CN210684503U - Debris flow anti-impact rib sill structure and system - Google Patents
Debris flow anti-impact rib sill structure and system Download PDFInfo
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- CN210684503U CN210684503U CN201921411631.7U CN201921411631U CN210684503U CN 210684503 U CN210684503 U CN 210684503U CN 201921411631 U CN201921411631 U CN 201921411631U CN 210684503 U CN210684503 U CN 210684503U
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Abstract
The utility model discloses a mud-rock flow scour protection rib threshold structure and system has solved high earth grade of mixing of current mud-rock flow scour protection rib threshold, low shear strength, easy wearing and tearing and strike cracked, leads to mud-rock flow scour protection rib threshold security low, the high problem of later maintenance expense. The utility model relates to a mud-rock flow scour protection rib threshold structure, including retaining wall, scour protection rib threshold, the retaining wall sets up in the both sides of mud-rock flow channel, and scour protection rib threshold sets up in the mud-rock flow channel, the retaining wall is connected with scour protection rib threshold and becomes an organic whole; the anti-impact rib sills are symmetrically distributed in a V shape along the center line of the plane of the debris flow channel, the top ends of the V-shaped anti-impact rib sills are positioned at the center line of the debris flow channel, and the top ends of the anti-impact rib sills are positioned at the upstream of the debris flow; the foundation at the lower part of the anti-impact rib sill is buried underground in the debris flow gully bed, and the cross section of the anti-impact rib sill is of a vertical step type.
Description
Technical Field
The utility model relates to a mud-rock flow prevention and cure engineering design application technology field, concretely relates to mud-rock flow scour protection rib threshold structure and system.
Background
The debris flow is one of main geological disasters in China, particularly in southwest mountainous areas, the terrain gradient of a debris flow gully is large, the area of the gully is relatively small, the longitudinal gradient of the debris flow gully is large, the debris flow which is exposed under the condition of heavy rainfall convergence has the characteristics of high flow speed, large debris flow discharge amount and the like, and the life and property safety of city construction, traffic facilities and gully residents of debris flow gullies is seriously threatened.
With the continuous development of national economy, particularly under the advices of 'western large development' and 'one-by-one-way', the traffic construction and the urban construction in western mountainous areas of China are fierce, the requirements and the challenges on debris flow prevention engineering are increasingly severe, and the debris flow anti-collision sill engineering is mainly used for stabilizing solid matters of debris flow and reducing the flow velocity of the debris flow by combining the 'small and steep' characteristics of a debris flow basin in the western areas.
At present, the plane design of the debris flow anti-impact rib sill is mainly linear, debris flow solid particles and impact force characteristics of the debris flow solid particles in the debris flow channel motion process enable debris flow impact force on the middle position of the anti-impact rib sill at the center line position of the debris flow channel to be strongest, and the damage angle of concrete under the external force condition is about 45 degrees with the stress direction. In order to meet the design requirement of reducing the flow velocity of the debris flow, the shear strength design value of the traditional debris flow impact-proof rib sill is larger, and then the cost of the debris flow impact-proof rib sill is increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the high earth mark number that mixes of current mud-rock flow scour protection rib threshold, low shear strength, easy wearing and tearing and impact are cracked for traditional mud-rock flow scour protection rib threshold engineering security is low, the problem that the later maintenance expense is high, the utility model provides a solve a mud-rock flow scour protection rib threshold structure and system of above-mentioned problem, this kind of mud-rock flow scour protection rib threshold structure greatly reduced the impact shear stress of mud-rock flow, reduce the velocity of flow of mud-rock flow scour protection rib threshold, reduce the cracked possibility of impact of mud-rock flow scour protection rib threshold of mud-rock flow solid particle, reduce the cost of mud-rock flow scour protection rib threshold to and reduced scour protection rib threshold later maintenance expense.
The utility model discloses a following technical scheme realizes:
a debris flow anti-impact rib sill structure comprises retaining walls and anti-impact rib sills, wherein the retaining walls are arranged on two sides of a debris flow channel, the anti-impact rib sills are arranged in the debris flow channel, and the retaining walls and the anti-impact rib sills are connected into a whole; the anti-impact rib sills are symmetrically distributed in a V shape along the central line plane of the debris flow channel, the top ends of the V-shaped anti-impact rib sills are positioned at the central line position of the debris flow channel, and the top ends of the anti-impact rib sills are positioned at the upstream of the debris flow; the foundation at the lower part of the anti-impact rib sill is buried in the debris flow gully bed, and the cross section of the anti-impact rib sill is of a vertical step type.
The working principle is as follows: based on the high concrete grade of current mud-rock flow protecting against the rib threshold, low shear strength, easy wearing and tearing and the impact is cracked, lead to mud-rock flow protecting against the rib threshold to have the problem that the security is low, the later maintenance expense is high, the utility model adopts the above scheme protecting against the rib threshold is "V type" symmetric distribution along mud-rock flow channel central line plane, the top of "V type" protecting against the rib threshold is located mud-rock flow channel central line position, and the top position is the mud-rock flow upper reaches, protecting against the rib threshold lower part basis and buries in the mud-rock flow trench bed, the transverse section of protecting against the rib threshold is the step type of vertical type, guarantee like this that the mud-rock flow passes through the protecting against the rib threshold of first order step when coming from the upper reaches impact, weaken the velocity of mud-rock flow gradually and the impact force of mud-rock flow to each step protecting against the rib threshold, avoid traditional orthoscopic protecting against the rib threshold to impact and cut off the protecting against the rib in the twinkling of an eye when the; the V-shaped anti-impact rib sill has a stable structure, so that the impact shear stress of the debris flow is greatly reduced, the flow speed of the debris flow anti-impact rib sill is reduced, and the possibility of impact fracture of solid particles of the debris flow on the debris flow anti-impact rib sill is reduced; in addition traditional orthoscopic scour protection rib threshold is in order to satisfy the design needs that reduce the mud-rock flow velocity of flow for the shear strength design value of traditional orthoscopic scour protection rib threshold is great, and then has increased the cost of mud-rock flow scour protection rib threshold, and the utility model discloses a "V type" scour protection rib threshold structure can the significantly reduced cost of mud-rock flow scour protection rib threshold to and the scour protection rib threshold later maintenance expense has been reduced.
Preferably, the both ends of protecting against shock rib threshold are an organic whole with mud-rock flow retaining wall and link to each other, and in perpendicular mud-rock flow channel direction, protecting against shock rib threshold is certain angle α with the plane of mud-rock flow retaining wall, and wherein contained angle α epsilon (0, 45 °), when protecting against shock rib threshold and the contained angle of retaining wall are α ═ 0, protecting against shock rib threshold is traditional orthoscopic protecting against shock rib threshold, when protecting against shock rib threshold and retaining wall contained angle α ═ 45, the shear strength that protecting against shock rib threshold bore is the biggest.
Specifically, the included angle α between the anti-impact rib sill and the retaining wall is selected according to the debris flow impact force design value and the market cost, and the anti-impact rib sill is designed according to the following steps:
A. determining the unit weight gamma and the unit KN/m of the debris flow through the on-site actual measurement of the debris flow3Determining the width 2d of the debris flow channel in unit m according to field investigation of the debris flow channel, determining the gradient β of the debris flow channel in unit degree through field measurement of the debris flow channel, and determining the roughness coefficient 1/n of the debris flow channel in dimensionless mode according to debris flow disaster prevention engineering design specifications (DZ/T0220-2006) through the blocking condition of the debris flow channel;
B. determining the design flow depth H of the debris flow at the design position of the anti-impact rib sill in a unit m according to the design of the debris flow channel; determining debris flow impact force F of the design position of the debris flow anti-impact rib sill according to debris flow disaster prevention engineering design specifications (DZ/T0220-2006), and determining unit KN;
the impact force F of the debris flow on the anti-collision rib sill when the flow depth H is designed is obtained through the following formula1And the impact force F of solid particles of the debris flow2The unit KN;
(1) in the formula, F1The unit KN of the impact force of the mud-rock fluid; f2The impact pressure of the solid particles of the debris flow is the unit KN; gamma is the gravity of the debris flow and the unit kN/m3(ii) a v is the mud-rock flow velocity in units (m/s); g is gravity acceleration in m/s2；
Is the included angle between the stress surface and the debris flow stamping direction, and is the unit degree; λ is the building shape coefficient, and the circular building λ is 1.0, and the rectangle is builtBuilding λ is 1.33, and square building λ is 1.47; 1/n is the debris flow channel roughness coefficient; j is the longitudinal gradient of the debris flow channel, and the unit is thousandth; h is the debris flow channel design flow depth, unit m.
C. According to the plane included angle α between the anti-impact rib sill and the retaining wall, the reduced shear stress △ tau of the anti-impact rib sill is obtained by the following formula, unit kPa, and the increased compressive stress △ F of the anti-impact rib sill is obtained by the following formulaCThe unit KN;
(2) in the formula, the meaning of each parameter variable is shown in (1).
D. According to the included angle α between the anti-impact rib sill and the retaining wall, the increased engineering quantity of the anti-impact rib sill is obtained through the following formula, and the unit m is3；
(3) In the formula, 2d is the width of a debris flow channel and the unit m; a is the cross sectional area of the anti-impact rib sill and the unit m2；h1The height of the anti-impact rib sill on the bed surface of the ditch is in m; h is2The embedded depth of the erosion-proof rib sill upstream surface buried underground is unit m; d1The width of the cross section of the top of the anti-impact rib sill is unit m; d2The width of the transverse section of the base of the anti-impact rib sill is unit m; d3The width of the step width of the anti-collision rib sill is unit m; h is3The foundation depth of the back water surface of the anti-impact rib sill is unit m;
E. and (3) obtaining the design included angle between the debris flow impact-proof rib sill and the retaining wall on the two sides of the channel according to the formula (2) and the formula (3) and the unit price cost of the concrete market with different labels.
According to the utility model discloses a design analysis, mud-rock flow scour protection rib threshold is applicable to the mud-rock flow channel position that the channel slope is greater than 10.
In the aspect of the included angle of the anti-impact rib sill, the utility model reflects the reduced shear stress and the increased compressive stress of the anti-impact rib sill under the condition of quantitative surface runoff stress by utilizing the different plane included angles of the anti-impact rib sill; in the aspect of the square amount of the anti-impact rib sill, the concrete square amount of the anti-impact rib sill reduced relative to the linear anti-impact rib sill is quantitatively reflected by using the parameter characteristics of the plane included angle of the anti-impact rib sill.
Preferably, the proportion of the underground buried depth of the anti-impact rib sill on the upstream face to the height of the ground surface is 2: 5, the height of the underground buried depth of the step of the anti-impact rib sill on the back water surface and the height h of the underground buried depth of the anti-impact rib sill on the upstream water surface2The ratio of the underground base width of the cross section of the anti-impact rib sill to the step width of the step is 1:3, the ratio of the underground base width of the cross section of the anti-impact rib sill to the step width of the step is 9:1, and the vertical slopes of the anti-impact rib sill on the upstream surface and the downstream surface are both 90 degrees.
Preferably, the retaining wall is a vertical retaining wall.
Preferably, retaining wall and scour protection rib threshold all adopt and mix earth material, mix the anti-impact wear-resisting of earth material.
Preferably, the debris flow impact prevention rib sill structure is suitable for a debris flow channel with the channel gradient of more than 10 degrees.
The utility model provides a mud-rock flow scour protection rib threshold system, includes foretell mud-rock flow scour protection rib threshold structure, is provided with a plurality of foretell mud-rock flow scour protection rib threshold structures along the flow direction of mud-rock flow in the mud-rock flow channel, and is provided with the expansion joint between each section retaining wall.
The utility model discloses have following advantage and beneficial effect:
1. the utility model discloses come into the light from many sides of debris flow scour protection rib threshold and retaining wall contained angle and concrete unit price cost, constructed a debris flow scour protection rib threshold structure, at first, in scour protection rib threshold contained angle, utilized scour protection rib threshold's different contained angles to reflect the reduced shear stress and the increased compressive stress that scour protection rib threshold received under the quantitative surface runoff stress condition; secondly, in the aspect of the square amount of the anti-impact rib sill, the concrete square amount of the anti-impact rib sill reduced relative to the straight anti-impact rib sill is quantitatively reflected by using the included angle parameter characteristic of the anti-impact rib sill;
2. the utility model discloses a plurality of debris flow protecting against shock rib threshold structure need be set up along the flow direction of debris flow in the actual debris flow channel, and the retaining wall of debris flow channel both sides is also a section, and be provided with the expansion joint between each section retaining wall, like this when a section retaining wall damages, only need to maintain this section retaining wall, and unlikely to make whole retaining wall all receive the influence, convenient later maintenance; through a plurality of a mud-rock flow scour protection rib threshold structure realize reducing flow, falling the velocity of flow step by step, the security is high, the later maintenance expense is low.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic view of a top view structure of a debris flow anti-impact rib threshold structure of the present invention.
Fig. 2 is a schematic view of a top view structure of a debris flow anti-impact rib threshold system of the present invention.
Fig. 3 is the utility model discloses a mud-rock flow scour protection rib threshold system is along mud-rock flow channel longitudinal slope's scour protection rib threshold structure distribution schematic diagram.
Fig. 4 is a schematic cross-sectional view of a debris flow anti-impact rib threshold structure of the present invention.
Fig. 5 is the utility model discloses a mud-rock flow scour protection rib threshold structure's scour protection rib threshold atress schematic diagram under the mud-rock flow condition.
Reference numbers and corresponding part names in the drawings:
1-retaining wall, 2-expansion joint and 3-anti-impact rib sill.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
As shown in fig. 1 to 5, a debris flow anti-impact rib sill structure comprises a retaining wall 1 and an anti-impact rib sill 3, wherein the retaining wall 1 is arranged on two sides of a debris flow channel, and the anti-impact rib sill 3 is arranged in the debris flow channelThe retaining wall 1 and the anti-impact rib sill 3 are connected into a whole; the anti-collision rib sill 3 is symmetrically distributed along the central line plane of the debris flow channel in a V-shaped mode, the top end of the anti-collision rib sill 3 in the V-shaped mode is located at the central line position of the debris flow channel, and the top end position of the anti-collision rib sill 3 is located at the upstream of the debris flow. The foundation of the lower part of the anti-impact rib sill 3 is buried in a debris flow gully bed, the cross section of the anti-impact rib sill 3 is of a vertical step type, and the buried depth of the underground anti-impact rib sill 3 on the upstream surface is h2The height of the anti-impact rib sill 3 on the ground surface is h 13 ground buried depth h of water-facing side anti-impact rib sill2Height h from the earth's surface1Is that 2: 5, the vertical slope of the water-facing surface of the anti-impact rib sill 3 is 90 degrees; the underground base width of the cross section of the anti-collision rib sill 3 is d2Step width of step d3The width of the base of the anti-collision rib sill 3 is 9:1 in the step width of the step; the height of the underground buried depth of the step of the back water side anti-impact rib sill 3 is h3Height h of buried depth of step on back water surface3Height h of underground buried depth of water surface21:3, and the vertical gradient of the back surface of the anti-impact rib sill 3 is 90 degrees. The included angles between the two ends of the anti-impact rib sill 3 and the plane of the retaining wall 1 are 0-45 degrees.
In the embodiment, the retaining wall 1 is a vertical retaining wall, the retaining wall 1 and the anti-impact rib sill 3 are both made of concrete materials, and the concrete materials are anti-impact and wear-resistant; the debris flow anti-impact rib sill structure is suitable for debris flow channels with channel slopes of more than 10 degrees.
This embodiment is in order to verify the exactness and the practicality of a mud-rock flow scour protection rib threshold structure, selects Wen river earthquake district's futang ditch as the research object, wherein Wen river county futang ditch mud-rock flow regional topography belongs to the deep cutting structure on the whole and corrodes low mountain and well mountain topography, and the topography is steep on the whole in the ditch, and the topography faces sky condition and develops, and Futang ditch mud-rock flow ditch regional form is similar to the rectangle, and ditch regional area 1.12km2The length of the main channel is 0.78km, the average longitudinal ratio of the channel in the communication area is reduced by 890 thousandths (the gradient of the channel is 42 degrees), the width of the channel is 10-20 m, the average longitudinal gradient of the accumulation area is 400 thousandths (the gradient of the channel is about 22 degrees), the width of the channel is 50-100 m, the solid particles of the debris flow in the accumulation area are mainly 10-20cm, and the maximum particles are about 1 m.
7.10 debris flow disaster process is outbreak in the Fu Tang ditch of 2013Wherein the flow rate of the debris flow is: 5.78m/s, the volume weight of the debris flow is as follows: 18.5KN/m3The flow depth of the debris flow gully is as follows: 2.40m, the roughness of the debris flow gully bed is 0.445.
In order to meet the requirement of debris flow depth, the width of a debris flow anti-impact ribbed sill channel is designed to be 20m, the designed flow depth is 3m, the designed included angle between a V-shaped anti-impact ribbed sill 3 and a retaining wall 1 is α, and the included angle between the stress surface of the V-shaped anti-impact ribbed sill 3 and the debris flow stamping direction
According to the utility model provides a formula (1) can know the impact stress F of mud stone fluid1＝83.952KN，F2＝2.73×103KN, the shear stress of the V-shaped anti-collision rib threshold 3 is reduced according to the formula (2): 2.73X 103Cos α, unit KN, and the compressive stress on the V-shaped anti-collision rib sill 3 is 83.952-104.75 sin α, unit KN.
According to the unit price of the concrete in the Zhaodon city of 2017 and the tensile strength value of the axle center of the concrete in JTG D62-2004, the unit price and the strength of the concrete with different labels are shown in the following table 1.
TABLE 1 unit price and strength parameters of different grade concrete
| Concrete label | C15 | C20 | C25 | C30 | C35 |
| Market unit price/(yuan/m)3) | 240 | 250 | 260 | 280 | 310 |
| Shear strength standard value/(N/mm)2) | 1.7 | 2.1 | 2.5 | 2.85 | 3.2 |
| Standard value of compression strength/(N/mm)2) | 10 | 13.4 | 16.7 | 20.1 | 23.4 |
| Standard value of tensile strength/(N/mm)2) | 1.27 | 1.54 | 1.78 | 2.01 | 2.2 |
According to the formula (3), the increased work amount of the V-shaped anti-collision rib threshold is 20(1/cos α -1) A/(m)3). The shear strength of C30 concrete (2.85X 10) is known from the shear strength of different labeled concrete3KN/m2) Meet the design shear strength requirement of the linear anti-impact rib sill whenWhen the included angle is 20 degrees, the shear strength of the C20 meets the impact force design requirement of the V-shaped anti-collision rib sill, the cost of the C30 concrete is changed into the cost of the C25 concrete according to the formula (3), wherein the V is 260 multiplied by 2dA/cos α -280 multiplied by 2dA, and when the included angle between the anti-collision rib sill 3 and the retaining wall 1 is 20 degrees, the cost of the V-shaped anti-collision rib sill 3 is reduced by 3.3dA and unit compared with the cost of the traditional linear anti-collision rib sill.
Example 2
As shown in fig. 1 to 5, the difference between the present embodiment and embodiment 1 is that a debris flow impact prevention rib sill system includes the debris flow impact prevention rib sill structure described in embodiment 1, a plurality of debris flow impact prevention rib sill structures described in embodiment 1 are arranged in a debris flow channel along the flow direction of debris flow, and expansion joints 2 are arranged between each section of retaining wall 1.
As shown in fig. 2 and 3, a plurality of the debris flow impact-prevention rib sill structures, such as the debris flow impact-prevention rib sill structure A, B (shown in fig. 2 and 3), need to be arranged in an actual debris flow channel along a flow direction of a debris flow, and the retaining walls 1 on both sides of the debris flow channel are also in one section, and an expansion joint 2 is arranged between each section of the retaining wall 1, so that when one section of the retaining wall 1 is damaged, only the retaining wall 1 is maintained, the whole retaining wall is not affected, and the later maintenance is facilitated; through a plurality of a mud-rock flow scour protection rib threshold structure realize reducing flow, falling the velocity of flow step by step, the security is high, the later maintenance expense is low.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a mud-rock flow scour protection rib threshold structure which characterized in that: the anti-impact retaining wall comprises a retaining wall (1) and anti-impact rib sills (3), wherein the retaining wall (1) is arranged on two sides of a debris flow channel, the anti-impact rib sills (3) are arranged in the debris flow channel, and the retaining wall (1) and the anti-impact rib sills (3) are connected into a whole; the anti-collision rib sills (3) are symmetrically distributed in a V shape along the central line plane of the debris flow channel, the top ends of the V-shaped anti-collision rib sills (3) are positioned at the central line position of the debris flow channel, and the top end position of the anti-collision rib sill (3) is positioned at the upstream of the debris flow; the foundation of the lower part of the anti-impact rib sill (3) is buried in a debris flow gully bed, and the cross section of the anti-impact rib sill (3) is of a vertical step type.
2. A debris flow impact-prevention rib cage structure according to claim 1, wherein: the horizontal included angles between the two ends of the anti-impact rib sill (3) and the retaining wall (1) are 0-45 degrees.
3. A debris flow impact-prevention rib cage structure according to claim 1, wherein: the proportion of the underground buried depth of the upstream surface of the anti-impact rib sill (3) to the height of the ground surface is 2: 5.
4. a debris flow impact-prevention rib cage structure according to claim 1, wherein: the height of the underground buried depth of the step on the back surface of the anti-impact rib sill (3) and the height h of the underground buried depth of the step on the upstream surface of the anti-impact rib sill (3)2Is 1: 3.
5. A debris flow impact-prevention rib cage structure according to claim 1, wherein: the ratio of the underground base width of the cross section of the anti-impact rib sill (3) to the step width of the step is 9: 1.
6. A debris flow impact-prevention rib cage structure according to claim 1, wherein: the vertical slopes of the anti-impact rib sill (3) on the upstream surface and the downstream surface are both 90 degrees.
7. A debris flow impact-prevention rib cage structure according to claim 1, wherein: the retaining wall (1) is a vertical retaining wall.
8. A debris flow impact-prevention rib cage structure according to claim 1, wherein: retaining wall (1) all adopt the earth material with scour protection rib threshold (3).
9. A debris flow impact-prevention rib cage structure according to claim 1, wherein: the debris flow anti-impact rib sill structure is suitable for debris flow channels with channel slopes of more than 10 degrees.
10. The utility model provides a mud-rock flow scour protection rib threshold system which characterized in that: the debris flow impact prevention rib sill structure comprises the debris flow impact prevention rib sill structure as claimed in any one of claims 1 to 9, a plurality of debris flow impact prevention rib sill structures as claimed in any one of claims 1 to 9 are arranged in a debris flow channel along the flow direction of debris flow, and expansion joints (2) are arranged between each section of retaining wall (1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499719A (en) * | 2019-08-28 | 2019-11-26 | 四川建筑职业技术学院 | A kind of mud-rock flow erosion control rib sill structure and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499719A (en) * | 2019-08-28 | 2019-11-26 | 四川建筑职业技术学院 | A kind of mud-rock flow erosion control rib sill structure and system |
| CN110499719B (en) * | 2019-08-28 | 2024-07-02 | 四川建筑职业技术学院 | Debris flow anti-collision rib sill structure and system |
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