阅读说明：本技术 一种嵌岩斜桩冲击钻进成桩施工工艺 (Rock-socketed inclined pile impact drilling pile-forming construction process ) 是由 胡培强 尧在雨 周伏萍 邹明 敖小平 于 2020-05-05 设计创作，主要内容包括：本发明公开了一种嵌岩斜桩冲击钻进成桩施工工艺,属于港口码头管桩施工技术领域,嵌岩斜桩冲击钻进成桩施工工艺包括包括如下步骤：S1、施工准备阶段；S2、安装钢护筒导向架；S3、冲击成孔；S4、第一次清孔；S5、安放钢筋笼；S6、安放导管；S7、二次清孔；S8、灌注混凝土。本发明公开的嵌岩斜桩冲击钻进成桩施工工艺,通过运用自研的设备以及工艺相结合,解决了斜桩施工技术难题,保证了斜桩倾度和成桩质量,满足斜桩设计要求。(The invention discloses an impact drilling pile-forming construction process for an embedded rock inclined pile, which belongs to the technical field of port and wharf pipe pile construction, and comprises the following steps: s1, construction preparation; s2, mounting a steel pile casing guide frame; s3, punching; s4, cleaning holes for the first time; s5, placing a reinforcement cage; s6, placing a catheter; s7, secondary hole cleaning; and S8, pouring concrete. The invention discloses a construction process for forming a rock-socketed inclined pile by impact drilling, which solves the technical problem of inclined pile construction by combining self-ground equipment and processes, ensures the inclination of the inclined pile and the pile forming quality, and meets the design requirement of the inclined pile.)

1. A rock-socketed inclined pile impact drilling pile-forming construction process is characterized by comprising the following steps:

s1, construction preparation stage: the construction preparation stage comprises the steps of building a construction platform, conducting guiding test and rechecking on each control point, preparing construction materials and making safety protection measures;

s2, mounting a steel protection cylinder guide frame: the steel pile casing guide frame is composed of a plurality of I-shaped steels, two ends of the steel pile casing are positioned through a positioner made of the I-shaped steels with sliding grooves, the inclination of the pile is controlled by utilizing the inclination of the steel pile casing, the steel pile casing is sunk after the angle of the steel pile casing is adjusted, and the sunk steel pile casing is operated by adopting a vibration hammer;

s3, impact hole forming: the percussion drilling machine is used for carrying out drilling construction under the geological condition containing boulders, pebble layers and hard rocks, the drill bit is a cylindrical hollow drill bit and can rotate in all directions and impact strata in a free falling mode, the hammer head is easy to hang a protective cylinder and correct the direction effect of the drill bit when an inclined hole is punched, the resistance is small during drilling, the cutting force is large, the hole forming efficiency is high, and slurry required in the impacting process is prepared in a nearby steel protective cylinder or a slurry pond which is not embedded with rocks for construction, so that slurry making and slag discharging are carried out;

s4, cleaning holes for the first time: after the final hole inspection and acceptance, the hole is cleaned for the first time by air lift reverse circulation, and the bottom of the hole is ensured to be always in a clean state;

s5, placing a reinforcement cage: when the reinforcement cage is lengthened, the direction of the reinforcement cage is controlled by adopting a cable and a chain block, and the center of the reinforcement cage is ensured to be consistent with the design center of the inclined pile. The main reinforcements of the reinforcement cage are connected by adopting a pier thick straight thread sleeve process, and the outer ring of the reinforcement cage is provided with a sufficient number of protective layer cushion blocks to ensure that the reinforcement cage is centered and consistent in the drawing line direction of the inclined pile;

s6, placing a catheter: the pipe axis process needs to be basically coincided with the axis of the steel casing, and the rugby type concrete pouring guide pipe is arranged on the bottom pipe and the top pipe;

s7, secondary hole cleaning: after the guide pipe is completely arranged, secondary hole cleaning is carried out by adopting gas lift reverse circulation or pump suction reverse circulation, and the thickness of the sediment at the bottom of the hole and the slag content of the washing liquid are simultaneously observed in the hole cleaning process until the thickness index of the sediment at the bottom of the hole meets the requirement;

s8, pouring concrete: and after the sediments are removed completely, immediately pouring concrete, and supplying the concrete through the construction channel platform by using a tank car.

2. The rock-socketed inclined pile impact drilling pile-forming construction process according to claim 1, characterized in that:

the cylinder-type hollow drill used in step S3, the cylinder-type hollow drill including a cylinder body;

the cylinder body is rolled by a steel plate and is processed and welded into a steel cylinder body by two sections, round steel is welded outside the cylinder in a spiral shape and is in a full-length shape, and the round steel assists the pile hammer to rotate when the drill bit impacts;

a reinforcing steel ring is welded at the upper end of the barrel body hammer head, and a hanging seat, a hanging ring and a salvaging steel wire rope disc which are used for connecting a steel wire rope of the punching pile machine are welded at one end of the barrel body hammer tail;

the bottom end of the drill bit is welded with a drill tooth base, the drill tooth base is positioned at the bottom end of the drill bit, the number of the drill tooth bases is six, and the six drill tooth bases are uniformly welded on the dragon tube in the circumferential direction;

a base diagonal support is arranged on the base, forms an angle of 45 degrees with the drill bit wall and the pipe and is fully welded on the drill bit wall and the pipe;

four hard alloy drill teeth are symmetrically welded on each base, one drill tooth is welded at the center of each base, twenty-one hard alloy drill teeth are arranged on the impact hammer, and the matrix of each drill tooth enters the barrel body by 10 mm.

3. The rock-socketed inclined pile impact drilling pile-forming construction process according to claim 1, characterized in that:

in step S3, different impact strokes are set according to different soil layers, high-frequency short-stroke impact is adopted when drilling in the soil layers, and the impact stroke is 0.6-0.8 m/impact; when drilling in rock, the well is impacted by adopting low frequency and high stroke, and the impact stroke is 1.0-1.2 m/stroke.

4. The rock-socketed inclined pile impact drilling pile-forming construction process according to claim 1, characterized in that:

in step S6, before the guide pipe is placed, a water tightness test (P is more than or equal to 0.75MPa) of the connecting part of the guide pipe is carried out, and the concrete is ensured not to leak or separate in the blanking process.

5. The rock-socketed inclined pile impact drilling pile-forming construction process according to claim 1, characterized in that:

in step S6, the pipe is a rugby-type concrete pouring pipe, the rugby-type concrete pouring pipe is machined by a heavy seamless steel pipe, the pipe is connected by a screw thread, and the pipe is sealed by a double-layer rubber sealing ring. The rugby type protection device of the rugby type concrete pouring guide pipe consists of four symmetrically-installed arc-shaped deformed steels, and the arc-shaped deformed steels and the guide pipe are in full-welding connection by adopting steel plates.

Technical Field

The invention relates to the technical field of port and wharf pipe pile construction, in particular to a rock-socketed inclined pile impact drilling pile-forming construction process.

Background

The inclined pile is widely applied to foundations of buildings such as bridges, wharfs, large-span gymnasiums and large-scale power transmission lines, books and specifications related to the design and construction problems of a vertical pile foundation are discussed in detail in production operation, but research on the inclined pile is less, and particularly, a pile forming process of a large-diameter pile under the condition of the geology containing boulders, pebble beds and hard rocks is still deficient.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a rock-socketed inclined pile impact drilling pile-forming construction process, which adopts special equipment and a construction process to solve the pile-forming construction of the inclined pile under the condition that a large-diameter pile contains boulders, pebble beds and hard rock geology.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a rock-socketed inclined pile impact drilling pile-forming construction process, which comprises the following steps:

s1, construction preparation stage: the construction preparation stage comprises the steps of building a construction platform, conducting guiding test and rechecking on each control point, preparing construction materials and making safety protection measures;

s2, mounting a steel protection cylinder guide frame: the steel protecting cylinder guide frame is composed of a plurality of I-shaped steels, two ends of the steel protecting cylinder are positioned through a positioner made of the I-shaped steels with sliding grooves, the steel protecting cylinder sinks after the angle of the steel protecting cylinder is adjusted, and the steel protecting cylinder sinks by adopting a vibration hammer for operation;

s3, impact hole forming: selecting an impact drilling machine for impact-breaking rock-soil layers in an impact hole forming mode, wherein a cylinder-type hollow drill bit is adopted as the drill bit, and required slurry is prepared in a nearby steel protective cylinder without rock embedding construction or a slurry pool for slurry making and slag discharging;

s4, cleaning holes for the first time: after the final hole inspection and acceptance, the hole is cleaned for the first time by air lift reverse circulation, and the bottom of the hole is ensured to be always in a clean state;

s5, placing a reinforcement cage: when the reinforcement cage is lengthened, the direction of the reinforcement cage is controlled by adopting a cable and a chain block, and the center of the reinforcement cage is ensured to be consistent with the design center of the inclined pile. The main reinforcements of the reinforcement cage are connected by adopting a pier thick straight thread sleeve process, and the outer ring of the reinforcement cage is provided with a sufficient number of protective layer cushion blocks to ensure that the reinforcement cage is centered and consistent in the drawing line direction of the inclined pile;

s6, placing a catheter: the pipe axis process needs to be basically coincided with the axis of the steel casing, and the rugby type concrete pouring guide pipe is arranged on the bottom pipe and the top pipe;

s7, secondary hole cleaning: after the guide pipe is completely arranged, secondary hole cleaning is carried out by adopting gas lift reverse circulation or pump suction reverse circulation, and the thickness of the sediment at the bottom of the hole and the slag content of the washing liquid are simultaneously observed in the hole cleaning process until the thickness index of the sediment at the bottom of the hole meets the requirement;

s8, pouring concrete: and after the sediments are removed completely, immediately pouring concrete, and supplying the concrete through the construction channel platform by using a tank car.

Preferably, the cylindrical hollow drill used in step S3 comprises a cylindrical body made of steel plate, the cylindrical body is made of two sections of steel plate by welding, the cylindrical body is externally provided with a spiral through long welding round steel, the round steel assists the rotation of the pile hammer when the drill impacts, the upper end of the hammer head of the cylindrical body is welded with a reinforcing steel ring, one end of the hammer tail of the cylindrical body is welded with a hanging seat, a hanging ring and a fishing steel wire rope disk for connecting a steel wire rope of a punching pile machine, the bottom end of the drill is welded with a drill tooth base, the drill tooth base is arranged at the bottom end of the drill, the number of the drill tooth bases is six, the six drill tooth bases are circumferentially and uniformly welded on the pipe, the base is provided with a base inclined strut, the base inclined strut forms a 45-degree angle with the wall of the drill and the pipe and is fully welded on the wall of the drill and the pipe, four drill teeth made of hard alloy are symmetrically welded on each base, one drill tooth is welded, twenty-one hard alloy drill teeth are arranged on the impact hammer, and the drill tooth matrix enters the barrel body by 10 mm.

Preferably, in step S3, different impact strokes are set according to different soil layers, and high-frequency short-stroke impact is adopted when drilling in the soil layers, wherein the impact stroke is 0.6-0.8 m/impact; when drilling in rock, the low-frequency and high-stroke impact is adopted, and the impact stroke is 1.0-1.2 m/impact.

Preferably, in step S6, a water tightness test (P ≧ 0.75MPa) is performed on the connecting portion of the conduit before the conduit is installed, so as to ensure that the concrete does not leak or segregate during the discharging process.

Preferably, in step S6, the conduit is a rugby ball type concrete pouring conduit, the rugby ball type concrete pouring conduit is machined by a heavy seamless steel pipe, the conduit is connected by a screw thread, and the conduit is sealed by a double-layer rubber sealing ring. The rugby type protection device of the rugby type concrete pouring guide pipe consists of four symmetrically-installed arc-shaped deformed steels, and the arc-shaped deformed steels and the guide pipe are in full-welding connection by adopting steel plates.

The invention has the beneficial effects that:

1. by adopting special equipment and construction technology, the inclined pile forming construction of the large-diameter pile under the geological condition containing boulders, pebble beds and hard rocks is realized, the technical problem of inclined pile construction is solved, the inclination and pile forming quality of the inclined pile are ensured, and the design requirement of the inclined pile is met;

2. the self-made steel pile casing guide frame is adopted, so that the inclination of the steel pile casing is ensured, and further the pile-forming inclination is ensured;

3. the cylinder-column hollow hammer drill with the improved design is adopted to impact and form holes, so that smooth hole forming in the layer containing boulders, pebbles and hard rocks is ensured;

4. the Rugby type concrete pouring guide pipe is adopted, so that the problems that a steel reinforcement cage is easily hung at the position of a guide pipe joint when inclined holes are poured, the joint thread is broken and the like are solved, and the pouring quality of the inclined pile is ensured.

Drawings

FIG. 1 is a schematic diagram of a batter post punch provided in an embodiment of the present invention;

FIG. 2 is a flow chart of a construction process provided in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a steel casing guide provided in an embodiment of the present invention;

FIG. 4 is a front view of a barrel drill bit body provided in an embodiment of the present invention;

FIG. 5 is a side view of a barrel drill bit body provided in an embodiment of the present invention;

FIG. 6 is a schematic view of a dental drill base provided in an embodiment of the present invention;

FIG. 7 is a schematic view of a barrel-and-column percussive drill bit sprag provided in an embodiment of the present invention;

fig. 8 is a schematic view of a reinforcement cage guide wheel arrangement provided in an embodiment of the present invention;

FIG. 9 is a schematic view of a rugby ball concrete placement catheter provided in an embodiment of the present invention;

fig. 10 is a schematic diagram of concrete pouring of the inclined pile according to the embodiment of the present invention.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 to fig. 9, the rock-socketed inclined pile impact drilling pile-forming construction process provided in this embodiment is applicable to a construction method with an inclination smaller than 1: 5 (the verticality is about 88.5 degrees), the pile diameter is 600 and 1500mm, the pile length is not more than 45m, and the steel tapping protects the inclined pile that the cylinder bottom is less than 6 meters outside, including the following steps:

s1, construction preparation stage: after the constructor is in the construction site, the construction site is leveled, a construction access or a construction platform is built so as to facilitate the walking and the construction of the heavy vehicle, and the construction is carried out according to the design construction drawing requirement to release the pile position on the ground or the elevation of the platform. The method is characterized in that guiding measurement and rechecking are carried out on each control point, control line, elevation and the like, so that the pile position of the inclined pile is accurately controlled, cohesive soil or bentonite for stirring the steel casing and materials such as sand, stone, cement steel and the like for stirring concrete are prepared in place according to the design requirements, a mud pit of a construction site is arranged, and the environment pollution caused by mud is prevented. Before construction, a water source and a power supply are connected to the vicinity of each device, various safety protection measures are made, and the normal operation can be performed only after the safety inspection and acceptance are qualified;

s2, mounting a steel protection cylinder guide frame: and (3) releasing the pile position according to a construction drawing, and manufacturing and installing a guide frame of the inclined pile steel pile casing, wherein the guide frame consists of a top frame, a bottom frame and a vertical frame, all 32# I-steel is adopted, and the inner diameters of the top frame and the bottom frame are preferably larger than the diameter of the pile by 300 mm. The top frame consists of two welded section steels with the length of 6-9 meters and the length of about 2 meters, and a steel casing positioner is arranged at the central point of the top frame; the underframe is composed of two welded steel sections with the length of 6 meters and the length of 2 meters, and a steel casing positioner is arranged at the central point of the underframe. The steel protects a locator and adopts 10# I-steel, and length 300mm is left and right, and the perpendicular to is full-welded on roof-rack and chassis, and the steel that sinks protects a section of thick bamboo: the vibration hammer is adopted, and the vibration hammer is preferably ZD-90 type and has the power of 90 kilowatts. The length of the single-section steel casing is not more than 18 m. If the steel pile casing does not completely go down to the position once, the pile casing is lengthened and followed in the drilling process, namely the elevation of the bottom of the pile casing is 6m higher than that of the bottom of the pile. The steel casing is connected with the orifice;

s3, impact hole forming: according to the characteristics of the lithology of the stratum, a JKL-8 type impact drilling machine is selected for rock-socketed construction; each drilling machine is provided with 1 22KW mud pump for changing the mud, and the mud is 12m³And (5) performing gas lift reverse circulation hole cleaning by using an air compressor. The technical parameters of the percussion drilling machine are shown in the following table;

percussion drilling machine technical parameters

According to the requirements of the maximum rock-socketed depth and the size of the pile diameter D, the length of the cylindrical drill bit is designed to be 7D, the cylindrical drill bit is cylindrical, a steel casing is used for guiding when impact hole forming is carried out, and the length of the cylindrical drill bit in the steel casing is not less than the length of the 1/3 drill bit. The total weight of the cylindrical drill bit is about 8000kg, and the upper end of the cylindrical drill bit is manufactured as follows: after the stack shell preparation, at stack shell hammerhead upper end welding thickness 25mm, highly be 150 mm's enhancement steel ring to be radial center symmetry on the steel ring and weld 3 thickness 35mm, supply to connect the seat of hanging, rings and the salvaging wire rope dish of punching a hole stake machine wire rope on stack shell hammer tail one end welding, the stack shell preparation of tube-shape drill bit: the cylinder body is rolled by a steel plate and is processed and welded into a steel cylinder body by 2 sections, and the thickness of the cylinder wall is 40 mm; the outside of the cylinder is welded with round steel with phi of 18mm in a spiral through length mode, and the interval between the round steel is not more than 300 mm. The pile hammer is rotatory when round steel auxiliary drill bit strikes, reduces the barrel and protects the frictional force between the section of thick bamboo and the steel and protect the effect at a mouthful with the drill bit that doubles simultaneously, and the preparation of drill bit bottom brill tooth base: the drill bit base is welded at the bottom end of the drill bit, the drill bit base is 250mm high, 6 drill bit bases are 40mm thick and are radially and fully welded on a 20 mm-thick pipe with the length of 1500mm and the diameter of 300mm, the base inclined strut and the pipe inclined strut are both made of steel plates with the thickness of 40mm, and the steel plates form an angle of 45 degrees with the drill bit wall and the pipe and are fully welded on the drill bit wall and the pipe. The upper end of the pipe diagonal brace is close to the upper end of the pipe, and the length of the joint of the pipe diagonal brace, the pipe diagonal brace and the wall of the drill bit is 500 mm. The lower end of the inclined strut of the base is fully welded on the base, the length is about 50mm, and the drill teeth are welded: 4 drill teeth made of 100 mm-thick hard alloy are symmetrically welded on each base, the center of each base is 1, and 21 hard alloy drill teeth are arranged on one punch hammer. The matrix of the drill bit enters the barrel by about 10 mm. The drill teeth can be replaced according to the use condition, the drilling machine, the drill bit, accessories, a crane and the like are lifted and transported to the site in batches, the drilling machine, the drill bit, the crane and the like are placed on the hole site of the working platform by using an 80T crawler crane, the derrick mast of the impact drilling machine is pushed forward according to the inclination of the immersed steel casing, the inclination from the front edge of the derrick mast top pulley to the center line of the top opening of the steel casing is consistent with the inclination of the pile, the bottom is required to be flattened and kept stable when the drilling machine is installed, displacement and subsidence cannot be generated, the top end is symmetrically tensioned by using a cable wind rope, the deviation of the drill bit in the center of the casing cannot be larger than 50mm, and. The required mud is prepared in a nearby steel casing or mud tank without embedded rocks (construction), and is used for slurry making and slag discharging. The hammer head is stably lifted in the drilling process, so that the steel casing is prevented from being collided; continuously operating in the drilling process, checking rock samples at any time, setting different impact strokes according to different soil layers, and drilling in the soil layers by adopting high-frequency short-stroke impact, wherein the impact stroke is 0.6-0.8 m/impact; the method comprises the following steps of adopting low-frequency and high-stroke impact during drilling in rocks, wherein the impact stroke is 1.0-1.2 m/impact, and in the drilling process, the hole site center and the wire drawing direction of a steel wire rope are required to be rechecked at any time, the main method comprises the steps of hanging a drill bit naturally, restoring the hole site center by using a pile protection cross wire, measuring the deviation between the cross wire center and a drill bit lifting rope by using a steel ruler, analyzing reasons in time to correct when the deviation exceeds 50mm, and checking with an industrial exploration report in time after drilling to a bearing stratum to finish a hole when the condition of the final hole is reached;

s4, cleaning holes for the first time: after the final hole inspection and acceptance, the hole is cleaned for the first time by air lift reverse circulation, and the bottom of the hole is ensured to be always in a clean state;

s5, placing a reinforcement cage: the steel reinforcement cage concentrates machine-shaping in land production place, and every section steel reinforcement cage length 9m adjusts according to the stake length simultaneously, can once install when steel reinforcement cage length is not more than 18m, on the hoop is strengthened to the steel reinforcement cage, every 3m equipartition sets up 6 leading wheels, sees figure 8. After the reinforcing steel bars are manufactured, the reinforcing steel bars are transported to the position near the corresponding bearing platform by adopting a working ship in batches, then the reinforcing steel bars are lifted and placed in place by using a crane ship or an 80t crane, and the direction of the reinforcing steel bar cage is controlled by adopting a cable and a chain block when the reinforcing steel bar cage is lengthened, so that the center of the reinforcing steel bar cage is ensured to be consistent with the design center of the inclined pile. The main reinforcements of the reinforcement cage are connected by adopting a pier thick straight thread sleeve process, and the number of joints on the same section is not more than 50%. The outer ring of the reinforcement cage is provided with a sufficient number of protective layer cushion blocks to ensure that the reinforcement cage is centered and consistent in the direction of the drawing line of the inclined pile, and after the reinforcement cage is placed in place, the reinforcement cage is uniformly distributed and welded at the top end of the steel pile casing by adopting 6 reinforcing steel bars with the diameter of phi 25mm to prevent the reinforcement cage from floating upwards when concrete is poured;

s6, placing a catheter: designing and manufacturing a rugby type concrete pouring conduit: the rugby type concrete pouring conduit is processed by adopting a heavy seamless steel pipe with the thickness of 10mm, the diameter of the conduit is 300mm, and the length of each conduit is 3000 mm. The guide pipe is connected by screw threads, the screw threads are lengthened to 120mm, and the double-layer rubber sealing ring is arranged. 28# arc-shaped screw steel is symmetrically arranged on 4 football-shaped protection devices of the football-shaped concrete pouring guide pipe, the arc height is 120mm, and the arc horizontal length is 2000 mm. The arc deformed steel bar and the guide pipe are fully welded by adopting a steel plate with the thickness of 20mm, a 16-ton truck crane is adopted for installation, in order to ensure that the guide pipe is smoothly arranged, the axis of the guide pipe needs to be basically coincided with the axis of a steel pile casing (pile hole), and the rugby type concrete pouring guide pipe is installed outside a bottom pipe and a top pipe and is also installed every other 10m or so. Before the guide pipe is arranged, a water tightness test (P is more than or equal to 0.75MPa) of the connecting part of the guide pipe is carried out, so that the concrete is ensured not to leak or separate in the feeding process;

s7, secondary hole cleaning: after the guide pipes are completely arranged, secondary hole cleaning is carried out by adopting gas lift reverse circulation or pump suction reverse circulation, and the secondary hole cleaning is the key for ensuring the quality of the pile bottom. Cleaning the hole by adopting a pump pumping reverse circulation process, continuously performing pump pumping reverse circulation cleaning at a position of the drilling tool 50-80 mm away from the bottom of the hole, and simultaneously observing the sediment thickness of the bottom of the hole and the slag content of the washing liquid until the sediment thickness index of the bottom of the hole meets the requirement;

s8, pouring concrete: after sediment is removed completely, concrete is poured immediately, concrete is supplied by a tank car through a construction channel platform, the slump of the concrete is controlled to be between 180 and 220mm, the volume of the concrete for the first time is calculated according to the conditions of hole depth, hole diameter and the like before pouring, the buried depth of a first poured concrete guide pipe needs to be more than 1m, the buried depth of the guide pipe needs to meet the requirement of 2-6 m in the concrete pouring process, the continuity of concrete pouring is ensured, the pile is prevented from being broken, and the concrete is poured to the designed pile top elevation 1m to ensure the quality of the pile top concrete.

The inclined pile construction equipment required by the process is selected to meet the requirements during construction according to the pile diameter, the pile length, the weight of the reinforcement cage and the like of the inclined pile, and various materials required by construction are acquired and purchased into qualified materials according to the design drawing requirements of the inclined pile. The main equipment and materials are as follows.

Material and main equipment configuration table

In the working procedure of the sinking inclined pile steel casing, the construction process of the inclined pile utilizes the steel casing as a guide, the position, the posture and the inclination angle of the steel casing determine the position, the posture and the inclination angle of the inclined pile, so the sinking construction quality of the steel casing is strictly controlled, during site construction, the positioning of the steel casing depends on a GPS positioning system and two total stations to precisely control the position, the inclination angle and the posture of the casing, a specially-assigned person is responsible for monitoring in the whole process, the inclined pile steel casing adopts a guide frame to control the inclination and uses a vibration hammer to lower the steel casing, if the steel casing is not completely lowered in place at one time, the casing is lengthened and followed in the drilling process, namely, the elevation of the bottom of the casing is 6m higher than that of the pile bottom.

During the punching process of the impact drilling, a steel protective cylinder is used for guiding during the impact drilling, 2/5 length of a cylinder-column type drill bit is always controlled in the steel protective cylinder during the drilling process, namely the overlap length of the drill bit in the steel protective cylinder is kept to be not less than 2m, the drop hammer height is noticed during punching, the normal value is 1-1.5m, the initial stroke is smaller, the stroke is gradually increased, the drill bit is stable during the drilling process when being lifted, and the steel protective cylinder is prevented from being collided; in the drilling process, continuous operation is carried out, a rock sample is checked at any time, in order to ensure the slurry performance and the stability of a hole wall, the slurry performance index is detected for 1 time every 2 hours, the slurry performance index is detected for 1 time every 1 hour within the range of upper and lower 2m at the bottom of the steel casing, if abnormal conditions exist, phase measures are immediately taken, and the slurry performance index is adjusted in time.

In settling the steel reinforcement cage in-process, the steel reinforcement cage is at the centralized machine-shaping in land production place, every section steel reinforcement cage length 9m, adjust according to the pile length simultaneously, hoop is strengthened at the steel reinforcement cage, every 3m equipartition sets up 6 leading wheels, the steel reinforcement cage outer lane sets up the protective layer cushion of sufficient quantity, ensure that the steel reinforcement cage is placed between two parties and perpendicular, the steel reinforcement cage is laid and is taken one's place the back, adopt 6 root phi 25mm reinforcing bars to weld steel reinforcement cage evenly distributed on steel protects a section of thick bamboo top, in case the steel reinforcement cage come-up when pouring concrete.

In the inclined pile concrete pouring process, a water tightness test (P is more than or equal to 0.75MPa) of a pipe connecting part is required before the pipes are placed, the concrete is ensured not to leak or separate in the blanking process, in order to ensure that the pipes are placed smoothly, the axial lines of the pipes are basically overlapped with the axial lines of steel casing cylinders (pile holes), and every three pouring pipes are provided with a section of rugby type pipe.

In the construction process of forming the inclined pile, if the rock face is inclined, a small-stroke hole is punched from top to bottom at the bottom opening of the steel casing, and the stroke is 0.5-0.8 m. Impacting the bottom opening of the steel casing, lifting the drill, throwing 50-60 cm high stones into the hole, impacting the bottom opening of the steel casing by 20-30 cm, throwing 50-60 cm high stones into the hole, and impacting. Repeating the steps until the rock surface is leveled, and normally impacting to form a hole after the full section of the drill bit enters the bedrock by 1 m;

in the punching process, if the situations of inclined holes, bent holes, plum blossom holes, collapsed holes, slurry leakage around the protective cylinder and the like occur, the construction operation is stopped, measures are taken, and then construction is carried out; except the soil layer capable of automatically making slurry, preparing slurry, wherein the slurry is prepared by selecting high-plasticity clay or bentonite according to the mix proportion;

and if the water head in the hole suddenly rises or suddenly drops, indicating hole collapse, immediately stopping drilling, repeatedly putting clay clamp block stones into the hole for backfilling, stopping slurry circulation, repeatedly impacting, and normally punching after the hole wall is stable.

The equipment and the construction method used by the invention can realize the aim of forming the inclined pile by impact drilling and combining the construction parameters set by the invention.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.