CN112127345A - Soft soil foundation treatment device and foundation treatment construction method - Google Patents
Soft soil foundation treatment device and foundation treatment construction method Download PDFInfo
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- CN112127345A CN112127345A CN202010996927.0A CN202010996927A CN112127345A CN 112127345 A CN112127345 A CN 112127345A CN 202010996927 A CN202010996927 A CN 202010996927A CN 112127345 A CN112127345 A CN 112127345A
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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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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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
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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Abstract
The invention provides a soft soil foundation treatment device, and belongs to the technical field of foundation treatment. The technical scheme is as follows: a soft soil foundation treatment device comprises a pile shoe, wherein a pile pipe is arranged on the pile shoe and sinks to the underground along with the pile shoe; a sleeve is arranged in the pile pipe, a water filtering hole is formed in the pipe wall of the lower end of the sleeve, and the upper end of the sleeve is connected with a water pumping device through a water drainage pipe; the upper end of the grouting pipe is connected with a grouting system, and the other end of the grouting pipe penetrates into the sleeve; forming a pile foundation hole through the pile shoe and the pile pipe, filling a sand well between the sleeve and the pile pipe, performing composite pile foundation drainage consolidation by utilizing a water filtering hole at the lower end of the sleeve and a water suction pump, then inserting a grouting pipe, extracting the sleeve, performing grouting, and forming a composite pile foundation. The invention has the beneficial effects that: the invention combines two soft soil foundation treatment modes of drainage consolidation treatment and composite pile foundation treatment, so that the soft soil foundation treatment is economic and efficient, and the foundation treatment quality is improved.
Description
Technical Field
The invention relates to the field of foundation treatment, in particular to a soft soil foundation treatment device.
Background
At present, the soft soil foundation is treated by adopting a drainage consolidation method or a composite pile foundation. The drainage consolidation is mainly carried out by adopting treatment methods such as a plastic drainage belt, a bagged sand well and the like, and the composite pile foundation is mainly carried out by adopting treatment modes such as a high-pressure jet grouting pile, a stirring pile and the like; in the prior art, a treatment mode of grouting by using a geotextile bag or a vacuum bag is adopted, but more than one treatment method is usually selected on site, for example, the drainage consolidation treatment of a soft soil foundation is independently adopted, the construction period is long, the treatment effect is difficult to ensure, a sand well and a plastic drainage belt cannot be fully utilized, and resources are wasted; the composite pile foundation is independently adopted, the bearing capacity of undisturbed soft soil is low, the bearing capacity of a soft soil stratum is exerted to a limited extent, the requirement on the bearing capacity of the pile is high, and meanwhile, a thick mattress layer is needed for adjusting the stress ratio of the pile soil, so that the economy is poor; the geotextile bag grouting mode has no drainage consolidation process, so that the engineering efficiency is lower; the vacuum bag is treated with grouting slurry of pure cement or other mixed slurry, and the composite pile foundation has poor strength.
In conclusion, the existing soft soil foundation treatment method has long construction period, difficult guarantee of treatment effect and poor economical efficiency.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a soft soil foundation treatment device and a foundation treatment construction method, the invention combines the advantages of drainage consolidation, composite piles and bag expansion, optimizes the construction process, adopts sand well sand filling, avoids the problems of complicated sand filling, long-term instability of sand well through stratum and the like when the bagged sand well treats a soft soil stratum, simultaneously fully utilizes the advantages of large water seepage section and good drainage effect of the sand well, accelerates the foundation treatment speed, fully utilizes the sand of the sand well, greatly improves the pile forming quality after grouting, has much higher strength than the composite pile foundation of pure slurry, can fully exert the coordination of pile soil bearing capacity, and effectively improves the foundation bearing capacity; due to the existence of the composite piles, the time for drainage consolidation can be reduced according to requirements, and the construction efficiency is improved; according to the effect of drainage consolidation, orderly grouting in batches to form piles, so that uneven settlement can be effectively controlled; meanwhile, because the sand well has a small caliber, the adopted construction machinery and construction method are simple and economical.
The invention is realized by the following technical scheme: a soft soil foundation treatment device comprises a pile shoe, wherein a positioning ring is arranged on the upper end surface of the pile shoe, the outer diameter of the positioning ring is smaller than that of a cylinder, and a positioning column is arranged on the pile shoe and positioned in the center of the positioning ring; a pile pipe is arranged on the outer side of the positioning ring, and the bottom of the pile pipe abuts against the pile shoe;
a sleeve is arranged on the outer side of the positioning column, a plurality of water filtering holes are formed in the pipe wall of the lower end of the sleeve, and the upper end of the sleeve is connected with a water pumping device through a water drainage pipe;
the outer diameter of the grouting pipe is smaller than the inner diameter of the sleeve, the upper end of the grouting pipe is connected with a grouting system, and the other end of the grouting pipe penetrates into the sleeve and abuts against the positioning column;
the upper ends of the pile pipe, the sleeve pipe and the grouting pipe extend out of the ground, and the extending end of the grouting pipe is higher than the sleeve pipe.
The pile shoe and the pile pipe are sunk to form a pile hole, the pile pipe is pulled out, sand is filled between the sleeve and the pile pipe to form a sand well, the upper end of the sleeve is connected with a water pumping device, water in the stratum permeates into the water filtering hole and is pumped out, drainage consolidation is carried out on the stratum, the grouting pipe is inserted after the drainage consolidation process is completed, the sleeve is pulled out, and slurry after grouting and the sand well form a composite pile foundation.
In order to facilitate construction, the pile pipe is formed by connecting a plurality of sections of steel pipes through threads; the sleeve is formed by connecting a plurality of sections of steel pipe II through threads, and water filtering holes which are not larger than 1.5mm are uniformly distributed in the outer wall of the section of steel pipe II at the bottommost layer of the sleeve.
Furthermore, a plurality of grouting small holes with the inner diameter not smaller than 3mm are evenly distributed in the circumferential direction in the middle of the pipe wall of the grouting pipe, a grouting bag is sleeved on the grouting pipe and at a position corresponding to the grouting small holes, and the grouting bag is communicated with the grouting pipe through the grouting small holes.
The grout injected into the grouting bag can expand to extrude the sand well, an expanded body is formed on the composite pile foundation, the stress condition of the composite pile foundation can be improved, and the stability and the strength of the composite pile foundation are improved.
Considering that the grouting bag is arranged on the grouting pipe and cannot influence the drawing-out of the grouting pipe, furthermore, a supporting pipe is sleeved on the grouting pipe and at a position corresponding to the grouting small hole, elastic sheets protruding inwards are arranged at two ends of the supporting pipe, a groove is arranged on the pipe wall of the grouting pipe and at a position corresponding to the elastic sheets, and the elastic sheets are clamped into the groove; a through hole corresponding to the small grouting hole is formed in the middle of the supporting tube, a rubber guide tube is arranged in the small grouting hole and the through hole, an outward flange is arranged at one end, arranged in the grouting tube, of the rubber guide tube, and the outward flange abuts against the inner wall of the grouting tube; the grouting bag is a rubber sleeve with an upper opening and a lower opening, and the upper end and the lower end of the rubber sleeve are sleeved at the two ends of the supporting tube through clamping rings. The elastic sheet is clamped into the groove to prevent the supporting tube from falling off or rotating; the length of one end of the rubber guide pipe extending out of the supporting pipe is about 2-3mm, and finally after the expansion body is formed, the supporting pipe and the grouting pipe are connected in a clamped mode through the elastic sheet, the elastic sheet is ejected out when the grouting pipe is pulled out, the supporting pipe cannot be taken out by the grouting pipe, meanwhile, the rubber guide pipe is taken out by the grouting pipe, and the grouting pipe can be pulled out smoothly.
Further, when a plurality of the expansion bodies need to be formed on the composite pile foundation, a plurality of groups of the grouting small holes are arranged on the grouting pipe at intervals and are respectively sleeved with the supporting pipe and the grouting bag.
However, when a large enlarged body needs to be formed on the composite pile foundation, the weight of the enlarged body increases along with the increase of the sizes of the grouting bag and the support tube, the support tube falls off due to the fact that clamping force of the spring pieces is possibly insufficient, therefore, in the construction process, a plurality of elastic claws are welded on the grouting tube and above the support tube, the lower ends of the elastic claws are clamped and arranged on the outer side of the grouting bag, the support tube is ensured not to fall off when the grouting tube is inserted, when the enlarged body is formed, the elastic claws are supported, and the grouting tube can be smoothly drawn out.
Furthermore, the supporting pipe is a steel pipe with the wall thickness smaller than 1 mm.
When the slip casting pipe pushes down, after the lower port is plugged, the slurry can be injected into the slip casting sack, and for better plugging the lower port of the slip casting pipe, further, a rubber plug is fixedly arranged at the center of the upper end of the positioning column, and the rubber plug is a cone and the cone point of the rubber plug is upward. When the grouting pipe is pressed downwards, the rubber plug can be embedded into the lower port of the grouting pipe.
Further, the pile shoe is prefabricated by concrete.
In consideration of the above, if the slip casting pipe is inserted into the pile shoe, if the slip casting pipe is eccentric, the lower port of the slip casting pipe cannot be completely blocked, so that the swelling degree of the slip casting bag is insufficient, and the position of the slip casting bag is eccentric, so that the surrounding sand well is stressed unevenly when the slip casting bag is swelled, thereby reducing the forming quality of the enlarged body. Further, a grouting pipe auxiliary device is arranged on the stratum and comprises a support, a bidirectional screw rod is rotatably arranged on the support, two ends of the bidirectional screw rod are provided with screw rod nuts through threaded connection, clamping plates are arranged on the inner sides of the screw rod nuts, a guide rod is arranged on the support, the clamping plates are sleeved on the guide rod, and V-shaped grooves are formed in the opposite surfaces of the two clamping plates;
the clamping plate is characterized in that an arc-shaped plate is arranged on the inner side of the clamping plate and is positioned right above the V-shaped groove through a spring, a screw rod is arranged on the clamping plate and corresponds to the arc-shaped plate through threaded connection, and the screw rod abuts against the arc-shaped plate.
The bidirectional screw rod is rotated to enable the V-shaped groove to be used for clamping the sleeve, and the screw rod is adjusted to adjust the distance between the arc-shaped plate and the grouting pipe; the grouting pipe auxiliary device can assist the grouting pipe to be inserted without eccentricity, and the clamping plate can also ensure the stability of the grouting pipe during grouting;
after the slip casting finishes, upwards take out from can be more strenuous during the slip casting pipe, it is further, just be located on the grip block the top of arc is provided with the fixed plate, the fixed plate is improved level and is equipped with the motor, be connected with the running roller in the drive shaft of motor, the running roller sets up the both sides of slip casting pipe and with the guide bar is parallel. The running roller supports the outer wall of slip casting pipe, and the rotational speed of two motor shafts is the same, and direction of rotation is opposite, the running roller can drive slip casting pipe upward movement not only can improve the efficiency that the slip casting pipe was taken out from can also make to take out from the process more stable.
A construction method for treating a foundation by using the soft soil foundation treatment device comprises the following steps:
step 1: laying a mattress layer on the stratum, determining a pile position on the mattress layer, and then placing the pile shoe on the pile position to prepare for sinking;
step 2: the lower end of the second steel pipe with the water filtering hole is clamped on the positioning column;
and step 3: clamping a section of steel pipe I on the positioning ring;
and 4, step 4: sinking a section of steel pipe I and the pile shoe together, and leaving 300mm to expose the mattress layer so as to facilitate the continuous installation of the next section;
and 5: and continuously connecting the first steel pipe and the second steel pipe through threads, and continuously sinking, and leaving 300mm to expose the mattress layer.
Step 6: according to the method in the step 5, continuously installing the first steel pipe and the second steel pipe until the first steel pipe and the second steel pipe reach the designed elevation;
and 7: pouring prepared sand into a gap between the pile pipe and the sleeve, and pulling out the pile pipe while pouring the sand so that the space between the sleeve and the stratum is filled with the sand until the pile pipe is pulled out and the sand is poured to the bottom of the mattress layer to form a sand well;
and 8: repeating the steps 2-7 according to the pile position determined in the step 1 to complete the construction of all pile holes;
and step 9: connecting the sleeve with a water pumping device through a water drainage pipe, pumping underground water out to enable the stratum to be subjected to drainage consolidation, stopping pumping water and separating the sleeve from the water drainage pipe until the stratum consolidation meets design requirements;
step 10: and sleeving the support pipe on the grouting pipe, clamping the elastic sheet in the groove, penetrating one end of the rubber conduit with a flange into the through hole and the small grouting hole, and fixing the upper end and the lower end of the rubber sleeve on the upper end and the lower end of the support pipe by using snap rings.
Step 11: penetrating the grouting pipe into the sleeve, installing the grouting pipe auxiliary device after the grouting bag enters the sleeve, rotating a bidirectional screw rod to adjust the clamping plate, so that a V-shaped groove clamps the sleeve, adjusting the screw rod, so that a wire gap is reserved between the arc-shaped plate and the grouting pipe, assisting the grouting pipe to vertically penetrate the sleeve in the middle, and enabling the conical tip of the rubber plug to be embedded into the bottom end of the grouting pipe;
step 12: rotating the two-way screw rod, loosening the clamping plate, extracting the sleeve in sections, retaining a section of the second steel pipe on the mattress layer, adjusting the clamping plate again to enable the second steel pipe to be clamped and fixed by the V-shaped groove, and adjusting the screw rod to enable a wire gap to be reserved between the arc-shaped plate and the grouting pipe;
step 13: connecting the grouting pipe with a grouting system, slightly lifting the grouting pipe to enable a gap to be formed between the lower end of the grouting pipe and the rubber plug, adjusting the screw rod at the moment, enabling the arc-shaped plate to clamp and fix the grouting pipe, starting grouting, and enabling the grout to continuously flow out through the lower end of the grouting pipe and penetrate the sand well to form a composite pile foundation until the grout reaches the bottom of the mattress layer and stops grouting;
step 14: slightly adjusting the screw rod to enable a wire gap to be reserved between the arc-shaped plate and the grouting pipe, pressing down the grouting pipe, inserting the rubber plug into the lower end of the grouting pipe for plugging, continuing grouting, filling grout into the grouting bag along the grouting small hole, enabling the grouting bag to expand and extrude the sand well, and forming an expanded body of the composite pile foundation at a corresponding position;
step 15: dismantling the grouting system, starting the motor to drive the roller to rotate, assisting in pulling out the grouting pipe, and cleaning the grouting system and the grouting pipe;
step 16: and (5) repeating the steps 9-15 to complete the construction of all the composite pile foundations, and finally finishing the foundation treatment after all the composite pile foundations are molded to the designed strength.
The invention has the beneficial effects that: the invention combines two soft soil foundation treatment modes of drainage consolidation treatment and composite pile foundation treatment, so that the soft soil foundation treatment is economic and efficient, and the foundation treatment quality is improved; the composite pile foundation has a relatively small diameter, the existing mature equipment can be adopted, the construction method is simple after optimization, the whole scheme is economical and efficient, the composite pile foundation can be recycled, and the cost is saved; the method is different from the form of treating the soft soil foundation by drainage consolidation of the traditional bagged sand well and the like, grouting treatment is carried out on the pile holes, and underground water in the stratum penetrated by the pile holes can be effectively isolated, so that the stratum drainage consolidation treatment effect is stable; the sand of the sand well is used as the main material of the composite pile foundation, so that the cost is saved, and the pile forming quality after grouting is greatly improved and is much stronger than the composite pile foundation of pure cement slurry; by using the grouting bag, the middle part of the composite pile foundation forms an expansion section, so that the stress state of the composite pile foundation can be improved, the coordination of the bearing capacity of pile soil can be fully exerted, the bearing capacity of the foundation can be effectively improved, and the length of the composite pile foundation can be effectively reduced; due to the existence of the composite piles, the time for drainage consolidation can be reduced according to requirements, and the construction efficiency is improved; according to the effect of drainage consolidation, orderly grouting in batches to form the pile, and the uneven settlement can be effectively controlled.
Drawings
FIG. 1 is a schematic view of the structure of the inserted pile tube and casing according to the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
FIG. 3 is a schematic view of a slip casting pipe structure according to the present invention.
Fig. 4 is a schematic view of the structure B-B of fig. 3.
Fig. 5 is an enlarged schematic view of a portion C in fig. 4.
Fig. 6 is a schematic diagram of a grouting bag structure.
Fig. 7 is a schematic view of the support tube structure.
FIG. 8 is a schematic view of the auxiliary device of the grouting pipe.
Fig. 9 is a schematic view of a pile shoe structure.
Fig. 10 is a schematic structural diagram of a composite pile foundation.
Wherein the reference numerals are: 1. a pile shoe; 101. a positioning ring; 102. a positioning column; 103. a rubber plug; 2. pile pipes; 3. a sleeve; 301. water filtering holes; 4. a grouting pipe; 401. a rubber conduit; 5. grouting a capsular bag; 501. supporting a tube; 502. a through hole; 503. a snap ring; 504. an elastic sheet; 6. a grouting pipe auxiliary device; 601. a support; 602. a bidirectional screw rod; 603. a lead screw nut; 604. a clamping plate; 605. a V-shaped groove; 606. an arc-shaped plate; 607. a screw; 608. a spring; 609. a guide bar; 610. a fixing plate; 611. a roller; 612. a motor; 7. a mattress layer; 8. an earth formation; 9. a sand well; 10. a composite pile foundation; 1001. an enlarged body.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
Referring to fig. 1-2, a soft soil foundation treatment device comprises a pile shoe 1, wherein the upper end surface of the pile shoe 1 is provided with a positioning ring 101, the outer diameter of the positioning ring 101 is smaller than that of a cylinder, and a positioning column 102 is arranged on the pile shoe 1 and positioned in the center of the positioning ring 101; the outer side of the positioning ring 101 is provided with a pile pipe 2, and the bottom of the pile pipe 2 is abutted against the pile shoe 1; the main body of the pile shoe 1 is of a concrete prefabricated structure and is a cone with the diameter of about 110mm and the height of about 150mm, the diameter of the upper end of the pile shoe 1 is larger than the outer diameter of the pile pipe 2 and is used for plugging the bottom opening of the pile pipe 2 and reducing the soil body smearing effect when the pile pipe 2 is pulled out; the pile pipe 2 is used for forming a hole of the composite pile foundation 10;
a sleeve 3 is arranged on the outer side of the positioning column 102, a plurality of water filtering holes 301 are formed in the pipe wall of the lower end of the sleeve 3, and the upper end of the sleeve 3 is connected with a water pumping device through a water drainage pipe;
the outer diameter of the grouting pipe 4 is smaller than the inner diameter of the sleeve 3, the upper end of the grouting pipe 4 is connected with a grouting system, and the other end of the grouting pipe 4 penetrates through the sleeve 3 and abuts against the positioning column 102; the slip casting pipe 4 is a steel pipe having a wall thickness of 2mm and DN10 mm.
The ground layer 8 is covered with a mattress layer 7 paved by medium-coarse sand, the mattress layer 7 is made of medium-coarse sand, the thickness is 300mm, the upper ends of the pile pipe 2, the sleeve pipe 3 and the grouting pipe 4 extend out of the mattress layer 7, and the extending end of the grouting pipe 4 is higher than the sleeve pipe 3.
Considering that the construction is inconvenient when the pile pipe 2 and the sleeve 3 are long, the pile pipe 2 is formed by connecting a plurality of sections of steel pipes through threads; the sleeve 3 is formed by connecting a plurality of sections of second steel pipes through threads, and water filtering holes 301 which are not larger than 1.5mm are uniformly distributed in the outer wall of the section of second steel pipe at the bottommost layer of the sleeve 3. The first steel pipe adopts a steel pipe with the wall thickness of 3mm and DN90mm, and the second steel pipe adopts a steel pipe with the wall thickness of 2mm and DN30 mm. And filling mixed sand between the casing 3 and the pile pipe 2 to form a sand well 9, and pumping water in the stratum 8 out through a water pumping device after the water in the stratum 8 permeates into the casing 3 through the water filtering holes 301 to form a drainage consolidation process of the stratum 8.
As shown in fig. 3-4 and fig. 10, a plurality of grouting holes with an inner diameter not less than 3mm are evenly distributed in the circumferential direction in the middle of the pipe wall of the grouting pipe 4, a grouting bag 5 is sleeved on the grouting pipe 4 at a position corresponding to the grouting holes, and the grouting bag 5 is communicated with the grouting pipe 4 through the grouting holes. The grout can expand in the slip casting bag 5, and then extrudees sand well 9, forms the enlarged footing 1001 on composite pile foundation 10, can improve composite pile foundation 10's atress condition, improves composite pile foundation 10's stability and intensity.
As shown in fig. 5-6, considering that the grouting bag 5 is mounted on the grouting pipe 4 and cannot affect the pulling-out of the grouting pipe 4, a supporting pipe 501 is sleeved on the grouting pipe 4 at a position corresponding to the small grouting hole, two ends of the supporting pipe 501 are provided with inwardly protruding elastic pieces 504, a groove is provided on the pipe wall of the grouting pipe 4 at a position corresponding to the elastic pieces 504, and the elastic pieces 504 are clamped into the groove; if the elastic piece 504 affects the installation of the support tube 501 on the grouting pipe, the elastic piece 504 may be connected by welding after the support tube 501 is installed at a designated position of the grouting pipe; a through hole 502 corresponding to the small grouting hole is formed in the middle of the support tube 501, a rubber guide tube 401 is arranged in the small grouting hole and the through hole 502, and an outward flange is arranged at one end, arranged in the grouting tube 4, of the rubber guide tube 401 and abuts against the inner wall of the grouting tube 4; the grouting bag 5 is a rubber sleeve with an upper opening and a lower opening, and the upper end and the lower end of the rubber sleeve are sleeved at two ends of the supporting tube 501 through a snap ring 503. The elastic piece 504 is clamped in the groove to prevent the support tube 501 from falling off or rotating; the length of the end of the rubber guide pipe 401 extending out of the supporting pipe 501 is about 2-3mm, after the expanding body 1001 is finally formed, the supporting pipe 501 is clamped with the grouting pipe 4 through the elastic sheet, the elastic sheet 504 is ejected out when the grouting pipe is pulled out, the supporting pipe 501 cannot be taken out by the grouting pipe 4, meanwhile, the rubber guide pipe 401 is taken out by the grouting pipe 4, and the grouting pipe 4 can be smoothly pulled out. The support tube 501 is a steel tube having a wall thickness of less than 1 mm.
When a plurality of enlarged bodies 1001 are required to be formed on the composite pile foundation 10, a plurality of groups of grouting small holes are arranged on the grouting pipe 4 at intervals, and the supporting pipe 501 and the grouting bag 5 are respectively sleeved on the grouting small holes.
However, when a large expanding body 1001 needs to be formed on the composite pile foundation 10, at this time, along with the increase in size of the grouting bag 5 and the support pipe 501 and the increase in weight, the support pipe 501 may fall off due to insufficient clamping force of the spring pieces 504, so that in the construction process, a plurality of elastic claws are welded on the grouting pipe 4 and above the support pipe 501, the lower ends of the elastic claws are clamped and arranged outside the grouting bag 5, the support pipe 501 does not fall off when the grouting pipe 4 is inserted, when the expanding body 1001 is formed, the elastic claws are supported, and the grouting pipe 4 can be smoothly drawn out.
As shown in fig. 9, when the grouting pipe 4 is pressed down and the lower port is plugged, the grout is injected into the grouting bag 5, and in order to better plug the lower port of the grouting pipe 4, a rubber plug 103 is fixedly arranged at the center of the upper end of the positioning column 102, and the rubber plug 103 is a cone with an upward conical tip. When the grouting pipe 4 is pressed down, the rubber plug 103 can be inserted into the lower end of the grouting pipe 4.
As shown in fig. 8, if the slip casting pipe 4 is inserted into the pile shoe 1 eccentrically, the lower port of the slip casting pipe 4 cannot be completely blocked, and the expansion degree of the slip casting bladder 5 is insufficient, and the position of the slip casting bladder 5 is also eccentrically, so that the surrounding sand well 9 is unevenly stressed when the slip casting bladder 4 is expanded, and the molding quality of the enlarged body 1001 is deteriorated. The formation 8 is provided with a grouting pipe auxiliary device 6 which comprises a support 601, the support 601 is rotatably provided with a bidirectional screw 602, two ends of the bidirectional screw 602 are provided with screw nuts 603 through threaded connection, the inner side of the screw nut 603 is provided with a clamping plate 604, the support 601 is provided with a guide rod 609, the clamping plate 604 is sleeved on the guide rod 609, and the opposite surfaces of the two clamping plates 604 are provided with V-shaped grooves 605;
an arc-shaped plate 606 is arranged on the inner side of the clamping plate 604 and right above the V-shaped groove 605 through a spring 608, a screw 607 is arranged on the clamping plate 604 and corresponding to the arc-shaped plate 606 through threaded connection, and the screw 607 is pressed against the arc-shaped plate 606.
The V-shaped groove 605 can be used for clamping the sleeve 3 by rotating the bidirectional screw 602, and the adjusting screw 607 can adjust the distance between the arc plate 606 and the grouting pipe 4; the auxiliary device of the grouting pipe can assist the grouting pipe to be inserted without eccentricity, and the clamping plate can also ensure the stability of the grouting pipe during grouting;
after grouting is finished, the grouting pipe is pulled upwards to be separated from the grouting pipe, a fixing plate 610 is arranged on the clamping plate 604 and above the arc-shaped plate 606, a motor 612 is horizontally arranged on the fixing plate 610, a roller 611 is connected to a driving shaft of the motor 612, and the roller 611 is arranged on two sides of the grouting pipe 4 and is parallel to the guide rod 609. Running roller 611 supports the outer wall at the slip casting pipe, and the rotational speed of two motor shafts is the same, and direction of rotation is opposite, and running roller 611 can drive slip casting pipe 4 upward movement, not only can improve 4 pipe of slip casting and take out the efficiency of leaving, can also make to take out the process of leaving more stable.
A construction method for treating a foundation by using the soft soil foundation treatment device comprises the following steps:
step 1: laying a mattress layer 7 on the ground layer 8, determining a pile position on the mattress layer 7, and then placing the pile shoe 1 on the pile position to prepare for sinking;
step 2: the lower end of a second steel pipe with a water filtering hole 301 is clamped on the positioning column 102;
and step 3: clamping a section of steel pipe on the positioning ring 101;
and 4, step 4: sinking a section of steel pipe I together with the pile shoe 1, and leaving 300mm to expose the mattress layer 7, so as to facilitate the continuous installation of the next section;
and 5: and continuously connecting the first steel pipe and the second steel pipe through threads, and continuously sinking, and leaving 300mm to expose the mattress layer 7.
Step 6: according to the method in the step 5, continuously installing the first steel pipe and the second steel pipe until the first steel pipe and the second steel pipe reach the designed elevation;
and 7: pouring prepared sand into a gap between the pile pipe 2 and the casing pipe 3, and pulling out the pile pipe 2 while pouring the sand so that the space between the casing pipe 3 and the stratum 8 is filled with the sand until the pile pipe 2 is pulled out and the sand is poured to the bottom of the mattress layer 7 to form a sand well 9;
and 8: repeating the steps 2-7 according to the pile position determined in the step 1 to complete the construction of all pile holes;
and step 9: connecting the casing 3 with a water pumping device through a water drainage pipe, pumping underground water out to enable the stratum 8 to be subjected to drainage consolidation, stopping pumping water and separating the casing 3 from the water drainage pipe until the consolidation of the stratum 8 meets the design requirement;
step 10: the supporting tube 501 is sleeved on the grouting tube 4, so that the elastic sheet 504 is clamped in the groove, one end of the rubber conduit 401 with a flange penetrates through the through hole 502 and the grouting small hole, and the upper end and the lower end of the rubber sleeve are fixed on the upper end and the lower end of the supporting tube 501 by using the snap ring 503.
Step 11: penetrating a grouting pipe 4 into a sleeve 3, installing a grouting pipe auxiliary device 6 after a grouting bag 5 sinks into the sleeve 3, rotating a bidirectional screw 602 to adjust a clamping plate 604, so that a V-shaped groove 605 clamps the sleeve 3, adjusting a screw 607 to keep a wire gap between an arc plate 606 and the grouting pipe 4, and vertically penetrating the auxiliary grouting pipe 4 into the sleeve 3 in the middle so that a conical tip of a rubber plug 103 is embedded into the bottom end of the grouting pipe 4;
step 12: rotating the bidirectional screw 602, loosening the clamping plate 604, extracting the sleeve 3 in sections, keeping a section of the second steel pipe on the mattress layer 7, adjusting the clamping plate 604 again to enable the V-shaped groove 605 to clamp and fix the second steel pipe, and adjusting the screw 607 to enable a wire gap to be kept between the arc-shaped plate 606 and the grouting pipe 4;
step 13: connecting the grouting pipe 4 with a grouting system, slightly lifting the grouting pipe 4 to enable a gap to be formed between the lower end of the grouting pipe 4 and the rubber plug 103, adjusting the screw 607 to enable the arc-shaped plate 606 to clamp and fix the grouting pipe 4, starting grouting, and continuously pouring grout out through the lower end of the grouting pipe 4 and penetrating the sand well 9 to form a composite pile foundation 10 until the grout reaches the bottom of the mattress layer 7 and stops grouting;
step 14: slightly adjusting the screw 607 to keep a wire gap between the arc plate 606 and the grouting pipe 4, pressing the grouting pipe 4, plugging the lower end of the embedded grouting pipe 4 by the rubber plug 103, continuing grouting, filling the grouting bag 5 with the grout along the grouting small hole, expanding the grouting bag 5 and extruding the sand well 9 to form an expanded body 1001 of the composite pile foundation 10 at the corresponding position;
step 15: the grouting system is disassembled, the motor 612 is started to drive the roller 611 to rotate, the grouting pipe 4 is pulled out in an auxiliary mode, and the grouting system and the grouting pipe 4 are cleaned;
step 16: and (5) repeating the steps 9-15 to complete the construction of all the composite pile foundations 10, and finally finishing the foundation treatment after all the composite pile foundations 10 are molded to the design strength.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "disposed" are to be construed broadly, e.g. as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical features of the present invention which are not described in the above embodiments may be implemented by or using the prior art, and are not described herein again, of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and variations, modifications, additions or substitutions which may be made by those skilled in the art within the spirit and scope of the present invention should also fall within the protection scope of the present invention.
Claims (9)
1. The soft soil foundation treatment device is characterized by comprising a pile shoe (1), wherein a positioning ring (101) is arranged on the upper end surface of the pile shoe (1), the outer diameter of the positioning ring (101) is smaller than that of the pile shoe (1), and a positioning column (102) is arranged on the pile shoe (1) and positioned in the center of the positioning ring (101); a pile pipe (2) is arranged on the outer side of the positioning ring (101), and the bottom of the pile pipe (2) abuts against the pile shoe (1);
a sleeve (3) is arranged on the outer side of the positioning column (102), a plurality of water filtering holes (301) are formed in the pipe wall of the lower end of the sleeve (3), and the upper end of the sleeve (3) is connected with a water pumping device through a water drainage pipe;
the outer diameter of the grouting pipe (4) is smaller than the inner diameter of the sleeve (3), the upper end of the grouting pipe (4) is connected with a grouting system, and the other end of the grouting pipe penetrates into the sleeve (3) and abuts against the positioning column (102);
the upper ends of the pile pipe (2), the sleeve (3) and the grouting pipe (4) extend out of the ground, and the extending end of the grouting pipe (4) is higher than the sleeve (3).
2. A soft soil foundation treatment device as claimed in claim 1, wherein the pile pipe (2) is formed by connecting a plurality of sections of steel pipes through threads; the sleeve (3) is formed by connecting a plurality of sections of steel pipes through threads, and the water filtering holes (301) are uniformly distributed on the outer wall of the section of steel pipe II at the bottommost layer of the sleeve (3).
3. A soft soil foundation treatment device as claimed in claim 2, wherein a plurality of grouting small holes are evenly distributed in the middle of the pipe wall of the grouting pipe (4) in the circumferential direction, a grouting bag (5) is sleeved on the grouting pipe (4) at a position corresponding to the grouting small holes, and the grouting bag (5) is communicated with the grouting pipe (4) through the grouting small holes.
4. A soft soil foundation treatment device according to claim 3, wherein a support pipe (501) is sleeved on the grouting pipe (4) at a position corresponding to the small grouting hole, two ends of the support pipe (501) are provided with inwardly-protruding elastic pieces (504), a groove is arranged on the pipe wall of the grouting pipe (4) at a position corresponding to the elastic pieces (504), and the elastic pieces (504) are clamped in the groove; a through hole (502) corresponding to the small grouting hole is formed in the middle of the supporting tube (501), a rubber guide tube (401) is arranged in the small grouting hole and the through hole (502), an outward flange is arranged at one end, arranged in the grouting tube (4), of the rubber guide tube (401), and the outward flange abuts against the inner wall of the grouting tube (4);
the grouting bag (5) is a rubber sleeve with an upper opening and a lower opening, and the upper end and the lower end of the rubber sleeve are sleeved at the two ends of the supporting tube (501) through a clamping ring (503).
5. A soft soil foundation treatment device as claimed in claim 3, characterised in that the support pipe (501) is a steel pipe with a wall thickness of less than 1 mm.
6. A soft soil foundation treatment device as claimed in claim 1, wherein a rubber plug (103) is fixedly arranged at the center of the upper end of the positioning column (102), the rubber plug (103) is conical and the conical tip is upward, and the grouting pipe (4) abuts against the rubber plug (103).
7. A soft soil foundation treatment device according to any one of claims 1 to 6, further comprising a grouting pipe auxiliary device (6), wherein the grouting pipe auxiliary device (6) comprises a bracket (601), a bidirectional screw rod (602) is rotatably arranged on the bracket (601), a screw nut (603) is arranged at each end of the bidirectional screw rod (602) through threaded connection, a clamping plate (604) is arranged on the inner side of the screw nut (603), a guide rod (609) is arranged on the bracket (601), the clamping plate (604) is sleeved on the guide rod (609), and V-shaped grooves (605) are arranged on the opposite surfaces of the two clamping plates (604);
an arc-shaped plate (606) is arranged on the inner side of the clamping plate (604) and right above the V-shaped groove (605) through a spring (608), a screw rod (607) is arranged on the clamping plate (604) and in threaded connection with the position corresponding to the arc-shaped plate (606), and the screw rod (607) is pressed against the arc-shaped plate (606).
8. A soft soil foundation treatment device according to any one of claims 1 to 7, wherein a fixing plate (610) is arranged on the clamping plate (604) and above the arc-shaped plate (606), a motor (612) is horizontally arranged on the fixing plate (610), a roller (611) is connected to a driving shaft of the motor (612), and the roller (611) is arranged on two sides of the grouting pipe (4) and is in contact with the outer wall of the grouting pipe (4).
9. A construction method for treating a foundation using the soft soil foundation treatment device of claim 8, comprising the steps of:
step 1: laying a mattress layer (7) on the ground layer (8), determining a pile position on the mattress layer (7), and then placing the pile shoe (1) on the pile position to prepare for sinking;
step 2: the lower end of the second steel pipe with the water filtering hole (301) is clamped on the positioning column (102);
and step 3: clamping a section of steel pipe on the positioning ring (101);
and 4, step 4: sinking a section of steel pipe I together with the pile shoe (1), and leaving 300mm to expose the mattress layer (7) so as to facilitate the continuous installation of the next section;
and 5: continuously connecting the first steel pipe and the second steel pipe through threads, continuously sinking, and leaving 300mm to expose the mattress layer (7);
step 6: according to the method in the step 5, continuously installing the first steel pipe and the second steel pipe until the first steel pipe and the second steel pipe reach the designed elevation;
and 7: pouring prepared sand into a gap between the pile pipe (2) and the casing pipe (3), pulling out the pile pipe (2) while pouring the sand, and filling the space between the casing pipe (3) and the stratum (8) with the sand until the pile pipe (2) is pulled out and the sand is poured to the bottom of the mattress layer (7) to form a sand well (9);
and 8: repeating the steps 2-7 according to the pile position determined in the step 1 to complete the construction of all pile holes;
and step 9: connecting the casing (3) with a water pumping device through a water drainage pipe, pumping underground water out to enable the stratum (8) to be subjected to drainage consolidation, stopping pumping water and separating the casing (3) from the water drainage pipe after the consolidation of the stratum (8) meets the design requirement;
step 10: sleeving the supporting pipe (501) on the grouting pipe (4) to enable the elastic sheet (504) to be clamped in the groove, penetrating one end, provided with a flanging, of the rubber conduit (401) into the through hole (502) and the grouting small hole, and fixing the upper end and the lower end of the rubber sleeve on the upper end and the lower end of the supporting pipe (501) by using a clamping ring (503);
step 11: penetrating the grouting pipe (4) into the sleeve (3), installing the grouting pipe auxiliary device (6) after the grouting bag (5) enters the sleeve (3), rotating a bidirectional screw rod (602) to adjust the clamping plate (604), so that a V-shaped groove (605) clamps the sleeve (3), adjusting the screw rod (607) to keep a wire gap between the arc plate (606) and the grouting pipe (4), assisting the grouting pipe (4) to vertically penetrate the sleeve (3) in a centered manner, and enabling the conical tip of the rubber plug (103) to be embedded into the bottom end of the grouting pipe (4);
step 12: rotating the bidirectional screw rod (602), loosening the clamping plate (604), extracting the sleeve (3) in sections, retaining a section of the second steel pipe on the mattress layer (7), adjusting the clamping plate (604) again to enable the second steel pipe to be clamped and fixed by the V-shaped groove (605), and adjusting the screw rod (607) to enable a wire gap to be reserved between the arc-shaped plate (606) and the grouting pipe (4);
step 13: connecting the grouting pipe (4) with a grouting system, slightly lifting the grouting pipe (4) to enable a gap to be reserved between the lower end of the grouting pipe (4) and the rubber plug (103), adjusting the screw (607) to enable the arc-shaped plate (606) to clamp and fix the grouting pipe (4), starting grouting, and continuously pouring grout out from the lower end of the grouting pipe (4) and penetrating the sand well (9) to form a composite pile foundation (10) until the grout reaches the bottom of the mattress layer (7) and stopping grouting;
step 14: slightly adjusting the screw (607), so that a wire gap is reserved between the arc-shaped plate (606) and the grouting pipe (4), pressing down the grouting pipe (4), plugging the lower end of the grouting pipe (4) by the rubber plug (103), continuing grouting, filling grout into the grouting bag (5) along the grouting small hole, beginning to expand the grouting bag (5) and extruding the sand well (9), and forming an expanded body (1001) of the composite pile foundation (10) at a corresponding position;
step 15: the grouting system is disassembled, the motor (612) is started to drive the roller (611) to rotate, the grouting pipe (4) is pulled out in an auxiliary mode, and the grouting system and the grouting pipe (4) are cleaned;
step 16: and (5) repeating the steps 9-15 to complete the construction of all the composite pile foundations (10), and finally finishing the foundation treatment after all the composite pile foundations (10) are molded to the designed strength.
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| CN202010996927.0A CN112127345B (en) | 2020-09-21 | 2020-09-21 | Soft soil foundation treatment device and foundation treatment construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114045810A (en) * | 2021-12-06 | 2022-02-15 | 浙江广川工程咨询有限公司 | Soft soil foundation reinforcement processing apparatus |
| CN115467318A (en) * | 2022-08-25 | 2022-12-13 | 中建八局第一建设有限公司 | Soft soil foundation treatment structure |
| CN116065564A (en) * | 2023-02-01 | 2023-05-05 | 广东开瑞建设有限公司 | Drainage structure for foundation reinforcement and construction method thereof |
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| CN116065564B (en) * | 2023-02-01 | 2023-09-01 | 广东开瑞建设有限公司 | Drainage structure for foundation reinforcement and construction method thereof |
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