CN101333818B - Pile film cofferdam and its construction method - Google Patents
Pile film cofferdam and its construction method Download PDFInfo
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- CN101333818B CN101333818B CN2008101167656A CN200810116765A CN101333818B CN 101333818 B CN101333818 B CN 101333818B CN 2008101167656 A CN2008101167656 A CN 2008101167656A CN 200810116765 A CN200810116765 A CN 200810116765A CN 101333818 B CN101333818 B CN 101333818B
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Abstract
Disclosed is a pile film cofferdam and a construction method; the cofferdam comprises a support component, a waterproof film cloth and sandbags; the dam body is formed by the support component; the waterproof film cloth is laid on the water facing surface and the water bottom of the support component; the film cloth is adhered to the dam body in a sealing way to have certain height; the film cloth is adhered to the river (pool) bottom in a sealing way to have certain length so that the film cloth has the effects of water blocking off and anti leakage; the sandbags are arranged on the waterproof film cloth to press the edge of the film cloth; the construction steps are the followings of flatting the river bottom, measurement and positioning, making a pontoon in position, striking piles , binding a lock port girder, hanging a reed shade, a formwork or a steel bat, striking a raking shore or/and reinforcing the piles through pull rods, transverse head weir construction, laying the waterproof film cloth, pressing the sandbags, drainage and guiding flow, reinforcing the piles, horizontal girder and the reed shade. The pile film cofferdam and the construction method has the advantages that the pile film cofferdam has fast construction speed; the occupied flow cross-section is small; the pile film cofferdam is convenient in application; the cofferdam can be removed completely without polluting the water body and can be used repeatedly; the construction process is scientific and practical, and has high work efficiency.
Description
Technical field
The present invention relates to a kind of pile film cofferdam and job practices thereof, its purposes is to cross certain zone in irrigation canals and ditches, lake, river, and the ponding in the removing cofferdam is so that carry out engineering construction in anhydrous cofferdam, is mainly used in that urban water system is administered in the engineering construction, in the construction of various cross a river buildings, in the various building facilities construction of going into the river mouth and in the swag, reservoir desilting construction.
Background technology
In the rebuilding construction that carries out in waters such as lake, river, general at the traditional turf cofferdam of river course intermediate arrangement for guaranteeing not cut off the water in construction period along the line, the sequence of construction of another bank behind elder generation's one bank is to satisfy maximum water flow 6～8m
3The requirement of/s.The turf cofferdam crest level designs the cofferdam section at the above 30cm of the water surface, depth of water 2.5m, and height of weir 2.8m presses weir crest width 1.0m, and the side slope slope considers that than 1: 0.75～1.0 the cofferdam section is at 8.68m
2～10.64m
2Between.Therefore the turf cofferdam section is bigger, and it is bigger to occupy the cross-section of river.When in the channel during water flow increases, the weir cave-in accident very likely appears overflowing, brought very big difficulty to construction.In addition, when construction finished, turf cofferdam was difficult to remove clean, can cause certain pollution to the water source.
Summary of the invention
Purpose of the present invention just provides a kind of pile film cofferdam and job practices thereof, and the cross-section of river is big, engineering quantity is big with occupying of existing of the turf cofferdam that solves prior art, native source difficulty, and can't thoroughly remove problem with polluted source.
Technical scheme of the present invention is:
A kind of pile film cofferdam comprises supporting component, waterproof film cloth and sandbag, and waterproof film cloth is layed in the upstream face and the bottom of supporting component, and forming the cross section is L shaped weir body; Hang the pressure that described sandbag is used for the upright seam of connection of upstream face waterproof film cloth and establish being positioned at described supporting component top, on the waterproof film cloth that is positioned on the described bottom, also be placed with described sandbag in addition, be used for flanging, tooled joint and presser feet waterproof film cloth.It is characterized in that: described supporting component comprises staking out, fore shaft beam, horizontal beam, film cloth bed course and is located at strengthening mechanism in the described staking out that the described bottom is inserted in the lower end of this staking out.
The job practices of pile film cofferdam is characterized in that: comprise following flow process: play staking out → fore shaft beam colligation → beat diagonal brace → horizontal beam installation → extension reed curtain or steel bat → spread film against the current, finish the end-blocking head weir → bag → row's precipitation of pressing, cod → cofferdam simultaneously and reinforce.
Advantage of the present invention is: the pile film cofferdam speed of application is fast, and it is little, simple and easy to do to occupy the cross-section of river, and cofferdam demolition thoroughly and pollution-free to water body can have enough to meet the need use repeatedly; The practicality of construction technology science, high efficiency.Be applicable to sand gravel and various soil properties stratum.
Description of drawings
Fig. 1 is a timber film cofferdam structural representation of the present invention;
Fig. 2 is a piling bar film cofferdam structural representation of the present invention;
Fig. 3 is a simple and easy raft schematic diagram of the present invention;
Fig. 4 is the perspective view of piling stone flat stone with ropes attached at the sides of the present invention;
Fig. 5 is the sectional schematic diagram of long river pile film cofferdam embodiment of the present invention;
Fig. 6 is the sectional schematic diagram of the present invention's pile film cofferdam when the sand gravel base treatment;
Fig. 7 is the arrangement diagram in natural gas line Chuan He of the present invention cofferdam;
Fig. 8 is a guide pile film cofferdam sectional schematic diagram among the present invention;
Fig. 9 is that staking out of the present invention is the cofferdam structure schematic diagram of framework;
Figure 10 is the schematic diagram that the present invention uses in going into river building facilities construction;
Figure 11 is the sectional schematic diagram of stake mould aqueduct cofferdam embodiment of the present invention;
Figure 12 is the sectional schematic diagram of the two pile film cofferdam embodiment of the present invention.
Description of reference numerals: 1, staking out, 2, diagonal brace, 3, horizontal beam, 4, (waterproof) film cloth, 5, fore shaft beam, 6, sand pocket, 7, pull bar, 8, turnbuckle, 9, the steel bat, 91, steel (mould) plate, 10, embankment, 11, the stake of towing, 12,20cm mortar press mold, 13,
150 piling bar sleeve pipes, 14, build sleeve pipe concrete (bar shaped), 15, default dowel, 16, reed curtain, 17, the sand pocket lifting rope, 19, the diagonal brace bottom girder, 23, aqueduct (steel form in shop film cloth), 24, the support pull bar, 25, bridging, 26, stull, 27, the cross a river building, 30, the embankment dam, 40, precipitation well, 41, plank, 42, floating drum, 43, handle, 44, the stone flat stone with ropes attached at the sides, 45, the rope made of hemp, 50, the pipeline of burying underground, A1, first phase pile film cofferdam, A2, the second stage of pile film cofferdam, Q, preceding cross weir, H, back cross weir, B, gusseted, 60, bridge pier, 70, the rainwater culvert is gone into the river mouth, and 80, bridge pier.
The specific embodiment
Embodiment 1: one-sided timber film cofferdam
In Beijing drawing in the first phase three mark engineerings, according to water conservancy diversion discharge capacity 9.6m
3/ s, depth of water 2.2m, add superelevation 30cm, design one-sided timber film cofferdam, see Fig. 1.Single timber film cofferdam is to make staking out 1 and diagonal brace 2 in channel, and hangs horizontal distribution beam 3, reed curtain 16 and dash film cloth 4 at upstream face.This method construction is simple, not limited by materials processing, and construction speed is fast.
Relevant use material and data:
1. staking out 1:
18～20cm pine round log, long 4.5m, the stake point becomes three-side cone, the sharp length 1.5～2.0D of stake, stake top 8# galvanized wire adds hoop, pile spacing 1.5m, stake embedded depth 2.0m,
2. diagonal brace 2:
14～18cm pine round log, length 5.0m, embedded depth are greater than 1.5m, and angle is 45 °.
3. horizontal beam 3:5 * 10 square steel, six roads, spacing is respectively 30cm, 30cm, 40cm, 40cm, 50cm, 50cm from bottom to top.
4. the reed curtain 16: special reed curtain, and high 2.5m, the thick close muscle of bar, every 50cm adds a small bamboo.
5. waterproof film cloth 4: adopt strong paulin in the polyvinyl chloride, thickness 0.48 ± 0.03mm, radially breaking tenacity 〉=600
N/
5cm, broadwise breaking tenacity 〉=540
N/
5cm, 80 ℃ of heat-proof agings, 24h no change.L type shop film, height: wide=1: 2.5～3, view picture width 11m overlaps hot weld if film cloth is narrow, and the welding breaking tenacity requires to be not less than former cloth.Longitudinal lap joint shop film 4, lap length is not less than 3.0m.Fore shaft beam 5 (referring to be placed on the beam that staking out 1 top is used to reinforce locking staking out top) is housed on the top of staking out 1, on the waterproof film cloth 4 of upstream face and bottom surface, hangs respectively and establish and place sandbag 6.
The construction technology process of this list timber film cofferdam is:
Smooth river bed → staking out measurement and positioning → pontoon is in place → tear the weir open after playing staking out 1 → fore shaft beam 5 colligations → play construction → shop, diagonal brace 2 → horizontal beam 3 installation → extension reed curtains, 16 → cross-peen weirs (end socket weir) film cloth 4 → pressure sand pocket 6 → draining water conservancy diversion → reinforcing staking out 1, horizontal beam 3 and the operation completion of reed curtain 16 → cofferdam
Described pontoon concrete structure adopts boarding 41 formations on a plurality of floating drums 42 as shown in Figure 3.
Embodiment 2: bilateral steel pipe pile film cofferdam
See Fig. 2, on the basis of above-mentioned single timber film cofferdam success of the test, for making the cofferdam when guaranteeing flow conductivity, once can provide the two sides work plane to construct simultaneously, we have designed again and have occupied the bilateral piling bar film cofferdam that river cross-section is little and the number of turnover is many.The cofferdam is a rectangular cross section, the wide 14m in weir, both sides height of weir 2.5m, upstream face shop typing steel bat 9 in the staking out 1 of both sides, constitute riverbed, the korneforos skeleton in " U " type cross section, then, form middle " U " type cross-section of river in river at inboard " U " type film cloth 4 of laying of this " U " type riverbed skeleton.For guaranteeing the outside easy construction of cofferdam monolithic stability and cofferdam, we have removed the diagonal brace 2 among the last embodiment, adopt
The method that 10 round steel draw relative staking out 1 pile crown as 7 pairs on pull bar guarantees the stable of stake.Add together to drawing reinforcing bar 7, tension and adjusting use turnbuckle 8 every a pair of staking out 1.On the waterproof film cloth 4 of upstream face and bottom surface, hang respectively and establish and place sandbag 6.
Relevant use material and data:
1. staking out 1:
140 steel pipes, the long 4.5m of stake, the stake point is a three-side cone, the long 1.5～2.0D of stake point, pile spacing 1.5m.
2. horizontal beam 3:5 * 10 square steel, six roads, spacing is respectively 30cm, 30cm, 40cm, 40cm, 50cm, 50cm from bottom to top.
3. the steel bat 9: size 2.4 * 3.0m, and 5 * 3 square steel skeletons, thick 3mm steel facing, steel bat 9 connect between staking out 1.
4. film cloth: adopt strong paulin in the polyvinyl chloride, " U " type shop film, view picture width 20m.Longitudinal lap joint shop film, lap length is not less than 3.0m.
5. discharge capacity is calculated:
Press open channel uniform flow
The calculating water flow is 37.56m
3/ s.
The technological process of bilateral piling bar film cofferdam is:
Smooth river bed → staking out measurement and positioning → pontoon is in place → plays staking out 1 → fore shaft beam 5 colligations → construction → shop, horizontal beam 3 installation → extension steel bat 9 → cross-peen weir film cloth 4 → 1 pair of pressure sand pocket 6 → staking out to draw reinforcing → draining water conservancy diversion → reinforcing staking out 1, horizontal beam 3 and the operation completion of turnbuckle 8 → cofferdam to tear the weir open.
Below in conjunction with description of drawings concrete job practices of the present invention:
1), beat the staking out job practices:
Adopt artificial stone (iron) flat stone with ropes attached at the sides 44 to drive piles downstream.The stake position of staking out 1 is at first measured in piling by survey crew, the pontoon of then driving piles is in place, steady stake, frame stool, wear pile cover, stone (iron) flat stone with ropes attached at the sides is driven piles.Piling needs eight people to lift hammer, people commander.
2), horizontal beam 3 and steel bat 9 are installed:
With playing staking out 1, with fore shaft beam 5 is tied up.After pontoon has been played one section staking out 1, hang horizontal beam 3 and steel bat 9, also available reed curtain replaces the steel bat.Horizontal beam 3 adopts suspension ring in place, installs from bottom to top, and suspension ring length is determined by calculating.Along with every layer of horizontal beam 3 progressively reinforced in the decline of water level.After horizontal beam 3 installs, hang up steel bat 9 at upstream face, steel bat 9 uses pontoons manually to install, and is connected smooth-going (aliging in the butt end) between steel bat and the steel bat, if any faulting of slab ends, overlay the arc veneer at upstream face, prevents to damage film cloth 4.
3), the installation of waterproof film cloth 4:
No matter " L " type film cloth 4 in one-sided cofferdam still is " U " type film cloth 4 in bilateral cofferdam, all will use on the fore shaft beam 5 (being horizontal top bar) that pontoon is fixed on the cofferdam with a side or the bilateral of film cloth 4 against the current, allows film cloth 4 bubble through the water column.After vertical suitable for reading being completely fixed of a film cloth 4, earlier the film cloth 4 with the upstream is pressed onto accurate position, river bed, utilizes streaming potential pressure moment that film cloth 4 is completed.After a film cloth 4 is completed, guarantee again to re-lay next piece film cloth 4 under the situation that lap length requires.
Be that pile film cofferdam of the present invention is administered application in engineering embodiment in the Beijing city water system below:
, urban water consumption less according to Beijing city water system river cross-section be big, supplying water can not polluted river channel in can not being interrupted, construct and the characteristics of protection urban environment, and we have selected for use one-sided steel pipe pile film cofferdam to divide for two phases constructed.
Embodiment 3:
Referring to Fig. 5, be that pile film cofferdam method of river diversion of the present invention is in the long river 3
#Concrete application in the mark engineering.River course, long river wide 14～18m suitable for reading, the wide 7m in river bed, water conservancy diversion depth of water 1.2m, diversion Design flow 2～4m
3/ s.Utilize the pile film cofferdam job practices, river regulation be divided into for two phases: first phase earlier in the river course the 10 centers side position of taking back slightly be first phase pile film cofferdam A1 as Fig. 5 a, the same Fig. 1 of cofferdam structure.Utilize left side, river course water conservancy diversion, He Po constructs to the river bed, right side.Pile film cofferdam A2 is in the river bed that second phase constructs in the left side, sees Fig. 5 b.Utilize the second stage of pile film cofferdam water conservancy diversion, He Po constructs to the river bed, left side.Stage II cofferdam height of weir 1.5m (superelevation 50cm) adopts the steel pipe pile of long 2.5m, diameter 140mm, pilespacing 1.5m.When the river bed is sandy soil layer, directly play staking out 1 with weight.Upstream face in staking out 1 is laid horizontal beam 3 with 5 * 10 square steel, spacing 30cm, and horizontal beam 3 adopts the galvanized wire colligation with the junction of staking out 1.Film cloth 4 is that the thick polyvinyl chloride of 0.35mm applies paulin, and the 2.0m overlap joint is adopted in landing edge, and paulin is connected as a single entity.Between horizontal beam 3 and film cloth 4, hang 2mm steel plate 91, make film cloth liner.For guaranteeing the cofferdam resistance to overturning, arrange the timber 11 of towing on slope, right bank river, link to each other with the top of turnbuckle 8 by 6mm plain bar 7 with steel pipe staking out 1,20cm overlap joint, the form of direct welding are adopted in the connection of reinforcing bar 7.
When the secondary cofferdam river bed is the gravel bed of material, directly slower with weight piling, in construction, employing is dug a wide 50cm in pile driving position, and the teeth groove that dark 1m connects is built concrete 14, at the pre-buried internal diameter 150mm of pile driving position, the piling bar sleeve pipe 13 of high 65cm is used for inserting steel staking out 1.For making full use of water pressure, with the pile crown of steel staking out 1 (left side) inclination 10cm laterally.For guaranteeing the resistance to overturning in cofferdam, also can adopt at right bank 1
#Arrange dowels 15 in the foundation of wall 30, the mode that plain bar 7 and the turnbuckle 8 by 10mm links to each other with the top of steel pipe staking out 1.See Fig. 6.
Through engineering construction practice, the pile film cofferdam design and construction to note following some:
1. the stable of footing will be paid close attention to, and the geological condition of probe river bed, will take measures to handle to the relatively poor river bed of geological conditions, in case the stressed back skew of staking out bottom occurs, causes pile film cofferdam to damage at last.
2. draw the running check that will be in operation of the fastness of anchor, pinpoint the problems and in time handle.
When 3. the king pile lacing wire is installed, note drawing reinforcing bar to want stressed even.
4. the spacing of horizontal distribution beam will be passed through mechanical calculation, and is dark more to satisfy water level, the requirement that water pressure is big more.
5. at the bottom of the intrenched stream that the film cloth of water inlet, cofferdam must be firm, and on film cloth, repave last layer topping (tarpaulin, nonwoven etc.).At the bottom of the firm too intrenched stream of topping.Like this, the firstth, the back water that prevents to discharge water enters film cloth is dashed by water, and the secondth, prevented that water caudacoria cloth from being scratched by silt, stone.
6. pile film cofferdam in length and breadth the joint on weir to handle well, the one, resolve stable problem, the 2nd, resolve the laying and the overlap joint problem of film cloth.
Be the application of pile film cofferdam of the present invention in the cross a river architecture construction below:
Along with more and more higher to the requirement of water environment protection in the management of lake, river, Beijing, the application of pile film cofferdam in various cross a river architecture constructions more and more widely.In recent years, all used pile film cofferdam to carry out water conservancy diversion in the architecture constructions such as various cross a river bridges, the gas pipeline that we contacted crosses the river, heat distribution pipeline crosses the river, the electric power telecom conduit crosses the river, the rain sewer line crosses the river, railway box culvert cross a river, not only well solved the problem of preventing water pollution, and it is simple and convenient quick to construct, and has obtained affirming of river management department.
Utilize pile film cofferdam to carry out water conservancy diversion in the cross a river architecture construction and mainly contain following three kinds of forms:
Embodiment 4: twice cofferdam and job practices are led in the limit
Referring to Fig. 7, this kind form water conservancy diversion at first is applicable to the construction of crossing the river of various pipelines 50, and uses under the situation of river cross-section broad.Next is applicable to leads the cross a river bridge construction that cross-section of river requirement can not be satisfied in the cofferdam in the employing, or is provided with the cross a river bridge construction of bridge pier at the river course center line.First phase cofferdam A1 arranges and slightly surpasses river course center line certain distance (concrete condition according to the cross a river or the building that crosses the river is decided), makes the river course one side closed, constructs, and the opposite side river course carries out water conservancy diversion.Constructing in stage II cofferdam A2 sealing opposite side river course, utilizes the river course after the first phase construction is finished to carry out water conservancy diversion.
Embodiment 5: in lead the cofferdam form one time
This kind cofferdam form is best suited for the construction of various cross a river bridges, is particularly useful for the bridge construction that the river course position of center line is not established bridge pier.The Fourth Ring road Fu Shilu that we experienced stride the overpass bridge of approach channel (two seat-box beam bridges, two seat board beam bridges and a T beam bridge), fifth ring road Xiao Cun forever stride six the ring road box girder bridges in Qinghe, Chaoyang three rooms village, Bei Shuanqiaocun stride that Tong Hui river three T beam bridges, Sha Yanglu stride that capital close channel of approach T beam bridge, indigo factory south stride that a T beam bridge, the two seat-box beam bridges of Kun Yuhe and Yong approach channel all use be in lead the cofferdam and carry out water conservancy diversion.These cofferdam total lengths have been added up more than 1200 meter, and the single length overwhelming majority surpasses 100 meters, and maximum discharge capacity satisfies 30m
3The water requirement excessively of/s.
Middle guide pile film cofferdam structure has two kinds of forms:
As shown in Figure 8, play double staking out 1 in the korneforos, upstream face is arranged horizontal beam 3, reed curtain 16, film cloth 4, and staking out 1 arranges that up and down staking out 1 Extra Section supports (diagonal brace) 2 to drawing reinforcing bar 7, and it is stable to guarantee that pile film cofferdam is in operation.Sandbag 6 hanging with rope 17 on the waterproof film cloth 4 that is positioned at staking out 1 upper side on horizontal beam (steel pipe) 3 is placed with sandbag 6 on the waterproof film cloth that is positioned on the described bottom.Also can be provided with one deck sandbag 6 in cofferdam bottom, be provided with diagonal brace bottom girder 19 between the bottom of the bottom of staking out 1 and diagonal brace 2, the three forms triangular support.
As shown in Figure 9, the form of guide pile film cofferdam structure is in the another kind: adopting typing steel frame B is main the support, and upstream face is arranged horizontal beam 3, reed curtain 16, film cloth 4, and the framework outside adds diagonal brace 2 and bottom girder 19 increases stable.Be provided with fore shaft beam 5 at framework upper.This form of structure is limited to can not play staking out and maybe can't beat under the situation of staking out and use in the river course.
Embodiment 6: the application of pile film cofferdam of the present invention in going into river building facilities construction
Go into the river building facilities and experience, the engineering of executing and preparing to accept, mainly contain various pipe culverts, Fang Han, box culvert, lock and cross a river bridge pier etc. from us.Pile film cofferdam A is used for separating river and the river course work plane of going into river building facilities shared necessity in construction, and it is a sealing space enclosing structure.According to the requirement of river management, adopt " L " type shop film of embodiment 1 one-sided pile film cofferdam.What the elder brother who has completed at present went in beautiful 14 in river estuarine works and connect the Liangma river engineering design at the Chaoyang Park exit sluice of executing is exactly one-sided piling bar film cofferdam.See Figure 10.
Embodiment 7: the application of pile film cofferdam in three tame shop reservoir desiltings
Three tame shop reservoir desiltings require to carry out under the situation of emptying storehouse water, but must guarantee Shijingshan, downstream power plant, high well power plant, the 3.5m of Shoudu Iron and Steel Co power plant
3The water supply of/s, for this reason, we have designed diversion aqueduct as Figure 11 according to the principle of pile film cofferdam in the reservoir area, the upstream, reservoir area is delivered to downstream power plant as required.286.355 meters of diversion aqueduct total lengths, wide 4.0 meters, high 1.6 meters, longitudinal gradient
5/
10000Any problem does not appear in diversion aqueduct between the whole service operating period, the water flow minimum is 2.5m
3/ s is 5.2m to the maximum
3/ s.
Embodiment 8: the application of two pile film cofferdams
Pile film cofferdam in the past all is no more than the 2.5m design by the depth of water, when the depth of water during greater than 2.5m, should adopt two pile film cofferdams (referring to Figure 12), we have adopted this cofferdam section in 109 national highway highway engineerings that completed (Feng Sha railway--cement plant ,-three tame shops section) and the sixth ring road engineering.
The long 400m in cofferdam, dash height 3.5m.Main material comprises two row's steel staking outs 1, shelf pipe horizontal beam 3, reed curtain 16, high-strength and waterproofing film cloth 4, presser feet sand pocket 6.In the construction, the spacing of two row's steel pipe staking outs is 2m, makes stull 26 and diagonal brace 25 with the shelf pipe in the middle of two row's steel pipe staking outs 1, and is fastening with fastener.Suitably lay plank in the stull 26 of 1 of two row's steel pipe staking out, can be used as People's Bank of China's suspension bridge, be used for upkeep operation before the weir, other job practices is with the single pile cofferdam.At the cofferdam run duration, stable and leakage problems do not appear, be subjected to the consistent favorable comment of how tame units such as owner, management and design.
From proposition, development and the practical application of the above-mentioned pile film cofferdam that we speak of, the form of pile film cofferdam is diversified as can be seen, and end is got up, and following several form is arranged.
(1) distinguish according to the difference of pile material:
1. the timber film cofferdam is determined the long and stake footpath of stake according to the depth of water and embedded depth.
2. the piling bar film cofferdam selects for use 6 cun steel pipes comparatively suitable, determines that according to the depth of water and embedded depth stake is long.
3. be with the piling bar film cofferdam of " shoe ".
4. steel frame pile film cofferdam (framework replacement staking out) is selected suitable steel and form of structure according to the depth of water.
(2) distinguish according to the difference of film cloth material:
1. polyethylene dual coating paulin cofferdam.Waterproof film cloth is generally the thick polyethylene coating paulin of 0.35～0.48mm.
2. geomembrane cofferdam.(monofilm, a cloth one film, two cloth, one film, thickness 0.1～1.0mm)
3. colour bar cloth cofferdam.(generally will use two layers)
(3) stablize the different differentiations of force way according to staking out:
1. the formula of towing cofferdam (one-sided cofferdam).By tow will be provided with on the slope, river stake be connected with the pile film cofferdam staking out, utilize the pulling force of staking out is offset head and act on horizontal thrust on the cofferdam on the slope, river.
2. diagonal-bracing type cofferdam (one-sided cofferdam).Utilize diagonal brace that the horizontal thrust of head in the staking out is transformed into the river bed.
3. to pull-type cofferdam (in lead the cofferdam, go up to drawing, up and down simultaneously to drawing).Utilization is born the horizontal thrust in cofferdam to drawing reinforcing bar.
4. draw outer support convolution cofferdam (in lead the cofferdam) in.
(4) according to the difference differentiation of beam downstream:
1. timber plate girder cofferdam.Do not establish beam downstream, water pressure directly passes in the staking out by plank.
2. horizontal distribution beam cofferdam.The staking out upstream face is established the horizontal distribution beam, encrypts gradually from top to bottom, generally adopts rectangle square steel or shelf pipe.Hang reed curtain, steel sheet or multi-plywood etc. in the spreader beam.
(5) divide according to row's number of stake is different:
1. single pile film cofferdam.
2. two pile film cofferdams.
The construction process of pile film cofferdam of the present invention should be noted when implementing:
The fore shaft beam colligation is with playing staking out, with fore shaft beam is fixed.
Horizontal beam is installed when in shallow water operations, manually directly colligation of horizontal beam; When at deepwater work, horizontal beam employing suspension ring or suspension hook are in place, install from bottom to top, and suspension ring or suspension hook length are the distance of every layer of horizontal beam apart from fore shaft beam, determine according to the depth of water and mechanical calculation.
The bag of pressing, cod adopts sand pocket that film cloth is pressed the end, edge sealing, adopts Pig to press and establishes the upright seam of film cloth.
The Technological Economy of pile film cofferdam of the present invention and turf cofferdam compares:
Stake film, turf cofferdam Technological Economy comparison sheet (depth of water=2.5 meter)
| Sequence number | Project | Stake film (middle water guide stream) | Sward (limit water guide stream) |
| 1 | The cross-section of river | A=35 square metre | A=23 |
| 2 | Tear open and build comprehensive cost | 491.18 unit/rice | 925.7 unit/ |
| 3 | The linear meter(lin.m.) |
7 work days | 15 |
| 4 | Displacement | Less | More |
| 5 | Turnover frequency | Main steel can have enough to meet the need 8～10 times | Almost there is not |
| 6 | Ambient influnence | Pollute little to water in a canal, two sides | Pollute big to water in a canal, two sides; Big with the soil amount, be difficult to satisfy; The band shipwreck is with thorough dismounting. |
| 7 | Construction period water level control degree | Comparatively loose | Comparatively strict, difficulty of construction is very big when h＞2 meter |
| 8 | The construction complexity | Complicated | Simpler |
| Sequence number | Project | Stake film (middle water guide stream) | Sward (limit water guide stream) |
| 9 | Discharge capacity | Reduce roughness, discharge capacity is strong | Strengthen roughness, discharge capacity is low |
By last table, we are not difficult to find out that pile film cofferdam still all is being superior to turf cofferdam on the technical-economic index greatly on to water environment and influence from social surroundings, are that we should promote the engineering that development is used.
Claims (12)
1. a pile film cofferdam comprises supporting component, waterproof film cloth and sandbag, and waterproof film cloth is layed in the upstream face and the bottom of supporting component, and forming the cross section is L shaped weir body; On the waterproof film cloth that is positioned on the described bottom, also be placed with described sandbag, be used for flanging, tooled joint and presser feet waterproof film cloth; Described supporting component comprises staking out, horizontal beam, film cloth bed course and is located at strengthening mechanism in the described staking out, the described bottom is inserted in the lower end of this staking out, it is characterized in that: hang the pressure that described sandbag is used for the upright seam of connection of upstream face waterproof film cloth and establish being positioned at described supporting component top; Described supporting component also comprises the fore shaft beam that is connected between each described staking out top.
2. pile film cofferdam according to claim 1 is characterized in that: described film cloth bed course is reed curtain, template or the steel bat that is made of square steel skeleton and steel sheet.
3. pile film cofferdam according to claim 1 is characterized in that: described strengthening mechanism is to be supported on the bottom of described back side and the diagonal brace between the staking out.
4. pile film cofferdam according to claim 1 is characterized in that: described strengthening mechanism is the pull bar and the turnbuckle that is connected on this pull bar that is connected between staking out top and the embankment.
5. pile film cofferdam according to claim 1, it is characterized in that: described supporting component is two covers and is oppositely arranged, and with described water-bed to constitute the cross section be U type structure, being equipped with described waterproof film cloth at the upstream face of this U type structure, to constitute the cross section be the cofferdam of U type; Described strengthening mechanism is to be connected the pull bar between the staking out top, both sides or/and be connected diagonal brace between the both sides staking out and the bottom.
6. pile film cofferdam according to claim 5 is characterized in that: be connected with bottom girder in the staking out of described both sides between the bottom place; The two ends of described bottom girder all prolong to the described staking out outside, are provided with diagonal brace between extended end and described staking out.
7. according to any one described pile film cofferdam of claim 1～6, it is characterized in that: described staking out is pin or steel pipe pile, and the bottom as described is the concrete substrate, is embedded in the staking out sleeve pipe at concrete, and insert in this staking out sleeve pipe the lower end of described staking out.
8. according to any one described pile film cofferdam of claim 1～6, it is characterized in that: described staking out is pin or steel pipe pile, and the lower end is provided with the most advanced and sophisticated bottom of directly inserting.
9. pile film cofferdam according to claim 1 is characterized in that: described waterproof film cloth adopts the polyvinyl chloride paulin, and paulin divides high-strength and moderate strength.
10. pile film cofferdam according to claim 1 is characterized in that: described staking out is provided with two rows, all is provided with horizontal beam in every row's staking out; Between described two row's staking outs, be connected with stull and diagonal brace reinforcing.
11. the job practices of pile film cofferdam according to claim 1, it is characterized in that: comprise following flow process: play staking out → fore shaft beam colligation → beat diagonal brace → horizontal beam installation → extension reed curtain or steel bat → spread film against the current, finish the end-blocking head weir → bag → row's precipitation of pressing, cod → cofferdam simultaneously and reinforce.
12. the job practices of pile film cofferdam according to claim 11 is characterized in that: describedly play staking out and carry out behind smooth river bed, staking out can be a timber, also can be steel pipe pile, needs according to the engineering concrete condition selected; According to pre-set stake position, utilize pontoon manually to beat timber downstream during construction, also can utilize pile driver to make piling bar;
When carrying out described fore shaft beam colligation, with playing staking out, with the fore shaft beam colligation is fixed;
Described horizontal beam is installed: when in shallow water operations, and manually directly colligation of horizontal beam; When at deepwater work, horizontal beam employing suspension ring or suspension hook are in place, install from bottom to top, and suspension ring or suspension hook length are the distance of every layer of horizontal beam apart from fore shaft beam, determine according to the depth of water and mechanical calculation;
Described film cloth bed course is installed: when the depth of water during less than 2m, do the force structure layer with common reed curtain or sorghum bar; When the depth of water during, adopt special reed curtain or steel form, steel bat to do the force structure layer greater than 2m;
Described shop film: at upstream face shop film,, use on the fore shaft beam that pontoon is fixed on the top with a side or the bilateral of film cloth against the current, allow film cloth bubble through the water column according to dash form branch " L " type and " U " type; After vertical suitable for reading being completely fixed of a film cloth, earlier the film cloth with the upstream is pressed onto accurate position, river bed, utilizes streaming potential pressure moment that film cloth is completed, and promptly " spreads film against the current "; After a film cloth is completed, guarantee again to re-lay next piece film cloth under the situation that lap length requires;
Described pressure, the bag of codding: adopt sand pocket that film cloth is pressed the end, edge sealing, adopt Pig to press and establish the upright seam of film cloth;
Described cofferdam reinforces: after the cofferdam installs, back side water is extracted out, reinforced horizontal beam, reed curtain or steel bat from top to bottom; If normally then continue stabilization by drainage, if occur then stopping to arrange precipitation unusually, the laggard line correlation item of voltage stabilizing is handled.
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| CN2008101167656A CN101333818B (en) | 2008-07-17 | 2008-07-17 | Pile film cofferdam and its construction method |
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| CN2008101167656A CN101333818B (en) | 2008-07-17 | 2008-07-17 | Pile film cofferdam and its construction method |
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| CN101333818B true CN101333818B (en) | 2010-11-03 |
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| CN111021382A (en) * | 2019-12-30 | 2020-04-17 | 中建水务环保有限公司 | Pile film cofferdam structure for reducing revetment deformation and construction method thereof |
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Effective date of registration: 20090515 Address after: Beijing, Haidian District, Qing Henan, North Binhe Road East, postcode: 100192 Applicant after: Beijing Xiang Kun Water Construction Co., Ltd. Co-applicant after: Beijing Urban & Rural Construction Group Co.,Ltd. Address before: Beijing, Haidian District, Qing Henan, North Binhe Road East, postcode: 100192 Applicant before: Beijing Xiangkun Water Conservancy Project Co., Ltd. |
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Address after: 100192 Qinghe Road, Haidian District, Beijing 191 Co-patentee after: Beijing Urban & Rural Construction Group Co.,Ltd. Patentee after: Beijing Xiangkun Water Conservancy Project Co., Ltd. Address before: 100192 Beijing Haidian District Henan town north riverside East Road Co-patentee before: Beijing Urban & Rural Construction Group Co.,Ltd. Patentee before: Beijing Xiangkun Water Conservancy Project Co., Ltd. |