CN109706921B - Construction process for double pile casings of cast-in-place pile - Google Patents
Construction process for double pile casings of cast-in-place pile Download PDFInfo
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- CN109706921B CN109706921B CN201910087227.7A CN201910087227A CN109706921B CN 109706921 B CN109706921 B CN 109706921B CN 201910087227 A CN201910087227 A CN 201910087227A CN 109706921 B CN109706921 B CN 109706921B
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Abstract
The invention discloses a construction process of a double pile casing of a cast-in-place pile, which comprises the following steps: step one, installing an outer protective cylinder, wherein the lower end of the outer protective cylinder is positioned at 4-5 m of a sand layer; step two, coaxially installing an inner casing in the outer casing, wherein the lower end of the inner casing is located at 2-3 m of the medium hard rock stratum; pouring mortar into the inner protective cylinder, tamping and standing to obtain a mortar layer, wherein the height of the mortar layer is 1-2 m; drilling continuously through the mortar layer until a hole is formed; after the outer protective cylinder is installed, carrying out wall protection treatment on the outer protective cylinder, wherein the specific method for wall protection treatment comprises the following steps: removing the drilling slag and the seawater in the outer protective cylinder, then adding fresh water into the outer protective cylinder, adding bentonite with the weight 0.2 times of the total weight of the fresh water, and stirring until the bentonite and the fresh water are uniformly mixed. The invention effectively relieves the problem of slurry leakage of the protecting cylinder by arranging the inner protecting cylinder and the outer protecting cylinder, and further improves the slurry leakage prevention effect by pouring the mortar into the inner protecting cylinder.
Description
Technical Field
The invention relates to the technical field of cast-in-place pile construction. More particularly, the invention relates to a construction process of a double pile casing of a shallow-covering-layer cast-in-place pile.
Background
Along with the advance of the urbanization process of China, the requirements of coastal region ports and highway bridge construction are increasing day by day. At present, the construction of the water cast-in-place pile generally adopts a steel casing construction process, but if the covering layer of a construction part is shallow, the depth of the steel casing into the soil is not enough, and slurry leakage is easily caused.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide a construction process of the double pile casings of the cast-in-place pile, which effectively relieves the problem of slurry leakage of the pile casings by arranging the inner pile casing and the outer pile casing, and further improves the slurry leakage prevention effect by pouring mortar into the inner pile casing.
To achieve these objects and other advantages in accordance with the present invention, there is provided a cast-in-place pile double casing construction process, comprising the steps of:
step one, installing an outer protective cylinder, wherein the lower end of the outer protective cylinder is positioned at 4-5 m of a sand layer;
step two, coaxially installing an inner casing in the outer casing, wherein the lower end of the inner casing is located at 2-3 m of the medium hard rock stratum;
pouring mortar into the inner protective cylinder, tamping and standing to obtain a mortar layer, wherein the height of the mortar layer is 1-2 m;
and step four, drilling continuously through the mortar layer until a hole is formed.
Preferably, after the outer protective cylinder is installed, the outer protective cylinder is subjected to wall protection treatment, and the specific method of the wall protection treatment is as follows: removing the drilling slag and the seawater in the outer protective cylinder, then adding fresh water into the outer protective cylinder, adding bentonite with the weight 0.2 times of the total weight of the fresh water, and stirring until the bentonite and the fresh water are uniformly mixed.
Preferably, the inner and outer sheaths are filled with clay.
Preferably, the hole cleaning treatment is carried out after the hole is formed, and the hole cleaning treatment specifically comprises the following steps:
s1, primary hole cleaning: cleaning the hole for the first time by using a slurry pump pipe;
s2, secondary hole cleaning: and installing a reinforcement cage and a concrete pouring guide pipe in the formed hole, and circularly cleaning the hole by using the concrete pouring guide pipe.
Preferably, the cast-in-place pile is formed by using concrete after the hole is formed and cleaned.
Preferably, the inner casing and the outer casing are both composed of a plurality of sections of steel casings, wherein:
arbitrary two adjacent sections steel protect the steel that lies in the top in the section of thick bamboo and protect a bottom rigid coupling cylindric location section of thick bamboo, the internal diameter of a location section of thick bamboo is greater than the steel protects an internal diameter, the external diameter of a section of thick bamboo and is less than the steel protects the external diameter of a section of thick bamboo, the steel protects a position the bottom of a location section of thick bamboo both sides is sunken respectively and is formed two annular spouts, two spouts all with the steel protects a coaxial setting, follows in two spouts a steel protects a circumference interval and is equipped with multiunit drive assembly jointly, be equipped with the fixed subassembly of multiunit along its circumference interval in the location section of thick bamboo, multiunit drive assembly and multiunit locating component one-to-one setting:
each group of driving assemblies comprises two driving blocks which are respectively sealed and arranged in the two sliding chutes in a sliding manner up and down in a one-to-one correspondence manner, through holes used for communicating the two sliding chutes, and two fixed pulleys which are respectively fixedly arranged at the bottoms of the two sliding chutes in a one-to-one correspondence manner, wherein the end parts of the driving blocks are fixedly provided with first springs, the free ends of the first springs are fixedly connected with the bottom ends of the sliding chutes corresponding to the first springs, and the upper ends of the through holes are flush with the bottom ends of the;
each group of fixed components comprises a plurality of sliding cavities which are arranged by penetrating through the side wall of the positioning cylinder, the sliding cavities are arranged at intervals from top to bottom, two sliding blocks are arranged in each sliding cavity in a sliding mode, a second spring is connected between the two sliding blocks positioned at the lowest part, any two adjacent sliding cavities are communicated with a sliding hole, a connecting rod is arranged in each sliding hole in a sliding mode, the upper end of each connecting rod is connected with the sliding block positioned above the connecting rod, the lower end of each connecting rod is connected with the sliding block positioned below the connecting rod, a threading hole is arranged between the sliding cavity positioned at the lowest part and the threading hole in a penetrating mode, a first steel wire rope is fixedly arranged at the end part of each two sliding blocks positioned at the lowest part, a second steel wire rope is fixedly arranged in the middle of each first steel wire rope, the free end of each second steel wire rope penetrates through the threading hole and is connected with a third steel, in the same fixed assembly, the vertical lengths of the sliding blocks are sequentially increased from top to bottom;
the top end of the steel pile casing below any two adjacent sections of steel pile casings is sunken downwards to form an annular fixing groove, the fixing groove and the steel pile casings are coaxially arranged, a plurality of groups of containing assemblies are arranged in the fixing groove at intervals along the circumferential direction of the fixing groove, the plurality of groups of containing assemblies and the plurality of groups of fixing assemblies are arranged in a one-to-one correspondence manner, each group of containing assemblies comprises a plurality of pairs of containing grooves formed by the interval sunken part of the side wall of the fixing groove, the plurality of pairs of containing grooves are arranged at intervals up and down, two containing grooves in each pair of containing grooves are respectively positioned on two side walls of the fixing groove to respectively contain two sliding blocks in the same sliding cavity, the bottom end of each containing groove in the pair of containing grooves at the lowest position is provided with a mounting hole in a penetrating manner, a push rod is detachably connected in the mounting hole, wherein annular positioning blocks, the fixing groove is matched with the positioning part, and the end part of the mounting hole, which is far away from the fixing groove corresponding to the mounting hole, is provided with a sealing cover;
the depth of the fixed groove is 1/8 of the length of the steel casing, the upper end of the positioning block is covered with a first sealing sheet, the end part of the driving block far away from the first spring is covered with a second sealing sheet, and any two adjacent sections of steel casing are connected before: the driving block partially protrudes out of the sliding groove, the sliding blocks are respectively positioned in the corresponding sliding cavities, the second spring contracts, the push rod is separated from the mounting hole, and when any two sections of steel casing are connected: the locating piece is located in the spout, the slider one-to-one is located in the holding tank, the bottom that the steel that is located the top protects a section of thick bamboo and the top butt that is located the below steel and protects a section of thick bamboo, the bottom that the steel that is located the top protects a section of thick bamboo of location and the low side butt that is located the fixed slot in the below steel protects a section of thick bamboo.
The invention at least comprises the following beneficial effects:
firstly, the mortar leakage of the side walls of the inner pile casing and the outer pile casing can be effectively reduced through the combined use of the inner pile casing and the inner pile casing, and the mortar can be filled in a hard rock stratum at the bottom of a hole and the mortar leakage of the bottom of the inner pile casing can be reduced through the grouting and tamping of the mortar in the inner pile casing, so that the collapse of a circumferential sand layer and the middle hard rock stratum of the inner pile casing and the outer pile casing can be avoided, and the normal construction of a cast pile can be ensured.
Secondly, the steel casing designed by the invention has a positioning effect on the upper section of steel casing and the lower section of steel casing, so that the upper section of steel casing and the lower section of steel casing are effectively prevented from deviating in the installation process, and the installation accuracy of the steel casing is improved.
Thirdly, the positioning cylinder is positioned in the fixing groove, so that dislocation of an upper steel casing and a lower steel casing is effectively avoided, slurry leakage at a joint can be effectively avoided, and meanwhile, the sealing performance of the joint can be further improved and slurry leakage is reduced by arranging the first sealing sheet and the second sealing sheet; through setting up the locating piece, can improve the stability of junction.
Fourthly, the stability of the connecting part can be improved by arranging the positioning block; the driving assembly and the fixing assembly are arranged, the driving block and the second spring drive the sliding block to move, the upper steel casing and the lower steel casing are fixed, the sliding block is separated from the corresponding accommodating groove through the mounting hole and the push rod, and therefore the two steel casings are separated.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of an outer casing according to one embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a steel casing according to one embodiment of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic structural diagram of a steel casing according to one embodiment of the present invention;
fig. 5 is an enlarged view of a portion B in fig. 4.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the project of the whale bay oil terminal in nanometer proportion, the construction of the cast-in-place pile is carried out by adopting a conventional method because the covering layer of the steel pile casing is shallow, the slurry leakage is serious in the hole forming process, and the construction process of the cast-in-place pile double casing is implemented in order to solve the problem of slurry leakage.
As shown in fig. 1, the construction process of the double pile casings of the cast-in-place pile comprises the following steps:
firstly, punching and drilling by using a first pile hammer at a designed pile position, and installing an outer protective cylinder 3, wherein the lower end of the outer protective cylinder 3 is positioned at 4-5 m of the upper end of a sand layer 1, the outer protective cylinder 3 is formed by connecting a plurality of sections, a guiding rule is used for detecting when the two sections of outer protective cylinders 3 are butted, three points are selected at the joint of the two sections of outer protective cylinders 3 according to equilateral triangle points for detection, the straightness of the two sections of outer protective cylinders 3 meets the condition that the deviation d is less than 1.33cm, and the top end of the outer protective cylinder 3 is higher than the designed elevation of a cast-in-place pile by 1m so as to ensure thorough grout return in the concrete casting process and further ensure the concrete casting quality;
step two, punching and drilling are carried out by using a second pile hammer in the outer protective barrel 3, drilling slag is removed by using a slag scooping barrel, the elevation of the bottom of a hole is measured, then an inner protective barrel 4 is coaxially installed in the outer protective barrel 3 (the top end of the inner protective barrel 4 is flush with the top end of the outer protective barrel 3), the lower end of the inner protective barrel 4 is positioned at a middle hard rock layer of 22-3 m, and the inspection standard of the joint of the two sections of inner protective barrels 4 refers to the detection method of the outer protective barrel 3 in the step one;
pouring mortar into the inner protective cylinder 4, repeatedly inserting and pulling by using a vibration hammer, tamping to enable the mortar to be filled in the gap of the hard rock stratum 2 in the hole bottom and between the bottom of the inner protective cylinder 4 and the hard rock outside the inner protective cylinder, reducing slurry leakage, and standing for 1d to obtain a mortar layer, wherein the height of the mortar layer is 1-2 m;
and step four, using a second pile hammer to penetrate through the mortar layer to continue drilling until a hole (namely the hole meeting the standard height requirement of the cast-in-place pile) is formed.
In this embodiment, the diameter of the first hammer bit is greater than the diameter of the second hammer bit. By adopting the technical scheme, the inner protective cylinder 3 and the inner protective cylinder 4 are jointly used, so that the side wall leakage of the inner protective cylinder 4 and the outer protective cylinder 3 can be effectively reduced, the mortar can be filled in the hard rock stratum 2 at the bottom of the hole by pouring the mortar in the inner protective cylinder 4 and tamping the mortar, the bottom leakage of the inner protective cylinder 4 is reduced, the collapse of the circumferential sand layer 1 of the inner protective cylinder 4 and the outer protective cylinder 3 and the hard rock stratum 2 is avoided, and the normal construction of the cast pile is ensured.
In another technical scheme, after the outer protective cylinder 3 is installed, the outer protective cylinder 3 is subjected to wall protection treatment, and the specific method of the wall protection treatment is as follows: removing the drilling slag and the seawater in the outer protective cylinder 3, adding fresh water into the outer protective cylinder 3, wherein the height of the fresh water in the outer protective cylinder 3 is lower than the sea level and higher than the sand layer 1 (the total amount of the fresh water in the outer protective cylinder 3 is calculated according to the depth of the fresh water), adding bentonite with the weight 0.2 times of the total mass of the fresh water, and stirring up and down by using a second pile hammer until the bentonite and the fresh water are uniformly mixed. By adopting the technical scheme, the slurry leakage from the side wall of the outer protective cylinder 3 can be effectively reduced.
In another solution, the inner and outer sheaths 4 and 3 are filled with clay. By adopting the technical scheme, the stability of the inner protective sleeve 4 can be effectively improved, the inner protective sleeve 4 is prevented from deviating when the second pile hammer is used for drilling, and slurry leakage of the side walls of the inner protective sleeve 4 and the outer protective sleeve 3 can be reduced.
In another technical scheme, hole cleaning treatment is carried out after hole forming, and the hole cleaning treatment specifically comprises the following steps:
s1, primary hole cleaning: pulling up the second pile hammer to the top surface of the steel platform, fixedly connecting a slurry pump pipe with the first pile hammer, then leading clean slurry into a formed hole through the slurry pump pipe until the sand content of the slurry in the formed hole is less than or equal to 4 percent and the sediment thickness at the bottom of the formed hole is less than or equal to 5cm, and completing primary hole cleaning;
s2, secondary hole cleaning: install the steel reinforcement cage earlier in the pore-forming, then follow the axis direction of interior casing 4 progressively transfers the concrete pipe, and the distance of concrete pipe bottom and hole bottom is 25 ~ 30cm, pours the pipe into the pore-forming hole bottom with the net thick liquid through the concrete, makes the mud come-up of hole bottom, forms the circulation clear hole, and no sediment is found to the pore-forming hole bottom, and secondary clear hole is accomplished. By adopting the technical scheme, the hole cleaning is realized, and the concrete is conveniently poured into the formed hole.
In another technical scheme, the holes are formed and cleaned, then concrete is poured to form a cast-in-place pile, and the concrete pouring adopts a vertical lift pipe method. By adopting the technical scheme, the cast-in-place pile is manufactured.
In another solution, as shown in fig. 2 to 5, the inner casing 4 and the outer casing 3 are both composed of a plurality of sections of steel casings 5, wherein:
arbitrary two adjacent sections of steel protect the steel that lies in the top in 5 of a section of thick bamboo 5 and protect a cylindrical location section of thick bamboo 6 of bottom rigid coupling, the internal diameter of a location section of thick bamboo 6 is greater than the steel protects the internal diameter, the external diameter of a section of thick bamboo 5 and is less than the steel protects the external diameter of a section of thick bamboo 5, a section of thick bamboo 5 is protected to the steel is located the bottom of a location section of thick bamboo 6 both sides is sunken respectively and is formed two annular spouts 801, two spouts 801 all with a section of thick bamboo 5 coaxial settings are protected to the steel, follows in two spouts 801 a section of thick bamboo 5 circumference intervals are protected to the steel and are equipped with multiunit drive assembly jointly, be equipped with the fixed subassembly of multiunit along its circumference interval in a location section:
each group of driving components comprises two sliding blocks which are respectively sealed and slide up and down in a one-to-one correspondence way (one implementation of the sealing sliding can be specifically that two side walls of the sliding groove 801 are respectively provided with a sliding way along the depth direction, two sliding blocks are symmetrically arranged on the driving block 804, the two sliding blocks are arranged in the two sliding ways in a one-to-one correspondence way, the side walls of the sliding ways at two sides of the sliding way are provided with rubber layers, the driving block 804 is abutted with the rubber layers so as to realize the sealing sliding connection of the driving block 804 and the sliding groove 801), the driving block 804 is arranged in the two sliding grooves 801, a through hole 802 used for communicating the two sliding grooves 801, and two fixed pulleys 805 which are respectively fixedly arranged, a first spring 803 is fixedly arranged at the end part of the driving block 804, the free end of the first spring 803 is fixedly connected with the bottom end of the sliding chute 801 corresponding to the free end, and the upper end of the through hole 802 is flush with the bottom end of the sliding chute 801;
each group of fixed components comprises a plurality of sliding cavities which are horizontally arranged in a penetrating way on the side wall of the positioning cylinder 6, the sliding cavities are arranged at intervals up and down, two sliding blocks 601 are arranged in each sliding cavity in a sliding way, a second spring 604 is connected between the two sliding blocks 601 at the lowest part, any two adjacent sliding cavities are communicated with a sliding hole 602 (the length of the sliding hole 602 in the horizontal direction is slightly smaller than that of the sliding block 601 in the horizontal direction), a connecting rod 603 is arranged in the sliding hole 602 in a sliding way, the upper end of the connecting rod 603 is connected with the sliding block 601 positioned above the connecting rod, the lower end of the connecting rod 603 is connected with the sliding block 601 positioned below the connecting rod, so that the sliding block 601 above is driven to move through the movement of the sliding block 601 below, a threading hole 607 is arranged between the sliding cavity at the lowest part and the through hole 802 in a penetrating way, the end parts of the two sliding blocks, the free end of the second steel wire rope 606 passes through the threading hole 607 and is connected with a third steel wire rope 807, two ends of the third steel wire rope 807 respectively pass through the two fixed pulleys 805 and are fixedly connected with the two driving blocks 804 corresponding to the third steel wire rope, and in the same fixing component, the vertical lengths of the sliding blocks 601 are sequentially increased from top to bottom so as to prevent the sliding blocks 601 from being incapable of entering the corresponding accommodating grooves 702;
the top end of the steel casing 5 positioned below in any two adjacent sections of steel casings 5 is recessed downwards to form an annular fixing groove 701, the fixing groove 701 and the steel casing 5 are coaxially arranged, a plurality of groups of accommodating components are arranged in the fixing groove 701 at intervals along the circumferential direction of the fixing groove 701, the groups of accommodating components and the groups of fixing components are arranged in a one-to-one correspondence manner, each group of accommodating components comprises a plurality of pairs of accommodating grooves 702 formed by the side wall of the fixing groove 701 at intervals, the pairs of accommodating grooves 702 are arranged at intervals up and down, two accommodating grooves 702 in each pair of accommodating grooves 702 are respectively positioned on two side walls of the fixing groove 701 (the notches of each pair of accommodating grooves 702 are opposite) so as to respectively accommodate two sliding blocks 601 in the same sliding cavity, an installation hole 703 penetrates through the bottom end of each accommodating groove 702 in the pair of the lowermost accommodating groove 702, and a push rod is detachably connected in the installation hole 703 (one realization manner, so as to realize the detachable connection of the push rod and the mounting hole 703), wherein the end parts of the steel casing 5, which are positioned at the two sides of the fixing groove 701, are fixedly provided with annular positioning blocks 704, the two positioning blocks 704 are coaxially arranged with the steel casing 5, the fixing groove 701 is matched with the positioning parts, and the end part of the mounting hole 703, which is far away from the corresponding fixing groove 701, is provided with a sealing cover so as to seal the mounting hole 703 when the steel casing 5 is placed downwards, thereby avoiding slurry from entering the mounting hole 703 and a sliding cavity to influence the normal use;
the depth of the fixing groove 701 is 1/8 the length of the steel casing 5, the upper end of the positioning block 704 is covered with a first sealing strip, the end of the driving block 804 far away from the first spring 803 is covered with a second sealing strip, and before any two adjacent sections of steel casings 5 are connected: the driving block 804 partially protrudes out of the sliding groove 801, the sliding blocks 601 are respectively located in the corresponding sliding cavities, the first spring 803 and the second spring 604 are both in a contracted state, the push rod is separated from the mounting hole 703, and when any two steel casing 5 are connected: the locating piece 704 is located in the sliding groove 801, the sliding blocks 601 are located in the accommodating grooves 702 in a one-to-one correspondence mode, the bottom end of the steel pile casing 5 located above is abutted to the top end of the steel pile casing 5 located below, and the bottom end of the locating cylinder 6 of the steel pile casing 5 located above is abutted to the lower end of the fixing groove 701 located in the steel pile casing 5 located below. In the technical scheme, when two sections of steel protection cylinders 5 are connected, the push rod is separated from the mounting hole 703, when the two sections of steel protection cylinders 5 are disassembled, the push rod is inserted into the mounting hole 703, the slide block 601 is pushed by the push rod to move into the slide cavity, so that the slide block 601 is separated from the corresponding accommodating groove 702, when the upper end of the positioning block 704 positioned above is in contact with the driving block 804, the slide cavity positioned at the lowest part is positioned in the fixing groove 701, and when the two sections of steel protection cylinders 5 are connected in the using process: the steel pile casing 5 moves downwards, the positioning block 704 abuts against the driving block 804 and pushes the driving block 804 to move upwards, when the bottom end of the positioning cylinder 6 moves to abut against the bottom of the fixing groove 701, the second spring 604 drives the slider 601 located at the lowest part to move, the slider 601 at the lowest part sequentially drives the sliders 601 to move until the sliders 601 all enter the corresponding accommodating groove 702, and the two sections of steel pile casings 5 are fixed; when the two sections of steel protection cylinders 5 are separated: the sealing cover is opened, the push rod is inserted into the mounting hole 703, the push rod is pushed until the slide block 601 is separated from the corresponding accommodating groove 702, the upper steel casing 5 is moved upwards or the lower steel casing 5 is moved downwards, the two steel casings 5 are separated, the first spring 803 drives the driving block 804 to move downwards until the part of the driving block 804 protrudes out of the sliding groove 801, and the slide block 601 is located in the corresponding sliding cavity. By adopting the technical scheme, the steel casing 5 designed by the invention has the advantages that on one hand, the positioning effect is realized on the upper and lower sections of steel casing 5, the upper and lower sections of steel casing 5 are effectively prevented from deviating in the installation process, the installation accuracy of the steel casing 5 is improved, and on the other hand, compared with the prior art that the upper and lower sections of steel casing 5 are welded, the separation of the upper and lower sections of steel casing 5 is more convenient, the recycling of the steel casing 5 is facilitated, and simultaneously, the slurry leakage from the joint can be reduced, and the normal operation of the cast-in-place pile construction is ensured; the positioning cylinder 6 is positioned in the fixing groove 701, so that dislocation of the upper and lower steel casing cylinders 5 is effectively avoided, slurry leakage at a joint can be effectively avoided, and meanwhile, the sealing performance of the joint can be further improved and slurry leakage is reduced by arranging the first sealing sheet and the second sealing sheet; by arranging the positioning block 704, the stability of the connection part can be improved; the driving assembly and the fixing assembly are arranged, the driving block 804 and the second spring 604 drive the sliding block 601 to move, the upper steel casing 5 and the lower steel casing 5 are fixed, the sliding block 601 is separated from the corresponding accommodating groove 702 through the arrangement of the mounting hole 703 and the push rod, and therefore the two steel casings 5 are separated.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Application, modification and variation of the cast-in-place pile double casing construction process of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (5)
1. The construction process of the double pile casings of the cast-in-place pile is characterized by comprising the following steps of:
step one, installing an outer protective cylinder, wherein the lower end of the outer protective cylinder is positioned at 4-5 m of a sand layer;
step two, coaxially installing an inner casing in the outer casing, wherein the lower end of the inner casing is located at 2-3 m of the medium hard rock stratum;
pouring mortar into the inner protective cylinder, tamping and standing to obtain a mortar layer, wherein the height of the mortar layer is 1-2 m;
drilling continuously through the mortar layer until a hole is formed;
the inner protective cylinder and the outer protective cylinder are composed of a plurality of sections of steel protective cylinders, wherein:
arbitrary two adjacent sections steel protect the steel that lies in the top in the section of thick bamboo and protect a bottom rigid coupling cylindric location section of thick bamboo, the internal diameter of a location section of thick bamboo is greater than the steel protects an internal diameter, the external diameter of a section of thick bamboo and is less than the steel protects the external diameter of a section of thick bamboo, the steel protects a position the bottom of a location section of thick bamboo both sides is sunken respectively and is formed two annular spouts, two spouts all with the steel protects a coaxial setting, follows in two spouts a steel protects a circumference interval and is equipped with multiunit drive assembly jointly, be equipped with the fixed subassembly of multiunit along its circumference interval in the location section of thick bamboo, multiunit drive assembly and multiunit locating component one-to-one setting:
each group of driving assemblies comprises two driving blocks which are respectively sealed and arranged in the two sliding chutes in a sliding manner up and down in a one-to-one correspondence manner, through holes used for communicating the two sliding chutes, and two fixed pulleys which are respectively fixedly arranged at the bottoms of the two sliding chutes in a one-to-one correspondence manner, wherein the end parts of the driving blocks are fixedly provided with first springs, the free ends of the first springs are fixedly connected with the bottom ends of the sliding chutes corresponding to the first springs, and the upper ends of the through holes are flush with the bottom ends of the;
each group of fixed components comprises a plurality of sliding cavities which are arranged by penetrating through the side wall of the positioning cylinder, the sliding cavities are arranged at intervals from top to bottom, two sliding blocks are arranged in each sliding cavity in a sliding mode, a second spring is connected between the two sliding blocks positioned at the lowest part, any two adjacent sliding cavities are communicated with a sliding hole, a connecting rod is arranged in each sliding hole in a sliding mode, the upper end of each connecting rod is connected with the sliding block positioned above the connecting rod, the lower end of each connecting rod is connected with the sliding block positioned below the connecting rod, a threading hole is arranged between the sliding cavity positioned at the lowest part and the threading hole in a penetrating mode, a first steel wire rope is fixedly arranged at the end part of each two sliding blocks positioned at the lowest part, a second steel wire rope is fixedly arranged in the middle of each first steel wire rope, the free end of each second steel wire rope penetrates through the threading hole and is connected with a third steel, in the same fixed assembly, the vertical lengths of the sliding blocks are sequentially increased from top to bottom;
the top end of the steel pile casing below any two adjacent sections of steel pile casings is sunken downwards to form an annular fixing groove, the fixing groove and the steel pile casings are coaxially arranged, a plurality of groups of containing assemblies are arranged in the fixing groove at intervals along the circumferential direction of the fixing groove, the plurality of groups of containing assemblies and the plurality of groups of fixing assemblies are arranged in a one-to-one correspondence manner, each group of containing assemblies comprises a plurality of pairs of containing grooves formed by the interval sunken part of the side wall of the fixing groove, the plurality of pairs of containing grooves are arranged at intervals up and down, two containing grooves in each pair of containing grooves are respectively positioned on two side walls of the fixing groove to respectively contain two sliding blocks in the same sliding cavity, the bottom end of each containing groove in the pair of containing grooves at the lowest position is provided with a mounting hole in a penetrating manner, a push rod is detachably connected in the mounting hole, wherein annular positioning blocks, the fixing groove is matched with the positioning part, and the end part of the mounting hole, which is far away from the fixing groove corresponding to the mounting hole, is provided with a sealing cover;
the depth of the fixed groove is 1/8 of the length of the steel casing, the upper end of the positioning block is covered with a first sealing sheet, the end part of the driving block far away from the first spring is covered with a second sealing sheet, and any two adjacent sections of steel casing are connected before: the driving block partially protrudes out of the sliding groove, the sliding blocks are respectively positioned in the corresponding sliding cavities, the second spring contracts, the push rod is separated from the mounting hole, and when any two sections of steel casing are connected: the locating piece is located in the spout, the slider one-to-one is located in the holding tank, the bottom that the steel that is located the top protects a section of thick bamboo and the top butt that is located the below steel and protects a section of thick bamboo, the bottom that the steel that is located the top protects a section of thick bamboo of location and the low side butt that is located the fixed slot in the below steel protects a section of thick bamboo.
2. The construction process of a double casing of a cast-in-place pile as claimed in claim 1, wherein after the outer casing is installed, the outer casing is subjected to wall protection treatment, and the specific method of the wall protection treatment is as follows: removing the drilling slag and the seawater in the outer protective cylinder, then adding fresh water into the outer protective cylinder, adding bentonite with the weight 0.2 times of the total weight of the fresh water, and stirring until the bentonite and the fresh water are uniformly mixed.
3. The process of claim 1, wherein clay is filled between the inner casing and the outer casing.
4. The construction process of the double pile casings of the cast-in-place pile as claimed in claim 1, wherein hole cleaning is performed after hole forming, and the hole cleaning specifically comprises the following steps:
s1, primary hole cleaning: cleaning the hole for the first time by using a slurry pump pipe;
s2, secondary hole cleaning: and installing a reinforcement cage and a concrete pouring guide pipe in the formed hole, and circularly cleaning the hole by using the concrete pouring guide pipe.
5. A cast-in-place pile double-casing construction process as claimed in claim 4, wherein the cast-in-place pile is formed by casting concrete after hole cleaning treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910087227.7A CN109706921B (en) | 2019-01-29 | 2019-01-29 | Construction process for double pile casings of cast-in-place pile |
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| CN110485414A (en) * | 2019-08-26 | 2019-11-22 | 中建五局第三建设有限公司 | A kind of double casing rotary digging stake techniques in drift sand stratum |
| CN111851478A (en) * | 2020-07-13 | 2020-10-30 | 深圳市工勘岩土集团有限公司 | Pile-forming construction method for light corrugated steel pile casing isolation non-filling karst cave filling pile |
| CN111809616B (en) * | 2020-07-30 | 2021-10-12 | 江苏师范大学 | Self-locking mechanical connecting device and connecting method |
| CN117605023B (en) * | 2024-01-23 | 2024-03-22 | 中铁建工集团有限公司 | Bored pile construction device and construction method thereof |
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| CN101761072B (en) * | 2008-12-24 | 2011-11-09 | 上海市基础工程有限公司 | Construction process for bored pile close to flood wall through riprap layer |
| CN103967032A (en) * | 2014-04-16 | 2014-08-06 | 青岛理工大学 | Double-protective-cylinder cast-in-situ bored pile used for highly-corrosive salty soil and construction method of double-protective-cylinder cast-in-situ bored pile |
| CN106149683A (en) * | 2015-04-23 | 2016-11-23 | 五冶集团上海有限公司 | A kind of cast-in-place pile construction method using double casing to pass through deep metalling |
| CN105040681B (en) * | 2015-07-21 | 2017-01-25 | 中铁隧道集团有限公司 | Method for manufacturing and constructing large-diameter super-long test pile |
| CN105672255B (en) * | 2016-02-22 | 2018-07-27 | 深圳市工勘岩土集团有限公司 | Control the construction method for double pile casings of verticality |
| CN108408636A (en) * | 2018-02-01 | 2018-08-17 | 重庆恒佳工程技术咨询有限公司 | A kind of two-way jacking component of intelligent tensioning |
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