CN101538851A - Construction technology for reinforcing soft soil foundation by transverse pressurization and dedicated aeration zone press-in device - Google Patents
Construction technology for reinforcing soft soil foundation by transverse pressurization and dedicated aeration zone press-in device Download PDFInfo
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- CN101538851A CN101538851A CN 200910049213 CN200910049213A CN101538851A CN 101538851 A CN101538851 A CN 101538851A CN 200910049213 CN200910049213 CN 200910049213 CN 200910049213 A CN200910049213 A CN 200910049213A CN 101538851 A CN101538851 A CN 101538851A
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Abstract
The invention provides a construction technology for soft soil foundation, comprising the following steps: 1. pressing a plurality of expandable components into foundation soil body to preset depth; 2. facilitating the expandable components to expand and extruding the foundation soil body; 3. taking the expandable components out of the foundation soil body so as to form a cavity on the foundation soil body; 4. filling fillers in the cavity to form a drainage channel. The invention also provides an aeration zone press-in device dedicated to the construction technology of the invention, comprising an insert piece and a press piece; wherein, the insert piece is provided with a guide head with a guide rod while the press piece is a hollow rod piece; the connecting part of the guide head and the guide rod forms a pressure surface used to bear pressing from the press piece; the pressure surface is also provided with a plurality of belt hooks used to hook the aeration zone. The aeration zone press-in device of the invention can be inserted into the foundation soil body in a basically vertical manner and the construction technology of the invention greatly reduces time duration of prepressing in the prior art and improves the treatment effect of the soft soil foundation.
Description
Technical field
The present invention relates to the foundation construction technical field, relate in particular to a kind of construction technology of the reinforcing soft ground that pressurizes, and a kind of zone of aeration that is exclusively used in this construction technology is pressed into device.
Technical background
Extensively exist the weak argillic horizon that marine facies, lacustrine facies and river facies deposit in China, the characteristics of this soil are that water content is big, compressibilty is high, intensity is low, bad hydraulic permeability, can produce sizable sedimentation under the building load effect.For this kind ground, when constructing, need reinforce ground.
At present soft foundation is reinforced discharging consolidation method commonly used, it mainly is to utilize the soil body to conduct oneself with dignity, produce in preloading on the ground, in foundation soil load actions such as negative pressure of vacuum, and vertical drainage device by in ground, burying underground, make the pore water in the foundation soil drain into dewatering installation by horizontal radial, by dewatering installation water is drained into the face of land again, meanwhile ground is progressively realized fixed.
The subject matter of existing method is, the soil stress that is produced by the vertical pressurization in the face of land is less to fixed effect to the level of soil, causes the radially discharging consolidation time of level longer, needs the long time just can reach engine request, influence the duration, also influence construction costs.
These negative effects to soft foundation more so.Especially to having the bad soil bodys such as macrovoid ratio, high-moisture, hypotonicity, low intensive saturated soft soil, relevant both at home and abroad generally all being defined in when adopting consolidation in teach book and the job specfication will be taked certain special measures, and will reach the loading consolidation time of length.This also is based on vertical pressurization at existing consolidation and produces soil stress and fixed proposition.This technology is difficult to reinforce at short notice saturated soft soil.
Under the construction technology of existing consolidation, if consolidated subsoil at short notice, must strengthen ground load, and the horizontal radial infiltration consolidation rate of the increase of ground load in can't the radical change ground, the stress that can make foundation soil produce under the heavy load effect is seriously damaged the prototype structure of saturated soft soil on the contrary, causes its permeability obviously to reduce and makes pore water pressure be difficult to dissipate and remain high, and causes the failure of ground stabilization, when serious, cause foundation instability.
Therefore, proposed a kind of new method in the prior art again, promptly imbedded the hyperbar expansion tube and produce lateral expansion in weak soil, extrusion soil in a horizontal manner in weak soil makes initiatively draining of the soil body.But this method requires the precompressed duration to surpass 12 hours so that the interstitial hydraulic pressure in the soil body rises, soil body lateral compression, and follow interstitial hydraulic pressure to dissipate, impel the face of land fully to fall sedimentation after rise, and then can carry out the pressurization of next round the soil body.Thus, use this method can make that construction period is longer.In addition, owing to only adopt natural drainage, so the bearing capacity of the soil body does not significantly improve.
Therefore, those skilled in the art is devoted to develop the reinforcing soft foundation construction technology that a kind of precompressed duration is short, discharging consolidation is effective for a long time always.
Summary of the invention
Because the above-mentioned defective of prior art, the present invention
Technical problem to be solved provides the horizontal pressurization construction technology for reinforcing soft soil foundation that a kind of pre-duration is short, discharging consolidation is effective.
For achieving the above object, horizontal pressurization construction technology for reinforcing soft soil foundation of the present invention comprises at least: step 1 is pressed into described foundation soil body to desired depth with a plurality of expansible elements; Step 2 makes described expansible elements expansion and pushes described foundation soil body; Step 3 is taken out described expansible elements from described foundation soil body, to form cavity in described foundation soil body; Step 4 is filled filler to form drainage channel in described cavity.
Preferably, a plurality of described expansible elements become array distribution in the described step 1.
Preferably, be positioned at the described expansible elements mutual dislocation distribution of adjacent lines, row in the described array.
Preferably, in the described step 2, the described expansible elements that is positioned at ranks is at interval expanded, remaining described expansible elements is expanded.
Preferably, also comprise step 5, described filler is vibrated so that it is closely knit relatively.
Preferably, before execution in step one to four, at first lay bed course on the surface of described foundation soil body, described bed course is the thick sandy gravel stratum of 30～80cm.
Preferably, described expansible elements is the cylindrical band of gas of 10～15cm diameter.
Construction technology of the present invention has formed unimpeded drainage channel owing to form cavity in foundation soil body after, to described cavity backfill sand material, form sand drain in foundation soil body, shortened the duration of prepressing procedures in the prior art greatly.The backfill sand material that increases forms sand drain, has played the effect of composite foundation, has obvious improvement.
How construction technology of the present invention fast, is substantially vertically inserted expansible elements foundation soil body and to be formed cavity in concrete enforcement, becomes key of the invention process.
For solving the problems of the technologies described above, the present invention also provides a kind of zone of aeration that is exclusively used in construction technology of the present invention to be pressed into device, comprises inlet part and pressing piece; Described inlet part comprises that one is provided with the guide head of guide rod, and described pressing piece is a hollow rod member; The connecting portion of described guide head and described guide rod forms a pressure-bearing surface and is used to accept exerting pressure from described pressing piece; Also be provided with a plurality of buckles that are used for the described zone of aeration of hook on the described pressure-bearing surface: described buckle is semi-circular and has an one way valve.
Zone of aeration of the present invention is pressed into device owing to adopted the said structure design, by hollow pressing piece inlet part is exerted pressure, inlet part is brought zone of aeration into the soil body by buckle simultaneously, realized in the construction technology of the present invention, made press-in device insert foundation soil body with vertical substantially state.
Below with reference to accompanying drawing to the present invention
The technique effect of design, concrete structure and generation be described further, to understand the present invention fully
Purpose, feature and effect.
Description of drawings
Fig. 1 is the structural representation that zone of aeration of the present invention is pressed into device;
Fig. 2 is the partial structurtes schematic diagram that zone of aeration of the present invention is pressed into buckle in the device;
Fig. 3 is the structural representation of buckle closed condition among Fig. 2;
Fig. 4 is the structural representation that zone of aeration of the present invention is pressed into buckle and zone of aeration in the device;
Fig. 5 is the array status schematic diagram of zone of aeration among construction technology one embodiment of the present invention;
Fig. 6 is the array status schematic diagram of zone of aeration among another embodiment of construction technology of the present invention.
The specific embodiment
Zone of aeration of the present invention is pressed into device and mainly comprises an inlet part and a pressing piece.
As shown in Figure 1, inlet part 1 mainly comprises two parts of one, and a part is a conical guide head 11, and another part is the guide rod 12 that is positioned at guide head 11 afterbodys.On external form, the orthography of guide rod 12 drops in the orthography scope of guide head 11 fully, does not have friction substantially with assurance guide rod 12 and the hole wall that guide head 11 presses down the ground datum hole of formation.
As Fig. 2, shown in Figure 3, also be provided with a plurality of buckles 14 that are used for hook zone of aeration 3 on the pressure-bearing surface 13; Buckle 14 is semi-circular and has an one way valve 15.One way valve 15 is realized unidirectional unlatching by limit hinge.
As shown in Figure 4, when pressing piece 2 was exerted pressure inlet part 1, zone of aeration 3 fixedly connected on the buckle 14 will together enter under the foundation soil body with vertical substantially direction along with inlet part 1.
When press-in device, is carried on the pressing piece 2 when carrying in the process last, at this moment, inlet part 1 is retained under the foundation soil body with former attitude with zone of aeration 3.
By the repeated multiple times operation, the mode of a plurality of zone of aeration with array substantially vertically can be plugged in the foundation soil body.Because the foundation soil body situation is similar substantially, the force-bearing situation of press-in device is also similar substantially, and therefore a plurality of zone of aeration can be retained under the foundation soil body with essentially identical angle and attitude.The spacing of a plurality of zone of aeration is basic identical, forms an array.
Below describe horizontal pressurization construction technology for reinforcing soft soil foundation of the present invention in detail.
First embodiment
(1) pending soft foundation is carried out smooth, lay bed course on the face of land, this bed course is the thick sandy gravel stratum of 50cm.
(2), adopt the band of gas of a plurality of diameter 10～15cm according to soil condition and ground stabilization requirement.The one end sealing of this band of gas, an end opening.Utilize zone of aeration of the present invention to be pressed into device, an end of band of gas sealing is imbedded the soil body to projected depth.These band of gas are arranged in matrix in the soil body.
(3) by this opening these band of gas are carried out pneumatic compression, make them fully be expanded to the cylindrical size of the band of gas, thereby the soil body is pushed.Thus, can in weak soil, form columniform hole.Compression rate can be according to the character decision of the soil body.
(4) band of gas is exitted, pull up the band of gas after the band of gas is restored to the original state, insert coarse sand in the hole that in weak soil, forms, thereby in weak soil, form sand drain.This sand drain is as the drainage channel in the weak soil.The water body of discharging from sand drain is discharged the place by the gravel bed course.Along with the continuous discharge of water body in the soil body, the soil body obtains fixed gradually, reaches the reinforcement of soft soil purpose.
According to above-mentioned horizontal pressurization construction technology for reinforcing soft soil foundation, because after the soil body is pushed, in by the hole that forms of extruding, insert coarse sand as filler in this soil body, to form drainage channel, so that the water body in this soil body is got rid of the soil body fast, shorten construction period, reduced construction costs.In addition, this sand drain has also formed the composite foundation with certain replacement ratio when becoming drainage channel.
Describe below according to a second embodiment of the present invention.
Second embodiment and first embodiment are basic identical, and its difference is the arrangement mode of the band of gas.As shown in Figure 5, the band of gas 1 that is pressed into the soil body is quincunx, the band of gas interlaced arrangement in promptly adjacent two row (or two row).Adopt this kind mode to arrange the band of gas, can make that earth stress is even.
The third embodiment of the present invention is described below.
The 3rd embodiment and second embodiment are basic identical, and its difference is the inflation pressuring method of the band of gas.As shown in Figure 6, earlier the band of gas 1 of the 1st, the 3rd, the 5th, the 7th, the 9th and the 11st row is inflated.Similar with first embodiment, to these band of gas of having inflated exitted pull out after, insert coarse sand in the hole that in this soil body, forms to form sand drain.
Then, the band of gas to the 2nd, the 4th, the 6th, the 8th, the 10th and the 12nd row carries out pneumatic compression to form the hole in the soil body.Subsequently, in these holes, insert coarse sand and form sand drain.
In the present embodiment, at first the part in the band of gas is inflated, exitted, rises and pull out and pour into coarse sand in formed hole.Irritating in the hole of the part in the soil body has under the situation of coarse sand, and remaining a part of band of gas is inflated, exits, risen and pull out and pour into coarse sand in formed hole.Thus, earth stress is even, and the sand drain form can be not destroyed, can keep the unimpeded of drainage channel.
In sum, just the present invention described in this manual
Several preferred embodiment.All technician in the art are according to the present invention
Design on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in the present invention
The claim protection domain in.
Claims (8)
1, a kind of horizontal pressurization construction technology for reinforcing soft soil foundation comprises at least:
Step 1 is pressed into described foundation soil body to desired depth with a plurality of expansible elements;
Step 2 makes described expansible elements expansion and pushes described foundation soil body;
Step 3 is taken out described expansible elements from described foundation soil body, to form cavity in described foundation soil body;
Step 4 is filled filler to form drainage channel in described cavity.
2, construction technology as claimed in claim 1 is characterized in that, a plurality of described expansible elements become array distribution in the described step 1.
3, construction technology as claimed in claim 2 is characterized in that, the described expansible elements mutual dislocation that is positioned at adjacent lines, row in the described array distributes.
4, construction technology as claimed in claim 2 is characterized in that, in the described step 2, the described expansible elements that is positioned at ranks is at interval expanded, and remaining described expansible elements is expanded.
5, construction technology as claimed in claim 1 is characterized in that, also comprises step 5, and described filler is vibrated so that it is closely knit relatively.
6, construction technology as claimed in claim 1 is characterized in that, before execution in step one to four, at first lays bed course on the surface of described foundation soil body, and described bed course is the thick sandy gravel stratum of 30～80cm.
As the arbitrary described construction technology of claim 1 to 6, it is characterized in that 7, described expansible elements is the cylindrical band of gas of 10～15cm diameter.
8, a kind of special-purpose zone of aeration is pressed into device, it is characterized in that, comprises inlet part and pressing piece; Described inlet part comprises that one is provided with the guide head of guide rod, and described pressing piece is a hollow rod member;
The connecting portion of described guide head and described guide rod forms a pressure-bearing surface and is used to accept exerting pressure from described pressing piece; Also be provided with a plurality of buckles that are used for the described zone of aeration of hook on the described pressure-bearing surface; Described buckle is semi-circular and has an one way valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910049213 CN101538851A (en) | 2009-04-13 | 2009-04-13 | Construction technology for reinforcing soft soil foundation by transverse pressurization and dedicated aeration zone press-in device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910049213 CN101538851A (en) | 2009-04-13 | 2009-04-13 | Construction technology for reinforcing soft soil foundation by transverse pressurization and dedicated aeration zone press-in device |
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| CN101538851A true CN101538851A (en) | 2009-09-23 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587348A (en) * | 2012-03-22 | 2012-07-18 | 上海市城市建设设计研究总院 | Pressurizing and dewatering rod device |
| CN103243705A (en) * | 2013-05-30 | 2013-08-14 | 高远 | Expanding water absorption and drainage consolidation device |
| CN106638256A (en) * | 2017-02-14 | 2017-05-10 | 上海市城市建设设计研究总院（集团）有限公司 | Semi-integrated seamless bridge structure adaptive to soft foundation |
| CN106677073A (en) * | 2017-02-14 | 2017-05-17 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method for semi-integral jointless bridge structure adaptive to soft soil foundation |
-
2009
- 2009-04-13 CN CN 200910049213 patent/CN101538851A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102587348A (en) * | 2012-03-22 | 2012-07-18 | 上海市城市建设设计研究总院 | Pressurizing and dewatering rod device |
| CN102587348B (en) * | 2012-03-22 | 2015-02-25 | 上海市城市建设设计研究总院 | Pressurizing and dewatering rod device |
| CN103243705A (en) * | 2013-05-30 | 2013-08-14 | 高远 | Expanding water absorption and drainage consolidation device |
| CN106638256A (en) * | 2017-02-14 | 2017-05-10 | 上海市城市建设设计研究总院（集团）有限公司 | Semi-integrated seamless bridge structure adaptive to soft foundation |
| CN106677073A (en) * | 2017-02-14 | 2017-05-17 | 上海市城市建设设计研究总院（集团）有限公司 | Construction method for semi-integral jointless bridge structure adaptive to soft soil foundation |
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Open date: 20090923 |