CN212506341U - Cofferdam group structure with broken line type earth-rock cofferdam - Google Patents
Cofferdam group structure with broken line type earth-rock cofferdam Download PDFInfo
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- CN212506341U CN212506341U CN202020617602.2U CN202020617602U CN212506341U CN 212506341 U CN212506341 U CN 212506341U CN 202020617602 U CN202020617602 U CN 202020617602U CN 212506341 U CN212506341 U CN 212506341U
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Abstract
The utility model provides a cofferdam crowd structure with broken line formula embankment cofferdam, utilize earlier built embankment sub-weir effectively, the horizontal partial weir body of upper and lower reaches embankment cofferdam combines to arrange with sub-cofferdam, the length of upper and lower reaches embankment cofferdam has been reduced, because the horizontal partial weir body of upper and lower reaches embankment cofferdam combines with sub-cofferdam, can not consider upper and lower reaches embankment cofferdam to account for the part that occupies during sub-cofferdam arrangement, the corresponding reducible longitudinal segment length of sub-cofferdam, and is same, the length of longitudinal concrete cofferdam also can shorten, because the length of upper and lower reaches cofferdam, sub-cofferdam, longitudinal concrete cofferdam all effectively shortens, construction cycle has been reduced, construction progress has been accelerated; the tooth socket structure is arranged at the intersection of the upstream and downstream earth-rock cofferdam seepage-proofing systems and the longitudinal concrete cofferdam, so that the seepage-proofing effect can be effectively ensured.
Description
Technical Field
The utility model belongs to the technical field of water conservancy water and electricity, especially, relate to a cofferdam crowd structure with broken line formula earth-rock cofferdam.
Background
The staged diversion is a commonly used construction diversion mode in water conservancy and hydropower engineering, a longitudinal cofferdam is usually required to be newly built under the condition of no utilization of a natural river core island, the longitudinal cofferdam in a river with large flow and high flow speed is usually of a concrete structure type, and a sub-cofferdam is required to be newly built for newly building the longitudinal cofferdam, so that a diversion building generally comprises the longitudinal cofferdam, an upstream cofferdam and a downstream cofferdam, and the sub-cofferdam built for newly building the longitudinal concrete cofferdam.
The cofferdam in the prior art has the following problems in the aspects of arrangement, structure and construction period:
(1) in the prior art, a sub-cofferdam is built firstly, after the sub-cofferdam is built, a longitudinal concrete cofferdam, an upstream cofferdam and a downstream cofferdam are built, and the upstream cofferdam, the downstream cofferdam and the sub-cofferdam are arranged separately;
(2) under the condition that the required foundation pit is the same in size, the occupation positions of an upstream cofferdam and a downstream cofferdam need to be considered for the size of the foundation pit of the sub cofferdam, and the foundation pit is large, so that the length of both a longitudinal section of the sub cofferdam and a longitudinal concrete cofferdam needs to be increased;
(3) the problem of high-flow-rate scouring of the upstream cofferdam and the downstream cofferdam close to the riverbed section is solved, the length of the longitudinal concrete cofferdams at two ends is prolonged to protect the longitudinal concrete cofferdams, and the length of the longitudinal concrete cofferdams is increased.
(4) The cofferdam construction is generally required to be completed in a dry period, and the construction period is short.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cofferdam crowd structure with broken line formula earth-rock cofferdam to the not enough of existence among the prior art.
To this end, the above object of the present invention is achieved by the following technical solutions:
the utility model provides a cofferdam crowd structure with broken line formula earth-rock cofferdam which characterized in that: the cofferdam group structure with the broken line type earth-rock cofferdam comprises a sub cofferdam, a longitudinal concrete cofferdam, an upstream cofferdam and a downstream cofferdam; the sub-cofferdams comprise upstream transverse sections of the sub-cofferdams, longitudinal sections of the sub-cofferdams and downstream transverse sections of the sub-cofferdams, the longitudinal concrete cofferdams comprise upstream end sections of the longitudinal concrete cofferdams, water retaining sections of the longitudinal concrete cofferdams and downstream end sections of the longitudinal concrete cofferdams, the upstream cofferdams comprise upstream transverse sections of the upstream cofferdams and upstream cofferdam break sections, and the downstream cofferdams comprise downstream transverse sections of the downstream cofferdams and downstream cofferdam break sections; the upstream transverse section of the sub cofferdam and the upstream transverse section of the upstream cofferdam are of an integral structure, the integral structure and the upstream cofferdam broken line section form Y-shaped arrangement, the downstream transverse section of the sub cofferdam and the downstream cofferdam transverse section are of an integral structure, and the integral structure and the downstream cofferdam broken line section form Y-shaped arrangement; the sub cofferdam, the upstream cofferdam and the downstream cofferdam comprise cofferdam and weir body filling materials and plastic concrete impervious walls arranged in the cofferdam and weir body filling materials; the longitudinal concrete cofferdam water retaining section is connected with the upstream cofferdam broken line section and the downstream cofferdam broken line section, the longitudinal concrete cofferdam water retaining section, the upstream cofferdam and the downstream cofferdam are used as water retaining structures, and the upstream end section of the longitudinal concrete cofferdam and the downstream end section of the longitudinal concrete cofferdam are used as non-water retaining structures.
When adopting above-mentioned technical scheme, the utility model discloses can also adopt or make up and adopt following further technical scheme:
as the utility model discloses a preferred technical scheme: when the sub-cofferdams are dismantled, an upstream cofferdam wrapping head and a downstream cofferdam wrapping head are reserved on the upstream transverse section of the upstream cofferdam and the downstream transverse section of the downstream cofferdam respectively.
As the utility model discloses a preferred technical scheme: tooth sockets are respectively arranged at the lap joints of the longitudinal concrete cofferdam water retaining section and the upstream cofferdam broken line section and the downstream cofferdam broken line section, and plastic concrete impervious walls in the upstream cofferdam broken line section and the downstream cofferdam broken line section are inserted into the tooth sockets to form a tooth socket impervious structure.
As the utility model discloses a preferred technical scheme: the upstream end section of the longitudinal concrete cofferdam adopts a step-shaped layer-by-layer descending structure, the elevation of any position of the upstream end section of the longitudinal concrete cofferdam is not less than 1m higher than the elevation of the slope where the broken line section of the upstream cofferdam is located, and the length of the end of the longitudinal concrete cofferdam is not less than 20m longer than the foot length of the upstream filling slope of the broken line section of the upstream cofferdam.
As the utility model discloses a preferred technical scheme: the downstream end section of the longitudinal concrete cofferdam adopts a step-shaped layer-by-layer descending structure, the elevation of any position of the downstream end section of the longitudinal concrete cofferdam is not less than 1m higher than the elevation of the slope of the broken line section of the downstream cofferdam, and the length of the end of the longitudinal concrete cofferdam is not less than 20m longer than the foot length of the downstream filling slope of the broken line section of the downstream cofferdam.
As the utility model discloses a preferred technical scheme: and the tops of the upstream transverse section of the upstream cofferdam and the downstream transverse section of the downstream cofferdam are provided with heightening sub-weirs.
The utility model provides a cofferdam crowd structure with broken line formula embankment cofferdam, utilize earlier built embankment sub-weir effectively, the horizontal partial weir body of upper and lower reaches embankment cofferdam combines to arrange with sub-cofferdam, the length of upper and lower reaches embankment cofferdam has been reduced, because the horizontal partial weir body of upper and lower reaches embankment cofferdam combines with sub-cofferdam, can not consider upper and lower reaches embankment cofferdam to account for the part that occupies during sub-cofferdam arrangement, the corresponding reducible longitudinal segment length of sub-cofferdam, and is same, the length of longitudinal concrete cofferdam also can shorten, because the length of upper and lower reaches cofferdam, sub-cofferdam, longitudinal concrete cofferdam all effectively shortens, construction cycle has been reduced, construction progress has been accelerated; the tooth socket structure is arranged at the intersection of the upstream and downstream earth-rock cofferdam seepage-proofing systems and the longitudinal concrete cofferdam, so that the seepage-proofing effect can be effectively ensured; the upstream and downstream earth-rock cofferdams are directly scoured by water flow, particularly the broken line sections are more easily scoured and damaged by the water flow, and the wrapping heads are arranged at the end heads of the combined sections of the upstream and downstream earth-rock cofferdams and the sub-cofferdams, so that the water flow state of the broken line sections can be effectively improved, and the scouring and damage of the water flow to the cofferdams are improved; the length of the two ends of the longitudinal concrete cofferdam at the position needs to be slightly longer than the filling range of the upstream and downstream earth-rock cofferdams in arrangement, so that the upstream and downstream earth-rock cofferdams are protected from being damaged by water flow scouring; the head sections at the two ends of the longitudinal concrete cofferdam are of non-water retaining structures, and the top elevation of the longitudinal concrete cofferdam can be reduced in a step manner along with the reduction of the elevation of the hard water slope surface of the cofferdam so as to save the engineering amount of concrete.
Drawings
Fig. 1 is a plan layout view of a cofferdam group structure before the removal of the sub-cofferdams.
Fig. 2 is a plan layout view of a cofferdam group structure after the sub-cofferdams are removed.
Fig. 3 is a sectional view of a broken line segment of the upstream cofferdam or the downstream cofferdam.
Fig. 4 is a cross-sectional view of an upstream transverse section of an upstream weir or a downstream transverse section of a downstream weir.
Fig. 5 is a cross-sectional view at the wrap end.
FIG. 6 is a plan view of the gullets.
Fig. 7 is a layout view of an upstream end section of a longitudinal concrete cofferdam.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a broken line formula terrazzo overflow cofferdam and concrete cofferdam crowd mainly is applicable to the water conservancy and hydropower engineering in need newly-built vertical concrete cofferdam's stage water conservancy diversion engineering.
The cofferdam group comprises a sub-cofferdam structure, a longitudinal concrete cofferdam and an upstream cofferdam and a downstream cofferdam; the sub cofferdam comprises an upstream transverse section 1-1, a longitudinal section 1-2 and a downstream transverse section 1-3; the upstream cofferdam comprises an upstream transverse section 2-1 and a broken line section 2-2; the downstream cofferdam comprises a downstream transverse section 3-1 and a broken line section 3-2; the longitudinal concrete cofferdam is divided into an upstream end head section 4-1, a water retaining section 4-2 and a downstream end head section 4-3;
the construction procedure of the cofferdam group comprises the steps of constructing 1-1, 1-2 and 1-3 sub cofferdams, 2-1 upstream horizontal sections of upstream cofferdams and 3-1 downstream horizontal sections of downstream cofferdams in the first step, constructing 4-1, 4-2 and 4-3 longitudinal concrete cofferdams in the second step, constructing 2-2 broken sections of upstream cofferdams and 3-2 broken sections of downstream cofferdams in the third step, dismantling 1-2 longitudinal sections of sub cofferdams in the fourth step, and constructing a wrapping head 8 or 9 in the fifth step;
the transverse section 2-1 of the upstream cofferdam and the transverse section 1-1 of the sub cofferdam are combined and arranged, and because the water retaining flow of the sub cofferdam is generally smaller than that of the upstream cofferdam, the elevation of the sub cofferdam is lower than that of the upstream cofferdam, and a later-stage mode of heightening the sub cofferdam 17 can be adopted; the horizontal section 3-1 of the downstream cofferdam and the horizontal section 1-3 of the sub cofferdam are combined and arranged, because the water retaining flow of the sub cofferdam is generally smaller than that of the upstream cofferdam, the elevation of the sub cofferdam is lower than that of the downstream cofferdam, and a later-stage mode of heightening the sub cofferdam 17 can be adopted;
the upper and lower ends 4-1, 4-3 of the longitudinal concrete cofferdam are non-water retaining structures, which are used for protecting the broken line sections 2-2, 3-2 of the upper and lower cofferdams, the elevation of which can be lowered step by step, and generally any elevation of which is required to be not less than 1m higher than the water-facing slope of the broken line section 2-2 (3-2) of the upper and lower cofferdams; the extension length (compared with the toe of the broken line sections 2-2 and 3-2 of the upstream and downstream cofferdams) of the upstream and downstream ends 4-1 and 4-3 of the longitudinal concrete cofferdam is generally required to be not less than 20 m;
the upper cofferdam broken line segment 2-2 is branched from the upper transverse segment 1-1 of the sub cofferdam, and the plastic concrete impervious wall cross segment 5 is arranged in a Y shape; it should be noted that when the construction is carried out, the filling of the horizontal section 1-1 at the upstream of the sub cofferdam and the filling of the stone slag 14 at the longitudinal section 1-2 of the sub cofferdam are firstly completed, and the broken line section 2-2 of the upstream cofferdam needs to be simultaneously filled for one section (which can meet the construction requirement of the impervious wall of one groove section), the groove digging of the plastic concrete impervious wall needs to be simultaneously completed at the position, and then the concrete pouring is simultaneously carried out to form a whole body, so that the impervious requirement is met;
the lower cofferdam broken line segment 3-2 is branched from the lower horizontal segment 1-3 of the sub cofferdam, and the cross segment 6 of the plastic concrete impervious wall is arranged in a Y shape; it should be noted that when the construction is carried out, the filling of the horizontal section 1-3 of the downstream of the sub cofferdam and the filling of the stone slag 14 of the longitudinal section 1-2 of the sub cofferdam are firstly completed, and the broken line section 3-2 of the downstream cofferdam needs to be simultaneously filled for one section (which can meet the construction requirement of the impervious wall of one groove section), the groove digging of the plastic concrete impervious wall needs to be simultaneously completed at the position, and then the concrete pouring is simultaneously carried out to form a whole body, so that the impervious requirement is met;
a plastic concrete impervious wall tooth groove structure 10 is arranged at the lap joint of the longitudinal concrete cofferdam water retaining section 4-2 and the upstream cofferdam broken line section 2-2, the structure and the plastic concrete impervious wall 7 of the upstream cofferdam broken line section 2-2 are on the same axis, the plastic concrete impervious wall 7 is inserted into the tooth groove structure 10, the seepage-proofing effect of the lap joint of a seepage-proofing system is ensured, and the concrete structure of the tooth groove structure 10 refers to a tooth groove 19 in fig. 6;
a plastic concrete impervious wall tooth groove structure 11 is arranged at the lap joint of the longitudinal concrete cofferdam water retaining section 4-2 and the downstream cofferdam broken line section 3-2, the structure and the plastic concrete impervious wall 7 of the downstream cofferdam broken line section 3-2 are on the same axis, the plastic concrete impervious wall 7 is inserted into the tooth groove structure 11, the seepage-proofing effect of the lap joint of a seepage-proofing system is ensured, and the concrete structure of the tooth groove structure 11 refers to a tooth groove 19 in fig. 6;
the wrapping heads 8 and 9 are used for protecting the upstream and downstream cofferdam broken line sections 2-2 and 3-2 against or relieving the scouring damage of water flow to the upstream and downstream cofferdam broken line sections, the upstream and downstream cofferdam broken line sections are subjected to the unfavorable scouring of the water flow, the scouring at the position is mainly protected, the selection can be specifically carried out according to the flow state and the flow rate, the wrapping head section protective material 18 with dry construction conditions above the water surface with large flow state flow rate can be cast in a concrete panel mode, large stones, alloy cage net bags and other modes can be cast underwater, and large stones and steel reinforcement cages can be cast for small flow rate;
under the protection of the wrapping head, the water flow scouring of the upstream and downstream cofferdam broken line sections 2-2 and 3-2 upstream faces by water flow can be relieved, the protection measures can be weakened appropriately, the upstream face protection material 12 can adopt protection types such as boulders, steel reinforcement gabions and the like according to the specific flow state flow velocity condition, and the backside face protection material 13 adopts stone building protection;
generally, the transverse sections 2-1 and 2-3 of the upstream cofferdam and the downstream cofferdam are positioned at bank slope sections, the flow state of water flow at the bank slope sections is better, the flow rate is lower, the water scouring is relatively weaker, the upstream surface protective material 15 generally adopts a block stone protective type, and the back surface protective material 16 adopts stone protection.
The above detailed description is provided for explaining the present invention, and is only a preferred embodiment of the present invention, but not for limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made by the present invention are within the scope of the present invention.
Claims (6)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020617602.2U CN212506341U (en) | 2020-04-22 | 2020-04-22 | Cofferdam group structure with broken line type earth-rock cofferdam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020617602.2U CN212506341U (en) | 2020-04-22 | 2020-04-22 | Cofferdam group structure with broken line type earth-rock cofferdam |
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| CN212506341U true CN212506341U (en) | 2021-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529761A (en) * | 2020-04-22 | 2021-10-22 | 中国电建集团华东勘测设计研究院有限公司 | Cofferdam group structure and construction method with broken-line earth-rock cofferdam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529761A (en) * | 2020-04-22 | 2021-10-22 | 中国电建集团华东勘测设计研究院有限公司 | Cofferdam group structure and construction method with broken-line earth-rock cofferdam |
| CN113529761B (en) * | 2020-04-22 | 2023-08-18 | 中国电建集团华东勘测设计研究院有限公司 | A cofferdam group structure and construction method with broken line earth-rock cofferdam |
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