CN102392458B - Piling beam cofferdam construction method used for bare rock foundation construction in water - Google Patents
Piling beam cofferdam construction method used for bare rock foundation construction in water Download PDFInfo
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- CN102392458B CN102392458B CN201110315026.1A CN201110315026A CN102392458B CN 102392458 B CN102392458 B CN 102392458B CN 201110315026 A CN201110315026 A CN 201110315026A CN 102392458 B CN102392458 B CN 102392458B
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Abstract
The invention discloses a piling beam cofferdam construction method used for bare rock foundation construction in water. The construction method provided by the invention is characterized in that the cofferdam is formed through multiple piling beams which are successively closely connected, the cofferdam is firmly embeded in the bare rock in water and the piling beam cofferdam is used for constructing a cushion cap foundation in water; the construction method comprises the following steps: firstly, determining cofferdam structural size and construction location; secondly, hole-drilling construction of an installing groove on cofferdam bottom: adopting impulse type drilling equipment to drill multiple occlusion drill holes and correspondingly forming the installing groove used for fixing the cofferdam bottom along the periphery of the cofferdam; thirdly, installing groove backfilling construction of the cofferdam bottom: adopting river sand to backfill the installing groove; and fourthly, cofferdam construction: carrying out inserting piling and fold construction on the multiple piling beams, and forming a close cofferdam after the fold. The construction method provided by the invention has the advantages of simple steps, lower construction cost, high construction efficiency and good construction effect, and solves the construction problem that the piling beam cofferdam can not be directly embed in a river bed of the bare rock.
Description
Technical field
The invention belongs to foundation construction technical field in water, especially relate to a kind of naked rock foundation construction steel sheet pile cofferdam construction method in water.
Background technology
Steel sheet-pile cofferdam is a kind of construction method conventional in bridge foundation construction, it has mainly utilized rigidity that steel sheet pile is stronger and good water proof function, for basis in water or the high excavation of foundation pit of groundwater table provide supporting, to realize constructor and equipment, in anhydrous cofferdam, carry out safety work.Actual while carrying out steel sheet pile cofferdam construction, the degree of depth that steel sheet pile embeds foundation ditch below ground is a greatest factor of the whole cofferdam of impact safety and stability, and steel sheet pile insert depth is more shallow, and cofferdam is more dangerous.And at naked rock river bed, especially in rock strength upper zone, steel sheet pile cannot also directly embed wherein by fractured rock, thereby make steel sheet pile lower end become free end, cannot guarantee the safety in whole cofferdam and stablize.Thereby traditional steel sheet-pile cofferdam can only be applied at soft stratum, in water, in naked rock river bed, cannot effectively be applied.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, a kind of naked rock foundation construction steel sheet pile cofferdam construction method in water is provided, its method step is simple, construction cost is lower, efficiency of construction is high and construction effect is good, has solved the construction difficult problem that steel sheet-pile cofferdam cannot directly embed naked rock river bed.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of naked rock foundation construction steel sheet pile cofferdam construction method in water, cofferdam used is surrounded by the steel sheet pile of multi-disc successively close proximity, described cofferdam is in fastening embedding water in naked rock and for the steel sheet-pile cofferdam on the underwater support table basis of constructing, and it is characterized in that the method comprises the following steps:
Step 1, cofferdam structure size and construction location are determined: according to structure, size and the construction location on need construction underwater support table basis, and working space that need be reserved during in conjunction with the riverbed geology of job location and hydrologic regime and cofferdam construction, structure, size, construction location and the bottom of determining described cofferdam embed the insert depth in naked rock in water, and according to the structure in determined cofferdam and size, determine quantity, size and the model of construction cofferdam single steel plate stake used; Afterwards, according to the construction location in determined cofferdam and adopt conventional over-water construction to measure line-putting method, the surrounding outline line in cofferdam is measured to setting-out;
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, it is characterized in that: before carrying out bottom, cofferdam mounting groove drilling construction in step 2, need, first according to the erection method of conventional over-water construction platform, set up one for the operation platform of a plurality of percussive drilling drilling constructions.
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, is characterized in that: the width of mounting groove described in step 2 is greater than the sidewall thickness in cofferdam, and the center line of described mounting groove and surrounding outline line coincide.
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, is characterized in that: when the employing river sand described in step 3 carries out backfill to the mounting groove described in step 2, backfill is highly not less than the original bed face of backfill position.
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, is characterized in that: in step 2, a plurality of described percussive drillings are circular bore and its internal diameter is all identical, and a plurality of described percussive drillings are even laying.
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, it is characterized in that: described in multi-disc, the structure of steel sheet pile and size are all identical, described in multi-disc, steel sheet pile is the stake sheet that cross section is U font, and the left and right sides of described steel sheet pile is symmetrically arranged with occlusal crib, adjacent two steel sheet piles are fastenedly connected by occlusal crib and adjacent two steel sheet piles connect to form a shape of cross section and are
the cofferdam component units of shape, the sidewall cross section in described cofferdam is square wave shape.
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, it is characterized in that: described in step 4 after cofferdam fold, adopt water pumper and underwater excavation equipment to draw water and underwater excavation in inside, cofferdam, until be excavated to the elevation of bottom position on underwater support table basis; And draw water and underwater excavation process in, adopt limit from top to bottom to draw water or the mode of inner support, the inner multiple tracks inner support of installing in cofferdam are installed in underwater excavation limit.
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, it is characterized in that: in step 4 after cofferdam fold and adopt water pumper and underwater excavation equipment inside, cofferdam draw water and underwater excavation before, reply needs the inner side, cofferdam at construction underwater support table foundation bottom absolute altitude place to carry out concrete back cover in region under water.
Naked rock foundation construction steel sheet pile cofferdam construction method in above-mentioned a kind of water, it is characterized in that: while carrying out the inserted to play of multi-disc steel sheet pile and closure construction in step 4, should be first along the surrounding outline line in cofferdam, steel sheet pile described in multi-disc is carried out to inserted to play piecewise, and each sheet steel sheet pile is all embedded in described soft basic unit by determined insert depth in step 1; And after the equal inserted to play of steel sheet pile described in multi-disc completes, then steel sheet pile described in multi-disc is carried out to closure construction.
The present invention compared with prior art has the following advantages:
1, construction method step is simple, realization is convenient and construction cost is lower, and the construction period is short, and efficiency of construction is high.
2, each construction sequence is reasonable in design, first according to designing and calculating, determines outline line position, cofferdam measurement and positioning simultaneously, determines that steel sheet pile embeds the degree of depth below scar; Recycling operation platform, according to designing requirement, adopts percussive drilling method along steel sheet-pile cofferdam outline line interlock boring, the final stone cistern forming along cofferdam outline line; Afterwards, adopt river sand backfill stone cistern and exceed original bed face, forming soft basic unit; Then, by root inserted to play steel sheet pile, it is embedded in the soft basic unit in stone cistern, and after the complete steel sheet pile of inserted to play, realize steel sheet-pile cofferdam and close up; Finally, carry out cofferdam underwater concrete back cover, inner support is installed, draw water and carry out cushion cap foundation operation.
3, construction effect is good, the water isolating that steel sheet pile is good combines to the strong effect of contraction in steel sheet pile lower end with mounting groove (inside filling out the soft basic unit of river sand), make the whole reasonable stress in cofferdam, stability strengthens, more economical, simple and direct and efficient compared with other space enclosing structure construction.Meanwhile, the silt that backfill enters in mounting groove has preventing water leakage function, and itself and bottom concrete form a tight water leak preventing structure.
4, practical value is high, it efficiently solves traditional steel sheet-pile cofferdam can only be in the defect of soft stratum application, the method of interlock boring is impacted in employing at naked rock river bed, outline line along steel sheet-pile cofferdam horizontal projection forms stone cistern, then to backfill river sand in stone cistern, form the artificial and embeddable stratum of steel sheet pile, solved the construction difficult problem that steel sheet pile cannot directly embed naked rock river bed in water.
5, by the design and construction of drilling depth and stone cistern width is controlled, both solve steel sheet pile and embedded the problem of taking root, simultaneously because steel sheet pile embeds the operative constraint that section is subject to backfill sand and stone cistern, compare with conventional steel plates pile constructing process, greatly reduced the degree of depth of steel sheet pile embedding foundation ditch below ground.
In sum, the inventive method step is simple, construction cost is lower, efficiency of construction is high and construction effect is good, employing is in the naked rock river bed construction method of inserted to play steel sheet pile again after grooving backfill river sand in advance, the good water isolating of steel sheet-pile cofferdam is filled out to the husky strong effect of contraction to embedding steel sheet pile with stone cistern to combine, having solved steel sheet-pile cofferdam cannot be at the construction difficult problem of naked rock surface " taking root " (directly embedding naked rock river bed), have save time, convenient, efficient, practical, be easy to the advantages such as control.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is construction method FB(flow block) of the present invention.
Fig. 2 is Construction State reference diagram of the present invention.
Fig. 3 is the installation position schematic diagram of the present invention's a plurality of percussive drillings of constructing while carrying out cofferdam bottom mounting groove drilling construction.
Fig. 4 is the structural representation of bottom, cofferdam that the present invention has constructed mounting groove.
Fig. 5 after by mounting groove backfill river sand of the present invention the structural representation of the soft basic unit of formation.
Fig. 6 is the structural representation after cofferdam fold of the present invention.
Fig. 7 is the interlocking pattern schematic diagram between adjacent two steel sheet piles in the present invention cofferdam used.
Description of reference numerals:
1-cofferdam; 2-steel sheet pile; Naked rock in 3-water;
4-percussive drilling; 5-surrounding outline line; 6-occlusal crib;
The soft basic unit of 7-; 8-encloses purlin; 9-mounting groove;
10-inner support.
The specific embodiment
As shown in Figure 1, Figure 2, shown in Fig. 6 and Fig. 7, naked rock foundation construction steel sheet pile cofferdam construction method in water of the present invention, cofferdam 1 used is surrounded by the steel sheet pile 2 of multi-disc successively close proximity, described cofferdam 1 is in naked rock 3 in fastening embedding water and for the steel sheet-pile cofferdam on the underwater support table basis of constructing, and the method comprises the following steps:
Step 1, cofferdam structure size and construction location are determined: according to structure, size and the construction location on need construction underwater support table basis, and working space that need be reserved during in conjunction with the riverbed geology of job location and hydrologic regime and cofferdam construction, structure, size, construction location and the bottom of determining described cofferdam 1 embed the insert depth in naked rock 3 in water, and according to the structure in determined cofferdam 1 and size, determine quantity, size and the model of construction cofferdam 1 single steel plate stake 2 used; Afterwards, according to the construction location in determined cofferdam 1 and adopt conventional over-water construction to measure line-putting method, the surrounding outline line 5 in cofferdam 1 is measured to setting-out.
In the present embodiment, described cofferdam 1 be shaped as rectangle.
In conjunction with Fig. 6, Fig. 7, described in multi-disc, steel sheet pile 2, structure and size all identical, described in multi-disc, steel sheet pile 2 is the stake sheet that cross section is U font, and the left and right sides of described steel sheet pile 2 is symmetrically arranged with occlusal crib 6, adjacent two steel sheet piles 2 are fastenedly connected by occlusal crib 6 and adjacent two steel sheet piles 2 connect to form a shape of cross section and are
the cofferdam component units of shape, the sidewall cross section in described cofferdam 1 is square wave shape.During actual connection, the fastening interlock of occlusal crib 6 of adjacent two steel sheet piles 2, and form a cofferdam component units.
In practice of construction process, before carrying out bottom, cofferdam mounting groove 9 drilling constructions in step 2, need, first according to the erection method of conventional over-water construction platform, set up one for the operation platform of a plurality of percussive drilling 4 drilling constructions.Afterwards, utilize described operation platform, just can complete easy, fast the drilling construction process of a plurality of percussive drillings 4.
In the present embodiment, the width of mounting groove described in step 29 is greater than the sidewall thickness in cofferdam 1,, and the center line of described mounting groove 9 and surrounding outline line 5 coincide.In step 2, a plurality of described percussive drillings 4 are circular bore and its internal diameter is all identical, and a plurality of described percussive drillings 4 are even laying.
In the present embodiment, while adopting river sand to carry out backfill to the mounting groove 9 described in step 2, backfill is highly not less than the original bed face of backfill position.
In the present embodiment, after described cofferdam 1 closes up, adopt water pumper and underwater excavation equipment to draw water and underwater excavation 1 inside in cofferdam, until be excavated to the elevation of bottom position on underwater support table basis; And draw water and underwater excavation process in, adopt limit from top to bottom to draw water or the mode of inner support 10, the 1 inner multiple tracks inner support 10 of installing in cofferdam are installed in underwater excavation limit.Afterwards, then according to the construction method of conventional underwater support table, complete the work progress on described underwater support table basis.
In the present embodiment, described inner support 10, for horizontal support and its quantity are twice, is connected by enclosing purlin 8 between the inwall in described inner support 10 and cofferdam 1.
After described cofferdam 1 closes up and adopt water pumper and underwater excavation equipment 1 inside, cofferdam draw water and underwater excavation before, reply needs 1 inner side, cofferdam at construction underwater support table foundation bottom absolute altitude place to carry out concrete back cover in region under water.
In the present embodiment, while carrying out the inserted to play of multi-disc steel sheet pile 2 and closure construction, first 1 the surrounding outline line 5 along cofferdam, carries out inserted to play piecewise to steel sheet pile described in multi-disc 2, and each sheet steel sheet pile 2 is all embedded in described soft basic unit 7 by determined insert depth in step 1; And after the equal inserted to play of steel sheet pile described in multi-disc 2 completes, then steel sheet pile described in multi-disc 2 is carried out to closure construction.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every any simple modification of above embodiment being done according to the technology of the present invention essence, change and equivalent structure change, and all still belong in the protection domain of technical solution of the present invention.
Claims (7)
1. naked rock foundation construction steel sheet pile cofferdam construction method in a water, cofferdam used (1) is surrounded by the steel sheet pile (2) of multi-disc successively close proximity, described cofferdam (1), in naked rock (3) in fastening embedding water and for the steel sheet-pile cofferdam on the underwater support table basis of constructing, is characterized in that the method comprises the following steps:
Step 1, cofferdam structure size and construction location are determined: according to structure, size and the construction location on need construction underwater support table basis, and working space that need be reserved during in conjunction with the riverbed geology of job location and hydrologic regime and cofferdam construction, structure, size, construction location and the bottom of determining described cofferdam (1) embed the insert depth in naked rock (3) in water, and according to the structure of determined cofferdam (1) and size, determine quantity, size and the model of construction cofferdam (1) single steel plate stake used (2); Afterwards, according to the construction location of determined cofferdam (1) and adopt conventional over-water construction to measure line-putting method, the surrounding outline line (5) of cofferdam (1) is measured to setting-out;
Step 2, cofferdam bottom mounting groove drilling construction: along the surrounding outline line (5) of measuring setting-out in step 1 and going out, adopt impact type rig in water, on naked rock (3), to drill through a plurality of percussive drillings (4) from top to bottom, a plurality of described percussive drillings (4) are in turn connected to form one for the fixing mounting groove (9) in cofferdam (1) bottom, the degree of depth of the mutual interlock of adjacent two described percussive drillings (4) and each percussive drilling (4) is all not less than institute cofferdam, installation position place (1) bottom and embeds the degree of depth in naked rock (3) in water, the width of described mounting groove (9) is not less than the sidewall thickness of cofferdam (1),
The width of mounting groove described in step 2 (9) is greater than the sidewall thickness of cofferdam (1), and the center line of described mounting groove (9) and surrounding outline line (5) coincide;
Step 3, bottom, cofferdam mounting groove backfill construction: adopt river sand to carry out backfill to the mounting groove described in step 2 (9), and the mounting groove of solid river sand (9) forms a soft basic unit (7) that cofferdam (1) bottom is fixed;
Step 4, cofferdam construction: with reference to the surrounding outline line (5) of measuring setting-out in step 2 and going out, and the cofferdam construction method on underwater support table basis carries out inserted to play and the closure construction of multi-disc steel sheet pile (2) routinely, and forms the closed cofferdam (1) after closing up;
While carrying out the inserted to play of multi-disc steel sheet pile (2) and closure construction in step 4, the first surrounding outline line (5) of (1) along cofferdam, steel sheet pile described in multi-disc (2) is carried out to inserted to play piecewise, and each sheet steel sheet pile (2) is all embedded in described soft basic unit (7) by determined insert depth in step 1; And after the equal inserted to play of steel sheet pile described in multi-disc (2) completes, then steel sheet pile described in multi-disc (2) is carried out to closure construction.
2. according to naked rock foundation construction steel sheet pile cofferdam construction method in a kind of water claimed in claim 1, it is characterized in that: before carrying out bottom, cofferdam mounting groove drilling construction in step 2, need, first according to the erection method of conventional over-water construction platform, set up one for the operation platform of a plurality of percussive drillings (4) drilling construction.
3. according to naked rock foundation construction steel sheet pile cofferdam construction method in a kind of water described in claim 1 or 2, it is characterized in that: when the employing river sand described in step 3 carries out backfill to the mounting groove described in step 2 (9), backfill is highly not less than the original bed face of backfill position.
4. according to naked rock foundation construction steel sheet pile cofferdam construction method in a kind of water described in claim 1 or 2, it is characterized in that: in step 2, a plurality of described percussive drillings (4) are circular bore and its internal diameter is all identical, and a plurality of described percussive drillings (4) are even laying.
5. according to naked rock foundation construction steel sheet pile cofferdam construction method in a kind of water described in claim 1 or 2, it is characterized in that: structure and the size of steel sheet pile described in multi-disc (2) are all identical, steel sheet pile described in multi-disc (2) is the stake sheet that cross section is U font, and the left and right sides of described steel sheet pile (2) is symmetrically arranged with occlusal crib (6), adjacent two steel sheet piles (2) are fastenedly connected by occlusal crib (6) and adjacent two steel sheet piles (2) connect to form the cofferdam component units that a shape of cross section is " " shape, the sidewall cross section in described cofferdam (1) is square wave shape.
6. according to naked rock foundation construction steel sheet pile cofferdam construction method in a kind of water described in claim 1 or 2, it is characterized in that: after cofferdam described in step 4 (1) closes up, adopt water pumper and underwater excavation equipment to draw water and underwater excavation (1) inside in cofferdam, until be excavated to the elevation of bottom position on underwater support table basis; And draw water and underwater excavation process in, adopt limit from top to bottom to draw water or the mode of inner support (10), (1) inner multiple tracks inner support (10) of installing in cofferdam are installed in underwater excavation limit.
7. according to naked rock foundation construction steel sheet pile cofferdam construction method in a kind of water claimed in claim 6, it is characterized in that: after cofferdam in step 4 (1) closes up and adopt water pumper and underwater excavation equipment inside, cofferdam (1) draw water and underwater excavation before, reply needs the inner side, cofferdam (1) at construction underwater support table foundation bottom absolute altitude place to carry out concrete back cover in region under water.
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| CN201110315026.1A CN102392458B (en) | 2011-10-17 | 2011-10-17 | Piling beam cofferdam construction method used for bare rock foundation construction in water |
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| CN201110315026.1A CN102392458B (en) | 2011-10-17 | 2011-10-17 | Piling beam cofferdam construction method used for bare rock foundation construction in water |
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| CN103882881B (en) * | 2014-04-11 | 2015-12-30 | 山东黄河工程集团有限公司 | Go deep into rock construction method under water |
| CN104196044B (en) * | 2014-09-05 | 2016-01-20 | 中铁四局集团有限公司 | The spacing pore-forming groove milling of Churn drill is in conjunction with the cofferdam construction method of steel sheet pile |
| CN104727332A (en) * | 2015-03-19 | 2015-06-24 | 中交二航局第三工程有限公司 | Steel sheet pile cofferdam bottom rock-socketed anchoring method |
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| CN108457282A (en) * | 2017-04-24 | 2018-08-28 | 中交公局厦门工程有限公司 | Deep water hard rock is without back cover steel sheet pile cofferdam construction method |
| CN108457283A (en) * | 2017-04-24 | 2018-08-28 | 中交公局厦门工程有限公司 | Deep water hard rock steel sheet-pile cofferdam pilot hole fluting grouting construction method |
| CN110130393A (en) * | 2019-05-22 | 2019-08-16 | 中铁四局集团有限公司 | A kind of underwater foundation pit drilling of soft rock and punching point arrangement method |
| CN114809043A (en) * | 2022-04-26 | 2022-07-29 | 中交第二公路工程局有限公司 | Steel pipe and corrugated steel plate combined hanging box cofferdam and construction method |
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