CN115030097A - Arrangement method of unidirectional grid sand rib soft raft and soft raft obtained by same - Google Patents
Arrangement method of unidirectional grid sand rib soft raft and soft raft obtained by same Download PDFInfo
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- CN115030097A CN115030097A CN202210694118.3A CN202210694118A CN115030097A CN 115030097 A CN115030097 A CN 115030097A CN 202210694118 A CN202210694118 A CN 202210694118A CN 115030097 A CN115030097 A CN 115030097A
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- 239000004576 sand Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000000725 suspension Substances 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 3
- 238000007599 discharging Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 239000004746 geotextile Substances 0.000 description 6
- 239000002689 soil Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/127—Flexible prefabricated covering elements, e.g. mats, strips bags filled at the side
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/30—Flood prevention; Flood or storm water management, e.g. using flood barriers
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Abstract
The invention discloses a method for arranging unidirectional grid sand rib soft body rows, which comprises the following steps: measuring the water surface flow velocity and the average water depth of a paved water area, setting the rotating speed of a winding drum, and determining the paving speed to obtain the relative flow velocity of water flow and the soft raft; calculating the area of the tail end water passing section of the soft row by adopting a infinitesimal method according to a water flow momentum equation and a continuous equation; measuring the included angle between the soft mattress and the horizontal direction, pushing out the suspension length of the underwater soft mattress according to the sinking velocity, and calculating to obtain the soft mattress stress on unit width; calculating checking strength; calculating the ultimate tensile strength of the unidirectional grating; checking the strength of the unidirectional grid sand rib soft body rows, determining the number of longitudinal ribs on the width of the unidirectional grid and the number of ribs of the unidirectional grid, and arranging the unidirectional grid sand rib soft body rows. The invention also discloses the soft mattress obtained by the arranging method. The high-strength unidirectional grating can bear the load of the soft raft, improve the integrity and flexibility of the soft raft body and ensure the matching degree of complex terrains.
Description
Technical Field
The invention relates to a soft raft and an arrangement method thereof, in particular to an arrangement method of a unidirectional grid sand rib soft raft and the soft raft obtained by the unidirectional grid sand rib soft raft.
Background
In recent years, the Yangtze river has rapidly developed and becomes the navigation river flow with the largest transportation volume in the world. The bank lines at the middle and lower reaches of the Yangtze river are mostly alluvial to the bank lines composed of loose sediments, and the bank slopes are easy to erode, become steep and even collapse under the action of water flow, so a large amount of bank protection projects need to be developed on the main lines of the middle and lower reaches of the Yangtze river every year.
The bank protection project is divided into an overwater slope protection part and an underwater foot protection part, wherein the underwater foot protection part is the key point of the whole bank protection project. With the improvement of ecological environment protection requirements, the exploitation of the rock blocks is strictly controlled, so that the price of the rock blocks rises greatly and the rock blocks are difficult to purchase, so that the traditional rock-throwing foot protection is increasingly difficult to adopt in the middle and lower reaches of the Yangtze river, and the thin-layer foot protection structure represented by a soft body row is increasingly wide.
The soft row structure adopted by the Yangtze river middle and lower river bank protection engineering mainly comprises a sand rib soft body row, a tied concrete block soft body row, a concrete hinge row and the like, and compared with the traditional block stone protection foot, a large amount of stone can be saved, the soft row structure is suitable for river bed deformation to a certain degree, and the engineering application of the soft row structure obtains better protection effect. However, the sinking and discharging construction of the existing soft body discharging structure highly depends on a large-scale special ship, the equipment cost is high, the requirement on constructors is high, and the working medium amount of the soft body discharging is difficult to guarantee. For example, self adjustment of the concrete hinge row is limited when the shape of the bank slope changes sharply, the row body is easy to damage, and sliding and falling of sand ribs of a sand rib soft body row are easy to occur, so that the protection effect of the bank protection engineering is influenced.
Therefore, a novel soft body row structure which is convenient to construct, easy to control quality, good in integrity and flexibility and adaptable to complex terrains is urgently needed in the field of bank protection engineering.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention aims to provide the arrangement method of the unidirectional grid sand rib soft body row, which can improve the overall flexibility of the soft body row and reduce the requirements of the soft body row on a construction ship.
The technical scheme is as follows: the invention relates to an arrangement method of a unidirectional grid sand rib soft body row, which comprises the following steps:
measuring the water surface flow velocity and the average water depth of a paved water area, setting the rotating speed of a winding drum, and determining the paving speed to obtain the relative flow velocity of water flow and a soft raft;
step two, calculating the water passing section area of the tail end of the soft body raft by adopting a infinitesimal method according to a water momentum equation and a continuous equation;
measuring the included angle between the soft mattress and the horizontal direction, pushing out the suspension length of the underwater soft mattress according to the sinking velocity, and calculating to obtain the soft mattress stress on unit width;
step four, calculating the checking intensity;
step five, calculating the ultimate tensile strength of the unidirectional grating;
and step six, checking the strength of the unidirectional grid sand rib soft body rows, determining the number of longitudinal ribs on the width of the unidirectional grid and the number of ribs of the unidirectional grid, and arranging the unidirectional grid sand rib soft body rows.
Further, the air conditioner is provided with a fan,in the first step, the calculation formula of the relative flow velocity of the water flow and the soft body row is as follows: v. of 1 V + u, wherein v 1 The relative flow velocity of the water flow and the soft body row, v is the laying speed, and u is the water surface flow velocity of the laid water area.
Further, in the second step, the calculation formula of the water passing section area of the tail end of the soft body row is as follows:
wherein A is the cross-sectional area of water, ds is the length of the micro-section of the soft body,
is the included angle between the soft mattress and the direction along the bank, and dy is the projection of the soft mattress micro-section in the vertical direction.
Further, in the third step, the calculation formula of the force applied to the soft mattress in unit width is as follows:
wherein T is the pulling force borne by the soft body, v is the laying rate, u is the water surface flow velocity of the laid water area, c is the catenary parameter, e is the natural logarithm, h is the average water depth,
the included angle between the soft raft and the direction along the shore is shown, and s is the suspension length of the underwater soft raft.
Furthermore, in the fourth step, the calculation formula of the check strength is G ═ k α T, where G is the check strength, k is 1.5, α is 1.1 to 1.3, and T is the single width force of the soft mattress.
Further, in the fifth step, the calculation formula of the ultimate tensile strength of the unidirectional grid is as follows:
wherein F is ultimate tensile strength, F is a measured longitudinal rib tension value, N is the number of longitudinal ribs on the width of the unidirectional grating, N is the number of ribs of the unidirectional grating, L is the width of the unidirectional grating, and the ultimate tensile strength F unit is KN/m.
Further, in the sixth step, the check formula of the strength of the unidirectional grid sand rib soft body row is as follows:
wherein k is 1.5; alpha is 1.1 to 1.3, v is the laying and discharging speed, u is the water surface flow velocity of the laid water area, c is the catenary parameter, e is the natural logarithm, h is the water depth,
the included angle between the soft row and the direction along the bank is formed; s is the suspension length of the underwater soft mattress, f is the tension value of the longitudinal ribs, N is the number of the longitudinal ribs on the width of the unidirectional grating, N is the number of the ribs of the unidirectional grating, and L is the width of the unidirectional grating. The strength of the unidirectional grid soft raft is checked, only the stress condition of the soft raft in the sinking and draining process is considered, and all loads such as hydrodynamic pressure, the self weight of the soft raft, additional power of a ship and the like are supposed to act on the two layers of unidirectional grids.
The unidirectional grid sand rib soft body row obtained by the arrangement method comprises unidirectional grids and inverse filtering geotextile, wherein the inverse filtering geotextile is arranged between two adjacent layers of unidirectional grids, each unidirectional grid comprises transverse ribs and longitudinal ribs, nodes are arranged on the transverse ribs and the longitudinal ribs at intervals and are fixed through clamping belts, the number of the nodes is equal to that of the ribs of a sample, and sand filling pipe bags are arranged in a space formed by enclosing the unidirectional grids and the transverse ribs of the unidirectional grids adjacent to the unidirectional grids.
Furthermore, when the unidirectional grid soft body row is used for river channel bottom protection engineering, the longitudinal ribs are arranged in the direction extending from the vertical shoreline to the center of the river channel, the transverse ribs are arranged in the direction parallel to the shoreline, and the axis of the sand filling pipe bag is arranged in the direction parallel to the shoreline. The unidirectional grating is a unidirectional tensile grating which is provided with an anti-corrosion coating and is made of polyester braided filaments. The integrity, flexibility and adaptability to complex terrains of the soft mattress are improved by means of the ultrahigh strength of the unidirectional grids.
Furthermore, the sand filling pipe bag is fixed at the transverse ribs of the two layers of unidirectional grids which are arranged in the same direction by adopting a clamping belt with one-way self-locking function, the one-way self-locking function is realized by fixing one end of the clamping belt on a certain row of double-layer transverse ribs of the unidirectional grid soft body row and fixing the other end of the clamping belt on the adjacent double-layer transverse ribs with one-way expanding and locking functions. The ballast weight is calculated according to the mass of dredged sand or solidified soil filled in each square meter of sand-filled pipe bags on the soft body row surface, and the arrangement density of the sand-filled pipe bags on the soft body row surface is determined according to the calculation result. After the ballast is finished by adopting the sand filling pipe bag ribs, the strain capacity of the drainage body is better, the drainage body can adapt to the scouring of wind waves, and the riverbed can be well protected.
Furthermore, longitudinal (vertical to the shoreline direction) splicing rows of the unidirectional grid sand rib soft body rows adopt hollow nets formed by interleaving longitudinal ribs and transverse ribs through clamping belts to carry out longitudinal linking. Transverse splicing rows (parallel water flow directions) of the unidirectional grid sand rib soft body rows adopt longitudinal ribs and transverse rib nodes which are alternately bound and stacked by clamping belts for transverse linkage.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. the high strength of the unidirectional grating is exerted to bear all loads of the soft mattress, the integrity and flexibility of the soft mattress body are improved, and the matching degree of the soft mattress to a complex terrain is ensured;
2. the construction is convenient, the quality is easy to control, and the high strength of the unidirectional grating is utilized to ensure the stable structure of the soft raft, simultaneously, a large-scale laying ship is not needed, the requirements on construction ships and mechanical equipment are reduced, the shore protection engineering cost is reduced, and the construction quality of the soft raft can be ensured;
3. the structural design of the double-layer unidirectional grid soft mattress can ensure that the anti-filtration geotextile arranged in the middle does not bear concentrated load, and the tearing phenomenon is avoided.
Drawings
FIG. 1 is a half sectional view of a unidirectional grid sand ribbed soft body row of the present invention;
FIG. 2 is a schematic structural view of a transverse row of unidirectional grid sand rib soft bodies of the invention.
Detailed Description
Referring to fig. 1-2, the unidirectional grid sand rib soft body row is composed of a bidirectional grid 1 and a reverse filtering geotextile 2 which are arranged in the same direction. The anti-filtration geotextile 2 is flatly laid between two layers of unidirectional lattices 1 which are arranged in the same direction. By means of the ultrahigh strength of the unidirectional grid 1, the integrity, the flexibility and the adaptability to complex terrains of the soft mattress are improved. Unidirectional grid 1 includes 7 horizontal ribs 4 and 5 vertical ribs 5, and the interval sets up the node on horizontal rib 4 and the vertical rib 5, and the node passes through cassette 6 to be fixed, and the quantity of node equals unidirectional grid 1's rib number n. The sand filling pipe bag 3 is fixed at the transverse ribs 4 of two layers of unidirectional grids 1 which are arranged in the same direction by adopting a clamping belt 6 with one-way self-locking function, the length of the sand filling pipe bag 3 is the same as the width (along the shore direction) of the soft row, the one-way self-locking function is realized by fixing one end of the sand filling pipe bag on a certain row of double-layer transverse ribs 4 of the unidirectional grid soft row and fixing the other end of the sand filling pipe bag on the adjacent double-layer transverse ribs 4 through a buckle with one-way expansion and locking functions. When the unidirectional grid soft body row is used for river channel bottom protection engineering, the longitudinal ribs 5 are arranged in the direction extending from the vertical shoreline to the center of the river channel, the transverse ribs 4 are arranged in the direction parallel to the shoreline, and the axis of the sand filling pipe bag 3 is arranged in the direction parallel to the shoreline. The unidirectional grid sand rib soft body row is longitudinally (vertical to the shoreline direction) spliced and arranged, and a hollow net formed by interleaving longitudinal ribs 5 and transverse ribs 4 is adopted for inserting clamping belts 6 to carry out longitudinal linking. Transverse splicing rows (parallel water flow directions) of the unidirectional grid sand rib soft body rows adopt longitudinal ribs 5 and transverse rib 4 nodes which are alternately bound and stacked by clamping belts 6 to carry out transverse connection.
The unidirectional grid 1 is a warp knitting polyester filament unidirectional stretching grid provided with an anticorrosive coating, different materials can be selected according to the actual situation of a construction site, the adjacent reverse filtering geotextile 2 is spliced by adopting a cup seaming method, double-thread sewing is carried out, the stitches are straight and uniform, and the sewing strength is not lower than 70% of the strength of the original fabric. The sand-filled pipe bag 3 is spun by woven fabric, and the sand-filled pipe bag 3 is directly filled with dredged sand or solidified soil as much as possible, thereby being beneficial to environmental protection and cost reduction.
The arrangement method of the unidirectional grid sand rib soft body row specifically comprises the following steps:
the first step is as follows: measuring the water surface flow velocity u and the average water depth h of the paved water area, determining the paving and draining speed v according to the drum rotating speed set by constructors, and enabling v 1 The relative flow rate of the water flow and the soft body row is u, v 1 ＝v+u。
The second step is that: according to water flow momentum equation and continuous equation
∑F＝ρQ(β 2 v 2 -β 1 v 1 )
Q＝v 1 A
In the formula: v. of 2 The flow velocity of the water flow on the soft body row is 0 v 1 Is the relative flow velocity of water flow and soft body row, v 1 V + u; rho is the density of water, and 1000kg/m is taken 3 (ii) a Q is the flow; beta is a 1 、β 2 Respectively taking momentum correction coefficients which are 1.05; f is the acting force of the soft mattress on the water flow; a is the water passing cross-sectional area. Because the soft body is in a nonlinear state, a infinitesimal method is adopted when the cross-section area A of the water is calculated. The water passing section area is calculated by adopting the unit width of 1 meter, and then the water passing section area at the tail end of the soft row is
In the formula: ds is the length of the micro-segment of the soft mattress;
the included angle between the soft row and the direction along the bank is formed; dy is the projection of the soft mattress micro-section in the vertical direction.
The third step: constructor measures included angle between soft row and coastal direction
Deducing the suspension length s of the underwater soft mattress according to the sinking rate, integrating the above equations and substituting the integrated equation into the equation to obtain the unit width of the soft mattress
In the formula: t is the single-width stress of the soft mattress; v is the lay-up rate; u is the water surface flow velocity of the paved water area; c is a catenary parameter; e is a natural logarithm; h is the water depth;
the included angle between the soft row and the direction along the bank is formed; s is the suspension length of the underwater soft mattress.
The fourth step: defining a check strength G, enabling G to be k alpha T, enabling k to be a ship braking coefficient, and taking 1.5; alpha is a safety coefficient, 1.1-1.3 is taken, and G unit is KN/m.
The fifth step: according to the specification of the plastic geogrid made of geosynthetics (GB/T17689-2008), the ultimate tensile strength of the unidirectional geogrid is calculated by the following formula
In the formula: f is ultimate tensile strength, F is the tensile force value of the longitudinal rib 5, and N is the number of the longitudinal ribs on the width of the unidirectional grating 1; n is the number of ribs of the unidirectional grid 1; l is the width of the unidirectional grating 1 and the ultimate tensile strength F is KN/m.
And a sixth step: and (3) checking the strength of the unidirectional grating soft mattress, and only considering the stress condition of the soft mattress in the process of sinking and draining, and assuming that all loads such as hydrodynamic pressure, the dead weight of the soft mattress, additional power of a ship and the like act on the two layers of unidirectional gratings 1. The strength of the sand rib soft body row of the unidirectional grating is checked, and the check is carried out by the double-layer unidirectional grating 1 according to all loads, namely G is less than or equal to 2F:
in the formula: k is the ship braking coefficient and is 1.5; alpha is a safety coefficient, 1.1-1.3 is taken, and v is a laying rate; u is the water surface flow velocity of the paved water area; c is a catenary parameter; e is a natural logarithm; h is the water depth;
the included angle between the soft row and the direction along the bank is formed; s is the suspension length of the underwater soft mattress, f is the tension value of the longitudinal rib 5, and N is the number of the longitudinal ribs on the width of the unidirectional grating 1; n is the number of ribs of the unidirectional grid 1; l is the width of the unidirectional grid 1.
The seventh step: and arranging the unidirectional grid sand rib soft body rows according to the longitudinal rib number N on the width of the tested unidirectional grid 1 and the rib number N of the unidirectional grid 1 obtained by calculation. The ballast weight of the unidirectional grid sand rib soft body row is calculated according to the mass of the dredged sand or the solidified soil filled in each square meter of the sand filling pipe bag 3 on the arranging surface of the soft body row, the specific calculation is calculated according to the design volume of the sand filling pipe bag 3 on each square meter of the arranging surface of the soft body row, the filling coefficient of the dredged sand pipe bag is 0.6-0.85, the filling coefficient of the solidified soil is 0.5-0.75, and the volume weight of the filler is based on the actually measured data of the engineering.
Claims (10)
1. A method for arranging unidirectional grid sand rib soft body rows is characterized by comprising the following steps:
measuring the water surface flow velocity and the average water depth of a paved water area, setting the rotating speed of a winding drum, and determining the paving speed to obtain the relative flow velocity of water flow and a soft raft;
step two, calculating the water passing section area of the tail end of the soft body raft by adopting a infinitesimal method according to a water momentum equation and a continuous equation;
measuring the included angle between the soft mattress and the horizontal direction, pushing out the suspension length of the underwater soft mattress according to the sinking velocity, and calculating to obtain the soft mattress stress on unit width;
step four, calculating the checking intensity;
step five, calculating the ultimate tensile strength of the unidirectional grating (1);
and step six, checking the strength of the unidirectional grid sand rib soft body rows, determining the number of longitudinal ribs on the width of the unidirectional grid (1) and the number of ribs of the unidirectional grid (1), and arranging the unidirectional grid sand rib soft body rows.
2. A method of arranging a unidirectional grid row of sand-ribbed soft bodies according to claim 1, wherein: in the first step, the calculation formula of the relative flow rate of the water flow and the soft body row is as follows: v. of 1 V + u, wherein v 1 The relative flow velocity of the water flow and the soft raft, v is the laying rate, and u is the water surface flow velocity of the laying water area.
3. A method of arranging a unidirectional grid row of sand-ribbed soft bodies according to claim 1, wherein: in the second step, the calculation formula of the water passing section area of the tail end of the soft row is as follows:
wherein A is the cross-sectional area of water, ds is the length of the micro-section of the soft body,
the included angle between the soft mattress and the direction along the bank is adopted, and dy is the projection of the soft mattress micro-section in the vertical direction.
4. A method of arranging unidirectional grille sand-ribbed soft body rows as claimed in claim 1, wherein: in the third step, the calculation formula of the software mattress stress on the unit width is as follows:
wherein T is the single-width stress of the soft raft, v is the laying rate, u is the water surface flow velocity of the laid water area, c is the catenary parameter, e is the natural logarithm, h is the average water depth,
the included angle between the soft raft and the direction along the shore is shown, and s is the suspension length of the underwater soft raft.
5. A method of arranging a unidirectional grid row of sand-ribbed soft bodies according to claim 1, wherein: in the fourth step, the calculation formula of the check strength is G ═ k α T, where G is the check strength, k is 1.5, α is 1.1-1.3, and T is the software row single width stress.
6. A method of arranging a unidirectional grid row of sand-ribbed soft bodies according to claim 1, wherein: in the fifth step, the calculation formula of the ultimate tensile strength of the unidirectional grille (1) is as follows:
wherein F is ultimate tensile strength, F is a tensile force value of the measured longitudinal ribs (5), N is the number of the longitudinal ribs (5) on the width of the unidirectional grating (1), N is the number of the ribs of the unidirectional grating (1), L is the width of the unidirectional grating (1), and the ultimate tensile strength F unit is KN/m.
7. A method of arranging a unidirectional grid row of sand-ribbed soft bodies according to claim 1, wherein: in the sixth step, the check formula of the strength of the unidirectional grid sand rib soft body row is as follows:
wherein k is 1.5; alpha is 1.1 to 1.3, v is the laying and discharging speed, u is the water surface flow velocity of the laid water area, c is the catenary parameter, e is the natural logarithm, h is the water depth,
the included angle between the soft row and the direction along the bank is formed; s is the suspension length of the underwater soft mattress, f is the tension value of the longitudinal rib (5), N is the number of the longitudinal ribs (5) on the width of the unidirectional grating (1), N is the number of the ribs of the unidirectional grating (1), and L is the width of the unidirectional grating (1).
8. The unidirectional grid sand-ribbed soft body row obtained by the arrangement method according to any one of claims 1 to 7, which is characterized in that: including one-way grid (1) and anti geotechnological cloth (2) of straining, anti geotechnological cloth (2) of straining sets up between adjacent two-layer one-way grid (1), one-way grid (1) is including horizontal rib (4) and vertical rib (5), the interval sets up the node on horizontal rib (4) and vertical rib (5), the node is fixed through cassette tape (6), the quantity of node equals the rib number of sample, one-way grid (1) sets up in the space that closes and form with horizontal rib (4) of adjacent one-way grid (1) and fills sand tube bag (3).
9. A unidirectional grated, sand-ribbed flexible body row according to claim 8, wherein: when the unidirectional grid soft body row is used for river channel bottom protection engineering, the longitudinal ribs (5) are arranged in the direction extending from the vertical shoreline to the center of the river channel, the transverse ribs (4) are arranged in the direction parallel to the shoreline, and the axis of the sand filling pipe bag (3) is arranged in the direction parallel to the shoreline.
10. A unidirectional grated, sand-ribbed flexible body row according to claim 8, wherein: the unidirectional grating (1) is a unidirectional stretching grating which is provided with an anti-corrosion coating and is made of polyester filaments.
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- 2022-06-17 CN CN202210694118.3A patent/CN115030097B/en active Active
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| CN115030097B (en) | 2024-01-30 |
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