CN110485450B - Water stopping method for civil engineering foundation - Google Patents
Water stopping method for civil engineering foundation Download PDFInfo
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- CN110485450B CN110485450B CN201910752809.2A CN201910752809A CN110485450B CN 110485450 B CN110485450 B CN 110485450B CN 201910752809 A CN201910752809 A CN 201910752809A CN 110485450 B CN110485450 B CN 110485450B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention belongs to the technical field of underground water-stopping enclosures, in particular to a water-stopping method for a civil engineering foundation, wherein water-stopping piles adopted by the method comprise steel box piles; both the front side surface and the rear side surface of the steel box pile are provided with guard plates; a pair of transverse plates is fixedly connected between the two guard plates; a first chamfer is arranged on one side of the transverse plates close to each other; a second chamfer matched with the first chamfer is arranged at the position where the bottom of the steel box pile is opposite to the transverse plate; the lower edge of the guard plate is provided with a groove; two sides of the steel box pile corresponding to the transverse plate are respectively provided with a T-shaped groove and a T-shaped bulge; according to the invention, through splicing and inserting the multiple sections of steel box piles in the vertical direction, the small-sized pile driver can be used for inserting and driving, the cost increased by using the large-sized pile driver is reduced, meanwhile, the multiple sections of steel box piles can be conveniently transported, a smaller transport vehicle can be used for transporting on the road surface with poor road conditions, and the working efficiency is increased.
Description
Technical Field
The invention belongs to the technical field of underground water-stopping enclosures, and particularly relates to a water-stopping method for a civil engineering foundation.
Background
The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation. Before excavation, an excavation scheme is determined according to geological and hydrological data and the conditions of buildings nearby the site, and waterproof drainage work is performed. The person who is not excavated can use the method of putting the side slope to stabilize the earth slope, and the size of the slope is determined according to the relevant construction regulations. When a deeper foundation pit and a building adjacent to the deeper foundation pit are excavated, a foundation pit wall supporting method, a concrete-sprayed wall protecting method and a large foundation pit are used, and even an underground continuous wall and a columnar column type bored pile are used for interlocking, so that an outer soil layer is prevented from collapsing; for those who have no influence on nearby buildings, the underground water level can be reduced by a well point method, and slope releasing open cut is adopted; in cold regions, natural cold freezing method can be adopted for excavation and the like.
The waterproof curtain refers to a general name of a waterproof series at the periphery of the engineering main body. The continuous water stopping body is used for preventing or reducing groundwater on the side wall of the foundation pit and the bottom of the foundation pit from flowing into the foundation pit and being adopted.
Some foundation pits which are not very deep and big are divided into 3 parts by the enclosure of the foundation pit:
the first part is a retaining pile part which mainly functions as a retaining wall, and the form may be a reinforced concrete cast-in-place pile or other forms of pile with a certain space between the piles but capable of retaining soil.
The second part is a waterproof curtain part which is used for solidifying soil behind the retaining wall and blocking water layer communication inside and outside the foundation pit, and the waterproof curtain part can be in a cement soil mixing pile or compaction grouting mode.
The third part is a support, and the underground continuous wall is another form of foundation pit enclosure and is mainly used for deep and large foundation pits.
Common waterproof curtains include a steel cofferdam, a high-pressure jet grouting pile, a deep mixing pile waterproof curtain, a jet grouting pile waterproof curtain, and recently, a spiral drilling machine plain concrete or mud jacking waterproof curtain appears; the underground enclosing structure forms like underground continuous walls, drilled secant piles and the like, and because the self-waterproof effect is better, some underground enclosing structures do not need to be applied with waterproof curtains.
When the water stop operation of the steel cofferdam is performed, a large-scale pile driver is needed to insert and beat the steel sheet piles to form the continuous waterproof wall, but the excavation depth of some foundations is large, the needed water stop depth is also deepened, so that long steel sheet piles are needed, the long steel sheet piles need large-scale piling equipment to be used for entering construction, and the equipment use cost is high.
Disclosure of Invention
In order to make up for the defects of the prior art and solve the problems that when the water stopping operation of the steel cofferdam is carried out, a large-scale pile driver is needed to insert and beat steel sheet piles to form a continuous waterproof wall, but the excavation depth of some foundations is large, the needed water stopping depth is also deepened, so that long steel sheet piles are needed, and long steel sheet piles need large-scale pile driving equipment to enter the field for construction, and the equipment use cost is high.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a water stopping method for a civil engineering foundation, which comprises the following steps:
s1, positioning a rotary spraying machine: when the drilling machine is in place, the machine base needs to be stable, the vertical shaft or the turntable needs to be aligned with the hole position, and the position deviation between the drill rod and the grouting body needs to be within 10 mm; after the drilling machine is in place, vertical correction is carried out, the error of the inclination angle is not more than 0.5 degrees, and the verticality of the drilling machine is guaranteed to be within 1 percent;
s2, drilling: forming holes in an air compressor, a clean water pump and a slurry pump under a low-pressure state, and sending the spray head to a designed elevation;
s3, lower slurry pipe: before inserting the grouting pipe, the injection conditions of high-pressure water and air are checked, whether sealing rings of all parts are closed or not is checked, after inserting, a high-pressure water injection test is carried out, and after the sealing rings are qualified, the grout can be injected; if the hole is difficult to insert due to collapse, the high-pressure water nozzle is sprayed by low-pressure water, but the high-pressure water nozzle is wrapped by plastic so as to avoid soil blockage;
s4, connecting a pipeline: after the grouting pipe is lowered to the designed depth, the pipeline is connected, the high-pressure water pump and the air compressor are sequentially started, whether the pressure meets the design requirement is checked, and if the pressure does not meet the requirement, whether the conditions of sealing and a nozzle are normal is checked; if the pressure is normal, starting a cement grouting pump;
s5, rotary jet grouting: the drill rod is continuously rotated and lifted without being interrupted, and is detached, and the drill rod is kept to extend into the lower section by more than 100mm so as to avoid the disjointing of the grouting body; after grouting, covering soil for maintenance to form a first water stop wall;
s6, inserting and beating a water-stopping cofferdam: a pile driver is used for inserting and driving the water stop piles at one side of the grouting holes close to the foundation pit to form a second-layer underground continuous water stop wall;
the water-stopping pile adopted in the invention comprises a steel box pile which is a cuboid box body and is formed by welding steel plates; the front side surface and the rear side surface of the steel box pile are provided with guard plates; a pair of transverse plates is fixedly connected between the two guard plates, and the top of each guard plate is higher than the steel box pile part and is enclosed with the transverse plates to form a positioning groove; a first chamfer is arranged on one side of the transverse plates close to each other; a second chamfer matched with the first chamfer is arranged at the position, corresponding to the transverse plate, of the bottom of each steel box pile, and when vertically adjacent steel box piles are butted, the second chamfer on the upper steel box pile is matched with the first chamfer on the lower steel box pile to play a role in positioning; the lower edge of the guard plate is provided with a groove which is used for reducing the inserting and driving resistance of the steel box pile; the two sides of the steel box piles corresponding to the transverse plates are respectively provided with a T-shaped groove and a T-shaped protrusion, and the T-shaped groove and the T-shaped protrusion are used for sealing connection between the adjacent steel box piles in the transverse direction; when the pile driver is used, the steel box pile is clamped and inserted into a soil layer by the pile driver, when the steel box pile is completely inserted into the soil layer, the pile driver clamps another steel box pile, a second chamfer at the bottom of the steel box pile is aligned with a first chamfer at the top of the steel box pile in the soil layer, the steel box pile is put down, then the steel box pile is inserted and driven continuously, and a plurality of sections of steel box piles are spliced and inserted and driven in the vertical direction; after the vertical steel box piles are inserted and driven, the pile driver is used for clamping the steel box piles to perform inserting and driving in the transverse direction, the T-shaped protrusions on one side of the steel box piles are inserted into the T-shaped grooves on one side of the adjacent steel box piles at the moment, then the steel box piles are inserted and driven in place through the pile driver, repeated operation is carried out continuously until the steel box piles form the water stop cofferdam, and the water seepage amount of the foundation pit is reduced.
Preferably, a water inlet and a water return hole are symmetrically formed in the steel box pile, the water inlet is communicated with a high-pressure water source, and the water return hole is communicated with the circulating pool; high-pressure water flow is introduced into the steel box pile through the water inlet hole, and the high-pressure water jet cuts the soil body to form cement paste, so that the insertion efficiency of the steel box pile is improved; introducing high-pressure water flow through the water inlet hole in the process of inserting and driving the steel box pile, performing jet cutting on a soil body at the bottom of the steel box pile when the high-pressure water flow is jetted out from the bottom of the water inlet hole, mixing the cut soil body with water to form slurry, and allowing the slurry to flow out of the water return hole and enter a circulating pool for treatment; the speed of inserting the steel box pile is accelerated, and the influence on the sealing performance caused by deformation of the steel box pile due to overlarge pressure in the inserting and driving process of the pile driver is reduced.
Preferably, the guard plate is connected with the steel box pile in a sliding manner; a group of sliding grooves are formed in the two sides, close to the transverse plate, of the steel box pile, sliding blocks are connected in the sliding grooves in a sliding mode, and the sliding blocks are fixedly connected with the protection plate; through inserting and beating the guard plates preferentially, a guard wall is formed at the bottom of the steel box pile, so that the soil body is prevented from collapsing when being cut by high-pressure water flow; when carrying out the steel case stake and inserting and beating, preferentially insert and beat the backplate for the backplate forms semi-enclosed dado in steel case stake bottom, makes the high-pressure rivers only cut the soil body between the two backplates, reduces the soil body cutting volume, sinks when preventing the high-pressure rivers cutting soil body simultaneously, reduces steel case stake and inserts and beat efficiency.
Preferably, the bottom of the water return hole is provided with a conical head, the circumference of the conical surface of the conical head is uniformly provided with a group of filtering holes, the filtering holes are communicated with the water return hole, and the filtering holes are used for preventing foreign matters from blocking the water return hole; because contain the great stone of diameter usually in the aquifer, when the steel box pile was inserted and is beaten the aquifer, the return water hole was blockked up to the too big stone of diameter in the grout can be prevented to conical head cooperation filtration pore, influences high-pressure rivers cutting efficiency, reduces the work of clearance return water hole.
Preferably, a through hole is formed between the water return hole and the water inlet hole, and a rotating shaft is connected in the through hole in a sliding manner; the bottom of the rotating shaft is fixedly connected with the conical head through a cross rod; one end of the cross rod, which is far away from the conical head, is fixedly connected with a conical spray head, and the spray head is communicated with the water inlet hole; the positions of the conical head and the spray head can be exchanged by rotating the rotating shaft; through rotating the pivot, change the position of conical head and shower nozzle, with return water hole and high-pressure water source intercommunication, inlet opening and circulation pond intercommunication simultaneously, can be so that return water hole blowout high-pressure rivers, carry out the cutting work of the soil body for steel box pile is inserted and is beaten in-process both sides and evenly descend, guarantees the straightness that hangs down of steel box pile, and then makes horizontal adjacent steel box pile connect closely, increases stagnant water ability.
Preferably, the through hole is a counter bore, a spring is sleeved on a rotating shaft corresponding to the counter bore of the through hole, and a clamping ring is fixedly connected to the rotating shaft at the top of the spring; a group of crushing heads are arranged on the peripheries of the conical head and the spray head, and diamonds are embedded in the tops of the crushing heads; run into the great stone of diameter when the steel case stake is inserted and is beaten, when the steel case stake is difficult to insert and beat, connect the pivot top through the vibration hammer, vibrate the countershaft and beat, the pivot drives broken head and carries out the breakage to the stone, and the stone after the breakage is discharged through the return water hole along with mud, and then increases the efficiency of inserting and beating of steel case stake, reduces the time limit for a project and delays.
The invention has the following beneficial effects:
1. according to the water stopping method for the civil engineering foundation, the multiple sections of steel box piles are spliced and inserted in the vertical direction, the small pile driver can be used for inserting and driving, the cost increased by using the large pile driver is reduced, meanwhile, the multiple sections of steel box piles can be conveniently transported, a smaller transport vehicle can be used for transporting on the road surface with poor road conditions, and the working efficiency is increased.
2. According to the water stopping method for the civil engineering foundation, the high-pressure water flow is introduced through the water inlet hole, the soil body at the bottom of the steel box pile is subjected to jet cutting when the high-pressure water flow is jetted out from the bottom of the water inlet hole, the cut soil body is mixed with water to form slurry and then discharged, and the inserting speed of the steel box pile is increased.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is an isometric view of a waterstop pile used in the present invention;
fig. 3 is a perspective view of a water stop pile employed in the present invention;
fig. 4 is a front view of a water stop pile employed in the present invention;
FIG. 5 is a plan view of a water stop pile used in the present invention;
FIG. 6 is a cross-sectional view taken at B-B of FIG. 5;
FIG. 7 is an enlarged view of a portion of FIG. 4 at A;
in the figure: the steel box pile comprises a steel box pile 1, a guard plate 11, a transverse plate 12, a first chamfer 14, a second chamfer 15, a groove 16, a T-shaped groove 17, a T-shaped protrusion 18, a water inlet hole 2, a water return hole 21, a sliding groove 22, a sliding block 23, a conical head 24, a filtering hole 25, a through hole 3, a rotating shaft 32, a cross rod 33, a spray head 34, a spring 35, a clamping ring 36 and a crushing head 37.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 7, the water stopping method for a civil engineering foundation of the present invention is characterized in that: the method comprises the following steps:
s1, positioning a rotary spraying machine: when the drilling machine is in place, the machine base needs to be stable, the vertical shaft or the turntable needs to be aligned with the hole position, and the position deviation between the drill rod and the grouting body needs to be within 10 mm; after the drilling machine is in place, vertical correction is carried out, the error of the inclination angle is not more than 0.5 degrees, and the verticality of the drilling machine is guaranteed to be within 1 percent;
s2, drilling: forming holes in an air compressor, a clean water pump and a slurry pump under a low-pressure state, and sending the spray head to a designed elevation;
s3, lower slurry pipe: before inserting the grouting pipe, the injection conditions of high-pressure water and air are checked, whether sealing rings of all parts are closed or not is checked, after inserting, a high-pressure water injection test is carried out, and after the sealing rings are qualified, the grout can be injected; if the hole is difficult to insert due to collapse, the high-pressure water nozzle is sprayed by low-pressure water, but the high-pressure water nozzle is wrapped by plastic so as to avoid soil blockage;
s4, connecting a pipeline: after the grouting pipe is lowered to the designed depth, the pipeline is connected, the high-pressure water pump and the air compressor are sequentially started, whether the pressure meets the design requirement is checked, and if the pressure does not meet the requirement, whether the conditions of sealing and a nozzle are normal is checked; if the pressure is normal, starting a cement grouting pump;
s5, rotary jet grouting: the drill rod is continuously rotated and lifted without being interrupted, and is detached, and the drill rod is kept to extend into the lower section by more than 100mm so as to avoid the disjointing of the grouting body; after grouting, covering soil for maintenance to form a first water stop wall;
s6, inserting and beating a water-stopping cofferdam: a pile driver is used for inserting and driving the water stop piles at one side of the grouting holes close to the foundation pit to form a second-layer underground continuous water stop wall;
the water-stopping pile adopted by the invention comprises a steel box pile 1, wherein the steel box pile 1 is a cuboid and is a box body formed by welding steel plates; the front side surface and the rear side surface of the steel box pile 1 are provided with guard plates 11; a pair of transverse plates 12 is fixedly connected between the two guard plates 11, and the part of the top of each guard plate 11, which is higher than the steel box pile 1, and the transverse plates 12 enclose a positioning groove; a first chamfer 14 is arranged on one side of the transverse plate 12 close to each other; a second chamfer 15 matched with the first chamfer 14 is arranged at the position, corresponding to the transverse plate 12, of the bottom of each steel box pile 1, and when vertically adjacent steel box piles 1 are butted, the second chamfer 15 on the upper steel box pile 1 is matched with the first chamfer 14 on the lower steel box pile 1 to play a role in positioning; the lower edge of the guard plate 11 is provided with a groove 16, and the groove 16 is used for reducing the inserting and driving resistance of the steel box pile 1; two sides of the steel box pile 1 corresponding to the transverse plate 12 are respectively provided with a T-shaped groove 17 and a T-shaped protrusion 18, and the T-shaped groove 17 and the T-shaped protrusion 18 are used for sealing connection between the adjacent steel box piles 1 in the transverse direction; when the pile driver is used, the steel box pile 1 is clamped and inserted into a soil layer by the pile driver, when the steel box pile 1 is completely inserted into the soil layer, the pile driver clamps another steel box pile 1, the second chamfer 15 at the bottom of the steel box pile 1 is aligned to the first chamfer 14 at the top of the steel box pile 1 in the soil layer, then the steel box pile 1 is put down, then the steel box pile 1 is inserted and driven continuously, the multiple sections of steel box piles 1 are spliced and inserted and driven in the vertical direction, the small pile driver can be used for inserting and driving, the cost increased by the large pile driver is reduced, meanwhile, the multiple sections of steel box piles 1 can be transported conveniently, a smaller transport vehicle can be used for transporting on a road with poor road conditions, and the working efficiency is increased; after the vertical steel box piles 1 are inserted and driven, the pile driver is used for clamping the steel box piles 1 to perform inserting and driving in the transverse direction, the T-shaped protrusions 18 on one side of each steel box pile 1 are inserted into the T-shaped grooves 17 on one side of each adjacent steel box pile 1, then the steel box piles 1 are inserted and driven in place through the pile driver, and repeated operation is performed continuously until the steel box piles 1 form the water stop cofferdam, and the water seepage amount of the foundation pit is reduced.
As an embodiment of the invention, a water inlet 2 and a water return 21 are symmetrically arranged on the steel box pile 1, the water inlet 2 is communicated with a high-pressure water source, and the water return 21 is communicated with a circulating pool; high-pressure water flow is introduced through the water inlet hole 2, and high-pressure water jet cuts a soil body to form cement paste, so that the insertion efficiency of the steel box pile 1 is accelerated; high-pressure water flow is introduced through the water inlet hole 2 in the process of inserting and driving the steel box pile 1, when the high-pressure water flow is ejected out of the bottom of the water inlet hole 2, the soil body at the bottom of the steel box pile 1 is subjected to jet cutting, the soil body is mixed with water after being cut to form slurry, and the slurry flows out of the water return hole 21 and enters the circulating pool for treatment; the speed of inserting the steel box pile 1 is accelerated, and the influence on the sealing performance caused by deformation of the steel box pile 1 due to overlarge pressure in the inserting and driving process of the pile driver is reduced.
As an embodiment of the invention, the guard plate 11 is connected with the steel box pile 1 in a sliding manner; a group of sliding grooves 22 are formed in two sides, close to the transverse plate 12, of the steel box pile 1, sliding blocks 23 are connected in the sliding grooves 22 in a sliding mode, and the sliding blocks 23 are fixedly connected with the guard plate 11; through inserting and beating the guard plates 11 preferentially, guard walls are formed at the bottoms of the steel box piles 1, and collapse when high-pressure water flow cuts soil bodies is prevented; when carrying out steel case stake 1 and inserting and beating, preferentially insert and beat backplate 11 for backplate 11 forms semi-closed dado in 1 bottom of steel case stake, makes the high-pressure rivers only cut the soil body between two backplate 11, reduces the soil body cutting volume, sinks when preventing the high-pressure rivers cutting soil body simultaneously, reduces steel case stake 1 and inserts and beat efficiency.
As an embodiment of the present invention, a conical head 24 is disposed at the bottom of the water return hole 21, a group of filtering holes 25 are uniformly disposed on the circumference of the conical surface of the conical head 24, the filtering holes 25 are communicated with the water return hole 21, and the filtering holes 25 are used for preventing foreign matters from blocking the water return hole 21; because contain the great stone of diameter in the aquifer usually, when steel box pile 1 inserted and beat the aquifer, cone 24 cooperation filtration hole 25 can prevent among the grout that the too big stone of diameter from blockking up return water hole 21, influences high-pressure water stream cutting efficiency, reduces the work of clearance return water hole 21.
As an embodiment of the invention, a through hole 3 is formed between the water return hole 21 and the water inlet hole 2, and a rotating shaft 32 is slidably connected in the through hole 3; the bottom of the rotating shaft 32 is fixedly connected with the conical head 24 through a cross rod 33; one end of the cross bar 33, which is far away from the conical head 24, is fixedly connected with a conical spray head 34, and the spray head 34 is communicated with the water inlet hole 2; the positions of the conical head 24 and the spray head 34 can be exchanged by rotating the rotating shaft 32; through rotating the pivot 32, change conical head 24 and shower nozzle 34's position, with return water hole 21 and high-pressure water source intercommunication simultaneously, inlet opening 2 and circulation pond intercommunication can be so that return water hole 21 blowout high-pressure rivers, carry out the cutting work of the soil body for steel box pile 1 is inserted and is beaten in-process both sides and evenly descend, guarantees the straightness that hangs down of steel box pile 1, and then makes horizontal adjacent steel box pile 1 connect closely, increases stagnant water ability.
As an embodiment of the present invention, the through hole 3 is a countersunk hole, a spring 35 is sleeved on the rotating shaft 32 corresponding to the countersunk part of the through hole 3, and a snap ring 36 is fixedly connected to the rotating shaft 32 at the top of the spring 35; a group of crushing heads 37 are arranged on the peripheries of the conical head 24 and the spray head 34, and diamonds are embedded at the tops of the crushing heads 37; run into the great stone of diameter when steel case stake 1 is inserted and is beaten, when steel case stake 1 is difficult to be inserted and beat, connect pivot 32 top through the vibration hammer, vibrate to pivot 32 and beat, pivot 32 drives broken head 37 and carries out the breakage to the stone, and the stone after the breakage is discharged through return water hole 21 along with mud, and then increases the efficiency of beating of inserting of steel case stake 1, reduces the time limit for a project and delays.
When the pile driver is used, the steel box pile 1 is clamped and inserted into a soil layer by the pile driver, when the steel box pile 1 is completely inserted into the soil layer, the pile driver clamps another steel box pile 1, the second chamfer 15 at the bottom of the steel box pile 1 is aligned to the first chamfer 14 at the top of the steel box pile 1 in the soil layer, then the steel box pile 1 is put down, then the steel box pile 1 is inserted and driven continuously, the multiple sections of steel box piles 1 are spliced and inserted and driven in the vertical direction, the small pile driver can be used for inserting and driving, the cost increased by the large pile driver is reduced, meanwhile, the multiple sections of steel box piles 1 can be transported conveniently, a smaller transport vehicle can be used for transporting on a road with poor road conditions, and the working efficiency is increased; after the vertical steel box piles 1 are inserted and driven, the pile driver is used for clamping the steel box piles 1 to perform insertion and driving in the transverse direction, the T-shaped protrusions 18 on one side of each steel box pile 1 are inserted into the T-shaped grooves 17 on one side of each adjacent steel box pile 1, then the steel box piles 1 are inserted and driven in place through the pile driver, and the operation is repeated continuously until the steel box piles 1 form a water-stopping cofferdam, so that the water seepage amount of foundation pits is reduced; high-pressure water flow is introduced through the water inlet hole 2 in the process of inserting and driving the steel box pile 1, when the high-pressure water flow is ejected out of the bottom of the water inlet hole 2, the soil body at the bottom of the steel box pile 1 is subjected to jet cutting, the soil body is mixed with water after being cut to form slurry, and the slurry flows out of the water return hole 21 and enters the circulating pool for treatment; the inserting speed of the steel box pile 1 is increased, and the deformation of the steel box pile 1 caused by overlarge pressure in the inserting and driving process of the pile driver is reduced, so that the sealing performance is influenced; when the steel box pile 1 is inserted and driven, the guard plates 11 are preferentially inserted and driven, so that the guard plates 11 form a semi-closed guard wall at the bottom of the steel box pile 1, high-pressure water flow only cuts soil between the two guard plates 11, the cutting amount of the soil is reduced, collapse of the high-pressure water flow when the soil is cut is prevented, and the inserting and driving efficiency of the steel box pile 1 is reduced; by rotating the rotating shaft 32, the positions of the conical head 24 and the spray head 34 are changed, the water return hole 21 is communicated with a high-pressure water source, and the water inlet hole 2 is communicated with the circulating pool, so that high-pressure water flow can be sprayed out from the water return hole 21, the cutting work of a soil body is carried out, two sides of the steel box piles 1 are uniformly lowered in the inserting and beating process, the verticality of the steel box piles 1 is ensured, and further the transversely adjacent steel box piles 1 are tightly connected, and the water stopping capacity is improved; run into the great stone of diameter when steel case stake 1 is inserted and is beaten, when steel case stake 1 is difficult to be inserted and beat, connect pivot 32 top through the vibration hammer, vibrate to pivot 32 and beat, pivot 32 drives broken head 37 and carries out the breakage to the stone, and the stone after the breakage is discharged through return water hole 21 along with mud, and then increases the efficiency of beating of inserting of steel case stake 1, reduces the time limit for a project and delays.
The front, the back, the left, the right, the upper and the lower are all based on the figure 2 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A water stopping method for civil engineering foundation is characterized in that: the method comprises the following steps:
s1, positioning a rotary spraying machine: when the drilling machine is in place, the machine base needs to be stable, the vertical shaft or the turntable needs to be aligned with the hole position, and the position deviation between the drill rod and the grouting body needs to be within 10 mm; after the drilling machine is in place, vertical correction is carried out, the error of the inclination angle is not more than 0.5 degrees, and the verticality of the drilling machine is guaranteed to be within 1 percent;
s2, drilling: forming holes in an air compressor, a clean water pump and a slurry pump under a low-pressure state, and sending the spray head to a designed elevation;
s3, lower slurry pipe: before inserting the grouting pipe, the injection conditions of high-pressure water and air are checked, whether sealing rings of all parts are closed or not is checked, after inserting, a high-pressure water injection test is carried out, and after the sealing rings are qualified, the grout can be injected; if the hole is difficult to insert due to collapse, the high-pressure water nozzle is sprayed by low-pressure water, but the high-pressure water nozzle is wrapped by plastic so as to avoid soil blockage;
s4, connecting a pipeline: after the grouting pipe is lowered to the designed depth, the pipeline is connected, the high-pressure water pump and the air compressor are sequentially started, whether the pressure meets the design requirement is checked, and if the pressure does not meet the requirement, whether the conditions of sealing and a nozzle are normal is checked; if the pressure is normal, starting a cement grouting pump;
s5, rotary jet grouting: the drill rod is continuously rotated and lifted without being interrupted, and is detached, and the drill rod is kept to extend into the lower section by more than 100mm so as to avoid the disjointing of the grouting body; after grouting, covering soil for maintenance to form a first water stop wall;
s6, inserting and beating a water-stopping cofferdam: a pile driver is used for inserting and driving the water stop piles at one side of the grouting holes close to the foundation pit to form a second-layer underground continuous water stop wall;
the adopted water stop pile comprises a steel box pile (1), wherein the steel box pile (1) is a cuboid and is a box body formed by welding steel plates; guard plates (11) are arranged on the front side face and the rear side face of the steel box pile (1); a pair of transverse plates (12) is fixedly connected between the two guard plates (11), and the part of the top of each guard plate (11) higher than the steel box pile (1) and the transverse plates (12) form a positioning groove; a first chamfer (14) is arranged on one side of the transverse plates (12) close to each other; a second chamfer (15) matched with the first chamfer (14) is arranged at the position, corresponding to the transverse plate (12), of the bottom of each steel box pile (1), and when vertically adjacent steel box piles (1) are butted, the second chamfer (15) on the upper steel box pile (1) is matched with the first chamfer (14) on the lower steel box pile (1) to play a role in positioning; a groove (16) is formed in the lower edge of the guard plate (11), and the groove (16) is used for reducing the inserting and driving resistance of the steel box pile (1); the two sides of the steel box piles (1) corresponding to the transverse plate (12) are respectively provided with a T-shaped groove (17) and a T-shaped protrusion, and the T-shaped groove (17) and the T-shaped protrusion are used for sealing connection between the adjacent steel box piles (1); a water inlet hole (2) and a water return hole (21) are symmetrically formed in the steel box pile (1), the water inlet hole (2) is communicated with a high-pressure water source, and the water return hole (21) is communicated with a circulating pool; high-pressure water flow is introduced through the water inlet hole (2), and high-pressure water jet cuts a soil body to form cement paste, so that the insertion efficiency of the steel box pile (1) is accelerated; the guard plate (11) is connected with the steel box pile (1) in a sliding manner; a group of sliding grooves (22) are formed in the two sides, close to the transverse plate (12), of the steel box pile (1), sliding blocks (23) are connected in the sliding grooves (22) in a sliding mode, and the sliding blocks (23) are fixedly connected with the guard plate (11); through inserting guard plate (11) preferentially, form the dado in steel box pile (1) bottom, prevent that high-pressure rivers from collapsing when cutting the soil body.
2. The water stopping method for the civil engineering foundation according to claim 1, characterized in that: return water hole (21) bottom is equipped with conical head (24), and a set of filtration hole (25) have evenly been seted up to the circumference on the conical surface of conical head (24), filters hole (25) and return water hole (21) intercommunication, filters hole (25) and is used for preventing that foreign matter from blockking return water hole (21).
3. The water stopping method for the civil engineering foundation according to claim 2, characterized in that: a through hole (3) is formed between the water return hole (21) and the water inlet hole (2), and a rotating shaft (32) is connected in the through hole (3) in a sliding manner; the bottom of the rotating shaft (32) is fixedly connected with the conical head (24) through a cross rod (33); one end of the cross rod (33) far away from the conical head (24) is fixedly connected with a conical spray head (34), and the spray head (34) is communicated with the water inlet hole (2); the positions of the conical head (24) and the spray head (34) can be switched by rotating the rotating shaft (32).
4. A water stopping method for a civil engineering foundation according to claim 3, characterized in that: the through hole (3) is a counter bore, a spring (35) is sleeved on the rotating shaft (32) corresponding to the counter bore of the through hole (3), and a clamping ring (36) is fixedly connected to the rotating shaft (32) at the top of the spring (35); the periphery of conical head (24) and shower nozzle (34) all is equipped with a set of broken head (37), and broken head (37) top is inlayed and is had the diamond.
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| CN102286985A (en) * | 2011-07-11 | 2011-12-21 | 中交一航局第四工程有限公司 | Method for constructing dual high-pressure jet grouting pile waterproof curtain |
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