CN214940281U - Compound cofferdam of steel reinforcement gabion and clay braided bag - Google Patents
Compound cofferdam of steel reinforcement gabion and clay braided bag Download PDFInfo
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- CN214940281U CN214940281U CN202022419695.0U CN202022419695U CN214940281U CN 214940281 U CN214940281 U CN 214940281U CN 202022419695 U CN202022419695 U CN 202022419695U CN 214940281 U CN214940281 U CN 214940281U
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Abstract
The utility model discloses a compound cofferdam of steel reinforcement gabion and clay braided bag, including outer cofferdam of steel reinforcement gabion and clay braided bag inlayer cofferdam, clay braided bag inlayer cofferdam is hugged closely the inboard in the outer cofferdam of steel reinforcement gabion, clay braided bag inlayer cofferdam with the junction in the outer cofferdam of steel reinforcement gabion is continuous echelonment. The composite cofferdam of the utility model has simple structure and convenient construction; the advantages of the earth-rock cofferdam and the concrete cofferdam are combined, and the key problems and requirements that the existing earth-rock cofferdam and the existing concrete cofferdam cannot well solve the problems that the river is turbulent, the environmental protection requirement is high, the flood discharge requirement is large, the existing earth-rock cofferdam is used as a temporary construction cofferdam, the existing earth-rock cofferdam is convenient to remove, and the like are solved.
Description
Technical Field
The utility model relates to a bridge engineering construction technical field specifically is a compound cofferdam of steel reinforcement gabion and clay braided bag.
Background
The cofferdam commonly used in engineering is generally an earth-rock cofferdam or a concrete cofferdam, and the earth-rock cofferdam is a cofferdam formed by constructing a weir with earth and rock. The earth-rock cofferdam can be combined with a closure dike, can utilize excavation to discard slag, can directly utilize main engineering excavation and shipping equipment to carry out mechanized rapid construction, and is the most widely applied cofferdam form in China. However, the earth-rock cofferdam has the defects of low anti-scouring capability and large floor area, limits the use scene to a certain extent, and is not suitable for engineering construction with rapid water flow, strict water blocking rate requirement and high environmental protection requirement. The concrete cofferdam is commonly used for hydro-junction engineering constructed on the foundation soil, and has the advantages of impact resistance, good seepage-proofing performance, small bottom width, easy combination with permanent buildings, safety, reliability and the like. But has high manufacturing cost and is not suitable for a temporary cofferdam structure.
SUMMERY OF THE UTILITY MODEL
In order to solve the defect that exists among the above-mentioned prior art, the utility model discloses combine the advantage in earth-rock cofferdam and concrete cofferdam, provide a steel reinforcement gabion and clay braided bag composite cofferdam structure, solve that river torrent is urgent, the environmental protection requires highly, the flood discharge demand is big, as temporary construction cofferdam, be convenient for demolish key problem and demand to and current earth-rock cofferdam and concrete cofferdam can not solve the not enough of above-mentioned problem well.
The utility model provides an adopted technical scheme of its technical problem does: the utility model provides a compound cofferdam of steel reinforcement gabion and clay braided bag, includes outer cofferdam of steel reinforcement gabion and clay braided bag inlayer cofferdam, clay braided bag inlayer cofferdam is hugged closely the inboard in the outer cofferdam of steel reinforcement gabion, clay braided bag inlayer cofferdam with the junction in the outer cofferdam of steel reinforcement gabion is continuous echelonment, clay braided bag inlayer cofferdam with the outer cofferdam of steel reinforcement gabion alternately carries out the layered construction. The clay woven bag inner cofferdam with better anti-seepage performance is filled in time and clings to the inner side of the outer cofferdam of the reinforced gabion to form a composite cofferdam together to play the roles of anti-seepage and water-proof; and the clay woven bag inner-layer cofferdam and the reinforced gabion outer-layer cofferdam determine the height extending upwards layer by layer and the range extending towards the inside of the cofferdam according to the gradient and the height of the cofferdam and the scouring protection requirement.
Further, still including the clay braided bag bank protection, the clay braided bag bank protection sign indicating number put in the top department in the outer cofferdam of reinforcing bar gabion plays the bank protection effect.
Further, the clay woven bag inner cofferdam construction method further comprises clay and stone mixed packing, wherein the clay and stone mixed packing is tightly attached to the inner side of the clay woven bag inner cofferdam, and the clay and stone mixed packing and the clay woven bag inner cofferdam are constructed in a layered mode at the same time.
Furthermore, the outer cofferdam of the steel reinforcement gabion and the inner cofferdam of the clay woven bag are respectively formed by stacking a plurality of layers of steel reinforcement gabion cofferdam units and clay woven bag units.
Furthermore, the steel reinforcement gabion cofferdam unit comprises a steel reinforcement framework and an inner filling material, wherein the steel reinforcement framework is in a cuboid shape, and the inner filling material is stacked in the steel reinforcement framework. The steel reinforcement cage is characterized in that the steel reinforcement cage framework is made of steel reinforcements with the same major diameter (namely the diameter is not smaller than phi 20mm) as phi 20, and the side face of the steel reinforcement cage framework is sealed by a screen made of steel reinforcements with the same smaller diameter (namely the diameter is not larger than phi 16mm) as phi 16.
Further, the steel bar skeleton has the size of a (m) multiplied by 1(m), wherein a is a constant; the vertical spacing of the reinforcing steel bars with the diameter phi of 20 and the like of the reinforcing steel bar framework is 1m, the horizontal spacing is 1m, and single-side welding is adopted for 10d, wherein d is the diameter of the reinforcing steel bar; the distance between reinforcing steel bar meshes with smaller diameters of phi 16 and the like is 0.1m in a bidirectional mode, the connection mode is welding, and the mesh performs bidirectional knot drawing on the steel bar framework; the filling material refers to scatterer materials such as rock blocks or gravel soil stacked in a cuboid reinforcement cage, and the filled scatterer materials can be determined according to protection requirements, reinforcement intervals of the reinforcement cage and the like, and are generally required to be not smaller than the size of reinforcement holes.
Further, the slope of compound cofferdam (be promptly the outside slope of outer cofferdam of steel reinforcement gabion) can be according to the size of a of steel reinforcement gabion and adjust in a flexible way, and the slope generally is 1: a/2, wherein a is the length of the reinforcement gabion.
The utility model also discloses a construction method of compound cofferdam of reinforcement gabion and clay braided bag, its step as follows:
s1, selecting a suitable steel bar framework in the steel bar gabion and clay woven bag composite cofferdam structure, wherein the steel bar framework comprises the size, the type of steel bars, the particle size of filling materials and the like.
And S2, determining the height, gradient and width of the suitable cofferdam.
S3, selecting a proper construction method, comprising the following steps: treating a cofferdam foundation before cofferdam construction, excavating bottom sludge, and replacing and filling with broken stones to ensure the bearing capacity of the bottom of the cofferdam; for the foundation part of the cofferdam below the water, as the water flow speed is higher, large blocks of 30-100cm stones are adopted to be matched with a gabion to fill the water surface, then the cofferdam is filled by using crushed rock, enough transport vehicles and construction machinery are equipped during filling, a specially-assigned person commands to ensure the construction safety, and the underwater part of the cofferdam is naturally compacted through self weight and a water compaction method.
S4, manufacturing a steel bar framework and filling a sand bag by a clay woven bag unit: the steel bar is used for manufacturing a steel bar cage framework and a steel bar manufacturing screen for sealing, the connection mode is welding, the screen performs bidirectional drawknot on the steel bar cage framework, block stones are stacked in the steel bar cage framework, and the screen is sealed to form the steel bar gabion cofferdam unit; sand pebbles or clay are selected and filled in the woven bag, the clay woven bag unit is formed by sealing, and the clay woven bag unit is stacked in order and stored in a material stacking area; and clay with better anti-permeability is filled closely to the inner side of the gabion in time. The compaction is carried out synchronously, and the strength and the stability of the weir are enhanced.
S5, stacking the steel bar gabion cofferdam units: and stacking the on-site manufactured reinforcement gabion cofferdam units as required, wherein the reinforcement gabion cofferdam units are in a T shape in a one-to-one staggered joint stacking mode, and the upper reinforcement gabion cofferdam unit inwards shrinks by a/2(m) layer by layer relative to the lower reinforcement gabion cofferdam unit to form a step type reinforcement gabion outer cofferdam. The same row of reinforced gabion cofferdam units are connected in series by phi 10 steel bars, each transverse reinforced gabion cofferdam is provided with phi 10 ground anchor zipper steel bars, one end of each transverse reinforced gabion cofferdam is firmly connected with the outer side of the reinforced gabion cofferdam unit, and the other end of each transverse reinforced gabion cofferdam is welded with a phi 25 anchor bar anchoring large stones (the diameter of each reinforced gabion cofferdam is larger than 1.2m) so as to enhance the overall stability of the reinforced gabion outer cofferdam and improve the anti-scouring capability of the whole reinforced gabion outer cofferdam.
S6, cofferdam filling: after the arrangement of the outer cofferdam of the reinforcement gabion is finished, filling gravel soil into gaps between the reinforcement gabion cofferdam units. And stacking the clay woven bag units on the inner side of the steel bar gabion cofferdam unit, and then reinforcing and waterproofing the cofferdam. The filling materials of the cofferdam are made of stones and earth and stones and are filled in layers, and the loose pavement thickness of the filling materials of each layer of the cofferdam is 50 cm. And filling 2 layers of cofferdam filling materials for the steel bar gabion cofferdam unit when the steel bar gabion cofferdam unit is installed for 1 layer. Leveling the paved filler along the side line of the cofferdam by adopting an excavator, rolling and compacting by adopting the excavator from outside to inside in the filling direction.
S7, clay woven bag slope protection construction: and clay woven bags are adopted at the 2m top of the cofferdam for slope protection, so that the erosion of river water to the cofferdam is reduced. The clay woven bag protection slope is constructed in a mode of sliding down the slope, the upper layer and the lower layer are required to be mutually staggered, and the clay woven bags are stacked as neatly as possible. The clay woven bags are sent to the top of the gabion cofferdam along the slope so as to avoid segregation and leakage. Soil (clay) with better impermeability is filled closely to the inner side of the clay woven bag in time. The vibration compaction is carried out synchronously, and the strength and the stability of the weir dam are enhanced.
Compared with the prior art, the utility model, the beneficial effects are that: the composite cofferdam of the utility model has simple structure and convenient construction; the advantages of the earth-rock cofferdam and the concrete cofferdam are combined, and the key problems and requirements that the existing earth-rock cofferdam and the existing concrete cofferdam cannot well solve the problems that the river is turbulent, the environmental protection requirement is high, the flood discharge requirement is large, the existing earth-rock cofferdam is used as a temporary construction cofferdam, the existing earth-rock cofferdam is convenient to remove, and the like are solved.
Drawings
FIG. 1 is a structural diagram of the composite cofferdam of the present invention;
FIG. 2 is a perspective view of the steel bar skeleton structure of the present invention;
fig. 3 is a schematic view of the single-layer structure of the inner cofferdam of the clay woven bag and the outer cofferdam of the reinforcement gabion of the utility model;
fig. 4 is a schematic view of a multilayer structure of the clay woven bag inner cofferdam and the reinforcement gabion outer cofferdam of the utility model;
FIG. 5 is a construction flow chart of the present invention;
fig. 6 is a schematic view of the construction engineering of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. In fig. 6, a is indicated as a river and B is indicated as a river bed.
As shown in fig. 1-4 and fig. 6, the steel reinforcement gabion and clay woven bag composite cofferdam comprises a steel reinforcement gabion outer cofferdam 1, a clay woven bag inner cofferdam 2, a clay woven bag revetment 3 and a soil-rock mixed filler 4. The outer cofferdam 1 of the reinforcement gabion is arranged on the outermost layer of the composite cofferdam and mainly plays a role in preventing water flow scouring and reducing environmental pollution. The clay woven bag inner cofferdam 2 is tightly attached to the inner side of the reinforcement gabion outer cofferdam 1 to play a role in seepage prevention and water separation, the joint of the clay woven bag inner cofferdam 2 and the reinforcement gabion outer cofferdam 1 is in a continuous ladder shape, and the clay woven bag inner cofferdam 2 and the reinforcement gabion outer cofferdam 1 are constructed in a crossed and layered mode. The clay woven bag inner cofferdam 2 and the steel bar gabion outer cofferdam 1 determine the height extending upwards layer by layer and the range extending towards the inside of the cofferdam according to the gradient and the height of the cofferdam and the scouring protection requirement. Clay woven sack bank protection 3 pile up in the top department of outer cofferdam 1 of steel reinforcement gabion plays the bank protection effect, soil and stone mixed filler 4 hugs closely the inboard in clay woven sack inlayer cofferdam 2, soil and stone mixed filler 4 with clay woven sack inlayer cofferdam 2 is in the same period of layering construction.
The outer cofferdam 1 of the reinforcement gabion and the inner cofferdam 2 of the clay woven bag are respectively formed by stacking a plurality of layers of reinforcement gabion cofferdam units (hereinafter, the reinforcement gabion can be referred to as a gabion) and clay woven bag units. The steel reinforcement gabion cofferdam unit comprises a steel reinforcement framework and an inner filling material, wherein the steel reinforcement framework is in a cuboid shape, and the inner filling material is stacked in the steel reinforcement framework. The steel reinforcement cage is characterized in that the steel reinforcement cage framework 11 is made of steel reinforcements with the diameter not smaller than phi 20mm, and the side faces of the steel reinforcement cage are sealed by a screen 12 made of steel reinforcements with the diameter not larger than phi 16 mm. As shown in fig. 2, the height and the width of the steel reinforcement framework are respectively 1m, a is the length of the reinforcement gabion and can be reasonably determined according to the gradient of the composite cofferdam, wherein a is a constant; the vertical spacing of the reinforcing steel bars with the diameter phi of 20 and the like of the reinforcing steel bar framework is 1m, the horizontal spacing is 1m, and single-side welding is adopted for 10d, wherein d is the diameter of the reinforcing steel bar; the distance between reinforcing steel bar meshes with smaller diameters of phi 16 and the like is 0.1m in a bidirectional mode, the connection mode is welding, and the mesh performs bidirectional knot drawing on the steel bar framework; the filling material refers to scatterer materials such as rock blocks or gravel soil stacked in a cuboid reinforcement cage, and the filled scatterer materials can be determined according to protection requirements, reinforcement intervals of the reinforcement cage and the like, and are generally required to be not smaller than the size of reinforcement holes.
As shown in fig. 3 and 4, be individual layer and multilayer steel reinforcement gabion cofferdam unit and clay woven sack unitized construction respectively, b is the width of clay woven sack unit, can rationally determine according to compound cofferdam thickness, and N is multilayer structure's the number of piles (also is the height), and a + b is the width in compound cofferdam, 1: a/2 is the gradient of the composite cofferdam, the gradient of the composite cofferdam (namely the gradient of the outer side of the cofferdam of the reinforcement gabion) can be flexibly adjusted according to the size a of the reinforcement gabion, and the gradient is generally 1: a/2, wherein a is the length of the reinforcement gabion. This embodiment is to rivers torrent, environmental protection requirement height, flood discharge demand big, as temporary construction cofferdam, the short temporary pier cofferdam of certain bridge of construction period and has carried out the construction scheme design, and its preferred scheme is: the height of the composite cofferdam part is 10m, the gradient is 1: 1, consequently reinforcing bar gabion size an is 2m, and the total number of piles of reinforcing bar gabion is 10 layers, and the partial width in clay woven bag cofferdam is 1m, and compound cofferdam total width is 3 m.
The utility model discloses still disclose a construction method of compound cofferdam of steel reinforcement gabion and clay braided bag, as shown in fig. 5, its flow can simply conclude to: leveling field → gabion making → foundation excavation → stacking a first layer of gabion → backfilling gravel soil and compacting → stacking a second layer of gabion → backfilling gravel soil and compacting → stacking an Nth layer of gabion → backfilling gravel soil and compacting → piling of sandbags, overall cofferdam reinforcement → foundation construction → cofferdam demolition.
Specifically, the construction method comprises the following steps:
s1, selecting a suitable steel bar framework in the steel bar gabion and clay woven bag composite cofferdam structure, wherein the steel bar framework comprises the size, the type of steel bars, the particle size of filling materials and the like.
And S2, determining the height, gradient and width of the suitable cofferdam.
S3, selecting a proper construction method, comprising the following steps: treating a cofferdam foundation before cofferdam construction, excavating bottom sludge, and replacing and filling with broken stones to ensure the bearing capacity of the bottom of the cofferdam; for the foundation part of the cofferdam below the water, as the water flow speed is higher, large blocks of 30-100cm stones are adopted to be matched with a gabion to fill the water surface, then the cofferdam is filled by using crushed rock, enough transport vehicles and construction machinery are equipped during filling, a specially-assigned person commands to ensure the construction safety, and the underwater part of the cofferdam is naturally compacted through self weight and a water compaction method.
S4, manufacturing a steel bar framework and filling a sand bag by a clay woven bag unit: the steel bar is used for manufacturing a steel bar cage framework and a steel bar manufacturing screen for sealing, the connection mode is welding, the screen performs bidirectional drawknot on the steel bar cage framework, block stones are stacked in the steel bar cage framework, and the screen is sealed to form the steel bar gabion cofferdam unit; sand pebbles or clay are selected and filled in the woven bag, the clay woven bag unit is formed by sealing, and the clay woven bag unit is stacked in order and stored in a material stacking area; and clay with better anti-permeability is filled closely to the inner side of the gabion in time. The compaction is carried out synchronously, and the strength and the stability of the weir are enhanced.
S5, stacking the steel bar gabion cofferdam units: and stacking the on-site manufactured reinforcement gabion cofferdam units as required, wherein the reinforcement gabion cofferdam units are in a T shape in a one-to-one staggered joint stacking mode, and the upper reinforcement gabion cofferdam unit inwards shrinks by a/2(m) layer by layer relative to the lower reinforcement gabion cofferdam unit to form a step type reinforcement gabion outer cofferdam. The same row of reinforced gabion cofferdam units are connected in series by phi 10 steel bars, each transverse reinforced gabion cofferdam is provided with phi 10 ground anchor zipper steel bars, one end of each transverse reinforced gabion cofferdam is firmly connected with the outer side of the reinforced gabion cofferdam unit, and the other end of each transverse reinforced gabion cofferdam is welded with a phi 25 anchor bar anchoring large stones (the diameter of each reinforced gabion cofferdam is larger than 1.2m) so as to enhance the overall stability of the reinforced gabion outer cofferdam and improve the anti-scouring capability of the whole reinforced gabion outer cofferdam.
S6, cofferdam filling: after the arrangement of the outer cofferdam of the reinforcement gabion is finished, filling gravel soil into gaps between the reinforcement gabion cofferdam units. And stacking the clay woven bag units on the inner side of the steel bar gabion cofferdam unit, and then reinforcing and waterproofing the cofferdam. The filling materials of the cofferdam are made of stones and earth and stones and are filled in layers, and the loose pavement thickness of the filling materials of each layer of the cofferdam is 50 cm. And filling 2 layers of cofferdam filling materials for the steel bar gabion cofferdam unit when the steel bar gabion cofferdam unit is installed for 1 layer. Leveling the paved filler along the side line of the cofferdam by adopting an excavator, rolling and compacting by adopting the excavator from outside to inside in the filling direction.
S7, clay woven bag slope protection construction: and clay woven bags are adopted at the 2m top of the cofferdam for slope protection, so that the erosion of river water to the cofferdam is reduced. The clay woven bag protection slope is constructed in a mode of sliding down the slope, the upper layer and the lower layer are required to be mutually staggered, and the clay woven bags are stacked as neatly as possible. The clay woven bags are sent to the top of the gabion cofferdam along the slope so as to avoid segregation and leakage. Soil (clay) with better impermeability is filled closely to the inner side of the clay woven bag in time. The vibration compaction is carried out synchronously, and the strength and the stability of the weir dam are enhanced.
The above mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the description of the present invention are still included in the scope covered by the present invention.
Claims (8)
1. The utility model provides a compound cofferdam of steel reinforcement gabion and clay braided bag, its characterized in that, includes outer cofferdam of steel reinforcement gabion and clay braided bag inlayer cofferdam, clay braided bag inlayer cofferdam is hugged closely the inboard in the outer cofferdam of steel reinforcement gabion, clay braided bag inlayer cofferdam with the junction in the outer cofferdam of steel reinforcement gabion is continuous echelonment.
2. The steel reinforcement gabion and clay woven bag composite cofferdam of claim 1, further comprising a clay woven bag revetment, wherein the clay woven bag revetment is stacked at the top of the steel reinforcement gabion outer cofferdam.
3. The steel reinforcement gabion and clay woven bag composite cofferdam of claim 1, further comprising earth and stone mixed filler, wherein the earth and stone mixed filler is closely attached to the inner side of the clay woven bag inner cofferdam.
4. The steel reinforcement gabion and clay woven bag composite cofferdam of claim 1, wherein said steel reinforcement gabion outer cofferdam and said clay woven bag inner cofferdam are respectively composed of a plurality of layers of steel reinforcement gabion cofferdam units and clay woven bag units piled up.
5. The steel reinforcement gabion and clay woven bag composite cofferdam of claim 4, wherein the steel reinforcement gabion cofferdam unit comprises a steel reinforcement cage and an inner filling material, the steel reinforcement cage is in a rectangular parallelepiped shape, and the inner filling material is stacked in the steel reinforcement cage.
6. The composite cofferdam of steel reinforcement gabion and clay woven bag according to claim 5, characterized in that the steel reinforcement cage skeleton is made of steel reinforcement with diameter not less than Φ 20mm, the side of the steel reinforcement cage skeleton is closed by a screen made of steel reinforcement with diameter not more than Φ 16mm, and the screen ties the steel reinforcement cage in two directions.
7. The steel reinforcement gabion and clay woven bag composite cofferdam of claim 5, wherein the steel reinforcement cage has a dimension of a m x 1 m; the outer side slope of the outer cofferdam of the reinforced gabion is 1: a/2, wherein a is a constant.
8. The steel reinforcement gabion and clay woven bag composite cofferdam of any one of claims 5 to 7, wherein the inner filling material is rock block or crushed soil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022419695.0U CN214940281U (en) | 2020-10-27 | 2020-10-27 | Compound cofferdam of steel reinforcement gabion and clay braided bag |
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| CN202022419695.0U CN214940281U (en) | 2020-10-27 | 2020-10-27 | Compound cofferdam of steel reinforcement gabion and clay braided bag |
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