Retractable blocking dam structure

Abstract

The utility model relates to a retractable blocking dam structure, which relates to the technical field of geological disaster engineering treatment and comprises a plurality of middle foundation piles, a plurality of upright posts and a blocking net. The multiple middle foundation piles are distributed in the width direction of the liquid flow channel and connected to the liquid flow channel, the multiple stand columns are hinged to the tops of the multiple middle foundation piles in a one-to-one correspondence mode so as to be switched between a first lodging state and an upright state, and the blocking net is connected to the stand columns; when the stand column is in the first falling state, the stand column and the blocking net fall to the upstream side of the liquid flow channel together. The retractable blocking dam structure has the advantages that the stand columns and the blocking net can be switched between the vertical state and the first lodging state, compared with a blocking dam in a single state in the prior art, the retractable blocking dam structure is higher in use flexibility, and the adaptability of the retractable blocking dam structure to heavy rainfall working conditions and conventional working conditions is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of geological disaster engineering treatment, in particular to a retractable retaining dam structure. Background Art

[0002] Debris flow geological disaster treatment usually adopts engineering structures such as retaining dams, retaining walls, intercepting drainage ditches and diversion channels for treatment. Among them, retaining dams mostly adopt masonry retaining dams, concrete retaining dams and reinforced concrete retaining dams, which play a role in retaining large-particle alluvial deposits of debris flow, thereby realizing the dry-wet separation of debris flow, reducing the scouring force and destructive force of debris flow, and thus reducing the risk of disaster occurrence.

[0003] However, for the retaining dam with the above structure, when there is no debris flow, the retaining dam still needs to maintain an upright structure. For the channel, it will obviously reduce the flow efficiency in the channel and also affect the normal passage in the channel. Summary of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a retractable retaining dam structure, which solves the technical problems of reducing the flow efficiency in the channel and affecting the normal passage in the channel existing in the retaining dam of the prior art.

[0006] (II) Technical Solutions

[0007] In order to achieve the above purpose, the main technical solutions adopted by the utility model include:

[0008] In the first aspect, the utility model provides a retractable retaining dam structure, including a plurality of middle piles, a plurality of columns and a retaining net; the plurality of middle piles are distributed along the width direction of the liquid flow channel and connected to the liquid flow channel, the plurality of columns are respectively hinged to the tops of the plurality of middle piles, and the retaining net is connected to the columns; the columns together with the retaining net can be switched between a first fallen state and an upright state; when the columns and the retaining net are in the first fallen state, the columns and the retaining net fall together towards the upstream side of the liquid flow channel; the columns and the retaining net can be driven by the debris flow flowing upstream in the liquid flow channel to switch to the upright state to intercept the alluvial deposits in the debris flow.

[0009] (III) Beneficial Effects

[0010] The beneficial effects of the utility model are as follows: in the retractable retaining dam structure of the utility model, the columns together with the retaining net can be switched between the upright state and the first fallen state. In non-rainy weather, the columns together with the retaining net are switched to the first fallen state, and the columns together with the retaining net fall in the channel, which does not affect the passage capacity of the channel and also improves the beauty of the channel;

[0011] In the case of heavy rainfall, debris flow impacts the columns and the barrier net, and by means of the impact force, the columns are erected, and the columns together with the barrier net are switched to an upright state, forming a retaining barrier, which plays a role in retaining alluvial materials. At the same time, the dry-wet separation of debris flow can be realized, and large particulate matters, stones and other destructive objects are blocked from moving downstream, reducing the destructive force of debris flow on downstream structures, thereby achieving the purpose of protecting the lives and property safety of downstream personnel.

[0012] In this way, compared with the single-state retaining dam in the prior art, the retractable retaining dam structure of the present invention has a higher flexibility in use, ensuring the adaptability of the retractable retaining dam structure to heavy rainfall conditions and conventional conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view structural schematic diagram of the column of the retractable retaining dam structure of the present invention when it is in an upright state;

[0014] Figure 2 It is a top view structural schematic diagram of the column of the retractable retaining dam structure of the present invention when it is in the first toppled state;

[0015] Figure 3 It is a front view structural schematic diagram of the column of the retractable retaining dam structure of the present invention when it is in an upright state;

[0016] Figure 4 It is a front view structural schematic diagram of the column of the retractable retaining dam structure of the present invention when it is in the first toppled state;

[0017] Figure 5 It is a right view structural schematic diagram of the column of the retractable retaining dam structure of the present invention when it is in an upright state;

[0018] Figure 6 It is a front view structural schematic diagram of the column of the retractable retaining dam structure of the present invention when it is in the second toppled state;

[0019] Figure 7 It is a structural schematic diagram of the top of the column of the present invention;

[0020] Figure 8 It is a sectional structural schematic diagram of the second steel wire rope of the present invention;

[0021] Figure 9 It is a right view structural schematic diagram of the connecting component of the present invention;

[0022] Figure 10 It is one of the structural schematic diagrams of the connecting seat of the present invention;

[0023] Figure 11This is the second structural schematic diagram of the connecting seat of the utility model;

[0024] Figure 12 It is a structural schematic diagram of the connection part of the utility model;

[0025] Figure 13 It is a structural schematic diagram of the connecting shaft of the utility model.

[0026] [Description of Reference Numerals]

[0027] 100: liquid flow channel;

[0028] 1: Middle foundation pile;

[0029] 2: column; 21: connection hole;

[0030] 3: The first flexible net;

[0031] 4: External foundation piles;

[0032] 5: second flexible net; 51: second net body; 52: second steel strand pull rope;

[0033] 6: connecting assembly; 61: connecting part; 62: connecting seat; 63: connecting shaft. DETAILED DESCRIPTION

[0034] In order to better explain the present invention and facilitate understanding, the following Figures 1-13 , the utility model is described in detail through specific implementation methods. Among them, the directional nouns such as "upper" and "lower" mentioned in this article are Figure 5 The orientation is used as a reference.

[0035] Embodiment 1:

[0036] Reference Figures 1-13 An embodiment of the utility model provides a retractable retaining dam structure, including a plurality of middle foundation piles 1, a plurality of columns 2 and a retaining net; the plurality of middle foundation piles 1 are distributed along the width direction of the liquid flow channel 100 and are connected to the liquid flow channel 100, the plurality of columns 2 are hinged to the tops of the plurality of middle foundation piles 1 one by one, and the retaining net is connected to the columns 2; the columns 2 together with the retaining net can be switched between a first fallen state and an upright state; when the columns 2 and the retaining net are in the first fallen state, the columns 2 and the retaining net fall together to the upstream side of the liquid flow channel 100; the columns 2 and the retaining net can be driven by the debris flow flowing on the upstream side of the liquid flow channel 100 to switch to an upright state to intercept the alluvial matter in the debris flow.

[0037] In this embodiment, the liquid flow channel 100 includes a ditch, a channel or a trench. This embodiment takes a ditch as an example. The ditch is a dry riverbed under normal circumstances. When a geological disaster occurs, debris flow flows in the ditch. The retractable retaining dam structure can separate the flood and alluvial materials in the debris flow.

[0038] The middle foundation piles 1 are installed on the channel and are designed to be multiple, and the middle foundation piles 1 are distributed along the width direction of the channel. This layout ensures that the retractable retaining dam structure can span the entire channel width and effectively intercept alluvial deposits.

[0039] The middle foundation pile 1 serves as a supporting base for the column 2 and has the important function of fixing the column 2 on the flow channel.

[0040] The columns 2 are also designed to be multiple, corresponding to the middle foundation piles 1 one by one, and are connected to the top of the middle foundation piles 1 by hinged connection. This connection method allows the columns 2 to rotate within a certain range, thereby changing their states.

[0041] The barrier net can connect adjacent columns 2, thereby forming a net bag structure for blocking alluvial deposits in the debris flow. Specifically, the barrier net can be set as an integral structure connecting each column 2, or it can be set as a split structure with the edges connected to adjacent columns 2.

[0042] The column 2 together with the barrier net can switch between the first lying state and the upright state. In non-rainy weather, the column 2 together with the barrier net switches to the first lying state to lie in the channel, which does not affect the channel's traffic capacity and also improves the channel's aesthetics;

[0043] Under heavy rainfall conditions, debris flows impact the barrier net and column 2, and with the help of the impact force, column 2 stands up and switches to an upright state, forming a barrier to block alluvial deposits. At the same time, it can achieve dry and wet separation of debris flows to a certain extent, block large particles, stones and other destructive objects from moving downstream, reduce the destructive power of debris flows on downstream structures, and thus achieve the purpose of protecting the lives and property of downstream personnel.

[0044] In this way, compared with the single-state retaining dam in the prior art, the retractable retaining dam structure of the utility model has higher flexibility in use, ensuring the adaptability of the retractable retaining dam structure to heavy rainfall conditions and conventional conditions.

[0045] This retractable retaining dam structure can be widely used in geological disaster prevention and control projects, water conservancy projects, agricultural irrigation, urban drainage and other fields, showing its unique advantages. By adjusting the state of the column 2, the flow of the medium can be precisely controlled to meet the needs of different scenarios.

[0046] Specifically, the upright column 2 can be set to switch to the upright state by manual adjustment, or can also be set to switch to the upright state under the impact of debris flow, and can be flexibly selected by relevant personnel specifically.

[0047] More specifically, the middle foundation pile 1 can be set in the liquid flow channel 100 with an embedded depth of 3 - 5 m, a pile diameter of 0.6 - 1.0 m. The pile body uses φ22 threaded steel with a spacing of 15 - 20 cm, and stirrups φ8 with a spacing of 0.2 m. Its assembly process is to select the pile position, form the hole, tie the steel bars, pour the concrete, and form the pile.

[0048] Embodiment 2:

[0049] Refer to Figures 1-13 In addition to having all the technical solutions of the above - mentioned embodiment, the embodiment of the present utility model further has the following technical solutions:

[0050] The retractable retaining dam structure further includes a linkage member, and the linkage member connects adjacent upright columns 2.

[0051] In this embodiment, the design of the linkage member is to achieve the linkage between adjacent upright columns 2. When one upright column 2 changes its state, the adjacent upright column 2 will also correspondingly change its state through the linkage member, so as to ensure the synchronization of the entire retractable retaining dam structure.

[0052] Specifically, the linkage member can be set as a towing rope.

[0053] Embodiment 3:

[0054] Refer to Figures 1-13 In addition to having all the technical solutions of any of the above - mentioned embodiments, the embodiment of the present utility model further has the following technical solutions:

[0055] The blocking net includes a first flexible net 3 connecting adjacent two upright columns 2. The top outer edge of the first flexible net 3 is connected to the top of the adjacent upright columns 2, and the bottom outer edge of the first flexible net 3 is connected to the bottom of the adjacent upright columns 2; the first flexible net 3 includes a first net body and a first steel hinge pulling rope connected to the top outer edge of the first net body. The two ends of the first steel hinge pulling rope are connected to the top of the adjacent upright columns 2, and the first steel hinge pulling rope serves as the linkage member.

[0056] In this embodiment, by using the first steel hinge pulling rope as the linkage member connecting adjacent upright columns 2, the linkage between adjacent upright columns 2 is achieved.

[0057] The first flexible net 3 includes a first net body, and the first net body is made of high - strength and wear - resistant materials such as polyester fiber and nylon. It has good flexibility and tensile strength, and can bear the impact force of debris flow on the net body.

[0058] The first steel hinge cable is designed to be able to connect the tops of adjacent columns 2. This connection method ensures that when the columns 2 fall or stand upright, the first flexible net 3 can change its position accordingly, thus maintaining the synchronization and stability between the columns 2.

[0059] Embodiment 4:

[0060] Referring to Figures 1-13 , in addition to having all the technical solutions of any of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0061] The retractable retaining dam structure further includes an external foundation pile 4. The external foundation pile 4 is located outside the middle foundation pile 1 at the outermost side distributed along the width direction of the liquid flow channel 100, and the middle foundation pile 1 is closer to the downstream of the liquid flow channel 100 than the external foundation pile 4; the retaining net further includes a triangular second flexible net 5. One corner of the second flexible net 5 is connected to the top of the external foundation pile 4, and the other two corners of the second flexible net 5 are connected to the top and bottom of the outermost column 2 to enclose the space between the external foundation pile 4 and the outermost column 2; the second flexible net 5 includes a second net body 51 and a second steel strand cable 52 connected to the outer edge of the top of the second net body 51; the second steel strand cable 52 is connected to the top of the corresponding column 2 and the top of the external foundation pile 4.

[0062] The external foundation pile 4 is outside the middle foundation pile 1 at the outermost side distributed along the width direction of the liquid flow channel 100. Such a layout provides an additional support for the entire retractable retaining dam structure. The presence of the external foundation pile 4 not only shares part of the pressure borne by the middle foundation pile 1 but also enhances the impact resistance and durability of the entire structure.

[0063] Secondly, the second flexible net 5 is connected to the external foundation pile 4 and the outermost column 2 to form a closed space. Furthermore, the second flexible net 5 can cooperate with the first flexible net 3 to more comprehensively block the alluvial materials in the debris flow in the channel, improving the blocking effect of the retractable retaining dam structure.

[0064] Since the middle foundation pile 1 is closer to the downstream of the liquid flow channel 100 than the external foundation pile 4, the steel strand cable of the second flexible net 5 will be longer compared to the setting form where the column 2 and the external foundation pile 4 are flush. When the column 2 undergoes a state change, the steel strand cable will not prevent the column 2 from undergoing a state change due to traction, thus ensuring the use reliability of the retractable retaining dam structure.

[0065] Moreover, this layout design helps to form a specific spatial layout when the column 2 is in the upright state, so as to cooperate with the second flexible net 5 on the upstream side of the column 2 to form a receiving area for alluvial materials, thereby being able to increase the maximum blocking capacity of the retractable retaining dam structure for the alluvial materials in the debris flow and improve the blocking efficiency of the blocking structure at the same time.

[0066] The second steel strand pull rope 52 connects the top of the corresponding column 2 and the top of the external pile 4, which can ensure the connection reliability and stability between the column 2 and the external pile 4, thereby improving the reliability and stability of the retractable retaining dam structure during use.

[0067] Specifically, the outer pile 4 can adopt the same structure as the middle pile 1, the first net body and the second net body 51 can adopt the same structure, and the first steel strand pull rope and the second steel strand pull rope 52 can also adopt the same structure. The second flexible net 5 includes an inner net, an outer net, a suture rope, a support rope and other parts. The inner net has a specification of 50mm×50mm, and the outer net φ8 suture rope grid net has a specification of 200mm×200mm.

[0068] The second steel strand pull rope 52 is made of 3×19 type steel strand with 3 strands, 19 steel wires in each strand, and generally has a diameter of less than 3.2 mm.

[0069] Embodiment 4:

[0070] Reference Figures 1-13 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0071] When the column 2 is in an upright state, the length of the second steel strand pull rope 52 is equal to the distance between the top of the external pile 4 and the top of the column 2 , so that the second steel strand pull rope 52 limits the swing angle of the column 2 .

[0072] In this embodiment, when the column 2 switches from the first lying state to the upright state, the second steel strand pull rope 52 is tightened, thereby limiting the maximum swing angle of the column 2 relative to the channel, so that the retractable retaining dam structure forms a structure with a certain shape, enabling it to stably and reliably separate alluvial deposits in the debris flow.

[0073] Embodiment 5:

[0074] Reference Figures 1-13 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0075] The second steel strand pull rope 52 is detachably connected to at least one of the corresponding external foundation pile 4 and the corresponding column 2, so that the column 2 can also be switched to the second lying state; when the column 2 is in the second lying state, the column 2 guides the downstream side of the liquid flow channel 100.

[0076] In this embodiment, the second steel strand guy rope 52 is detachably connected between the corresponding external foundation pile 4 and the corresponding column 2. When it is necessary to clean the alluvium blocked by the retractable retaining dam structure, the second steel strand guy rope 52 can be removed, and at the same time, the column 2 is switched to the second toppled state, so that the alluvium can be separated more conveniently, and the cleaning efficiency of the retractable retaining dam structure is improved.

[0077] After the cleaning is completed, the second steel strand guy rope 52 is reconnected to re-limit the angle of the column 2 relative to the channel, so that it cannot be switched to the second toppled state, and preparations are made to deal with the next debris flow.

[0078] In this way, the retractable retaining dam structure has higher use flexibility and can better adapt to the use requirements during its use process.

[0079] Embodiment 6:

[0080] Referring to Figures 1-13 , in addition to having all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0081] The retractable retaining dam structure further includes a connecting component 6 connecting the column 2 and the middle foundation pile 1. The connecting component 6 includes a connecting portion 61, a connecting seat 62 and a connecting shaft 63. The lower end of the column 2 is connected to the connecting portion 61. The connecting portion 61 is connected to the connecting shaft 63, and the connecting shaft 63 is connected to the connecting seat 62. At least one of the connecting portion 61 and the connecting seat 62 is rotationally connected to the connecting shaft 63 along the axis in the width direction of the liquid flow channel 100.

[0082] In this embodiment, the connecting component 6 is used to connect the column 2 and the middle foundation pile 1. The connecting component 6 includes a connecting seat 62 and a connecting shaft 63. The lower end of the column 2 is designed with a connecting portion 61, which is specifically designed to be connected to the connecting shaft 63, for example, set as a steel plate. The connecting shaft 63 serves as a medium to tightly connect the column 2 and the connecting seat 62. At least one of the connecting portion 61 and the connecting seat 62 is rotationally connected to the connecting shaft 63 along the axis in the width direction of the liquid flow channel 100, and the column 2 can rotate around the axis of the connecting shaft 63 to adapt to the need for the column 2 to switch states.

[0083] Specifically, the connecting component 6 includes a nut, a connecting column and a bolt. The bolt has a diameter of 7.9 cm and a length of 15 cm. The nut has an outer diameter of 7.9 cm and an inner diameter of 13.9 cm. The connecting portion 61 made of a steel plate has a thickness of 5 cm and there are two parallel ones. The adjacent connecting portions 61 are spaced 5 cm apart. The column 2 is set as an I-beam. The end steel plate of the I-beam column 2 has a thickness of 4.5 cm and can be smoothly inserted into the gap between the plates. The round hole has a diameter of 8 cm and the bolt can pass through smoothly.

[0084] Example 7:

[0085] Referring to Figures 1-13 , in addition to having all the technical solutions of any of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0086] There are two middle foundation piles 1, and the projections of the middle foundation piles 1 and the outer foundation piles 4 in the vertical direction are distributed in an isosceles trapezoid.

[0087] The retractable retaining dam structure with such a structure can ensure the retaining effect on the alluvium in the debris flow while reducing the number of its own components, thereby reducing the manufacturing cost and improving the assembly efficiency.

[0088] The middle foundation piles 1 and the outer foundation piles 4 distributed in an isosceles trapezoid can make the force conditions of each middle foundation pile 1 and outer foundation pile 4 more balanced when the retractable retaining dam structure is impacted by the debris flow, thereby improving the use stability of the retractable retaining dam structure.

[0089] Example 8:

[0090] Referring to Figures 1-13 , in addition to having all the technical solutions of any of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0091] The column 2 is an I-beam, the rib plate direction of the I-beam extends along the length direction of the liquid flow channel 100, and connection holes 21 for connecting the corresponding first flexible net 3 and second flexible net 5 are opened at the top of the I-beam.

[0092] In this embodiment, the I-beam with the rib plate direction extending along the direction of the liquid flow channel 100 can better match the force direction of the debris flow impact it receives, making the column 2 stronger. The connection holes 21 are used to connect the corresponding first flexible net 3 and second flexible net 5 to improve the connection efficiency between the two and the column 2, thereby improving the maintenance efficiency of the retractable retaining dam structure.

[0093] It can be understood that for the above embodiments 1-8, except for the conflicting parts, they can be freely combined to form other embodiments of the present utility model.

[0094] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0095] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation" and the like shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium; it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0096] In the present utility model, unless otherwise clearly defined and limited, when the first feature is "on" or "under" the second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on top of" the second feature, it may be that the first feature is directly above or obliquely above the second feature, or it merely means that the horizontal height of the first feature is higher than that of the second feature. When the first feature is "under", "beneath" and "underneath" the second feature, it may be that the first feature is directly below or obliquely below the second feature, or it merely means that the horizontal height of the first feature is lower than that of the second feature.

[0097] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that a process, article or device / equipment comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes the elements inherent in these processes, articles or devices / equipment.

[0098] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. A retractable retaining dam structure, characterized in that: It comprises a plurality of middle foundation piles (1), a plurality of upright columns (2) and a barrier net; The plurality of middle foundation piles (1) are distributed along the width direction of the liquid flow channel (100) and connected to the liquid flow channel (100), the plurality of columns (2) are hinged to the tops of the plurality of middle foundation piles (1) in a one-to-one correspondence, and the barrier net is connected to the columns (2); The upright post (2) together with the barrier net can be switched between a first lying state and an upright state; When the upright column (2) and the barrier net are in the first fallen state, the upright column (2) and the barrier net fall together toward the upstream side of the liquid flow channel (100); The upright column (2) and the barrier net can be driven by a debris flow flowing on the upstream side of the liquid flow channel (100) to switch to the upright state, so as to intercept alluvial deposits in the debris flow.

2. The retractable retaining dam structure according to claim 1, characterized in that: The retractable retaining dam structure also includes a linkage member, wherein the linkage member connects adjacent columns (2).

3. The retractable retaining dam structure according to claim 2, characterized in that: The barrier net comprises a first flexible net (3) connecting two adjacent columns (2), the top outer edge of the first flexible net (3) being connected to the top of the adjacent column (2), and the bottom outer edge of the first flexible net (3) being connected to the bottom of the adjacent column (2); The first flexible net (3) comprises a first net body and a first steel hinge rope connected to the outer edge of the top of the first net body, the two ends of the first steel hinge rope are connected to the top of the adjacent column (2), and the first steel hinge rope serves as the linkage member.

4. The retractable retaining dam structure according to claim 3, characterized in that: The retractable retaining dam structure further comprises external foundation piles (4), the external foundation piles (4) being located outside the outermost middle foundation piles (1) distributed along the width direction of the liquid flow channel (100), and the middle foundation piles (1) being closer to the downstream of the liquid flow channel (100) than the external foundation piles (4); The barrier net also includes a triangular second flexible net (5), one corner of which is connected to the top of the external pile (4), and the other two corners of which are connected to the top and bottom of the outermost column (2), so as to close the space between the external pile (4) and the outermost column (2); The second flexible net (5) comprises a second net body (51) and a second steel strand pull rope (52) connected to the outer edge of the top of the second net body (51); the second steel strand pull rope (52) connects the top of the corresponding column (2) and the top of the external foundation pile (4).

5. The retractable retaining dam structure according to claim 4, characterized in that: When the column (2) is in the upright state, the length of the second steel strand pull rope (52) is equal to the distance between the top of the external foundation pile (4) and the top of the column (2), so that the second steel strand pull rope (52) limits the swing angle of the column (2).

6. The retractable retaining dam structure according to claim 5, characterized in that: The second steel strand pull rope (52) is detachably connected to at least one of the corresponding external foundation pile (4) and the corresponding column (2), so that the column (2) can also be switched to a second lodging state; When the column (2) is in the second fallen state, the column (2) is directed to the downstream side of the liquid flow channel (100).

7. The retractable retaining dam structure according to claim 6, characterized in that: There are two middle foundation piles (1), and the projections of the middle foundation piles (1) and the outer foundation piles (4) along the vertical direction are distributed in an isosceles trapezoidal shape.

8. The retractable retaining dam structure according to claim 6, characterized in that: The column (2) is an I-beam, the ribs of which extend along the length direction of the liquid flow channel (100), and a connection hole (21) for connecting the first flexible net (3) and the second flexible net (5) is provided on the top of the I-beam.

9. The retractable retaining dam structure according to any one of claims 1 to 8, characterized in that: The retractable retaining dam structure further comprises a connecting assembly (6) connecting the column (2) and the middle foundation pile (1), the connecting assembly (6) comprising a connecting portion (61), a connecting seat (62) and a connecting shaft (63), the lower end of the column (2) is connected to the connecting portion (61), the connecting portion (61) is connected to the connecting shaft (63), the connecting shaft (63) is connected to the connecting seat (62), and at least one of the connecting portion (61) and the connecting seat (62) is rotatably connected to the connecting shaft (63) along the width axis of the liquid flow channel (100).

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