CN112127343B - Dynamic compaction perforation construction device and construction method for soft soil foundation - Google Patents
Dynamic compaction perforation construction device and construction method for soft soil foundation Download PDFInfo
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- CN112127343B CN112127343B CN202010839355.5A CN202010839355A CN112127343B CN 112127343 B CN112127343 B CN 112127343B CN 202010839355 A CN202010839355 A CN 202010839355A CN 112127343 B CN112127343 B CN 112127343B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Abstract
The invention discloses a dynamic compaction perforation construction device for a soft soil foundation, which comprises: the device comprises an insulating layer, an upper shell, screws, a perforation unit, an igniter string connector, a bone material groove, a perforation, a discharge valve and a lower shell; the dynamic compaction construction method adopting the dynamic compaction perforation construction device for the soft soil foundation comprises the following steps: digging open channels around an area to be tamped, arranging a freezing pile foundation, perforating at the bottom of the area to be tamped, filling aggregate into the perforations, tamping by adopting a special-shaped perforated rammer, draining water, draining the water in the perforated well to the open channels, covering a sealing cover on the mouth of the perforated well, vacuumizing for 24 hours, draining the water again, backfilling the aggregate to the perforated well, and forcibly tamping a soft soil foundation by adopting a common rammer. The device has simple structure, can be assembled according to the actual construction requirement, has strong adaptability, adopts a method of extruding the transverse piles in the construction method, adopts a local extrusion mode, has the effect similar to that of an extruder, can effectively discharge the water in the soft soil foundation, and prevents rubber soil from being formed in the dynamic compaction process.
Description
Technical Field
The invention relates to the technical field of soft soil foundation reinforcement. More specifically, the invention relates to a dynamic compaction perforation construction device and a construction method for a soft soil foundation.
Background
The soft soil foundation refers to a soft soil layer with low strength and high compression amount, and most of the soft soil layer contains certain organic substances or has high water content. Because the soft soil has low strength and large sinking and hiding amount, great harm is often brought to road engineering, and if the treatment is improper, great influence is caused to the construction and the use of a road.
The existing soft soil foundation has various treatment modes according to the actual situation; for example, a drainage plate is arranged in a soft soil foundation area, a vibroflotation device is adopted to carry out vibroflotation pile construction, replacement and filling or a dynamic compaction technology is adopted to tamp soil; however, the arranged drainage plate is easy to block, the water outlet is limited, the vibration impact and replacement consume too much time, the construction progress is influenced, the dynamic compaction reaches a certain degree, and rubber soil is easy to generate due to the accumulation of the pressure of the water in the gap of the soft soil foundation, so that the tamping effect is poor.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a dynamic compaction perforation construction device and a construction method for the soft soil foundation, the device has simple structure, can be assembled according to the actual construction requirement, has strong adaptability, adopts a method of extruding and arranging transverse piles in the construction method, adopts a local extrusion mode, has the effect similar to that of an extruder, can effectively discharge the water in the soft soil foundation, and prevents rubber soil from being formed in the dynamic compaction process.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a dynamic compaction perforation construction device for soft soil foundation, comprising:
the upper part of the upper shell is connected with an upper connector for hoisting, the upper shell is hollow and is provided with an igniter assembly, the lower part of the igniter assembly is provided with an insulating layer, and the lower bottom surface of the upper shell is embedded with a main igniter string connector; the main igniter string connector is electrically connected with the igniter assembly; the lower edge of the upper shell is in an inverted step shape, and a plurality of screw holes are uniformly arranged at intervals in the circumferential direction on the outer edge of the step-shaped structure at the bottommost part;
the top surface of the perforation unit is inwards sunken to form a splicing groove, the splicing groove is matched with the lower part of the upper shell, a through perforation is arranged on the side wall of the splicing groove, the perforation corresponds to a screw hole in the upper shell, and the perforation unit is detachably connected with the lower part of the upper shell through a screw; an auxiliary igniter string connector is embedded in the bottom surface of the splicing groove and is electrically connected with the main igniter string connector; a bone material groove and an ammunition groove are arranged in the perforation unit, the bone material groove is vertically arranged, and the ammunition groove is obliquely arranged; the bone material groove is positioned at the upper part of the ammunition groove, the lower bottom surface of the bone material groove is communicated with the ammunition groove, and a discharge valve is arranged at the communicated part; the upper top surface of the bone material groove is communicated with the lower bottom surface of the splicing groove; the inclination angle of the ammunition groove is 3-5 degrees, one end of the ammunition groove, which is close to the central shaft of the perforation unit, is high, ammunitions are filled in the ammunition groove, the tail part of the ammunition groove is connected with a sub-igniter, and the sub-igniter is electrically connected with the serial connecting head of the sub-igniter; at least one perforation unit is arranged and spliced according to construction requirements; the lower bottom surface of the perforation unit is the same as the lower bottom surface of the upper shell, and a main igniter string connecting head is embedded in the perforation unit; the lower part of the perforation unit is in an inverted step shape, and a plurality of screw holes are uniformly arranged at intervals along the circumferential direction of the outer edge of the step shape;
the lower shell is of an inverted circular truncated cone-shaped structure and is inwards sunken to form a splicing groove, the splicing groove is matched with the lower portion of the upper shell, a through hole is formed in the side wall of the splicing groove, the through hole corresponds to a screw hole in the perforating unit, and the perforating unit is detachably connected with the upper portion of the lower shell through a screw.
A soft soil foundation dynamic compaction construction method adopting the soft soil foundation dynamic compaction perforation construction device comprises the following steps:
determining a region to be tamped according to a construction drawing, and excavating open channels along side lines on the periphery of the region to be tamped; embedding a freezing pile foundation in a position close to the open channel in the area to be compacted, wherein the freezing pile foundation is vertical pipe refrigeration equipment, and refrigeration is realized through a liquid-gas refrigerant or liquid nitrogen is adopted for refrigeration;
secondly, perforating a perforated well in the area to be tamped, perforating in the perforated well by using a soft soil foundation dynamic compaction perforation construction device, filling aggregate in the formed perforations to form conical transverse piles, and opening a freezing pile foundation to form a fixed layer on the periphery of the area to be tamped;
thirdly, tamping by using a special-shaped porous tamping hammer for 4-5 times of one cycle, and performing three cycles, wherein the tamping force of the first cycle is 2000kN · m-2400 kN · m, the tamping force of the second cycle is 1500kN · m-2000 k N · m, and the tamping force of the third cycle is 2000kN · m-2400 k N · m;
step four, after water in the perforating well is drained to the open channel, covering a sealing cover on the perforating well mouth, vacuumizing for 24 hours, and then draining;
and fifthly, backfilling the aggregate to the perforating well, and adopting a common rammer to perform dynamic compaction on the soft soil foundation.
Preferably, the distance between adjacent freezing pile foundations is 5-8 m, and the distance between the freezing pile foundations and the edge of the open channel is 2 m.
Preferably, the density of the perforation wells is three per 100 square meters, and the distance between two adjacent perforation wells is not less than 4 m.
Preferably, the aggregate is broken stone or coarse sand, and the diameter of the aggregate is 2-3 cm.
Preferably, the perforations punched by the dynamic compaction perforation construction device for the soft soil foundation are staggered up and down, and the distance between the upper and lower adjacent perforations is more than 1.5 m.
The invention at least comprises the following beneficial effects:
firstly, an open channel is dug near a to-be-tamped area, a freezing rod is inserted into the area close to the to-be-tamped area for refrigeration, a fixed layer is formed, soft soil to be tamped is surrounded, the deformation performance of the soil in the surrounded area is low, and the force transmission efficiency in the dynamic compaction process is improved;
secondly, the perforation is arranged, and the solid filler is filled into the perforation, so that an artificial guide pipe with certain flow conductivity can be formed, the squeezing and water discharging operation in the dynamic compaction is greatly facilitated, meanwhile, the guide pipe is not easy to block, and the effect similar to squeezing water out by an extruder is achieved under the action of a rammer, so that the water discharging is more sufficient, the subsequent compaction is facilitated, and rubber soil is not easy to appear;
thirdly, perforating holes are arranged, the perforating holes are vertically and uniformly spaced, the perforating holes are in a multi-stage radial shape by taking a perforating well as a center, aggregate filled in the perforating holes can be used for replacing and filling a soft soil part, meanwhile, the gravity generated by the special-shaped rammer can be effectively transmitted to the ground bottom, and the transmission of the force is deeper;
the fourth, set up soft soil foundation dynamic compaction perforation construction device and can splice according to the construction demand of reality for perforation efficiency is higher, can in time fill the aggregate after having penetrated the hole simultaneously, prevents that the perforation from being sealed again because of the mobility of soft soil and leading to the efficiency of construction low, and then influences the dynamic compaction effect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a dynamic compaction perforation construction device for a soft soil foundation according to one technical scheme of the invention;
FIG. 2 is a schematic structural diagram of the special-shaped rammer according to one technical scheme of the invention;
fig. 3 is a schematic cross-sectional view at a position a of the dynamic compaction perforation construction device for the soft soil foundation according to one technical scheme of the invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1 to 3, the present invention provides a dynamic compaction perforation construction device for soft soil foundation, comprising:
the upper shell 2 is of a cylindrical structure, the upper part of the upper shell 2 is connected with an upper connector, and the upper connector is connected with a lifting hook of a lifting vehicle and used for lifting the dynamic compaction perforation construction device for the soft soil foundation; the inner part of the upper shell 2 is hollow, an igniter assembly is arranged and mainly used for igniting detonating ammunition, an insulating layer 1 is arranged at the lower part of the igniter assembly, and a main igniter string connector is embedded in the lower bottom surface of the upper shell 2; the main igniter string connector and the igniter assembly penetrate through the insulating layer 1 through an electric connecting wire to realize electric connection; the lower edge of the upper shell 2 is in an inverted ladder shape, a plurality of screw holes are uniformly arranged at intervals in the circumferential direction on the outer edge of the ladder-shaped structure at the bottommost part, and the axes of the screw holes are horizontal;
at least more than one perforating unit 4 which can be spliced in a tail end manner, wherein the perforating unit 4 is of a cylindrical structure; the upper top surface of each perforating unit 4 is inwards sunken to form a splicing groove, the splicing groove is matched with the lower part of the upper shell 2, so that the bottommost stepped structure can be inserted into the splicing groove, the side wall of the splicing groove is provided with a through hole, the through hole corresponds to a screw hole on the upper shell 2, and the perforating units 4 can be detachably connected with the lower part of the upper shell 2 through screws 3; an auxiliary igniter string connector 5 is embedded in the bottom surface of the splicing groove and is electrically connected with the main igniter string connector;
a bone trough 6 and a cartridge trough 7 are arranged in the perforation unit 4, the bone trough 6 is vertically arranged, and the cartridge trough 7 is obliquely arranged; the bone trough 6 is positioned at the upper part of the ammunition trough 7, the lower bottom surface of the bone trough 6 is communicated with the ammunition trough 7, a discharge valve 8 is arranged at the communicated part, the discharge valve 8 is movably arranged, when ammunition is not filled in the ammunition trough 7, the discharge valve 8 is in an open state, when ammunition is filled, the discharge valve 8 is closed, and the depth of the aggregate trough 6 is 1.3-1.5 m; the upper top surface of the aggregate groove 6 is communicated with the lower bottom surface of the splicing groove and is used for feeding materials into the aggregate groove 6; the inclined angle of the ammunition groove 7 is 3-5 degrees compared with the horizontal plane, the inclined angle is determined according to the type of aggregates, the inclined angle of fine aggregates is small, the inclined angle of large-particle aggregates is large, one end of the ammunition groove 7, which is close to the central shaft of the perforating unit 4, is high, ammunitions are filled in the ammunition groove 7, the tail part of the ammunition groove 7 is connected with a sub-igniter, and the sub-igniter is electrically connected with the sub-igniter string connector 5 and used for igniting the ammunitions; at least one charge groove 7 of each perforating unit 4 is arranged, and the charge grooves 7 of two vertically adjacent perforating units 4 can be aligned or not aligned; the number of the perforation units 4 and the splicing mode are adjusted according to construction requirements;
the lower bottom surface of the perforation unit 4 is the same as the lower bottom surface of the upper shell 2, and a main igniter string connecting head is embedded in the perforation unit; the lower part of the perforation unit 4 is in an inverted step shape, and a plurality of screw holes are uniformly arranged at intervals along the circumferential direction of the outer edge of the step shape;
the lower shell 9 is of an inverted circular truncated cone-shaped structure and is inwards sunken to form a splicing groove, the splicing groove is matched with the lower portion of the upper shell 2, a through hole is formed in the side wall of the splicing groove, the through hole corresponds to a screw hole in the perforating unit 4, and therefore the perforating unit 4 is detachably connected with the upper portion of the lower shell 9 through a screw 3.
When the device is used, ammunition and aggregate are filled firstly, and then the structures are spliced after the ammunition and the aggregate are filled.
The invention is further described with reference to specific examples.
Example 1
The soft soil foundation dynamic compaction construction method of the soft soil foundation dynamic compaction perforation construction device provided by the embodiment of the invention comprises the following steps:
step one, determining a region to be tamped according to a construction drawing, marking lines with marking powder, and excavating open channels along side lines on the periphery of the region to be tamped; the depth of the open channel is 0.5-1.0 m, and the open channel is used for guiding drainage in a soft soil foundation; embedding a freezing pile foundation in a position close to the open channel in the area to be compacted, wherein the freezing pile foundation is equipment similar to vertical pipe refrigeration, and refrigeration is realized through a liquid-gas refrigerant or liquid nitrogen is adopted for refrigeration; the spacing distance between adjacent freezing pile foundations is 8m, and the distance between the freezing pile foundations and the edge of the open channel is 2 m; open channels are dug near the area to be tamped, and freezing rods are inserted into the area to be tamped for refrigeration to form a fixed layer, so that soft soil to be tamped is surrounded, the deformation performance of the soil in the surrounded area is low, and the force transmission efficiency in the dynamic compaction process is improved;
secondly, perforating a perforated well in the area to be tamped, perforating in the perforated well by using a soft soil foundation dynamic compaction perforation construction device, filling aggregate in the formed perforations, wherein the aggregate is broken stone with large grain diameter, the diameter of the broken stone is about 2-3 cm, a conical transverse pile is formed, and a freezing pile foundation is opened to form frozen soil fixation on the periphery of the area to be tamped;
the perforation is arranged, and the solid filler is filled into the perforation, so that an artificial conduit with certain flow conductivity can be formed, the extrusion drainage operation in dynamic compaction is greatly facilitated, meanwhile, the conduit is not easy to block, the effect similar to the extrusion water of an extruder is achieved under the action of a rammer, the drainage is more sufficient, the subsequent compaction is facilitated, and rubber soil is not easy to appear;
the perforation holes are uniformly arranged at vertical intervals and are in a multistage radial shape by taking the perforation hole as a center, the filling aggregate in the perforation holes can play a role in replacing and filling the soft soil part, and meanwhile, the gravity generated by the special-shaped rammer can be effectively transmitted to the ground bottom, so that the force is transmitted more deeply;
thirdly, tamping by using the special-shaped porous rammer 10 for 4-5 times of one cycle, and performing three cycles, wherein the tamping force of the first cycle is 2000kN · m-2400 kN · m, the tamping force of the second cycle is 1500kN · m-2000 kN · m, and the tamping force of the third cycle is 2000kN · m-2400 k N · m; through three periods of repeated ramming, the soft soil in the soft soil foundation is tamped, and the effluent water flows into a perforation well along a transverse pile formed in a perforation and is collected; compared with a common rammer, the ramming coverage of the special-shaped empty rammer is narrow, the special-shaped empty rammer can perform heavy ramming on a small-range area, other areas are not affected, and rubber soil is prevented from being formed in different ramming degrees of partial areas;
step four, after the water in the perforation well is drained to the open channel, a sealing cover covers the well mouth of the perforation well, and the operation of covering the sealing cover specifically comprises the following steps: digging a fixed groove at the edge of a well mouth, filling a small amount of water at the bottom of the fixed groove to enable the soft soil to be sludge-shaped, covering a sealing film with an air suction opening on the well mouth of the perforating well, filling the fixed groove with the soft soil when the edge exceeds the fixed groove, connecting a vacuum machine with the air suction opening, vacuumizing for 24 hours, and then draining;
and fifthly, backfilling the aggregate to the perforating well, and performing dynamic compaction on the foundation of the perforating well by adopting a common flat bottom rammer.
Adopt this technical scheme, the soft soil foundation consolidation degree that the dynamic compaction obtained is more than 83%, sets up the construction demand that the dynamic compaction perforation construction equipment of soft soil foundation can splice according to the reality for perforation efficiency is higher, can in time fill the aggregate after having penetrated the hole simultaneously, prevents that the perforation from being sealed again because of the mobility of soft soil and leading to the efficiency of construction low, and then influences the dynamic compaction effect.
Example 2
The soft soil foundation dynamic compaction construction method of the soft soil foundation dynamic compaction perforation construction device provided by the embodiment of the invention comprises the following steps:
determining a region to be tamped according to a construction drawing, and excavating open channels along side lines on the periphery of the region to be tamped; burying freezing pile foundations in the region to be compacted and close to the open channel, wherein the spacing distance between every two adjacent freezing pile foundations is 5m, and the distance between the freezing pile foundations and the edge of the open channel is 2 m;
secondly, perforating a perforated well in the area to be tamped, perforating in the perforated well by using a soft soil foundation dynamic compaction perforation construction device, filling aggregate in the formed perforations, wherein the aggregate is broken stone with large grain diameter, the diameter of the broken stone is about 2-3 cm, a conical transverse pile is formed, and a freezing pile foundation is opened to form frozen soil fixation on the periphery of the area to be tamped; the density of the perforation wells is three per 100 square meters, and the distance between every two adjacent perforation wells is not less than 4 m;
the perforation is arranged, and the solid filler is filled into the perforation, so that an artificial conduit with certain flow conductivity can be formed, the extrusion drainage operation in dynamic compaction is greatly facilitated, meanwhile, the conduit is not easy to block, the effect similar to the extrusion water of an extruder is achieved under the action of a rammer, the drainage is more sufficient, the subsequent compaction is facilitated, and rubber soil is not easy to appear;
the perforation holes are uniformly arranged at vertical intervals and are in a multistage radial shape by taking the perforation hole as a center, the filling aggregate in the perforation holes can play a role in replacing and filling the soft soil part, and meanwhile, the gravity generated by the special-shaped rammer can be effectively transmitted to the ground bottom, so that the force is transmitted more deeply;
thirdly, tamping by using the special-shaped porous rammer 10 for 4-5 times of one cycle, and performing three cycles, wherein the tamping force of the first cycle is 2000kN · m-2400 kN · m, the tamping force of the second cycle is 1500kN · m-2000 kN · m, and the tamping force of the third cycle is 2000kN · m-2400 k N · m;
step four, after the water in the perforation well is drained to the open channel, a sealing cover covers the well mouth of the perforation well, and the operation of covering the sealing cover specifically comprises the following steps: digging a fixed groove at the edge of a well mouth, filling a small amount of water at the bottom of the fixed groove to enable the soft soil to be sludge-shaped, covering a sealing film with an air suction opening on the well mouth of the perforating well, filling the fixed groove with the soft soil when the edge exceeds the fixed groove, connecting a vacuum machine with the air suction opening, vacuumizing for 24 hours, and then draining;
and fifthly, backfilling the aggregate to the perforating well, and adopting a common rammer to perform dynamic compaction on the soft soil foundation.
Example 3
The soft soil foundation dynamic compaction construction method of the soft soil foundation dynamic compaction perforation construction device provided by the embodiment of the invention comprises the following steps:
determining a region to be tamped according to a construction drawing, and excavating open channels along side lines on the periphery of the region to be tamped; burying a frozen pile foundation in a position close to the open channel in the area to be compacted;
secondly, perforating a perforated well in the area to be tamped, perforating in the perforated well by using a soft soil foundation dynamic compaction perforation construction device, filling aggregate into the formed perforations, wherein the aggregate is broken stone or coarse sand, the diameter of the aggregate is about 2-3 cm, a conical transverse pile is formed, and a freezing pile foundation is opened to form a fixed layer on the periphery of the area to be tamped; perforations punched by the dynamic compaction perforation construction device for the soft soil foundation are staggered up and down, and the distance between the upper adjacent perforation and the lower adjacent perforation is more than 1.5 m; the perforations with different heights are staggered, so that the coverage area of the transverse piles is wider, namely the relative fixed connection degree of the soft soil foundation is higher, the force transmission is more efficient, the transverse piles can penetrate into deeper stratums, and the ramming drainage effect is improved;
thirdly, tamping by using the special-shaped porous rammer 10 for 4-5 times of one cycle, and performing three cycles, wherein the tamping force of the first cycle is 2000kN · m-2400 kN · m, the tamping force of the second cycle is 1500kN · m-2000 kN · m, and the tamping force of the third cycle is 2000kN · m-2400 k N · m;
step four, after the water in the perforation well is drained to the open channel, a sealing cover covers the well mouth of the perforation well, and the operation of covering the sealing cover specifically comprises the following steps: digging a fixed groove at the edge of a well mouth, filling a small amount of water at the bottom of the fixed groove to enable the soft soil to be sludge-shaped, covering a sealing film with an air suction opening on the well mouth of the perforating well, filling the fixed groove with the soft soil when the edge exceeds the fixed groove, connecting a vacuum machine with the air suction opening, vacuumizing for 24 hours, and then draining;
and fifthly, backfilling the aggregate to the perforating well, and adopting a common rammer to perform dynamic compaction on the soft soil foundation.
In conclusion, the open channel is dug near the area to be tamped, and the freezing rod is inserted into the area to be tamped for refrigeration to form the fixed layer, so that the soft soil to be tamped is surrounded, the deformation performance of the soil in the surrounded area is low, and the transmission efficiency of the force in the dynamic compaction process is improved; the perforation is arranged, and the solid filler is filled into the perforation, so that an artificial conduit with certain flow conductivity can be formed, the extrusion drainage operation in dynamic compaction is greatly facilitated, meanwhile, the conduit is not easy to block, the effect similar to the extrusion water of an extruder is achieved under the action of a rammer, the drainage is more sufficient, the subsequent compaction is facilitated, and rubber soil is not easy to appear; the perforation holes are uniformly arranged at vertical intervals and are in a multistage radial shape by taking the perforation hole as a center, the filling aggregate in the perforation holes can play a role in replacing and filling the soft soil part, and meanwhile, the gravity generated by the special-shaped rammer can be effectively transmitted to the ground bottom, so that the force is transmitted more deeply; set up soft soil foundation dynamic compaction perforation construction device and can splice according to the construction demand of reality for perforation efficiency is higher, can in time fill the aggregate after having penetrated the hole simultaneously, prevents that the perforation from being sealed again because of the mobility of soft soil and leading to the efficiency of construction low, and then influences the dynamic compaction effect.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. Soft soil foundation dynamic compaction perforation construction equipment, its characterized in that includes:
the upper part of the upper shell is connected with an upper connector for hoisting, the upper shell is hollow and is provided with an igniter assembly, the lower part of the igniter assembly is provided with an insulating layer, and the lower bottom surface of the upper shell is embedded with a main igniter string connector; the main igniter string connector is electrically connected with the igniter assembly; the lower edge of the upper shell is in an inverted step shape, and a plurality of screw holes are uniformly arranged at intervals in the circumferential direction on the outer edge of the step-shaped structure at the bottommost part;
the top surface of the perforation unit is inwards sunken to form a splicing groove, the splicing groove is matched with the lower part of the upper shell, a through perforation is arranged on the side wall of the splicing groove, the perforation corresponds to a screw hole in the upper shell, and the perforation unit is detachably connected with the lower part of the upper shell through a screw; an auxiliary igniter string connector is embedded in the bottom surface of the splicing groove and is electrically connected with the main igniter string connector; a bone material groove and an ammunition groove are arranged in the perforation unit, the bone material groove is vertically arranged, and the ammunition groove is obliquely arranged; the bone material groove is positioned at the upper part of the ammunition groove, the lower bottom surface of the bone material groove is communicated with the ammunition groove, and a discharge valve is arranged at the communicated part; the upper top surface of the bone material groove is communicated with the lower bottom surface of the splicing groove; the inclination angle of the ammunition groove is 3-5 degrees, one end of the ammunition groove, which is close to the central shaft of the perforation unit, is high, ammunitions are filled in the ammunition groove, the tail part of the ammunition groove is connected with a sub-igniter, and the sub-igniter is electrically connected with the serial connecting head of the sub-igniter; at least one perforation unit is arranged and spliced according to construction requirements; the lower bottom surface of the perforation unit is the same as the lower bottom surface of the upper shell, and a main igniter string connecting head is embedded in the perforation unit; the lower part of the perforation unit is in an inverted step shape, and a plurality of screw holes are uniformly arranged at intervals along the circumferential direction of the outer edge of the step shape;
the lower shell is of an inverted circular truncated cone-shaped structure and is inwards sunken to form a splicing groove, the splicing groove is matched with the lower portion of the upper shell, a through hole is formed in the side wall of the splicing groove, the through hole corresponds to a screw hole in the perforating unit, and the perforating unit is detachably connected with the upper portion of the lower shell through a screw.
2. The soft soil foundation dynamic compaction construction method adopting the soft soil foundation dynamic compaction perforation construction device of claim 1, characterized by comprising the following steps:
determining a region to be tamped according to a construction drawing, and excavating open channels along side lines on the periphery of the region to be tamped; embedding a freezing pile foundation in a position close to the open channel in the area to be compacted, wherein the freezing pile foundation is vertical pipe refrigeration equipment, and refrigeration is realized through a liquid-gas refrigerant or liquid nitrogen is adopted for refrigeration;
secondly, perforating a perforated well in the area to be tamped, perforating in the perforated well by using a soft soil foundation dynamic compaction perforation construction device, filling aggregate in the formed perforations to form conical transverse piles, and opening a freezing pile foundation to form a fixed layer on the periphery of the area to be tamped;
thirdly, tamping by using a special-shaped porous tamping hammer for 4-5 times of one cycle, and performing three cycles, wherein the tamping force of the first cycle is 1800kN · m-2000 kN · m, the tamping force of the second cycle is 1200kN · m-1800 k N · m, and the tamping force of the third cycle is 1800kN · m-2000 k N · m;
step four, after water in the perforating well is drained to the open channel, covering a sealing cover on the perforating well mouth, vacuumizing for 24 hours, and then draining;
and fifthly, backfilling the aggregate to the perforating well, and adopting a common rammer to perform dynamic compaction on the soft soil foundation.
3. A dynamic compaction construction method for a soft soil foundation according to claim 2, wherein the spacing distance between adjacent frozen pile foundations is 5-8 m, and the distance between the frozen pile foundations and the edge of the open channel is 2 m.
4. A dynamic compaction construction method for soft soil foundations according to claim 2, wherein the density of the perforation wells is three per 100 square meters, and the distance between two adjacent perforation wells is not less than 4 m.
5. A dynamic compaction construction method for soft soil foundations as claimed in claim 2, wherein the aggregate is crushed stone or coarse sand, and the diameter of the aggregate is 2-3 cm.
6. A soft soil foundation dynamic compaction construction method according to claim 2, wherein the perforations punched by the soft soil foundation dynamic compaction perforation construction device are staggered up and down, and the distance between two adjacent perforations is more than 1.5 m.
Priority Applications (1)
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| CN109183778A (en) * | 2018-09-17 | 2019-01-11 | 佛山市森昂生物科技有限公司 | A method of utilizing coarse grain coral reef reinforcing liquefied foundation |
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| CN2896050Y (en) * | 2005-07-07 | 2007-05-02 | 汪祥卫 | Multiflame lighter |
| CN101445720A (en) * | 2008-12-30 | 2009-06-03 | 清华大学 | Preparation method of sialite binding material for well-cementing in oil-gas field |
| CN102022101A (en) * | 2010-11-26 | 2011-04-20 | 大庆钻探工程公司测井公司 | Multi-stage perforating pressurizing device |
| CN205297497U (en) * | 2015-12-22 | 2016-06-08 | 西安物华巨能爆破器材有限责任公司 | It explodes device to be used for ultra -temperature, superhigh pressure oil gas well perforation to pass with time delay |
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