of the slope top corner-direction bellows intercepting ditch and hardening concrete;

2. The construction process for intercepting and draining water at the slope top around the downward osmosis preventing foundation pit according to claim 1, is characterized in that: the concrete with the top corner hardened to the water drainage slope of the corrugated pipe intercepting ditch in a percent is hardened, and the a percent is 5 to 10 percent.

3. The construction process for intercepting and draining water at the slope top around the downward osmosis preventing foundation pit according to claim 1, is characterized in that: the concrete temporary road surface comprises b% of outward drainage slope, and the b% is 2% -5%.

4. The construction process for intercepting and draining water at the slope top around the downward osmosis preventing foundation pit according to claim 1, is characterized in that: the drain pipe is a water supply pipeline.

5. The construction process for intercepting and draining water at the slope top around the downward osmosis preventing foundation pit according to claim 1, is characterized in that: the drain pipe is communicated with the corrugated pipe intercepting ditch and the corrugated pipe drainage ditch.