CN220202720U - Seepage-proofing cofferdam structure and cofferdam structure of reservoir - Google Patents
Seepage-proofing cofferdam structure and cofferdam structure of reservoir Download PDFInfo
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- CN220202720U CN220202720U CN202321614293.3U CN202321614293U CN220202720U CN 220202720 U CN220202720 U CN 220202720U CN 202321614293 U CN202321614293 U CN 202321614293U CN 220202720 U CN220202720 U CN 220202720U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 135
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 239000004575 stone Substances 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 239000004927 clay Substances 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 10
- 238000011010 flushing procedure Methods 0.000 claims description 10
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- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 description 24
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- 230000002265 prevention Effects 0.000 description 7
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- 238000011065 in-situ storage Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 238000005096 rolling process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
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- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
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Abstract
The utility model relates to an anti-seepage cofferdam structure and a cofferdam body structure of a reservoir. The utility model relates to an anti-seepage cofferdam structure of a reservoir, which is provided with a cofferdam body arranged in the reservoir, wherein a water interception and drainage ditch for intercepting runoffs on the reservoir is arranged on the reservoir bank of the reservoir, a working well for filtering water in the water interception and drainage ditch is arranged at the outlet of the water interception and drainage ditch, a water-through box culvert penetrating through the cofferdam body is arranged in the cofferdam body at a position above the normal water level of the reservoir, and the water-through box culvert is connected with the outlet of the working well. The cofferdam body structure used as the cofferdam body in the seepage-proofing cofferdam structure of the reservoir comprises a lower filling member arranged in the reservoir and an upper filling member arranged on the lower filling member, wherein the top surface of the lower filling member is higher than the low water level line of the reservoir, the top surface of the upper filling member is higher than the high water level line of the reservoir, and the seepage-proofing member is arranged in the lower filling member along the passing direction of the cofferdam body.
Description
Technical Field
The utility model relates to an anti-seepage cofferdam structure and a cofferdam body structure of a reservoir. Is suitable for the technical field of hydraulic engineering.
Background
Cofferdam construction is an important link of hydraulic engineering construction and is a foundation for meeting safe operation conditions. At present, most of application construction environments of the cofferdam technology of the hydraulic engineering are in a reservoir or river range, the topography is low, the construction operation area is concentrated, the water interception and drainage requirements in the construction period are high, and the cofferdam needs to meet the water blocking and seepage preventing requirements in the construction period. On the one hand, the importance of the intercepting drain arrangement. When the water intercepting and draining ditch is arranged on the site, the water intercepting and draining ditch is often arranged on the high land of the ridge, the water is automatically flowed to the water reservoir outside the weir body under a non-special condition, the large-area water collection can take a strong drainage measure, the cofferdam body is required to be bypassed, if the land of the cofferdam body is higher than the internal and external contour lines of the site, the self drainage requirement is difficult to achieve, the construction is difficult, and the construction cost is too high, and the land area and the number of the seedlings are increased. On the other hand, the cofferdam form is selected. The cofferdam construction generally adopts two forms of double-row Larson steel sheet piles and a soil-rock cofferdam, wherein clay is filled in the double-row Larson steel sheet piles and the soil-rock cofferdam to serve as seepage prevention and water stop measures, an over-water construction platform is required to be erected in construction, the construction difficulty is high, the construction period is long, and the construction cannot be carried out under geological conditions such as round gravel, shallow-buried bedrock and the like; the method has the advantages of simple structure, convenient construction, easy dismantling and low engineering cost by taking local materials and fully utilizing the excavated waste materials as cofferdam filler, but the filling materials of the main body earth-rock cofferdam basically have the problem of large permeability coefficient.
Therefore, under the condition of bad influence of external environmental factors, the method aims at solving the important problems, achieves the purposes of economy, rationality, convenience in construction, safety and stability, and is a technical problem worthy of innovation if the water interception and drainage and cofferdam scheme can be combined into a whole, and meanwhile, the advantages of the earth-rock cofferdam can be brought into play, and a good seepage prevention effect can be achieved.
Disclosure of Invention
The utility model aims to solve the technical problems that: in order to solve the technical problems, the utility model provides an anti-seepage cofferdam structure and a cofferdam body structure of a reservoir.
The technical scheme adopted by the utility model is as follows: an impermeable cofferdam structure of reservoir, its characterized in that: the water intercepting and draining device is characterized by comprising a cofferdam body arranged in a reservoir, a water intercepting and draining ditch for intercepting runoffs on the reservoir is arranged on the reservoir bank of the reservoir, a working well for filtering water in the water intercepting and draining ditch is arranged at the outlet of the water intercepting and draining ditch, and a water passing box culvert penetrating through the cofferdam body is arranged in the cofferdam body at the position above the normal water level of the reservoir and is connected with the outlet of the working well.
And a clay seal layer for fully embedding the water through box culvert and the cofferdam body is arranged outside the water through box culvert.
A filter body is arranged in the working well, and bearing sieve plates are fixedly arranged in the working well at the upper side and the lower side of the filter body;
the filter body is provided with a coarse aggregate layer arranged in the working well, fine aggregate layers are arranged in the working well on the upper side and the lower side of the coarse aggregate layer, and a supporting screen plate is arranged between the coarse aggregate layer and the fine aggregate layer.
An anti-skid ridge used for preventing water from penetrating into the cofferdam body through a gap between the water tank culvert and the cofferdam body is arranged on the slope of the cofferdam body facing the reservoir at the upper position of the water tank culvert outlet.
A drop chute is arranged on the slope surface of the cofferdam body facing the reservoir at the position below the culvert outlet of the water through tank.
And a water-flushing wall for preventing water discharged from the water-through tank culvert from flushing the cofferdam body is arranged on the slope of the cofferdam body facing the reservoir at the lower position of the water-through tank culvert outlet.
The utility model provides a cofferdam body structure, is arranged as the cofferdam body in above-mentioned prevention of seepage cofferdam structure of reservoir, its characterized in that: the dam is characterized by comprising a lower filling member arranged in a reservoir and an upper filling member arranged on the lower filling member, wherein the elevation of the top surface of the lower filling member is higher than the low water level line of the reservoir, the elevation of the top surface of the upper filling member is higher than the high water level line of the reservoir, and an impermeable member is arranged in the lower filling member along the longitudinal direction of the cofferdam body.
The anti-seepage member is provided with a stretching steel sheet pile which is anchored into the reservoir bottom from the slope toe of the upper filling member, and a water-blocking curtain is arranged in the lower filling member at one side of the stretching steel sheet pile far away from the reservoir.
A lower water facing surface slope protection is arranged on the slope of the lower filling member facing the reservoir, an upper water facing surface slope protection is arranged on the slope of the upper filling member facing the reservoir, a water facing surface slope protection is arranged on the slope of the cofferdam body far away from the reservoir, and sealing layers are arranged on the top surface of the upper filling member and the top surface of the lower filling member;
the lower water facing surface slope protection is a large stone slope protection, the upper water facing surface slope protection is provided with a transition layer, a cushion layer and a composite geomembrane which are paved on the slope surface of the upper filling member in sequence, and the water facing surface slope protection is a waterproof layer formed by mixing clay and a silt curing agent.
The lower filling member is provided with a first filling member arranged in the reservoir towards one side of the reservoir and a second filling member arranged in the reservoir away from one side of the reservoir;
the first filling member is composed of earth and stone, the second filling member is composed of fine stone slag, and the upper filling member is composed of stone slag.
The beneficial effects of the utility model are as follows: according to the utility model, the cofferdam body is filled by different soil and stone areas, so that the permeability coefficient of the cofferdam body is effectively reduced, and the seepage-proofing effect is improved; the cofferdam body is filled in stages, the contact surfaces of the bottom, the river bed and the mountain body are excavated into a step shape, the non-type contact surfaces are prevented from being effectively combined, and the seepage prevention effect is improved;
the lower filling member is provided with a large stone slope protection on the upstream surface in a manner of steel sheet pile insertion and grouting and curtain grouting, so that the stability of the whole cofferdam body can be greatly improved and the water retaining and seepage preventing functions of the whole cofferdam body can be exerted under long-time water level impact; the upper filling member is mainly used for protecting the high water level, a transition layer, a cushion layer, a composite geomembrane and a woven soil protecting surface are sequentially arranged on the upstream surface of the upper filling member, the slope protection of the upstream surface of the cofferdam body is brushed by mixing clay and a silt curing agent, and the anti-seepage performance of the inner side and the outer side of the cofferdam body is greatly exerted through the measures;
according to the utility model, the cofferdam structure is combined with drainage interception, water in the drainage interception ditch in the site passes through the cofferdam body through the working well filtering and guiding box culvert, the water self-drainage requirement is met on the elevation arrangement, the normal water level in the construction period is not exceeded, the problem that the drainage in the site can only be strongly drained due to the land topography difference of the reservoir bank and the drainage pressure can not be relieved through the self-drainage is effectively solved, and the purposes of convenience in construction and cost saving are achieved; the arrangement of the working well has the functions of filtering, sand setting, power dissipation and the like, and prevents the pollution of groundwater and water in the reservoir range; under the condition of high water level of the reservoir (exceeding the height of a penetrating box culvert), a U-shaped pipe internal and external pressure difference is formed with the box culvert and a working well, the pressure of water in the reservoir to a weir body is reduced, the water convection condition is avoided, the safety and the stability of a cofferdam structure are ensured, and meanwhile, a filter in the working well can play a role in high water level reverse flushing filtration;
according to the utility model, the water through tank culvert adopts a cast-in-situ mode, and the water through tank culvert opening is provided with the water drop tank and the anti-flushing wall, so that water flow is prevented from causing the surface flushing of the weir body; the water-through box culvert is provided with a concave notch at the non-filling interface, and clay is filled at the periphery, so that the earth and stone materials of the cofferdam body are fully embedded with the water-through box culvert, and the seepage prevention of the cofferdam body is further enhanced.
Drawings
FIG. 1 is a side cross-sectional view of the present utility model;
FIG. 2 is a schematic elevational view of the present utility model;
FIG. 3 is a top view of the present utility model;
in the figure: 1. a cofferdam body; 1-1, a first filling member; 1-2 parts of second filling components, 1-3 parts of upper filling components, 1-4 parts of upper water facing surface protection, 1-5 parts of composite geomembrane, 1-6 parts of cushion layer, 1-7 parts of transition layer, 1-8 parts of sealing layer, 1-9 parts of water blocking curtain, 1-10 parts of stretching steel sheet pile, 1-11 parts of lower water facing surface protection, 1-12 parts of back surface protection; 2. intercepting drainage ditches; 3. working well: 3-1, a supporting sieve plate, 3-2, a fine bone material layer, 3-3 and a coarse bone material layer; 4. 4-1 parts of water box culverts, 4-2 parts of anti-skid ridges and clay sealing layers; 5. an anti-impact wall; 6. and a drop chute.
Detailed Description
The present utility model will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present utility model and not limited to the following examples.
The embodiment is an impermeable cofferdam structure of a reservoir, a cofferdam body 1 is arranged in the reservoir, a drainage intercepting ditch 2 is arranged on the bank of the reservoir, the height of the outlet of the drainage intercepting ditch 2 is higher than the height H5 of the top of the cofferdam body 1, a working well 3 which is vertically arranged is connected at the outlet position of the drainage intercepting pipe, a water-through box culvert 4 is connected at the outlet position of the working well 3, and the water-through box culvert 4 penetrates through the cofferdam body 1. The runoff water on the bank of the water reservoir is discharged into the reservoir through the intercepting drainage ditch 2, the working well 3 and the water-through box culvert 4, so that the influence on the drainage in the cofferdam caused by the runoff water on the bank of the water reservoir flowing into the surrounding weir area is avoided.
In this embodiment, the cross section of the intercepting drain 2 is trapezoid, and has good water storage capacity and pressure bearing capacity.
In this embodiment, the working well 3 is a square reinforced concrete structure, and the working well 3 is connected to the intercepting drain 2 at a position which is a certain distance away from the end of the intercepting drain 2, so that a buffer belt is formed at the end of the intercepting drain 2, and the water flow in the intercepting drain 2 is subjected to a stilling effect. A filter body is arranged in the working well 3, and a bearing screen plate 3-1 is arranged in the working well 3 in the upper part and the lower part of the filter body, wherein the filter body is provided with a fine aggregate layer 3-2, a coarse aggregate layer 3-3 and a fine aggregate layer 3-2 which are sequentially arranged from top to bottom, and the bearing screen plate 3-1 is arranged between the fine aggregate layer 3-2 and the coarse aggregate layer 3-3. So, the water flow entering the water box culvert 4 in the cofferdam body 1 from intercepting the drainage ditch 2 plays a filtering role, and the phenomenon that impurities are blocked in the water box culvert 4 in the cofferdam body 1 to be inconvenient to overhaul is avoided, wherein the supporting sieve plate 3-1 plays a good supporting role on the filtering body.
In this embodiment, the water-passing box culvert 4 is connected to the outlet of the working well 3, and the bottom of the working well 3 is lower than the connection between the working well 3 and the water-passing box culvert 4, so that a certain force-dissipating effect is also achieved.
In this embodiment, the water through tank culvert 4 is arranged in the cofferdam body 1 and penetrates through the cofferdam body 1, and the outlet of the water through tank culvert 4 extends out of the slope surface of the cofferdam body 1 facing the reservoir. Thus, the runoff water on the bank of the reservoir is discharged into the reservoir through the intercepting drainage ditch 2, the working well 3 and the water-through box culvert 4, and the runoff water on the bank of the reservoir is prevented from flowing into the surrounding weir to influence the drainage in the cofferdam.
In this embodiment, the water through box culvert 4 adopts square reinforced concrete structure, and the water through box culvert 4 sets up the indent breach in non-filling interface department for prevent to lead to the fact destruction to water through box culvert 4 under the pressure effect, fill clay in the indent breach department of water through box culvert 4 simultaneously and form the clay seal, clay seal 4-2 is used for bonding water through box culvert 4 and cofferdam body 1, makes water through box culvert 4 and the abundant gomphosis of cofferdam body 1, reinforcing cofferdam body 1's impermeable capacity.
In this embodiment, an anti-slip ridge 4-1 is disposed on the upstream of the outlet of the water box culvert 4 on the water-facing slope of the cofferdam body 1, and the anti-slip ridge 4-1 is used for preventing water flow from penetrating into the cofferdam body 1 from the gap between the water box culvert 4 and the cofferdam body 1.
In this embodiment, a water-break wall 5 and a water drop tank 6 are disposed on a water-facing slope of the cofferdam body 1 below an outlet of the water-through box culvert 4, and the water-break wall 5 and the water drop tank 6 are used for performing a force-dissipating treatment on water flow discharged from the outlet of the water-through box culvert 4, so as to weaken flushing of the water flow on the side slope of the cofferdam body 1.
The cofferdam body 1 in the present embodiment has a lower filling member arranged in a reservoir and an upper filling member 1-3 arranged on the lower filling member, wherein the lower filling member has a first filling member 1-1 on the water facing side and a second filling member 1-2 on the water back side. Wherein the first filling member 1-1 is composed of earth and stone, the second filling member 1-2 is composed of fine stone slag, and the upper filling member 1-3 is composed of stone slag.
In the embodiment, a lower water facing surface slope protection 1-11 is arranged on a slope facing a reservoir on a lower filling member of a cofferdam body 1, an upper water facing surface slope protection is arranged on a slope facing the reservoir on an upper filling member 1-3, a water facing surface slope protection 1-12 is arranged on a slope far away from the reservoir on the cofferdam body 1, and sealing layers 1-8 are arranged on the top surfaces of the upper filling member 1-3 and the lower filling member. The upper water facing surface slope protection comprises an upper water facing surface protection 1-4, a transition layer 1-7, a cushion layer 1-6 and a composite geomembrane 1-5 which are paved on the water facing slope of the upper filling member 1-3 in sequence, the lower water facing surface slope protection 1-11 comprises a large stone slope protection paved on the water facing slope of the lower filling member, and the water facing surface slope protection 1-12 is a waterproof layer formed by mixing clay and a silt curing agent. Wherein, the upper water facing surface slope protection is a woven bag soil protection surface, and the thickness of the upper water facing surface slope protection is 50cm; the composite geomembrane 1-5 is an HDEP geomembrane of 400g/0.8mm/400g, and the thicknesses of the transition layer 1-7, the cushion layer 1-6, the large stone slope protection and the waterproof layer are all 50cm; the waterproof layer is formed by mixing clay and a silt curing agent according to a certain proportion and fully curing after brushing a slope; the sealing layers 1-8 are plain concrete materials.
In the embodiment, all sundries and spinel on the slope should be removed before the composite geomembrane 1-5 is paved, so that the smooth paving of the sand-free concrete layer is ensured, and the convex and concave parts are not allowed to appear.
In the embodiment, a stretching steel sheet pile 1-10 is anchored on the top surface of a lower filling member at the position of the slope toe of the water-facing slope of the upper filling member 1-3, the stretching steel sheet pile 1-10 adopts a stretching IV-shaped steel sheet pile, and the bottom of the stretching steel sheet pile 1-10 stretches into the position of a reservoir bottom covering layer 5 m. The joint of the stretching steel sheet pile 1-10 and the composite geomembrane 1-5 is provided with an expansion joint, and the length of the overlapped part of the expansion joint after being folded is more than 0.5m for ensuring good extensibility of the expansion joint.
In this embodiment, water-blocking curtains 1 to 9 are provided in a lower filling member at a side of the tensile steel sheet piles 1 to 10 remote from the reservoir. The water-blocking curtains 1 to 9 are formed by pouring slurry into the cofferdam body 1 by curtain grouting.
In this embodiment, the height H2 of the top of the lower filling member is higher than the low water level H1 of the reservoir, the height H5 of the top of the cofferdam body 1 is higher than the high water level H4 of the reservoir, and the height H5 of the top of the working well 3 is higher than the height H5 of the top of the cofferdam body 1. Thus, as long as the water in the reservoir does not overflow, the function of the working well 3 not only plays roles of buffering and filtering, but also can form a mutual passage pipe inside and outside the weir body, thereby reducing the bias instability of the weir body.
The specific construction method of the embodiment is as follows:
1. when reservoir water storage is reduced to the minimum, dredging the bottom, excavating to be step-shaped, and synchronously constructing a first filling member 1-1, a second filling member 1-2 and a lower water facing surface slope protection 1-11 by adopting a filling method after completion, wherein the lower water facing surface slope protection 1-11 adopts a large stone slope protection, and is compacted by layered vibration rolling and filled to the top position of the lower filling member;
2. inserting and driving a tensile steel sheet pile 1-10 at the slope toe of the upper filling member 1-3, inserting the tensile steel sheet pile 1-10 into the position of a reservoir bottom covering layer 5m, and performing curtain grouting construction in the lower filling member on the back water surface side of the tensile steel sheet pile 1-10, and pouring plain concrete on the lower filling member to form a sealing layer 1-8;
3. after the lower filling member is settled, the upper filling member 1-3 is filled, the cushion layer 1-6, the transition layer 1-7, the composite geomembrane 1-5 and the upstream surface are constructed, the positions of the anti-flushing wall 5 and the water drop groove 6 are reserved, and then the anti-flushing wall and the water drop groove 6 are cast in situ synchronously with the water through tank culvert 4. Filling the water tank culvert 4 to the upper filling member 1-3, and constructing the water tank culvert 4 at the position penetrating through the water tank culvert 4, wherein the water tank culvert 4 is provided with a concave notch at the non-filling interface to ensure the filling and jogging with the periphery. And the construction of the water-passing box culvert 4 is carried out, meanwhile, the anti-impact wall 5 and the water drop groove 6 are cast in situ, and the construction of the working well 3 is synchronously carried out.
4. The working well 3 is of a square reinforced concrete structure, the cross-sectional area is wider than that of the intercepting drainage ditch 2, the three layers inside are vertically provided with a supporting sieve plate 3-1, and the fine aggregate layer 3-2, the coarse aggregate layer 3-3 and the fine aggregate layer 3-2 are sequentially arranged from top to bottom, so that the purposes of filtering water discharged from a reservoir, filtering high water level and preventing water source pollution are achieved.
5. Filling the rest upper filling members 1-3 after the construction of the water through tank culvert 4 is completed, arranging a clay sealing layer 4-2 on the outer ring of the concave notch to seal and protect clay, combining with the weir soil and stone, filling the upper filling members 1-3 with a cushion layer 1-6, a transition layer 1-7, a composite geomembrane 1-5 and a water facing surface protection surface synchronously, vibrating and rolling compactly, and then constructing a top sealing layer 1-8 of the upper filling members 1-3.
6. And (3) basically finishing the main body of the cofferdam body 1, and checking the water seepage condition of the cofferdam body 1 after the settlement is finished after construction. The last step of seepage prevention measures adopts the back surface slope protection 1-12 for covering, and the back surface slope protection 1-12 is mixed with clay and a silt curing agent in a specific proportion to be used as a waterproof layer, so that the waterproof layer has outstanding bonding, stabilizing and seepage prevention effects.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (10)
1. An impermeable cofferdam structure of reservoir, its characterized in that: the water intercepting and draining device is characterized by comprising a cofferdam body (1) arranged in a reservoir, a water intercepting and draining ditch (2) for intercepting runoffs on the reservoir is arranged on the reservoir bank of the reservoir, a working well (3) for filtering water in the water intercepting and draining ditch (2) is arranged at the outlet of the water intercepting and draining ditch (2), a water passing box culvert (4) penetrating through the cofferdam body (1) is arranged in the cofferdam body (1) at the position above the normal water level of the reservoir, and the water passing box culvert (4) is connected with the outlet of the working well (3).
2. An impermeable cofferdam structure for a reservoir as set forth in claim 1, wherein: the water-through box culvert (4) is externally provided with a clay seal layer (4-2) for enabling the water-through box culvert (4) to be fully embedded with the cofferdam body (1).
3. An impermeable cofferdam structure for a reservoir as set forth in claim 1, wherein: a filter body is arranged in the working well (3), and a bearing screen plate (3-1) is fixedly arranged in the working well (3) at the upper side and the lower side of the filter body;
the filter body is provided with a coarse aggregate layer (3-3) arranged in the working well (3), fine aggregate layers (3-2) are arranged in the working well (3) on the upper side and the lower side of the coarse aggregate layer (3-3), and a supporting screen plate (3-1) is arranged between the coarse aggregate layer (3-3) and the fine aggregate layer (3-2).
4. An impermeable cofferdam structure for a reservoir as set forth in claim 1, wherein: an anti-slip ridge (4-1) used for preventing water from penetrating into the cofferdam body (1) through a gap between the water box culvert (4) and the cofferdam body (1) is arranged on the slope of the cofferdam body (1) facing the reservoir at the position above the outlet of the water box culvert (4).
5. An impermeable cofferdam structure for a reservoir as set forth in claim 1, wherein: a drop chute (6) is arranged on the slope of the cofferdam body (1) facing the reservoir at the position below the outlet of the water box culvert (4).
6. An impermeable cofferdam structure for a reservoir as set forth in claim 1, wherein: an anti-flushing wall (5) for preventing water discharged from the water box culvert (4) from flushing the cofferdam body (1) is arranged on the slope of the cofferdam body (1) facing the reservoir at the position below the outlet of the water box culvert (4).
7. A cofferdam structure for use as a cofferdam in an impermeable cofferdam structure for a reservoir as set forth in any one of claims 1 to 6, characterized in that: the water-permeable box culvert is provided with a lower filling member arranged in a reservoir and an upper filling member (1-3) arranged on the lower filling member, wherein a water-permeable box culvert (4) is arranged in the upper filling member (1-3), the top surface of the lower filling member is higher than a low water level line of the reservoir, the top surface of the upper filling member (1-3) is higher than a high water level line of the reservoir, and an impermeable member is arranged in the lower filling member along the passing direction of the cofferdam body (1).
8. A cofferdam structure as set forth in claim 7, wherein: the impermeable member is provided with a tensile steel sheet pile (1-10) which is anchored into the reservoir bottom from the slope toe of the upper filling member (1-3), and a water-blocking curtain (1-9) is arranged in the lower filling member at one side of the tensile steel sheet pile (1-10) far away from the reservoir.
9. A cofferdam structure as set forth in claim 7, wherein: a lower water-facing surface slope protection (1-11) is arranged on a slope of the lower filling member facing the reservoir, an upper water-facing surface slope protection is arranged on a slope of the upper filling member (1-3) facing the reservoir, a water-facing surface slope protection (1-12) is arranged on a slope of the cofferdam body (1) far away from the reservoir, and sealing layers (1-8) are arranged on the top surfaces of the upper filling member (1-3) and the lower filling member;
the lower-layer upstream surface slope protection (1-11) is a large stone slope protection, the upper-layer upstream surface slope protection is provided with an upper-layer upstream surface slope protection (1-4), a transition layer (1-7), a cushion layer (1-6) and a composite geomembrane (1-5) which are paved on the slope surface of the upper filling member (1-3) in sequence, and the upstream surface slope protection (1-12) is a waterproof layer formed by mixing clay and a silt curing agent.
10. A cofferdam structure as set forth in claim 7, wherein: the lower filling member is provided with a first filling member (1-1) arranged in the reservoir towards one side of the reservoir and a second filling member (1-2) arranged in the reservoir away from one side of the reservoir;
the first filling member (1-1) is composed of earth and stone, the second filling member (1-2) is composed of fine stone slag, and the upper filling member (1-3) is composed of stone slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321614293.3U CN220202720U (en) | 2023-06-25 | 2023-06-25 | Seepage-proofing cofferdam structure and cofferdam structure of reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321614293.3U CN220202720U (en) | 2023-06-25 | 2023-06-25 | Seepage-proofing cofferdam structure and cofferdam structure of reservoir |
Publications (1)
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