Construction technology of long spiral drilling pressure grouting pile

Abstract

The invention relates to the technical field of drilling and press-grouting piles, and particularly discloses a long spiral drilling and press-grouting pile construction process which comprises six process steps of measuring a setting-out positioning pile, placing a drilling machine in place, drilling to a designed depth to form a hole, lifting a bit and press-grouting concrete, manufacturing a reinforcement cage and downwards inserting the reinforcement cage. Wherein in the process step of manufacturing the reinforcement cage, according to the number of main reinforcements of the reinforcement cage, buckle devices capable of being inserted into all the main reinforcements are arranged, and the top of a pile head of the reinforcement cage is inserted into buckles so that the buckles can be connected with the main reinforcements of the reinforcement cage. The buckle device is inserted into the pile head of the reinforcement cage, the buckle plays a role in fixing and protecting the main reinforcement, the effect of replacing a part of stirrups is achieved, it is guaranteed that under the condition that the stirrups fail, the main reinforcement is not exploded or displaced, and the buckle fixing construction process is simple, easy to operate and high in efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of bored cast-in-place piles, and in particular to a construction process for long spiral bored cast-in-place piles. Background Art

[0002] Long spiral bored pile is a new pile construction technology developed in recent years. It has been widely used in recent years because of its low construction noise, no mud pollution, fast pile construction speed, and not easy to collapse. This technology uses a long spiral drill to complete the drilling first, and then uses a concrete delivery pump to pump concrete into the hole through the channel in the center of the drill rod at a certain pressure while the drill rod is lifted. When the drill rod is completely raised, the hole is also filled with concrete. At this time, the steel cage that has been made as a whole is transported to the construction site, and the vibration rod is inserted into the steel cage. Then, the steel cage and the vibration rod are lifted at the same time, and first use their own gravity to put them into the concrete. When they can no longer be put in under the action of gravity, the vibration rod is turned on to vibrate the steel cage to the designed elevation, thereby completing the construction of the grouted pile.

[0003] When the steel cage is lowered and inserted into the concrete, there will be collision between the steel cage and the aggregate in the concrete or the soil in the hole wall. When the collision is greater than a certain range, the stirrups of the steel cage may be separated from the main reinforcement, causing the main reinforcement to deviate from the specified position and affect the subsequent pile quality. Summary of the invention

[0004] The purpose of the present invention is to provide a long spiral bored pile construction process to solve the problem that the steel cage hoops are easily separated from the main reinforcement during the process of lowering the steel cage into concrete, thereby affecting the quality of the pile.

[0005] In order to solve the above problems, the technical solutions provided are as follows:

[0006] A long spiral bored pile construction process comprises the following steps:

[0007] S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network;

[0008] S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically;

[0009] S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth;

[0010] S4: Drilling and concrete pouring: Drilling and concrete pouring, slowly lifting the pile, and simultaneously spraying fluidized concrete, lifting the steel casing and leaving part of the steel casing behind;

[0011] S5: Making a steel cage: The main reinforcement and the reinforcing bars of the steel cage are welded in advance and made into the initial shape of the cage, and then placed on a bidirectional drum. Then, one end of the anchoring end is inserted into the clamping position of the motor head. One end of the steel cage is fixed with the reinforcing bar at its anchoring end. The motor is turned on. One person winds the reinforcing bars while another person welds until the pile head is reached. According to the number of main reinforcements of the steel cage, a buckle device capable of inserting all the main reinforcements is provided. The buckle device includes a conical tube and a plurality of guide grooves. The plurality of guide grooves are fixedly connected to the inner wall of the end with a larger diameter of the conical tube. All the main reinforcements of the pile head of the steel cage are inserted into the conical tube along the guide grooves so that the conical tube is connected to the main reinforcements of the steel cage.

[0012] S6: Inserting the steel cage: The steel cage is lifted by a crane and inserted into the concrete. The vibrator at the end of the crane drives the vibrating rod to work.

[0013] The beneficial effect of the above technical solution is that: a clip device is inserted into the pile head of the steel cage, and the clip plays the role of fixing the main reinforcement and protecting it, replacing the effect of a part of the stirrups, ensuring that the main reinforcement does not explode and move when the stirrups fail, and the construction process of the clip fixation is simple, easy to operate and efficient.

[0014] Preferred solution 1: As a further optimization of the basic solution, the drilling speed of the drilling rig in step S3 is controlled at 1-2.5 m / min.

[0015] Preferred solution 2: As a further optimization of preferred solution 1, the slump of the concrete poured in step S4 is 180-220 mm.

[0016] Preferred solution three: As a further optimization of preferred solution two, in step S5, one person winds the rebar and another person welds until the pile tip is reached, the rotation is stopped, and the rebar is cut off. The pile tip is arranged at the end of the steel cage, and the arrangement of the pile tip helps to enhance the bonding force between the steel cage and the surrounding soil layer, thereby increasing the bearing capacity of the pile body, avoiding the steel cage hoop and the main reinforcement from being separated due to excessive local stress, and also improving the quality of subsequent pile formation.

[0017] Preferred solution 4: As a further optimization of preferred solution 3, the following steps are included:

[0018] S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network;

[0019] S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically;

[0020] S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth;

[0021] S4: Drilling and concrete pouring: Drilling and concrete pouring, slowly lifting the pile, and simultaneously spraying fluidized concrete, lifting the steel casing and leaving part of the steel casing behind;

[0022] S5: Make the steel cage: weld the main reinforcement and the reinforcing bars of the steel cage in advance and make it into the initial shape of the cage, place it on the bidirectional drum, then insert one end of the anchorage into the clamping position of the motor head, fix one end of the steel cage with the reinforcing bars at its anchorage end, turn on the motor, one person winds the reinforcing bars, and one person welds until it reaches the pile head, the ends of the pile head are aggregated to form the pile tip, and several L-shaped steel bars are welded at the pile tip;

[0023] S6: Inserting the steel cage: The steel cage is lifted by a crane and inserted into the concrete. The vibrator at the end of the crane drives the vibrating rod to work.

[0024] Since the friction force on the pile tip is much greater than that on the pile body, the welded L-shaped steel bars are used to optimize the pile tip connection and further enhance the strength of the steel cage pile tip.

[0025] Preferred solution 5: As a further optimization of preferred solution 4, the following steps are included:

[0026] S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network;

[0027] S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically;

[0028] S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth;

[0029] S4: Drilling and concrete pouring: Drilling and concrete pouring, slowly lifting the pile, and simultaneously spraying fluidized concrete, lifting the steel casing and leaving part of the steel casing behind;

[0030] S5: Making a steel cage: The main reinforcement and the stiffening reinforcement of the steel cage are welded in advance and made into the initial shape of the cage, and then placed on a bidirectional drum. Then, one end of the anchorage end is inserted into the clamping position of the motor head, and one end of the steel cage is fixed to the stiffening reinforcement at its anchorage end. The motor is turned on, and one person winds the reinforcement while another person welds until the pile head is reached. The pile head is fixed and placed in a fixed mold. The fixed mold has the same shape as the pile tip of the steel cage, and concrete is poured into the fixed mold to form a pile tip concrete protective head;

[0031] S6: Inserting the steel cage: The steel cage is lifted by a crane and inserted into the concrete. The vibrator at the end of the crane drives the vibrating rod to work.

[0032] Concrete can fix the steel bars at the pile tip. When pressed into the steel cage, the wear of the concrete pile head replaces the wear of the steel cage pile head, further enhancing the strength of the steel cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a process flow of an embodiment of the present invention;

[0034] Figure 2 It is the structural schematic diagram of the steel cage;

[0035] Figure 3 This is a structural diagram of the L-shaped steel bar welded to the tip of the steel cage pile;

[0036] Figure 4 Schematic diagram of the structure for forming a concrete protective head for the steel cage pile tip;

[0037] Figure 5 It is a structural schematic diagram of the matching between the steel cage pile tip and the protection buckle;

[0038] Figure 6 The slump, pouring time and pressing time trend diagram of Examples 1-4 are shown in FIG.

[0039] The reference numerals in the drawings of the specification include: steel cage 1, pile tip 2, pile head 3, L-shaped steel bar 4, concrete protection head 5, and buckle 6. DETAILED DESCRIPTION

[0040] The following is further described in detail through specific implementation methods:

[0041] The embodiment is basically as shown in the attached Figure 1-6 As shown:

[0042] The specific implementation process is as follows:

[0043] Example 1

[0044] A long spiral bored pile construction process, such as Figure 1 As shown, the following steps are included:

[0045] S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network;

[0046] S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically;

[0047] S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth. The drilling speed of the drill is controlled at 1m / min.

[0048] S4: Drilling and concrete pouring: Drilling and pouring piles, slowly lifting piles, and spraying fluidized concrete at the same time, lifting the steel casing and leaving part of the steel casing, the slump of the poured concrete is 180-190mm, and the pouring time is 5.25min;

[0049] S5: Make steel cage 1: weld the main reinforcement and reinforcing bars of steel cage 1 in advance and make it into the initial shape of the cage, place it on the bidirectional roller, then insert one end of the anchorage into the clamping position of the motor head, fix one end of the steel cage 1 with the reinforcing bars at its anchorage end, turn on the motor, one person winds the reinforcing bars, and one person welds. Figure 2 As shown, until the pile tip 2 is reached, the rotation is stopped and the reinforcing bar is cut off;

[0050] S6: Inserting the steel cage 1: The steel cage 1 is lifted by a crane and inserted into the concrete. At the same time, the vibrator at the end of the crane drives the vibrating rod to work.

[0051] Example 2

[0052] A long spiral bored pile construction process, such as Figure 1 As shown, the following steps are included:

[0053] S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network;

[0054] S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically;

[0055] S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth. The drilling speed of the drill is controlled at 1.5m / min.

[0056] S4: Drilling and concrete pouring: Drilling and pouring piles, slowly lifting piles, and spraying fluidized concrete at the same time, lifting the steel casing and leaving part of the steel casing, the slump of the poured concrete is 190-200mm, and the pouring time is 4.13min;

[0057] S5: Make steel cage 1: weld the main reinforcement and reinforcing bars of steel cage 1 in advance and make it into the initial shape of the cage, place it on the bidirectional drum, then insert one end of the anchorage into the clamping position of the motor head, fix one end of the steel cage 1 with the reinforcing bars at its anchorage end, turn on the motor, one person winds the reinforcing bars while another person welds until it reaches the pile tip 2, stop rotating, and cut off the reinforcing bars. Figure 3 As shown, a plurality of L-shaped steel bars 4 are welded at the pile tip 2 of the steel cage 1, the number of the L-shaped steel bars 4 being equal to the number of the main bars of the steel cage, one side of the L-shaped steel bars 4 being welded to the main bars, and the other side being welded to the stirrups to ensure that the main bars and stirrups fit closely;

[0058] S6: Inserting the steel cage 1: The steel cage 1 is lifted by a crane and inserted into the concrete. At the same time, the vibrator at the end of the crane drives the vibrating rod to work.

[0059] Example 3

[0060] A long spiral bored pile construction process, such as Figure 1 As shown, the following steps are included:

[0061] S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network;

[0062] S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically;

[0063] S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth. The drilling speed of the drill is controlled at 2m / min.

[0064] S4: Drilling and concrete pouring: Drilling and pouring piles, slowly lifting piles, and spraying fluidized concrete at the same time, lifting the steel casing and leaving part of the steel casing, the slump of the poured concrete is 200-210mm, and the pouring time is 3.42min;

[0065] S5: Make the steel cage 1: weld the main reinforcement and the reinforcing reinforcement of the steel cage 1 in advance and make it into the initial shape of the cage, place it on the bidirectional drum, then put one end of the anchor end into the clamping position of the motor head, fix one end of the steel cage 1 with the reinforcing reinforcement at its anchor end, turn on the motor, one person winds the reinforcement and one person welds until it reaches the pile head 3, stop rotating, cut off the reinforcement, and fix the pile head 3 into a fixed mold. The fixed mold has the same shape as the pile tip 2 of the steel cage 1, as shown in FIG. Figure 4 As shown, concrete is poured into a fixed mold to form a pile tip 2 concrete protection head 5, and the wear of the concrete protection head 5 replaces the wear of the steel cage 1 pile head 3, and the construction process is relatively simple;

[0066] S6: Inserting the steel cage 1: The steel cage 1 is lifted by a crane and inserted into the concrete. At the same time, the vibrator at the end of the crane drives the vibrating rod to work.

[0067] Example 4

[0068] A long spiral bored pile construction process, such as Figure 1 As shown, the following steps are included:

[0069] S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network;

[0070] S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically;

[0071] S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth. The drilling speed of the drill is controlled at 2.5m / min.

[0072] S4: Drilling and concrete pouring: Drilling and pouring piles, slowly lifting piles, and spraying fluidized concrete at the same time, lifting the steel casing and leaving part of the steel casing, the slump of the poured concrete is 210-220mm, and the pouring time is 3.22min;

[0073] S5: Make steel cage 1: weld the main reinforcement and reinforcing bars of steel cage 1 in advance and make it into the initial shape of the cage, place it on the bidirectional drum, then insert one end of the anchor end into the clamping position of the motor head, fix one end of the steel cage 1 with the reinforcing bars at its anchor end, turn on the motor, one person winds the reinforcing bars, and one person welds until it reaches the pile head 3, stop rotating, cut off the reinforcing bars, and set a buckle 6 device that can insert 8 steel bars according to the number of main bars of steel cage 1, such as Figure 5 As shown, the buckle 6 includes a conical tube and 8 guide grooves, and the 8 guide grooves are fixedly connected to the inner wall of the end of the conical tube with a larger diameter. All the main bars of the pile head of the steel cage 1 are inserted into the conical tube along the guide grooves so that the conical tube is connected to the main bars of the steel cage. The buckle 6 plays a role in fixing and protecting the main bars, replacing the effect of a part of the stirrups, ensuring that the main bars will not explode and move when the stirrups fail.

[0074] S6: Inserting the steel cage 1: The steel cage 1 is lifted by a crane and inserted into the concrete. At the same time, the vibrator at the end of the crane drives the vibrating rod to work.

[0075] Example 1-4 controls the slump of concrete to test the pouring time and the time to insert the steel cage. Table 1 below is a statistical table of the slump of concrete, the pouring time and the time to insert the steel cage in Example 1-4. The trend diagram of the slump of concrete, the pouring time and the time to insert the steel cage in Example 1-4 is shown in Table 1. Figure 6 As shown:

[0076] Table 1 Data statistics of concrete slump, pressure pouring time and time of pressing into steel cage in Example 1-4

[0077] Serial number Slump Pressure filling time Pressing time of steel cage Example 1 180-190mm 5:25 2:12 Example 2 190-200mm 4:13 2:00 Example 3 200-210mm 3:42 1:48 Example 4 210-220mm 3:22 1:34

[0078] Combining the data in Table 1 above and Figure 6 From the trend chart, we can see that the pouring time, the time of pressing the steel cage into place are negatively correlated with the slump (the larger the slump, the faster the speed).

[0079] The influence of the drilling rig lifting speed on the quality of concrete hole formation was tested. The test data of the influence of the drilling rig lifting speed on the pile body quality of Examples 1-4 are shown in Table 2 below;

[0080] Table 2 Experimental data of the influence of drilling speed on pile quality

[0081]

[0082] From the data in Table 2 above, it can be seen that the drilling speed is negatively correlated with the pouring time, and the effect on the pressing time of the steel cage is negligible. Therefore, when the drilling speed is controlled at 1.8-2.5m / min, the quality of the pile body is the best. In the actual construction process, controlling the slump at 200-220 and the lifting speed at 2m / min will improve the construction efficiency while ensuring the project quantity.

[0083] The technical test of anti-explosion reinforcement of long spiral bored pile head is as follows:

[0084] The purpose of the experiment is to simulate whether the pile head of the steel cage is intact under three conditions: normal working conditions, more concrete aggregate (low slump), and the steel cage colliding with the soil.

[0085] Experimental process: Under normal working conditions, the verticality requirements of the steel cage are ensured. After being inserted into different depths, it is pulled out to observe whether the pile head is intact. The results are recorded as shown in Table 3 below. In the case of more concrete aggregates, 140-160 slump concrete is used for the test. After pouring and standing for 40 minutes, the steel cage is inserted. Due to the poor fluidity of concrete, external force is required to apply pressure to insert it. According to the different insertion depths, the number of times the pressure is applied is recorded. The results are shown in Table 4 below. In the case of the steel cage colliding with the soil, the steel cage can be inserted into the concrete by controlling the inclination of less than 10°. It can be pulled out after 5, 10, 15, and 20 times of pressure, and the pile head protection is observed. The results are recorded as shown in Table 5 below.

[0086] Experimental results:

[0087] ①Construction under normal working conditions

[0088] Table 3 Construction conditions under normal working conditions

[0089] Solution Type 1m 3m 5m 10m Example 1 whole whole whole whole Example 2 whole whole whole whole Example 3 whole whole whole whole Example 4 whole whole whole whole

[0090] There was no phenomenon of steel cage bursting.

[0091] ②Construction conditions with more concrete aggregates

[0092] Table 4 Construction conditions with more concrete aggregate

[0093] Solution Type 1m 3m 5m 10m Example 1 3 times 11 times 18 times Deformation Example 2 3 times 13 times 23 times 46 times Example 3 3 times 10 times 17 times 37 times Example 4 2 times 7 times 15 times 32 times

[0094] The main reinforcement of the unprotected pile head deforms after exceeding 5m and can no longer be pressed. The number of times the pile tip protection buckle of Example 4 is pressed is reduced compared with other methods, making it easier to meet construction requirements.

[0095] ③Construction conditions under the condition of steel cage colliding with soil

[0096] Table 5 Construction conditions under which the steel cage pile head protects the collision soil

[0097] Solution Type 5 times 10 times 15 times 20 times Example 1 whole Fried tendons Example 2 whole whole whole Fried tendons Example 3 whole whole whole whole Example 4 whole whole whole whole

[0098] Experimental conclusion: According to the experimental results in Tables 3 to 5, it can be seen that the steel cage with a buckle to protect the pile head in Example 4 can significantly improve the quality of the pile during the construction process and better control the number of pressure applications. Compared with Example 1 in which no protective device is set at the pile tip, Example 2 in which the L-shaped steel bar is welded at the pile tip, and Example 3 in which a concrete protective head is set at the pile tip, it is determined that the pile tip protection buckle set in Example 4 has the best protection effect.

[0099] Three different long spiral bored pile reinforcement cage pile tip protection methods were tested for Examples 2-4, and the results were analyzed using different insertion depths and pressure application times, respectively, and it was concluded that the reinforcement cage pile tip protection buckle in Example 4 can better prevent the reinforcement cage from exploding. Through scheme comparison and testing, it was proved that the use of protection buckles can effectively protect the pile tip reinforcement to prevent the reinforcement from exploding, and to a certain extent, the quality of the pile foundation concrete components was guaranteed, thereby increasing the qualified rate of the finished pile body by about 10%, and increasing the proportion of Class I pile foundations.

[0100] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A long spiral bored pile construction process, characterized in that: The following steps are involved: S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network; S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically; S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth; S4: Drilling and concrete pouring: Drilling and concrete pouring, slowly lifting the pile, and simultaneously spraying fluidized concrete, lifting the steel casing and leaving part of the steel casing behind; S5: Making a steel cage: The main reinforcement and the reinforcing bars of the steel cage are welded in advance and made into the initial shape of the cage, and then placed on a bidirectional drum. Then, one end of the anchoring end is inserted into the clamping position of the motor head. One end of the steel cage is fixed with the reinforcing bar at its anchoring end. The motor is turned on. One person winds the reinforcing bars while another person welds until the pile head is reached. According to the number of main reinforcements of the steel cage, a buckle device capable of inserting all the main reinforcements is provided. The buckle device includes a conical tube and a plurality of guide grooves. The plurality of guide grooves are fixedly connected to the inner wall of the end with a larger diameter of the conical tube. All the main reinforcements of the pile head of the steel cage are inserted into the conical tube along the guide grooves so that the conical tube is connected to the main reinforcements of the steel cage. S6: Inserting the steel cage: The steel cage is lifted by a crane and inserted into the concrete. The vibrator at the end of the crane drives the vibrating rod to work.

2. A long spiral bored pile construction process according to claim 1, characterized in that: In step S3, the drilling speed of the drilling rig is controlled at 1-2.5 m / min.

3. A long spiral bored pile construction process according to claim 2, characterized in that: The slump of the concrete poured in step S4 is 180-220 mm.

4. A long spiral bored pile construction process according to claim 3, characterized in that: In step S5, one person winds the reinforcing bars while another person welds until the pile tip is reached, the rotation is stopped, and the reinforcing bars are cut off.

5. A long spiral bored pile construction process, characterized in that: The following steps are involved: S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network; S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically; S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth; S4: Drilling and concrete pouring: Drilling and concrete pouring, slowly lifting the pile, and spraying fluidized concrete at the same time, lifting the steel casing and leaving part of the steel casing; S5: Make the steel cage: weld the main reinforcement and the reinforcing bars of the steel cage in advance and make it into the initial shape of the cage, place it on the bidirectional drum, then insert one end of the anchorage into the clamping position of the motor head, fix one end of the steel cage with the reinforcing bars at its anchorage end, turn on the motor, one person winds the reinforcing bars, and one person welds until it reaches the pile head, the ends of the pile head are aggregated to form the pile tip, and several L-shaped steel bars are welded at the pile tip; S6: Inserting the steel cage: The steel cage is lifted by a crane and inserted into the concrete. The vibrator at the end of the crane drives the vibrating rod to work.

6. A long spiral bored pile construction process, characterized in that: The following steps are involved: S1: Survey and lay out the positioning piles: According to the axis and pile position arrangement, establish a survey control network in the site, and then measure and lay out the pile positions according to the control network; S2: Drilling rig in place: crawler drilling rig is used, and the drilling rig is positioned. The drilling rig is equipped with a computer control system to adjust the mast and the body of the drilling rig horizontally and vertically; S3: Drilling to the designed depth: Use a long spiral drill with a double power head to drill holes in the soil layer to reach the pile depth; S4: Drilling and concrete pouring: Drilling and concrete pouring, slowly lifting the pile, and spraying fluidized concrete at the same time, lifting the steel casing and leaving part of the steel casing; S5: Making a steel cage: The main reinforcement and the stiffening reinforcement of the steel cage are welded in advance and made into the initial shape of the cage, and then placed on a bidirectional drum. Then, one end of the anchorage end is inserted into the clamping position of the motor head, and one end of the steel cage is fixed to the stiffening reinforcement at its anchorage end. The motor is turned on, and one person winds the reinforcement while another person welds until the pile head is reached. The pile head is fixed and placed in a fixed mold. The fixed mold has the same shape as the pile tip of the steel cage, and concrete is poured into the fixed mold to form a pile tip concrete protective head; S6: Inserting the steel cage: The steel cage is lifted by a crane and inserted into the concrete. The vibrator at the end of the crane drives the vibrating rod to work.

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