CN113737786A - Pile end bottom grouting device, cast-in-place pile and construction method thereof - Google Patents
Pile end bottom grouting device, cast-in-place pile and construction method thereof Download PDFInfo
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- CN113737786A CN113737786A CN202111162217.9A CN202111162217A CN113737786A CN 113737786 A CN113737786 A CN 113737786A CN 202111162217 A CN202111162217 A CN 202111162217A CN 113737786 A CN113737786 A CN 113737786A
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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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
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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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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Abstract
The invention relates to the technical field of foundation foundations, in particular to a pile end bottom grouting device, a cast-in-place pile and a construction method thereof, and aims to overcome the defect that the grouting cavity is difficult to control in breaking time and conditions in the prior art. The pile end bottom grouting device comprises a fixing plate; the grout storage bag is fixed on the fixing plate, the grout storage bag forms an accommodating cavity suitable for accommodating grout or the grout storage bag and the fixing plate enclose an accommodating cavity suitable for accommodating grout, the grout storage bag is provided with an filling state and a hollow furling state, the grout storage bag is filled with grout inside to bear the pile body, the grout storage bag is preset with a fixed limit pressure-bearing strength value, and the volume of the grout storage bag is fixed in the filling state.
Description
Technical Field
The invention relates to the technical field of foundation foundations, in particular to a pile end bottom grouting device, a cast-in-place pile and a construction method thereof.
Background
At present, in the field of foundation foundations, the post-grouting of a cast-in-place pile end mainly comprises open grouting and closed grouting. The invention discloses a closed grouting method, which mainly adopts steel plate capsule grouting, and comprises a grouting capsule, a grouting pipe and a fixing plate, wherein the steel plate capsule grouting is adopted in the closed grouting, as disclosed in the invention patent with the publication number of CN110896646B and the name of 'pile bottom grouting device and using method, grouting pile body and construction method thereof', and after the filling of the filling pile is finished, grouting is carried out in the grouting capsule through the grouting pipe to form a pile bottom expanding head. However, the grouting capsule expands with the increase of pressure, and the relationship between the grouting capsule and the grouting pressure and the grouting amount and the volume of the enlarged head in the closed grouting cavity are difficult to control, so that the time and conditions for breaking the grouting capsule are difficult to control, and the bearing capacity of the cast-in-place pile is affected.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the fracture timing and conditions of the grouting cavity are difficult to control in the prior art, so that the pile end bottom grouting device, the grouting pile and the construction method thereof can accurately control the fracture timing and conditions of the grouting cavity.
In order to solve the above technical problem, the present invention provides a pile tip bottom grouting device, including:
a fixing plate;
the grout storage bag is fixed on the fixing plate, the grout storage bag forms an accommodating cavity suitable for accommodating grout or the grout storage bag and the fixing plate enclose an accommodating cavity suitable for accommodating grout, the grout storage bag is provided with an filling state and a hollow furling state, the grout storage bag is filled with grout inside to bear the pile body, the grout storage bag is preset with a fixed limit pressure-bearing strength value, and the volume of the grout storage bag is fixed in the filling state.
Optionally, the pulp storage bag is made of a chemical synthetic fiber cloth or a plastic film.
Optionally, a weak region is arranged on the pulp storage bag, and the pressure-bearing strength of the weak region is smaller than that of other parts of the pulp storage bag so as to form a pulp outlet region when the pulp storage bag is pressed.
Optionally, the method further includes:
the grouting pipe is communicated with the inner cavity of the grout storage bag and is suitable for grouting into the grout storage bag;
the first one-way valve is arranged at the communication position of the grouting pipe and the grout storage bag and is suitable for preventing blockage in the grout storage bag from entering the grouting pipe.
Optionally, a first grout outlet is formed in the pipe wall of the grouting pipe, and the first check valve comprises:
the first water stopping adhesive tape is wound on the part of the grouting pipe, which is provided with a first grout outlet;
the first rubber sleeve is directly or indirectly sleeved on the outer side of the first water stopping adhesive tape;
the first water-stopping adhesive tape and the first rubber sleeve have a sealing state of tightening towards the direction close to the grouting pipe and an opening state of forming a gap with the grouting pipe under the action of the pressure in the grouting pipe;
and the first hard sheet is clamped between the first water stopping adhesive tape and the first rubber sleeve and is arranged corresponding to the first slurry outlet hole.
Optionally, the slip casting pipe includes:
the first pulp outlet part is positioned in the inner cavity of the pulp storage bag;
the interface penetrates through the fixing plate and is communicated with the first slurry outlet part;
and the pulp inlet pipe is communicated with the interface in a sealing way.
Optionally, the fixed plate is an annular plate, and the pulp storage bag is of an annular structure matched with the annular plate.
Optionally, an annular stopper extending to the inner ring of the pulp storage bag is arranged on the edge of the inner ring of the fixing plate.
Optionally, the method further includes:
the grout supplementing pipe is communicated with the inner area of the annular stopper and is suitable for injecting grout into the pile hole;
and the second one-way valve is arranged at the communication position of the grout supplementing pipe and the inner area of the annular stopper and is suitable for preventing the blockage in the pile hole from entering the grout supplementing pipe.
Optionally, a second grout outlet is formed in the pipe wall of the grout supplementing pipe, and the second one-way valve comprises:
the second water stopping adhesive tape is wound on the position of the pulp supplementing pipe, which is provided with a second pulp outlet hole;
the second rubber sleeve is directly or indirectly sleeved on the outer side of the second water stopping adhesive tape;
the second water-stopping adhesive tape and the second adhesive sleeve are in a sealing state of being tightened towards the direction close to the slurry supplementing pipe and in an opening state of forming a gap with the slurry supplementing pipe under the action of the internal pressure of the slurry supplementing pipe;
and the second hard sheet is clamped between the second water stopping adhesive tape and the second rubber sleeve and is arranged corresponding to the second slurry outlet hole.
Optionally, the slurry supplementing pipe is provided with a second slurry outlet part extending to the inner area of the annular stopper, and the second slurry outlet part is an annular pipeline extending along the inner wall of the annular stopper.
Optionally, a detection port is arranged on the fixing plate, and the detection port is suitable for filling media into the pulp storage bag.
Optionally, the method further includes:
the safety cover, with the connection can be dismantled to the fixed plate, and is suitable for to cover before the construction and establishes the outside of storing up the thick liquid bag.
The present invention also provides a cast-in-place pile, comprising:
the pile end bottom grouting device;
and the reinforcement cage is connected with a fixing plate of the pile end bottom grouting device.
The invention also provides a construction method of the cast-in-place pile, which sequentially comprises the following steps:
s1, forming a pile hole, and cleaning sediments in the pile hole;
s2, sinking a reinforcement cage with the lower end provided with the pile end bottom grouting device to the bottom of the pile hole;
s3, pouring concrete into the pile hole to form a cast-in-place pile;
and S4, grouting into the grout storage bag to form the pile bottom expanded head.
Optionally, in step S4, control is performed according to the soil property of the pile hole: if the soil is sandy soil, controlling the actual grouting amount and the grouting pressure to be larger than the preset value of the slurry storage bag so as to break the slurry storage bag; and if the soil is cohesive soil, controlling the actual grouting amount and the grouting pressure to be smaller than the preset value of the slurry storage bag, and avoiding the fracture of the slurry storage bag.
The technical scheme of the invention has the following advantages:
1. according to the pile end bottom grouting device provided by the invention, the existing grouting capsule is replaced by the grout storage bag, the volume of the grouting capsule is fixed in the filling state, the grouting capsule cannot expand along with the increase of the internal pressure, and a fixed limit bearing strength value is preset. During actual grouting, if the grouting bag is broken, controlling the actual grouting amount and the grouting pressure to be larger than the preset value of the grouting storage bag; if the grouting bag is not required to be broken, the actual grouting amount and the grouting pressure are controlled to be smaller than the preset value of the grouting bag. Therefore, the time and the condition for controlling the breakage of the grout storing bag can be accurate, the volume and the shape of the pile bottom expansion head can be more accurately mastered, the grouting control process and effect can be controlled, the pile bottom settlement can be effectively eliminated finally, the ultimate bearing capacity of the cast-in-place pile can be greatly improved, and the construction cost can be reduced.
2. According to the pile end bottom grouting device provided by the invention, the slurry storage bag is provided with the weak area, and the bearing strength of the weak area is smaller than that of other parts of the slurry storage bag. When actual grouting is carried out, the weak area is firstly crushed by pressure to form a grout outlet area. So, can set up weak region in the different positions of mud storage bag, or set up weak region into different shapes to satisfy the needs of different construction scenes.
3. The pile end bottom grouting device provided by the invention is designed with a specific one-way valve structure aiming at the condition that a grout outlet is formed in the pipe wall, and comprises a water stop adhesive tape, a hard sheet and a rubber sleeve. When the pressure in the pipe is greater than the ultimate bearing strength of the water-stopping adhesive tape, the water-stopping adhesive tape moves towards the direction far away from the pipe wall under the action of the pressure in the pipe, so that a slurry outlet gap is formed between the water-stopping adhesive tape and the pipe wall, and the pressure in the pipe overcomes the elastic action of the rubber sleeve at the same time, so that the water-stopping adhesive tape is changed into an open state along with the water-stopping adhesive tape to finish slurry outlet; when the pressure in the pipe is less than or equal to the ultimate bearing strength of the water-stopping adhesive tape, the pressure in the pipe is not enough to prop open the water-stopping adhesive tape, the water-stopping adhesive tape is tightly attached to the pipe wall under the elastic action of the rubber sleeve, the rubber sleeve is changed into a sealing state, and the grout outside the pipe can be prevented from flowing back into the pipe under the state, so that the effect of the one-way valve is achieved. In addition, the hard sheet can prevent the damage of the sealing performance caused by the fact that the rubber sleeve is sucked into the pipe through the grout outlet hole due to negative pressure.
4. According to the pile end bottom grouting device provided by the invention, the fixing plate is set as the annular plate, in the process that the whole device sinks along the pile hole, slurry, air and the like in the pile hole can enter the upper part of the pile bottom grouting device through the through hole, a vortex for damaging the hole wall cannot be formed between the pile bottom grouting device and the pile hole, the problem that the vortex for damaging the hole wall cannot be formed in the pile hole due to the fact that the slurry, water and the like cannot be discharged in the descending process is effectively avoided, the problem that slurry water current rotating between the edge of the fixing plate and the pile hole scours and disturbs the hole wall of the pile hole is avoided, the problems of collapse of the hole wall of the pile hole, over standard of sediment at the hole bottom and pile breakage are effectively prevented, and the construction quality and progress of a cast-in-pile body are effectively improved.
5. The cast-in-place pile provided by the invention has the advantages of any one of the above aspects due to the pile end bottom grouting device of any one of the above aspects.
6. The construction method provided by the invention can determine the actual grouting amount and the actual grouting pressure according to the property of the soil and by combining the preset capacity and the preset limit bearing strength of the slurry storage bag, so that the time and the condition for the fracture of the slurry storage bag can be accurately controlled, the shape and the volume of the enlarged head can be further accurately controlled, and the sufficient bearing capacity can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of the pile tip bottom grouting device of the present invention;
FIG. 2 is a schematic view of another embodiment of the pile end bottom grouting device of the present invention;
FIG. 3 is a schematic top view of the pile end bottom grouting apparatus of the present invention;
FIG. 4 is a schematic view of the check valve of the present invention;
FIG. 5 is a schematic structural view of a cast-in-place pile according to the present invention;
FIG. 6 is a schematic view of a slurry filling pipe structure according to the present invention;
fig. 7 is a top view of the polygonal pulp storage bag of the present invention.
Description of reference numerals:
1. a fixing plate; 2. a pulp storage bag; 21. a detection port; 3. a grouting pipe; 31. a first slurry outlet part; 311. a first slurry outlet; 32. an interface; 33. a pulp inlet pipe; 4. a first check valve; 41. a first water-stopping adhesive tape; 42. a first rubber sleeve; 43. a first hard sheet; 5. an annular stopper; 6. a pulp supplementing pipe; 61. a second slurry outlet part; 611. a second slurry outlet; 7. a second one-way valve; 71. a second water-stopping adhesive tape; 72. a second rubber sleeve; 73. a second hard sheet; 8. and (4) a reinforcement cage.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a pile end bottom grouting device, which comprises a fixing plate 1 and a grout storage bag 2 and specifically comprises the following components:
the fixing plate 1 can be made of metal, high-strength plastic plate, hard silica gel or other common materials with hardness meeting the use requirement. The fixing plate 1 can be manufactured by conventional machining or 3D printing and integrally forming. The shape of the fixing plate 1 is not required, and the shape of the fixing plate 1 can be determined according to the cross-sectional shape of the pile hole.
The pulp storage bag 2 is fixed on the fixing plate 1, and the pulp storage bag 2 forms an accommodating cavity suitable for accommodating pulp or the pulp storage bag 2 and the fixing plate 1 enclose an accommodating cavity suitable for accommodating pulp. The pulp storage bag 2 can be a single whole and then fixed on the fixing plate 1; or an open structure and then is connected with the fixing plate 1 in a sealing way to form a containing cavity. The inflated shape of the grout bag 2 may be spherical (as shown in figure 2) or rectangular parallelepiped (as shown in figure 1) or polygonal (as shown in figure 7) or other common shapes, and the inflated shape of the grout bag 2 can be easily determined by those skilled in the art according to the cross-sectional shape of the stake hole. The pulp storage bag 2 may be of a symmetrical or asymmetrical construction. The pulp storage bag 2 can be integrally formed by weaving, spinning, blowing, pressing and the like; or cutting, and molding by sewing or adhesion. The connection of the pulp storage bag 2 to the fixing plate 1 can be made in the following way: a groove is arranged at the edge of the fixing plate 1, a needle hole is arranged in the groove, the edge of the pulp storage bag 2 is arranged in the groove, and the pulp storage bag 2 is bound on the fixing plate 1 by utilizing the groove and the needle hole through a sewing technology; of course, the pulp storage bag 2 and the fastening plate 1 can also be connected by rivets or chemical gluing or other common connecting means. The grout storage bag 2 has an filling state and an internal hollow furling state, wherein grout is filled in the grout storage bag 2 to bear the weight of the pile body, and the grout storage bag 2 is preset with a fixed bearing strength value and has a fixed volume in the filling state. The filling state is the state that the pulp storage bag 2 is filled with pulp and the skin is tight; the furled state is a state in which the inside is not filled with the grout or the inside is not filled with the grout, and the skin is not fully stretched. The volume is fixed in the filling state, namely the pulp storage bag has no elastic expansion amount, and the volume is fixed after the inner pulp is filled, which is mainly compared with the grouting capsule in the prior art, the existing grouting capsule is in the filling state, and the volume is fixed in the filling state of the pulp storage bag 2 in the invention along with the increase of the pressure of the inner pulp. The 'preset fixed bearing strength value' is the bearing strength value when the pulp storage bag 2 is manufactured and is pressed and broken, and the value is a fixed value. The existing grouting capsule has the advantages that the pressure of the existing grouting capsule is increased along with the increase of the internal slurry pressure, the existing grouting capsule is easily interfered by the hole wall of an external pile and the like after expansion, and the pressure-bearing strength value of the existing grouting capsule is not a fixed value when the existing grouting capsule is broken.
The pile end bottom grouting device adopts the grouting storage bag 2 with the unchanged volume in the filling state, and the ultimate bearing strength and the ultimate volume of the grouting storage bag 2 are determined and cannot be changed continuously like the existing grouting capsules, so that the actual grouting pressure and the actual grouting amount can be determined according to the preset ultimate volume and the ultimate bearing strength of the grouting storage bag 2, and the fracture time and the fracture conditions of the grouting storage bag 2 are accurately controlled.
Preferably, the pulp storage bag 2 can be made of chemical synthetic fiber cloth, such as terylene, chinlon, acrylic fiber and the like; or may be made of a plastic film such as polyvinyl chloride, polyethylene, polypropylene, or the like. In particular, the strength of the plastic film and the chemical synthetic fibers is sufficient to satisfy the requirements of the filled concrete slurry, which is the most fundamental condition clear to those skilled in the art. Of course, in other embodiments, the grout bag 2 may be made of other conventional materials, but is suitable for containing concrete grout and has a fixed volume in the inflated state. In particular, the pulp storage bag 2 may be a single layer or a multi-layer structure.
As a further improvement, a weak area is arranged on the pulp storage bag 2, and the pressure-bearing strength of the weak area is smaller than that of other parts of the pulp storage bag 2 so as to form a pulp outlet area when being pressed. The weakened area can be in the shape of a strip or a circle or any other shape, which is determined mainly by the form of the slurry to be sprayed.
Has the following effects: the setting of weak area can be more accurate control in which concrete position of storing thick liquid bag 2 spurts thick liquid to what form spurts thick liquid, has further improved the cracked controllability of storing thick liquid bag 2 like this, can satisfy the needs of multiple different construction scenes.
Of course, in other embodiments, the pulp storage bag 2 may also be uniform, i.e. not provided with weakened areas.
As a further improvement, referring to fig. 1 and 2, the pile tip bottom grouting device further includes:
the grouting pipe 3 is communicated with the inner cavity of the grout storage bag 2 and is suitable for grouting into the grout storage bag 2;
the first one-way valve 4 is arranged at the communication position of the grouting pipe 3 and the pulp storage bag 2 and is suitable for preventing the blockage in the pulp storage bag 2 from entering the grouting pipe 3.
Has the following effects: the setting of first check valve 4 can guarantee the normal output of thick liquid, also can block plugs such as external silt, sediment simultaneously and get into in slip casting pipe 3.
Preferably, referring to fig. 4, a first grout outlet 311 is formed in a wall of the grouting pipe 3, and the first check valve 4 includes:
the first water stop adhesive tape 41 is wound on the part of the grouting pipe 3 provided with the first grout outlet 311;
the first rubber sleeve 42 is directly sleeved outside the first water stopping adhesive tape 41, and the first rubber sleeve 42 is made of rubber or soft silica gel and other elastic materials;
the first water stopping adhesive tape 41 and the first rubber sleeve 42 are in a sealed state of being tightened towards the direction close to the grouting pipe 3 and in an open state of forming a gap with the grouting pipe 3 under the action of the internal pressure of the grouting pipe 3; the first water-stopping adhesive tape 41 clings to the grouting pipe 3 under the tightening action of the first rubber sleeve 42 in a sealed state, a gap is formed between the first water-stopping adhesive tape 41 and the grouting pipe 3 in an opened state, and grout in the grouting pipe 3 can be discharged through the gap;
a first hard sheet 43 sandwiched between the first water stop tape 41 and the first rubber sleeve 42 and disposed corresponding to the first grout outlet 311; the first hard plate 43 is made of metal plate or hard plastic or other hard materials.
Has the following effects: the first water-stopping adhesive tape 41 has a good water-stopping effect, and the sealing performance of the one-way valve can be improved; the first rubber sleeve 42 has better elasticity, so that on one hand, the first water-stopping adhesive tape 41 can be ensured to reset, and on the other hand, enough tightening force can be provided, so that the first water-stopping adhesive tape 41 is ensured to be tightly attached to the pipe wall of the grouting pipe 3 in a sealed state; the first hard sheet 43 has high hardness and can resist negative pressure, and the flexible first rubber sleeve 42 and the first water stop adhesive tape 41 are prevented from being locally sucked into the pipe through the first grout outlet 311 to cause structural damage and sealing performance damage.
As an improved structure of the above technical solution, a layer of rubber sleeve can be additionally arranged between the first water-stopping adhesive tape 41 and the first hard sheet 43, that is, the first rubber sleeve 42 is indirectly sleeved on the first water-stopping adhesive tape 41 through the additionally arranged rubber sleeve, so that compared with the above structure, the first water-stopping adhesive tape 41 is completely contacted with the additionally arranged rubber sleeve, and the locking effect of the rubber sleeve on the first water-stopping adhesive tape 41 is better.
Preferably, referring to fig. 1 to 3, the grout pipe 3 includes:
the first pulp outlet part 31 is positioned in the inner cavity of the pulp storage bag 2; the shape of the first grout outlet part 31 can be determined according to the shape of the grout storage bag 2, for example, if the grout storage bag 2 is of an annular structure, the first grout outlet part 31 is correspondingly set to be an annular tube shape matched with the grout storage bag 2, so that the first grout outlet part can extend to different positions of the grout storage bag 2, and grouting is more uniform;
a port 32 penetrating the fixing plate 1 and communicating with the first slurry outlet 31;
and the slurry inlet pipe 33 is in sealed communication with the interface 32.
The connection between the interface 32 and the slurry inlet pipe 33 can be a threaded connection, a flange connection, a welded connection, a socket connection, or a pipe bonding connection.
Has the following effects: during grouting, grout enters from the grout inlet pipe 33 and reaches the first grout outlet part 31 through the connector 32, so that the grout enters the grout storage bag 2, and grouting is more convenient.
Preferably, referring to fig. 3, the stationary plate 1 is an annular plate, and the pulp storage bag 2 is an annular structure fitted to the annular plate. The "ring shape" herein preferably adopts a circular ring, but is not limited to a circular ring, and the specific shape of the ring shape is determined according to the shape of the pile hole, for example, the pile hole is square, and then a square ring structure is adopted. The "annular" inner hole position preferably adopts a central position coaxial with the annular outer edge, but is not limited to this position, and may be an eccentric arrangement.
Has the following effects: annular fixed plate 1 and storage bag 2 structure for the in-process that pile end bottom slip casting device sinks towards the pile hole bottom, thereby mud water in the pile hole and air etc. can get into the top of pile end bottom slip casting device through annular hole, can not form the vortex that destroys the pore wall between pile end bottom slip casting device and pile hole, and then the effectual pile end bottom slip casting device that has avoided descends the in-process because mud water etc. can't discharge forms the vortex that destroys the pore wall in the pile hole, avoid circling round the mud rivers between fixed plate 1 edge and pile hole and erode and disturb the pore wall, prevent effectively that the pore wall in pile hole from collapsing, the problem that the sediment exceeds standard and the broken pile at the bottom of the hole, the construction quality and the progress of bored concrete pile have been improved effectively.
As a further development, with reference to fig. 1 and 2, the inner circumferential edge of the fastening plate 1 is provided with an annular stop 5 extending to the inner circumference of the pulp storage bag 2. Can be made of metal, high-strength plastic plate, hard silica gel or other common materials with hardness meeting the use requirement. The annular stop member 5 can be fixed on the inner ring edge of the fixing plate 1; or may be formed integrally with the fixing plate 1. When the pulp storage bag 2 is in an open structure, the pulp storage bag 2 can be simultaneously and hermetically connected with the fixed plate 1 and the annular stopper 5 to form a containing cavity. The connection of the pulp storage bag 2 to the annular stop 5 can be made in the following way: the edge of the annular stopper 5 is provided with a groove, a pinhole is arranged in the groove, the edge of the pulp storage bag 2 is arranged in the groove, and the pulp storage bag 2 is bound on the annular stopper 5 by utilizing the groove and the pinhole and adopting a sewing technology; of course, the pulp storage bag 2 and the annular stop 5 can also be connected by means of rivets or chemical gluing or other common connection means.
Has the following effects: in the construction process of bored concrete pile, need to form bored concrete pile to the steel reinforcement cage 8 that installs stake end bottom slip casting device cast-in-place concrete, above-mentioned annular keeps off 5 can form one effectively at the via hole edge and stops the piece with concrete and storage bag 2 are separated to when preventing to cast-in-place concrete in steel reinforcement cage 8, the problem of concrete through 1 hole parcel storage bag 2 of above-mentioned fixed plate, avoid storage bag 2 because of being wrapped up in by the concrete and influence the grouting effect behind the bored concrete pile problem.
As a further improvement, referring to fig. 1 and 2, the pile tip bottom grouting device further includes:
the grout supplementing pipe 6 is communicated with the inner area of the annular stopper 5 and is suitable for injecting grout into the pile hole;
and the second one-way valve 7 is arranged at the communication position of the slurry supplementing pipe 6 and the inner area of the annular stopper 5 and is suitable for preventing the blockage in the pile hole from entering the slurry supplementing pipe 6.
Has the following effects: the grout can be simply and conveniently injected into the inner area of the annular stopper 5 through the grout supplementing pipe 6, so that false points and dry ballast stones formed by concrete segregation at the bottom of the pile due to too large fall are eliminated, and the inner area of the annular stopper 5 is effectively filled, so that the pile bottom strength is enhanced. The setting of second check valve 7 can guarantee the normal output of thick liquid, also can block plugs such as external silt, sediment simultaneously and get into in slip casting pipe 3.
Preferably, referring to fig. 4, a second grout outlet 611 is formed in a pipe wall of the grout adding pipe 6, and the second check valve 7 includes:
the second water-stopping adhesive tape 71 is wound on the part of the pulp supplementing pipe 6, which is provided with a second pulp outlet 611;
the second rubber sleeve 72 is directly sleeved outside the second water stopping adhesive tape 71, and the second rubber sleeve 72 is made of elastic materials such as rubber or soft silica gel;
the second water-stopping adhesive tape 71 and the second adhesive cover 72 are in a sealed state of being tightened towards the direction close to the grout-filling pipe 6 and in an open state of forming a gap with the grout-filling pipe 6 under the action of the internal pressure of the grout-filling pipe 6; the second water-stopping adhesive tape 71 is tightly attached to the grout supplementing pipe 6 under the tightening action of the second rubber sleeve 72 in a sealed state, a gap is formed between the second water-stopping adhesive tape 71 and the grout supplementing pipe 6 in an opened state, and grout in the grout supplementing pipe 6 can be discharged through the gap;
a second hard sheet 73 sandwiched between the second water stop tape 71 and the second rubber sleeve 72 and disposed corresponding to the second grout outlet 611; the first hard plate 43 is made of metal plate or hard plastic or other hard materials.
Has the following effects: the second water-stopping adhesive tape 71 has a good water-stopping effect, and the sealing performance of the one-way valve can be improved; the second rubber sleeve 72 has better elasticity, so that on one hand, the resetting of the second water-stopping adhesive tape 71 can be ensured, and on the other hand, enough tightening force can be provided, so that the second water-stopping adhesive tape 71 is tightly attached to the pipe wall of the grout supplementing pipe 6 in a sealing state; the second hard sheet 73 has high hardness and can resist negative pressure, and the flexible second rubber sleeve 72 and the second water stop adhesive tape 71 are prevented from being locally sucked into the pipe through the second grout outlet hole 611 to cause structural damage and sealing performance damage.
As an improved structure of the above technical solution, a layer of rubber sleeve may be additionally arranged between the second water-stopping tape 71 and the second hard sheet 73, that is, the second rubber sleeve 72 is indirectly sleeved on the second water-stopping tape 71 through the additionally arranged rubber sleeve, so that compared with the above structure, the second water-stopping tape 71 is completely contacted with the additionally arranged rubber sleeve, and the rubber sleeve has a better locking effect on the second water-stopping tape 71.
Preferably, referring to fig. 1 and 2, the slurry supplementing pipe 6 has a second slurry outlet 61 extending to the inner area of the annular stopper 5, and the second slurry outlet 61 is an annular pipeline extending along the inner wall of the annular stopper 5. Of course, in other embodiments, the slurry filling pipe 6 can also be a single pipe structure, as shown in fig. 6; or two tubes or other conceivable alternative configurations.
Has the following effects: the second slurry outlet part 61 is arranged in an annular pipeline, can better adapt to the inner area of the annular stopper 5, and conveys slurry to different positions of the area, so that slurry supplement is more uniform.
As a further improvement of the above technical solution, referring to fig. 1 and 2, the fixing plate 1 is provided with a detection port 21, and the detection port 21 is adapted to fill a medium into the pulp storage bag 2 to verify whether the pulp storage bag 2 leaks and/or can bear the pressure.
Has the following effects: the limit volume and the limit pressure-bearing strength of the pulp storage bag 2 can be obtained through tests by the arrangement of the detection port 21, so that a more accurate preset value can be obtained conveniently, and accurate control of the subsequent construction on the breaking time and conditions of the pulp storage bag 2 is facilitated.
As a further improvement of the above technical solution, the pile tip bottom grouting device further includes:
the safety cover, with the connection can be dismantled to fixed plate 1, and be suitable for to cover before the construction and establish the outside of storing up thick liquid bag 2. The protective cover can be made of aluminum foil, rigid plastic or rigid silica gel and the like, and is mainly used for protecting the slurry storage bag 2 before construction and avoiding colliding and damaging the slurry storage bag 2; during construction, the protective cover needs to be detached from the fixing plate 1.
The invention also provides a cast-in-place pile, which comprises the pile end bottom grouting device and the reinforcement cage 8, wherein the reinforcement cage 8 is connected with the fixing plate 1 of the pile end bottom grouting device, and the concrete is poured into the pile.
During specific implementation, the grout inlet pipe 33 and the grout supplementing pipe 6 can be fixedly connected with the reinforcement cage 8 so as to realize fixation.
In detail, the fixing plate 1, the grouting pipe 3, the annular stopper 5 and the grout pipe 6 in the present invention can be made of high strength plastic. The method can be specifically formed in one step by injection molding or 3D printing.
The cast-in-place pile has the effect of any pile end bottom grouting device as described above due to the pile end bottom grouting device.
The invention also provides a construction method of the cast-in-place pile, which sequentially comprises the following steps:
s1, forming a pile hole, and cleaning sediments in the pile hole;
s2, sinking a reinforcement cage 8 with a pile end bottom grouting device arranged at the lower end to the bottom of the pile hole;
s3, pouring concrete into the pile hole to form a cast-in-place pile;
and S4, grouting into the grout storage bag 2 to form a pile bottom expanded head.
In step S4, control is performed according to the soil properties of the pile hole. If the pile is sandy soil, controlling the actual grouting amount and the grouting pressure to be larger than the preset values of the grout storage bag 2 (the preset values comprise two values, namely a volume value in a filling state of the grout storage bag 2 designed during manufacturing of the grout storage bag 2 and a preset fixed bearing strength value), so that the grout storage bag 2 is broken, cement grout in the grout storage bag 2 overflows, the sandy soil around the bottom of the pile is infiltrated and solidified, and the pile end expanding head and the surrounding stratum are tightly cemented into a whole. If the soil is cohesive soil, controlling the actual grouting amount and the grouting pressure to be smaller than the preset value of the slurry storage bag 2, and avoiding the fracture of the slurry storage bag 2; when the grouting pile is used, the enlarged head formed at the bottom of the pile end is made to be as large as possible through grouting pressure and grouting amount, so that the ultimate bearing capacity of the cast-in-place pile is greatly improved, and settlement is reduced; and then, a grout supplementing pipe 6 in the grouting device can directly perform grouting to the stratum at the bottom of the pile, and at the moment, the formed enlarged head can block grout from returning upwards to promote the grout supplementing to develop to the depth of the stratum, so that the reinforcing range of the foundation at the bottom of the pile is enlarged. Of course, in other embodiments, if the soil is sandy soil, the slurry storage bag 2 can be controlled not to be broken; in case of cohesive soil, the pulp storage bag 2 can also be controlled to break.
Has the following effects: the construction method utilizes the unique pile end bottom grouting device, whether the pile is broken or not and the time and conditions of the breakage can be accurately selected according to different soil properties and preset values of the grout storage bags 2, and therefore the bearing capacity of the cast-in-place pile can be improved adaptively.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (16)
1. A pile end bottom grouting device comprising:
a fixed plate (1);
it is characterized by also comprising:
the grout storage bag (2) is fixed on the fixing plate (1), the grout storage bag (2) forms an accommodating cavity suitable for accommodating grout or the grout storage bag (2) and the fixing plate (1) enclose the accommodating cavity suitable for accommodating grout, the grout storage bag (2) has an inner filling state and an inner hollow furling state, the grout storage bag (2) is preset with a fixed limit pressure-bearing strength value and is fixed in volume under the filling state, and the grout storage bag (2) is filled with grout to bear the pile body.
2. Pile end bottom grouting device according to claim 1, characterised in that the stock bag (2) is made of chemical synthetic fibre cloth or plastic film.
3. Pile end bottom grouting arrangement according to claim 1 or 2, characterised in that the storage bag (2) is provided with weak areas with a lower bearing strength than the rest of the storage bag (2) to create a grout outlet area when pressed.
4. The pile tip bottom grouting device of claim 1, further comprising:
the grouting pipe (3) is communicated with the inner cavity of the grout storage bag (2) and is suitable for grouting into the grout storage bag (2);
the first one-way valve (4) is arranged at the communication position of the grouting pipe (3) and the grout storage bag (2) and is suitable for blocking the blockage in the grout storage bag (2) from entering the grouting pipe (3).
5. The pile end bottom grouting device according to claim 4, characterized in that a first grout outlet (311) is opened on the wall of the grouting pipe (3), and the first check valve (4) comprises:
the first water stopping adhesive tape (41) is wound on the part, provided with the first grout outlet (311), of the grouting pipe (3);
the first rubber sleeve (42) is directly or indirectly sleeved on the outer side of the first water stopping adhesive tape (41);
the first water stop adhesive tape (41) and the first rubber sleeve (42) have a sealing state which is tightened towards the direction close to the grouting pipe (3) and an opening state which forms a gap with the grouting pipe (3) under the action of the internal pressure of the grouting pipe (3);
and the first hard sheet (43) is clamped between the first water stop adhesive tape (41) and the first rubber sleeve (42) and is arranged corresponding to the first slurry outlet hole (311).
6. Pile end bottom grouting device according to claim 4 or 5, characterised in that the grouting pipe (3) comprises:
the first pulp outlet part (31) is positioned in the inner cavity of the pulp storage bag (2);
an interface (32) which passes through the fixing plate (1) and is communicated with the first slurry outlet part (31);
and the slurry inlet pipe (33) is in sealed communication with the interface (32).
7. Pile-end bottom grouting device according to claim 1, characterised in that the fixing plate (1) is an annular plate and the slurry storage bag (2) is of annular construction adapted to the annular plate.
8. Pile-end bottom grouting device according to claim 7, characterised in that the inner ring edge of the fixing plate (1) is provided with an annular stop (5) extending to the inner ring of the grout storage bag (2).
9. The pile tip bottom grouting device of claim 8, further comprising:
the grout supplementing pipe (6) is communicated with the inner area of the annular stopper (5) and is suitable for injecting grout into the pile hole;
and the second one-way valve (7) is arranged at the communication position of the slurry supplementing pipe (6) and the inner area of the annular stopper (5) and is suitable for preventing the blockage in the pile hole from entering the slurry supplementing pipe (6).
10. The pile end bottom grouting device according to claim 9, characterized in that a second grout outlet (611) is opened on the wall of the grout filling pipe (6), and the second check valve (7) comprises:
the second water-stopping adhesive tape (71) is wound on the part, provided with the second slurry outlet hole (611), of the slurry supplementing pipe (6);
the second rubber sleeve (72) is directly or indirectly sleeved on the outer side of the second water stopping adhesive tape (71);
the second water-stopping adhesive tape (71) and the second adhesive sleeve (72) are in a sealed state of being tightened towards the direction close to the pulp supplementing pipe (6) and in an open state of forming a gap with the pulp supplementing pipe (6) under the action of the internal pressure of the pulp supplementing pipe (6);
and the second hard sheet (73) is clamped between the second water stop adhesive tape (71) and the second rubber sleeve (72) and is arranged corresponding to the second slurry outlet hole (611).
11. Pile-end bottom grouting device according to claim 9 or 10, characterised in that the grout pipe (6) has a second grout outlet (61) extending to the inner area of the annular stopper (5), said second grout outlet (61) being an annular pipe extending along the inner wall of the annular stopper (5).
12. The pile-end bottom grouting device according to claim 1, characterized in that a detection port (21) is provided on the fixing plate (1), said detection port (21) being adapted to fill medium into the grout storage bag (2).
13. The pile tip bottom grouting device of claim 1, further comprising:
the protection cover, with fixed plate (1) can be dismantled the connection, and be suitable for to cover before the construction and establish the outside of storing up thick liquid bag (2).
14. An injection pile, comprising:
the pile end bottom grouting device of any one of claims 1 to 13;
and the reinforcement cage (8) is connected with the fixing plate (1) of the pile end bottom grouting device.
15. A method of constructing a cast-in-place pile according to claim 14, comprising the steps of, in order:
s1, forming a pile hole, and cleaning sediments in the pile hole;
s2, sinking a reinforcement cage (8) with the lower end provided with the pile end bottom grouting device to the bottom of the pile hole;
s3, pouring concrete into the pile hole to form a cast-in-place pile;
s4, grouting is conducted into the grout storage bag (2) to form a pile bottom expanded head.
16. The construction method according to claim 15, wherein in step S4, control is performed according to the soil property of the pile hole: if the soil is sandy soil, controlling the actual grouting amount and the grouting pressure to be larger than the preset value of the slurry storage bag (2) so as to break the slurry storage bag (2); and if the soil is cohesive soil, controlling the actual grouting amount and the grouting pressure to be smaller than the preset value of the slurry storage bag (2), and avoiding the fracture of the slurry storage bag (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/094671 WO2023016034A1 (en) | 2021-08-09 | 2022-05-24 | Pile end bottom grouting apparatus, cast-in-place pile and construction method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021109060328 | 2021-08-09 | ||
| CN202110906032 | 2021-08-09 |
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| CN113737786A true CN113737786A (en) | 2021-12-03 |
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| CN202111162217.9A Pending CN113737786A (en) | 2021-08-09 | 2021-09-30 | Pile end bottom grouting device, cast-in-place pile and construction method thereof |
| CN202122409067.9U Active CN218990144U (en) | 2021-08-09 | 2021-09-30 | Pile end bottom grouting device and cast-in-place pile |
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| WO (1) | WO2023016034A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023016034A1 (en) * | 2021-08-09 | 2023-02-16 | 高永光 | Pile end bottom grouting apparatus, cast-in-place pile and construction method therefor |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3688546B2 (en) * | 2000-02-02 | 2005-08-31 | 東日本旅客鉄道株式会社 | Cast-in-place concrete pile construction method and cast-in-place concrete pile bottom ground preloading device |
| JP3880002B2 (en) * | 2004-01-07 | 2007-02-14 | 東日本旅客鉄道株式会社 | Construction method of tip-reinforced cast-in-place concrete pile, injection bag and steel frame |
| JP3926364B2 (en) * | 2004-11-11 | 2007-06-06 | 東日本旅客鉄道株式会社 | Construction method of tip-reinforced cast-in-place piles |
| CN103469792B (en) * | 2013-09-09 | 2015-05-06 | 广东省第二建筑工程公司 | Method for conducting grouting construction at back of pile bottom of cast-in-place pile |
| CN203514303U (en) * | 2013-10-30 | 2014-04-02 | 南京工业大学 | Post-grouting bottom-expanding uplift miniature pile |
| CN106759277A (en) * | 2016-11-16 | 2017-05-31 | 上海市建工设计研究院有限公司 | Grouting device, bottom-enlarging prefabricated pile tube, bottom-enlarging filling pile and its construction method |
| CN107780308A (en) * | 2017-09-27 | 2018-03-09 | 中铁十局集团第三建设有限公司 | A kind of application process of Bag Grouting Pile in Soft Railway |
| CN108411920A (en) * | 2018-01-25 | 2018-08-17 | 天津大学 | A kind of the multiple spot bellows grouting device and its method of control soil deformation |
| CN110896646B (en) * | 2018-12-25 | 2021-04-02 | 高永光 | Pile bottom grouting device and using method thereof, cast-in-place pile body and construction method thereof |
| CN113737786A (en) * | 2021-08-09 | 2021-12-03 | 高永光 | Pile end bottom grouting device, cast-in-place pile and construction method thereof |
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2021
- 2021-09-30 CN CN202111162217.9A patent/CN113737786A/en active Pending
- 2021-09-30 CN CN202122409067.9U patent/CN218990144U/en active Active
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|---|---|---|---|---|
| WO2023016034A1 (en) * | 2021-08-09 | 2023-02-16 | 高永光 | Pile end bottom grouting apparatus, cast-in-place pile and construction method therefor |
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| CN218990144U (en) | 2023-05-09 |
| WO2023016034A1 (en) | 2023-02-16 |
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