CN112323782A - Construction method and structure for forming full casing cast-in-situ bored pile - Google Patents
Construction method and structure for forming full casing cast-in-situ bored pile Download PDFInfo
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
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- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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Abstract
The invention discloses a construction method and a structure for forming a full casing cast-in-situ bored pile, wherein the structure of the cast-in-situ bored pile is mainly obtained by the following construction steps: constructing an orifice stabilizing ring beam; constructing a counterforce system for jacking and pulling up the pile casing; a protective cylinder is arranged on the jacking equipment; drilling holes by a drilling machine; putting down a reinforcement cage, and pouring concrete; and pulling out the protective sleeve by the upward pulling equipment. The full-protection cylinder of the scheme is composed of the segmented protection cylinders which are bolted mutually, and is simple in structure, quick in splicing and dismounting, capable of saving the construction period and high in recycling rate. Through inserting the counter-force pile, pouring counter-force grade beam, can provide the resistance to plucking when the static pressure protects a section of thick bamboo entirely to and pull up the pressure when protecting a section of thick bamboo entirely, can also use as the anchor pile at later stage counter-force pile, the supplementary static load test who accomplishes the pile body. The orifice stabilizing ring beam adopted by the invention not only can accurately position the pile casing and prevent the pile position deviation from being larger due to the deviation of the pile casing, but also can ensure that the pile casing can smoothly enter the hole, thereby reducing the friction force of the downward placement of the pile casing and ensuring the verticality and the stability of the pile casing entering the hole.
Description
Technical Field
The invention relates to the field of pile foundations, in particular to a construction method and a structure for forming a full casing cast-in-situ bored pile.
Background
The cast-in-situ bored pile is a pile formed by forming a pile hole in foundation soil through mechanical drilling, steel pipe soil extrusion or manual excavation and the like on an engineering site, placing a reinforcement cage in the pile hole and pouring concrete into the pile hole. The construction process is mature, the bearing capacity is high, and the application range is wide, so that the construction process is widely applied to structural engineering foundations of roads, railway bridges and the like. The construction of cast-in-situ bored pile includes two kinds of wall protecting slurry method and full casing construction method. The construction of the full-protection-cylinder bored pile is characterized in that a steel protection cylinder overcomes the friction between the soil layer and the protection cylinder by using special shaking and vibrating equipment, the protection cylinder penetrates through the unfavorable stratum in the drilling construction of the pile machine until a stable pile end bearing layer is reached, and the slag soil in the protection cylinder is hollowed by using the drilling equipment, so that the construction technology of the cast-in-place pile is ensured; meanwhile, under geological conditions such as a loose sand layer, a fine-angle gravel layer, a quicksand layer, a thick silt layer, a karst landform and the like, mud wall protection is carried out, and the stability of the hole wall is difficult to ensure, so that a full-protection-barrel construction technology is required under the conditions.
In the existing full pile casing construction technology, the subsection pile casing is generally welded, the welding time is long, the construction progress is influenced, the verticality of the pressed pile casing is difficult to guarantee, the verticality of the pressed pile casing needs to be checked by a level gauge and a plumb at any time, and time and labor are wasted.
Therefore, at present, a pile-forming structure of a full casing cast-in-situ bored pile with a reaction system and a construction method thereof, which can be quickly constructed and ensure verticality, are urgently needed to be sought.
Disclosure of Invention
Based on this, the application provides a construction method and structure that a full pile casing drilling bored concrete pile becomes stake for solve the welding time that has the segmentation to protect a section of thick bamboo among the correlation technique longer, influence the construction progress, and be difficult to guarantee to impress the straightness's that hangs down who protects a section of thick bamboo problem, this construction structure not only the construction is swift, guarantees the straightness that hangs down, and through counter-force pile and counter-force grade beam, lets mechanical equipment more firm on the equipment fixed beam, has increased the holistic anti-buoyancy of structure.
The application provides a construction method for forming a full casing cast-in-situ bored pile, which comprises the following construction steps:
firstly, digging and drilling a hole pit with a diameter larger than that of a full pile casing according to design, and pouring an orifice stabilizing ring beam outside the hole pit, wherein the full pile casing is formed by connecting at least two sections of segmented pile casings;
step two, respectively driving reaction piles at two sides of the orifice stabilizing ring beam, pouring a reaction ground beam at the top of each reaction pile, and installing an equipment fixing beam on each reaction ground beam, wherein the reaction piles, the reaction ground beams and the equipment fixing beams form a reaction structure of jacking and upward shifting of the full casing;
thirdly, jacking equipment is arranged on the equipment fixing beam, the prefabricated segmented pile casing is transported to a construction site, after the first segmented pile casing is lifted to enter the hole to stabilize the ring beam, the ring beam is vertically and downwards arranged through the jacking equipment, the other segmented pile casing is connected with the first segmented pile casing, and the ring beam is vertically and downwards arranged through the jacking equipment until the bottom of the pile casing reaches a hard layer with the designed depth;
removing jacking equipment, digging and drilling in the full pile casing to the designed pile hole depth, and putting the reinforcement cage manufactured in advance into the pile hole for concrete pouring;
and step five, after pouring, arranging pulling-up equipment on the equipment fixing beam, pulling out the full casing section by section from the pile hole, and recycling the recovered section casing.
In one possible implementation, in step five, the method includes: and after the pile forming maintenance of the full pile casing cast-in-situ bored pile is completed, and a static load test is carried out, dismantling the counterforce ground beam and the counterforce pile on the ground.
In one possible implementation, in step one, excavating and drilling a hole pit larger than the full casing diameter according to the design comprises:
the construction position of the cast-in-place pile is determined through paying off and positioning, the drilling machine is kept stable, the drill point of the rotary drilling machine is aligned to the center of the pile position, and a hole pit larger than the diameter of the full pile casing is dug.
In one possible implementation, in step one, the depth of the hole pit is 3-10 m.
In a possible implementation manner, in the second step, the reaction pile includes two concrete precast piles which are respectively arranged on two sides of the orifice-stabilizing ring beam in a driving manner, the reaction ground beam is poured at the top of the reaction pile, foundation bolts are embedded in the reaction ground beam, and the equipment fixing beam is fixed at two ends of the reaction ground beam in a crossing manner through the foundation bolts.
In a possible implementation mode, in the third step, the adjacent segmented pile casings are bolted through the connecting steel plates and the high-strength bolts, and the annular cutting tool bit is installed at the extending end of the segmented pile casing with the first segment extending into the soil layer, so that the downward resistance of the full pile casing is reduced.
In one possible implementation, in step three, a sealing collar is installed between adjacent segmented casings.
In one possible implementation mode, the segmented casing is composed of an inner steel pipe and a T-shaped steel arranged on the outer side of the steel pipe, the T-shaped steel is provided with a bolt hole, and a high-strength bolt penetrates through the bolt hole in the T-shaped steel and is connected with a steel plate to connect the segmented casing.
In a possible implementation mode, the orifice stabilizing ring beam is of a reinforced concrete cylindrical structure, the inner wall of the orifice stabilizing ring beam is provided with grooves, and the shapes and the number of the grooves are matched with those of the T-shaped steel and used for inserting T-shaped steel flanges for inserting the segmented pile casings.
In a second aspect, the application provides a pile-forming structure of a full pile casing cast-in-situ pile, which is obtained by the construction method of the pile-forming structure of the full pile casing cast-in-situ pile.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
1. the invention adopts a pile-forming structure system of the full pile casing cast-in-situ pile, wherein the full pile casing is composed of the subsection pile casings which are bolted mutually, the structure is simple, the splicing and the dismounting are rapid, the construction period is saved, and the recycling rate is high.
2. The anti-floating pile is provided with a jacking and upward-pulling counter-force system of the pile casing, so that the anti-floating force of the whole structure is increased, particularly, when the anti-floating pile is constructed at a water seepage position, a soil layer is subjected to the buoyancy of water, the construction structure and construction equipment are easy to cause instability after installation, the anti-pulling force during static pressure full pile casing and the pressure during upward pulling of the full pile casing can be provided by inserting the counter-force pile and pouring the counter-force ground beam, the counter-force pile can be used as an anchor pile at the later stage, and the static load test of a pile body is assisted to be completed.
3. The orifice stabilizing ring beam adopted by the invention not only can accurately position the pile casing and prevent the pile position deviation from being larger due to the deviation of the pile casing, but also can ensure that the pile casing can be smoothly inserted into the hole, thereby reducing the friction force of the downward placement of the pile casing, ensuring the verticality and the stability of the hole of the pile casing, reducing the insertion time of the full pile casing and ensuring the smooth insertion of the full pile casing.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in related arts, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a construction step diagram of a pile-forming system of a full casing cast-in-situ bored pile;
FIG. 2 is a schematic view of the construction of jacking and pulling up the casing;
FIG. 3 is a schematic view of a layout of the counterforce system;
FIG. 4 is a plan view of FIG. 3;
FIG. 5 is a schematic illustration of the connection of the segmented casing;
FIG. 6 is a plan view of a segmented casing;
fig. 7 is a schematic view of a segmented casing inserted into an orifice stabilizing collar.
Wherein: 1-equipment fixing beam; 2-counterforce ground beam; 3-foundation bolts; 4-mechanical equipment; 5-fastening bolts; 6-an orifice stabilizing ring beam; 7-counterforce piles; 8-high strength bolts; 9-connecting steel plates; 10-a sealing collar; 11-a segmented casing; 12-a ring-shaped cutting bit; 13-T section steel; 14-a steel cylinder; 15-bolt holes; 16-groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other examples, which can be obtained by a person skilled in the art without making any inventive step based on the examples in this application, are within the scope of protection of this application.
It is obvious that the drawings in the following description are only examples or embodiments of the application, from which the application can also be applied to other similar scenarios without inventive effort for a person skilled in the art. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Unless otherwise defined, technical or scientific terms used in the claims and the specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing and claiming the application are not to be construed as limiting in any way, but rather as indicating the singular or plural. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalent, and does not exclude other elements or items. "connected" or "coupled" and similar terms are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in the specification and claims of this application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
The detailed structural processing and other construction technical requirements in the embodiments of the present invention are not repeated, the embodiments of the present invention are mainly explained, and the present invention is further described in detail by embodiments with reference to the drawings, and the description is not limited to the following embodiments.
Fig. 1 is a construction step diagram of a pile-forming system of a full casing cast-in-situ bored pile, and in fig. 1, the structure of the cast-in-situ bored pile is mainly constructed by the following construction steps: constructing an orifice stabilizing ring beam 6; constructing a counterforce system for jacking and pulling up the pile casing; a protective cylinder is arranged on the jacking equipment; drilling holes by a drilling machine; putting down a reinforcement cage, and pouring concrete; and pulling out the protective sleeve by the upward pulling equipment.
The embodiment of the application provides a protect a section of thick bamboo bored concrete pile structure entirely, including protecting a section of thick bamboo entirely, wherein, protect a section of thick bamboo entirely and protect a section of thick bamboo 11 by at least two segmentation and indulge to spread range upon range of, can dismantle and connect and form, it establishes position department and is equipped with drill way firm gird 6 to protect a section of thick bamboo entirely, protect a section of thick bamboo entirely and set up in drill way firm gird 6, the reaction pile 7 is established to the both sides of drill way firm gird 6, the top of reaction pile 7 is equipped with reaction grade beam 2, install the equipment fixing beam 1 that is used for fixed mechanical equipment 4 on the reaction.
In this embodiment, the full-protection casing is formed by connecting a plurality of sections of sectional protection casings 11 up and down, and the detachable connection mode not only reduces the installation time, but also can recycle the recovered sectional protection casings 11.
In some embodiments, the adjacent segmented casing 11 is bolted through the connecting steel plate 9 and the high-strength bolt 8, and the annular cutting tool bit 12 is installed at the extending end of the segmented casing 11 with the first segment extending into the soil layer, so that the downward falling resistance of the full casing is reduced, and the downward falling speed of the full casing is increased.
In some of these embodiments, a sealing collar 10 is provided between adjacent segmented casings 11.
In this embodiment, sealed processing has been done to the kneck, can play water-proof effects to protecting a section of thick bamboo inside.
In some embodiments, the reaction pile 7 comprises two precast concrete piles which are driven on two sides of the orifice stabilizing ring beam 6, the reaction floor beam 2 is poured on the top of the reaction pile 7, the anchor bolts 3 are embedded in the reaction floor beam 2, and the equipment fixing beam 1 is fixed on two ends of the reaction floor beam 2 in a crossing manner through the anchor bolts 3.
In this embodiment, the precast concrete pile is beaten and is established four, not only can provide the resistance to plucking when the section of thick bamboo is protected entirely to static pressure to and pull up the pressure when protecting entirely, in the later stage, precast concrete pile can make the anchor pile use, supplementary completion pile body's static load test. Specifically, when the full-protection casing is constructed at a water seepage position, the soil layer is subjected to buoyancy of water, so that the construction structure and construction equipment are easy to be instable after installation, the mechanical equipment 4 is more stable by arranging the counter-force structure, the integral anti-buoyancy of the structure is increased, and the full-protection casing is not easy to move. When a static load test is carried out, an oil jack is placed on an equipment fixing beam 1 on the upper portion around a cast-in-place pile, an observation system is installed, a full-automatic oil pump is installed, pressure sensors are connected in parallel to an oil supply pipe of the electric oil pump, two displacement sensors are symmetrically installed on two sides of a bearing plate, and a receiver is perpendicular to the bearing plate and connected to a static load tester. Collecting data, starting a test, collecting the data, analyzing the data and giving a test report.
In some of these embodiments, the inner diameter of the aperture stabilizing ring 6 is larger than the outer diameter of the full casing, and when the full casing enters the aperture stabilizing ring 6, the aperture stabilizing ring 6 positions the full casing in the armed position.
In the embodiment, a hole pit with a diameter larger than that of the full casing is dug and drilled according to the design, the orifice stabilizing ring beam 6 is poured outside the hole pit, and the depth of the hole pit is 3-10m, and can be 5m or 6m as an example. The inner diameter of the orifice stabilizing ring beam 6 is larger than the outer diameter of the full-protection cylinder, so that the full-protection cylinder can be smoothly inserted into the orifice when being transferred, and the friction force of the full-protection cylinder during transferring is reduced.
In some embodiments, the segmented casing 11 is composed of an inner steel pipe and a T-shaped steel 13 arranged on the outer side of the steel pipe, the T-shaped steel 13 is provided with a bolt hole 15, and the high-strength bolt 8 penetrates through the bolt hole 15 on the T-shaped steel 13 and the connecting steel plate 9 to fix the segmented casing 11.
In this embodiment, the T-shaped steels 13 passing through the upper and lower segmented casings 11 are joined and fixed by the tie steel plates 9 and the high-strength bolts. T shaped steel 13 is equipped with bolt hole 15, corresponds on the connecting plate 9 and sets up the hole, and high strength bolt passes T shaped steel 13 and connecting plate 9, screws up the back, and upper and lower segmentation protects a section of thick bamboo 11 and connects. And a sealing lantern ring 10 is arranged between the sectional protective cylinders 11, then the sectional protective cylinders are continuously vertically downwards arranged, and after the connected sectional protective cylinders 11 are arranged to a certain depth, the other sectional protective cylinder 11 is connected with the sectional protective cylinders.
In one embodiment, the T-shaped steel 13 is disposed at the end of the steel pipe, and the T-shaped steel 13 is uniformly disposed on the outer side wall of the steel pipe with the steel pipe as the axis.
In the present embodiment, referring to fig. 5 to 6, a set of T-shaped steels 13 is respectively disposed at the upper part and the lower part of each segmented casing 11, and each set of T-shaped steels 13 is symmetrically arranged in four equal parts.
In one embodiment, the orifice stabilizing ring beam 6 is of a reinforced concrete cylindrical structure, the inner wall of the orifice stabilizing ring beam 6 is provided with grooves 16, and the shape and the number of the grooves 16 are matched with those of the T-shaped steel 13 and are used for inserting flanges of the T-shaped steel 13 of the segmented pile casing 11.
In this embodiment, the aperture-fixing ring beam 6 is used to accurately position the segmented pile casing 11, so as to prevent the pile position deviation caused by the deviation of the segmented pile casing 11 from being large, and each segmented pile casing 11 is placed down in the aperture-fixing ring beam 6, so that the inner wall of the aperture-fixing ring beam 6 is provided with a groove 16 matched with the outer edge shape of the segmented pile casing 11.
In one embodiment, the mechanical device 4 comprises a pressing device for setting the casing and a pulling device for pulling out the casing.
Specifically, the drill bit can be selected as the drill hole of the drilling machine to be 800mm, the depth of the guide hole, namely the hole depth, is 5m or 6m, and the guide hole can enable the sectional protection cylinder 11 to be accurately positioned, so that the deviation of the sectional protection cylinder 11 is prevented from being very large. The jacking device can be a hydraulic vibration hammer, and when the segmented casing 11 cannot sink due to self weight, the segmented casing 11 is beaten by the hydraulic vibration hammer. The pulling-up equipment can be a rotary drilling rig or a pulling-up structure consisting of a clamping assembly, a remote control assembly and a power assembly for providing power. The pile casing is arranged and pulled out through the mechanical equipment 4, the perpendicularity of the pile casing can be guaranteed, and the pile body is prevented from being clamped locally due to the change of the perpendicularity of the pile casing.
To sum up, this scheme provides a protect a section of thick bamboo bored concrete pile structure entirely, and the section of thick bamboo that protects entirely of this scheme is protected by each other bolt-connected segmentation and protects a section of thick bamboo 11 to constitute, simple structure, and concatenation and dismouting are swift, practice thrift the time limit for a project and recycle rate is high. Specifically, a jacking and upward pulling counter-force system is arranged on the periphery of the segmented pile casing 11, so that the buoyancy resistance of the whole structure is increased, the anti-pulling force during static pressure full pile casing and the pressure during upward pulling full pile casing can be provided by inserting the counter-force pile 7 and pouring the counter-force ground beam 2, the counter-force pile 7 can also be used as an anchor pile in the later period, and the static load test of the pile body is completed in an auxiliary manner. The orifice stabilizing ring beam 6 adopted by the invention not only can accurately position the pile casing and prevent the pile position deviation from being larger due to the deviation of the pile casing, but also can ensure that the pile casing can be smoothly inserted into the hole, thereby reducing the friction force of the downward placement of the pile casing, ensuring the verticality and the stability of the hole of the pile casing, reducing the insertion time of the full pile casing and ensuring the smooth insertion of the full pile casing. By the aid of the method, the problems that welding time of the segmented pile casing 11 is long, construction progress is influenced, and perpendicularity of the pressed pile casing is difficult to guarantee in the related art can be effectively solved.
Based on the same conception, the construction steps of the invention are as follows:
firstly, digging and drilling a hole pit with a diameter larger than that of a full pile casing according to design, and pouring an orifice stabilizing ring beam 6 outside the hole pit, wherein the full pile casing is formed by connecting at least two sections of segmented pile casings 11;
step two, driving reaction piles 7 on two sides of the orifice stabilizing ring beam 6, pouring a reaction ground beam 2 on the top of each reaction pile 7, and installing an equipment fixing beam 1 on each reaction ground beam 2, wherein the reaction piles 7, the reaction ground beams 2 and the equipment fixing beams 1 form a reaction structure of full pile casing jacking and upward shifting;
thirdly, arranging jacking equipment on the equipment fixing beam 1, bolting the jacking equipment on the equipment fixing beam through a fastening bolt 5, transporting the prefabricated segmented pile casing 11 to a construction site, hoisting the first segmented pile casing 11 to enter the hole to stabilize the ring beam 6, vertically and downwards arranging the jacking equipment, connecting the other segmented pile casing 11 with the first segmented pile casing 11, and vertically and downwards arranging the jacking equipment until the bottom of the steel cylinder 14 reaches a hard layer with a designed depth;
removing jacking equipment, digging and drilling in the full pile casing to the designed pile hole depth, and putting the reinforcement cage manufactured in advance into the pile hole for concrete pouring;
and step five, after pouring, arranging pulling-up equipment on the equipment fixing beam 1, pulling out the full casing section by section from the pile hole, and recycling the recovered sectional casing 11.
In the first step, the construction position of the cast-in-place pile is determined through paying off and positioning, after the drilling machine is in place, the drilling machine is kept stable, the drill point of the rotary drilling machine is aligned to the center of the pile position, and a hole pit with the diameter larger than that of the pile casing is drilled and dug, wherein the depth of the hole pit is 5 m.
In the second step, after the orifice stabilizing ring beam 6 is maintained, the reaction pile 7 is driven, the reaction ground beam 2 is poured on the top of the reaction pile 7, the foundation bolts 3 are embedded on the reaction ground beam 2, the equipment fixing beam 1 is fixed at two ends of the reaction ground beam 2 in a stretching mode through the foundation bolts 3, and finally the reaction system of jacking and upward pulling of the pile casing is formed.
In the third step, a jacking device is bolted and mounted on the device fixing beam 1, the segmented pile casing 11 which is manufactured in advance is transported to a construction site, the lower end of the first segmented pile casing 11 is connected with an annular cutting tool bit 12, the hole opening stabilizing ring beam 6 is hoisted and vertically downwards arranged through the jacking device, after the pile casing is arranged to a certain depth, the upper segmented pile casing 11 and the lower segmented pile casing 11 are bolted through T-shaped steel 13 and connecting steel plates 9, a sealing sleeve ring 10 is arranged between the segmented pile casings 11, and then the pile casing is continuously vertically downwards arranged until the bottom of the pile casing reaches a hard layer with a designed depth.
And in the fourth step, after the pile casing reaches the preset depth, removing the jacking equipment, putting the pore-forming drilling machine in place again, drilling by using a drill bit to the required pile hole depth and cleaning the hole, then putting the reinforcement cage manufactured in advance into the pile hole, and pouring concrete in time, wherein the concrete can be poured by using an automobile pump and combining an underwater concrete pouring construction process.
And in the fifth step, after the concrete pouring meets the requirements, the pulling-up equipment is bolted and installed on the equipment fixing beam 1.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A construction method for forming a full casing cast-in-situ bored pile is characterized by comprising the following construction steps:
firstly, digging and drilling a hole pit with a diameter larger than that of a full pile casing according to design, and pouring an orifice stabilizing ring beam (6) outside the hole pit, wherein the full pile casing is formed by connecting at least two sections of segmented pile casings (11);
secondly, driving reaction piles (7) at two sides of the orifice stabilizing ring beam (6), pouring a reaction ground beam (2) at the top of each reaction pile (7), and installing an equipment fixing beam (1) on each reaction ground beam (2), wherein the reaction piles (7), the reaction ground beams (2) and the equipment fixing beams (1) form a reaction structure of full pile casing jacking and upward shifting;
thirdly, jacking equipment is arranged on the equipment fixing beam (1), the prefabricated segmented pile casing (11) is transported to a construction site, after the first segmented pile casing (11) is lifted to enter the hole to stabilize the ring beam (6), the other segmented pile casing (11) is vertically and downwards arranged through the jacking equipment, the other segmented pile casing (11) is connected with the first segmented pile casing (11), and the other segmented pile casing is vertically and downwards arranged through the jacking equipment until the bottom of the pile casing reaches a hard layer with a designed depth;
removing jacking equipment, digging and drilling in the full pile casing to the designed pile hole depth, and putting the reinforcement cage manufactured in advance into the pile hole for concrete pouring;
and fifthly, after pouring, the equipment fixing beam (1) is provided with pulling-up equipment, the whole pile casing is pulled out of the pile hole in a segmented manner, and the recovered segmented pile casing (11) is recycled.
2. The construction method of the pile of the full casing cast-in-situ pile as claimed in claim 1, wherein in step five, the method comprises: after the pile-forming maintenance of the full pile casing cast-in-situ bored pile is completed, and a static load test is carried out, the counterforce ground beam (2) and the counterforce pile (7) on the ground are removed.
3. The construction method for forming the pile by the full casing cast-in-situ pile as claimed in claim 1, wherein in the step one, digging and drilling the hole pit larger than the full casing diameter according to the design comprises:
the construction position of the cast-in-place pile is determined through paying off and positioning, the drilling machine is kept stable, the drill point of the rotary drilling machine is aligned to the center of the pile position, and a hole pit larger than the diameter of the full pile casing is dug.
4. The construction method of the pile of the full casing cast-in-situ bored pile according to claim 1, wherein in the first step, the depth of the hole pit is 3 to 10 m.
5. The construction method of the pile-forming of the full-casing cast-in-situ bored pile according to claim 1, wherein in the second step, the reaction pile (7) comprises two precast concrete piles which are respectively arranged on two sides of the orifice stabilizing ring beam (6), the reaction ground beam (2) is poured on the top of the reaction pile (7), the foundation bolts (3) are embedded in the reaction ground beam (2), and the equipment fixing beam (1) is fixed on two ends of the reaction ground beam (2) in a crossing manner through the foundation bolts (3).
6. The construction method of the full casing bored pile according to claim 1, characterized in that in step three, the adjacent segmented casing (11) is bolted through the connecting steel plate (9) and the high-strength bolt (8), and the annular cutting head (12) is installed at the extending end of the segmented casing (11) with the first section extending into the soil layer, so as to reduce the resistance of the full casing lowering.
7. The construction method of the pile forming of the full casing cast-in-situ pile is characterized in that in the third step, a sealing sleeve ring (10) is installed between the adjacent segmented casings (11).
8. The construction method of the full pile casing bored pile forming according to claim 1, characterized in that the segmental pile casing (11) is composed of a steel pipe inside and a T-section steel (13) arranged outside the steel pipe, the T-section steel (13) is provided with bolt holes (15), and the high-strength bolts (8) are passed through the bolt holes (15) on the T-section steel (13) and the connecting steel plate (9) to connect the segmental pile casing (11).
9. The construction method of the full pile casing cast-in-situ pile forming according to the claim 1, characterized in that the orifice stabilizing ring beam (6) is a reinforced concrete cylinder structure, the inner wall of the orifice stabilizing ring beam (6) is provided with grooves (16), the shape and the number of the grooves (16) are matched with the shape and the number of the T-shaped steel (13) and are used for inserting the flange of the T-shaped steel (13) of the sectional pile casing (11).
10. A pile-forming structure of a full pile casing cast-in-situ bored pile is characterized by being obtained by the construction method of the pile-forming structure of the full pile casing cast-in-situ bored pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN114753361A (en) * | 2022-04-29 | 2022-07-15 | 深圳市交通公用设施建设中心 | Pile foundation steel casing capable of controlling stratum deformation and construction method thereof |
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| CN114753361A (en) * | 2022-04-29 | 2022-07-15 | 深圳市交通公用设施建设中心 | Pile foundation steel casing capable of controlling stratum deformation and construction method thereof |
| CN114753361B (en) * | 2022-04-29 | 2024-04-30 | 深圳市交通公用设施建设中心 | Pile foundation steel pile casing capable of controlling stratum deformation and construction method thereof |
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