Jacking damage prevention structure for high underground water level channel and construction method

Abstract

The invention is suitable for the technical field of water conservancy project channel protection, and provides a high underground water level channel jacking damage prevention structure and a construction method, and the structure comprises a channel lining bottom plate side plate, a floating cover plate assembly, an inverted filter layer and geotechnical cloth. The floating cover plate can automatically open / close the drainage hole according to the floating force of underground water, and the floating force is dissipated in real time; when water is conveyed through the channel, water pressure pushes the cover plate to be tightly attached to the water stop strip, and self-adaptive seepage prevention is achieved; and the geotechnical cloth and the inverted filter layer can prevent loss of basic fine particles. The problems that in the prior art, floating force is difficult to dissipate, seepage prevention and cost are contradictory, and a foundation is prone to undermining are solved, and the method has the advantages of being self-adaptive in adjustment, good in seepage prevention effect, low in cost and easy to implement and is suitable for various water conveyance canals in high-underground-water-level areas.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of channel protection in water conservancy projects, and particularly relates to a high-underground-water-level channel anti-toppling damage structure and a construction method. BACKGROUND

[0002] When an irrigation channel or a water delivery channel is built in a high-underground-water-level area, the underground water will continuously exert a floating force on the channel bottom plate. When the floating force exceeds the self weight of the bottom plate and the upper constraint load, the bottom plate is prone to cracking and rising, and then the channel side plate is prone to instability and collapse, which seriously affects the service life of the channel and the safety of water delivery.

[0003] In the prior art, the "drainage blind pipe + filter layer" scheme is prone to blockage of the drainage channel due to silt accumulation, and the floating force cannot be dissipated in time; the "full-section anti-seepage wall" scheme can block the underground water, but the cost is high and the underground water circulation in the area is damaged, which is prone to cause surrounding geological environment problems; and the "heavy bottom plate" scheme greatly increases the construction cost and construction difficulty of the channel, and the applicability is limited. Therefore, in view of the above status, it is urgent to provide a high-underground-water-level channel anti-toppling damage structure and a construction method to overcome the deficiencies in the prior art. SUMMARY

[0004] The application aims to provide a high-underground-water-level channel anti-toppling damage structure and a construction method, and aims to solve the problems in the background.

[0005] The application is implemented as follows: a high-underground-water-level channel anti-toppling damage structure comprises a channel lining bottom plate side plate, a floating cover plate assembly, a filter layer and a geotextile.

[0006] The channel lining bottom plate side plate is provided with a plurality of rectangular grooves, and a drainage hole is arranged at the bottom of each groove.

[0007] The floating cover plate assembly comprises a floating cover plate arranged in the groove, a water-swelling rubber waterstop arranged at the edge of the groove, and an elastic support arranged at the bottom of the groove.

[0008] The filter layer is a graded sand gravel layer at the bottom of the channel side slope.

[0009] The geotextile is laid on the surface of the channel bottom plate foundation and extends to the filter layer.

[0010] As a further scheme of the application, the floating cover plate is made of reinforced concrete and has a thickness of 5-8 cm, and the gap between the floating cover plate and the groove is less than or equal to 0.5 cm.

[0011] As a further scheme of the application, the elastic support is a rubber support pad, and the height of the rubber support pad is 2-3 cm.

[0012] As a further scheme of the present application: the diameter of the drainage hole is 10-15mm, the number of the drainage holes in each groove is 3-5, and a filter screen is arranged in the drainage hole.

[0013] As a further scheme of the present application: the size of the graded sand and gravel of the filter layer is 2-5mm.

[0014] As a further scheme of the present application: the geotextile is a non-woven geotextile.

[0015] The present application also provides a construction method of the channel anti-uplift damage structure applied to the high groundwater level, comprising the following steps:

[0016] S1, excavating the channel foundation, laying the geotextile after compaction, and backfilling the sand and gravel filter layer at the bottom of the slope;

[0017] S2, opening the groove at the channel lining bottom plate side plate, and installing the elastic support and the floating cover plate;

[0018] S3, pouring the channel bottom plate concrete, and putting into use after maintenance;

[0019] When the underground water level rises, the floating cover plate opens the drainage and pressure relief; when the channel conveys water, the water pressure compacts the floating cover plate to realize the anti-seepage.

[0020] As a further scheme of the present application: in S1, the overlapping width of the geotextile and the filter layer is greater than or equal to 15cm, and is fixed by hot melting welding.

[0021] As a further scheme of the present application: in S1, the filter layer is constructed by the layered compaction, and the compaction thickness of each layer is 15cm.

[0022] As a further scheme of the present application: in S2, the opening interval of the groove is 2m*2m, and the size of the groove is 80cm*60cm*10cm.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1, self-adaptive pressure relief, protecting the structure safety: the floating cover plate can automatically open / close the drainage hole according to the uplift force, without manual operation, and can dissipate the excessive uplift force in real time, avoiding the damage of the bottom plate and the side plate from the root;

[0025] 2, bidirectional anti-seepage, giving consideration to efficiency and environmental protection: when conveying water, the water pressure realizes self-adaptive sealing, the anti-seepage effect is better than that of the traditional water stop structure, and the normal circulation of underground water is not blocked, avoiding the influence of the geological environment;

[0026] 3, foundation protection, improving the durability: the geotextile and the sand and gravel filter layer cooperate to prevent the loss of fine particles of the foundation, prolonging the overall service life of the channel;

[0027] 4. Low cost and easy implementation: The core components (floating cover plate, geotextile, and gravel) are all conventional building materials, and no special equipment is required for construction. Compared with the seepage prevention wall solution, the cost is reduced by 40%-60%, and it is suitable for various soil types and climate conditions. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is an isometric sectional view of a high groundwater level channel anti-damage structure provided by the present invention.

[0030] In the attached diagram: 1-Floating cover assembly, 2-Rubber waterstop strip, 3-Channel lining bottom plate and side plate, 4-Elastic support, 5-Filter layer, 6-Geotextile. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] The application will be further explained in conjunction with specific embodiments.

[0035] Please refer to Figure 1 The application provides a high groundwater level channel anti-uplift damage structure, which comprises a channel lining bottom plate edge plate 3, a floating cover plate assembly 1, a filter layer 5 and a geotextile 6.

[0036] The channel lining bottom plate edge plate 3 is provided with a plurality of rectangular grooves, and the bottom of each groove is provided with a drainage hole.

[0037] The floating cover plate assembly 1 comprises a floating cover plate arranged in the groove, a water-swelling rubber waterstop 2 arranged at the edge of the groove and an elastic support 4 arranged at the bottom of the groove.

[0038] The geotextile 6 is arranged on the surface of the channel bottom plate foundation and extends to the filter layer 5.

[0039] In a more specific example, the floating cover plate is made of reinforced concrete and has a thickness of 5-8 cm, and the gap between the floating cover plate and the groove is less than or equal to 0.5 cm.

[0040] In a more specific example, the drainage hole has a diameter of 10-15 mm, and the number of drainage holes in each groove is 3-5, and a filter screen is arranged in the drainage hole.

[0041] In this embodiment, the water-swelling rubber waterstop 2 is pasted on the edge of the floating cover plate, and 3-5 drainage holes with a diameter of 10-15 mm are arranged at the bottom of the groove; the floating cover plate is elevated by the elastic support 4 (such as a rubber support pad) below, and the support height is 2-3 cm. When the underground water level rises, the uplift force pushes the floating cover plate to move upward to overcome the resistance of the elastic support 4, the drainage hole is opened, the underground water is discharged through the hole, and the uplift force is quickly dissipated; when the uplift force decreases to a safety value, the floating cover plate is reset under the action of the self-weight and the elastic force of the support, the rubber waterstop 2 is tightly attached to the inner wall of the groove, and the water seepage channel is blocked.

[0042] When the channel is conveying water, the water in the channel exerts a downward pressure on the bottom plate, which further compacts the contact surface of the floating cover plate and the rubber waterstop 2, forming a self-adaptive anti-seepage effect of “the greater the water pressure, the more stringent the sealing”, thereby avoiding the seepage of water in the channel into the underground or the backflow of underground water into the channel.

[0043] At the joint between the side slope of the channel and the channel lining bottom plate edge plate 3, graded sand gravel (particle size 2-5 mm) is backfilled to form a filter layer 5, and the thickness of the filter layer 5 is 30-50 cm; a layer of geotextile 6 (specification 200-300 g / m 2The geotextile 6 extends to the filter layer 5 at one end and is anchored to the concrete bottom plate at the other end. When the groundwater is drained, the geotextile 6 and the gravel filter layer 5 jointly intercept fine particles to prevent the foundation from being washed away while ensuring smooth drainage.

[0044] Please refer to Figure 1 The embodiment of the present application also provides a construction method for the anti-toppling damage structure of the channel with high groundwater level.

[0045] 1. Foundation excavation and pretreatment: excavate according to the design section of the channel to the design bottom elevation, and compact the bottom plate foundation using a roller compactor (compaction degree ≥ 93%); open rectangular grooves (size 80 cm x 60 cm x 10 cm) on the channel lining bottom plate edge plate 3 at an interval of 2 m x 2 m, drill drainage holes (diameter 12 mm, hole distance 15 cm) at the bottom of the grooves, and lay filter screens (80-mesh nylon screen) in the holes to prevent silt from blocking.

[0046] 2. Geotextile 6 and filter layer 5 construction: fully lay 300 g / m 2 The geotextile 6 and the filter layer 5 overlap with a width of ≥ 15 cm, and are welded using hot melting; excavate a 50 cm wide and 40 cm deep trench at the bottom of the channel lining bottom plate edge plate (3) (at the junction with the bottom plate), and backfill graded sand and gravel with a particle size of 2-5 mm as the filter layer 5, and compact in layers (each layer has a compacted thickness of 15 cm).

[0047] 3. Installation of floating cover plate assembly 1: lay the elastic support 4 at the bottom of the groove, which is a rubber support pad with a thickness of 2 cm, place the prefabricated reinforced concrete floating cover plate (size 79.8 cm x 59.8 cm x 6 cm) into the groove, ensure that the water-swelling rubber weatherstrip 2 (width 3 cm) at the edge of the floating cover plate is attached to the inner wall of the groove; check the free movement of the floating cover plate to ensure that it can move up and down in the groove by 3-5 mm.

[0048] 4. Bottom plate pouring and acceptance: bind the bottom plate reinforcement (diameter 12 mm, interval 20 cm x 20 cm) above the floating cover plate, pour C25 concrete (thickness 20 cm), and after 7 days of curing, perform a water test: when the groundwater level rises to the design warning value (50 cm below the bottom plate), the floating cover plate automatically opens, the drainage capacity of the drainage hole reaches 0.5 L / s, and the channel lining bottom plate edge plate 3 does not rise; when the channel is filled with water to the design water level (water depth 1.2 m), no seepage is observed after 24 hours, and no fine particles are lost around the foundation.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A structure for preventing backlash damage to channels with high groundwater levels, characterized in that, It includes the channel lining bottom plate and side plate (3), floating cover plate assembly (1), filter layer (5) and geotextile (6); The channel lining bottom plate side plate (3) has several rectangular grooves, and drainage holes are provided at the bottom of the grooves; The floating cover assembly (1) includes a floating cover placed in the groove, a water-swellable rubber waterstop strip (2) set at the edge of the groove, and an elastic support member (4) set at the bottom of the groove; The filter layer (5) is a graded sand and gravel layer at the bottom of the channel slope; The geotextile (6) is laid on the surface of the channel bottom slab foundation and extends to the filter layer (5).

2. The anti-backflow structure for high groundwater level channels according to claim 1, characterized in that, The floating cover plate is made of reinforced concrete with a thickness of 5-8cm, and the gap between the floating cover plate and the groove is ≤0.5cm.

3. The anti-backflow structure for high groundwater level channels according to claim 1, characterized in that, The elastic support (4) is a rubber support pad with a height of 2-3cm.

4. The anti-backflow structure for high groundwater level channels according to claim 1, characterized in that, The diameter of the drainage hole is 10-15mm, and there are 3-5 drainage holes in each groove. A filter screen is installed in the drainage hole.

5. The anti-backflow structure for high groundwater level channels according to claim 1, characterized in that, The graded gravel particle size of the filter layer (5) is 2-5 mm.

6. The anti-backflow structure for high groundwater level channels according to claim 1, characterized in that, The geotextile (6) is a non-woven geotextile.

7. A construction method for an anti-backflow structure for high groundwater level channels according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Excavate the channel foundation, compact it, and then lay geotextile (6). Backfill the bottom of the slope with sand and gravel filter layer (5). S2. A groove is made in the side plate (3) of the bottom plate of the channel lining, and elastic support (4) and floating cover are installed. S3. Pour concrete for the bottom slab of the channel and put it into use after curing; When the groundwater level rises, the floating cover opens to drain and relieve pressure; when water is transported through the channel, the water pressure compacts the floating cover to prevent seepage.

8. The construction method according to claim 7, characterized in that, In S1, the overlap width between the geotextile (6) and the filter layer (5) is ≥15cm, and they are fixed by hot-melt welding.

9. The construction method according to claim 7, characterized in that, In S1, the filter layer (5) is constructed by layered compaction, with each layer having a compaction thickness of 15cm.

10. The construction method according to claim 7, characterized in that, In S2, the spacing between the grooves is 2m×2m, and the groove size is 80cm×60cm×10cm.

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