CN1251873A - Cut-off wall for dyke and dam and its construction method - Google Patents
Cut-off wall for dyke and dam and its construction method Download PDFInfo
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- CN1251873A CN1251873A CN 98110514 CN98110514A CN1251873A CN 1251873 A CN1251873 A CN 1251873A CN 98110514 CN98110514 CN 98110514 CN 98110514 A CN98110514 A CN 98110514A CN 1251873 A CN1251873 A CN 1251873A
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Abstract
The present invention relates to a leakage cutting-off wall for dikes or dams and its construction method. Said cutting-off wall with a thickness of greater than 67mmis constructed through such technological steps as preparing several groups of piles (with a diameter of 100-300 mm) which are made up by mixing cement paste with in-situ clay of dikes or dams, sequentially (each group has at least two piles constructed at the same time); after the first group of piles is finished, constructing the second group; cutting the piles, butt joining of piles in different groups, and so on until all groups of piles are finished to construct a unit. Its advantages are reasonable structure, less consumption of raw materials and high construction efficiency.
Description
The invention provides a kind of cut-off wall and job practices thereof of constructing in dykes and dams.
China is a country that big flood is more frequent, river dyke as one of flood control and disaster reduction principal works measure is being brought into play enormous function in flood control, because dykes and dams often exist sand base, whaleback, frozen soil heap dike hole to occur, roll defectives such as unreal, so in various degree seepage, piping phenomenon can take place, the safety that seriously jeopardizes dykes and dams.Cutting of dykes and dams oozed the important measures that become solution seepage, piping.Cut at present a method of oozing have multiple, comprising in dykes and dams, establishing cut-off wall.Existing cut-off wall becomes the wall scheme to have two kinds: 1, fluid concrete becomes wall, and its main construction course is mechanical equivalent of light excavation grooving, taking-up weak soil, mud off, tremie concrete.2, the high-pressure injection cement paste forms body of wall, its main construction course is, cut the hole of boring certain depth on the dykes and dams that ooze processing with plant equipment at need earlier, with carrying out high-pressure injection (hydrojet is the cement paste of regulation water/binder ratio) at the bottom of the high-pressure water pipe patchhole, between adjacent two holes, form body of wall with the high-pressure injection of certain inclination angle.Work efficiency was on the low side when above-mentioned two kinds of schemes were constructed, and the cut-off wall cost of formed thereby is higher, and latter's cost is especially high.And the body of wall that adopts the high-pressure injection cement paste to form, also there are thickness of wall body inequality, discontinuous defective sometimes.
The object of the present invention is to provide a kind of thickness of wall body evenly continuously, the few cut-off wall for dyke and dam of consumptive material and the method for this cut-off wall of constructing.
For achieving the above object, cut-off wall provided by the present invention fully mixes and stirs the stake that forms by cement paste and dykes and dams original soil and cuts overlap joint mutually and construct and form, and each diameter of constructing cut-off wall is 100-300mm, and the body of wall minimum thickness of adjacent each lap-joint is greater than 67mm.Simultaneously, the job practices of cut-off wall for dyke and dam provided by the present invention is: the stake that constitutes cut-off wall adopts deep layer Beater operator method to divide into groups in order to construct, the stake of each group construction simultaneously is more than two and each space, the stake number that each group is constructed is identical, after first group of pile driving construction is intact, vertically move the construction equipment of stake, implement the construction of second group of stake, and make each of second group cut overlap joint mutually with each of first group respectively, then, the construction sequence that repeats second group of stake is carried out the construction of the 3rd group of stake, each that makes the 3rd group cut overlap joint mutually with each of second group respectively, the construction of each group stake is subsequently postponed successively, connects into wall until whole groups and finishes a construction unit.
The index in the 90 day length of time of cut-off wall designing requirement is:
1, transmission coefficient is not more than A * 10
-6Cm/s (1＜A＜10);
2, the seepage failure ratio falls and is not less than 200;
3, the body of wall unconfined compression strength is not less than 0.3MPa.
The general available formula of the calculating of thickness of wall body: S=Δ H/[j]
In the formula: S-impervious wall minimum thickness
The head difference of Δ H-impervious wall both sides
[j]-design allows than falling, generally get destruction than fall 1/2nd
According to the height and the flood control level of present rivers embankment, in general, the design head difference can be greater than 10.00m, and Δ H gets 10m during calculating; Destroy than falling all greater than 300 through test, safety factor gets 2.0, and then to allow than falling [j] be 150 in design.The cut-off wall minimum thickness that is calculated actual needs by following formula is 67mm.And each diameter of cut-off wall provided by the present invention is 100-300mm, so ooze the wall thickness of requirement as long as the body of wall minimum thickness that guarantees adjacent each lap-joint greater than 67mm, can satisfy to cut.Analyze as can be known from the curing mechanism of cement and original soil, the slurry of eating of the soil body, adopt job practices provided by the present invention, can form comparatively closely knit cement soil continuous wall body.Cut-off wall provided by the invention through infiltration test, enclose well test, unconfined compression strength test, draws following result of the test table:
Table 1: body of wall infiltration test result
| The test specimen numbering | Cement mixed ratio (%) | Water/binder ratio | Sampling point | Transmission coefficient (cm/s) | Destroy than falling |
| ????1 | ????12 | ????1.5 | Degree of depth 0-1m | 2.82×10 -6 | ???＞300 |
| ????2 | ????12 | ????2.0 | Degree of depth 0-1m | 8.56×10 -7 | ???＞300 |
| ????3 | ????8 | ????1.5 | Degree of depth 0-1m | 2.26×10 -6 | ???＞300 |
| ????4 | ????8 | ????2.0 | Degree of depth 0-1m | 4.41×10 -6 | ???＞300 |
| ????5 | ????12 | ????1.5 | Degree of depth 1-2m | 1.34×10 -6 | ???＞300 |
| ????6 | ????12 | ????2.0 | Degree of depth 1-2m | 5.39×10 -9 | ???＞300 |
| ????7 | ????8 | ????1.5 | Degree of depth 1-2m | 1.15×10 -7 | ???＞300 |
| ????8 | ????8 | ????2.0 | Degree of depth 1-2m | 1.92×10 -7 | ???＞300 |
Annotate: 1, specimen test length of time is in 14 days
2, seepage direction is a water (flow) direction, promptly perpendicular to the direction of cut-off wall
Table 2: body of wall encloses the well result of the test
| Specimen coding | The degree of depth (m) | Transmission coefficient (cm/s) | Compressive strength (MPa) | The seepage failure ratio falls | Resistance to compression bullet mould (MPa) |
| ????1 | ??1.5 | ????1.17×10 -6 | ????17.48 | ????＞333 | ????3.43×10 3 |
| ????2 | ??3.0 | ????3.5×10 -8 | ????2.01 | ????＞333 | Test specimen is impaired |
| ????3 | ??1.0 | ????4.24×10 -7 | ????6.1 | ????＞333 | ????8.08×10 3 |
| ????4 | ??2.7 | ????6.7×10 -8 | Test specimen is impaired | ????＞333 | ????2.45×10 4 |
| ????5 | ??2.0 | ????3.49×10 -7 | ????9.94 | ????＞333 | ????1.21×10 4 |
Annotate: 1, testing the length of time is 60 days
2, to enclose well be on embankment in test, encloses well depth 6m, and the dry season construction is enclosed well fully more than groundwater table.
Table 3: body of wall unconfined compression strength test result
| The test specimen numbering | Cement mixed ratio (%) | Water/binder ratio | Sampling point | Compressive strength (MPa) |
| ????1 | ????12 | ????1.5 | Degree of depth 0-1m | ????0.32 |
| ????2 | ????12 | ????2.0 | Degree of depth 0-1m | ????0.40 |
| ????3 | ????8 | ????1.5 | Degree of depth 0-1m | ????0.50 |
| ????4 | ????8 | ????2.0 | Degree of depth 0-1m | ????0.74 |
| ????5 | ????12 | ????1.5 | Degree of depth 1-2m | ????1.98 |
| ????6 | ????12 | ????2.0 | Degree of depth 1-2m | ????1.45 |
| ????7 | ????8 | ????1.5 | Degree of depth 1-2m | ????2.92 |
| ????8 | ????8 | ????2.0 | Degree of depth 1-2m | ????2.31 |
Annotate: 1, cut-off wall length of time that is shaped is 11 days
2, the preceding full water of cut-off wall compression test is 48 hours
From tabulation 1-table 3 as seen, every index of this cut-off wall all satisfies engineering design and requires (although going up the less than 90 days in the length of time of the listed body of wall of table).
The advantage that cut-off wall for dyke and dam provided by the invention has is rational in infrastructure, the material consumption is little, and anti-seepage effect is better.Cut-off wall job practices work efficiency height provided by the invention.
Description of drawings:
Accompanying drawing is the structure chart of cut-off wall for dyke and dam embodiment cross section provided by the invention.
Embodiment below in conjunction with accompanying drawing and this cut-off wall for dyke and dam that is shaped further specifies the present invention.
As shown in the figure, this cut-off wall by cement paste and dykes and dams original soil fully mix and stir form the stake cut mutually the overlap joint constitute.Each of this cut-off wall employing deep layer Beater operator method construction, deep layer Beater operator method is a kind of foundation consolidating technology that is widely used in the Industrial and Civil Engineering.In the construction, can select the every group of 3-8 pile of constructing simultaneously.Present embodiment is selected every group of three piles of constructing simultaneously.Construction equipment adopts the DZJ-25 type multi-drill small-diameter deep-layer mixing pile machine that three drilling rods are arranged, and this machine has been applied for Chinese patent (application number is 98235301.4), and the diameter of drill bit is selected 220mm on the drilling rod, to guarantee cut-off wall preferable performance price ratio is arranged.Spacing distance between every group three pile is guaranteed by the mutual distance of three drilling rods of stake machine, sequence of construction as shown in the figure, the first group of stake 1 of at first constructing, its work progress is: the drill bit at three drilling rod front ends advances in the process of desired depth to soil layer, cement paste is sprayed in the soil body by drill bit through drilling rod, drill bit is drilled into downwards and promotes back behind the desired depth externally gradually, finishes the construction of first group of stake.In the process that drill bit creeps into and promotes, promptly cement paste and original soil have been carried out fully mixing and stirring.Before carrying out second group of pile driving construction, vertically move drilling rod (can by mobile mixing pile machine realize), its displacement should guarantee that second group of stake 2 cut overlap joint mutually with first group 1, and the thickness that needs assurance adjacent studs lap-joint body of wall is greater than 67mm.By calculating, adopting diameter is the drill bit of 220mm, and lap length can guarantee that greater than 12mm lap-joint's thickness of wall body is greater than 67mm between adjacent studs.Drilling rod move appropriate after, repeat the work progress of first group of stake, promptly finish the construction of second group of stake 2.The rest may be inferred to connect down the construction of the 3rd group of stake 3, can finish the construction unit that one 9 pile links to each other.Still construct until finishing the required some constructions unit of cut-off wall by said process in next construction unit.For guaranteeing the continuity of cut-off wall, each lap length of constructing between the unit should be 100-150mm.
Technical scheme provided by the invention and existing two kinds of cut-off walls become that the contrast of some data and index sees Table 4 between the wall scheme (fluid concrete becomes wall, high-pressure injection cement paste to become wall).
By table 4 as seen, cut-off wall for dyke and dam provided by the invention and job practices thereof, becoming wall effect, construction efficiency and becoming on every index such as wall cost, all be better than the technical scheme (fluid concrete becomes wall, high-pressure injection cement paste to become wall) of existing shaping cut-off wall.
Table 4: scheme comparing result
| Project | Technical solution of the present invention | The high-pressure injection cement paste becomes the wall technology scheme | Fluid concrete becomes the wall technology scheme |
| Become wall thickness degree (millimeter) | ????100-300 | ????50-600 | ????300-600 |
| Become the wall effect | Thickness of wall body is evenly continuous | Thickness of wall body is inhomogeneous, and is discontinuous sometimes | Thickness of wall body is even but joint is many |
| Construction efficiency (square metre/platform. the time) | ????13-20 | ????2.5 | ????6-10 |
| One-tenth wall cost (unit/square metre) | ????60-80 | ????300-400 | ????180-230 |
Claims (3)
1, a kind of cut-off wall for dyke and dam is characterized in that: by cement paste and dykes and dams original soil fully mix and stir form the stake cut mutually the overlap joint be built into, each diameter of constructing cut-off wall is 100-300mm, the body of wall minimum thickness of adjacent each lap-joint is greater than 67mm.
2, a kind of job practices of cut-off wall for dyke and dam, it is characterized in that: the stake that constitutes cut-off wall adopts deep layer Beater operator method to divide into groups in order to construct, the stake of each group construction simultaneously is more than two and each space, the stake number that each group is constructed is identical, after first group of pile driving construction is intact, vertically move the construction equipment of stake, implement the construction of second group of stake, and make each of second group cut overlap joint mutually with each of first group respectively, then, the construction sequence that repeats second group of stake is carried out the construction of the 3rd group of stake, and each that makes the 3rd group cut overlap joint mutually with each of second group respectively, the construction of each group stake is subsequently postponed successively, connects into wall until whole groups and finishes a construction unit.
3, according to the job practices of the described cut-off wall for dyke and dam of claim 2, it is characterized in that: every group of stake number of constructing simultaneously is the 3-8 root.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98110514 CN1251873A (en) | 1998-10-16 | 1998-10-16 | Cut-off wall for dyke and dam and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98110514 CN1251873A (en) | 1998-10-16 | 1998-10-16 | Cut-off wall for dyke and dam and its construction method |
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|---|---|
| CN1251873A true CN1251873A (en) | 2000-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98110514 Pending CN1251873A (en) | 1998-10-16 | 1998-10-16 | Cut-off wall for dyke and dam and its construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452661A (en) * | 2014-11-13 | 2015-03-25 | 浙江省电力设计院 | Composite wave-resisting seepage-proof wall for coast flexible direct-current convertor station and transformer substation and construction method |
| CN104988938A (en) * | 2015-05-20 | 2015-10-21 | 上海市建工设计研究院有限公司 | South China sea coastal area coral reef debris layer waterproof curtain body construction processing method |
| CN113756285A (en) * | 2021-09-17 | 2021-12-07 | 山东源基建设工程有限公司 | Cement-soil impervious wall and construction method thereof |
-
1998
- 1998-10-16 CN CN 98110514 patent/CN1251873A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452661A (en) * | 2014-11-13 | 2015-03-25 | 浙江省电力设计院 | Composite wave-resisting seepage-proof wall for coast flexible direct-current convertor station and transformer substation and construction method |
| CN104988938A (en) * | 2015-05-20 | 2015-10-21 | 上海市建工设计研究院有限公司 | South China sea coastal area coral reef debris layer waterproof curtain body construction processing method |
| CN113756285A (en) * | 2021-09-17 | 2021-12-07 | 山东源基建设工程有限公司 | Cement-soil impervious wall and construction method thereof |
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