CN101368389B - Single and double-wall combined steel cofferdam construction method and its single and double-wall combined steel cofferdam - Google Patents
Single and double-wall combined steel cofferdam construction method and its single and double-wall combined steel cofferdam Download PDFInfo
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- CN101368389B CN101368389B CN2008101072251A CN200810107225A CN101368389B CN 101368389 B CN101368389 B CN 101368389B CN 2008101072251 A CN2008101072251 A CN 2008101072251A CN 200810107225 A CN200810107225 A CN 200810107225A CN 101368389 B CN101368389 B CN 101368389B
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Abstract
The invention discloses a single-wall and double-wall combined steel cofferdam construction method and a single-wall and double-wall combined steel cofferdam. The single-wall and double-wall combinedsteel cofferdam construction method includes the following steps: firstly, assembling the bottom segment side plate of the cofferdam at an assembly field; then floating to the position of a pier; after that, injecting concrete into the foot blade and assembling the top segment of cofferdam and the top segment inclined strut; then positioning, cleaning up the pedestal, building a boring platform, installing a steel casing and stacking the sandbags sequentially; after that, injecting bottom seal concrete, and boring the pier for injection; finally, after the pier pedestal is constructed, pumpingthe water, cutting off the steel casing, chiseling off the laitance at the head of the pier and beginning the construction of a bearing board. The bottom segment side plate of the cofferdam is composed of circular external and internal wall panels, and the top segment side plate of the cofferdam is fixed on the circular external wall panel. The invention has the advantages of fast engineering speed, small construction difficulty and small cost investment; the top segment side plate can be used repeatedly and is high in recovery rate; the invention overcomes the difficulties at the time of nobottoming concrete thickness; the circular sealing concrete between the bearing board and the cofferdam also has the effect of resisting water.
Description
Technical field
The present invention relates to the bridge job practices, especially relate to a kind of at the single and double-wall combined steel cofferdam construction method and the single and double-wall combined steel cofferdam thereof that do not have to utilize pile sandbag and circle envelope way to carry out the bridge engineering construction under the back cover thickness situation of cofferdam.
Background technology
Along with China's rapid economic development, the construction of traffic infrastructure also obtains fast development, and meanwhile the bridge of building on China's rivers lake surface also increases thereupon.As everyone knows, construct a bridge and at first will in water, build bridge pier, build bridge pier and then will in water, adopt the cofferdam that water is wherein drained and could construct.
The cofferdam is as the temporory structure of bridge foundation construction, it mainly acts on is to prop up as the excavation protection of foundation construction water proof device or deep foundation ditch in the water to keep off, so as under anhydrous, safety condition, to carry out assembling reinforcement, template is installed and pouring concrete construction, the cofferdam also can be used as the job platform of pile foundation construction.
When geological conditions is also uncomplicated, generally, main steel sheet-pile cofferdam and the double-walled steel cofferdam of adopting constructed, but for the covering layer in those riverbeds, pier position down for absolute altitude and scar absolute altitude at the bottom of weak wind slap, the cushion cap substantially near the time, owing to do not have covering layer substantially, be unfavorable for that inserting of steel sheet pile beaten and fixing, the employing steel sheet-pile cofferdam is constructed, steel sheet-pile cofferdam can not back cover, has no idea to block water; Because cofferdam construction is in dry season, water level is lower, adopts the double-walled steel cofferdam to compare waste material again fully, considers that from economic aspect the double-walled steel cofferdam is not to be well suited for.
Summary of the invention
First purpose of the present invention be to provide a kind of under the covering layer in riverbed, pier position for absolute altitude at the bottom of weak wind slap, the cushion cap and scar absolute altitude substantially near the time programming is fast, difficulty of construction is little, the cost input is less single and double-wall combined steel cofferdam construction method.
Second purpose of the present invention is to provide the recyclable utilization in a kind of epimerite side plate cofferdam, the higher single and double-wall combined steel cofferdam of the rate of recovery.
First purpose of the present invention is achieved in that
A kind of single and double-wall combined steel cofferdam construction method, feature is:
A, after factory completes the coxopodite side plate cofferdam of single and double-wall combined steel cofferdam and epimerite side plate cofferdam piecemeal, be transported to smooth assembly unit place, beach place, bank by the sidewalk of going to river and carry out the assembly unit of coxopodite side plate cofferdam part, the requirement of going to river in coxopodite side plate cofferdam should be considered in the position in the assembly unit place in coxopodite side plate cofferdam, to be convenient to go to river in the position in assembly unit place, according to on-site actual situations, transportation by driving when the employing higher level is gone to river in coxopodite side plate cofferdam, when assembly unit coxopodite side plate cofferdam, isolate with water blockoff dam and river course, after the cofferdam assembly unit of coxopodite side plate is good, excavate the water blockoff dam, river is entered, coxopodite side plate cofferdam just can be floated, and utilizes tugboat to haul out assembly unit place transportation by driving to the pier position;
After going to river in B, coxopodite side plate cofferdam, by the method perfusion sword pin inner concrete of doing place's routine work, increase the weight in coxopodite side plate cofferdam, coxopodite side plate cofferdam is sunk, draft is deepened; Begin assembly unit epimerite side plate cofferdam and epimerite diagonal brace then; Single and double-wall combined steel cofferdam connects height finish after, welding double-wall cofferdam end face cover plate, and weld two and draw water and use steel pipe is used to regulate single and double-wall combined steel cofferdam and sinks and accurately locate;
C, utilize station keeping ship that single and double-wall combined steel cofferdam is located: welding stop limits single and double-wall combined steel cofferdam plan-position on station keeping ship, vertically removable; Primary Location is carried out in sinkings of pouring water in the double-walled that the exterior panel in coxopodite side plate cofferdam 1 and inside panel constitute earlier, accurately locatees again, and pouring water after treating accurately to locate sinks down into the riverbed again;
D, basic clearly: clear up with the air suction dredge earlier to carrying out in the single and double-wall combined steel cofferdam, silt particle on the scar is cleaned out, sent water inspection under the diver after finishing, the affirmation substrate is cleaned out, so that make bottom concrete and scar knot and good, reach the purpose of sealing; Set up drilling platform at the top of single and double-wall combined steel cofferdam then, the steel casing is installed;
E, in the beginning of the 0.7m place of the inside panel of distance single and double-wall combined steel cofferdam to the high sandbag of center range pile, notice during pile that sandbag must not invade in the sword pin scope, send the diver to be lowered to water-bed pile all around; Beyond the sandbag and sword underfooting side, adopt conduit underwater grouting bottom concrete then, treat that concrete reaches 90% design strength after, rigging up carries out Bored Pile Construction on drilling platform;
After F, pile foundation construction are finished,, carry out drawing water in the single and double-wall combined steel cofferdam, cut off the steel casing, cut the pile crown laitance, carry out the construction of cushion cap at the top of single and double-wall combined steel cofferdam ballast.
Second purpose of the present invention is achieved in that a kind of single and double-wall combined steel cofferdam that is used for single and double-wall combined steel cofferdam construction method, to be coxopodite side plate cofferdam be made of the exterior panel and the inside panel of annular feature, horizontal support ring flat-plate and coxopodite that the reinforcing rib effect has been installed at exterior panel and inside panel vertically support angle steel, be linked to be integral body with horizontal diagonal brace angle steel between the horizontal support ring flat-plate, on the exterior panel of annular, be fixed with the epimerite side plate cofferdam that is single-wall structure, the epimerite that has been fixed with the reinforcing rib effect between epimerite side plate cofferdam and exterior panel vertically supports angle steel, and the inwall in epimerite side plate cofferdam is provided with horizontal cross rib of upper two layers and the horizontal cross rib of lower two layers.
In epimerite side plate cofferdam, place, four angles of the horizontal cross rib of lower two layers is provided with two-layer epimerite diagonal brace, and the epimerite diagonal brace adopts I32.
Be provided with between the inside panel in coxopodite side plate cofferdam in the two-layer coxopodite and support, support in every layer of coxopodite and adopt single I32.
The thick panel of 6mm is adopted in epimerite side plate cofferdam, the vertical spacing d of the horizontal cross rib of adjacent two layers is 1000mm, the horizontal cross rib of lower two layers adopts 400 * 10/200 * 12 " T " word combining structures of forming, and the horizontal cross rib of upper two layers adopts 350 * 10/200 * 12 " T " word combining structures of forming.
Spacing between exterior panel and the inside panel is 1000mm, and exterior panel and inside panel all adopt the thick panel of 6mm; The horizontal support ring flat-plate is 160 * 10mm, and laterally the diagonal brace angle steel is ∠ 63 * 63 * 6 angle steel, and the vertical spacing between the horizontal support ring flat-plate is 1000mm; It is ∠ 63 * 40 * 6 angle steel that coxopodite vertically supports angle steel, and level interval is 450mm.
The present invention is owing to set up epimerite side plate cofferdam on the basis of traditional double wall steel cofferdam, and vertically support angle steel and four layers of horizontal cross rib are reinforced by epimerite, thereby organically single double-walled steel cofferdam is organically combined, thereby approaching substantially at absolute altitude at the bottom of the cushion cap and scar absolute altitude, do not have in back cover the thickness this specific engineering geology and construction environment, select single double-walled in conjunction with the cofferdam, and it is very favourable adopting and enclosing the water of blockading, the present invention has following advantage: 1, programming is fast, and difficulty of construction is little; 2, the cost input is less, and epimerite side plate cofferdam can be used, and the rate of recovery is also higher, can reach 35%; 3, overcome the difficulty that does not have back cover thickness to bring, the circle sealing concrete between cushion cap and cofferdam can arrive the effect that blocks water equally.
Description of drawings
Fig. 1 is the structural representation of single and double-wall combined steel cofferdam of the present invention;
Fig. 2 be among Fig. 1 A-A to cross-sectional schematic;
Fig. 3 be among Fig. 1 B-B to cross-sectional schematic;
Fig. 4 looks schematic diagram for the right side of Fig. 1.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail.
A kind of single and double-wall combined steel cofferdam construction method:
A, after factory completes the coxopodite side plate cofferdam 1 of single and double-wall combined steel cofferdam and epimerite side plate cofferdam 7 piecemeals, be transported to smooth assembly unit place, beach place, bank by the sidewalk of going to river and carry out the assembly unit of coxopodite side plate cofferdam 1 part, the requirement of going to river in coxopodite side plate cofferdam 1 should be considered in the position in the assembly unit place in coxopodite side plate cofferdam 1, to be convenient to go to river in the position in assembly unit place, according to on-site actual situations, coxopodite side plate cofferdam 1 transportation by driving when adopting higher level (absolute altitude is that 25.5m is following so that can be with emersion assembly unit place, cofferdam when water level elevation 27.0m at the bottom of the place) of going to river, when assembly unit coxopodite side plate cofferdam 1, isolate with water blockoff dam and river course, after 1 assembly unit of coxopodite side plate cofferdam is good, excavate the water blockoff dam, river is entered, coxopodite side plate cofferdam 1 just can be floated, utilizing tugboat to haul out assembly unit place transportation by driving (annotates: auxilliary bridge 1 to the pier position, riverbed, 2# pier pier position covering layer is weak wind slap down, its end face absolute altitude is between 20.31～21.79m, and absolute altitude is+21.72 at the bottom of the cushion cap, so the cofferdam does not have back cover thickness substantially);
After going to river in B, coxopodite side plate cofferdam 1, when not adding other loads, draft is 1.2m, and 1.8m surfaces, by C20 concrete in the method perfusion sword pin 13 of doing place's routine work, increase the weight in coxopodite side plate cofferdam, coxopodite side plate cofferdam is sunk, draft is deepened, be that influx height is 1.0m, concrete perfusion weight is about 38t, and coxopodite side plate cofferdam adds sword pin concrete gross weight and is about 59t at this moment, and coxopodite side plate cofferdam draft this moment is about 2.0m; Begin assembly unit epimerite side plate cofferdam and epimerite diagonal brace then, note answering symmetrical assembly unit during assembly unit; Single and double-wall combined steel cofferdam connects height finish after, the cofferdam adds sword pin concrete gross weight and is about 77t, cofferdam draft this moment is 2.7m, surface and be about 0.3m in coxopodite side plate cofferdam, welding double-wall cofferdam end face cover plate, and weld 2 and draw water and use steel pipe, be used to regulate that single and double-wall combined steel cofferdam sinks and accurate location;
C, utilize station keeping ship that single and double-wall combined steel cofferdam is located: welding stop limits single and double-wall combined steel cofferdam plan-position on station keeping ship, vertically removable; The sinking of in the double-walled that the exterior panel 2 in coxopodite side plate cofferdam 1 and inside panel 3 constitute, pouring water, carry out Primary Location earlier, just the end absolute altitude on single and double-wall combined steel cofferdam weir is controlled at apart from about the riverbed 0.5m during location, accurately locatees again, treats accurately to pour water behind the location to sink down into the riverbed again;
D, basic clearly: clear up with the air suction dredge earlier to carrying out in the single and double-wall combined steel cofferdam, silt particle on the scar is cleaned out, sent water inspection under the diver after finishing, the affirmation substrate is cleaned out, so that make bottom concrete and scar knot and good, reach the purpose of sealing; Set up drilling platform at the top of single and double-wall combined steel cofferdam then, diameter 2.6m steel casing is installed;
E, in the beginning of the 0.7m place of the inside panel 3 of distance single and double-wall combined steel cofferdam to the high sandbag of center range pile 1m, notice during pile that sandbag must not invade in sword pin 13 scopes, send the diver to be lowered to water-bed pile all around; Beyond the sandbag and below the sword pin 13, adopt the high C20 bottom concrete of conduit underwater grouting 1m then, treat that concrete reaches 90% design strength after, rigging up carries out Bored Pile Construction on drilling platform;
After F, pile foundation construction are finished,, carry out drawing water in the single and double-wall combined steel cofferdam, cut off the steel casing, cut the pile crown laitance, carry out the construction of cushion cap at the top of single and double-wall combined steel cofferdam ballast.
A kind of single and double-wall combined steel cofferdam, coxopodite side plate cofferdam 1 is made of the exterior panel 2 and the inside panel 3 of annular, horizontal support ring flat-plate 4 and coxopodite that the reinforcing rib effect has been installed between exterior panel 2 and inside panel 3 vertically support angle steel 5, be linked to be integral body with horizontal diagonal brace angle steel 6 between the horizontal support ring flat-plate 4, on the exterior panel 2 of annular, be fixed with the epimerite side plate cofferdam 7 that is single-wall structure, the epimerite that has been fixed with the reinforcing rib effect between epimerite side plate cofferdam 7 and exterior panel 2 vertically supports angle steel 8, and the inwall in epimerite side plate cofferdam 7 is provided with horizontal cross rib 10 of upper two layers and the horizontal cross rib 11 of lower two layers.
In epimerite side plate cofferdam 7, the place, four angles of the horizontal cross rib 11 of lower two layers is provided with two-layer epimerite diagonal brace 9, and epimerite diagonal brace 9 adopts I32.
Be provided with between the inside panel 3 in coxopodite side plate cofferdam 1 in the two-layer coxopodite and support 12, support 12 in every layer of coxopodite and adopt single I32.
The thick panel of 6mm is adopted in epimerite side plate cofferdam 7, the vertical spacing d of the horizontal cross rib of adjacent two layers is 1000mm, the horizontal cross rib 11 of lower two layers adopts 400 * 10/200 * 12 " T " word combining structures of forming, and the horizontal cross rib 10 of upper two layers adopts 350 * 10/200 * 12 " T " word combining structures of forming.
Spacing a between exterior panel 2 and the inside panel 3 is 1000mm, and exterior panel 2 and inside panel 3 all adopt the thick panel of 6mm; Horizontal support ring flat-plate 4 is 160 * 10mm, and laterally diagonal brace angle steel 6 is ∠ 63 * 63 * 6 angle steel, and the vertical spacing b that the horizontal support ring flat-plate is 4 is 1000mm; Coxopodite vertically supports angle steel 5 and is ∠ 63 * 40 * 6 angle steel, and level interval c is 450mm.
Claims (1)
1. single and double-wall combined steel cofferdam construction method is characterized in that:
A, after factory completes the coxopodite side plate cofferdam (1) of single and double-wall combined steel cofferdam and epimerite side plate cofferdam (7) piecemeal, be transported to the assembly unit that coxopodite side plate cofferdam (1) part is carried out in smooth assembly unit place, beach place, bank by the sidewalk of going to river, the requirement of going to river in coxopodite side plate cofferdam (1) should be considered in the position in the assembly unit place in coxopodite side plate cofferdam (1), to be convenient to go to river in the position in assembly unit place, according to on-site actual situations, transportation by driving when the employing higher level is gone to river in coxopodite side plate cofferdam (1), when assembly unit coxopodite side plate cofferdam (1), isolate with water blockoff dam and river course, after coxopodite side plate cofferdam (1) assembly unit is good, excavate the water blockoff dam, river is entered, coxopodite side plate cofferdam (1) just can be floated, and utilizes tugboat to haul out assembly unit place transportation by driving to the pier position;
After going to river in B, coxopodite side plate cofferdam (1), by method perfusion sword pin (13) inner concrete of doing place's routine work, increase the weight in coxopodite side plate cofferdam (1), coxopodite side plate cofferdam (1) is sunk, draft is deepened; Begin assembly unit epimerite side plate cofferdam (7) and epimerite diagonal brace (9) then; Single and double-wall combined steel cofferdam connects height finish after, welding double-wall cofferdam end face cover plate, and weld two and draw water and use steel pipe is used to regulate single and double-wall combined steel cofferdam and sinks and accurately locate;
C, utilize station keeping ship that single and double-wall combined steel cofferdam is located: welding stop limits single and double-wall combined steel cofferdam plan-position on station keeping ship, vertically removable; Primary Location is carried out in sinkings of pouring water in the double-walled that the exterior panel (2) in coxopodite side plate cofferdam (1) and inside panel (3) constitute earlier, accurately locatees again, and pouring water after treating accurately to locate sinks down into the riverbed again;
D, basic clearly: clear up with the air suction dredge earlier to carrying out in the single and double-wall combined steel cofferdam, silt particle on the scar is cleaned out, sent water inspection under the diver after finishing, the affirmation substrate is cleaned out, so that make bottom concrete and scar knot and good, reach the purpose of sealing; Set up drilling platform at the top of single and double-wall combined steel cofferdam then, the steel casing is installed;
E, in the beginning of the 0.7m place of the inside panel (3) of distance single and double-wall combined steel cofferdam to the high sandbag of center range pile, notice during pile that sandbag must not invade in sword pin (13) scope, send the diver to be lowered to water-bed pile all around; Beyond the sandbag and sword pin (13) below, adopt conduit underwater grouting bottom concrete then, treat that concrete reaches 90% design strength after, rigging up carries out Bored Pile Construction on drilling platform;
After F, pile foundation construction are finished,, carry out drawing water in the single and double-wall combined steel cofferdam, cut off the steel casing, cut the pile crown laitance, carry out the construction of cushion cap at the top of single and double-wall combined steel cofferdam ballast.
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