CN114319545A - High-impermeability concrete drainage ditch system and construction method thereof - Google Patents

Abstract

The invention relates to a high-impermeability concrete drainage ditch system and a construction method thereof, wherein a reinforced concrete water collection ditch is taken as a whole, a composite geomembrane is attached to the outer wall of the drainage ditch and is coated on the top of a soil structure by the composite geomembrane, a cushion layer is arranged outside the composite geomembrane below the reinforced concrete water collection ditch, and the soil structure is arranged outside the composite geomembrane on two sides of the reinforced concrete water collection ditch, so that the composite geomembrane is used for effectively isolating seepage water and ensuring smooth drainage. The composite geomembrane is used for coating different positions of the drainage ditch, and the wall body of the drainage ditch is turned outwards after reaching the design strength, so that the anti-permeability performance of the drainage ditch is greatly improved; a drainage anti-seepage piece is embedded at the diversion corner of the drainage ditch and fixed with the drainage ditch main body, so that water seepage is prevented, water and sundries in the drainage ditch are effectively discharged, and blockage is prevented; the stability of the combined steel template is ensured by the detachable fixing unit and the detachable supporting unit, and the construction speed is high; the water stopping effect is good; the construction is safe and convenient, and the quality is easy to control; is particularly suitable for high-grade water seepage prevention projects.

Description

High-impermeability concrete drainage ditch system and construction method thereof

Technical Field

The present invention relates to water supply; the technical field of drainage, in particular to a high-impermeability concrete drainage ditch system and a construction method thereof.

Background

The drainage ditch is a ditch for leading out water collected in a gutter, a catch water ditch, a roadbed or the like, and is widely used in various required places.

For example, in port occasions, along with the continuous development of world economy and import and export commodities, various ports serve as one of international commodity circulation infrastructure and make outstanding contribution to the national economic development, and in the construction period and the operation period of port yard engineering, yard drainage prevention engineering is very important and is a key technology for prolonging the service life of yards. As is well known, water damage disasters are one of causes of yard damage, and because of the influence of natural factors such as heavy rainfall, it is necessary to study yard drainage technology.

If again like city underground drainage system, often select incorrectly because of the well comb material of escape canal, frame comb structure linking mode, factor such as the construction process is not enough, construction misoperation leads to the escape canal to damage, and then influences the actual drainage effect of escape canal.

In the prior art, the traditional process flow of drainage ditch construction comprises the steps of excavating a base groove, pouring a cushion layer, measuring and lofting, pouring a reinforced concrete bottom plate, pouring a reinforced concrete ditch wall, prefabricating and installing a reinforced concrete cover plate, backfilling and tamping the base groove, however, for complex land yard geology or a complex urban underground drainage system, the drainage ditch construction in such a way can face a series of problems of poor water seepage prevention performance, unsmooth drainage ditch flow guide, low construction efficiency of a drainage ditch side wall template and the like; more particularly, if the current storage yard is a chemical storage yard, on the premise that the whole yard is not allowed to leak, if the water seepage prevention performance of the drainage ditch is in problem, the situation which is difficult to recover is caused.

Disclosure of Invention

The invention solves the problems in the prior art and provides an optimized high-impermeability concrete drainage ditch system and a construction method thereof.

The technical scheme includes that the drainage ditch comprises a reinforced concrete water collection ditch, a composite geomembrane is attached to the outer wall of the reinforced concrete water collection ditch in a matching mode, a cushion layer is arranged outside the composite geomembrane below the reinforced concrete water collection ditch, soil structures are arranged outside the composite geomembrane on two sides of the reinforced concrete water collection ditch, and the composite geomembrane outside the water collection ditch is covered on the top of the soil structures.

Preferably, a reinforced bar structure is arranged in the reinforced concrete catch basin; the cooperation steel bar structure is equipped with combination formula steel form and plank sheathing, and the cooperation combination formula steel form and plank sheathing are equipped with fixed unit of detachable and supporting unit.

Preferably, the steel bar structure comprises a double-layer bottom plate steel bar mesh corresponding to the bottom of the water collecting ditch, and double-layer side plate steel bar meshes are arranged at two sides of the double-layer bottom plate steel bar mesh upwards corresponding to the side walls of the water collecting ditch; the combined steel formwork is coated on the outer side wall and the top of the steel bar structure, and the wood formwork is arranged on the inner side wall of the steel bar structure and connected with the combined steel formwork.

Preferably, the fixing unit comprises a counter-pulling water stop screw rod which is arranged between the combined steel formwork and the wood formwork corresponding to any side wall of the water collecting channel in a matching manner; the supporting unit comprises an inclined supporting rod which is arranged on the outer side of the combined steel formwork corresponding to the two outer side walls of the water collecting channel in a supporting mode and a supporting rod which is arranged between the wood formworks corresponding to the two inner side walls of the water collecting channel in a supporting mode.

Preferably, the cushion layer comprises a broken stone cushion layer and a plain concrete cushion layer which are arranged from bottom to top.

Preferably, the soil structure comprises backfill soil ridges sequentially arranged on two sides of the water collecting channel, a slag ridge is arranged outside the backfill soil ridges, and water stabilizing gravel layers are arranged on the backfill soil ridges and the slag ridge in a matched manner; and the joint surface between the backfilling soil ridge and the slag ridge is inclined upwards and outwards from the bottom of the water collecting ditch.

Preferably, drainage reverse osmosis pieces are embedded at the positions of the double-layer bottom plate reinforcing mesh and the double-layer side plate reinforcing mesh between two adjacent water collecting ditches in an angle manner, and the drainage reverse osmosis pieces are matched with the angle between the two adjacent water collecting ditches; the drainage reverse osmosis piece comprises a water-facing panel and lap plates arranged at the top and the bottom of the water-facing panel in the horizontal direction, and 2 lap plates are respectively connected with the corresponding double-layer side plate reinforcing mesh and the double-layer bottom plate reinforcing mesh.

Preferably, a reinforced concrete cover plate is arranged at the top of the reinforced concrete catch basin.

Preferably, the composite geomembrane is a two-cloth one-film structure, and the two-cloth one-film structure comprises an HDPE film layer and cloth layers attached to two surfaces of the HDPE film layer.

A construction method of the high impervious concrete drain ditch system comprises the following steps:

step 1: collecting engineering geological data and compiling a construction scheme; measuring the elevation of the original ground of the drainage ditch as a basis for measuring and calculating the soil excavation amount;

step 2: measuring and lofting each operation area, and setting corresponding guide marks;

and step 3: excavating a foundation trench, reserving a protective layer with a preset height above the elevation of a substrate, and cleaning the earthwork piled around the foundation trench;

and 4, step 4: removing the protective layer, and paving a cushion layer in the base groove, wherein the plain concrete cushion layer is vibrated to be flat and solid by a flat vibrator after the paving is finished; the plain concrete cushion layer is fixed by matching channel steel or steel dies with steel rods; after the cushion layer pouring construction is finished, paving the composite geomembrane;

and 5: binding steel bars;

cleaning the base layer, putting the lower-layer bottom plate reinforcing mesh of the double-layer bottom plate reinforcing mesh, arranging a cushion block and a split heads rib on the lower-layer bottom plate reinforcing mesh, and arranging an upper-layer bottom plate reinforcing mesh sheet of the double-layer bottom plate reinforcing mesh based on the cushion block and the split heads rib; sequentially binding an outer steel bar mesh and an inner steel bar mesh of the double-layer side plate steel bar mesh on two sides of the double-layer bottom plate steel bar mesh, and arranging cushion blocks at intervals of a preset distance;

embedding a drainage reverse osmosis member in a double-layer bottom plate steel bar net between two adjacent and angled water collecting ditches, and butting the drainage reverse osmosis member with a corresponding steel bar structure;

all the steel bar cross points are spot-welded or bound by binding wires, and the cushion blocks are bound and fixed;

step 6: the combined steel templates are arranged on the outer side wall and the top of the steel bar structure, the wood templates are arranged on the inner side wall of the steel bar structure, meanwhile, the combined steel templates and the wood templates of the ditch wall of the water collecting ditch are reinforced by a plurality of pairs of drawing water stop screws, the supporting rods are arranged between the wood templates on the inner side of the water collecting ditch, the inclined supporting rods are arranged at the templates on the outer side of the ditch wall, and the integral positioning of the templates is realized;

and 7: pouring the concrete twice in a mode of firstly adopting a bottom plate and then adopting a trench wall;

and 8: after the concrete reaches the design strength, lifting the composite geomembrane to the pavement, backfilling the foundation trench outside the composite geomembrane along the drainage ditch direction to form a soil structure, and symmetrically backfilling to prevent the backfilling from being extruded;

and step 9: and after the foundation trench is backfilled, coating the composite geomembrane on the top of the soil structure to finish pavement layer laying.

The invention relates to an optimized high-impermeability concrete drainage ditch system and a construction method thereof, wherein a reinforced concrete water collection ditch is taken as a whole, a composite geomembrane is attached to the outer wall of the reinforced concrete water collection ditch and is coated on the top of a soil structure by the composite geomembrane, a cushion layer is arranged outside the composite geomembrane below the reinforced concrete water collection ditch, and the soil structure is arranged outside the composite geomembrane on two sides of the reinforced concrete water collection ditch, so that water seepage is effectively isolated by the composite geomembrane, and smooth drainage of the drainage ditch is ensured.

The invention has the beneficial effects that:

(1) the composite geomembrane is used for coating different positions of the drainage ditch, and the drainage ditch is turned outwards after the wall body of the drainage ditch reaches the design strength, so that the anti-permeability performance of the drainage ditch is greatly improved;

(2) a smooth flow guiding system is arranged in the drainage ditch, particularly at the corner, and a drainage anti-seepage piece is embedded at the flow guiding corner of the drainage ditch and fixed with the drainage ditch main body, so that water seepage is prevented, water and sundries in the drainage ditch can be effectively discharged, and blockage is prevented;

(3) the combined steel template is arranged outside the steel bar structure, the stability of the combined steel template is ensured by the detachable fixing unit and the detachable supporting unit, and the construction speed is high;

(4) the water stopping effect is good, and the ditch wall template is reinforced by the counter-pulling water stopping screw rod, so that the water stopping effect is better than that of a common counter-pulling water stopping screw rod;

(5) the construction is safe and convenient, and the quality is easy to control;

(6) the method is particularly suitable for high-grade water seepage prevention projects including but not limited to chemical storage yards and the like.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

fig. 2 is a schematic structural view of a reinforcing bar structure, a fixing unit and a supporting unit according to the present invention;

FIG. 3 is a schematic view showing the structure of the drainage reverse osmosis member of the present invention engaged with the wall of the water collecting channel;

FIG. 4 is a schematic structural view of a drainage reverse osmosis member according to the present invention;

fig. 5 is a schematic view of the layer structure of the composite geomembrane of the present invention.

Detailed Description

The present invention is described in further detail with reference to the following examples, but the scope of the present invention is not limited thereto.

As shown in the figure, the invention relates to a high-impermeability concrete drainage ditch system, which comprises a reinforced concrete water collection ditch 1, wherein a composite geomembrane 2 is attached to the outer wall of the reinforced concrete water collection ditch 1, a cushion layer is arranged outside the composite geomembrane 2 below the reinforced concrete water collection ditch 1, the composite geomembranes 2 on two sides of the reinforced concrete water collection ditch 1 are externally provided with a soil structure, and the composite geomembrane 2 outside the water collection ditch 1 is coated on the top of the soil structure.

The composite geomembrane 2 is of a two-cloth one-film structure, and the two-cloth one-film structure comprises an HDPE film layer 2-1 and cloth layers 2-2 attached to the two surfaces of the HDPE film layer.

According to the invention, the drainage ditch takes the reinforced concrete water collection ditch 1 as a main body, is built by a reinforced structure and is matched with a template to finish pouring.

According to the invention, the composite geomembrane 2 is laid on the plastic concrete cushion layer of the drainage ditch, and the composite geomembrane 2 is turned outwards after the wall body reaches the design strength, so that a high-impermeability waterproof system of the cast-in-situ drainage ditch is realized; specifically, the reinforced concrete catch basin 1 is coated with the composite geomembrane 2, the inner side of the composite geomembrane 2 is attached to the reinforced concrete catch basin 1, and the outer side of the composite geomembrane is respectively attached to a cushion layer below the catch basin 1, the side parts of the soil structure at two sides of the catch basin 1 and the top of the soil structure, so that effective seepage prevention is realized.

In the invention, the conventional structure of two cloth films is compounded with the HDPE film layer 2-1 to obtain the composite geomembrane 2, mainly because of differences of base planes in some construction environments, for example, when sharp impurities exist, the structure of two cloth films can protect the middle impermeable film, and meanwhile, the HDPE film layer 2-1 has more excellent impermeable property, and can be used under different severe geological and climatic conditions due to strong tensile strength and elongation at break, so that the strain force adapting to uneven settlement is stronger; this makes the present invention particularly useful in high-grade water seepage prevention projects, including but not limited to chemical storage yards and the like.

In the present invention, a road surface layer 3 is additionally laid on the top of the composite geomembrane 2 corresponding to the top of the soil structure.

A reinforced bar structure 4 is arranged in the reinforced concrete water collecting ditch 1; the cooperation steel bar structure 4 is equipped with combination formula steel form 5 and plank sheathing 6, and the cooperation combination formula steel form 5 and plank sheathing 6 are equipped with fixed unit of detachable and supporting unit.

The reinforcing steel bar structure 4 comprises a double-layer bottom plate reinforcing steel bar net 7 corresponding to the bottom of the water collecting ditch 1, and double-layer side plate reinforcing steel bar nets 8 are arranged on two sides of the double-layer bottom plate reinforcing steel bar net 7 and upward corresponding to the side walls of the water collecting ditch 1; the combined steel formwork 5 is coated on the outer side wall and the top of the steel bar structure 4, and the wood formwork 6 is arranged on the inner side wall of the steel bar structure 4 and connected with the combined steel formwork 5.

The fixing unit comprises a counter-pull type water stop screw 9 which is arranged between the combined type steel template 5 and the wood template 6 corresponding to any side wall of the water collecting channel 1 in a matching way; the supporting unit comprises inclined supporting rods 10 which are arranged on the outer sides of the combined steel templates 5 corresponding to the two outer side walls of the water collecting channel 1 in a propping mode and supporting rods 11 which are arranged between the wood templates 6 corresponding to the two inner side walls of the water collecting channel 1 in a propping mode.

In the invention, the combined steel formwork 5 and the steel bracket system are adopted at the water collecting ditch 1, particularly at the corner of the water collecting ditch, so that the rapid construction of the formwork of the water collecting ditch 1 is ensured.

In the invention, the whole reinforced concrete water collecting channel 1 is an internal reinforced structure 4 and a combined steel template 5 and a wood template 6 outside the reinforced concrete water collecting channel, and the construction of the water collecting channel 1 is completed by pouring; in the actual operation process, the fixing and supporting of the combined steel template 5 and the wood template 6 are particularly important, and the structural integrity and the high strength of the water collecting channel 1 can be realized only by realizing stable and reliable fixing and supporting.

According to the invention, the reinforcing steel structure 4 is provided with a double-layer bottom plate reinforcing mesh 7, two sides of the double-layer bottom plate reinforcing mesh 7 are upwards provided with a double-layer side plate reinforcing mesh 8 corresponding to the side wall of the water collecting channel 1, the configuration of the water collecting channel 1 is completed, in order to ensure the stable structure of the double-layer bottom plate reinforcing mesh 7 and the double-layer side plate reinforcing mesh 8, the reinforcing meshes are bound and welded, and meanwhile, a cushion block (not shown in the figure) is arranged between reinforcing steel bars to ensure that the reinforcing meshes are not deformed; the combined steel templates 5 are coated on the outer side wall and the top (not shown in the figure) of the steel bar structure 4, and the wood templates 6 are attached on the inner side wall of the steel bar structure 4, so that the later-stage disassembly is convenient; it is obvious that the sectional steel form 5 coated on the top of the reinforcing structure 4 is provided with a pouring gate (not shown), or the sectional steel form 5 includes a solid side plate and a steel bracket having a pouring gate, both of which are collectively called the sectional steel form 5.

In the present invention, a detachable fixing unit and a supporting unit are proposed:

the fixing unit comprises a counter-pulling type water stopping screw rod 9 which is matched and arranged on two walls (between the outer side wall and the inner side wall of each side) of the corresponding water collecting ditch 1, and the space between the steel template 5 and the wood template 6 of the ditch wall is reinforced by the counter-pulling type water stopping screw rod 9, so that the water stopping effect is better compared with that of a common counter-pulling type water stopping screw rod 9;

the supporting unit comprises an inclined supporting rod 10 which is abutted to the outer sides of two walls (between the outer sides of the two outer side walls and the base groove 12) of the corresponding water collecting ditch 1 and a supporting rod 11 which is abutted to the two walls (between the two inner side walls) of the corresponding water collecting ditch 1;

the steel templates 5 and the wood templates on each inner and outer side walls of the water collecting channel 1 are vertical and have stronger integrity through the counter-pull water stop screw rods 9 and the support rods 11, and the steel templates 5 on the outer side walls of the water collecting channel 1 are supported and stabilized through the inclined support rods 10 by utilizing the triangular principle, namely, the steel bar structures 4 and the outer templates thereof are completely shaped through the fixing units and the support units, so that the structural integrity and the seepage-proofing performance of the water collecting channel 1 are ensured to be better.

The cushion layer comprises a broken stone cushion layer 13 and a plain concrete cushion layer 14 which are arranged from bottom to top.

The soil structure comprises backfill soil ridges 15 sequentially arranged on two sides of the water collecting channel 1, a slag ridge 16 is arranged outside the backfill soil ridges 15, and water stabilizing gravel layers 17 are arranged on the backfill soil ridges 15 and the slag ridge 16 in a matched mode; the joint surface between the backfill sill 15 and the slag sill 16 is inclined upwards and outwards from the bottom of the water collecting ditch 1.

In the invention, the inclined surface at the joint surface between the backfill soil ridge 15 and the slag ridge 16 ensures that the water collecting channel 1 is not deformed or damaged by the extrusion of the soil structure.

A drainage reverse osmosis piece 18 is embedded at the positions of the double-layer bottom plate reinforcing mesh 7 and the double-layer side plate reinforcing mesh 8 between two adjacent water collecting ditches 1 which are in an angle, and the drainage reverse osmosis piece 18 is matched with the angle between the two adjacent water collecting ditches 1; the drainage reverse osmosis piece 18 comprises a water-facing panel 19 and bridging plates 20 arranged at the top and the bottom of the water-facing panel 19 in the horizontal direction, and 2 bridging plates 20 are respectively connected with the corresponding double-layer side plate reinforcing mesh 8 and the double-layer bottom plate reinforcing mesh 9.

According to the invention, the high-performance drainage reverse osmosis piece 18 is embedded at the diversion corner of the water collecting channel 1, the drainage reverse osmosis piece 18 is bound and connected with the steel bar structure 4, so that the water collection of the previous water collecting channel 1 can be quickly transited to the next water collecting channel 1 and is discharged from time to time, and if water seepage occurs, the water is returned to the outside of the water collecting channel 1 through the drainage reverse osmosis piece 18 and is continuously discharged.

In the invention, the water-facing panel 19 is used as a main component, the stable connection between the drainage reverse osmosis piece 18 and the steel bar structure 4 is realized by the lapping plate 20, the lapping plate 20 at the top of the water-facing panel 19 is connected with the double-layer side plate steel bar net 8, and the lapping plate 20 at the bottom of the water-facing panel 19 is connected with the double-layer bottom plate steel bar net 9, so that the actual effect of placing the water-facing panel in the water collecting ditch 1 is ensured; in practical applications, the water-facing panel 19 may be configured as a circular arc surface or a plane surface.

In the invention, the corner of the water collecting ditch 1 is easy to have water seepage due to the existence of a construction joint, so the drainage reverse osmosis member 18 is arranged, and the aim is that if the water seepage does exist, the water-facing panel 19 of the drainage reverse osmosis member 18 can play a role of cutting off a water seepage path, so that the relative water seepage path is increased, the seepage force is weakened, and the seepage is prevented.

In the invention, in practical application, in order to facilitate pouring, an elevating frame (not shown in the figure) can be arranged at the position of the double-layer bottom plate reinforcing steel bar net 7 at the corner, the drainage reverse osmosis piece 18 is lifted to a proper position through the elevating frame, the drainage reverse osmosis piece 18 is integrated with the groove and the groove wall of the water collecting channel 1 after pouring is finished, and the drainage efficiency of the water collecting channel 1 can be greatly improved; during binding, the drainage reverse osmosis piece 18 and the reinforcing steel bar mechanism 4 are integrally subjected to spot welding or binding, so that the position stability of the drainage reverse osmosis piece is ensured.

And a reinforced concrete cover plate 21 is arranged at the top of the reinforced concrete water collecting channel 1.

In the invention, the reinforced concrete cover plate 21 is an optimal structure, the binding and pouring of the reinforcing steel bars are conventional technology in the field, and the reinforced concrete cover plate can be set by a person skilled in the art according to the requirement, and can be embedded into the top of the water collecting channel 1 and placed on a reserved placing ridge (the upper part of the inner side wall of the water collecting channel 1) after the reinforced concrete cover plate is finished.

The invention also relates to a construction method of the high impervious concrete drainage ditch system, which comprises the following steps:

step 1: collecting engineering geological data and compiling a construction scheme; measuring the elevation of the original ground of the drainage ditch as a basis for measuring and calculating the soil excavation amount;

in the step 1, after engineering geological data is collected, the intention of design drawings needs to be learned, a construction special scheme is compiled by combining the peripheral conditions of a site, the elevation of the original ground of the drainage ditch is measured according to an elevation datum point, and the elevation is recorded, managed and rechecked and used as a basis for subsequently measuring and calculating the soil excavation amount.

Step 2: measuring and lofting each operation area, and setting corresponding guide marks (guide marks);

before the step 2 is implemented, the line measurement is performed according to the precision specified by the specification according to the design drawing and the provided measurement reference data and the measurement mark, and the measurement result is submitted to check and is used as the basis for construction lofting after approval.

And step 3: excavating a foundation trench 12, reserving a protective layer with a preset height above the elevation of the foundation, and cleaning the earth piled around the foundation trench;

in the step 3, a protective layer is arranged to avoid damaging a base soil body, the protective layer is reserved for 30-50 cm generally, and the protective layer is removed in a mechanical-manual combined mode before pouring;

in the step 3, two excavator devices can be arranged in the excavation process, one excavator device is used for excavation, the other excavator device is used for turning and loading, and the soil-free space around the foundation trench 12 is guaranteed to be loaded.

And 4, step 4: removing the protective layer, and paving a cushion layer in the base groove 12, wherein the plain concrete cushion layer 14 is stirred by adopting a site concrete stirring station, is conveyed to the site by a conveying vehicle, is unloaded into a mold, is manually paved, and is vibrated to be flat and solid by a flat vibrator after paving is finished; the plain concrete cushion layer 14 is fixed by matching channel steel or steel dies with steel brazes; after the cushion layer pouring construction is finished, paving the composite geomembrane 2;

and 5: binding steel bars;

after cleaning the base layer, putting the lower-layer bottom plate reinforcing mesh of the double-layer bottom plate reinforcing mesh 7, arranging a cushion block and a split heads rib on the lower-layer bottom plate reinforcing mesh, and arranging an upper-layer bottom plate reinforcing mesh sheet of the double-layer bottom plate reinforcing mesh 7 based on the cushion block and the split heads rib; sequentially binding an outer steel bar mesh and an inner steel bar mesh of a double-layer side plate steel bar mesh 8 on two sides of a double-layer bottom plate steel bar mesh 7, and arranging cushion blocks at preset intervals;

embedding a drainage reverse osmosis member 18 in a double-layer bottom plate steel bar net 7 between two adjacent and angled water collecting ditches 1, and butting the drainage reverse osmosis member 18 with a corresponding steel bar structure 4;

all the steel bar cross points are spot-welded or bound by binding wires, and the cushion blocks are bound and fixed;

in the step 5, when the reinforcing steel bars are installed and bound, the spacing of the reinforcing steel bars needs to meet the design requirement, all the intersection points of the reinforcing steel bars are subjected to spot welding or binding with wires, and the binding points are firmly confirmed so as to ensure the integrity of the reinforcing steel bar structure 4; when the double-layer side plate reinforcing mesh 8 of the trench wall is bound, reinforcing bar supporting measures are adopted on two sides to prevent the double-layer side plate reinforcing mesh 8 from toppling over; after the double-layer side plate reinforcing mesh 8 of the trench wall is bound, binding cushion blocks serving as trench wall reinforcing bar protection layers, wherein the cushion blocks are not less than 4 per square meter.

In the step 5, in the actual construction process, water stops can be arranged at the construction joints corresponding to the bottom plate and the ditch wall of the water collecting ditch 1 according to the situation.

Step 6: the combined steel templates 5 are arranged on the outer side wall and the top of the steel bar structure 4, the wood templates 6 are arranged on the inner side wall of the steel bar structure 4, meanwhile, a plurality of pairs of water stopping screw rods 9 are used for reinforcing the space between the combined steel templates 5 and the wood templates 6 of the channel wall of the water collecting channel 1, the support rods 11 are arranged between the wood templates 6 on the inner side of the water collecting channel 1, the inclined support rods 10 are arranged at the steel templates 5 on the outer side of the channel wall, and the integral positioning of the templates is realized;

in step 6, pre-splicing the steel templates 5 before being transported to the site, checking the smoothness of the templates and the like, and transporting the templates to the site after meeting the requirements; for the parts (deformation joints, post-cast strips and the like) which have more turnover times or special requirements, special or combined steel templates can be processed to adapt to special requirements.

In the step 6, the trench wall is reinforced by the counter-pull type water stop screw rods 9, the distance between the trench wall and the bottom is 50cm, the distance between the trench wall and the top is respectively set to be one, and the horizontal distance between the counter-pull type water stop screw rods 9 is set to be 1.0 m.

In step 6, support rods 11 are arranged between the wooden templates 6 on the inner side of the water collecting ditch 1, the steel templates 5 on the outer side of the ditch wall are reinforced by inclined support rods 10 and ditch wall top supports (if needed), and generally, the distance between each support rod 11 and each inclined support rod 10 is 60-75 cm.

And 7: pouring the concrete twice in a mode of firstly adopting a bottom plate and then adopting a trench wall; after the bottom plate is poured, the trench wall concrete is poured at proper intervals, and the phenomena of concrete holes, rotten roots, exposed stones and the like at the junction of the trench wall and the bottom plate are avoided.

And 8: after the concrete reaches the designed strength, lifting the composite geomembrane 2 to the pavement, backfilling the base groove 12 outside the composite geomembrane 2 along the drainage ditch direction to form a soil structure, wherein the backfilling adopts symmetrical backfilling to prevent the backfilling from being extruded;

and step 9: and after the foundation trench 12 is backfilled, coating the composite geomembrane 2 on the top of the soil structure, and finishing paving the pavement layer 3.

Claims (10)

1. The utility model provides a high impervious concrete escape canal system which characterized in that: the drainage ditch comprises a reinforced concrete water collection ditch, a composite geomembrane is attached to the outer wall of the reinforced concrete water collection ditch in a matching mode, a cushion layer is arranged outside the composite geomembrane under the reinforced concrete water collection ditch, soil structures are arranged outside the composite geomembranes on two sides of the reinforced concrete water collection ditch, and the composite geomembrane outside the water collection ditch is coated on the top of the soil structures.

2. The high impermeability concrete drain system of claim 1, wherein: a reinforced bar structure is arranged in the reinforced concrete water collecting ditch; the cooperation steel bar structure is equipped with combination formula steel form and plank sheathing, and the cooperation combination formula steel form and plank sheathing are equipped with fixed unit of detachable and supporting unit.

3. The highly impervious concrete drain system according to claim 2, wherein: the reinforcing steel structure comprises a double-layer bottom plate reinforcing steel mesh corresponding to the bottom of the water collecting ditch, and double-layer side plate reinforcing steel meshes are arranged at two sides of the double-layer bottom plate reinforcing steel mesh upwards corresponding to the side walls of the water collecting ditch; the combined steel formwork is coated on the outer side wall and the top of the steel bar structure, and the wood formwork is arranged on the inner side wall of the steel bar structure and connected with the combined steel formwork.

4. The highly impervious concrete drain system according to claim 2, wherein: the fixing unit comprises a counter-pulling water stop screw rod which is arranged between the combined steel template and the wood template corresponding to any side wall of the water collecting channel in a matching manner; the supporting unit comprises an inclined supporting rod which is arranged on the outer side of the combined steel formwork corresponding to the two outer side walls of the water collecting channel in a supporting mode and a supporting rod which is arranged between the wood formworks corresponding to the two inner side walls of the water collecting channel in a supporting mode.

5. The high impermeability concrete drain system of claim 1, wherein: the cushion layer comprises a broken stone cushion layer and a plain concrete cushion layer which are arranged from bottom to top.

6. The high impermeability concrete drain system of claim 1, wherein: the soil structure comprises backfilling soil ridges sequentially arranged on two sides of the water collecting ditch, a dreg ridge is arranged outside the backfilling soil ridges, and water stabilizing gravel layers are arranged on the backfilling soil ridges and the dreg ridge in a matched mode; and the joint surface between the backfilling soil ridge and the slag ridge is inclined upwards and outwards from the bottom of the water collecting ditch.

7. The highly impervious concrete drain system according to claim 3, wherein: drainage reverse-osmosis pieces are embedded at the positions of the double-layer bottom plate reinforcing mesh and the double-layer side plate reinforcing mesh between the two adjacent water collecting ditches which are in an angle, and the drainage reverse-osmosis pieces are matched with the angle between the two adjacent water collecting ditches; the drainage reverse osmosis piece comprises a water-facing panel and lap plates arranged at the top and the bottom of the water-facing panel in the horizontal direction, and 2 lap plates are respectively connected with the corresponding double-layer side plate reinforcing mesh and the double-layer bottom plate reinforcing mesh.

8. The high impermeability concrete drain system of claim 1, wherein: and a reinforced concrete cover plate is arranged at the top of the reinforced concrete catch basin.

9. The high impermeability concrete drain system of claim 1, wherein: the composite geomembrane is of a two-cloth one-film structure, and the two-cloth one-film structure comprises an HDPE film layer and cloth layers attached to two surfaces of the HDPE film layer.

10. A construction method of the high impervious concrete drain system according to any one of claims 1 to 9, wherein: the method comprises the following steps:

step 1: collecting engineering geological data and compiling a construction scheme; measuring the elevation of the original ground of the drainage ditch as a basis for measuring and calculating the soil excavation amount;

step 2: measuring and lofting each operation area, and setting corresponding guide marks;

and step 3: excavating a foundation trench, reserving a protective layer with a preset height above the elevation of a substrate, and cleaning the earthwork piled around the foundation trench;

and 4, step 4: removing the protective layer, and paving a cushion layer in the base groove, wherein the plain concrete cushion layer is vibrated to be flat and solid by a flat vibrator after the paving is finished; the plain concrete cushion layer is fixed by matching channel steel or steel dies with steel rods; after the cushion layer pouring construction is finished, paving the composite geomembrane;

and 5: binding steel bars;

cleaning the base layer, putting the lower-layer bottom plate reinforcing mesh of the double-layer bottom plate reinforcing mesh, arranging a cushion block and a split heads rib on the lower-layer bottom plate reinforcing mesh, and arranging an upper-layer bottom plate reinforcing mesh sheet of the double-layer bottom plate reinforcing mesh based on the cushion block and the split heads rib; sequentially binding an outer steel bar mesh and an inner steel bar mesh of the double-layer side plate steel bar mesh on two sides of the double-layer bottom plate steel bar mesh, and arranging cushion blocks at intervals of a preset distance;

embedding a drainage reverse osmosis member in a double-layer bottom plate steel bar net between two adjacent and angled water collecting ditches, and butting the drainage reverse osmosis member with a corresponding steel bar structure;

all the steel bar cross points are spot-welded or bound by binding wires, and the cushion blocks are bound and fixed;

step 6: the combined steel templates are arranged on the outer side wall and the top of the steel bar structure, the wood templates are arranged on the inner side wall of the steel bar structure, meanwhile, the combined steel templates and the wood templates of the ditch wall of the water collecting ditch are reinforced by a plurality of pairs of drawing water stop screws, the supporting rods are arranged between the wood templates on the inner side of the water collecting ditch, the inclined supporting rods are arranged at the templates on the outer side of the ditch wall, and the integral positioning of the templates is realized;

and 7: pouring the concrete twice in a mode of firstly adopting a bottom plate and then adopting a trench wall;

and 8: after the concrete reaches the design strength, lifting the composite geomembrane to the pavement, backfilling the foundation trench outside the composite geomembrane along the drainage ditch direction to form a soil structure, and symmetrically backfilling to prevent the backfilling from being extruded;

and step 9: and after the foundation trench is backfilled, coating the composite geomembrane on the top of the soil structure to finish pavement layer laying.

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