Construction method of pile foundation

Abstract

The invention relates to a pile foundation construction method which comprises the following steps: drilling equipment is in place, drilling operation is carried out, holes are cleaned, and reinforcement cages are manufactured and installed, specifically, a main reinforcement cage and a plurality of connecting reinforcement cages are bound, the main reinforcement cage is fixed firstly, then the connecting reinforcement cages are connected with the main reinforcement cage through an installation structure, and then the main reinforcement cage and the connecting reinforcement cages are installed; the mounting structure comprises a main reinforcing steel bar ring and an auxiliary reinforcing steel bar ring which are fixed through a locking assembly. The main reinforcement cage and the connecting reinforcement cage are connected through cooperation of the main reinforcement ring and the auxiliary reinforcement ring, the locking plate and the linkage plate are in linkage, the locking plate and the linkage plate can move synchronously and abut against and are locked outside the main reinforcement ring and the auxiliary reinforcement ring correspondingly, the purposes of fixing the main reinforcement cage and the connecting reinforcement cage are achieved, and operation is convenient and fast.

Description

Technical Field

[0001] This application relates to the technical field of building construction, and particularly relates to a construction method for pile foundations. Background Art

[0002] During the construction of pile foundations, the pouring of pile foundation concrete is of utmost importance and is the key to the success of pile foundation construction. Usually, a pile hole is drilled downward from the ground soil layer by mechanical means. After reaching the design depth, a steel reinforcement cage is placed, and then concrete is poured to form a pile body. When the depth of the pile hole is relatively deep, a longer steel reinforcement cage is required to meet the requirements of pile foundation concrete pouring, which increases the construction difficulty.

[0003] Regarding the above related technologies, the applicant believes that setting the steel reinforcement cage in multiple sections for splicing can solve the above problems, and how to achieve stable connection of multiple sections of steel reinforcement cages is still a technical problem to be solved at present. Summary of the Invention

[0004] In order to set the steel reinforcement cage in multiple sections for connection to meet the construction convenience when the depth of the pile hole is relatively deep, and at the same time improve the stability of the connection of multiple sections of steel reinforcement cages, this application provides a construction method for pile foundations.

[0005] A construction method for pile foundations provided by this application adopts the following technical solutions: A construction method for pile foundations includes the following steps: S1. Positioning of drilling equipment: Determine the pile position, move the drilling rig to the predetermined position and align it with the pile center, ensuring that the verticality of the drill pipe meets the requirements, with a deviation not exceeding 1%; S2. Drilling operation: Start the drilling rig to start drilling. During the process, mud or clean water needs to be continuously injected to keep the hole wall stable and prevent collapse; at the same time, the aperture and verticality of the pile hole need to be regularly checked; S3. Hole cleaning: Stop drilling when reaching the design depth, and remove the sediment at the bottom of the pile hole by the slag removal method to ensure that the bottom of the pile hole is clean without debris; S4. Fabrication and installation of steel reinforcement cage: Pre-bind a main steel reinforcement cage, and then slowly lower it into the designated position in the pile hole by using a crane; according to the depth of the pile hole, bind several connecting steel reinforcement cages, lower the connecting steel reinforcement cages to the main steel reinforcement cage by using a crane, and the connecting steel reinforcement cages are connected to the main steel reinforcement cage through an installation structure; lower the remaining connecting steel reinforcement cages in sequence and also achieve sequential connection through the installation structure; S5. Installation of conduit: Install a conduit inside the steel reinforcement cage; the bottom of the conduit is kept 0.3 - 0.5 meters away from the bottom of the pile hole and ensure good sealing; use the pumping or direct pouring method to pour concrete into the conduit until the concrete surface is 0.5 - 1.0 meters higher than the design elevation, and avoid interruption during the pouring process; S6. Withdrawal of the conduit and subsequent treatment: When the concrete is poured to near the ground surface, gradually lift the conduit until it is completely withdrawn to complete the pouring; finally, perform pile top treatment, chisel off the excess part, and level the surface. The installation structure includes a main steel bar ring fixed to the main steel cage and a secondary steel bar ring fixed to the connecting steel cage; the main steel bar ring and the secondary steel bar ring are in contact with each other and fixed by a locking assembly; the locking assembly includes a locking plate movably connected inside the secondary steel bar ring and extending outside the secondary steel bar ring, and a linkage plate movably connected outside the main steel bar ring. The locking plate and the linkage plate are linked and respectively abut and lock outside the end walls of the main steel bar ring and the secondary steel bar ring that are away from each other.

[0006] By adopting the above technical solution, the main steel bar ring and the secondary steel bar ring are provided to cooperate to realize the connection between the main steel cage and the connecting steel cage. The locking plate and the linkage plate are linked, which is convenient for the locking plate and the linkage plate to move synchronously and respectively abut and lock outside the end walls of the main steel bar ring and the secondary steel bar ring, achieving the purpose of fixing the main steel cage and the connecting steel cage, and the operation is convenient.

[0007] Preferably, the locking assembly further includes an abutting plate liftably connected inside the secondary steel bar ring and a pushing block fixed to the main steel bar ring. One end of the locking plate located inside the secondary steel bar ring is fixed with a telescopic plate. The telescopic plate is connected inside the secondary steel bar ring through a compression spring. The abutting plate abuts against the telescopic plate; the linkage plate is connected inside the main steel bar ring through an extension spring; the pushing block abuts against the bottom of the abutting plate. When the pushing block pushes the abutting plate to rise and be misaligned with the telescopic plate, the locking plate abuts and locks outside the end wall of the secondary steel bar ring.

[0008] By adopting the above technical solution, the abutting plate abuts against the telescopic plate to prevent the locking plate from contracting, maintaining the misalignment relationship between the locking plate and the secondary steel bar ring until the locking plate and the linkage plate are fixedly linked. The pushing block pushes the abutting plate to rise. Under the restoring force of the compression spring, the locking plate drives the linkage plate to move synchronously and respectively abut and lock outside the main steel bar ring and the secondary steel bar ring to fix the main steel bar ring and the secondary steel bar ring.

[0009] Preferably, the locking plate and the linkage plate are fixed by a magnetic attraction structure.

[0010] Preferably, the magnetic attraction structure includes a fixed sleeve extending and fixed below the secondary steel bar ring and a magnetic attraction rod fixed to the main steel bar ring. An activity groove for the magnetic attraction rod to insert and lift is provided inside the fixed sleeve, and the magnetic attraction rod is attracted to the fixed sleeve; moving cavities for the fixed sleeve and the magnetic attraction rod to move are cooperatively provided on the main steel bar ring and the secondary steel bar ring.

[0011] By adopting the above technical solution, as the secondary steel bar ring descends, the magnetic attraction rod gradually inserts into the fixed sleeve and finally is attracted and positioned in the magnet, realizing the linkage between the locking plate and the linkage plate, achieving the purpose of locking the main steel bar ring and the secondary steel bar ring.

[0012] Preferably, a magnet that attracts and engages with the magnetic attraction rod is fixed above the inner side wall of the movable slot. When the magnetic attraction rod is positioned within the fixed sleeve, the magnetic attraction rod attracts and engages with the magnet.

[0013] By adopting the above technical solution, the magnet is fixed above the movable slot, avoiding obstruction during the descent of the secondary steel bar ring and the insertion of the magnetic attraction rod into the fixed sleeve. Until the main steel bar ring and the secondary steel bar ring are in contact, the magnetic attraction rod is positioned and attracted and fixed to the magnet.

[0014] Preferably, the installation structure further includes an insertion rod fixed to the secondary steel bar ring and a slot opened on the main steel bar ring, and the insertion rod is inserted into the slot.

[0015] By adopting the above technical solution, the contact and preliminary cooperative positioning of the main steel bar ring and the secondary steel bar ring are realized through the cooperation of the insertion rod and the slot, facilitating the corresponding cooperation of the magnetic attraction rod and the fixed sleeve.

[0016] Preferably, the height of the insertion rod is higher than that of the push block.

[0017] By adopting the above technical solution, the insertion rod is higher than the push block, facilitating the accurate cooperation of the main steel bar ring and the secondary steel bar ring through the cooperation of the insertion rod and the slot, thereby facilitating the correspondence between the push block and the contact plate and the cooperation between the fixed sleeve and the magnetic attraction rod.

[0018] In summary, the present application includes at least one of the following beneficial technical effects: The main steel bar ring and the secondary steel bar ring are cooperated to realize the mutual connection of the main steel bar cage and the connecting steel bar cage. The locking plate and the linkage plate are linked, facilitating the synchronous movement of the locking plate and the linkage plate and respectively abutting and locking outside the main steel bar ring and the secondary steel bar ring, achieving the purpose of fixing the main steel bar cage and the connecting steel bar cage, and the operation is convenient; The contact plate abuts against the telescopic plate to prevent the locking plate from contracting, maintaining the misaligned relationship between the locking plate and the secondary steel bar ring until the locking plate and the linkage plate are fixedly linked. The push block pushes the contact plate to rise, and under the restoring force of the compression spring, the locking plate drives the linkage plate to move synchronously and respectively abut and lock outside the end walls of the main steel bar ring and the secondary steel bar ring, fixing the main steel bar ring and the secondary steel bar ring; The magnet is fixed above the movable slot, avoiding obstruction during the descent of the secondary steel bar ring and the insertion of the magnetic attraction rod into the fixed sleeve. As the secondary steel bar ring descends, the magnetic attraction rod gradually inserts into the fixed sleeve and finally attracts and is positioned in the magnet, realizing the linkage of the locking plate and the linkage plate, achieving the purpose of locking the main steel bar ring and the secondary steel bar ring; The insertion rod is higher than the push block, facilitating the accurate cooperation of the main steel bar ring and the secondary steel bar ring through the cooperation of the insertion rod and the slot, realizing the contact and preliminary cooperative positioning of the main steel bar ring and the secondary steel bar ring, and facilitating the correspondence between the push block and the contact plate and the cooperation between the fixed sleeve and the magnetic attraction rod. Description of the Drawings

[0019] Figure 1It is a schematic structural diagram of the connection between the main steel reinforcement cage and the connecting steel reinforcement cage in the embodiment of the present application; Figure 2 It is a partial sectional structural schematic diagram of the cooperation between the main steel reinforcement ring and the auxiliary steel reinforcement ring in the embodiment of the present application; Figure 3 It is Figure 2 The enlarged schematic diagram of part A in

[0020] Explanation of reference numerals: 1, main steel reinforcement cage; 2, connecting steel reinforcement cage; 3, installation structure; 31, main steel reinforcement ring; 32, auxiliary steel reinforcement ring; 33, insertion rod; 34, slot; 4, locking assembly; 41, locking plate; 411, telescopic plate; 42, linkage plate; 421, extension spring; 43, abutting plate; 44, push block; 5, compression spring; 6, magnetic attraction structure; 61, fixed sleeve; 611, movable groove; 62, magnetic attraction rod; 7, magnet. Specific implementation mode

[0021] The present application will be further described in detail below with reference to the accompanying drawings.

[0022] The embodiment of the present application discloses a construction method for a pile foundation, including the following steps: S1. Drilling equipment in place: Determine the pile position, move the drilling rig to the predetermined position and align it with the pile center, ensure that the verticality of the drill pipe meets the requirements, and the deviation does not exceed 1%; S2. Drilling operation: Start the drilling rig to start drilling. During the process, continuously inject mud or clear water to keep the hole wall stable and prevent collapse; at the same time, regularly check the aperture and verticality of the pile hole; S3. Hole cleaning: Stop drilling when reaching the designed depth, and remove the sediment at the bottom of the pile hole by the slag removal method to ensure that the bottom of the pile hole is clean without debris; S4. Fabrication and installation of steel reinforcement cage: Pre-bind a main steel reinforcement cage 1, and then slowly lower it into the pile hole to the designated position by using a crane; Bind several connecting steel reinforcement cages 2 according to the depth of the pile hole, lower the connecting steel reinforcement cage 2 to the main steel reinforcement cage 1 by using a crane, and the connecting steel reinforcement cage 2 is connected to the main steel reinforcement cage 1 through the installation structure 3; Lower the remaining connecting steel reinforcement cages 2 in sequence and also achieve sequential connection through the installation structure 3; S5. Installation of conduit: Install the conduit in the steel reinforcement cage; The bottom of the conduit is kept 0.3 - 0.5 meters away from the bottom of the pile hole, and ensure good sealing; Use the pumping or direct pouring method to pour concrete into the conduit until the concrete surface is 0.5 - 1.0 meters higher than the designed elevation, and avoid interruption during the pouring process; S6. Pull out the conduit and subsequent treatment: When the concrete is poured close to the ground, gradually lift the conduit until it is completely pulled out to complete the pouring; Finally, perform pile top treatment, chisel off the excess part and level the surface.

[0023] Refer to Figure 1, 2 Taking the main steel cage 1 and the connecting steel cage 2 as examples, the installation structure 3 includes a main steel bar ring 31, a secondary steel bar ring 32, insertion rods 33 and slots 34. The main steel bar ring 31 is fixed to the upper part of the main steel cage 1, and the secondary steel bar ring 32 is fixed to the lower part of the connecting steel cage 2; the insertion rods 33 are fixed to the inner side of the upper part of the secondary steel bar ring 32 and are arranged circumferentially, and a plurality of slots 34 are opened on the main steel bar ring 31 and correspond to the insertion rods 33. The insertion rods 33 can be inserted into the slots 34 at corresponding positions to realize the abutment and preliminary fitting and positioning of the main steel bar ring 31 and the secondary steel bar ring 32.

[0024] Refer to Figure 1 , 2 After the main steel bar ring 31 and the secondary steel bar ring 32 are in abutting fit, they are fixed by a locking assembly 4; the locking assembly 4 includes a locking plate 41. One end of the locking plate 41 is movably connected to the inside of the secondary steel bar ring 32, the other end is bent outward and extends to the outside of the secondary steel bar ring 32, and the locking plates 41 are arranged oppositely on both sides of the secondary steel bar ring 32.

[0025] Refer to Figure 1 , 2 The locking assembly 4 further includes a linkage plate 42. One end of the linkage plate 42 is connected to the inside of the main steel bar ring 31 through a stretching spring 421, the other end is bent outward and extends to the outside of the main steel bar ring 31, and the linkage plates 42 are arranged oppositely on both sides of the main steel bar ring 31. The stretching spring 421 makes the linkage plate 42 located outside the main steel bar ring 31 and in a state of not abutting against the end wall of the main steel bar ring 31.

[0026] Refer to Figure 1 , 2 The locking plates 41 and the linkage plates 42 on the same side can be linked and respectively abut and lock outside the main steel bar ring 31 and the secondary steel bar ring 32; it should be noted that during the lowering process of the main steel bar ring 31, while the linkage plate 42 protruding outside the main steel bar ring 31 descends, a guiding groove is formed on the side wall of the soil layer in the pile hole, which facilitates the lowering of the locking plate 41 on the secondary steel bar ring 32 along the guiding groove and assists in the accurate positioning of the insertion rods 33 and the slots 34.

[0027] Refer to Figure 2 One end of the locking plate 41 located inside the secondary steel bar ring 32 extends downward and is fixed with a telescopic plate 411. The telescopic plate 411 is connected to the inside of the secondary steel bar ring 32 through a compression spring 5, so that the telescopic plate 411 has a tendency to move into the secondary steel bar ring 32.

[0028] Refer to Figure 2, the locking component 4 further includes a contact plate 43 that is vertically connected inside the secondary steel bar ring 32 and a push block 44 that is fixed on the primary steel bar ring 31. The contact plate 43 abuts against the telescopic plate 411, so that the locking plate 41 is located outside the secondary steel bar ring 32 and is in a state of not abutting against the end wall of the secondary steel bar ring 32; the push block 44 can pass through the primary steel bar ring 31 and abut against the bottom of the contact plate 43; when the push block 44 pushes the contact plate 43 to rise and is misaligned with the telescopic plate 411, under the action of the compression spring 5, the telescopic plate 411 moves towards the inside of the secondary steel bar ring 32, driving the locking plate 41 to move horizontally until it abuts and locks against the outside of the end wall of the secondary steel bar ring 32.

[0029] Refer to Figure 2 , 3 , the height of the insertion rod 33 is higher than that of the push block 44; first, the accurate cooperation between the primary steel bar ring 31 and the secondary steel bar ring 32 is achieved through the cooperation of the insertion rod 33 and the insertion slot 34, so that the correspondence between the push block 44 and the contact plate 43 and the cooperation between the fixed sleeve 61 and the magnetic attraction rod 62 are more easily realized.

[0030] Refer to Figure 2 , 3 , the locking plate 41 and the linkage plate 42 are fixed by the magnetic attraction structure 6; the magnetic attraction structure 6 includes a fixed sleeve 61 that extends and is fixed below the secondary steel bar ring 32 and a magnetic attraction rod 62 that is fixed on the primary steel bar ring 31. The fixed sleeve 61 is located on the side of the telescopic plate 411 outside the secondary steel bar ring 32. An activity slot 611 for the magnetic attraction rod 62 to insert and move up and down is opened inside the fixed sleeve 61. A magnet 7 that attracts the magnetic attraction rod 62 is fixed above the inner side wall of the activity slot 611. When the magnetic attraction rod 62 is positioned inside the fixed sleeve 61, the magnetic attraction rod 62 is attracted and combined with the magnet 7, thus avoiding hindering the process of the secondary steel bar ring 32 descending and the magnetic attraction rod 62 inserting into the fixed sleeve 61 until the primary steel bar ring 31 and the secondary steel bar ring 32 abut, and the magnetic attraction rod 62 is positioned and attracted and fixed with the magnet 7.

[0031] Refer to Figure 2 , 3 , moving cavities for the horizontal movement of the fixed sleeve 61 and the magnetic attraction rod 62 are cooperatively opened on the primary steel bar ring 31 and the secondary steel bar ring 32; as the secondary steel bar ring 32 descends, the magnetic attraction rod 62 gradually inserts into the fixed sleeve 61 and finally is attracted and positioned with the magnet 7, realizing the linkage between the locking plate 41 and the linkage plate 42; when the fixed sleeve 61 and the magnetic attraction rod 62 are fixed, the push block 44 pushes the contact plate 43 to rise, and the restoring force of the compression spring 5 drives the locking plate 41 and the linkage plate 42 to move horizontally synchronously. The locking plate 41 abuts against the corresponding end wall of the secondary steel bar ring 32, and the linkage plate 42 abuts against the corresponding end wall of the primary steel bar ring 31, achieving the purpose of locking the primary steel bar ring 31 and the secondary steel bar ring 32 and completing the splicing of the primary steel bar cage 1 and the connecting steel bar cage 2.

[0032] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A pile foundation construction method, characterized in that: The steps include: S1. Drilling equipment in place: determine the pile position, move the drilling rig to the predetermined position and align it with the pile center, and ensure that the verticality of the drill rod meets the requirements and the deviation does not exceed 1%; S2. Drilling operation: Start the drilling rig and start drilling. During the process, slurry or water should be continuously injected to keep the hole wall stable and prevent collapse. At the same time, the diameter and verticality of the pile hole should be checked regularly. S3. Hole cleaning: Stop drilling after reaching the designed depth, and remove the sediment at the bottom of the pile hole by slag removal to ensure that the bottom of the pile hole is clean and free of debris; S4. Fabrication and installation of steel cages: pre-tie a main steel cage (1), then slowly lower it to a designated position in the pile hole using a crane; tie a number of connecting steel cages (2) according to the depth of the pile hole, lower the connecting steel cage (2) onto the main steel cage (1) using a crane, and connect the connecting steel cage (2) to the main steel cage (1) via a mounting structure (3); lower the remaining connecting steel cages (2) in sequence and also connect them in sequence via the mounting structure (3); S5. Installation of conduit: Install the conduit in the steel cage; keep the bottom of the conduit 0.3-0.5 meters away from the bottom of the pile hole and ensure good sealing; pour concrete into the conduit by pumping or direct pouring until the concrete surface is 0.5-1.0 meters higher than the designed elevation, and avoid interruption during the pouring process; S6. Pull out the pipe and subsequent treatment: When the concrete is poured close to the ground, gradually lift the pipe until it is completely pulled out to complete the pouring; finally, carry out the pile top treatment, chisel off the excess part and level the surface; The mounting structure (3) comprises a main steel bar ring (31) fixed on the main steel bar cage (1) and a secondary steel bar ring (32) fixed on the connecting steel bar cage (2); the main steel bar ring (31) and the secondary steel bar ring (32) are in contact with each other and are fixed by a locking assembly (4); the locking assembly (4) comprises a locking plate (41) movably connected to the secondary steel bar ring (32) and extending to the outside of the secondary steel bar ring (32) and a linkage plate (42) movably connected to the outside of the main steel bar ring (31); the locking plate (41) and the linkage plate (42) are linked and respectively in contact with and locked to the outside of the end walls of the main steel bar ring (31) and the secondary steel bar ring (32) that are away from each other.

2. A pile foundation construction method according to claim 1, characterized in that: The locking assembly (4) further comprises an abutment plate (43) connected to the auxiliary steel bar ring (32) in a lifting manner and a push block (44) fixed on the main steel bar ring (31); a telescopic plate (411) is fixed to one end of the locking plate (41) located in the auxiliary steel bar ring (32); the telescopic plate (411) is connected to the auxiliary steel bar ring (32) via a compression spring (5); the abutment plate (43) abuts against the telescopic plate (411); the linkage plate (42) is connected to the main steel bar ring (31) via an extension spring (421); the push block (44) abuts against the bottom of the abutment plate (43); when the push block (44) pushes the abutment plate (43) to rise to a position offset from the telescopic plate (411), the locking plate (41) abuts against the outside of the end wall of the auxiliary steel bar ring (32) and is locked.

3. A pile foundation construction method according to claim 2, characterized in that: The locking plate (41) and the linkage plate (42) are fixed via a magnetic attraction structure (6).

4. A pile foundation construction method according to claim 3, characterized in that: The magnetic attraction structure (6) comprises a fixing sleeve (61) extending and fixed below the auxiliary steel bar ring (32) and a magnetic attraction rod (62) fixed on the main steel bar ring (31); a movable groove (611) for the magnetic attraction rod (62) to be inserted and lifted is provided in the fixing sleeve (61); and the magnetic attraction rod (62) is attracted to the fixing sleeve (61); and a movable cavity for the fixing sleeve (61) and the magnetic attraction rod (62) to move is provided on the main steel bar ring (31) and the auxiliary steel bar ring (32).

5. A pile foundation construction method according to claim 4, characterized in that: A magnet (7) that engages with the magnetic attraction rod (62) is fixed above the inner side wall of the movable groove (611). When the magnetic attraction rod (62) is positioned in the fixed sleeve (61), the magnetic attraction rod (62) engages with the magnet (7).

6. A pile foundation construction method according to claim 2, characterized in that: The mounting structure (3) further comprises an insertion rod (33) fixed on the auxiliary steel bar ring (32) and a slot (34) provided on the main steel bar ring (31), wherein the insertion rod (33) is inserted into the slot (34).

7. A pile foundation construction method according to claim 6, characterized in that: The insertion rod (33) is higher than the push block (44).

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