CN206015653U - A kind of pipe of reinforced soft soil ground is rammed - Google Patents

Abstract

This utility model is related to a kind of pipe of reinforced soft soil ground and rams, combined with vibration hammer by pipe will be rammed, pipe both sides are rammed, vacuum dehydration pipe is set, charging aperture is set on pipe is rammed, rams pipe built-in pipe hammer ram, the lifting of pipe hammer ram is made using the opening and closing of pincerlike detacher and is come off, the tamping energy and reinforcement criteria needed for reaching；During ramming, draw water when ramming, reach the purpose of super quiet pore pressure after rapid dispersion is rammed；To the current-formed silt soil that cannot be rammed, the preferable soil of soil property is injected by charging aperture and enters line replacement, the place after reinforced process reaches the bearing capacity index of preferable compactness.This utility model construction procedure is simple, cycle is short, low cost, by compacting from deep to shallow, significantly improves can the bearing eigenvalue of foundation soil in reinforcing scope, change significantly the mechanics index of physics of weak soil；Consolidation process can be carried out to the weak soil of any property by controlling the displacement of tamping energy and required thickness, which reinforces thickness up to 20～30m.

Description

A kind of pipe of reinforced soft soil ground is rammed

Technical field

This utility model is related to a kind of pipe of reinforced soft soil ground and rams, it is adaptable to can not meet design to place and hold The weak soil soil stabilization for carrying power and compactness is processed, possession base processing technology field.

Background technology

At present, reinforced soft soil ground is widely applied strong tamping technology, by heavy tamping energy pair by dewatering measure The soil body is rammed procedure coercion compression or hits close, can reach the discharge of gas and the rising of pore water pressure in the soil body；Cause the soil body Liquefaction or soil structures destruction；Soil mass crack development is produced, changes the infiltration coefficient of the soil body, as pore pressure disappears after rammer Dissipate, soil strength is improved, thixotroping recovers to reach consolidation.

In substantial amounts of soft soil foundation dynamic consolidation construction case, the principle of " hit multipass, first light rear weight less, add energy step by step " is soft Native foundation dynamic consolidation successful Application is laid a good foundation；According to tamping energy and reinforcement depth and the relation of level of ground water, soft soil foundation Strong rammer effective reinforcement depth is usually the 1/4 of tamping energy, it is contemplated that the drawdown of level of ground water adds 1～2m be effectively reinforce deep Degree.

With the development of China's manufacturing industry, determine that the super-tonnage crane of strong rammer tamping energy is applied to the strong of high-energy Construction is rammed, maximum tamping energy can reach 12,000,000 Ns of rice at present, but show through high-energy dynamic compaction Construction practices, soft soil foundation Using the tamping energy of high-energy, the reinforcement depth of weak soil is not extended, and is easily caused " spring soil " on the contrary, is caused weak soil Ground cannot recover foundation strength after ramming, or even destroy soil structures.Trace it to its cause, the soil condition of soft soil foundation and underground Water level and hammer ram act on every thixotroping mechanism of weak soil and heavy tamping energy is rammed procedure coercion compression or hits Mi Qiguan to the soil body Being extremely complex, being not effective reinforcement depth to be reached by raising tamping energy merely, the maximum that can be born in weak soil is rammed Can, that is, optimum tamping energy, it is necessary to just right, cross and can then produce punch-through, form shape in " spring soil " engineering practice This is likened to elephant " battering down ".

Thus, the reinforcement depth in soft soil foundation strong rammer rests on shallow layer reinforcement to the application of strong rammer technique always, typically Strong rammer effective reinforcement depth is adopted for 4～6m, after dewatering measure is set, carries out strong rammer, its effective reinforcement depth also with regard to 6～ 8m, adopts Dewatering dynamic compaction in the preferable soft soil foundation of soil structure, and tamping energy is in 12,000,000 ns/m of practice there be its maximum Effect reinforcement depth reaches 14m.But its cost is high, work efficiency is slow, it is impossible to suitable for large scale application.

In order to reach the purpose of weak soil deep-layer reinforcing, engineers and technicians adopt deep layer explosion, backfill Building wood after explosion Material, then adopts strong rammer technique, final result namely to be replaced deep layer weak soil, cannot still solve the difficulty of deep-layer reinforcing Topic.

The effective reinforcement depth of strong rammer always perplexs the subject matter of the deep-layer reinforcing of soft soil foundation, engineers and technicians By steel pipe being built in desired depth, carry out strong rammer by hanging hammer ram, but meet the full deep layer of silt soil or level of ground water, warp Experiment soil strength is improved seldom, and the soil body is longer for recovery time, such as backfills its effect after the preferable earth material of live soil property is rammed Not substantially, key is that tamping point water content is too high, directly affects the consolidation effect of strong rammer.

In sum, soft soil foundation adopts strong rammer technique, and reinforcement depth is limited；Even if adopting high-energy dynamic compaction, due to into This height, long in time limit, and easily batter down the soil body；Hang to ram after steel pipe being inserted in weak soil and strong rammer is carried out to deep layer, due to underground Water level and water content of soil are too high, and after rammer, soil strength is improved seldom, and effect is not obvious, and recovery time is long.

Utility model content

For solving above-mentioned technical problem, the purpose of this utility model is to provide a kind of pipe of reinforced soft soil ground and rams, profit With the construction method of evacuation after strong rammer, rammer in pipe, convection current is moulded shape weak soil and is replaced by local and be aided with dewatering measure, to reach Quick change weak soil intensity, quickly raising foundation bearing capacity, eliminate the purpose of settlement after construction.

The pipe of reinforced soft soil ground of the present utility model is rammed, by tip, rammer pipe and vibration hammer, the pincers be made up of steel pipe Shape detacher, the assembling of pipe hammer ram are constituted, and the both sides for ramming pipe are disposed with vacuum dehydration pipe, outer wall of the rammer pipe near the mouth of pipe On be provided with and described ram the charging aperture that connects inside pipe；Water strainer is provided with the vacuum dehydration pipe, is wrapped on the water strainer It is wrapped with filter screen.

Further, the vibration hammer is connected on the mouth of pipe for ramming pipe, and the vibration hammer includes absorbing frame and vibration Device, is connected by vibrator spring between the absorbing frame and vibrator, and the absorbing frame is provided with pulley and crampon, institute State pulley to connect steel cable and be connected with the pincerlike detacher by wearing.

Further, the pincerlike detacher includes that the U-shaped shackle being connected with steel cable, the shackle end are connected with shackle Pin, is connected with two semicircular pincerlike tripping gears on the shackle pin, arrange on one of them described pincerlike tripping gear Control steel cable tightens up/loosens, make described in two the fixing point that pincerlike tripping gear opens or close, described unload to buckle also be covered with cone Shape cover.

Further, the pipe hammer ram includes the first hammer body for connecting from top to bottom and the second hammer body, first hammer body The hook that end is provided with several passages and is connected with for the pincerlike tripping gear, the diameter of second hammer body are little In first hammer body diameter with to the pipe hammer ram position.

Further, overcoat is arranged with also on the water strainer, outer the putting is provided with some through holes.

Further, the filter screen is the nylon leaching net of 100 mesh, is enclosed with 2～3 layers of the nylon on the water strainer Filter screen.

By such scheme, this utility model at least has advantages below：

1st, pass through vacuum dehydration pipe to be arranged on pipe is rammed, can ram deep soil Binding in vivo water when pipe rammer is carried out Effect is lower to discharge the soil body, can deep layer Dewatering dynamic compaction, and can rapid dispersion ram after the soil body super quiet pore pressure；

2nd, pass through to arrange charging aperture on pipe is rammed, the soil property little to interlayer soil infiltration coefficient can be by charging aperture input preferably Soil property enter line replacement, reach change soil nature effect, solve the deficiency of existing traditional handicraft soft soil foundation deep-layer reinforcing；

3rd, tip can block up stream modeling shape soil absolutely and enter in rammer pipe, and mitigate the soil body to ramming the frictional force of pipe；

4th, pipe hammer ram is arranged in rammer pipe, freely falling body mode of the pipe hammer ram in rammer pipe, can compared with hook strong rammer Reach thing half and cross effect again；

5th, the structure of pipe hammer ram can prevent hammer partially.

Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model Art means, and being practiced according to the content of description, with preferred embodiment of the present utility model and coordinate accompanying drawing detailed below Describe in detail bright as after.

Description of the drawings

Fig. 1 is structural representation of the present utility model；

Fig. 2 is the structural representation for ramming pipe and tip in this utility model；

Fig. 3 is vibration hammer pulley attachment structure schematic diagram in this utility model；

Fig. 4 is the structural representation of pincerlike detacher in this utility model；

Fig. 5 is the structural representation of pipe hammer ram in this utility model；

Fig. 6 is pipe hammer ram top plane view.

In figure：1st, crampon, 2, vibration hammer, 21, pulley, 22, absorbing frame, 23, spring, 24, vibrator, 3, pincerlike de- Hook device, 31, steel cable, 32, cone-shaped hood, 33, shackle, 34, shackle pin, 35, pincerlike tripping gear, 36, fixing point, 4, pipe hammer ram, 41st, passage, 42, hook, the 43, first hammer body, the 44, second hammer body, 5, ram pipe, 51, the mouth of pipe, 52, charging aperture, 53, vacuum inhales Water pipe, 54, water strainer, 55, overcoat, 56, through hole, 57, ram pipe reinforcement, 6, tip, 61, tip item, 62 tip bottoms.

Specific embodiment

With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below Embodiment is used for this utility model to be described, but is not limited to scope of the present utility model.

As shown in Figures 1 to 6, the pipe of reinforced soft soil ground of the present utility model is rammed, by the tip being made up of steel pipe 6th, ram pipe 5 to constitute with vibration hammer 2, pincerlike detacher 3, the assembling of pipe hammer ram 4.

Ramming pipe 5 and adopting steel pipe manufacturing, vacuum dehydration pipe 53 is arranged in the both sides of pipe shaft outer wall, 53 bottom of vacuum dehydration pipe sets Water strainer 54 is put, and 2～3 layers is wrapped up with the nylon leaching net of 100 mesh；For preventing the abrasion of water strainer 54 in work progress, in filter Water strainer overcoat 55, holes drilled through 56 on 54 overcoat 55 of water strainer are set on hydrophone 54（Aperture 0.05cm）, institute is sunk to when pipe 5 is rammed Depth is needed, vacuum pump is opened and is carried out in vacuum-dewatering work progress and under conditions of vacuum is drawn water during ramming, because of vacuum Suction function, in the soil body substantial amounts of Free water and the pore pressure water after ramming in the soil body by overcoat 55, nylon leaching net through drainage Device 54 enters vacuum dehydration pipe 53, and discharges the soil body by vacuum dehydration pipe 53.5 mouth of pipe 51 of pipe is being rammed, lower end also sets up charging Mouth 52, when, in work progress, chance current-formed silt cannot be tamped or meet generation " cavity " after clay is rammed, then can pass through the charging Mouth pours into live preferably earth material, reaches the effect of displacement, different so as to ensure that the utility model can be suitably used for different thickness The consolidation process of soil property.

Ram pipe 5 bottom and be provided with rammer pipe reinforcement 57, it is to avoid be that tip 6 is caused to damage ramming, tip item 61 straight Footpath is the internal diameter for ramming pipe 5, tip 6 is inserted in rammer pipe 5, and tip bottom 62 is buried portion for tip, can be according to pipe tamping point before construction Arrangement grid, bury pre-buried for tip portion, during construction need only will ram pipe box on tip can open vibration hammer by ram pipe beat Enter desired depth.It is to block up stream modeling shape soil absolutely to enter in rammer pipe which acts on, and mitigates frictional force of the soil body to steel pipe.Tip belongs to one Secondary property, buries with steel pipe when reaching certain depth and carrying out strong rammer, under hammer ram effect, is rammed into the soil body, can use certain proportioning Concrete, or be made with other materials.

The connection vibration hammer 2 of the mouth of pipe 51 of pipe 5 is rammed, vibration hammer adopts electronic or hydraulic pressure, the vibration hammer that pipe is rammed to select root Determine according to soil condition and the diameter for ramming pipe, according to Theoretical Calculation：Improve excited frequency soil not only can be reduced to ramming pipe Side frictional resistance, and the acceleration of motion for ramming pipe can be more effectively improved than improving amplitude, so as to improve the speed of immersed tube. But excited frequency is too high to cause power to increase excessively, therefore, should also consider when excited frequency is determined.Vibration hammer connects On the mouth of pipe for ramming pipe, vibration hammer includes absorbing frame 22 and vibrator 24, passes through vibrator between absorbing frame 22 and vibrator 24 Spring 23 connects, and absorbing frame 22 is provided with pulley 21 and crampon 1, and pulley 21 connects steel cable 31 with pincerlike detacher 3 by wearing Connection, hoisting winding make pincerlike detacher 3 or upper or lower motion by the steel cable forward or reverse.

Strong rammer adopts traditional freely falling body form, the safety of main consideration equipment and consolidation effect, freely falling body side Formula compared with hook strong rammer can reach thing half and cross effect again, as the freely falling body mode of pipe hammer ram 4 is realized in rammer pipe , it is in rammer pipe 5 to realize, therefore, suspension hook and hammer handle with the hammer that rises that existing strong rammer difference is exactly pipe hammer ram 4 with hook Combination using pincerlike mode, and its opening and closing is controlled by steel cable.Pincerlike detacher 3 is by 31 joining shackle 33 of steel cable, shackle Two semicircular pincerlike tripping gears 35 are installed at pin 34, control are provided with the pincerlike tripping gear of one piece of semicircle wherein The fixing point 36 of steel cable, by tightening up or loosening the steel cable, can make pincerlike tripping gear 35 open or close, so that pipe hammer ram Disengagement steel cable or lift pipe hammer ram.Pincerlike detacher also sets up a cone-shaped hood 32, and it is the pincerlike detacher 3 of protection and pipe which acts on The junction of hammer ram 4, while also have the guide effect for making the crawl pipe of pincerlike detacher 3 hammer ram 4 link up with 42.

Pipe hammer ram 4 is made using cast steel, and diameter is less than and rams pipe 10cm, to ensure that pipe hammer ram is not touched during free-falling Rammer pipe 5 is hit, its tamping energy is affected.The determination of tamping energy according to：Hammer weight × height determines.Pipe hammer ram top is provided with passage 41, it is to reduce suction of the soil body to pipe hammer ram after rammer which acts on, and the number of passage is determined according to the diameter of pipe hammer ram, generally 2～4；First hammer body 43 of pipe hammer ram is provided with hook 42, the connection of hook 42 and pincerlike tripping gear by steel cable control, When pincerlike detacher opens, pipe hammer ram is not controlled by pincerlike detacher, and is fallen automatically, and the soil body is rammed；Pipe is rammed Second hammer body, the 44 hammer ram position portion of hammer, it is when weak soil soil property is rammed which acts on, and can prevent hammer partially, when to weak soil soil When body is rammed, the second hammer body 44 is introduced into the soil body and weak soil is extruded, and then the first hammer body 43 is again in compacted soil Rammed on body, be ram after pincerlike detacher quickly capture pipe hammer ram and create conditions.

Rammed using above-mentioned pipe as follows to the method for reinforced soft soil ground：

1st, position：According to soil condition and reinforcement depth, determine the diameter and length for ramming pipe, after being connected with vibration hammer, carry Rise and ram pipe, arrangement rams point on tamping point, pipe box will be rammed on the shoe for ramming point, vibration hammer is then turned on, will ram needed for pipe squeezes into Depth.

2nd, connect vacuum dehydration pipe, using the pincerlike detacher of the lifting pulley connection increased on vibration hammer, pincerlike detacher Sling hammer ram.

21st, the vacuum dehydration pipe of pipe both sides is rammed in connection, and is connected by soft rubber tube with vacuum pump, confirms to be tightly connected Afterwards, open vacuum pump to draw water；

22nd, at the same time, the pincerlike detacher of lifting pulley connection, is sling by pincerlike detacher and rams pipe, and pipe hammer ram is inserted Ram after desired depth being reached in pipe, gently ram 2～3 and hit（Under conditions of pincerlike detacher keeps connection status with hammer ram）Open afterwards and shake Dynamic hammer, vibration lift rammer pipe, and now in ttom of pipe, pincerlike detacher is hooked on the hook handle of hammer ram pipe hammer ram in closure state；

23rd, vibration hammer puies forward the distance for ramming pipe, is determined according to soil condition, is 2～3m of lifting to the maximum, closes vibration hammer, stops Only lifted, the distance of slinging of pipe hammer ram controls distance of slinging by pincerlike detacher control steel cable, carries out a rammer, ram for 2～3m Several according to soil condition determine, the last straw ramming volume control in 10cm scopes；

24th, by carrying rammer pipe step by step, the method that tamps step by step, until earth's surface.During actual pipe is rammed, such as silt soil Layer, pipe ram tamping energy grasp " hit less carry less, first light after weight " principle, also scene preferably soil property can be added to carry out in charging aperture Displacement compacting, for argillic horizon produces " cavity " phenomenon, then also can add scene preferably soil property in charging aperture, be tamped；

25th, during carrying rammer pipe or ramming, vacuum dehydration is kept, can not only reduces the water content of the soil body, Er Qiejia The pore pressure dissipation of the soil body, the consolidation effect needed for reaching after fast rammer；

26th, after the completion of pipe tamping point, can shift carries out the construction of next pipe tamping point；

27th, pipe tamping point arrangement grid according to geological conditions and rams pipe diameter determination, to the preferable soil property of infiltration coefficient, layouts Network is 4.0m equilateral triangles, to the less soil property of infiltration coefficient, then can arrange by 2.0m equilateral triangles；

28th, such as muck soil body construction, after ramming pipe and being driven into desired depth in the presence of vibration hammer, you can open vacuum Pumping takes the subsoil water of subjacent bed certain depth, while putting into scene preferably soil property in charging aperture, notices that pipe is rammed in charging Hammer must be promoted to the mouth of pipe, allow the earth material of addition to be rammed after pouring into desired location；

29th, such as argillic horizon, " cavity " phenomenon after rammer, can be then produced, when the situation is found, pipe hammer ram is promoted to the mouth of pipe, Soil property is put in charging aperture, earth material is rammed after pouring into desired location.

3rd, dewatering measure is aided in

31st, for guaranteeing to need reinforcing area not affected by peripheral water, further improve downcomer and ram method for strengthening effect, needing Peripheral seal wall is set up outside reinforcing area sideline at 3～5m.

Method of the peripheral seal wall by Dust Deep Stir stake, stake footpath 70cm, stake overlap 20cm, stake embedded depth root with stake According to need reinforcement depth determine, wherein it should be specifically noted that need reinforcement depth scope intraformational bed soil infiltration coefficient, to infiltration coefficient compared with Big soil layer, needs stir is sprayed more more.Stirring material can be gathered materials on the spot, and typically with mud or clay, wherein yellow clay is optimal, mixes Measure as 15%～20%.

32 while need reinforcing area efficiency of construction and construction quality to improve, and needs reinforcing area arrange certain pipe Well precipitation network, precipitation pipe well adopt PVC ripple chimney filters, and caliber is 25cm～60cm, arranges filter in PVC ripple chimney filters tube wall Press the nylon after 0.2m～0.5 spacing etc. divides arrangement, filter opening to be provided with 80 mesh of tube wall outer wrapping from top to bottom and filter in hole, filter opening 2～3 layers of net, or generation is arranged with geotechnique.Tubes welding can be determined according to the infiltration coefficient of geological conditions and soil, generally 15m × 15m, pipe well bury deep according to needing reinforcement depth to determine.

Tube well dewatering releases weight principle using waterpower, can quick lowering of watertable, and drawdown buries depth up to pipe well The 2/3 of degree.As large area soft foundation processing, its application is quite varied, and effect is fairly obvious.Reduced by tube well dewatering Level of ground water, is that downcomer quickly drawing water for method for strengthening of rammer creates conditions.

4th, shallow-layer dynamic compaction

The soft soil foundation that need to be reinforced, rams set up peripheral seal, pipe well network precipitation ancillary method downcomer is met Under, deep soil its soil bearing capacity eigenvalue under conditions of pipe is rammed and drawn water is significantly improved, and level of ground water is then reduced to pipe The 2/3 of well embedded depth.On this basis, shallow-layer is aided with dynamic consolidation again, not only can improve soil bearing capacity eigenvalue, more may be used Settlement after construction, relative settlement and the rate of settling are further eliminated.

Above-mentioned reinforcement means has the advantages that：

1st, implement simply, applied widely

The method that pipe rammer is carried out to the soft soil foundation for needing reinforcing area is rammed by pipe, forces deep soil Binding in vivo water ramming The soil body is discharged under the effect of hitting, the vacuum dehydration bank of tubes for being arranged on tube wall goes out, and has both reached deep layer Dewatering dynamic compaction, quickly can disappear again The super quiet pore pressure of the soil body after ramming is dissipated, is to accelerate soil stabilization to have established solid foundation；The soil property little to interlayer soil infiltration coefficient By replacing preferable soil property, the effect for changing soil nature is reached, existing traditional handicraft soft soil foundation deep-layer reinforcing is solved not Foot；Method for strengthening is rammed by downcomer, during the consolidation process to large-area soft ground, coefficient of permeability K is applicable not only to The soil layer of the hypotonicities such as the soil property of≤0.1m/d such as very soft sill clay, the solid reinforcement for hypotonicity provide one kind Brand-new reinforcing and processing method；But also it is applied to the preferable soil property of the infiltration coefficient such as soil property such as hydraulic fill sand, interlayer flour sand；Through this After technique consolidation process, the characteristic load bearing capacity of the soil body can be significantly improved.

2nd, the engineering time is short, and speed is fast, low cost, and cost performance is high

Directly by deep layer Dewatering dynamic compaction, deep-layer reinforcing equipment and technology is initiated, can be rammed by changing according to design requirement Hit and can reach technical specification, its settlement after construction of reinforcement means and the rate of settling from deep to shallow do not become with the change of working load Change, the impact of settlement after construction and the rate of settling can be substantially eliminated；Due to being rammed with reference to pipe by precipitation, consolidation time is short, reinforces speed Degree is fast, and integrated cost is low, is that other techniques are beyond one's reach.

3rd, deep layer precipitation, efficiency high, consolidation effect are obvious

Ram in Precipitation Process in pipe in the invention, be aided with precipitation envelope wall, tube well dewatering and shallow-layer dynamic consolidation, make the soil body Mechanics index of physics is greatly changed, particularly the consolidation process to interlayer soil, the method by replacing, so that need to add Gu soil body shape all-in-one-piece depth hard formation；Its reinforcement depth can pass through the placed-depth control for ramming pipe, be easy to the prison of work progress Superintend and direct and manage, reach and reinforce closely knit effect, while for reducing settlement after construction, improve soft soil foundation bearing capacity established solid Basis, therefore, the method is applied to the consolidation process of road, place, underground piping etc..

The above is only preferred implementation of the present utility model, is not limited to this utility model, it is noted that For those skilled in the art, on the premise of without departing from this utility model know-why, can also do Go out some improvement and modification, these improvement and modification also should be regarded as protection domain of the present utility model.

Claims (6)

1. a kind of pipe of reinforced soft soil ground is rammed, it is characterised in that：By the tip be made up of steel pipe, ram pipe and vibration hammer, Pincerlike detacher, the assembling of pipe hammer ram are constituted, and the both sides for ramming pipe are disposed with vacuum dehydration pipe, and the rammer pipe is near the outer of the mouth of pipe It is provided with wall and the charging aperture for ramming and connecting inside pipe；Water strainer is provided with the vacuum dehydration pipe, on the water strainer It is enclosed with filter screen.

2. the pipe of reinforced soft soil ground according to claim 1 is rammed, it is characterised in that：The vibration hammer is connected to described Ram on the mouth of pipe of pipe, the vibration hammer includes absorbing frame and vibrator, between the absorbing frame and vibrator, pass through vibrator bullet Spring connects, and the absorbing frame is provided with pulley and crampon, and the pulley connects steel cable with the pincerlike detacher company by wearing Connect.

3. the pipe of reinforced soft soil ground according to claim 2 is rammed, it is characterised in that：The pincerlike detacher include with The U-shaped shackle of steel cable connection, the shackle end is connected with shackle pin, is connected with two semicircular pincers on the shackle pin Tripping gear, arranges control steel cable and tightens up/loosen, makes pincerlike tripping gear described in two on one of them described pincerlike tripping gear The fixing point for opening or closing, described unload to buckle also be covered with cone-shaped hood.

4. the pipe of reinforced soft soil ground according to claim 1 is rammed, it is characterised in that：The pipe hammer ram include from upper and First hammer body and the second hammer body of lower connection, the first hammer body end be provided with several passages and with for the pincer The hook of tripping gear connection, the diameter of second hammer body are less than the diameter of first hammer body with fixed to the pipe hammer ram Position.

5. the pipe of reinforced soft soil ground according to claim 1 is rammed, it is characterised in that：Also it is arranged with the water strainer Overcoat, outer the putting are provided with some through holes.

6. the pipe of reinforced soft soil ground according to claim 5 is rammed, it is characterised in that：The filter screen is the Buddhist nun of 100 mesh Imperial filter screen, is enclosed with 2～3 layers of the nylon leaching net on the water strainer.