Anti-deviation construction device for drilling in soft and hard staggered stratum and cast-in-situ bored pile construction method

Abstract

The invention relates to the field of bridge foundation construction, in particular to an anti-deviation construction device for drilling in a soft and hard staggered stratum and a cast-in-situ bored pile construction method.The first aspect is that the anti-deviation construction device for drilling in the soft and hard staggered stratum comprises a positioning supporting frame surrounding a steel casing; the limiting device comprises more than three horizontal limiting fixing seats which are arranged at equal-angle intervals, and each limiting fixing seat is provided with a row of multiple limiting holes; the limiting pieces are arranged on the top surfaces of the limiting fixing seats one by one; the limiting piece comprises a hoop used for abutting against the steel casing and a pushing rod located at the tail of the hoop, the axis of the pushing rod is parallel to the circle center connecting line of the row of limiting holes, a positioning hole is formed in the tail of the pushing rod, and the positioning hole is matched with any limiting hole through a positioning rod. According to the anti-inclination construction device and the cast-in-situ bored pile construction method, the problem of inclined holes occurring in the drilling process of the bridge cast-in-situ bored pile in the soft and hard staggered stratum can be solved.

Description

Technical Field

[0001] The present invention relates to the field of bridge foundation construction, and particularly to an anti-deviation construction device for drilling in a soft-hard alternating stratum and a construction method for bored cast-in-place piles. Background Art

[0002] At present, bored cast-in-place piles have the advantages of wide applicable strata, high single-pile bearing capacity, and simple construction, and are widely used in the fields of bridges, water conservancy, electric power, and other engineering construction. However, due to the complexity of the strata, especially when the soil quality at the bottom of the hole is uneven, soft and hard rock strata alternate, the strength of the rock and soil layers varies greatly, and the rock layer surface is inclined, deviation of the hole often occurs during the drilling and hole-forming process, and the deviation of the hole mostly occurs at the contact surface between the soft soil layer and the deep inclined rock layer. If effective preventive measures are not taken, the deviation of the hole is not detected and corrected in time, it will cause great losses in the construction period and cost of bored cast-in-place piles.

[0003] In related technologies, in order to solve the problem of hole deviation easily occurring in the soft-hard alternating stratum, those skilled in the art set up a drilling rig and installed an angle sensor on the steel casing of the bored cast-in-place pile to ensure the verticality of the steel casing of the bored cast-in-place pile and detect the problem of hole deviation during the drilling and hole-forming process at any time.

[0004] However, the above method of installing the angle sensor still requires frequent inspection of the verticality of the drilling rig. When deviation occurs, it is necessary to correct the deviation in time. This is a technical solution for error correction after the event, and still requires a large amount of manpower and material resources to correct the angle. Summary of the Invention

[0005] The present application provides an anti-deviation construction device for drilling in a soft-hard alternating stratum and a construction method for bored cast-in-place piles, which can prevent the problem of hole deviation during the drilling of bored cast-in-place piles in the soft-hard alternating stratum.

[0006] In a first aspect, an embodiment of the present application provides an anti-deviation construction device for drilling in a soft-hard alternating stratum, including: a positioning support frame arranged to surround the steel casing, which includes more than three horizontal and equally angularly spaced limiting and fixing seats, and each of the limiting and fixing seats is provided with a row of a plurality of limiting holes;

[0007] Limiting members equal in number to the limiting and fixing seats, which are respectively arranged on the top surfaces of the limiting and fixing seats; the limiting members include a clamp for abutting against the steel casing and a top push rod located at the tail of the clamp, the axis of the top push rod is parallel to the center line connection of a row of limiting holes, and a positioning hole is arranged at the tail of the top push rod, and the positioning hole is matched with any one of the limiting holes through a positioning rod.

[0008] In combination with the first aspect, in an embodiment, the limiting member further includes two clamping members, and a sliding channel is formed between the two clamping members; the top push rod moves along the sliding channel to abut against and fix steel casings with different diameters.

[0009] In combination with the first aspect, in one embodiment, the limiting member further includes a box partition board, which vertically divides the sliding channel into two sections; the top push rod penetrates through the box partition board, and the top push rod is divided into a front section and a rear section by the box partition board; the width of the front section is equal to the width of the sliding channel; the width of the rear section is smaller than the width of the sliding channel.

[0010] In combination with the first aspect, in one embodiment, the positioning support frame includes an outer guiding frame, the outer guiding frame is rectangular, and is arranged around the steel casing; four limiting fixing seats are fixedly arranged at the four corners of the outer guiding frame.

[0011] In combination with the first aspect, in one embodiment, the positioning support frame further includes a plurality of triangular frames, the triangular frames are supported on the side surface of the outer guiding frame, the triangular frame includes an inclined strut and a horizontal rod, the top end of the inclined strut is fixedly arranged on the top side surface of the outer guiding frame; one end of the horizontal rod is fixedly arranged on the bottom side surface of the outer guiding frame; the bottom end of the inclined strut is joined to the other end of the horizontal rod, and a steel plate is arranged at the joining position, and the steel plate is fixed to the ground through anchor bolts.

[0012] In combination with the first aspect, in one embodiment, the limiting member further includes a plurality of shims, and the plurality of shims are filled between the rear end face of the clamp and the front end face of the clamping member.

[0013] In the second aspect, the embodiment of the present application provides a construction method for bored cast-in-place piles, including the steps:

[0014] S1: Level the site and insert and bury the steel casing.

[0015] S2: Assemble the positioning support frame, and respectively install each limiting member to the corresponding limiting fixing seat to form the anti - inclination construction device as described in claim 1; hoist and lower the anti - inclination construction device as a whole, and the steel casing passes through it; the steel casing 1 is located at the center position.

[0016] S3: Insert and fix the bottom of the positioning support frame to the ground through anchor bolts, adjust the limiting member, and all abut and position the steel casing.

[0017] S4: Drill holes with a drilling rig and carry out the construction of cast - in - place piles.

[0018] S5: Pull out the anchor bolts, and the crane removes the anti - inclination construction device.

[0019] In combination with the second aspect, in one embodiment, in step S2, the positioning support frame is welded by a horizontal rod, an inclined rod and a vertical rod; the upper horizontal rod and the inclined rod are welded by double-channel steel, the vertical rod is welded by double-channel I32a steel, and the bottom horizontal rod is I25b steel; stiffening plates are welded at the joints of each horizontal rod, inclined rod and vertical rod for reinforcement.

[0020] In combination with the second aspect, in one embodiment, the positioning support frame includes an outer frame of the guiding frame, and the outer frame of the guiding frame is rectangular and is arranged around the steel casing; in step S2, four limit fixing seats are welded at the four corners of the outer frame of the guiding frame, and four limit members are respectively fixed on the top surfaces of the four limit fixing seats.

[0021] In combination with the second aspect, in one embodiment, in step S2, a rectangular steel plate is welded at the bottom of the positioning support frame, and bolt holes are reserved on the rectangular steel plate;

[0022] In step S3, anchor bolts are inserted through the bolt holes;

[0023] In step S5, the crane removes the anti-inclination construction device, and the crane is also used to pull out the steel casing.

[0024] The beneficial effects brought by the technical solution provided by the embodiment of the present application at least include:

[0025] 1. For the anti-inclination construction device of the present application, by setting a positioning support frame, setting limit fixing seats on the positioning support frame, and then setting limit members on the upper surface of the limit fixing seats, multiple limit members cooperate with each other to be able to play a role in supporting and positioning the steel casing, preventing the steel casing from tilting during subsequent drilling, and multiple limit members form a strong supporting effect, which can prevent the problem of inclined holes during the drilling process of bridge bored piles in soft-hard alternating strata; further, the positioning holes at the tail of the top push rod are matched with a row of multiple limit holes through the positioning rod, which can be adapted to steel casings of various different diameters, with a wide application range and strong practicability. The anti-inclination construction device of the present application solves the problem of inclined holes during the insertion of bored piles under the geological conditions of soft-hard alternation and undulating bottom layers, ensures the construction quality, and makes the construction more efficient and convenient.

[0026] 2. For the anti-inclination construction device of the present application, the box partition divides the sliding channel into two sections, and the top push rod is also divided into a front section and a rear section. The width of the front section is basically equal to the width of the sliding channel, forming a basis for stable sliding, and the width of the rear section is less than the width of the sliding channel, forming a basis for flexible movement, which can achieve flexible matching and stable support to achieve the anti-inclination effect.

[0027] 3. The construction method of the bored cast-in-place pile of the present application is to first assemble the above anti-inclination construction device, then hoist it as a whole downward and make the steel casing located in the center position; fix it as a whole on the ground, hold and position the steel casing, and complete the construction of the bored cast-in-place pile; then remove the ground fixation and hoist and move away the anti-inclination construction device as a whole. This can not only ensure the efficient completion of the bored cast-in-place pile, but also effectively prevent the problem of inclined holes; at the same time, when the steel casing is located in the center position, the overall structure is more reasonably and stably stressed during the insertion process; further, due to the adjustability of the push rod of the limiting member, the limiting member can be adjusted forward and backward through the push rod according to the diameter of the steel casing, and it can be applied to the construction of bored cast-in-place piles with various diameters, bringing great convenience to the construction, having strong adaptability and remarkable economic benefits; moreover, after the construction is completed, it can be hoisted as a whole to other positions, fixed on the ground again, and reused efficiently. While improving the construction quality, it also improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a top view of the anti-inclination construction device provided by the embodiment of the present application;

[0030] Figure 2 is Figure 1 the bottom view of;

[0031] Figure 3 is Figure 1 the left view of;

[0032] Figure 4 It is a schematic structural diagram of the limiting member provided by the embodiment of the present application;

[0033] Figure 5 is Figure 4 the bottom view of;

[0034] In the figure: 1, steel casing; 2, outer frame of the guiding frame; 3, stiffening plate; 4, tripod; 5, steel plate; 6, limiting fixing seat; 7, limiting member; 8, anchor bolt; 71, clamping member; 72, clamp; 73, push rod; 74, leveling pad; 75, box partition; 76, positioning rod; 731, positioning hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0036] This application provides an anti-deviation construction device for drilling in hard and soft alternating strata, providing a solution during the process, which can prevent the problem of inclined holes during the drilling of bored cast-in-place piles in hard and soft alternating strata; compared with the prior art that corrects the inclination after it occurs, it is more efficient and convenient.

[0037] Specifically, when constructing bored cast-in-place piles under geological conditions where the strata are hard and soft alternating and the strata dip angle is large, during the drilling process of the drill rig, the disturbance of the drill rig is very likely to cause the steel casing to tilt, which in turn affects the pile forming quality and causes difficulties in subsequent construction, such as being unable to insert the steel reinforcement cage. This adjustable anti-deviation hole construction device for drilling in hard and soft strata limits and fixes the steel casing during the drilling process, avoiding the tilt of the steel casing and the occurrence of inclined hole problems, ensuring the construction quality and accelerating the construction progress. At the same time, the limiters inside the guide frame can be adjusted according to the diameter of the steel casing, so it is applicable to the construction of bored cast-in-place piles of various sizes, realizing recycling, reducing costs, greatly improving economic benefits, and achieving both production and conservation. It has great reference value for the construction of bored cast-in-place piles in hard and soft alternating strata.

[0038] In the first aspect, as Figures 1 to 5 shown, this application discloses an embodiment of an anti-deviation construction device for drilling in hard and soft alternating strata. The anti-deviation construction device includes a positioning support frame and a number of limiters 7.

[0039] Among them, the positioning support frame is arranged around the circumference of the steel casing 1. The positioning support frame includes more than three horizontally and equally angularly spaced limit fixing seats 6. Each limit fixing seat 6 is provided with a row of multiple limit holes to provide a structural basis for installing the limiters 4.

[0040] The number of limiters 7 is the same as that of the limit fixing seats 6. The limiters 7 are respectively arranged on the top surfaces of the limit fixing seats 6. The limiter 7 includes a clamp 72 and a top push rod 73. Among them, the clamp 72 is used to abut against the outer circumferential surface of the steel casing 1. The top push rod 73 is located at the tail of the clamp 72. The axis of the top push rod 73 is parallel to the connecting line of the centers of a row of limit holes. A positioning hole 731 is provided at the tail of the top push rod 73, and the positioning hole is matched with any limit hole through a positioning rod 76.

[0041] The anti - inclination construction device of the present application, by setting a positioning support frame, a limit fixing seat 6 is set on the positioning support frame, and then a limiting member 7 is set on the upper surface of the limit fixing seat 6. Multiple limiting members 7 cooperate with each other to play a role in supporting and positioning the steel casing 1, preventing the steel casing 1 from tilting during subsequent drilling, and multiple limiting members 7 form an effect of strong supporting and holding, which can prevent the problem of inclined holes during the drilling process of bridge bored piles in the soft - hard alternating strata; furthermore, the positioning hole 731 at the tail of the top push rod 73 matches a row of multiple limiting holes through the positioning rod 76, which can be adapted to steel casings 1 of a variety of different diameters, with a wide application range and strong practicability.

[0042] As Figure 4 and Figure 5 shown, the limiting member 7 further includes two clamping members 71, and a sliding channel is formed between the two clamping members 71. The top push rod 73 moves along the sliding channel to support and fix the steel casing 1 of different diameters.

[0043] In the anti - inclination construction device of the present application, the top push rod 73 slides along the sliding channel, so that the positioning hole at the tail of the top push rod 73 can be aligned with different limiting holes, realizing flexible matching.

[0044] Furthermore, the limiting member 7 further includes a box partition 75. The box partition 75 vertically divides the sliding channel into two sections; the top push rod 73 penetrates through the box partition 75, and the top push rod 73 is divided into a front section and a rear section by the box partition 75; the width of the front section is equal to the width of the sliding channel; the width of the rear section is less than the width of the sliding channel.

[0045] In the anti - inclination construction device of the present application, the box partition 75 divides the sliding channel into two sections, and the top push rod 73 is also divided into a front section and a rear section. The width of the front section is basically equal to the width of the sliding channel, forming a basis for stable sliding, while the width of the rear section is less than the width of the sliding channel, forming a basis for flexible movement, which can realize flexible matching and stable support, achieving the anti - inclination effect.

[0046] As Figure 2 and Figure 3 shown, the positioning support frame includes a guide frame outer frame 2. The guide frame outer frame 2 is rectangular and is framed around the steel casing 1 to form a basis for support. Four limit fixing seats 6 are fixedly arranged at the four corners of the guide frame outer frame 2, and four limiting members are arranged on the four limit fixing seats 6 to achieve the purpose of anti - inclination.

[0047] Specifically, each limit fixing seat 6 is composed of two steel plates with a plane size of 1373mm×1373mm and a thickness of 10mm. Each steel plate is reserved with 8 bolt holes for installing the limiting member. After the limit fixing seat 6 is welded, the limiting member is fixed to the limit fixing seat by 8 bolts. The limit fixing seat 6 formed by double - layer steel plates ensures the weld length, and the bolt design is convenient for the installation, disassembly and maintenance of the limiting member.

[0048] Furthermore, the positioning support frame further includes a plurality of triangular frames 4. The triangular frames 4 are supported and arranged on the side surface of the outer frame 2 of the guiding frame. The triangular frame 4 includes a diagonal brace and a horizontal bar. The top end of the diagonal brace is fixed to the top side surface of the outer frame 2 of the guiding frame. One end of the horizontal bar is fixed to the bottom side surface of the outer frame 2 of the guiding frame. The bottom end of the diagonal brace is joined to the other end of the horizontal bar, and a steel plate 5 is arranged at the joint. The steel plate 5 is fixed to the ground through anchor bolts 8.

[0049] Specifically, after the positioning support frame is adjusted and positioned, a total of 16 M36 anchor bolts in four groups are respectively driven in. The length of the part of the anchor bolt inserted into the soil is 2 m, forming a stable support structure. After the driving is completed, the nuts are tightened.

[0050] In the anti - skew construction device of the present application, the anchor bolts 8 have a sufficient depth of insertion into the soil to ensure that the force meets the requirements, fix the positioning support frame, and ensure the overall stability performance of the positioning support frame.

[0051] Preferably, a plurality of stiffening plates 3 for reinforcement are arranged at each joint of the outer frame 2 of the guiding frame.

[0052] Furthermore, the limiting member 7 further includes a plurality of shims 74. The plurality of shims 74 are filled between the rear end face of the clamp 72 and the front end face of the clamping member 71.

[0053] In the anti - skew construction device of the present application, a plurality of shims 74 are arranged to be filled between the rear end face of the clamp 72 and the front end face of the clamping member 71, so that there is no gap between the rear end face of the clamp 72 and the front end face of the clamping member 71, forming a complete structure, improving the stability of the whole structure, and further improving the anti - skew performance.

[0054] In a second aspect, the present application also discloses a construction method for bored cast - in - place piles, including the steps:

[0055] S1: Level the site and insert and bury the steel casing 1.

[0056] S2: Assemble the positioning support frame, and respectively install each limiting member 7 to the corresponding limiting fixing seat 6 to form the above - mentioned anti - skew construction device; hoist and lower the anti - skew construction device as a whole, and let the steel casing 1 pass through it. Specifically, make the steel casing 1 in the center position.

[0057] S3: Fix the bottom of the positioning support frame to the ground by driving in anchor bolts, adjust the limiting member 7, and make it all abut against the positioning steel casing.

[0058] Due to the adjustability of the push rod of the limiting member 7, it can be applied to the construction of bored cast - in - place piles with various diameters, bringing great convenience to the construction and having strong adaptability.

[0059] S4: Drill with a drill rig and carry out the construction of cast - in - place piles.

[0060] S5: After the construction of the cast-in-place pile is completed, pull out the anchor bolts, and the crane removes the anti-inclination construction device, which can be reused.

[0061] For the construction method of the bored cast-in-place pile in this application, first assemble the above anti-inclination construction device, then hoist it as a whole below, and make the steel casing 1 located in the center position; fix it as a whole on the ground, hold the positioning steel casing, and complete the construction of the bored cast-in-place pile; then remove the ground fixation, hoist and remove the anti-inclination construction device as a whole, which can not only ensure the efficient completion of the bored cast-in-place pile, but also effectively prevent the problem of inclined holes; at the same time, when the steel casing 1 is located in the center position, the overall structure is more reasonable and stable in the process of inserting and driving; further, due to the adjustability of the push rod of the limiting member 7, it can be applied to the construction of bored cast-in-place piles with various diameters, bringing great convenience to the construction, with strong adaptability, and after the construction is completed, it can be hoisted as a whole to other positions, fixed on the ground again, and reused efficiently, improving the construction quality while also improving the construction efficiency.

[0062] In one embodiment, in step S2, the positioning support frame is welded by horizontal bars, diagonal bars and vertical bars; the upper horizontal bar and the diagonal bar are welded by double-ply steel sections, the vertical bar is welded by double-ply I32a steel sections, and the bottom horizontal bar is I25b steel section; stiffening plates 3 are welded at the joints of each horizontal bar, diagonal bar and vertical bar for reinforcement.

[0063] Preferably, 10mm stiffening plates with different sizes are welded at the joints of each member.

[0064] Specifically, the positioning support frame has a total of two layers of horizontal bars, namely the upper horizontal bar and the lower horizontal bar.

[0065] The positioning support frame selects different types of steel sections according to the actual stress conditions of each member of the outer frame of the guide frame, and steel plates with different sizes are welded at the joints of each member, making the structure more reasonable in force, ensuring the structure is safer in force, saving steel, and improving economic benefits.

[0066] In one embodiment, the positioning support frame includes the outer frame 2 of the guide frame, and the outer frame 2 of the guide frame is rectangular and is arranged around the steel casing 1.

[0067] In step S2, four limit fixing seats 6 are welded at the four corners of the outer frame 2 of the guide frame, and four limiting members are respectively fixed on the top surfaces of the four limit fixing seats 6.

[0068] Specifically, each limit fixing seat 6 is composed of two upper and lower steel plates with a plane size of 1373mm×1373mm and a thickness of 10mm, and 8 bolt holes are reserved on each steel plate for installing the limiting member. After the limit fixing seat 6 is welded, the limiting member is fixed on the limit fixing seat by 8 bolts.

[0069] In step S2, a rectangular steel plate is welded to the bottom of the positioning support frame, and bolt holes are reserved on the rectangular steel plate to expand the fixed support surface.

[0070] Preferably, 450×400mm steel plates are welded to the ends of the grounding horizontal bars at the bottom layer of the outer frame of the guiding frame, and anchor bolt holes are reserved on each steel plate with a thickness of 16mm.

[0071] In step S3, through the bolt holes, anchor bolts 8 are inserted and driven to form a stable fixation with the ground. Specifically, after the positioning support frame is adjusted and positioned, a total of 16 M36 anchor bolts in four groups are respectively driven in. The length of the part of the anchor bolt inserted into the soil is 2m to form a stable support structure. After the driving is completed, the nuts are tightened.

[0072] In step S5, the crane removes the anti - inclination construction device and also uses the crane to pull out the steel casing.

[0073] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0074] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0075] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An anti-deviation construction device for drilling in a formation with alternating hard and soft layers, characterized in that Comprising: A positioning support frame arranged around the steel casing (1), which comprises more than three horizontally arranged and equally angularly spaced limit fixing seats (6), and each of the limit fixing seats (6) is provided with a row of a plurality of limit holes; Limit members (7) equal in number to the limit fixing seats (6), which are respectively arranged on the top surfaces of the limit fixing seats (6); the limit members (7) comprise a clamp (72) for abutting against the steel casing (1) and a top push rod (73) located at the tail of the clamp (72), the axis of the top push rod (73) is parallel to the center line connecting the centers of a row of limit holes, a positioning hole (731) is arranged at the tail of the top push rod (73), and the positioning hole is matched with any one of the limit holes through a positioning rod (76).

2. The anti-deviation construction device for drilling in hard and soft alternating strata according to claim 1, characterized in that: The limit member (7) further comprises two clamping members (71), and a sliding channel is formed between the two clamping members (71); the top push rod (73) moves along the sliding channel to abut against and fix steel casings (1) with different diameters.

3. The anti-deviation construction device for drilling in a hard-soft alternating formation according to claim 1, characterized in that: The limit member (7) further comprises a box partition plate (75), and the box partition plate (75) vertically divides the sliding channel into two sections; the top push rod (73) penetrates through the box partition plate (75), and the top push rod (73) is divided into a front section and a rear section by the box partition plate (75); the width of the front section is equal to the width of the sliding channel; the width of the rear section is smaller than the width of the sliding channel.

4. The anti-deviation construction device for drilling in a hard-soft alternating formation according to claim 1, characterized in that: The positioning support frame comprises an outer frame of a guiding frame (2), and the outer frame of the guiding frame (2) is rectangular and is arranged around the steel casing (1); four limit fixing seats (6) are fixedly arranged at the four corners of the outer frame of the guiding frame (2).

5. The anti-deviation construction device for drilling in a hard-soft alternating formation according to claim 4, characterized in that: The positioning support frame further comprises a plurality of triangular frames (4), and the triangular frames (4) are supported on the side surfaces of the outer frame of the guiding frame (2). The triangular frames (4) comprise inclined struts and horizontal rods. The top ends of the inclined struts are fixedly arranged on the top side surfaces of the outer frame of the guiding frame (2); one end of the horizontal rod is fixedly arranged on the bottom side surface of the outer frame of the guiding frame (2); the bottom ends of the inclined struts are joined to the other end of the horizontal rod, and a steel plate (5) is arranged at the joining part, and the steel plate (5) is fixed to the ground through anchor bolts (8).

6. The anti-deviation construction device for drilling in a soft-hard alternating formation according to claim 2, characterized in that: The limit member (7) further comprises a plurality of shim pads (74), and the plurality of shim pads (74) are filled between the rear end face of the clamp (72) and the front end face of the clamping member (71).

7. A construction method for bored cast-in-place piles, characterized in that, Comprising steps: S1: Level the site and insert and bury the steel casing (1); S2: Assemble the positioning support frame, and respectively install each limit member (7) to the corresponding limit fixing seat (6) to form the anti - inclination construction device as described in claim 1; hoist and lower the anti - inclination construction device as a whole, and let the steel casing pass through it; the steel casing 1 is in the central position; S3: Insert and fix the bottom of the positioning support frame to the ground through anchor bolts, adjust the limit members (7), and all abut against and position the steel casing; S4: Drill holes with a drilling rig and carry out cast - in - place pile construction; S5: Pull out the anchor bolts and use a crane to remove the anti - inclination construction device.

8. A construction method of bored cast-in-place piles according to claim 7, characterized in that: In step S2, the positioning support frame is welded by a horizontal rod, an inclined rod and a vertical rod; the upper horizontal rod and the inclined rod are welded by double-rolled steel, the vertical rod is welded by double-rolled I32a steel, and the bottom horizontal rod is I25b steel; stiffening plates (3) are welded at the joints of the horizontal rods, inclined rods and vertical rods for reinforcement.

9. The construction method of a bored cast-in-place pile according to claim 7, characterized in that: The positioning support frame includes an outer frame of the guide frame (2), and the outer frame of the guide frame (2) is rectangular and is arranged around the steel casing (1); in step S2, four limit fixing seats (6) are welded at the four corners of the outer frame of the guide frame (2), and four limit members are respectively fixed on the top surfaces of the four limit fixing seats (6).

10. A construction method of bored cast-in-place pile according to claim 7, characterized in that: In step S2, a rectangular steel plate is welded at the bottom of the positioning support frame, and bolt holes are reserved on the rectangular steel plate; In step S3, anchor bolts (8) are inserted through the bolt holes; In step S5, the crane removes the anti-deviation construction device, and the crane is also used to pull out the steel casing.

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