CN106284081A - A kind of blast cofferdam is as cast-in-place box beam bracket foundation construction method - Google Patents
A kind of blast cofferdam is as cast-in-place box beam bracket foundation construction method Download PDFInfo
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- CN106284081A CN106284081A CN201610656590.2A CN201610656590A CN106284081A CN 106284081 A CN106284081 A CN 106284081A CN 201610656590 A CN201610656590 A CN 201610656590A CN 106284081 A CN106284081 A CN 106284081A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a kind of blast cofferdam as cast-in-place box beam bracket foundation construction method, for construction of cast-in-situ box-beam, comprise the following steps: (1) preparation of construction；(2) clear base, laying geotechnique's soft raft；(3) filling dike heart sand pocket and geotextile tube bag: after soft raft is laid, first carries out soft raft cleaning and puts down, then carry out filling bag working procedure, and the construction of filling bag is divided into filling dike heart sand pocket and filling geotextile tube bag sand；(4) hydraulic fill sand in cofferdam: sand filling bag fill is constructed and i.e. carried out the filling of dike heart sand after certain quantities, two incline bodies and dike heart loose sand is parallel constructs；(5) draining compacting；(6) paving mountain skin stone；(7) casting concrete forms bracket basis.The inventive method step is simple, easy construction, safe and environment-friendly, settle the features such as little, and can ensure that bridge box and beam structural linetype meets design and code requirement.
Description
Technical field
The present invention relates to bridge cast-in-situ box-beam rack construction technical field, specifically a kind of blast cofferdam is as cast-in-situ box girder
Bracket basis construction method.
Background technology
At present, on the water in the construction of bridge cast-in-situ box-beam, typically use and in water, set the method for steel-pipe pile as case
The basis of boom support construction, uses that the method difficulty of construction is big, complex process and to remove difficulty big.Therefore, one need to be designed
Method step is simple, easy construction, the sedimentation bracket basis removed little, readily removable.
Summary of the invention
It is an object of the invention to provide a kind of blast cofferdam as cast-in-place box beam bracket foundation construction method, its method walks
Rapid simple, easy construction, sedimentation is little, readily removable removes, and can complete the construction of bracket basis more quickly, can solve existing construction method
The problems such as the difficulty of construction existed is big, complex process, dismounting difficulty are big.
For achieving the above object, the present invention provides following technical scheme:
A kind of blast cofferdam, as cast-in-place box beam bracket foundation construction method, comprises the following steps:
Step one, survey crew measure location to plan-position and the elevation in sand pocket cofferdam；
Before step 2, soft raft are laid, GPS navigation alignment system measure location, be found to have sharp shaped material and take immediately to arrange
Execute and process, it is ensured that isostere is not damaged by, behind location, laid to the position specified by manually taking advantage of low tide, and in time with blowing
The mud pump set filling sand rib being equipped with on sand ship, prevents soft raft from being washed open by current and wave, charging port is tightened when blowing full；
The filler of sand rib fills rate and is preferably 80%～90%；The lap of splice of adjacent two pieces of soft rafts, underwater construction is not less than 2000mm, water
Upper construction is not less than 1000mm；
After step 3, soft raft are laid, first carry out soft raft cleaning and put down, then carry out filling bag construction；Filling bag is executed
Work point is filling dike heart sand pocket and filling geotextile tube bag；Behind sand carrier location, install slush pump, utilize pumping for water pump sand washing,
Open slush pump by sand aqueous mixtures by being arranged in the sand pocket that the cuff on bag surface is evacuated to place and sealing, every
Filling the length 30～34m of sand pocket, width is configured according to construction requirement, and cuff quantity is by 8～12m layout 1；Filling procedure
According to filling, the slurry that spouts, secondary filling, manually trample, in bag sand thickness meet design require order carry out, bag filling satisfy
Full scale controls 80%, it is ensured that fill sand flat whole, tamp, successively increase；When filling sand pocket, mortar is drainage in filling bag, limit drainage
While rush in mortar, discharging consolidation forms sand pillow；In view of sand pocket length is difficult to once to be formed sand pillow, whole piece sand pocket by three to four sections by
Section is taken out sand and is become pillow, and due to the inhomogeneities of sand pocket blast discharging consolidation, need to backwash sand pocket inner fovea part sand, whole to guarantee
The uniformity of the sand pillow of body；Sand rib is laid complete immediately to the follow-up construction of ground floor bagged sand rib body；Ground floor sand pocket spreads
If time lay in strict accordance with surveying and locating line, the heap of large-scale sand pocket builds and pushes ahead in notch cuttype, upper and lower two interlayers and adjacent sand
The overlap joint of bag needs more than 1m, in case forming straight joint；The construction of next layer is carried out immediately after completing one layer；For guaranteeing cofferdam levee body
Safety, discharges moisture in bagged sand rib body, and layering was constructed, between ground floor and second layer bagged sand rib body filling engineering time
It is as the criterion every reaching 70% with the ground floor bagged sand degree of consolidation, forbids levels to construct continuously；Outside cofferdam, the gradient is 1:1.5, the interior gradient
For 1:1；Outer slope geotextile tube bag packed height 0.8～1.2m, width 3m, dike heart sand filling bag height 0.4～0.6m, width 2～
12m；Geotextile tube bag when brick work outside upstream face draw according to the gradient of 1:1.5, so circulation is until designed elevation, paving
If after Hao, outside end face, surrounding width requirement is 3m；
The filling of dike heart loose sand, two incline bodies and the dike heart is i.e. carried out after step 4, the sand filling bag fill certain quantities of construction
Loose sand wants parallel construction；
Step 5, draining compacting: in the range of the hydraulic reclamation of cofferdam, dig a dell every 100m, cheat deep 1.8～2.2m, use water pump
Draw water, after water drains, be compacted with crawler type road roller；
Step 6, paving mountain skin stone: in cofferdam, loose sand discharging consolidation completes and after grinding compacting, making on sandy soils in cofferdam
30cm thickness mountain skin stone；
Step 7, smooth until mountain skin stone grinding compacting and meet design strength require after, mountain skin stone pours 10cm thickness C20 mix
Solidifying soil layer, so far, the basis formation of blast cofferdam district cast-in-situ box girder full framing.
As the further scheme of the present invention: the isostere material of soft raft described in step 2 uses TR600-120PP to split
Film silk longitude and latitude uses 150g/ polypropylene woven cloth with strong woven geotextile, sand rib, and reinforced bands 5cm width, the polypropylene of 50g/m add
Rib tape, reinforced bands sewing is used for fixing sand rib on soft raft.
As the present invention further scheme: the sand filled in step 3 is sea sand, its clay content is less than 10%, grain
The footpath content more than 0.075mm is more than 80%.
As the present invention further scheme: the heart sand pocket of filling dike described in step 3 uses age inhibiting braiding geotechnique
Cloth.
As the present invention further scheme: geotextile tube bag described in step 3 uses high intensity, freeze thawing resistance, anti-aging
Polypropylene burst film yarn-woven geotextile.
As the present invention further scheme: the sewing of described geotextile tube bag requires to use butterfly-type method of sewing, seam
To be placed on the bottom surface of bag as far as possible, suture anti-aging to be used split yarn line or anti-aging polyester thread, suture strength however be less than
25kg/m。
As the present invention further scheme: the hydraulic reclamation of the loose sand of the dike heart described in step 4 uses a blast ship
232kw, two sand carriers, three slush pump 20kw, three sand aqueous mixtures conveying rubber flexible pipe Φ 200 and six water under high pressures
Rifle, every slush pump needs two giants to coordinate.
As the present invention further scheme: the draining compacting described in step 5, compacting rate controls more than 95%.
Compared with prior art, the invention has the beneficial effects as follows:
(1) method step is simple, easy construction, sedimentation is little, readily removable removes；
(2) using effect is good and practical value high.Using blast cofferdam as cast-in-place box beam bracket basis, utilization ratio is high, warp
Actual measurement, within 2 years, cumulative settling is within 1cm, and when constructing upper tank girder construction, sedimentation tends towards stability, for top box girder construction
Have laid a good foundation.Compared with fulcrum support few with traditional water, use blast cofferdam as the base of cast-in-place box beam bracket
Plinth, good economy performance, and value are high, and bridge is the most available to Superstructure Construction overall process from substructure, lower junction
During structure construction, blast cofferdam can be as Pile Installation Platform, and during Superstructure Construction, blast cofferdam can be as cast-in-place box beam bracket
Basis.
Accompanying drawing explanation
Fig. 1 is the blast cofferdam FB(flow block) as cast-in-place box beam bracket foundation construction method.
Fig. 2 is that blast cofferdam is as the transverse section signal watering box beam bracket basis in cast-in-place box beam bracket foundation construction method
Figure.
In figure: 1-soft raft, 2-sand rib, 3-geotextile tube bag, the 4-dike heart fills sand pocket, 5-dike heart loose sand, 6-mountain skin stone, 7-
C20 concrete layer.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
Embodiment 1
Refer to Fig. 1～2, in the embodiment of the present invention, a kind of blast cofferdam as cast-in-place box beam bracket foundation construction method, including
Following steps:
Step one, survey crew measure location to plan-position and the elevation in sand pocket cofferdam；
Before step 2, soft raft 1 are laid, GPS navigation alignment system measure location, be found to have sharp shaped material and take immediately to arrange
Execute and process, it is ensured that isostere is not damaged by, behind location, laid to the position specified by manually taking advantage of low tide, and in time with blowing
The mud pump set filling sand rib 2 being equipped with on sand ship, prevents soft raft 1 from being washed open by current and wave, charging port is pricked when blowing full
Tightly；It is 80% that the filler of sand rib 2 fills rate；The lap of splice of adjacent two pieces of soft rafts 1, underwater construction is not less than 2000mm, waterborne
Construction is not less than 1000mm；
After step 3, soft raft 1 are laid, first carry out soft raft 1 cleaning and put down, then carry out filling bag construction；Filling bag
Construction is divided into filling dike heart sand pocket 4 and filling geotextile tube bag 3；Behind sand carrier location, install slush pump, utilize pumping for water pump to rush
Sand, opens slush pump by sand aqueous mixtures by being arranged in the sand pocket that the cuff on bag surface is evacuated to place and sealing,
Every length 30m filling sand pocket, width is configured according to construction requirement, and cuff quantity is pressed 8m and arranged 1；Filling procedure according to
Filling, the slurry that spouts, secondary filling, manually trampling, in bag, sand thickness meets the order that design requires and carries out, bag filling plumpness
Control 80%, it is ensured that fill sand flat whole, tamp, successively increase；When filling sand pocket, mortar is drainage in filling bag, and drainage limit, limit rushes
Entering mortar, discharging consolidation forms sand pillow；In view of sand pocket longer (30m), it is difficult to once form sand pillow, whole piece sand pocket presses three to four sections
Taking out sand piecemeal and become pillow, due to the inhomogeneities of sand pocket blast discharging consolidation, need to backwash sand pocket inner fovea part sand, to guarantee
The uniformity of overall sand pillow；Sand rib is laid complete immediately to the follow-up construction of ground floor bagged sand rib body；Ground floor sand pocket is carried out
Laying in strict accordance with surveying and locating line during laying, the heap of large-scale sand pocket builds and pushes ahead in notch cuttype, upper and lower two interlayers and adjacent
The overlap joint of sand pocket needs more than 1m, in case forming straight joint；The construction of next layer is carried out immediately after completing one layer；For guaranteeing cofferdam dike
Body safety, discharges moisture in bagged sand rib body, it is necessary to layering is constructed, ground floor and the construction of second layer bagged sand rib body filling
Time interval reaches 70% with the ground floor bagged sand degree of consolidation and is as the criterion, and forbids levels to construct continuously；Outside cofferdam, the gradient is 1:1.5,
The interior gradient is 1:1；Outer slope geotextile tube bag 3 packed height 0.8m, width 3m, dike heart sand filling bag 4 height 0.4m, width 2m；Soil
Work pipe bag 3 when brick work outside (upstream face) draw according to the gradient of 1:1.5, so circulation is until designed elevation, lays
After Hao, outside end face, surrounding width requirement is 3m；
The filling of dike heart loose sand 5, two incline bodies and the dike heart is i.e. carried out after step 4, the sand filling bag fill certain quantities of construction
Loose sand 5 wants parallel construction；
Step 5, draining compacting: in the range of the hydraulic reclamation of cofferdam, dig a dell (cheating deep 1.8m) every 100m and take out with water pump
Water, after water drains, is compacted with crawler type road roller；
Step 6, paving mountain skin stone 6: in cofferdam, loose sand discharging consolidation completes and after grinding compacting, making on sandy soils in cofferdam
30cm thickness mountain skin stone 6；
Step 7, smooth until mountain skin stone grinding compacting and meet design strength require after, mountain skin stone pours 10cm thickness C20 mix
Solidifying soil layer 7, so far, the basis formation of blast cofferdam district cast-in-situ box girder full framing.
The isostere material of soft raft described in step 2 use TR600-120PP split yarn longitude and latitude with strong woven geotextile,
Sand rib uses 150g/ polypropylene woven cloth, reinforced bands 5cm width, the polypropylene reinforced bands of 50g/m, and reinforced bands sews at soft raft
On be used for fixing sand rib.
In the present embodiment, the sand filled in step 3 is sea sand, and its clay content is less than 10%, and particle diameter is more than 0.075mm's
Content is more than 80%；The heart sand pocket of filling dike described in step 3 uses age inhibiting braided geotextile；Geotextile tube described in step 3
Bag uses high intensity, freeze thawing resistance, age inhibiting polypropylene burst film yarn-woven geotextile, and the sewing of described geotextile tube bag requires to use
Butterfly-type method of sewing, seam to be placed on the bottom surface of bag as far as possible, suture anti-aging to be used split yarn line or anti-aging polyester thread,
Suture strength however less than 25kg/m.
In the present embodiment, hydraulic reclamation one blast ship 232kw of employing of the loose sand of the dike heart described in step 4, two sand carriers,
Three slush pump 20kw, three sand aqueous mixtures conveying rubber flexible pipe Φ 200 and six giants, every slush pump needs two
Bar giant coordinates.
In the present embodiment, the draining compacting described in step 5, compacting rate controls more than 95%.
Embodiment 2
Refer to Fig. 1～2, in the embodiment of the present invention, a kind of blast cofferdam as cast-in-place box beam bracket foundation construction method, including
Following steps:
Step one, survey crew measure location to plan-position and the elevation in sand pocket cofferdam；
Before step 2, soft raft 1 are laid, GPS navigation alignment system measure location, be found to have sharp shaped material and take immediately to arrange
Execute and process, it is ensured that isostere is not damaged by, behind location, laid to the position specified by manually taking advantage of low tide, and in time with blowing
The mud pump set filling sand rib 2 being equipped with on sand ship, prevents soft raft 1 from being washed open by current and wave, charging port is pricked when blowing full
Tightly；The filler of sand rib 2 fills rate and is preferably 85%；The lap of splice of adjacent two pieces of soft rafts 1, underwater construction is not less than 2000mm, water
Upper construction is not less than 1000mm；
After step 3, soft raft 1 are laid, first carry out soft raft 1 cleaning and put down, then carry out filling bag construction；Filling bag
Construction is divided into filling dike heart sand pocket 4 and filling geotextile tube bag 3；Behind sand carrier location, install slush pump, utilize pumping for water pump to rush
Sand, opens slush pump by sand aqueous mixtures by being arranged in the sand pocket that the cuff on bag surface is evacuated to place and sealing,
Every length 32m filling sand pocket, width is configured according to construction requirement, and cuff quantity is pressed 10m and arranged 1；Filling procedure is pressed
According to filling, the slurry that spouts, secondary filling, manually trample, in bag sand thickness meet design require order carry out, bag filling is full
Degree control 80%, it is ensured that fill sand flat whole, tamp, successively increase；When filling sand pocket, mortar is drainage in filling bag, drainage limit, limit
Rushing in mortar, discharging consolidation forms sand pillow；In view of sand pocket longer (32m), it is difficult to once form sand pillow, whole piece sand pocket presses three to four
Section is taken out sand piecemeal and is become pillow, and due to the inhomogeneities of sand pocket blast discharging consolidation, need to backwash sand pocket inner fovea part sand, with really
Protect the uniformity of overall sand pillow；Sand rib is laid complete immediately to the follow-up construction of ground floor bagged sand rib body；Ground floor sand pocket enters
Laying in strict accordance with surveying and locating line when row is laid, the heap of large-scale sand pocket is built and is pushed ahead in notch cuttype, upper and lower two interlayers and phase
The overlap joint of adjacent sand pocket needs more than 1m, in case forming straight joint；The construction of next layer is carried out immediately after completing one layer；For guaranteeing cofferdam
Levee body safety, discharges moisture in bagged sand rib body, it is necessary to layering is constructed, and ground floor and second layer bagged sand rib body filling are executed
Work time interval reaches 70% with the ground floor bagged sand degree of consolidation and is as the criterion, and forbids levels to construct continuously；Outside cofferdam, the gradient is 1:
1.5, the interior gradient is 1:1；Outer slope geotextile tube bag 3 packed height 1.0m, width 3m, dike heart sand filling bag 4 height 0.5m, width
7m；Geotextile tube bag 3 when brick work outside (upstream face) draw according to the gradient of 1:1.5, so circulation until designed elevation,
After laying, outside end face, surrounding width requirement is 3m；
The filling of dike heart loose sand 5, two incline bodies and the dike heart is i.e. carried out after step 4, the sand filling bag fill certain quantities of construction
Loose sand 5 wants parallel construction；
Step 5, draining compacting: in the range of the hydraulic reclamation of cofferdam, dig a dell (cheating deep 2m) every 100m and take out with water pump
Water, after water drains, is compacted with crawler type road roller；
Step 6, paving mountain skin stone 6: in cofferdam, loose sand discharging consolidation completes and after grinding compacting, making on sandy soils in cofferdam
30cm thickness mountain skin stone 6；
Step 7, smooth until mountain skin stone grinding compacting and meet design strength require after, mountain skin stone pours 10cm thickness C20 mix
Solidifying soil layer 7, so far, the basis formation of blast cofferdam district cast-in-situ box girder full framing.
In the present embodiment, the sand filled in step 3 is sea sand, and its clay content is less than 10%, and particle diameter is more than 0.075mm's
Content is more than 80%；The heart sand pocket of filling dike described in step 3 uses age inhibiting braided geotextile；Geotextile tube described in step 3
Bag uses high intensity, freeze thawing resistance, age inhibiting polypropylene burst film yarn-woven geotextile, and the sewing of described geotextile tube bag requires to use
Butterfly-type method of sewing, seam to be placed on the bottom surface of bag as far as possible, suture anti-aging to be used split yarn line or anti-aging polyester thread,
Suture strength however less than 25kg/m.
In the present embodiment, hydraulic reclamation one blast ship 232kw of employing of the loose sand of the dike heart described in step 4, two sand carriers,
Three slush pump 20kw, three sand aqueous mixtures conveying rubber flexible pipe Φ 200 and six giants, every slush pump needs two
Bar giant coordinates.
In the present embodiment, the draining compacting described in step 5, compacting rate controls more than 95%.
Embodiment 3
Refer to Fig. 1～2, in the embodiment of the present invention, a kind of blast cofferdam as cast-in-place box beam bracket foundation construction method, including
Following steps:
Step one, survey crew measure location to plan-position and the elevation in sand pocket cofferdam；
Before step 2, soft raft 1 are laid, GPS navigation alignment system measure location, be found to have sharp shaped material and take immediately to arrange
Execute and process, it is ensured that isostere is not damaged by, behind location, laid to the position specified by manually taking advantage of low tide, and in time with blowing
The mud pump set filling sand rib 2 being equipped with on sand ship, prevents soft raft 1 from being washed open by current and wave, charging port is pricked when blowing full
Tightly；The filler of sand rib 2 fills rate and is preferably 90%；The lap of splice of adjacent two pieces of soft rafts 1, underwater construction is not less than 2000mm, water
Upper construction is not less than 1000mm；
After step 3, soft raft 1 are laid, first carry out soft raft 1 cleaning and put down, then carry out filling bag construction；Filling bag
Construction is divided into filling dike heart sand pocket 4 and filling geotextile tube bag 3；Behind sand carrier location, install slush pump, utilize pumping for water pump to rush
Sand, opens slush pump by sand aqueous mixtures by being arranged in the sand pocket that the cuff on bag surface is evacuated to place and sealing,
Every length 34m filling sand pocket, width is configured according to construction requirement, and cuff quantity is pressed 12m and arranged 1；Filling procedure is pressed
According to filling, the slurry that spouts, secondary filling, manually trample, in bag sand thickness meet design require order carry out, bag filling is full
Degree control 80%, it is ensured that fill sand flat whole, tamp, successively increase；When filling sand pocket, mortar is drainage in filling bag, drainage limit, limit
Rushing in mortar, discharging consolidation forms sand pillow；In view of sand pocket longer (34m), it is difficult to once form sand pillow, whole piece sand pocket presses three to four
Section is taken out sand piecemeal and is become pillow, and due to the inhomogeneities of sand pocket blast discharging consolidation, need to backwash sand pocket inner fovea part sand, with really
Protect the uniformity of overall sand pillow；Sand rib is laid complete immediately to the follow-up construction of ground floor bagged sand rib body；Ground floor sand pocket enters
Laying in strict accordance with surveying and locating line when row is laid, the heap of large-scale sand pocket is built and is pushed ahead in notch cuttype, upper and lower two interlayers and phase
The overlap joint of adjacent sand pocket needs more than 1m, in case forming straight joint；The construction of next layer is carried out immediately after completing one layer；For guaranteeing cofferdam
Levee body safety, discharges moisture in bagged sand rib body, it is necessary to layering is constructed, and ground floor and second layer bagged sand rib body filling are executed
Work time interval reaches 70% with the ground floor bagged sand degree of consolidation and is as the criterion, and forbids levels to construct continuously；Outside cofferdam, the gradient is 1:
1.5, the interior gradient is 1:1；Outer slope geotextile tube bag 3 packed height 1.2m, width 3m, dike heart sand filling bag 4 height 0.6m, width
12m；Geotextile tube bag 3 when brick work outside (upstream face) draw according to the gradient of 1:1.5, so circulation is until design mark
Height, after laying, outside end face, surrounding width requirement is 3m；
The filling of dike heart loose sand 5, two incline bodies and the dike heart is i.e. carried out after step 4, the sand filling bag fill certain quantities of construction
Loose sand 5 wants parallel construction；
Step 5, draining compacting: in the range of the hydraulic reclamation of cofferdam, dig a dell (cheating deep 2.2m) every 100m and take out with water pump
Water, after water drains, is compacted with crawler type road roller；
Step 6, paving mountain skin stone 6: in cofferdam, loose sand discharging consolidation completes and after grinding compacting, making on sandy soils in cofferdam
30cm thickness mountain skin stone 6；
Step 7, smooth until mountain skin stone grinding compacting and meet design strength require after, mountain skin stone pours 10cm thickness C20 mix
Solidifying soil layer 7, so far, the basis formation of blast cofferdam district cast-in-situ box girder full framing.
In the present embodiment, the sand filled in step 3 is sea sand, and its clay content is less than 10%, and particle diameter is more than 0.075mm's
Content is more than 80%；The heart sand pocket of filling dike described in step 3 uses age inhibiting braided geotextile；Geotextile tube described in step 3
Bag uses high intensity, freeze thawing resistance, age inhibiting polypropylene burst film yarn-woven geotextile, and the sewing of described geotextile tube bag requires to use
Butterfly-type method of sewing, seam to be placed on the bottom surface of bag as far as possible, suture anti-aging to be used split yarn line or anti-aging polyester thread,
Suture strength however less than 25kg/m.
In the present embodiment, hydraulic reclamation one blast ship 232kw of employing of the loose sand of the dike heart described in step 4, two sand carriers,
Three slush pump 20kw, three sand aqueous mixtures conveying rubber flexible pipe Φ 200 and six giants, every slush pump needs two
Bar giant coordinates.
In the present embodiment, the draining compacting described in step 5, compacting rate controls more than 95%.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of the spirit or essential attributes of the present invention, it is possible to realize the present invention in other specific forms.Therefore, no matter
From the point of view of which point, all should regard embodiment as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all by fall in the implication of equivalency and scope of claim
Change is included in the present invention.Should not be considered as limiting involved claim by any reference in claim.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only wraps
Containing an independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should
Description can also be formed those skilled in the art through appropriately combined as an entirety, the technical scheme in each embodiment
May be appreciated other embodiments.
Claims (8)
1. a blast cofferdam is as cast-in-place box beam bracket foundation construction method, it is characterised in that comprise the following steps:
Step one, survey crew measure location to plan-position and the elevation in sand pocket cofferdam；
Before step 2, soft raft are laid, GPS navigation alignment system measure location, be found to have sharp shaped material and take immediately to arrange
Execute and process, it is ensured that isostere is not damaged by, behind location, laid to the position specified by manually taking advantage of low tide, and in time with blowing
The mud pump set filling sand rib being equipped with on sand ship, prevents soft raft from being washed open by current and wave, charging port is tightened when blowing full；
The filler of sand rib fills rate and is preferably 80%～90%；The lap of splice of adjacent two pieces of soft rafts, underwater construction is not less than 2000mm, water
Upper construction is not less than 1000mm；
After step 3, soft raft are laid, first carry out soft raft cleaning and put down, then carry out filling bag construction；Filling bag is executed
Work point is filling dike heart sand pocket and filling geotextile tube bag；Behind sand carrier location, install slush pump, utilize pumping for water pump sand washing,
Open slush pump by sand aqueous mixtures by being arranged in the sand pocket that the cuff on bag surface is evacuated to place and sealing, every
Filling the length 30～34m of sand pocket, width is configured according to construction requirement, and cuff quantity is by 8～12m layout 1；Filling procedure
According to filling, the slurry that spouts, secondary filling, manually trample, in bag sand thickness meet design require order carry out, bag filling satisfy
Full scale controls 80%, it is ensured that fill sand flat whole, tamp, successively increase；When filling sand pocket, mortar is drainage in filling bag, limit drainage
While rush in mortar, discharging consolidation forms sand pillow；In view of sand pocket length is difficult to once to be formed sand pillow, whole piece sand pocket by three to four sections by
Section is taken out sand and is become pillow, and due to the inhomogeneities of sand pocket blast discharging consolidation, need to backwash sand pocket inner fovea part sand, whole to guarantee
The uniformity of the sand pillow of body；Sand rib is laid complete immediately to the follow-up construction of ground floor bagged sand rib body；Ground floor sand pocket spreads
If time lay in strict accordance with surveying and locating line, the heap of large-scale sand pocket builds and pushes ahead in notch cuttype, upper and lower two interlayers and adjacent sand
The overlap joint of bag needs more than 1m, in case forming straight joint；The construction of next layer is carried out immediately after completing one layer；For guaranteeing cofferdam levee body
Safety, discharges moisture in bagged sand rib body, and layering was constructed, between ground floor and second layer bagged sand rib body filling engineering time
It is as the criterion every reaching 70% with the ground floor bagged sand degree of consolidation, forbids levels to construct continuously；Outside cofferdam, the gradient is 1:1.5, the interior gradient
For 1:1；Outer slope geotextile tube bag packed height 0.8～1.2m, width 3m, dike heart sand filling bag height 0.4～0.6m, width 2～
12m；Geotextile tube bag when brick work outside upstream face draw according to the gradient of 1:1.5, so circulation is until designed elevation, paving
If after Hao, outside end face, surrounding width requirement is 3m；
The filling of dike heart loose sand, two incline bodies and the dike heart is i.e. carried out after step 4, the sand filling bag fill certain quantities of construction
Loose sand wants parallel construction；
Step 5, draining compacting: in the range of the hydraulic reclamation of cofferdam, dig a dell every 100m, cheat deep 1.8～2.2m, use water pump
Draw water, after water drains, be compacted with crawler type road roller；
Step 6, paving mountain skin stone: in cofferdam, loose sand discharging consolidation completes and after grinding compacting, making on sandy soils in cofferdam
30cm thickness mountain skin stone；
Step 7, smooth until mountain skin stone grinding compacting and meet design strength require after, mountain skin stone pours 10cm thickness C20 mix
Solidifying soil layer, so far, the basis formation of blast cofferdam district cast-in-situ box girder full framing.
Blast cofferdam the most according to claim 1 is as cast-in-place box beam bracket foundation construction method, it is characterised in that step
The isostere material of soft raft described in two uses TR600-120PP split yarn longitude and latitude to use 150g/ with strong woven geotextile, sand rib
Polypropylene woven cloth, reinforced bands 5cm width, the polypropylene reinforced bands of 50g/m, reinforced bands sewing is used for fixing sand on soft raft
Rib.
Blast cofferdam the most according to claim 1 is as cast-in-place box beam bracket foundation construction method, it is characterised in that step
The sand filled in three is sea sand, and its clay content is less than 10%, and the particle diameter content more than 0.075mm is more than 80%.
Blast cofferdam the most according to claim 1 is as cast-in-place box beam bracket foundation construction method, it is characterised in that step
The heart sand pocket of filling dike described in three uses age inhibiting braided geotextile.
Blast cofferdam the most according to claim 1 is as cast-in-place box beam bracket foundation construction method, it is characterised in that step
Geotextile tube bag described in three uses high intensity, freeze thawing resistance, age inhibiting polypropylene burst film yarn-woven geotextile.
Blast cofferdam the most according to claim 5 is as cast-in-place box beam bracket foundation construction method, it is characterised in that described
The sewing of geotextile tube bag requires to use butterfly-type method of sewing, and seam to be placed on the bottom surface of bag, suture anti-aging to be used as far as possible
Split yarn line or anti-aging polyester thread, suture strength otherwise less than 25kg/m.
Blast cofferdam the most according to claim 1 is as cast-in-place box beam bracket foundation construction method, it is characterised in that step
The hydraulic reclamation of the loose sand of the dike heart described in four uses a blast ship 232kw, two sand carriers, three slush pump 20kw, three sand water
Mixture conveying rubber flexible pipe Φ 200 and six giants, every slush pump needs two giants to coordinate.
Blast cofferdam the most according to claim 1 is as cast-in-place box beam bracket foundation construction method, it is characterised in that step
Draining compacting described in five, compacting rate controls more than 95%.
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| CN111042051A (en) * | 2019-12-30 | 2020-04-21 | 中建港航局集团有限公司 | Construction process of temporary flood prevention system |
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