Pile head breaking-free construction method for cast-in-place concrete pile

Abstract

The invention discloses a cast-in-place concrete pile head breaking-free construction method which comprises the following steps: S1, when a pile foundation construction site earthwork is excavated to a position 30 cm above a designed pile top elevation, surface earthwork is excavated after a pile foundation is positioned, then a special steel casing is buried, in the process of burying the special steel casing, a second supporting frame is controlled to rotate upwards, and the second supporting frame is controlled to rotate upwards; a plurality of second supporting frames are used for supporting, and stable embedding of the specially-made steel casing is completed; s2, a deep channel is dug between a pile hole and a pool opening, a slurry storage pool with a certain size and depth is dug on the pile side, a concrete recycling hopper is placed in the slurry storage pool, and a conveying channel is placed in the deep channel; s3, concrete is poured through a hopper and a guide pipe; s4, when the concrete is poured to the top of the pile, the concrete continues to be poured, and the cement paste and the incompact concrete on the top of the pile are ejected out through the over-poured concrete; and S5, concrete pouring is completed, the conveying channel, the hopper and the guide pipe are dismantled, and concrete on the pile top is cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a construction method for concrete cast-in-place piles without breaking the pile head. Background Art

[0002] Cast-in-place piles are the most commonly used pile foundation construction method in the field of engineering construction. In order to ensure the quality of pile concrete and reduce the risks of under-pouring and broken piles, cast-in-place piles have an over-pouring height of 0.5m to 1.0m according to relevant specifications. In actual construction, the current construction method is to first excavate the site to the designed pile top + over-pouring height, excavate the pile foundation and pour concrete to the over-pouring height, and after the pile foundation reaches a certain strength, excavate the earth to expose the over-pouring part of the pile head, then manually chisel off the pile head, and process the joint at the top of the pile for the next step.

[0003] After searching, the Chinese patent number CN115627753A discloses a pile construction auxiliary device and construction method for pile heads that do not need to be broken, which belongs to the field of building construction technology. The construction auxiliary device includes a special steel casing, a conveying trough, a concrete recovery bucket, and a steel frame; a groove is provided on the top of the special steel casing, and an overflow port is formed by welding a steel plate at the groove. The concrete recovery bucket is welded and fixed on the steel frame, and a conveying trough is overlapped between the overflow port and the concrete recovery bucket. When the present invention is used for construction, the over-filled concrete and the soil, sewage and other debris in the pile can directly flow out to the concrete recovery bucket through the groove on the special steel casing, and the pile head that needs to be broken is not formed. The pile foundation is formed in one time, and the pile head breaking process is omitted while ensuring the quality of the pile foundation casting, which greatly improves the construction efficiency and ensures the quality of the pile foundation.

[0004] When the above scheme is used, under complex geological conditions such as soft soil or quicksand, the burial and stability of the special steel casing may be affected, thereby affecting the construction quality and safety. Therefore, a construction method of concrete bored piles without breaking the pile head is proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that the burial and stability of special steel casings may be affected under complex geological conditions such as soft soil or quicksand, thereby affecting the construction quality and safety, and to propose a construction method for concrete bored piles without breaking the pile head.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The construction method of concrete cast-in-place pile without breaking the pile head includes the following steps:

[0008] S1: When the earthwork of the pile foundation construction site is excavated to 30cm above the designed pile top elevation, the surface earthwork is excavated after the pile foundation is positioned, and then the special steel casing is buried. During the process of burying the special steel casing, the second support frame is controlled to rotate upward, and the threaded rod is rotated to control the top plate to move to a characteristic position on the second support frame. The second support frame is controlled to rotate upward continuously. After the specified angle is reached between the second support frame and the support plate, the sliding block supports the top plate under the action of the first support frame, thereby limiting the second support frame. Multiple groups of second support frames are supported to complete the stable burial of the special steel casing;

[0009] S2: Dig a deep channel between the pile hole and the pool mouth, excavate a slurry storage pool of a certain size and depth on the pile side, put the concrete recovery bucket into the slurry storage pool, place the conveyor road into the deep channel, and use the locking mechanism to lock the conveyor road with the special steel casing and the conveyor road with the concrete recovery bucket. Ensure that the size and depth of the concrete recovery bucket are appropriate so as to accommodate the ejected cement slurry and loose concrete. The deep channel is 20cm deep to ensure that the conveyor road can be placed in it;

[0010] S3: Use the hopper and the conduit to pour concrete. Use the hopper and the conduit to pour concrete, ensure that the pouring process is stable and continuous. When the concrete reaches the top of the pile, continue to pour concrete, and use the over-poured concrete to push out the cement slurry and loose concrete at the top of the pile;

[0011] S4: When the concrete is poured to the top of the pile, the concrete is poured continuously, and the cement slurry and the loose concrete at the top of the pile are displaced by the over-pouring concrete, and the cement slurry and the loose concrete flow into the concrete recovery bucket through the conveying channel, and the pushed-out cement slurry and the loose concrete flow into the concrete recovery bucket through the conveying channel to be separated from the pile body concrete, until qualified concrete appears at the top of the pile, and then the over-pouring is stopped;

[0012] S5: Complete concrete pouring, remove the conveyor, hopper and conduit, clean the concrete on the top of the pile, clean the channel and the concrete on the top of the pile, and ensure that the surface of the pile top is flat and rough so as to better bond with the subsequent construction layer.

[0013] The above further includes:

[0014] Furthermore, the special steel casing includes a cylinder body, and multiple groups of support plates are arranged on the outside of the cylinder body. The support plate is rotatably connected to the first support frame and the second support frame on the outside, and the second support frame is slidably connected to the outside of the sliding block. The sliding block is rotatably connected to the side of the first support frame away from the cylinder body, the support plate is rotatably connected to the second support frame, and the support plate is rotatably connected to the first support frame.

[0015] Furthermore, the second support frame is fixedly connected to a control rod on a side away from the support plate, the control rod is externally threadedly connected to a threaded rod for controlling the position of the top plate, the threaded rod is rotatably connected to a connecting plate on a side close to the support plate, and the connecting plate is fixedly connected to the top plate.

[0016] Furthermore, a lifting lug is fixedly connected above the support plate.

[0017] Further, in S2, the locking mechanism includes a first outer locking groove, a first through groove, a first inner locking groove, a second outer locking groove, a second through groove, a first locking column, a second outer inner groove and a second locking column, and the outside of the cylinder is fixedly connected with an overflow port, and the outside of the overflow port is provided with a first outer locking groove and a first through groove.

[0018] Furthermore, the bottom of the overflow port is equal to the designed pile top elevation.

[0019] Further, the conveying path includes a conveying half pipe, a second through groove is provided on one side of the conveying half pipe, a second outer clamping groove is provided on the side of the conveying half pipe close to the second through groove, a first clamping column is fixedly connected to the side of the conveying half pipe away from the second through groove, a first inner clamping groove is provided on the side of the conveying half pipe away from the second through groove, the second through groove is substantially the same size as the first clamping column, and the size of the second through groove can be slightly larger, the first through groove is substantially the same size as the first clamping column, and the size of the first through groove can be slightly larger, and the first clamping column can separate the concrete to a certain extent, thereby delaying the hardening time of the concrete.

[0020] Furthermore, the concrete recovery bucket includes a recovery bucket body, a connection port is fixedly connected to the outside of the recovery bucket body, a second clamping column is fixedly connected to the outside of the connection port, a second outer inner groove is opened on the outside of the connection port, the second through groove is substantially consistent in size with the second clamping column, the second through groove may be slightly larger in size, and the second clamping column may separate the concrete to a certain extent, thereby delaying the hardening time of the concrete.

[0021] Furthermore, the top elevation of the concrete recovery bucket is lower than the designed pile top elevation.

[0022] Further, in S4, a bracket is fixedly connected to the outside of the recovery bucket body, a discharge port is arranged below the recovery bucket body, and a switch valve is arranged outside the discharge port.

[0023] The present invention has the following beneficial effects:

[0024] 1. In the present invention, the second support frame is placed under complex geological conditions such as soft soil or quicksand, thereby supporting the special steel casing and improving the stability and applicability of the special steel casing. Correspondingly, if a top plate and a threaded rod are also provided on the side of the second support frame close to the support plate, the minimum length of the corresponding side of the second support frame will be limited, thereby fixing the angle of the second support frame and improving the stability of the special steel casing.

[0025] 2. In the present invention, when the special steel casing is connected to the conveying path, the first clamping column is correspondingly engaged with the first through groove. Arranging multiple groups of first clamping columns can separate the concrete to a certain extent. The separated concrete after passing through the first clamping column is aggregated here, and the concrete is mixed in a changing direction, thereby delaying the hardening time of the concrete. When the conveying paths are connected to each other, the first clamping column of one group of conveying paths is correspondingly engaged with the second through groove of another group of conveying paths. When the conveying path is connected to the concrete recovery bucket, the second clamping column is correspondingly engaged with the second through groove. The second clamping column plays the role of delaying the hardening time of the concrete. Through the clamping assembly, the device is easy to disassemble and use.

[0026] 3. In the present invention, the strength of the concrete on the pile top can be ensured while avoiding the pile head from being broken. The concrete in the slurry storage tank can be transported out as needed or transported out after solidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A method step diagram of the concrete cast-in-place pile construction method without pile head breaking proposed by the present invention;

[0028] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the special steel casing in the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the conveying path in the present invention;

[0031] Figure 5 It is a structural schematic diagram of the concrete recovery bucket in the present invention;

[0032] Figure 6 It is a cross-sectional view of the present invention;

[0033] Figure 7 for Figure 3 The enlarged schematic diagram at A in the middle;

[0034] Figure 8 for Figure 6 The enlarged schematic diagram of point B in the middle;

[0035] Fig. 9 for Figure 6 The enlarged schematic diagram at C in the middle;

[0036] Fig.10 for Figure 6 Enlarged schematic diagram at point D in the middle.

[0037] In the figure: 1. special steel casing; 11. cylinder; 12. overflow port; 13. first outer clamping slot; 14. first through slot; 15. support plate; 16. lifting ear; 17. first support frame; 18. second support frame; 19. top plate; 110. sliding block; 111. control rod; 112. threaded rod; 113. connecting plate; 2. conveying path; 21. conveying half pipe; 22. first inner clamping slot; 23. second outer clamping slot; 24. second through slot; 25. first clamping column; 3. concrete recovery bucket; 31. recovery bucket body; 32. bracket; 33. connecting port; 34. second outer inner slot; 35. second clamping column; 36. discharge port. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-Figure 10 As shown, the present invention is a construction method for concrete cast-in-place piles without breaking the pile head, comprising the following steps:

[0040] S1: When the earthwork of the pile foundation construction site is excavated to 30 cm above the designed pile top elevation, the surface earthwork is excavated after the pile foundation is positioned, and then the special steel casing 1 is buried. During the process of burying the special steel casing 1, the second support frame 18 is controlled to rotate upward, and the threaded rod 112 is rotated to control the top plate 19 to move to a characteristic position on the second support frame 18, and the second support frame 18 is controlled to rotate upward continuously. After the second support frame 18 and the support plate 15 reach a specified angle, the sliding block 110 supports the top plate 19 under the action of the first support frame 17, thereby limiting the second support frame 18, and multiple groups of second support frames 18 are supported to complete the stable embedding of the special steel casing 1;

[0041] S2: dig a deep channel between the pile hole and the pool mouth, dig a slurry storage pool of a certain size and depth on the pile side, put the concrete recovery bucket 3 into the slurry storage pool, place the conveyor 2 into the deep channel, and clamp the conveyor 2 with the special steel casing 1 and the conveyor 2 with the concrete recovery bucket 3 through the clamping mechanism. Ensure that the size and depth of the concrete recovery bucket 3 are appropriate so as to accommodate the ejected cement slurry and loose concrete. The deep channel is 20 cm deep to ensure that the conveyor 2 can be placed in it;

[0042] S3: Use the hopper and the conduit to pour concrete. Use the hopper and the conduit to pour concrete, ensure that the pouring process is stable and continuous. When the concrete reaches the top of the pile, continue to pour concrete, and use the over-poured concrete to push out the cement slurry and loose concrete at the top of the pile;

[0043] S4: When the concrete is poured to the pile top, the concrete is continued to be poured, and the cement slurry and the uncompacted concrete at the pile top are displaced by the over-pouring concrete, and the cement slurry and the uncompacted concrete flow into the concrete recovery bucket 3 through the conveying channel 2, and the pushed-out cement slurry and the uncompacted concrete flow into the concrete recovery bucket 3 through the conveying channel 2 to be separated from the pile body concrete, until qualified concrete appears at the pile top, and the over-pouring is stopped;

[0044] S5: Complete concrete pouring, dismantle conveyor 2, hopper and conduit, clean the concrete on the top of the pile, clean the channel and the concrete on the top of the pile, and ensure that the surface of the pile top is flat and rough so as to better bond with the subsequent construction layer.

[0045] In one embodiment, for the above-mentioned S1, in S1, the special steel casing 1 includes a cylinder body 11, and a plurality of support plates 15 are arranged outside the cylinder body 11, and the support plate 15 is rotatably connected to the first support frame 17 and the second support frame 18 outside, and the second support frame 18 is slidably connected to the sliding block 110 outside, and the sliding block 110 is rotatably connected to the side of the first support frame 17 away from the cylinder body 11, the support plate 15 is rotatably connected to the second support frame 18, and the support plate 15 is rotatably connected to the first support frame 17.

[0046] In one embodiment, for the above-mentioned second support frame 18, the side of the second support frame 18 away from the support plate 15 is fixedly connected to the control rod 111, the external thread of the control rod 111 is connected to a threaded rod 112 for controlling the position of the top plate 19, and the side of the threaded rod 112 close to the support plate 15 is rotatably connected to a connecting plate 113, and the connecting plate 113 is fixedly connected to the top plate 19.

[0047] In this embodiment, the support plate 15, the first support frame 17 and the second support frame 18 form a triangle, wherein the length of the support plate 15 and the first support frame 17 remains unchanged, the length of the corresponding side of the second support frame 18 can be changed, and the corresponding angle between the second support frame 18 and the support plate 15 will also change. The distance between the connecting plate 113 and the control rod 111 is changed by rotating the threaded rod 112, that is, the position of the top plate 19 on the second support frame 18 can be controlled by rotating the threaded rod 112, and the first support frame 17 is rotatably connected to the sliding block 110, and the sliding block 110 is slidably connected to the second support frame 18. When the top plate 1 After the position of 9 is determined, the maximum length of the corresponding side of the second support frame 18 is also determined. At this time, the maximum angle between the second support frame 18 and the support plate 15 is also limited. The second support frame 18 is placed under complex geological conditions such as soft soil or quicksand, thereby supporting the special steel casing 1 and improving the stability and applicability of the special steel casing 1. Correspondingly, if a top plate 19 and a threaded rod 112 are also provided on the side of the second support frame 18 close to the support plate 15, the minimum length of the corresponding side of the second support frame 18 will be limited, thereby fixing the angle of the second support frame 18 and improving the stability of the special steel casing 1.

[0048] In one embodiment, for the support plate 15 , a lifting lug 16 is fixedly connected to the top of the support plate 15 .

[0049] In one embodiment, for the above-mentioned S2, in S2, the locking mechanism includes a first outer locking groove 13, a first through groove 14, a first inner locking groove 22, a second outer locking groove 23, a second through groove 24, a first locking column 25, a second outer inner groove 34 and a second locking column 35, and the overflow port 12 is fixedly connected to the outside of the cylinder 11, and the first outer locking groove 13 and the first through groove 14 are opened outside the overflow port 12.

[0050] In one embodiment, for the overflow port 12, the bottom of the overflow port 12 is equal to the designed pile top elevation.

[0051] In one embodiment, for the above-mentioned conveying path 2, the conveying path 2 includes a conveying half pipe 21, a second through groove 24 is provided on one side of the conveying half pipe 21, a second outer clamping groove 23 is provided on the side of the conveying half pipe 21 close to the second through groove 24, a first clamping column 25 is fixedly connected to the side of the conveying half pipe 21 away from the second through groove 24, a first inner clamping groove 22 is provided on the side of the conveying half pipe 21 away from the second through groove 24, the second through groove 24 is substantially the same size as the first clamping column 25, the size of the second through groove 24 can be slightly larger, the first through groove 14 is substantially the same size as the first clamping column 25, the size of the first through groove 14 can be slightly larger, and the first clamping column 25 can separate the concrete to a certain extent, thereby delaying the hardening time of the concrete.

[0052] In one embodiment, for the above-mentioned concrete recovery bucket 3, the concrete recovery bucket 3 includes a recovery bucket body 31, the recovery bucket body 31 is fixedly connected to a connection port 33 on the outside, the connection port 33 is fixedly connected to a second clamping column 35 on the outside, and a second outer inner groove 34 is opened on the outside of the connection port 33. The second through groove 24 and the second clamping column 35 are substantially the same in size, and the second through groove 24 can be slightly larger in size. The second clamping column 35 can separate the concrete to a certain extent, thereby delaying the hardening time of the concrete.

[0053] In this embodiment, when the special steel casing 1 is connected to the conveying road 2, the first outer clamping groove 13 is correspondingly engaged with the first inner clamping groove 22, and the first clamping column 25 is correspondingly engaged with the first through groove 14. The first clamping column 25 is provided with multiple groups, and the first through groove 14 is correspondingly provided with multiple groups, which can improve the stability of the clamping. The multiple groups of first clamping columns 25 can separate the concrete to a certain extent. The separated concrete after passing through the first clamping column 25 is aggregated here, and the concrete is mixed in a reverse direction, thereby delaying the hardening time of the concrete.

[0054] When the conveying paths 2 are connected, the second outer clamping groove 23 of one group of conveying paths 2 is correspondingly engaged with the first inner clamping groove 22 of another group of conveying paths 2, and the first clamping column 25 of one group of conveying paths 2 is correspondingly engaged with the second through groove 24 of another group of conveying paths 2. There are multiple groups of first clamping columns 25, and multiple groups of second through grooves 24 are correspondingly arranged. Similarly, the first clamping columns 25 play a role in delaying the hardening time of concrete.

[0055] When the conveying path 2 is connected to the concrete recovery bucket 3, the second outer clamping groove 23 is correspondingly engaged with the second outer inner groove 34, and the second clamping column 35 is correspondingly engaged with the second through groove 24. The second clamping column 35 is provided with multiple groups, and the second through groove 24 is correspondingly provided with multiple groups. The second clamping column 35 is provided with multiple groups, and the second through groove 24 is correspondingly provided with multiple groups. Similarly, the second clamping column 35 plays a role in delaying the hardening time of concrete.

[0056] In one embodiment, for the concrete recovery bucket 3, the top elevation of the concrete recovery bucket 3 is lower than the designed pile top elevation.

[0057] In one embodiment, for the above S4, in S4, a bracket 32 ​​is fixedly connected to the outside of the recovery bucket 31, a discharge port 36 is provided below the recovery bucket 31, and a switch valve is provided outside the discharge port 36.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing a concrete cast-in-place pile without breaking the pile head, characterized in that: The following steps are involved: S1: When the earthwork at the pile foundation construction site is excavated to a position 30 cm above the designed pile top elevation, the surface earthwork is excavated after the pile foundation is positioned, and then the special steel casing (1) is buried. During the process of burying the special steel casing (1), the second support frame (18) is controlled to rotate upward, and the threaded rod (112) is rotated to control the top plate (19) to move to a specific position on the second support frame (18). The second support frame (18) is controlled to rotate upward continuously. After the second support frame (18) and the support plate (15) reach a specified angle, the sliding block (110) supports the top plate (19) under the action of the first support frame (17), thereby limiting the second support frame (18). Multiple groups of second support frames (18) are supported to complete the stable burial of the special steel casing (1); S2: digging a deep channel between the pile hole and the pool mouth, excavating a slurry storage pool of a certain size and depth on the pile side, placing a concrete recovery bucket (3) into the slurry storage pool, placing the conveying road (2) into the deep channel, and engaging the conveying road (2) with the special steel casing (1) and the conveying road (2) with the concrete recovery bucket (3) through an engaging mechanism; S3: pouring concrete using hopper and conduit; S4: When the concrete is poured to the top of the pile, the concrete is continued to be poured, and the cement slurry and the loose concrete at the top of the pile are pushed out by the over-poured concrete, and the cement slurry and the loose concrete flow into the concrete recovery bucket (3) through the conveying channel (2); S5: After the concrete pouring is completed, the conveyor road (2), the hopper and the guide tube are removed, and the concrete on the top of the pile is cleaned.

2. The method for constructing a concrete bored pile without removing the pile head according to claim 1, characterized in that: In S1, the special steel casing (1) includes a cylinder (11), and a plurality of support plates (15) are arranged outside the cylinder (11), and the support plate (15) is rotatably connected to a first support frame (17) and a second support frame (18) outside, and the second support frame (18) is slidably connected to a sliding block (110) outside, and the sliding block (110) is rotatably connected to a side of the first support frame (17) away from the cylinder (11), and the support plate (15) is rotatably connected to the second support frame (18), and the support plate (15) is rotatably connected to the first support frame (17).

3. The method for constructing a concrete bored pile without removing the pile head according to claim 2, characterized in that: The side of the second support frame (18) away from the support plate (15) is fixedly connected to a control rod (111); the control rod (111) is externally threadedly connected to a threaded rod (112) for controlling the position of the top plate (19); the side of the threaded rod (112) close to the support plate (15) is rotatably connected to a connecting plate (113); the connecting plate (113) is fixedly connected to the top plate (19).

4. The method for constructing a concrete bored pile without removing the pile head according to claim 3, characterized in that: A lifting lug (16) is fixedly connected to the top of the support plate (15).

5. The method for constructing a concrete bored pile without removing the pile head according to claim 4, characterized in that: In S2, the locking mechanism comprises a first outer locking groove (13), a first through groove (14), a first inner locking groove (22), a second outer locking groove (23), a second through groove (24), a first locking column (25), a second outer inner groove (34) and a second locking column (35); the outside of the cylinder (11) is fixedly connected to an overflow port (12); the outside of the overflow port (12) is provided with a first outer locking groove (13) and a first through groove (14).

6. The method for constructing a concrete bored pile without breaking the pile head according to claim 5, characterized in that: The bottom of the overflow port (12) is equal to the designed pile top elevation.

7. The method for constructing a concrete bored pile without breaking the pile head according to claim 1, characterized in that: The conveying path (2) comprises a conveying half pipe (21), a second through slot (24) is provided on one side of the conveying half pipe (21), a second outer clamping slot (23) is provided on the side of the conveying half pipe (21) close to the second through slot (24), a first clamping column (25) is fixedly connected to the side of the conveying half pipe (21) away from the second through slot (24), and a first inner clamping slot (22) is provided on the side of the conveying half pipe (21) away from the second through slot (24).

8. The method for constructing a concrete bored pile without breaking the pile head according to claim 7, characterized in that: The concrete recovery bucket (3) comprises a recovery bucket body (31), the recovery bucket body (31) is externally fixedly connected with a connection port (33), the connection port (33) is externally fixedly connected with a second clamping column (35), and the connection port (33) is externally provided with a second outer inner groove (34).

9. The method for constructing a concrete bored pile without breaking the pile head according to claim 8, characterized in that: The top elevation of the concrete recovery bucket (3) is lower than the designed pile top elevation.

10. The method for constructing a concrete bored pile without breaking the pile head according to claim 8, characterized in that: In S4, a bracket (32) is fixedly connected to the outside of the recovery bucket (31), a discharge port (36) is provided below the recovery bucket (31), and a switch valve is provided outside the discharge port (36).

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