阅读说明：本技术 一种新型地下水回灌结构及施工工艺 (Novel groundwater recharge structure and construction process ) 是由 孙杰 石义 孙晓辉 张胜安 乔秀兵 周平 尤楚桐 王凯龙 韩冲 于 2020-07-24 设计创作，主要内容包括：本发明属于基坑施工技术领域,具体涉及到一种新型地下水回灌结构及施工工艺,本发明采用回灌井与渗沟组合回灌方式或回灌井与拉管组合回灌方式,大大增加了回灌量,提高了回灌效率；回灌井与渗沟组合回灌方式增大了回灌接触面积,加大了回灌量,该回灌方式经济性好,效果明显、回灌量大；创新性的采用回灌井与拉管结合方式解决了同层回灌的工程难题,避免了不同含水层间相互串流污染,增大了回灌量。(The invention belongs to the technical field of foundation pit construction, and particularly relates to a novel groundwater recharge structure and a construction process, wherein a recharge well and an infiltration ditch combined recharge mode or a recharge well and a pull pipe combined recharge mode is adopted, so that the recharge quantity is greatly increased, and the recharge efficiency is improved; the recharge well and the infiltration ditch combined recharge mode increases the contact area of recharge and the recharge quantity, and the recharge mode has good economy, obvious effect and large recharge quantity; the combined mode of the recharge well and the pull pipe is innovatively adopted to solve the engineering problem of the recharge at the same layer, avoid the mutual series flow pollution between different water-containing layers and increase the recharge quantity.)

1. The utility model provides a novel groundwater recharge structure, includes a plurality of recharge well (1), its characterized in that: the recharging wells (1) are communicated with each other through seepage ditches (2) or pull pipes.

2. A novel groundwater recharge structure as claimed in claim 1, wherein: when chemical reaction does not occur between water-bearing layers below the recharging well (1), an infiltration ditch (2) is dug at the upper part of the stratum, the infiltration ditch (2) mutually communicates the upper parts of the recharging well (1), graded broken stones (4) are filled in the infiltration ditch (2), and the infiltration ditch (2) is communicated with a water filtering pipe (5) in the recharging well (1).

3. A novel groundwater recharge structure as claimed in claim 2, wherein: and a filter material (6) is filled between the water filter pipe (5) and the hole wall of the recharge well (1).

4. A novel groundwater recharge structure as claimed in claim 2, wherein: the diameter of the recharge well (1) is larger than 1.5m, and the width of the infiltration ditch (2) is equal to the diameter of the recharge well (1).

5. A novel groundwater recharge structure as claimed in claim 2, wherein: the water filtering pipe (5) in the recharge well (1) adopts a sand-free concrete pipe or a bridge type water filtering pipe.

6. A novel groundwater recharge structure as claimed in claim 1, wherein: when chemical reaction occurs between each water-bearing layer below the recharge well (1), the recharge wells (1) of the water-bearing layers (9) to be recharged are communicated through a pull pipe, the pull pipe is a water seepage blind pipe (3), graded broken stones (4) are filled in the pull pipe, the pull pipe is positioned in the water-bearing layers (9) to be recharged, steel protection cylinders (7) with densely distributed holes are adopted inside the recharge wells (1) in the water-bearing layers (9) to be recharged, the steel protection cylinders (7) are communicated with the pull pipe, and steel protection walls (8) without holes are adopted inside the recharge wells (1) above the water-bearing layers (9) to be recharged.

7. A novel groundwater recharge structure as claimed in claim 6, wherein: the aperture ratio of the steel casing (7) is not less than 50%.

8. A novel groundwater recharge structure as claimed in claim 6, wherein: the diameter of the water seepage blind pipe (3) is not more than 600 mm.

9. A novel groundwater recharge structure based on the novel groundwater recharge structure as claimed in claim 2, the novel groundwater recharge construction process is characterized in that: the method comprises the following steps:

positioning a recharging well (1);

secondly, performing rotary drilling hole forming construction on the recharge well (1);

thirdly, a water filter pipe (5) is placed in the recharge well (1), and then a filter material (6) is filled between the water filter pipe (5) and the wall of the recharge well (1);

fourthly, excavating an infiltration ditch (2) to communicate with each recharging well (1), and filling graded broken stones (4) into the infiltration ditch (2);

and (V) recharging the recharging well (1) for operation.

10. A novel groundwater recharge structure as claimed in claim 6, a novel groundwater recharge construction process, characterized in that: the method comprises the following steps:

firstly, pipe drawing construction; guiding the drill hole after determining the crossing route, drawing the water seepage blind pipe (3) to cross, enabling the water seepage blind pipe (3) to be positioned in the water-bearing layer (9) to be recharged, and backfilling and plugging the upward drill hole of the water-bearing layer (9) to be recharged by using clay (10);

(II) constructing the recharge well (1): positioning a recharging well (1), then manually excavating holes in sections of the recharging well (1) for construction, namely, when each section of recharging well (1) is excavated, putting a section of steel retaining wall (8) into the recharging well (1), sequentially constructing until the recharging well (1) is constructed to a water-bearing layer (9) to be recharged, putting a steel retaining cylinder (7) into the recharging well (1), temporarily plugging holes of the steel retaining cylinder (7) by using cement, and when the position of a water seepage blind pipe (3) is excavated, cutting off the water seepage blind pipe (3) in the recharging well (1) to enable the steel retaining cylinder (7) to be connected with the water seepage blind pipe (3) outside the recharging well (1);

thirdly, after the recharging well (1) is dug to a designed position, removing the daub at the hole of the steel casing (7);

and (IV) recharging the recharging well (1) for operation.

Technical Field

The invention belongs to the technical field of foundation pit construction, and particularly relates to a novel underground water recharging structure and a construction process.

Background

Along with the development of cities, a large amount of engineering construction pumps underground water, so that the underground water level is continuously reduced, and the contradiction between city construction and water conservation and spring conservation is increasingly prominent.

The recharge amount of groundwater is related to many factors, mainly including: formation permeability, recharge pressure, recharge contact area, etc. Currently, groundwater recharge mainly adopts a recharge well for recharge, the recharge contact area is small, the recharge amount is limited, and the phenomenon that people can not recharge occurs. Some projects adopt pressure recharging, and the recharging effect of the method is superior to that of a common recharging well, but the method is limited by small recharging contact area, limited recharging amount and higher cost. Particularly for underground water with a plurality of aquifers, in some regions, because mineral components of the aquifers can generate chemical reactions, water of different aquifers cannot be mixed with each other, and for the situation, a 'same-layer recharge' mode must be adopted, namely underground water of a certain aquifer extracted from a foundation pit curtain must be recharged to the same aquifer outside the curtain, so that the recharge amount is smaller, and the recharge efficiency is lower.

Disclosure of Invention

The invention provides a novel groundwater recharge structure and a construction process for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a novel groundwater recharge structure comprises a plurality of recharge wells which are communicated with each other through infiltration ditches or pull pipes.

When chemical reaction does not occur between water-bearing layers below the recharge well, an infiltration ditch is dug at the upper part of the stratum, the upper parts of the recharge well are mutually communicated through the infiltration ditch, graded broken stones are filled in the infiltration ditch, and the infiltration ditch is communicated with a water filter pipe in the recharge well.

Preferably, a filter material is filled between the strainer and the wall of the recharge well.

Preferably, the diameter of the recharge well is more than 1.5m, and the width of the infiltration ditch is equal to the diameter of the recharge well. Preferably, the strainer in the recharge well adopts a sand-free concrete pipe or a bridge type strainer.

When chemical reaction occurs between aquifers below the recharge wells, the recharge wells of the aquifers to be recharged are communicated through a pull pipe, the pull pipe is a water seepage blind pipe, graded broken stones are filled in the pull pipe, the pull pipe is located in the aquifers to be recharged, steel protection cylinders with densely distributed holes are adopted in the recharge wells in the aquifers to be recharged, the steel protection cylinders are communicated with the pull pipe, and steel protection walls without holes are adopted in the recharge wells above the aquifers to be recharged.

Preferably, the opening rate of the steel casing is not less than 50%.

Preferably, the diameter of the water seepage blind pipe is not more than 600 mm.

When chemical reaction does not occur between each aquifer below the recharging well, the novel groundwater recharging construction process comprises the following steps:

positioning a recharging well;

secondly, performing rotary drilling hole forming construction on the recharge well;

thirdly, placing a water filter pipe in the recharge well, and filling filter materials between the water filter pipe and the wall of the recharge well;

fourthly, excavating an infiltration ditch to communicate the recharging wells, and filling graded broken stones into the infiltration ditch;

and (V) recharging the recharging well for operation.

When chemical reaction occurs between aquifers below the recharging well, the novel groundwater recharging construction process comprises the following steps:

firstly, pipe drawing construction; guiding the drill hole after determining the crossing route, drawing the water seepage blind pipe to cross, enabling the water seepage blind pipe to be positioned in the water-containing layer to be recharged, and backfilling and plugging the hole of the drill hole upward of the water-containing layer to be recharged by clay;

(II) construction of a recharge well: positioning a recharging well, then carrying out manual hole digging construction on the recharging well in sections, wherein each section of recharging well is dug, then a section of steel retaining wall is placed in the recharging well, the construction is carried out in sequence until the recharging well is constructed to a water-bearing layer to be recharged, a steel retaining cylinder is placed in the recharging well, the hole of the steel retaining cylinder is temporarily blocked by cement, and when the position of a water seepage blind pipe is dug, the water seepage blind pipe in the recharging well is cut off, so that the steel retaining cylinder is connected with the water seepage blind pipe outside the recharging well;

thirdly, after the recharging well is dug to a designed position, removing the daub at the hole of the steel casing;

and (IV) recharging the recharging well for operation.

The invention solves the problem of small recharging amount of the recharging well, adopts a recharging well and infiltration ditch combined recharging mode or a recharging well and pull pipe combined recharging mode, greatly increases the recharging amount and improves the recharging efficiency; the recharge well and the infiltration ditch combined recharge mode increases the contact area of recharge and the recharge quantity, and the recharge mode has good economy, obvious effect and large recharge quantity; the combined mode of the recharge well and the pull pipe is innovatively adopted to solve the engineering problem of the recharge at the same layer, avoid the mutual series flow pollution between different water-containing layers and increase the recharge quantity.

Drawings

FIG. 1 is a sectional view of a refill structure used in the present invention in which chemical reactions do not occur between the respective aquifers.

FIG. 2 is a top view of a refill structure used in the present invention in which no chemical reaction occurs between the aquifers.

FIG. 3 is a schematic structural diagram of a recharge structure used in chemical reactions between various aquifers according to the present invention.

FIG. 4 is a schematic structural diagram of the steel casing of the present invention.

In the figure, 1 recharging well, 2 infiltrating ditch, 3 infiltrating blind pipe, 4-grade broken stone, 5 strainer, 6 filter material, 7 steel casing, 8 steel casing, 9 water-bearing layer to be recharged and 10 clay.

Detailed Description

The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.