CN1065503A - The combination of explosion with strong tamping for compacting method of saturated loose sand - Google Patents
The combination of explosion with strong tamping for compacting method of saturated loose sand Download PDFInfo
- Publication number
- CN1065503A CN1065503A CN 92100099 CN92100099A CN1065503A CN 1065503 A CN1065503 A CN 1065503A CN 92100099 CN92100099 CN 92100099 CN 92100099 A CN92100099 A CN 92100099A CN 1065503 A CN1065503 A CN 1065503A
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- Prior art keywords
- sand
- cartridge bag
- closely knit
- pass
- meters
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of method of closely knit saturated loose sand, blast and strong tamping technology are effectively combined, utilize the small-charge blasting vibration closely knit to sand hypobasal earlier with the densification effect, utilize strong rammer compacting effect to the compacting of sand epibasal tier then, and utilize the two combined power encryption effect, make saturated loose sand foundation in full depth bounds, reach in close state, played and improved bearing capacity of foundation soil and the effect that reduces settlement of foundation, encrypt quality and be better than vibroflotation method, and reduce cost 50%.
Description
The invention belongs to the civil engineering groundwork processing method, mainly be used for waterborne or saturated loose sand under water closely knit.
What mainly adopt in the engineering of handling the saturated loose sand ground at present is vibroflotation method.This method be by vibrating impacter generation level to vibration force, shake and squeeze sand body and reach the raising bearing capacity of foundation soil, reduce settling amount.The problem that this method exists is closely knit second-rate to the layer of sand bottom, difficulty of construction is big, needs vibrating impacter, stepped type boom hoisting, pumps water system during simultaneously owing to this method of enforcement, equipment such as motor that power is 50～75 kilowatts and control system are so construction cost is higher.
The object of the present invention is to provide a kind ofly to make saturated loose sand foundation in full depth bounds, bring up to medium dense state, reach and improve bearing capacity of foundation soil and the job practices that reduces settlement of foundation.
At the problem that prior art exists, the present invention adopts in the sand base boring to imbed the little dose blasting charge, and hole-by-hole initiation by row, utilizes explosion vibration closely knit to sand hypobasal, utilizes then to ram the compacting effect to the compacting of sand epibasal tier by force.
Fig. 1 is combination of explosion with strong tamping encryption principle figure.
Fig. 2 is 5 meters＜H of sand base thickness
0Single cartridge bag cloth medicine figure of＜8 meters.
Fig. 3 is 8 meters≤H of sand base thickness
0＜15 meters double-deck cartridge bag cloth medicine figure.
Now by reference to the accompanying drawings principle of the present invention is introduced in detail, check sand base is closely knit fair with standard blow number N method, the undressed natural or common N=3 of artificial sand base～10 are hit, the examination requirements of close sand base (N＞15 are hit) in can not satisfying, to the sand base of thickness greater than 5 meters, with heavy-tamping method closely knit its effectively (N＞15 are hit) compacting depth in 5 meters. Assay is shown in curve among Fig. 1 (2). Below 6 meters, assay is shown in Fig. 1 curve (1) with closely knit its effective (N＞15 are hit) compacting depth of explosion method.
The present invention adopts and holes in the closely knit sand base of need earlier, in the hole, place the little dose blasting charge, utilize explosion vibration and compaction effect to make the sand base of the degree of depth below 6 meters obtain effectively closely knit (N＞15 are hit), adopt then strong rammer to make 5 meters of the degree of depth obtain effectively closely knit (N＞15 are hit) with interior sand base; The layer of sand that the degree of depth is 4 meters～7 meters is because the double action of blast and strong rammer also obtains effectively closely knit (N＞15 are hit). So just make the sand base in the full degree of depth is I, II, III district among Fig. 1, reach in close (N＞15 are hit) requirement.
The present invention can adopt two kinds of cloth prescription formulas of embedding single cartridge bag or two cartridge bags in force, when the thickness of sand base is 5 meters＜H
0In the time of＜8 meters, can select single cartridge bag cloth prescription formula for use.Its cloth medicine figure as shown in Figure 2.Hole (4) with cartridge bag V at the sand base earlier
1Imbed cartridge bag V
1Buried depth H
1With sand groundwork thickness H
0The pass be H
1=(0.5～0.7) H
0(rice).Single cartridge bag V
1Dose Q
1With its buried depth H
1The pass be Q
1=(0.03～0.08) H
3 1(kilogram).Distance between the adjacent powder charge hole (4)
Thick at layer of sand is 8 meters≤H
0In the time of＜15 meters, adopt double-deck cartridge bag cloth prescription formula as shown in Figure 3, upper strata cartridge bag V
2To the distance H between the sand primary surface (5)
1With the cartridge bag V of lower floor
3Distance H to required encryption sand base substrate (3)
2Substantially equal, with sand base thickness H
0Between the pass be H
1≈ H
2≈ (0.35～0.45) H
0, and (H
1+ H
2)＞0.75H
0, upper and lower layer cartridge bag V
2, V
3Between distance H
3Should satisfy following relational expression H
3＜(H
1+ H
2)/3.Upper strata cartridge bag V
2Dose Q
2With its buried depth H
1The pass be: Q
2=(0.03～0.08) H
3 1(kilogram), the cartridge bag V of lower floor
3Dose Q
3With its distance H to sand base substrate (3)
2The pass be: Q
3=(0.08～0.16) H
3 2(kilogram), the distance between the adjacent powder charge hole (4)
No matter adopt individual layer cartridge bag cloth medicine or double-deck cartridge bag cloth prescription formula, all adopt hole-by-hole initiation by row, adjacent two hole burst periods were separated by more than 20 minutes.After the end of constructing is encrypted in blast, adopt strong the rammer to carry out the encryption of secondary dynamic load, ram by force to encrypt and carry out in two steps.Carry out a rammer earlier, adopt full the rammer that the sand base is encrypted then.When point rams, single-point is rammed energy (300～400) T-m, grid spacing (3～5) rice, divide twice rammer, be no less than (2～4) sky twice blanking time, and the single-click number is no less than (10～15) and hits, point rams and finishes to carry out full rammer behind (3～5) sky, full ram energy (150～250) T-m, completely ram the single-click number and be no less than (2～3) and hit, adjacent two hammer into shape suitably overlapping.Sign (6) is a waterline among Fig. 2, Fig. 3.
After adopting the present invention that the saturated sand base is encrypted, with the check of standard blow number method, the sand base is in full depth bounds, and the average N value is hit greater than 25, the designing requirement of close sand base in satisfying fully.Simultaneously, adopt the present invention to compare and to reduce cost 50% with existing vibrocompaction.
One embodiment of the present of invention are as follows, and institute's works area sand base thickness is 12～15m, adopts layer cloth prescription formula shown in Figure 3, powder charge pitch of holes a
2 Be 5m, 2 of single hole cartridge bags, upper strata cartridge bag V
2Distance H to layer of sand surface (5)
1Be 4.5 meters, upper strata cartridge bag V
2With the cartridge bag V of lower floor
3Between distance H
3=3～3.5m, the cartridge bag V of lower floor
3Dose Q
3=10Kg, upper strata cartridge bag V
2Dose Q
2=8Kg adopts hole-by-hole initiation by row.Adopt strong the rammer to encrypt after the explosive treatment, the heavy 19.6T of hammer, hammer footpath Φ 2.2m, point rams and hangs high 18.6m.Single-point tamping point energy 365T-m, point rams spacing 4 * 4m, divides twice rammer, twice three days at interval.The first pass single-point is rammed 15 times, and second time single-point is rammed 12 times.The full rammer hung high 10.2m, and single-point is rammed energy 200T-m, the overlapping 1/4 hammer footpath of adjacent two hammers, several 3 times of single-click.
Claims (6)
1, a kind of method of closely knit saturated loose sand has adopted blast and strong tamping technology, it is characterized in that earlier little cartridge bag is imbedded in boring in the sand base, and hole-by-hole initiation by row, utilizes small-charge blasting closely knit to sand hypobasal; Explode closely knit after again with strong compacting to the compacting of sand epibasal tier, utilize the two combined power densification make full sand base reach in close requirement.
2, the method for closely knit saturated loose sand according to claim 1 is characterized in that the thick H of sand basic unit that encrypts when needing
0Be 5 meters＜H
0In the time of＜8 meters, embedding single cartridge bag V in the sand base
1; Cartridge bag V
1Buried depth H
1With sand layer thickness H
0The pass be:
H
1=(0.5～0.7) H
0(rice);
Single cartridge bag V
1Dose Q
1With its buried depth H
1The pass be:
Q
1=(0.03～0.08) H
3 1(kilogram)
Between the adjacent powder charge hole (4) apart from a
1With single cartridge bag dose Q
1The pass be:
3, the method for closely knit saturated loose sand according to claim 1 is characterized in that as the thick H of layer of sand
0Be 8 meters≤H
0In the time of＜15 meters, adopt double-deck cartridge bag; Upper strata cartridge bag V
2Distance H to sand primary surface (5)
1With the cartridge bag V of lower floor
3Distance H to sand substrate (3)
2With sand layer thickness H
0Between the pass be: H
1≈ H
2=(0.35～0.45) H
0, and (H
1+ H
2)＞0.75H
0, upper strata cartridge bag V
2With the cartridge bag V of lower floor
3Between distance H
3Should satisfy following relational expression: H
3＜(H
1+ H
2)/3, upper strata cartridge bag V
2Dose Q
2With its buried depth H
1The pass be:
Q
2=(0.03～0.08) H
3 1(kilogram)
The cartridge bag V of lower floor
3Dose Q
3And it is to the distance H between the sand base substrate (3)
2The pass be:
Q
3=(0.08～0.16) H
3 2(kilogram)
Between the adjacent powder charge hole (4) apart from a
2For:
4, the method for closely knit saturated loose sand according to claim 1 is characterized in that carrying out earlier a rammer, adopts full the rammer that the sand base is encrypted then.
5, according to the method for claim 1 and 4 described closely knit saturated loose sands, to ram energy be (300～400) T-m to single-point when it is characterized in that ramming, and grid spacing (3～5) meter divides twice rammer, be no less than (2～4) sky at interval twice, the single-click number is no less than (10～15) and hits.
6, according to the method for claim 1 and 4 described closely knit saturated loose sands, it is characterized in that completely ramming energy is (150～250) T-m, and the single-click number is no less than (2～3) and hits, and adjacent two hammers are suitably overlapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100099 CN1025923C (en) | 1992-01-17 | 1992-01-17 | Combination of explosion with strong tamping for compacting saturated open sand stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100099 CN1025923C (en) | 1992-01-17 | 1992-01-17 | Combination of explosion with strong tamping for compacting saturated open sand stratum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065503A true CN1065503A (en) | 1992-10-21 |
| CN1025923C CN1025923C (en) | 1994-09-14 |
Family
ID=4938367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92100099 Expired - Fee Related CN1025923C (en) | 1992-01-17 | 1992-01-17 | Combination of explosion with strong tamping for compacting saturated open sand stratum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1025923C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350103C (en) * | 2003-01-23 | 2007-11-21 | 上海国际港务（集团）股份有限公司 | Filling free vibroflotation method |
| CN100374655C (en) * | 2005-11-17 | 2008-03-12 | 中国矿业大学 | Synchronous blast-enlarging treatment method for liquified soil foundation of highway |
| CN100532729C (en) * | 2007-06-28 | 2009-08-26 | 刘汉龙 | High vacuum well-points dewatering groundwork treatment method by shallow ramming compaction and deep blasting compaction |
| CN108360499A (en) * | 2018-02-11 | 2018-08-03 | 北京中科力***技术工程有限公司 | A kind of closely knit processing method of runway basis large area explosion |
| CN111910614A (en) * | 2020-08-14 | 2020-11-10 | 大连万鹏基础工程有限公司 | Blasting compaction combined dynamic compaction foundation treatment method |
-
1992
- 1992-01-17 CN CN 92100099 patent/CN1025923C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350103C (en) * | 2003-01-23 | 2007-11-21 | 上海国际港务（集团）股份有限公司 | Filling free vibroflotation method |
| CN100374655C (en) * | 2005-11-17 | 2008-03-12 | 中国矿业大学 | Synchronous blast-enlarging treatment method for liquified soil foundation of highway |
| CN100532729C (en) * | 2007-06-28 | 2009-08-26 | 刘汉龙 | High vacuum well-points dewatering groundwork treatment method by shallow ramming compaction and deep blasting compaction |
| CN108360499A (en) * | 2018-02-11 | 2018-08-03 | 北京中科力***技术工程有限公司 | A kind of closely knit processing method of runway basis large area explosion |
| CN111910614A (en) * | 2020-08-14 | 2020-11-10 | 大连万鹏基础工程有限公司 | Blasting compaction combined dynamic compaction foundation treatment method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1025923C (en) | 1994-09-14 |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |