WO2015032186A1 - 潜层式农田丰产永久性排水沟 - Google Patents

潜层式农田丰产永久性排水沟 Download PDF

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Publication number
WO2015032186A1
WO2015032186A1 PCT/CN2014/071798 CN2014071798W WO2015032186A1 WO 2015032186 A1 WO2015032186 A1 WO 2015032186A1 CN 2014071798 W CN2014071798 W CN 2014071798W WO 2015032186 A1 WO2015032186 A1 WO 2015032186A1
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Prior art keywords
layer
ditch
filter layer
submerged
yield
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PCT/CN2014/071798
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English (en)
French (fr)
Inventor
韩秋华
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Han Qiuhua
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Publication of WO2015032186A1 publication Critical patent/WO2015032186A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B11/00—Drainage of soil, e.g. for agricultural purposes

Definitions

  • the invention relates to an agricultural production water supply and drainage regulation system, and more particularly to a permanent drainage ditch with a latent layer farmland.
  • the object of the present invention is to provide a permanent drainage ditch with a long-lasting drainage capacity, which can solve the problem of smooth water flow, high-efficiency reduction of ground and groundwater level, convenient construction, time saving, and durability.
  • the present invention provides the following technical solutions:
  • a latent layer farmland high-yield permanent drainage ditch comprising, in order from top to bottom, an isolation layer, a first filtration layer, a second filtration layer, a third filtration layer, the separation layer being composed of straw or straw,
  • the first filter layer is composed of pebbles
  • the second filter layer is composed of pebbles or medium stones
  • the third filter layer is composed of boulder
  • the separation layer is covered with a soil tillage layer
  • a bracket is disposed between the three filter layers and the bottom of the groove, and a water flow channel for water flow is formed between the bracket and the bottom of the groove, and the bracket is provided with a plurality of flowing water gaps or holes.
  • the bracket is composed of two pieces of nine-five bricks which are cut off at a relative position by a corner, and the slits are butted, placed at the bottom of the groove and formed into a triangular cavity with the bottom, and the nine-five brick group and the group are placed side by side.
  • the surface layer of the bracket Description
  • the thickness of the isolation layer is 50-80 mm
  • the thickness of the first filter layer is 100-180 mm
  • the thickness of the second filter layer is 100-180 mm
  • the thickness of the third filter layer is 100-180 mm
  • the thickness of the fourth filter layer is 90-180mm.
  • the drainage channels are arranged in a crisscrossing manner and communicate with each other.
  • the width of the drainage channels is 250 mm
  • the distance between the main longitudinal drainage channels is 40 to 100 meters
  • the distance between the lateral grooves is 40 to 80 meters.
  • the drainage ditch is provided with a water outlet and a water inlet at a joint with the canal, the estuary and each of the fields, and the drainage ditch in the adjacent field is connected by the respective water outlet and the water inlet o
  • the cross-sectional shape of the flow channel is arched.
  • the gap width of the bracket is smaller than the diameter of the stone of the third filter layer.
  • the filter layer is from small to large in the upper layer to the lower layer, and the stone of the filter layer can be dismantled in the old wall, broken brick and demolished stone block broken in the urbanization construction, and the large stone is Medium and small screening selection, turning waste into treasure.
  • the bracket is composed of a plurality of porous bricks arranged in the direction of the drainage channel, and a gap is left between the porous bricks, wherein the porous brick has a plurality of straight through holes, and the through holes are longitudinally drained along the drainage direction. The through hole and the gap are connected to each other in the groove direction.
  • the porous brick is formed by two or more layers, and the through hole is a through hole; the gap includes a longitudinal gap and a lateral gap between the porous bricks, and the longitudinal gap is larger than the lateral gap is smaller than the third The boulder size of the filter layer.
  • the perforated brick has two through holes, and the front and rear end faces of the perforated brick are respectively a straight surface and a sloped surface, and the inclined surface faces upward, and an end surface between the end-to-end porous bricks forms an upward opening gap and is connected.
  • the through hole forms the flow channel, and the space
  • the book gap is smaller than the size of the boulder of the third filter layer; or the front and rear end faces of the perforated brick are beveled surfaces.
  • the perforated brick is a cement precast.
  • FIG. 1 is a schematic view showing the structure of a permanent drainage ditch of a submerged layer farmland according to the present invention.
  • Fig. 2 is a cross-sectional view taken along line AA of Fig. 1; Instruction manual
  • Figure 3 is a schematic cross-sectional view of another embodiment of the present invention.
  • Figure 4 is a schematic cross-sectional view of Figure 3.
  • Figure 5 is a perspective view of another embodiment of the present invention.
  • Figure 6 is a schematic cross-sectional view of Figure 5.
  • isolation layer 2 first filter layer 3 - second filter layer 4 - third filter layer 5 - support 6 - soil tillage layer 7 - perforated brick 71 - straight through hole 72 - longitudinal gap, 711- Front end face, 712-rear end face.
  • the present invention discloses a latent-type farmland high-yield permanent drainage ditch, comprising an isolation layer 1, a first filtration layer 2, a second filtration layer 3, and a third filtration layer 4,
  • the separating layer 1 is composed of straw or straw and has a thickness of 50-80 mm.
  • the layer mainly serves as a filtering barrier against sediment and impurities.
  • the first filtering layer 2 is composed of pebbles or large pieces of seeds, thickness.
  • the first filter layer 3 is composed of a medium stone or a one-inch stone having a thickness of 100-180 mm
  • the third filter layer 4 is composed of a pebbles or a large stone or a goose-sized stone.
  • the thickness is 100-180mm.
  • the thickness of the isolation layer and the filter layer can also be adjusted according to local conditions, scientifically and flexibly.
  • the large, medium and small stones are relatively comparatively compared between the filter layers, and the size of the filter layer increases from top to bottom, and the size of the stones is 0.5-2 times different.
  • the lowest purpose of the lowest stone makes the water flow smoother.
  • a bracket 5 is disposed between the third filter layer 4 and the bottom of the groove, and the bracket 5 is provided with a plurality of vertically flowing water gaps or holes, the gap width is smaller than the diameter of the boulder, and the bracket 5 and the bottom of the groove Forming an empty space for water to flow Description
  • the bracket 5 may be composed of two pieces of nine-five bricks which are cut at a relative position by a corner, and the slits are butted, placed at the bottom of the groove and formed into a triangular cavity with the bottom of the groove, and the nine-five brick group is juxtaposed with the group. Placement, forming a flow channel with a triangular cross section with the bottom of the groove, the upper surface of the bracket 5 is covered by the boulder of the third filter layer, and a gap smaller than the diameter of the large stone is left between the group of the five-five bricks and the group.
  • the bracket 5 may also be composed of a plurality of porous bricks 7 arranged in the direction of the drainage channel.
  • the porous bricks are formed by two or more layers, and a gap is left between the porous bricks 7.
  • the gap includes a longitudinal gap 72 between the brick and the brick and a lateral gap between the upper and lower bricks.
  • the porous brick 7 has a plurality of straight through holes 71 therein, and the through hole 71 has a length along the drainage ditch. In the direction, each of the gaps communicates with the through hole 71 and communicates with the upper filter layer.
  • the gap 72 communicates with the through hole 71, communicates with the upper filter layer, and naturally forms a bottom flow channel.
  • the water flow is discharged from the third filter layer 4, and is quickly discharged from the gap between the brick 7 and the brick and the bottom flow channel formed by the through hole.
  • the porous bricks are simply stacked together without a seam to ensure a gap between the brick and the brick.
  • FIG. 5 and 6 another embodiment of the present invention is a porous brick.
  • the through holes of the porous brick 7 are two, and the front end surface 711 and the rear end surface 712 of the porous brick 7 are respectively
  • the inclined surface and the straight surface, the inclined surface faces upward, and the two end faces between the end-to-end porous bricks form an upward opening gap and communicate with the hole 71 of the porous brick, so that the water flows from the third filter layer 4 and then from the brick 7
  • the gap between the bricks 7 and the bottom layer of the through-holes 71 is quickly discharged, and the gap is smaller than the size of the boulder of the third filter layer to prevent the stones from leaking.
  • the porous bricks are only stacked and stacked together without seams to ensure a gap between the bricks and the bricks.
  • the front and rear end faces of the porous brick may be beveled, The description of the book makes the gap between the brick and the brick larger, but the gap size is such that the stone of the previous filter layer is not leaked.
  • the porous brick may be a cement preform.
  • the bracket 5 may be made of other corrosion-resistant and recyclable materials, and its cross-sectional shape may not be other shapes of a triangle, such as an arch.
  • the isolation layer 1 is covered with a soil tillage layer 6.
  • the permanent drainage ditch of the latent layer farmland of the present invention is completely covered by the soil tillage layer 6, and does not occupy the cultivated land area.
  • the water inlet and the water outlet of the drainage ditch can be determined according to the channel, the distribution of the river, and the height of the terrain.
  • the drainage channel is provided with a lifting gate at the junction with the channel, the river and each field with a large gap. Adjust the water flow to meet the growth needs of each field crop.
  • the drainage ditch in the adjacent field is connected by the respective water outlet and water inlet, and the lifting or rotating gate is used to adjust the water level, so that the management science is flexible and convenient.
  • the width of the main body 1 of the gutter is between 220 and 400 mm, and may be increased or decreased according to actual needs. 250 mm is suitable. If the width is too wide, the single wheel of the tractor and other tilling machines may press the groove to cause damage to the groove.
  • the drainage ditch is arranged in a vertical and horizontal direction in the farmland, and the distance between each longitudinal drainage ditch is between 40 meters and 100 meters, and the distance between the horizontal grooves is 40 meters to 80 meters. The spacing is too large to affect the adjustment effect, and too small will increase the ditch. The amount of construction work causes unnecessary waste, and can be appropriately adjusted according to the local steam conditions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Sewage (AREA)

Abstract

一种潜层式农田丰产永久性排水沟，由上至下依次排列包括有隔离层（1），第一过滤层（2），第二过滤层（3），第三过滤层（4），隔离层（1）由稻草或秸秆构成，第一过滤层（2）由小石子构成，第二过滤层（3）由小石子或中石子构成，第三过滤层（4）由大石子构成，隔离层（1）上覆盖土壤耕作层（6），在第三过滤层（4）与沟底部之间设置支架（5），支架（5）与沟底部之间形成可供水流动的流水沟，支架（5）分布多条上下通透的流水缝隙或孔洞。

Description

说 明 书
潜层式农田丰产永久性排水沟
技术领域
本发明涉及一种农业生产给排水调节系统，更具体的是一种潜层 式农田丰产永久性排水沟。
背景技术
目前农业种植如水稻种植过程中， 农田插秧种植水稻， 需要插秧 时每季留好行距 （留沟距）， 或中途拔苗移株后， 再进行挖沟移土来 达到作物生长的排水搁田， 扎根壮株发育的需要， 同时这几项工作反 复常用作业， 费时费力效率低， 失误农时且导致农产品产量低下。 且 由于农田排水系统不能及时降低地上、地下水位、增加地下空气流通、 促进作物根系旺盛发达， 使农作物抗病虫害及倒伏性不足， 业界急需 一种既能起到良好的给排水功能， 又不耽误农时的给排水调节系统。 发明内容
本发明的目的是提供一种排水能力持久， 解决水流顺畅、高效降 低地上、 地下水位， 建造方便， 省时省力且坚固耐用的潜层式农田丰 产永久性排水沟。
为实现上述目的， 本发明提供以下技术方案：
一种潜层式农田丰产永久性排水沟，由上至下依次排列包括有隔 离层， 第一过滤层， 第二过滤层， 第三过滤层， 所述隔离层由稻草或 秸秆构成， 所述第一过滤层由小石子构成， 所述第二过滤层由小石子 或中石子构成， 所述第三过滤层由大石子构成， 所述隔离层上覆盖土 壤耕作层， 其中， 在所述第三过滤层与沟底部之间设置支架， 所述支 架与沟底部之间形成可供水流动的流水沟，所述支架分布多条上下通 透的流水缝隙或孔洞。
其中， 所述支架由两块在相对位置切掉一个转角的九五砖为一 组， 将其切口对接， 置于沟底并与底部组成三角空腔， 所述九五砖组 与组并列放置， 在沟底形成断面为三角形的流水沟， 所述支架上表层 说 明 书
被第三过滤层的大石子或大石块覆盖。
其中， 所述隔离层厚度为 50-80mm， 所述第一过滤层厚度为 100-180mm , 第二过滤层厚度为 100-180mm， 第三过滤层厚度为 100-180mm , 第四过滤层厚度为 90-180mm。
其中， 所述排水沟纵横交错布置且相互连通， 所述排水沟的宽度 为 250mm， 各纵向排水沟主体间距为 40米至 100米， 各横沟间距为 40米至 80米。
其中， 所述排水沟在与渠口、河口及每个田块间的连接处均设置 出水口、 入水口， 相邻田块中的排水沟由各自的出水口、 入水口相连 o
其中， 所述流水沟的断面形状为拱形。 其中， 所述支架的缝隙宽 度小于第三层过滤层的石子直径。
所述过滤层从上层至下层的石子从小至大，所述过滤层的石子可 在城镇化建设改造中拆除的旧墙、断砖和拆除水泥路面断块打碎后的 石块， 进行大、 中、 小筛选选用， 变废为宝。 所述支架由多块多孔砖沿排水沟方向排列组成，所述的多孔砖之 间留有间隙， 所述的多孔砖内有多个直向的贯通孔， 所述的贯通孔长 度方向沿排水沟方向设置， 所述的贯通孔、 间隙连通为流水沟。 所述的多孔砖上下摞成两层或多层， 所述的贯通孔为直通孔； 所 述的间隙包括多孔砖之间的纵向间隙和横向间隙，所述的纵向间隙大 于横向间隙小于第三过滤层的大石子尺寸。 所述多孔砖的贯通孔为两个， 所述的多孔砖的前后端面分别为 直面和斜面， 所述的斜面朝上， 首尾相接的多孔砖之间的端面形成向 上开口的间隙， 并连通所述的贯通孔， 形成所述的流水沟， 所述的间 说 明 书 隙小于第三过滤层的大石子尺寸； 或者所述的多孔砖的前、后端面均 为斜面。
所述的多孔砖为水泥预制件。
本发明具有以下有益效果：
1、 及时降低地上、 地下水位， 增加地下空气流通， 促进作物根 系更向土壤深处扎根， 使根系粗壮旺盛发达， 农作物抗病虫害及抗倒 伏性增强， 能使水流顺畅、 快速， 根据作物需要及时高效调节地上、 地下水位， 确保各种作物生长时需要， 稳产、 高产丰收， 建造简单、 方便、 农民一看会、 建沟成本低等特点。特别是第三过滤层下面的支 架结构的设计使过滤层上下水流更加通畅，且使底部流水沟的水流也 更加通畅， 由于支架的缝隙互相连通， 使水流毫无阻力的流向各个方 向， 加快了给排水的速度。
2、 由于所用材料设计选择防锈、 防腐烂的砖或石块构成， 无需 年年建构， 不误农时， 农民几代人受益， 特别是将拆除的建筑材料再 利用实现了废物利用变废为宝和节能环保。
3、 不占用农田面积， 更能扩大种植面积， 方便农业机械化操作， 适合大农业现代化的发展。
4、 由于是潜层排水， 农田种植表层化肥、 农药有毒污染水不直 接排放到河流、 湖泊， 使农田土壤不容易流失， 河床不会抬高， 能净 化水质， 使水质清澈， 绿色环保， 饮用水更安全， 对人类身体健康永 久有益。
5、 适应我国广大农村地区， 建造方便、 简单， 易就地取材。 附图说明
图 1是本发明的潜层式农田丰产永久性排水沟的结构示意图。 图 2是图 1的 A-A截面剖视图。 说 明 书
图 3是本发明另一个实施例的截面示意图。
图 4是图 3的横截面示意图。
图 5是本发明的另一种实施例的立体示意图。
图 6是图 5的截面示意图。
图中： 1-隔离层 2-第一过滤层 3-第二过滤层 4-第三过滤层 5- 支架 6-土壤耕作层 7-多孔砖 71-直向贯通孔 72-纵向间隙， 711-前端 面, 712-后端面。
具体实施方式
请参照图 1、 图 2所示， 为本发明的潜层式农田丰产永久性排水沟， 包括有隔离层 1， 第一过滤层 2， 第二过滤层 3， 第三过滤层 4， 所述 隔离层 1 由稻草或秸秆构成， 其厚度为 50-80mm， 该层主要起到对 泥沙及杂质的过滤阻挡作用，所述第一过滤层 2由小石子或瓜子大的 石片构成， 厚度为 100-180mm， 所述第二过滤层 3 由中石子或一寸 大小的石子构成， 厚度为 100-180mm， 所述第三过滤层 4 由大石子 或大石片或鹅蛋大小的石子构成，也可用拆墙断砖和拆除水泥路面断 块打碎石块构成， 其厚度为 100-180mm， 通过第三、 第四过滤层， 使进入沟底的水流含沙量较少， 流动较顺畅， 上述隔离层与过滤层的 厚度也可以根据因地制宜， 科学适当灵活调整。 所述的大、 中、 小石 子是过滤层之间相对比较而言的，过滤层从上至下石子大小逐层加大 即符合要求， 也可以选择相邻层的石子大小相差 0.5-2倍， 最下层的 石子最大目的使水流更畅。在所述第三过滤层 4与沟底部之间设置支 架 5， 所述支架 5分布多条上下通透的流水缝隙或孔洞， 所述缝隙宽 度小于大石子的直径， 所述支架 5 与沟底部间形成可供水流动的空 说 明 书
间。 所述支架 5 可以由两块在相对位置切掉一个转角的九五砖为一 组， 将其切口对接， 置于沟底并与沟底部组成三角形空腔， 所述九五 砖组与组并列放置， 与沟底形成断面为三角形的流水沟， 所述支架 5 上表层被第三过滤层的大石子覆盖，九五砖组与组间留有小于大石子 直径的间隙。 参见图 3、 4， 所述支架 5还可以由多块多孔砖 7沿排 水沟方向排列组成， 所述的多孔砖上下摞成两层或多层， 所述的多孔 砖 7之间留有间隙， 该间隙包括砖与砖之间的纵向间隙 72及上下层 砖之间的横向间隙， 所述的多孔砖 7 内有多个直向的贯通孔 71， 所 述的贯通孔 71长度沿排水沟方向设置，所述的各间隙与贯通孔 71连 通、 与上一过滤层连通。所述的间隙 72与贯通孔 71连通、 与上一过 滤层连通并自然形成底层流水沟。这样水流从第三过滤层 4下来后从 砖 7与砖的间隙、直向贯通孔形成的底层流水沟快速排出。所述多孔 砖之间只是叠摞在一起不用砌缝， 以保证砖与砖之间留有缝隙。
参见图 5、 6， 是本发明的所述支架为多孔砖的另一个实施例， 所述多孔砖 7的贯通孔为两个， 所述的多孔砖 7的前端面 711、 后端 面 712分别为斜面和直面， 所述的斜面朝上， 首尾相接的多孔砖之间 的两个端面形成向上开口的间隙并连通多孔砖的孔 71， 这样水流从 第三过滤层 4下来后从砖 7与砖 7的间隙、 直向贯通孔 71形成的底 层流水沟快速排出， 所述的间隙小于第三过滤层的大石子尺寸， 防止 石子漏下。所述多孔砖之间只是叠摞、码放在一起不用砌缝， 以保证 砖与砖之间留有缝隙。所述的多孔砖的前、 后端面可以均为斜面， 这 说 明 书 样， 使得砖与砖之间的间隙更大， 但该间隙大小以控制上一过滤层的 石子不漏下宜。 所述的多孔砖可以为水泥预制件。
另外， 所述支架 5也可使用其他耐腐蚀和再生材料制成， 其断面 形状也可以不是三角形的其他形状， 如拱形。所述隔离层 1上覆盖土 壤耕作层 6， 本发明的潜层式农田丰产永久性排水沟完全被土壤耕作 层 6覆盖， 不占用耕地面积。
所述排水沟的入水口、 出水口可以按渠道、 河流分布、 及地势高 低确定， 所述排水沟在与渠口、河流及每个落差大的田块间连接处均 设置升降式闸门， 来调节水流量， 满足各田块作物生长需要， 相邻田 块中的排水沟由各自的出水口、入水口相连通， 并设置升降式或转动 式闸门调节水位， 做到管理科学， 灵活方便。
具体实施时排水沟主体 1的宽度在 220-400mm之间， 也可根据 实际需要增减， 以 250mm为宜， 过宽会导致拖拉机等耕作机器单个 轮压着沟体， 引起沟体损害。所述排水沟在农田中纵横交错布置， 各 纵向排水沟的间距在 40米至 100米之间， 各横沟间距为 40米至 80 米， 间距过大会影响调节效果， 过小会增加建沟施工工程量造成不必 要的浪费， 可以根据各地汽候条件作适当调整。建沟时间最好选择在 秋季水稻收割后，夏季麦田未翻前开始建造，因为此时地下水位较低， 较易保证施工质量。使用时， 地面上过多的水分经由农田耕作层 6层 层渗透， 到达第三过滤层 4， 再通过支架 5的缝隙进入沟底与支架 5 形成的水道中并流至下游排出， 水位不足时， 还可通过水道导入灌溉 用水。

Claims

权 利 要 求 书
1、 一种潜层式农田丰产永久性排水沟， 由上至下依次排列包括有隔离层， 第一 过滤层， 第二过滤层， 第三过滤层， 所述隔离层由稻草或秸秆构成， 所述第一过 滤层由小石子构成，所述第二过滤层由小石子或中石子构成， 所述第三过滤层由 大石子构成， 所述隔离层上覆盖土壤耕作层， 其特征在于， 在所述第三过滤层与 沟底部之间设置支架，所述支架与沟底部之间形成可供水流动的流水沟， 所述支 架分布多条上下通透的流水缝隙或孔洞。
2、 如权利要求 1所述的一种潜层式农田丰产永久性排水沟， 其特征在于， 所述 支架由两块在相对位置切掉一个转角的九五砖为一组， 将其切口对接， 置于沟底 并与底部组成三角空腔，所述九五砖组与组并列放置，在沟底形成断面为三角形 的流水沟， 所述支架上表层被第三过滤层覆盖。
3、 如权利要求 1所述的潜层式农田丰产永久性排水沟， 其特征在于， 所述隔离 层厚度为 50- 80mm， 所述第一过滤层厚度为 100- 180mm， 第二过滤层厚度为 100-180 第三过滤层厚度为 100-180 第四过滤层多孔砖厚度为 90_180mm。
4、 如权利要求 1所述的潜层式农田丰产永久性排水沟， 其特征在于， 所述排水 沟纵横交错布置且相互连通， 所述排水沟的宽度为 250mm， 各纵向排水沟主体间 距为 40米至 100米， 各横沟间距为 40米至 80米。
5、 如权利要求 1所述的潜层式农田丰产永久性排水沟， 其特征在于， 所述排水 沟在与渠口、河口及每个田块间的连接处均设置出水口、入水口， 相邻田块中的 排水沟由各自的出水口、 入水口相连通。
6、 如权利要求 1所述的潜层式农田丰产永久性排水沟， 其特征在于， 所述流水 沟的断面形状为拱形。
7、 如权利要求 1所述的潜层式农田丰产永久性水沟， 其特征在于， 所述支架的 缝隙宽度小于第三层过滤层的石子直径。
8、 如权利要求 1所述的潜层式农田丰产永久性水沟， 其特征在于， 所述过滤层 从上层至下层的石子从小至大，所述过滤层的石子是拆墙断砖和拆除水泥路面断 块打碎的石块。
9、 如权利要求 1所述的潜层式农田丰产永久性水沟， 其特征在于， 所述支架由 权 利 要 求 书 多块多孔砖沿排水沟方向排列组成， 所述的多孔砖之间留有间隙， 所述的多孔砖 内有多个直向的贯通孔， 所述的贯通孔长度沿排水沟方向设置， 所述的贯通孔、 间隙连通为流水沟。
10、如权利要求 9所述的潜层式农田丰产永久性水沟， 其特征在于， 所述的多孔 砖上下摞成两层或多层，所述的贯通孔为直通孔； 所述的间隙包括多孔砖之间的 纵向间隙和横向间隙，所述的纵向间隙大于横向间隙小于第三过滤层的大石子尺 寸。
11、如权利要求 9所述的潜层式农田丰产永久性水沟， 其特征在于： 所述多孔砖 的贯通孔为两个， 所述的多孔砖的前、后端面分别为斜面和直面， 所述的斜面朝 上， 首尾相接的多孔砖之间的端面形成向上开口的间隙， 并连通所述的贯通孔， 形成所述的流水沟， 所述的间隙小于第三过滤层的大石子尺寸。
12、 如权利要求 11所述的潜层式农田丰产永久性水沟， 其特征在于： 所述的多 孔砖的前、 后端面均为斜面。
13、如权利要求 9、 10、 11、 12所述的潜层式农田丰产永久性水沟， 其特征在于： 所述的多孔砖为水泥预制件。
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