CN103938638A - Buoy type deepwater single-wall steel cofferdam construction method - Google Patents

Buoy type deepwater single-wall steel cofferdam construction method Download PDF

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Publication number
CN103938638A
CN103938638A CN201410118240.1A CN201410118240A CN103938638A CN 103938638 A CN103938638 A CN 103938638A CN 201410118240 A CN201410118240 A CN 201410118240A CN 103938638 A CN103938638 A CN 103938638A
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China
Prior art keywords
wall steel
steel cofferdam
cofferdam
floating drum
wall
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CN201410118240.1A
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Chinese (zh)
Inventor
蔡军
陈方红
康慧文
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HUNAN SHUNTIAN CONSTRUCTION GROUP CO Ltd
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HUNAN SHUNTIAN CONSTRUCTION GROUP CO Ltd
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Priority to CN201410118240.1A priority Critical patent/CN103938638A/en
Publication of CN103938638A publication Critical patent/CN103938638A/en
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Abstract

The invention discloses a buoy type deepwater single-wall steel cofferdam construction method which comprises the steps of (1) design of a single-wall steel cofferdam, (2) design of a steel buoy and a balance weight, (3) manufacturing and water testing of the steel buoy, (4) manufacturing and assembly of the single-wall steel cofferdam, (5) diving floating transportation of the single-wall steel cofferdam, (6) positioning and sinking of the single-wall steel cofferdam, (7) foundation clearing and bottom sealing of the single-wall steel cofferdam, (8) installation of an inner supporting framework of the single-wall steel cofferdam, (9) dewatering and leaking stoppage, and (10) dismantling of the single-wall steel cofferdam. The method can effective solve the problems of the assembly site of the single-wall steel cofferdam, equipment transportation, sinking deviation rectification during positioning and sinking of the single-wall steel cofferdam.

Description

A kind of construction method of deep water single-wall steel cofferdam floating drum method
Technical field
The present invention relates to cofferdam construction technical field, be specifically related to a kind of construction method of deep water single-wall steel cofferdam floating drum method.
Background technology
Under 6 ~ 10 meters of depth conditions, when bridge foundation is constructed, adopt the economic indicator obtaining after single-wall steel cofferdam better, but at the river section of the big-and-middle-sized power of disappearance transport ship, the problems such as the sinking correction need to solve the transport of single-wall steel cofferdam assembling place, equipment and single-wall steel cofferdam positioning sinking time.
Summary of the invention
Lack the unfavorable conditions such as medium-and-large-sized power transport ship for profundal zone, the invention provides a kind of construction method of deep water single-wall steel cofferdam floating drum method, the problem that the sinking correction can effectively solve the transport of single-wall steel cofferdam assembling place, equipment and single-wall steel cofferdam positioning sinking time etc. runs into.
The construction method of a kind of deep water single-wall steel cofferdam floating drum method of the present invention, this engineering method comprises the following steps:
1) single-walled steel cofferdam design;
2) steel floating drum and counterbalance design;
3) steel floating drum is made and examination water;
4) single-wall steel cofferdam is made and is assembled;
5) single-wall steel cofferdam enters water transportation by driving;
6) single-wall steel cofferdam positioning sinking;
7) the clear base back cover of single-wall steel cofferdam;
8) single-wall steel cofferdam inner support skeleton is installed;
9) leak stopping of drawing water;
10) dismounting of single-wall steel cofferdam.
In step 1) single-walled steel cofferdam design, the calculating content of single-wall steel cofferdam comprises: lateral force is calculated; Panel and supported design; Bottoming concrete thickness design.
Step 2) in steel floating drum and counterbalance design, the calculating content of steel floating drum is diameter and the wall thickness of steel floating drum.
Step 3) steel floating drum manufacturing process comprises:
31) steel floating drum rolls and makes and longitudinally welding with three rod plate bending rollss, then carries out Weld Quality Inspection and the hydrostatic test.
Step 4) single-wall steel cofferdam is made and assembled process comprises:
41) first single wall steel is decomposed and is made into single wall steel monolithic, through examination spell and waterproof test qualified after, single wall steel monolithic is indicated to processing sequence, then process comprehensively;
42) select a place, first lay steel floating drum as column, then using i iron as crossbeam, by crossbeam pull-up, and keep crossbeam to be horizontal with Chain block;
43) then assemble with sling single wall steel monolithic and single-wall steel cofferdam of mobile crane, with bolts between single wall steel monolithic, and use rubber strip joint filling.
The process that step 5) single-wall steel cofferdam enters water transportation by driving is specially:
51) on guide rail, lay slide plate, after single-wall steel cofferdam installs, guide rail is put down, and remove steel floating drum column, then lay four steel floating drums in single-wall steel cofferdam both sides, then with hoist engine or Chain block, single-wall steel cofferdam is drawn in to korneforos, and single-wall steel cofferdam is drawn to pier position place with Power Vessel.
The process of step 6) single-wall steel cofferdam positioning sinking is specially:
61) first by controlling anchor line length, single-wall steel cofferdam is steadily sunk, when sinking, keep the top of single-wall steel cofferdam in level, in the time that the sword underfooting of single-wall steel cofferdam sinks apart from the about 1.0m in riverbed, start to adjust the position of single-wall steel cofferdam, and single-wall steel cofferdam is positioned;
62) then make single-wall steel cofferdam implantation, when behind contact riverbed, single-wall steel cofferdam bottom, judge and control the verticality of single-wall steel cofferdam by single-wall steel cofferdam freeboard around, in the time that sinking, single-wall steel cofferdam occurs tilting, adopt airlift suction dredger to carry out part to the riverbed of the higher side bottom of single-wall steel cofferdam and inhale mud construction, after correction single-wall steel cofferdam gradient completes, stop inhaling mud construction, and when finding after single-wall steel cofferdam implantation that its off normal is larger, adjust anchor line and make single-wall steel cofferdam floating, readjust single-wall steel cofferdam position and re-start implantation,
63) after the correct implantation of single-wall steel cofferdam, remove steel floating drum snap close, then drag-line is installed, steel floating drum floats on the surface of the water rear recovery.
Step 61) localization method of single-wall steel cofferdam location is: measures the coordinate of four angle points of single-wall steel cofferdam by total powerstation, adjusts anchor line, make single-wall steel cofferdam position consistent with design attitude, the location that completes steel cofferdam.
The detailed process of the clear base back cover of single-wall steel cofferdam described in step 7) is:
71) adopt whole plane entirety evenly to raise the mode of building when concreting, and arrange accordingly conduit; In casting process, every conduit mouth is poured into design height, then build the situation of the height at top according to bottom concrete, conduit mouth is transferred to lower position, and at the bottom of conduit, mouth, apart from top of concrete 15 ~ 20cm, requires to carry out conduit secondary sealing according to first batch of concreting again.
Step 8) is installed single-wall steel cofferdam inner support skeleton: after pile foundation completes, first remove the i iron platform on single-wall steel cofferdam, then remove supporting steel pipe, carry out from top to bottom the installation of inner supporting bone shelf.
The draw water detailed process of leak stopping of step 9) comprises:
91) open pumping for water pump, find that there is the part of leaking, stop up outside to inside from single-wall steel cofferdam with regard to the leak stopping thing with being equipped with; After water is drained, stop work approximately 4 hours, then observe single-wall steel cofferdam and whether have distortion, in the time that single-wall steel cofferdam does not exist large deformation, cut off the steel floating drum in single-wall steel cofferdam, excision pile crown.
The detailed process of the dismounting in step 10) cofferdam comprises:
101) scum silica frost of removing back cover concrete end face, assembling reinforcement, cast cushion cap concrete, to the high position of 1.3m, is removed first floor horizontal skeleton;
102) pre-buried pier shaft reinforcing bar, colligation cushion cap reinforcing bar, pour concrete, to cushion cap end face absolute altitude, adds inclined support structure to the horizontal skeleton in single-wall steel cofferdam, cuts off cross, construction pier stud;
103) recharge water, to water balance inside and outside single-wall steel cofferdam, takes out inner support skeleton, removes single-wall steel cofferdam bolt by diver, reclaims single-wall steel cofferdam material, completes the single-wall steel cofferdam work of removing.
The present invention compared with prior art has the following advantages:
1, single-wall steel cofferdam has taked first burst to make panel, the rear mode of utilizing floating drum to set up assembly platform as column, and assembling, the inspection inspection work of burst all can be carried out on assembly platform, have reduced the workload of pier hyte dress.
2, steel floating drum is as the buoyancy equipment of assembled rear single-wall steel cofferdam, and collocation small-sized machine towboat, is transported to pier position by single-wall steel cofferdam, has solved the problem that lacks medium-and-large-sized power transport ship.
3, in the positioning sinking process of single-wall steel cofferdam, regulate anchor line length by water filling counterweight and the hoist engine of steel floating drum, can operate preferably single-wall steel cofferdam and sink and rectify a deviation.
In sum, the present invention is reasonable in design, construction sequence is simple, input cost is low and applicable to the construction in the deep water single wall cofferdam of 6 ~ 8 meters, can solve simultaneously single-wall steel cofferdam set up assembling place, transportation by driving and positioning sinking correction time the problem that exists.
Brief description of the drawings
Fig. 1 is construction flow chart of the present invention;
Fig. 2 is that single-wall steel cofferdam is installed the elevational schematic view after steel floating drum;
Fig. 3 is that single-wall steel cofferdam is installed the side schematic view after steel floating drum;
Fig. 4 is the a-quadrant enlarged drawing in Fig. 2;
Fig. 5 is the B regional enlarged drawing in Fig. 2;
Fig. 6 is the C regional enlarged drawing in Fig. 3.
Description of reference numerals:
1-single-wall steel cofferdam; 2-steel floating drum; 3-linear guides;
4-wire rope; 5-single-wall steel cofferdam snap close; 6-steel floating drum snap close;
7-unload first; 8-travel(l)ing rest.
Detailed description of the invention
Now by reference to the accompanying drawings the present invention is described in further detail.
As shown in accompanying drawing 1 to 6, a kind of construction method of deep water single-wall steel cofferdam floating drum method, this engineering method comprises the following steps:
Step 1, single-walled steel cofferdam design: can be divided into drawing water in bottom concrete construction stage and single-wall steel cofferdam according to the loading characteristic in single-walled steel cofferdam construction process and analyze to maximum stage two kinds of unfavorable operating modes of water-head inside and outside single-wall steel cofferdam, it calculates content and comprises: lateral force is calculated; Panel, vertical supporting and laterally inner support design; Bottoming concrete thickness design.
Step 2, steel floating drum and counterbalance design: according to steel float buoyancy F floatingbe greater than steel cofferdam weight and floating drum weight sum (G floating+ G weir), buoyancy F after steel floating drum counterweight floatingbe less than steel cofferdam weight, counterweight and steel floating drum weight sum (G floating+ G weir+ G join), buoyancy F after steel floating drum water filling counterweight floatingbe greater than counterweight and steel floating drum weight sum (G floating+ G join) steel floating drum and counterbalance design principle, calculate steel spar diameter and wall thickness; Before carrying out the making of steel floating drum, first carry out preparation of construction work, main preparation is exactly the preparation in artificial, material, machinery, place etc.
Step 3, steel floating drum are made and examination water: after rolling steel casing with three rod plate bending rollss at the scene, weld vertical attachment weld and steel floating drum barrel end plate weld joint by electric welder, then carry out Weld Quality Inspection and the hydrostatic test, while ensureing to be immersed in the water under empty regimen condition, weld seam is not destroyed and there will not be drainage.
Step 4, single-wall steel cofferdam are made and are assembled: first single-wall steel cofferdam is decomposed and is made into a small amount of single wall steel monolithic, through examination spell and waterproof test qualified after, in order to prevent that on-site consolidation from makeing mistakes, single wall steel monolithic is indicated to processing sequence, then process comprehensively; In the wallboard of piecemeal processing cofferdam, locate near water on riverbank to select a place, due to physical features injustice, first lay steel floating drum as column, then using i iron as crossbeam, by crossbeam pull-up, and keep crossbeam in level with Chain block; Then carry out single-wall steel cofferdam assembling with the mobile crane single wall steel monolithic of slinging, with bolts between single wall steel monolithic, and use rubber strip joint filling; Finally the complete single-wall steel cofferdam of spelling is checked comprehensively, the scope of examination comprises its physical dimension, verticality, torsion degree, bolt connection and the tight situation of seam etc.
Step 5, single-wall steel cofferdam enter water transportation by driving: on guide rail, lay slide plate, after single-wall steel cofferdam installs, guide rail is put down, and remove steel floating drum column, lay four steel floating drums in single-wall steel cofferdam both sides, then with hoist engine or Chain block, single-wall steel cofferdam is gently steadily drawn in to korneforos, and single-wall steel cofferdam is drawn to pier position place with Power Vessel.
Step 6, single-wall steel cofferdam location and sinking:
The localization method of 6.1 single-wall steel cofferdams is to use total powerstation to measure the coordinate of four angle points of single-wall steel cofferdam, adjusts anchor line, makes the residing position of single-wall steel cofferdam consistent with design attitude, the location that completes steel cofferdam.The detailed process of single-wall steel cofferdam location is for first steadily sinking steel cofferdam by controlling anchor line length, when sinking, keep single-wall steel cofferdam top in level, in the time that the sword underfooting of single-wall steel cofferdam sinks apart from the about 1.0m in riverbed, start to adjust the position of single-wall steel cofferdam, and single-wall steel cofferdam is positioned.
6.2 single-wall steel cofferdam implantations adopt steadily, local method of inhaling mud.When behind contact riverbed, single-wall steel cofferdam bottom, by steel cofferdam freeboard judgement around and the verticality of control single-wall steel cofferdam, if there is the situation of inclination when single-wall steel cofferdam sinks, adopt airlift suction dredger to carry out part to the riverbed of the higher side bottom of single-wall steel cofferdam and inhale mud construction.After single-wall steel cofferdam rectification completes, stop inhaling mud construction; If find after single-wall steel cofferdam implantation that off normal is larger, adjust anchor line and make single-wall steel cofferdam floating, readjust single-wall steel cofferdam position implantation again.
After the smooth implantation of 6.3 single-wall steel cofferdam, remove steel floating drum snap close, then drag-line is installed, after steel floating drum floats on the surface of the water, reclaim.
Step 7, the clear base back cover of single-wall steel cofferdam: when concreting, adopt whole plane entirety evenly to raise the mode of building, and arrange accordingly conduit, in casting process, every conduit mouth is poured into after design altitude, build the situation of crest level according to bottom concrete, be transferred to lower position, at the bottom of conduit, mouth, apart from top of concrete 15 ~ 20cm, requires to carry out conduit secondary sealing according to first batch of concreting.
Step 8, single-wall steel cofferdam inner support skeleton is installed: after pile foundation completes, first remove the i iron platform on single-wall steel cofferdam, remove supporting steel pipe, after carry out the installation of single-wall steel cofferdam inner support skeleton.
Step 9, the leak stopping of drawing water:
9.1 open bigbore pumping for water pump, find to leak part, stop up outside to inside from single-wall steel cofferdam with the leak stopping thing being equipped with in time; After water is drained, stop work 4 hours, then observe single-wall steel cofferdam and whether have distortion, if determine without after moderate finite deformation, in single-wall steel cofferdam, cut off steel casing, abolish pile crown.
The dismounting of step 10, single-wall steel cofferdam:
10.1 remove the scum silica frost at back cover concrete top, assembling reinforcement, and cast cushion cap concrete, to 1.3m height, is removed first floor horizontal skeleton;
10.2 pre-buried pier shaft reinforcing bars, colligation cushion cap reinforcing bar, cast cushion cap concrete is to cushion cap end face absolute altitude, and the horizontal skeleton in single-wall steel cofferdam supports and adds diagonal brace simultaneously, cuts off cross, construction pier stud;
10.3 recharge waters keep water balance to single-wall steel cofferdam, take out inner support skeleton, are removed the bolt of single-wall steel cofferdam by diver, reclaim single-wall steel cofferdam material, complete the single-wall steel cofferdam work of removing.

Claims (11)

1. a construction method for deep water single-wall steel cofferdam floating drum method, is characterized in that this engineering method comprises the following steps:
1) single-walled steel cofferdam design;
2) steel floating drum and counterbalance design;
3) steel floating drum is made and examination water;
4) single-wall steel cofferdam is made and is assembled;
5) single-wall steel cofferdam enters water transportation by driving;
6) single-wall steel cofferdam positioning sinking;
7) the clear base back cover of single-wall steel cofferdam;
8) single-wall steel cofferdam inner support skeleton is installed;
9) leak stopping of drawing water;
10) dismounting of single-wall steel cofferdam.
2. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, is characterized in that in step 1) single-walled steel cofferdam design, and the calculating content of single-wall steel cofferdam comprises:
11) lateral force is calculated;
12) panel, vertical supporting and the design of horizontal inner support;
13) bottoming concrete thickness design.
3. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, is characterized in that step 2) in steel floating drum and counterbalance design, the calculating content of steel floating drum is diameter and the wall thickness of steel floating drum.
4. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, it is characterized in that step 3) steel floating drum manufacturing process is: steel floating drum three rod plate bending rollss roll to be made and longitudinally welding, then carries out Weld Quality Inspection and the hydrostatic test.
5. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, is characterized in that step 4) single-wall steel cofferdam is made and assembled process comprises:
41) first single wall steel is decomposed and is made into single wall steel monolithic, through examination spell and waterproof test qualified after, single wall steel monolithic is indicated to processing sequence, then process comprehensively;
42) select a place, first lay steel floating drum as column, then using i iron as crossbeam, by crossbeam pull-up, and keep crossbeam to be horizontal with Chain block;
43) then assemble with sling single wall steel monolithic and single-wall steel cofferdam of mobile crane, with bolts between single wall steel monolithic, and use rubber strip joint filling.
6. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, is characterized in that the process that step 5) single-wall steel cofferdam enters water transportation by driving is specially:
51) on linear guides, lay slide plate, after single-wall steel cofferdam installs, guide rail is put down, and remove steel floating drum column, then lay four steel floating drums in single-wall steel cofferdam both sides, then with hoist engine or Chain block, single-wall steel cofferdam is drawn in to korneforos, and single-wall steel cofferdam is drawn to pier position place with Power Vessel.
7. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, is characterized in that step 6) single-wall steel cofferdam location and the process of sinking are specially:
61) first by controlling anchor line length, single-wall steel cofferdam is steadily sunk, when sinking, keep the top of single-wall steel cofferdam in level, in the time that the sword underfooting of single-wall steel cofferdam sinks apart from the about 1.0m in riverbed, start to adjust the position of single-wall steel cofferdam, and single-wall steel cofferdam is positioned;
62) then make single-wall steel cofferdam implantation, when behind contact riverbed, single-wall steel cofferdam bottom, judge and control the verticality of single-wall steel cofferdam by single-wall steel cofferdam freeboard around, in the time that sinking, single-wall steel cofferdam occurs tilting, adopt airlift suction dredger to carry out part to the riverbed of the higher side bottom of single-wall steel cofferdam and inhale mud construction, after correction single-wall steel cofferdam gradient completes, stop inhaling mud construction, and when finding after single-wall steel cofferdam implantation that its off normal is larger, adjust anchor line and make single-wall steel cofferdam floating, readjust single-wall steel cofferdam position and re-start implantation,
63) after the correct implantation of single-wall steel cofferdam, remove steel floating drum snap close, then drag-line is installed, steel floating drum floats on the surface of the water rear recovery.
8. according to the construction method of a kind of deep water single-wall steel cofferdam floating drum method described in claim 1 or 7, it is characterized in that step 61) localization method of single-wall steel cofferdam location is: the coordinate of measuring four angle points of single-wall steel cofferdam by total powerstation, adjust anchor line, make single-wall steel cofferdam position consistent with design attitude, the location that completes steel cofferdam.
9. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, is characterized in that the detailed process of the clear base back cover of single-wall steel cofferdam described in step 7) is:
71) adopt whole plane entirety evenly to raise the mode of building when concreting, and arrange accordingly conduit; In casting process, every conduit mouth is poured into design height, then build the situation of the height at top according to bottom concrete, conduit mouth is transferred to lower position, and at the bottom of conduit, mouth, apart from top of concrete 15 ~ 20cm, requires to carry out conduit secondary sealing according to first batch of concreting again.
10. the construction method of a kind of deep water single-wall steel cofferdam floating drum method according to claim 1, is characterized in that the draw water detailed process of leak stopping of step 8) comprises:
81) open pumping for water pump, find that there is the part of leaking, just stop up outside to inside from single-wall steel cofferdam with leak stopping thing; After water is drained, stop work approximately 4 hours, then observe single-wall steel cofferdam and whether have distortion, in the time that single-wall steel cofferdam does not exist large deformation, cut off the steel floating drum in single-wall steel cofferdam, excision pile crown.
The construction method of 11. a kind of deep water single-wall steel cofferdam floating drum methods according to claim 1, is characterized in that the detailed process of the dismounting in step 9) cofferdam comprises:
91) scum silica frost of removing back cover concrete end face, assembling reinforcement, cast cushion cap concrete, to the high position of 1.3m, is removed first floor horizontal skeleton;
92) pre-buried pier shaft reinforcing bar, colligation cushion cap reinforcing bar, pour concrete, to cushion cap end face absolute altitude, adds inclined support structure to the horizontal skeleton in single-wall steel cofferdam, cuts off cross, construction pier stud;
93) recharge water, to water balance inside and outside single-wall steel cofferdam, takes out inner support skeleton, removes single-wall steel cofferdam bolt.
CN201410118240.1A 2014-03-27 2014-03-27 Buoy type deepwater single-wall steel cofferdam construction method Pending CN103938638A (en)

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Application Number Priority Date Filing Date Title
CN201410118240.1A CN103938638A (en) 2014-03-27 2014-03-27 Buoy type deepwater single-wall steel cofferdam construction method

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Publication number Priority date Publication date Assignee Title
CN105507322A (en) * 2016-01-21 2016-04-20 中铁隧道集团有限公司 Drying cutting method for foundation pit steel tube plug pile in immersed tube tunnel cofferdam
CN105926628A (en) * 2016-06-12 2016-09-07 中交公局第三工程有限公司 Device for underwater pile foundation construction platform convertible in floating and fixing
CN105862678A (en) * 2016-06-14 2016-08-17 中国电建集团贵阳勘测设计研究院有限公司 Method for erecting trash racks and trash rack buoy with retractable grids
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CN110562399A (en) * 2019-08-12 2019-12-13 长江勘测规划设计研究有限责任公司 Power boat for channel cofferdam area and water pumping and injecting method
CN110792090A (en) * 2019-10-18 2020-02-14 龙德建设有限公司 Floating arch cofferdam for reservoir and construction method thereof
CN114032933A (en) * 2021-10-13 2022-02-11 中交路桥建设有限公司 Construction method of steel cofferdam for underwater pier maintenance
CN114032933B (en) * 2021-10-13 2023-02-14 中交路桥建设有限公司 Construction method of steel cofferdam for underwater pier maintenance

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Application publication date: 20140723