CN106869153A - A kind of method of the quick soft soil foundation treatment of well-points dewatering - Google Patents

Abstract

The invention discloses a kind of method of the quick soft soil foundation treatment of well-points dewatering, comprise the following steps, the setting of well point, vacuum-dewatering, gravity are tamped and shaken and roll, repeating vacuum precipitation and gravity compacting step 2~3 circulation, remove drinking-water pipe, high pressure spray jetting mud, cement mortar maintenance and laying Horizon.The present invention is suitable for south China area level of ground water soft foundation processing higher, using vacuum well-point dewatering, gravity compacting vibrations roll and high pressure jet grouting comprehensive processing method, with adapting to, wide, earthwork transportation quantities is small, will not form " rubber layer " in foundation surface, the advantage of construct simple, short time limit and low cost.

Description

A kind of method of the quick soft soil foundation treatment of well-points dewatering

Technical field

The present invention relates to civil engineering foundation treatment technology field, the especially a kind of quick soft soil foundation treatment of well-points dewatering Method.

Background technology

Either highway construction, warehouse Horizon and parking space, the harm that soft soil foundation is caused to it can not despise, Prior art is many to the processing method of subgrade, for example, vacuum method, replacement cushion method, heavy-tamping method and geotextile add Gu method, the problem for existing is that vacuum method is long in time limit, the drainage belt squeezed into soil can produce the consequent effects such as ponding；Soil removal and replacement Sand-gravel-cushion Technioue is big due to earthwork transportation quantities, when that cannot solve backfill nearby, causes earthwork transportation quantities to be multiplied； Although heavy-tamping method solves the problems, such as earthwork transportation engineering, because underground water is mishandling, or after underground water discharge and repeatedly Immersion, easily forms " rubber layer " in foundation surface, and especially in construction of the highway engineering, " rubber layer " ground is also easy to produce wriggling, It is difficult to control to, causes foundation instability；Geotextile method for strengthening need to be buried in soil layer the larger geotextile/polymer of intensity, lacing wire, Stressed member etc., this artificial compound soil body ground, although foundation bearing capacity can be improved, reduces sedimentation and increases ground Stability, but earthwork transportation quantities is big, constructs complex and high cost.

The content of the invention

The quick soft soil foundation treatment of a kind of well-points dewatering that the purpose of the present invention is directed to the deficiencies in the prior art and provides Method, the method is applied to south China area level of ground water soft foundation processing higher, is rammed using well point vacuum-dewatering, gravity Reality and high pressure spray jetting mud slurry comprehensive processing method, with adapt to wide, earthwork transportation quantities it is small, will not be in ground base table Face forms " rubber layer ", the advantage of simple and low cost of constructing.

Realizing the concrete technical scheme of the object of the invention is：

A kind of method of the quick soft soil foundation treatment of well-points dewatering, the method is applied to south China area higher soft of level of ground water Basement process, its feature comprises the following steps：

a）, well point setting

Arrange well point by design requirement, well point position drilling well or rush well, setting is furnished with the well casing of mesh, back-up sand gravel, sets Drinking-water pipe and connect vavuum pump, with film shunt in a well mouth；

b）, vacuum-dewatering

Deep-well precipitation is implemented using negative pressure air fluidics, is extracted out the water in well point by drinking-water pipe, reduced in ground Water level；

c）, gravity tamps and shakes and roll

With dynamic compaction machinery, the hammer ram of 100~300KN is lifted to 15~40 meters of height, freely fallen, multiple spot is tamped repeatedly, most Vibrations afterwards are rolled；

d）, repeating vacuum precipitation and gravity compacting step

Repeat b）Vacuum-dewatering and c）Gravity tamps step, two to three circulations；

e）, well head film unpacking

The well head that opening is closed with film, keeps the sandy gravel stratum of well point and the gas permeability on ground；

f）, remove drinking-water pipe

The connection of drinking-water pipe and vavuum pump is disconnected, dismounting is arranged on the drinking-water pipe in well casing；

g）, high pressure spray jetting mud

With high-pressure injection method in well casing grout injection, cement mortar extruded to sandy gravel stratum, water by the mesh on well casing tube wall Mud is risen by bottom until overflowing ground；

h）, cement mortar maintenance

Water seasoning, until cement slurry sets；

i）, laying Horizon

Colligation Horizon reinforcing bar, reinforcing bar in the position for being provided with well point overlapped and welded with well casing, casting concrete Horizon, until supporting Shield is completed.

The present invention is directed to south China area level of ground water soft foundation processing higher, using well point vacuum-dewatering, gravity Compacting and high pressure spray jetting mud slurry comprehensive processing method, with adapt to wide, earthwork transportation quantities it is small, will not be in ground Surface forms " rubber layer ", the advantage of simple and low cost of constructing.

Brief description of the drawings

Fig. 1 is the structural representation of vacuum-dewatering well point of the present invention；

Fig. 2 is the structural representation of cement mortar of the present invention and Horizon；

Fig. 3 is the floor map that well point of the present invention is set.

Specific embodiment

Embodiment

The present invention comprises the following steps suitable for south China area level of ground water soft foundation processing higher, ties below The present invention is further described as follows for the conjunction embodiment of the present invention and accompanying drawing：

a）, well point setting

Refering to Fig. 1, Fig. 3, well point 1 is arranged away from 4 m by the m of line-spacing 4 of design requirement, row, drilling well is implemented in each position of well point 1 Or high pressure water flushing well, motor-pumped well diameter：200~300 mm, motor-pumped well depth：6~20 m, fill gravel 3, thickness in motor-pumped well：200 ~400mm；To be furnished with tube wall under the well casing 2 of mesh to the gravel 3 of motor-pumped well bottom；Filled out in motor-pumped well along the periphery of well casing 2 Gravel 3 is filled, until ground；Drinking-water pipe 4 is set in well casing 2 and vavuum pump 5 is connected；Well casing mouthful and well head are closed with film 6, Setting completed for well point 1.

b）, vacuum-dewatering

Refering to Fig. 1, Fig. 3, deep-well precipitation is implemented using negative pressure air fluidics, open vavuum pump 5, by drinking-water pipe 4 by well Water in point 1 is extracted out, reduces the water level in subgrade；

c）, gravity tamps and shakes and roll

With dynamic compaction machinery, the hammer ram of 100~300KN is lifted to 15~40 meters of height, freely fallen, multiple spot is tamped repeatedly, most Vibrations afterwards are rolled；

d）, repeating vacuum precipitation and gravity compacting step

Refering to Fig. 1, Fig. 3, b is repeated）Vacuum-dewatering and c）Gravity is tamped and is shaken and rolls step, implements three circulations；

e）, well head film unpacking

Refering to Fig. 2, Fig. 3, the well head closed with film 6 is opened, keep 3 layers of the gravel of well point 1 and the gas permeability on ground；

f）, remove drinking-water pipe

Refering to Fig. 2, Fig. 3, the connection of drinking-water pipe 4 and vavuum pump 5 is disconnected, dismounting is arranged on the drinking-water pipe 4 in well casing；

g）, high pressure spray jetting mud

Refering to Fig. 2, Fig. 3, with high-pressure injection method in well casing 2 grout injection 7, cement mortar 7 is by the mesh on the tube wall of well casing 2 In extruding to gravel 3, cement mortar 7 is risen by bottom until overflowing ground；

h）, cement mortar maintenance

Refering to Fig. 2, Fig. 3, water seasoning, until cement mortar 7 solidifies；

i）, laying Horizon

Refering to Fig. 2, Fig. 3, reinforcing bar 8 is overlapped and welded, poured by colligation Horizon reinforcing bar 8 in the position for being provided with well point 1 with well casing 2 Concrete Horizon 9, until maintenance is completed.

The present invention is intended to going along with sb. to guard him for soft soil foundation treatment and is determined by design, and is completed before the setting of well point 1 and vacuum-dewatering.

High pressure jet grouting of the invention is the bottom for the Grouting Pipe with nozzle being reached well casing 2, then will from nozzle Cement mortar 7 is ejected, and cement mortar 7 is extruded to 3 layers of gravel by the mesh on the tube wall of well casing 2, and by gravel 3 bottom by Gradually rise until overflowing ground.

The present invention rolls the method for replacing construction, repeating vacuum precipitation and gravity using vacuum-dewatering and gravity compacting vibrations Compacting vibrations roll step 3 circulation, and the method for alternating construction can mitigate the water pressure of subgrade, improve subgrade Compression property, improves the modulus of compressibility of subgrade, to reduce the sedimentation of ground.

The present invention is starched, cement on the basis of the change of subgrade soil structure by the inner high voltage gunite of well casing 2 Slurry 7 makes well casing 2 cylinder for consolidation be formed in subgrade layer for 3 layers with gravel, because well point of the invention 1 is by line-spacing 4 M, row are away from 4 m arrangements, therefore, the cylinder being distributed on subgrade forms the support column in rectangular setting, in laying mixed When solidifying soil puts down 9, Horizon reinforcing bar 8 is overlapped and welded with well casing 2, and support column constitutes the support to concrete Horizon 9 again, is improved The intensity and stability of concrete Horizon 9.

During colligation Horizon reinforcing bar 7, Horizon reinforcing bar 7 is overlapped and welded with well casing 2 in the position for being provided with well point 1, and in branch Casting concrete Horizon 9 on dagger, until maintenance is completed, soft foundation processing is finished；Horizon reinforcing bar 7 is overlapped and is located at well casing 2 Structure on support column can improve foundation bearing capacity, reduce sedimentation.

Claims (1)

1. the method for the quick soft soil foundation treatment of a kind of well-points dewatering, it is higher that the method is applied to south China area level of ground water Soft foundation processing, it is characterised in that it comprises the following steps：

a）, well point setting

Arrange well point by design requirement, well point position drilling well or rush well, setting is furnished with the well casing of mesh, back-up sand gravel, sets Drinking-water pipe and connect vavuum pump, with film shunt in a well mouth；

b）, vacuum-dewatering

Deep-well precipitation is implemented using negative pressure air fluidics, is extracted out the water in well point by drinking-water pipe, reduced in ground Water level；

c）, gravity tamps and shakes and roll

With dynamic compaction machinery, the hammer ram of 100~300KN is lifted to 15~40 meters of height, freely fallen, multiple spot is tamped repeatedly, most Vibrations afterwards are rolled；

d）, repeating vacuum precipitation and gravity compacting step

Repeat b）Vacuum-dewatering and c）Gravity tamps step, two to three circulations；

e）, well head film unpacking

The well head that opening is closed with film, keeps the sandy gravel stratum of well point and the gas permeability on ground；

f）, remove drinking-water pipe

The connection of drinking-water pipe and vavuum pump is disconnected, dismounting is arranged on the drinking-water pipe in well casing；

g）, high pressure spray jetting mud

With high-pressure injection method in well casing grout injection, cement mortar extruded to sandy gravel stratum, water by the mesh on well casing tube wall Mud is risen by bottom until overflowing ground；

h）, cement mortar maintenance

Water seasoning, until cement slurry sets；

i）, laying Horizon

Colligation Horizon reinforcing bar, reinforcing bar in the position for being provided with well point overlapped and welded with well casing, casting concrete Horizon, until supporting Shield is completed.