Rotary excavating cast-in-situ bored pile construction structure

Abstract

The utility model discloses a rotary excavating cast-in-situ bored pile construction structure, which belongs to the technical field of pile foundation engineering, and comprises a steel casing arranged at the upper end of a ground structure and a pile body arranged in the steel casing and penetrating into the ground structure, and the pile body comprises a reinforcement cage structure formed by a plurality of vertical reinforcements and a plurality of transverse reinforcements in a criss-cross manner. A positioning ring used for limiting a pile body is clamped to the steel casing, the upper ends of the multiple vertical steel bars protrude out of the positioning ring, the multiple vertical steel bars and the multiple transverse steel bars are fixedly connected at the staggered connection positions through a butt clamp assembly, each butt clamp assembly is composed of an outer clamping sleeve, an inner clamping sleeve, a connecting bolt, a pre-tightening spring and a connecting nut, the outer clamping sleeves are clamped to the outer sides of the transverse steel bars, and the inner clamping sleeves are clamped to the outer sides of the transverse steel bars. The inner clamping sleeve is clamped on the inner side of the vertical steel bar, and the outer clamping sleeve and the inner clamping sleeve are fixedly connected through a group of connecting bolts, pre-tightening springs and connecting nuts which are respectively arranged at four corners after the outer clamping sleeve and the inner clamping sleeve are butted. According to the construction structure, the stability and the structural strength of the vertical steel bars and the transverse steel bars during assembly can be ensured, the tightness of steel bar connection is improved through the action of the pre-tightening springs, and the connection parts are prevented from loosening in the concrete pouring and subsequent construction processes.

Description

Technical Field

[0001] The utility model belongs to the technical field of pile foundation engineering, and provides a construction structure for bored cast-in-place piles with rotary drilling rigs. Background Technique

[0002] The technique of bored cast-in-place piles with rotary drilling rigs is one of the key construction methods for foundation reinforcement and high-rise building support in modern civil engineering. Compared with traditional precast piles, bored cast-in-place piles with rotary drilling rigs can better adapt to complex geological conditions and provide higher bearing capacity and structural stability. The core of this technique lies in drilling holes at predetermined positions by a drilling rig, then placing a pre-assembled steel reinforcement cage, and pouring concrete, finally forming a high-strength pile body to support the load of the upper structure.

[0003] Among them, the assembly of traditional steel reinforcement cages usually adopts welding or binding methods, which are not only inefficient but also difficult to ensure the structural stability of the steel reinforcement cages in complex construction environments. In addition, the positioning and fixation of the steel reinforcement cages are the key to ensuring the quality of cast-in-place piles. Traditional positioning methods such as hoisting and manual adjustment often have problems of inaccurate positioning and insecure fixation, which may lead to the displacement of steel bars during the concrete pouring process and affect the structural performance of the pile body.

[0004] Concrete pouring is an important link in the construction of bored cast-in-place piles with rotary drilling rigs, and its quality directly affects the bearing capacity and durability of the pile body. In traditional concrete pouring methods, the positioning of the pouring conduit and the control during the concrete pouring process are the key. During the concrete pouring process, it is easy to collide with the steel reinforcement cage, which may cause the displacement of the steel reinforcement cage and collision with the inner wall of the pile hole, resulting in the collapse of the soil on the inner wall of the pile hole and affecting the overall quality and performance of the pile body. Content of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a construction structure for bored cast-in-place piles with rotary drilling rigs to solve the problems that the assembly of traditional steel reinforcement cages usually adopts welding or binding methods, which are inefficient and difficult to ensure the structural stability of the steel reinforcement cages as mentioned in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model provides a construction structure for a rotary drilled cast-in-place pile, which includes a steel casing arranged at the upper end of a ground structure and a pile body arranged in the steel casing and extending into the ground structure. The pile body comprises a steel cage structure formed by a plurality of vertical steel bars circumferentially arranged and a plurality of horizontal steel bars arranged in layers along the length direction of the vertical steel bars, with the vertical and horizontal steel bars intersecting each other. A positioning ring for limiting the pile body is clamped on the steel casing. The upper ends of the plurality of vertical steel bars protrude out of the positioning ring. The plurality of vertical steel bars and the plurality of horizontal steel bars are fixedly connected through a set of clamping components at the intersection. The clamping component consists of an outer clamping sleeve, an inner clamping sleeve, a connecting bolt, a pre-tightening spring, and a connecting nut. Among them, the outer clamping sleeve is clamped outside the horizontal steel bar, the inner clamping sleeve is clamped inside the vertical steel bar, and the outer clamping sleeve and the inner clamping sleeve are fixedly connected through a set of connecting bolts, pre-tightening springs, and connecting nuts arranged at the four corners after docking. The connecting bolt sequentially passes through the outer clamping sleeve and the inner clamping sleeve and is fixedly connected to the connecting nut, and the pre-tightening spring is sleeved on the connecting bolt. With the above scheme, in the construction structure of the rotary drilled cast-in-place pile, under the action of the pre-tightening spring of the connecting bolt, the positions of the vertical steel bars and the horizontal steel bars can be finely adjusted to ensure their uniform distribution, effectively improving the overall mechanical properties of the pile body, ensuring that it meets the construction requirements, solving multiple problems in the assembly of traditional steel cages, significantly improving the construction efficiency, structural stability, and pile body quality, and providing more reliable technical support for the construction of civil engineering.

[0008] Optionally, a pre-tightening groove for installing a pre-tightening piece is opened at one end of the outer clamping sleeve away from the horizontal steel bar. The pre-tightening piece is sleeved on the connecting bolt. A spring groove for installing the pre-tightening spring is communicated with one end of the pre-tightening groove close to the horizontal steel bar, and the pre-tightening spring abuts against the pre-tightening piece. An accommodating inner groove for accommodating the connecting nut is opened at one end of the inner clamping sleeve away from the vertical steel bar. The connecting bolt is an inner hexagon screw. In this way, not only the overall stability and safety of the construction structure of the rotary drilled cast-in-place pile are improved, but also the construction structure is optimized and the construction efficiency is increased.

[0009] Optionally, anti-slip grooves are arranged on the inner wall of one end of the outer clamping sleeve close to the horizontal steel bar and the inner wall of one end of the inner clamping sleeve close to the vertical steel bar. These anti-slip grooves can effectively prevent the steel bars from sliding or displacing during concrete pouring or subsequent construction by increasing the friction force of the contact surface, ensuring that the steel bars can maintain a fixed position during connection, thereby improving the connection stability.

[0010] Optionally, the lower end of the positioning ring is provided with a plurality of radially distributed positioning blocks, and the upper end of the steel casing is provided with a plurality of positioning slots that are respectively connected to the plurality of positioning blocks in a one-to-one manner. In this way, through the cooperation between the positioning blocks and the positioning slots, accurate positioning can be achieved to prevent the pile body from shifting during the construction process; additional lateral support force can also be provided to enhance the stability of the pile body. At the same time, through this clamping design, construction personnel can more quickly and conveniently complete the positioning and fixing of the steel cage during the assembly and installation process, so that the simplified operation process can reduce construction time and improve construction efficiency.

[0011] Optionally, a plurality of fixed cross bars are fixedly connected to the inner wall of the positioning ring, a casting ring is fixedly connected in the middle of the plurality of fixed cross bars, and the plurality of fixed cross bars are provided with steel cage positioning grooves that penetrate up and down, and a plurality of vertical steel bars are respectively inserted into the plurality of steel cage positioning grooves in a one-to-one correspondence. In this way, the provision of a plurality of fixed cross bars can provide additional lateral support for the steel cage structure, increase the stability of the entire structure, and effectively prevent the steel cage structure from being displaced due to the flow and vibration of concrete. The casting ring provides a convenient access channel for the pouring of concrete, making the pouring operation smoother, and the presence of the casting ring can help construction personnel better control the flow and distribution of concrete and ensure the uniformity of the pile body.

[0012] Optionally, at least one relatively fixed cross bar on the positioning ring is provided with a hook assembly for lifting and hanging a certain layer of horizontal steel bars on the upper part of the pile body, and the hook assembly is composed of a fixed seat, a height adjustment clamping rod, and a fixed hook plate, wherein the fixed seat is mounted on the fixed cross bar, and the fixed seat is provided with two height adjustment clamping rods symmetrically relative to the two sides of the fixed cross bar, and the two height adjustment clamping rods are connected to the fixed hook plate for lifting and hanging the horizontal steel bars at the ends away from the fixed seat. In this way, through the hook assembly, construction personnel can quickly and conveniently lift and hang the horizontal steel bars at an appropriate height, thereby reducing the time consumption and labor costs in the traditional manual adjustment process, effectively improving construction efficiency, and shortening the construction period. At the same time, the design of the hook assembly enables the horizontal steel bars to be maintained at a precise height position during the pouring process, preventing position deviation caused by vibration or movement during the construction process.

[0013] Optionally, the fixed seat is slidably connected to the fixed cross bar, and a fixed knob is connected to the fixed seat through an internal thread, and a locking block is fixedly connected to the lower end of the fixed knob, and the lower end of the locking block is used to fit tightly against the upper end of the fixed cross bar. An unlocking slide hole is provided on the fixed seat, and the locking block is slidably connected inside the unlocking slide hole. In this way, when fixing is required, the fixed knob is rotated to make the locking block fit tightly against the upper end of the fixed cross bar, thereby achieving a stable locking of the fixed seat to prevent displacement; and when adjustment is required, the fixed knob is easily unlocked, and the fixed seat can be adjusted by sliding. This design simplifies the adjustment process and makes construction more efficient.

[0014] Optionally, at least one outer side wall of the fixed seat is provided with a locking bolt and a locking nut for adjusting the displacement of the height-adjusting clamping rod relative to the fixed seat, and the locking nut is arranged close to the outer side wall of the fixed seat. Through the adjustment of the locking nut, the vertical position of the height-adjusting clamping rod can be stably locked, preventing the accidental sliding of the height-adjusting clamping rod during construction and ensuring the stability of the horizontal steel bar. And the construction workers can quickly unlock and adjust when needed without using tools, greatly improving the operation convenience.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. Connection form of the outer jacket and the inner jacket: The outer jacket and the inner jacket are fixedly connected by connecting bolts and connecting nuts to ensure the stability and structural strength of the vertical steel bar and the horizontal steel bar during assembly.

[0017] 2. Pre-tightening mechanism: The use of the pre-tightening spring and the pre-tightening pressing piece improves the tightness of the steel bar connection through the pre-tightening effect, preventing the loosening of the connection part during concrete pouring and subsequent construction.

[0018] 3. Positioning ring positioning technology: The positioning ring and the steel casing are matched through positioning blocks and positioning grooves to ensure the accurate positioning of the steel reinforcement cage in the pile hole and improve the structural stability.

[0019] 4. Steel reinforcement cage positioning and adjustment technology: The steel reinforcement cage positioning groove on the fixed cross bar and the fixed seat are matched with the height-adjusting clamping rod and the fixed hook plate to realize the height adjustment and position fixation of the steel reinforcement cage, ensuring that the steel reinforcement cage is coaxial with the pile hole and meeting the construction accuracy requirements.

[0020] 5. Pouring ring positioning: The setting of the pouring ring ensures the central position of the pouring conduit during concrete pouring, avoiding the contact between the conduit and the steel reinforcement cage and ensuring the concrete pouring quality.

[0021] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail and preferably in conjunction with the accompanying drawings, where:

[0023] Figure 1 is the front view schematic diagram of the construction structure of the rotary drilling cast-in-place pile of the present utility model;

[0024] Figure 2Schematic diagram of the connection of the steel casing for the construction structure of the rotary drilling cast-in-place pile of the present utility model;

[0025] Figure 3 Schematic diagram of the connection of the positioning ring for the construction structure of the rotary drilling cast-in-place pile of the present utility model;

[0026] Figure 4 Schematic diagram of the connection of the vertical steel bars for the construction structure of the rotary drilling cast-in-place pile of the present utility model;

[0027] Figure 5 is Figure 4 Enlarged schematic diagram of part A in

[0028] Figure 6 Schematic diagram of the connection of the fixed seat for the construction structure of the rotary drilling cast-in-place pile of the present utility model;

[0029] Figure 7 is Figure 6 Enlarged schematic diagram of part B in

[0030] Figure 8 is Figure 4 Enlarged schematic diagram of part C in

[0031] Figure 9 Schematic diagram of the connection of the connecting bolts for the construction structure of the rotary drilling cast-in-place pile of the present utility model;

[0032] Figure 10 is Figure 9 Enlarged schematic diagram of part D in

[0033] Figure 11 is Figure 9 Enlarged schematic diagram of part E in

[0034] Reference numerals: 1 - ground structure; 2 - pile body; 3 - steel casing; 4 - positioning ring; 5 - vertical steel bars; 6 - horizontal steel bars; 7 - outer jacket; 8 - inner jacket; 9 - fixed cross bar; 10 - pouring ring; 11 - steel cage positioning groove; 12 - positioning block; 13 - positioning groove; 14 - fixed seat; 15 - height adjusting clamping rod; 16 - fixed hook plate; 17 - fixed knob; 18 - locking abutment block; 19 - unlocking sliding hole; 20 - locking bolt; 21 - locking nut; 22 - connecting bolt; 23 - pre-tightening groove; 24 - spring groove; 25 - pre-tightening spring; 26 - pre-tightening pressing piece; 27 - receiving inner groove; 28 - connecting nut; 29 - anti-slip groove. Detailed implementation manners

[0035] The present utility model will be further described below in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation on this patent; in order to better illustrate the embodiments of the present utility model, some components in the attached drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0036] As Figure 1-11As shown in the figure, a construction structure of a rotary drilled cast-in-place pile mentioned in the present utility model includes a steel casing 3 arranged at the upper end of a ground structure 1 and a pile body 2 arranged inside the steel casing 3 and extending into the ground structure 1, which effectively protects the stability of the pile hole during construction. The pile body 2 includes a steel cage structure formed by a plurality of vertical steel bars 5 circumferentially distributed and a plurality of horizontal steel bars 6 arranged in layers along the length direction of the vertical steel bars 5 in a crisscross pattern, which can improve the bearing capacity and tensile strength of the pile body 2 and ensure the stability during concrete pouring and subsequent use. A positioning ring 4 for limiting the pile body 2 is clamped on the steel casing 3, which plays a limiting role to ensure that the pile body 2 does not displace during pouring; the upper ends of the plurality of vertical steel bars 5 protrude outside the positioning ring 4, further ensuring the height of the pile body 2 and the stability of the overall structure. The plurality of vertical steel bars 5 and the plurality of horizontal steel bars 6 are fixedly connected through a set of clamping components at the intersection. The clamping component is composed of an outer clamping sleeve 7, an inner clamping sleeve 8, a connecting bolt 22, a pre-tightening spring 25, and a connecting nut 28. Among them, the outer clamping sleeve 7 is clamped outside the horizontal steel bar 6, the inner clamping sleeve 8 is clamped inside the vertical steel bar 5, and the outer clamping sleeve 7 and the inner clamping sleeve 8 are fixedly connected through a set of connecting bolts 22, pre-tightening springs 25, and connecting nuts 28 respectively arranged at the four corners after docking, which can realize the firm connection between the vertical steel bar 5 and the horizontal steel bar 6; the design of the outer clamping sleeve 7 and the inner clamping sleeve 8 keeps the steel bars stable during assembly, effectively avoiding the instability caused by traditional welding or binding methods, that is, the connecting bolt 22 passes through the outer clamping sleeve 7 and the inner clamping sleeve 8 in sequence and is fixedly connected with the connecting nut 28, and the pre-tightening spring 25 is sleeved on the connecting bolt 22; a pre-tightening groove 23 for installing a pre-tightening piece 26 is opened at one end of the outer clamping sleeve 7 away from the horizontal steel bar 6, the pre-tightening piece 26 is sleeved on the connecting bolt 22, a spring groove 24 for installing the pre-tightening spring 25 is communicated with one end of the pre-tightening groove 23 close to the horizontal steel bar 6, and the pre-tightening spring 25 abuts against the pre-tightening piece 26, which can provide continuous pressure during concrete pouring to ensure the fastening effect between the outer clamping sleeve and the inner clamping sleeve; a receiving inner groove 27 for accommodating the connecting nut 28 is opened at one end of the inner clamping sleeve 8 away from the vertical steel bar 5; the connecting bolt 22 is an inner hexagonal screw, which has better anti-torque ability and fixing effect. When the connecting bolt 22 is clamped into the inner part of the outer clamping sleeve 7, the connecting bolt 22 can be elastically connected inside the pre-tightening groove 23 through the pre-tightening spring 25 and the pre-tightening piece 26, and can pre-tighten between the outer clamping sleeve 7 and the inner clamping sleeve 8 through the elastic connection of the pre-tightening spring 25 and the pre-tightening piece 26, and can prevent the loosening between the connecting bolt 22 and the connecting nut at the same time, making the connection between the vertical steel bar 5 and the horizontal steel bar 6 more firm, and can adjust the positions of the vertical steel bar 5 and the horizontal steel bar 6 between the outer clamping sleeve 7 and the inner clamping sleeve 8 in the pre-tightening state to ensure the uniform distribution of the plurality of vertical steel bars 5 and the plurality of horizontal steel bars 6.During the process of connecting the outer jacket 7 and the inner jacket 8 by the connecting bolt 22 through the connecting nut 28, the connecting nut 28 can be inserted into the inner part of the inner jacket 8 through the receiving inner groove 27 inside the inner jacket 8, reducing the space occupied in the concrete and not affecting the concrete pouring volume. With the above solution, the outer jacket and the inner jacket are fixedly connected by the connecting bolt and the connecting nut, ensuring the stability and structural strength of the vertical steel bars and the horizontal steel bars during assembly. The common use of the pre-tightening spring and the pre-tightening pressing piece further improves the pre-tightening effect and the tightness of the steel bar connection, preventing loosening at the connection part during concrete pouring and subsequent construction; it can also be positioned inside the pile hole through the positioning ring to ensure that the structure of the cast pile meets the construction requirements.

[0037] In this embodiment, anti-slip grooves 28 are provided on the inner wall of one end of the outer jacket 7 close to the horizontal steel bar 6 and on the inner wall of one end of the inner jacket 8 close to the vertical steel bar 5. In this way, the setting of the anti-slip grooves 28 can form a more firm mechanical locking effect between the vertical steel bar 5 and the horizontal steel bar 6, enhancing the shear resistance and tensile resistance of the connection part, so that the vertical steel bar 5 and the horizontal steel bar 6 can prevent sliding inside the outer jacket 7 and the inner jacket 8 through the anti-slip grooves 28 provided on the inner walls of the outer jacket 7 and the inner jacket 8, ensuring the stability and reliability of the vertical and horizontal intersections in the steel cage structure.

[0038] In this embodiment, a plurality of radially distributed positioning blocks 12 are provided at the lower end of the positioning ring 4, and a plurality of positioning slots 13 are provided at the upper end of the steel casing 3, which are respectively and correspondingly clamped with the plurality of positioning blocks 12 one by one. After the steel cage is placed inside the pile hole, the positioning ring 4 can be clamped to the upper end of the steel casing 3 through the plurality of positioning blocks 12 and the plurality of positioning slots 13, and can be positioned with the steel casing 3 through the plurality of positioning blocks 12 and the plurality of positioning slots 13 to ensure the coaxiality of the steel casing 3 and the positioning ring 4.

[0039] In this embodiment, a plurality of fixed cross bars 9 are fixedly connected to the inner wall of the positioning ring 4, and a casting ring 10 is fixedly connected in the middle of the plurality of fixed cross bars 9. The setting of the casting ring 10 ensures the central position of the casting conduit during the concrete pouring process, avoids the contact between the casting conduit and the steel cage, so as to ensure the quality of concrete pouring; and the plurality of fixed cross bars 9 are all provided with steel cage positioning grooves 11 penetrating from top to bottom, and the plurality of vertical steel bars 5 are respectively inserted into the plurality of steel cage positioning grooves 11 in a one-to-one manner. When the plurality of vertical steel bars 5 are respectively inserted into the plurality of steel cage positioning grooves 11 and the positioning ring 4 is fixed, the steel cage structure can be fixed and adjusted by the plurality of fixed cross bars 9 arranged inside the positioning ring 4, and can be positioned by the steel cage positioning grooves 11 opened inside the fixed cross bars 9. Since the upper ends of the plurality of vertical steel bars 5 protrude outside the upper end of the positioning ring 4, and the steel cage is arranged in a columnar shape and corresponds one by one to the plurality of steel cage positioning grooves 11, when the upper ends of the plurality of vertical steel bars 5 are inserted into the plurality of steel cage positioning grooves 11, the steel cage can be made coaxial with the positioning ring 4 through the restriction of the inner walls of the plurality of steel cage positioning grooves 11, thereby positioning the steel cage.

[0040] In this embodiment, at least one relatively fixed cross bar 9 on the positioning ring 4 is provided with a hook assembly for lifting one, two or three layers of horizontal steel bars 6 on the upper part of the pile body 2, and the hook assembly is composed of a fixed seat 14, a height adjustment clamping rod 15, and a fixed hook plate 16, wherein the fixed seat 14 is mounted on the fixed cross bar 9 to ensure the stability and reliability of the hook assembly, and the fixed seat 14 is provided with two height adjustment clamping rods 15 symmetrical on both sides of the fixed cross bar 9, allowing construction personnel to adjust the height of the steel cage structure in the pile hole as needed, providing flexibility and being able to adapt to the requirements of different pile body designs and construction conditions. The two height adjustment clamping rods 15 are connected to the fixed hook plate 16 that lifts the horizontal steel bars 6 at the divergent ends away from the fixed seat 14, which can conveniently hang the horizontal steel bars 6 on the upper part of the pile body 2, thereby achieving stable suspension of the steel cage structure. In this way, the horizontal steel bars 6 on the upper side of the steel cage structure can be fixed and the height can be adjusted by the height adjusting clamping rod 15 and the fixed hook plate 16, and the height adjusting clamping rod 15 can clamp the steel cage by sliding the fixed seat 14 outside the fixed cross bar 9, and the height adjusting clamping rod 15 can slide up and down inside the fixed seat 14 so that the fixed hook plate 16 at the lower end of the height adjusting clamping rod 15 is hooked on the lower end of the vertical steel bars 5 on the upper side of the steel cage, and the height of the steel cage can be adjusted by sliding the height adjusting clamping rod 15, so that the steel cage can be fixed and the height can be adjusted.

[0041] In this embodiment, the fixed seat 14 is slidably connected to the fixed cross bar 9, enabling the fixed seat 14 to move freely on the fixed cross bar 9, thereby achieving flexible horizontal adjustment. A fixed knob 17 is connected to the fixed seat 14 through internal threads. The lower end of the fixed knob 17 is fixedly connected to a locking abutting block 18, and the lower end of the locking abutting block 18 is used to closely fit against the upper end of the fixed cross bar 9. An unlocking sliding hole 19 is formed in the fixed seat 14, and the locking abutting block 18 is slidably connected inside the unlocking sliding hole 19. In this way, after the reinforcing cage is clamped by multiple height-adjustable clamping rods 15 and fixed hook plates 16, the fixed seat 14 can rotate the fixed knob 17 downward to make the locking abutting block 18 at the lower end of the fixed knob 17 closely fit against the upper end of the fixed cross bar 9, thereby fixing the position of the fixed seat 14 and ensuring that the reinforcing cage can be firmly fixed inside the positioning ring 4.

[0042] In this embodiment, on one or two outer side walls of the fixed seat 14, there are provided a locking bolt 20 and a locking nut 21 for adjusting the displacement of the height-adjustable clamping rod 15 relative to the fixed seat 14, and the locking nut 21 is arranged close to the outer side wall of the fixed seat 14. In this way, after the height of the reinforcing cage structure is adjusted, the position of the height-adjustable clamping rod 15 can be fixed by the locking bolts 20 inside both ends of the fixed seat 14, and the position between the locking bolt 20 and the fixed seat 14 can be locked by the tight fit between the locking nut 21 and the outer walls at both ends of the fixed seat 14, ensuring that the height-adjustable clamping rod 15 is firmly fixed.

[0043] The specific construction process includes the following steps:

[0044] Step 1: Pile foundation positioning. According to the coordinates of the position where the pile body 2 is set, pile hole positioning is carried out on the upper end of the ground structure 1 to determine the drilling position, and the coordinates of the pile hole are measured by a total station or a theodolite.

[0045] Step 2: Bury the steel casing 3. Drill a burying hole for the steel casing 3 at the positioning place by a drill rig, and bury a steel casing 3 with a specified length into the hole, and make the upper end of the steel casing 3 protrude outside the upper end of the ground structure 1 by a specified length. The steel casing 3 should be buried straight, and the soil around it should be tamped. At the same time, the upper end of the steel casing 3 should be higher than the ground structure 1, and the central axis of the steel casing 3 should be on the drilling axis.

[0046] Step 3: Make a mud pit. A mud pit is opened on one side of the steel casing 3, and the slurry for protecting the wall is prepared inside the mud pit according to requirements, and the slurry for protecting the wall can be smoothly introduced into the steel casing 3. The slurry is introduced into the steel casing 3 by a slurry pump.

[0047] Step 4: Drilling. Drill a pile hole of a specified length downward at the center of the steel casing 3 with a drilling rig, and ensure that the pile hole is coaxial with the steel casing 3. During the drilling process, the slurry for shaft protection can enter the drilled pile hole through the steel casing 3 to support the inner wall of the pile hole and prevent the collapse of the inner wall of the pile hole. The slurry discharged from the drilling rig out of the pile hole is introduced into the slurry pit through a diversion pipeline for reuse to prevent the slurry from flowing around the construction site;

[0048] Step 5: Slag cleaning. After drilling a pile hole of a specified length, clean the soil slag deposited at the bottom of the pile hole to ensure that the soil slag inside the pile hole is cleaned up without affecting the concrete pouring volume;

[0049] Step 6: Place the steel reinforcement cage. Assemble multiple vertical steel bars 5 and multiple horizontal steel bars 6 through the outer jacket 7 and the inner jacket 8 to assemble a columnar steel reinforcement cage structure of a specified size. The steel reinforcement cage structure can be tightly connected together through the connecting bolts 22, pre-tightening springs 25, pre-tightening washers 26 and connecting nuts 28 between the outer jacket 7 and the inner jacket 8, making the connection of the steel reinforcement cage structure more firm. The anti-slip grooves 29 provided inside the inner walls of the outer jacket 7 and the inner jacket 8 can prevent the sliding between the vertical steel bars 5 and the horizontal steel bars 6 to ensure the stability of the steel reinforcement cage structure. Place the assembled steel reinforcement cage structure inside the pile hole, and position, fix and adjust the height through the positioning ring 4 at the upper end of the steel casing 3 to ensure that the steel reinforcement cage structure of the column is coaxial with the pile hole, and ensure that the heights of the upper and lower ends of the steel reinforcement cage structure meet the construction requirements. At the same time, ensure that the steel reinforcement cage structure can be firmly fixed inside the pile hole to prevent movement during the pouring process. The length and specifications of the steel reinforcement cage structure should be assembled according to the design requirements, and the steel reinforcement cage structure should be placed with a crane, and the placement depth should meet the construction requirements, and the position should be fixed in time;

[0050] Step 7: Pour concrete. Insert the pouring conduit into the pile hole, and position the pouring conduit through the pouring ring 10 so that the pouring conduit is located at the center inside the steel reinforcement cage, ensure that the pouring conduit is coaxial with the pile hole and the steel reinforcement cage, and adjust the height of the lower end of the pouring conduit to the height required by the construction. Then pour concrete into the pile hole. The conduit should be tested before insertion to ensure that there is no abnormality. When the concrete is initially poured, keep the distance between the lower end of the conduit and the bottom of the pile hole within half a meter;

[0051] Step 8: Remove the steel casing 3, positioning ring 4 and hook assembly. After the pouring is completed, remove the steel casing 3 and wait for the pile body 2 to completely solidify. Pull out the steel casing 3 from inside the ground structure 1 with a crane, and at the same time avoid damaging the pile body 2 by the steel casing 3.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. A rotary bored pile construction structure, comprising a steel casing (3) arranged at the upper end of a ground structure (1) and a pile body (2) arranged in the steel casing (3) and extending deep into the ground structure (1), wherein the pile body (2) comprises a steel cage structure composed of a plurality of vertical steel bars (5) arranged circumferentially and a plurality of horizontal steel bars (6) arranged in layers along the length direction of the vertical steel bars (5) in a crisscross pattern, characterized in that: A positioning ring (4) for limiting the pile body (2) is clamped on the steel casing (3), and the upper ends of the plurality of vertical steel bars (5) protrude outside the positioning ring (4). The plurality of vertical steel bars (5) and the plurality of horizontal steel bars are fixedly connected at the staggered joints by a set of clamping components, and the clamping components are composed of an outer jacket (7), an inner jacket (8), a connecting bolt (22), a preload spring (25), and a connecting nut (28), wherein the outer jacket (7) is clamped on the outer side of the horizontal steel bar (6), and the inner jacket (8) is clamped on the inner side of the vertical steel bar (5), and the outer jacket (7) and the inner jacket (8) are fixedly connected by a set of connecting bolts (22), a preload spring (25) and a connecting nut (28) respectively arranged at the four corners after the two are connected, and the connecting bolt (22) passes through the outer jacket (7) and the inner jacket (8) in sequence and is fixedly connected to the connecting nut, and the preload spring (25) is sleeved on the connecting bolt (22).

2. The rotary bored pile construction structure according to claim 1 is characterized in that: The outer jacket (7) is provided with a pre-tightening groove (23) for installing a pre-tightening plate (26) at one end away from the horizontal reinforcement (6); the pre-tightening plate (26) is sleeved on the connecting bolt (22); the pre-tightening groove (23) is connected to a spring groove (24) for installing a pre-tightening spring (25) at one end close to the horizontal reinforcement (6), and the pre-tightening spring (25) is against the pre-tightening plate (26); the inner jacket (8) is provided with a receiving inner groove (27) for accommodating a connecting nut (28) at one end away from the vertical reinforcement (5); the connecting bolt (22) is a hexagon socket screw.

3. The rotary bored pile construction structure according to claim 1 is characterized in that: The inner wall of the outer jacket (7) at one end close to the horizontal steel bar (6) and the inner wall of the inner jacket (8) at one end close to the vertical steel bar (5) are both provided with anti-slip grooves (29).

4. The rotary bored pile construction structure according to claim 1 is characterized in that: The lower end of the positioning ring (4) is provided with a plurality of radially distributed positioning blocks (12), and the upper end of the steel casing (3) is provided with a plurality of positioning slots (13) respectively corresponding to and engaging with the plurality of positioning blocks (12).

5. The rotary bored pile construction structure according to any one of claims 1 to 4, characterized in that: A plurality of fixed cross bars (9) are fixedly connected to the inner wall of the positioning ring (4), a casting ring (10) is fixedly connected to the middle of the plurality of fixed cross bars (9), and a steel cage positioning groove (11) penetrating from top to bottom is provided on the plurality of fixed cross bars (9), and a plurality of vertical steel bars (5) are respectively inserted into the plurality of steel cage positioning grooves (11) in a one-to-one correspondence.

6. The rotary bored pile construction structure according to claim 5 is characterized in that: At least one relative fixed cross bar (9) on the positioning ring (4) is provided with a hook assembly for lifting a certain layer of transverse reinforcement (6) on the upper part of the pile body (2), and the hook assembly is composed of a fixed seat (14), a height adjustment clamping rod (15), and a fixed hook plate (16), wherein the fixed seat (14) is sleeved on the fixed cross bar (9), and the fixed seat (14) is provided with two height adjustment clamping rods (15) symmetrical on both sides of the fixed cross bar (9), and the two height adjustment clamping rods (15) are connected to the fixed hook plate (16) for lifting the transverse reinforcement (6) at their divergent ends away from the fixed seat (14).

7. The rotary bored pile construction structure according to claim 6 is characterized in that: The fixing seat (14) is slidably connected to the fixing cross bar (9); a fixing knob (17) is connected to the fixing seat (14) via an internal thread; a locking stop (18) is fixedly connected to the lower end of the fixing knob (17); and the lower end of the locking stop (18) is used to fit tightly against the upper end of the fixing cross bar (9); an unlocking sliding hole (19) is provided on the fixing seat (14), and the locking stop (18) is slidably connected inside the unlocking sliding hole (19).

8. The rotary bored pile construction structure according to claim 6 is characterized in that: A locking bolt (20) and a locking nut (21) for adjusting the displacement of the height adjustment clamping rod (15) relative to the fixing seat (14) are provided on at least one outer side wall of the fixing seat (14); the locking nut (21) is arranged close to the outer side wall of the fixing seat (14).

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