Disturbance-free reusable cast-in-place pile head separating device and construction method

Abstract

The invention discloses a disturbance-free reusable cast-in-place pile head separating device and a construction method, and the device comprises an air bag which is provided with an inflation and deflation connector, can block the peripheral area of a whole circle of pile head longitudinal bars after inflation, and is used for isolating the peripheral area of the pile head longitudinal bars from lower concrete before initial setting of the concrete; the sleeve can be sleeved on the pile head longitudinal bars in a plugging manner and is used for isolating the pile head longitudinal bars from concrete in the whole pouring process; the isolator is used for reserving an overflow hole of the guide pipe during pouring and isolating an area within the whole circle of pile head longitudinal bars from lower concrete before initial setting of the concrete and comprises a bottom plate, an opening and closing mechanism and an operating part, the bottom plate is matched with the area within the whole circle of pile head longitudinal bars and provided with the overflow hole, and the operating part can operate the opening and closing mechanism on the ground to open and close the overflow hole. The pile head concrete can be directly lifted away, the work amount is small, construction is easy, and the longitudinal bars cannot be damaged.

Description

Technical Field

[0001] This invention relates to cast-in-place pile construction, specifically to a undisturbed, reusable cast-in-place pile head separation device and construction method. Background Technology

[0002] After the concrete is poured for underground or underwater bored piles, the concrete density at the top of the pile head is poor, there is less coarse aggregate, and the concrete strength at the top is low, which cannot meet the design requirements. Therefore, it is necessary to cut the pile head after the bored pile is cast in place.

[0003] Conventional pile head cutting work usually involves pile chiseling or cutting, which breaks the concrete at the top of the concrete pile to remove the longitudinal reinforcement. This is not only a large-scale and labor-intensive project, but also causes significant damage or even destruction to the longitudinal reinforcement in the pile, which in turn affects the connection of subsequent reinforcement and the reliability of the structure. Summary of the Invention

[0004] The purpose of this invention is to provide a undisturbed and reusable pile head separation device for cast-in-place piles, and a construction method for separating pile heads based on the above device. In this application, the pile head concrete can be directly lifted away, which reduces the amount of work, simplifies construction, and does not damage the longitudinal reinforcement.

[0005] The technical solution adopted in this invention is: A undisturbed, reusable pile head separation device includes an airbag, a sleeve, and an isolator. The airbag has an inflation / deflation port and can seal the outer area of ​​the entire ring of longitudinal reinforcement bars after inflation, thus isolating the outer area of ​​the longitudinal reinforcement bars from the underlying concrete before the concrete initially sets. The sleeve can be fitted onto the longitudinal reinforcement bars of the pile head and is used to isolate each longitudinal reinforcement bar from the concrete throughout the pouring process. The isolator is used to leave an overflow hole for the guide pipe during pouring and to isolate the area within the entire ring of longitudinal reinforcement bars from the underlying concrete before the concrete initially sets. It includes a base plate, an opening / closing mechanism, and an operating component. The base plate matches the area within the entire ring of longitudinal reinforcement bars and has an overflow hole. The operating component allows the opening / closing mechanism to be operated from the ground to open and close the overflow hole.

[0006] Preferably, the opening and closing mechanism includes arc-shaped blades evenly distributed around the center of the base plate on the upper side of the base plate, and a gear ring evenly distributed around the upper side of the arc-shaped blades. The lower end of the arc-shaped blades is provided with a fixed hinge point, and the other upper end is provided with a movable hinge point. The base plate is evenly distributed around the center with point grooves corresponding to the arc-shaped blades. The gear ring is evenly distributed around the center with line grooves corresponding to the arc-shaped blades. The arc-shaped blades are hinged to the corresponding point grooves through the fixed hinge points and engaged with the corresponding line grooves through the movable hinge points. When the gear ring rotates, it can drive all the arc-shaped blades to retract and expand, thereby closing and opening the overflow hole. The operating component is a long rod component with a handle at the upper end and a gear at the lower end that can mesh with the gear ring.

[0007] Preferably, the isolator also includes a brush and a cover plate. The brush is arranged on the inner and outer rings on the upper side of the base plate to form a flexible isolation curtain. The cover plate covers the upper side of the toothed ring. The arc-shaped blade and the toothed ring are accommodated between the base plate, the cover plate and the brush. The cover plate has a through hole in the center and a through hole for the operating element on the edge.

[0008] Preferably, before the concrete initially sets, when the overflow hole is closed by operating the opening and closing mechanism with the operating member, if the operating member gets stuck in the closing direction, it is determined that there are particles stuck in the arc-shaped blade at the overflow hole. The operating member is then moved in the opening direction to unfold the arc-shaped blade, and then moved in the closing direction to retract the arc-shaped blade, squeezing the particles stuck in the arc-shaped blade to float up or fall down, thereby closing the overflow hole.

[0009] Preferably, the outer edge of the base plate is provided with multiple protrusions, which are used to lock between the longitudinal reinforcement bars of the pile head to restrict the rotation of the base plate.

[0010] Preferably, the length of the operating component can be spliced ​​and extended.

[0011] Preferably, the airbag includes two semi-circular small airbags, which together can form a complete circular ring.

[0012] Preferably, the length of the sleeve exceeds the height of the pile head concrete.

[0013] A method for separating the pile head of a cast-in-place pile, based on the aforementioned undisturbed and reusable pile head separation device: Before lowering the reinforcing cage: Place the sleeve on the longitudinal reinforcement of the pile head and position the lower end of the sleeve at the design elevation of the cast-in-place pile. Seal both ends of the sleeve to prevent mud from seeping in. Tie the sleeve to the longitudinal reinforcement of the pile head. Install the airbag on the outside of the reinforcing cage and adjust it to the design elevation of the cast-in-place pile. Connect the inflation / deflation interface to the air pipe. The airbag should be in an uninflated state. Tie the inside of the airbag to the longitudinal reinforcement of the pile head. Place the isolator within the entire ring of longitudinal reinforcement of the pile head and adjust it to the design elevation of the cast-in-place pile. The overflow hole of the bottom plate should be open. Tie the outside of the isolator to the longitudinal reinforcement of the pile head. When lowering the reinforcing cage: ensure that the reinforcing cage is lowered to the design elevation and that the air pipe extends out of the ground; When pouring concrete for the pile body: the guide pipe extends into the pile hole through the overflow hole for underwater pouring. The wall protection mud and the initial concrete float to the top through the overflow hole and the gap between the air bag and the side wall. During this process and in the subsequent process, the sleeve isolates the longitudinal reinforcement of each pile head from the concrete. After the pile body concrete is poured and before the concrete initially sets: the air bladder is inflated by the air tube on the ground. After the air bladder expands, it squeezes the concrete and adheres tightly to the side wall, so that the outer area of ​​the longitudinal reinforcement of the pile head is isolated from the concrete below. The overflow hole is closed by operating the opening and closing mechanism on the ground, so that the area inside the entire ring of longitudinal reinforcement of the pile head is isolated from the concrete below. After the concrete curing and soil cleaning between the piles are completed: Since the pile head concrete is isolated from the pile body concrete and the longitudinal reinforcement of the pile head, the pile head concrete is lifted away directly, and then the airbag is deflated and the airbag and isolator are recovered.

[0014] Preferably, before lowering the reinforcing cage, when installing the isolator, a concrete release agent is applied to the contact area between the isolator and the concrete to prevent adhesion.

[0015] The beneficial effects of this invention are: In this application, the airbag can be inflated and deflated, and the isolator can open and close the overflow hole. Therefore, it will not affect the lowering of the guide pipe or the floating of the wall slurry and initial concrete during pouring. Furthermore, the airbag, sleeve, and isolator can be used to isolate the pile head concrete from the pile body concrete and the pile head longitudinal reinforcement. This eliminates the need to chisel or cut the pile, and the pile head concrete can be directly lifted away. The project is small, the construction is simple, and the longitudinal reinforcement will not be damaged. In addition, the airbag and isolator can be reused, resulting in low material costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a top view of the installation of the undisturbed, reusable cast-in-place pile head separation device of the present invention on the reinforcing cage.

[0018] Figure 2 This is a schematic diagram of the isolator in this invention, excluding the brush for easy observation.

[0019] Figure 3 This is a split cross-sectional view of the isolator in this invention.

[0020] Figure 4 This is a top view of the isolator in this invention.

[0021] Figure 5 This is a schematic diagram of the base plate and brush in this invention.

[0022] Figure 6 This is a schematic diagram of the arc-shaped blade in this invention.

[0023] Figure 7 This is a top view of the installation of the base plate and the arc-shaped blade in this invention.

[0024] Figure 8 This is a top view showing the installation of the arc-shaped blade, gear ring, and operating component in this invention.

[0025] Figure 9 This is a diagram illustrating the process by which the gear ring drives the overflow hole from closing in this invention.

[0026] Figure 10 This is a schematic diagram of the sleeve installation in this invention.

[0027] Figure 11 This is a top view of the airbag in this invention.

[0028] Figure 12 This is a schematic diagram of the steel cage after it has been lowered in this invention.

[0029] Figure 13 This is a schematic diagram illustrating the direct removal of the pile head concrete in this invention.

[0030] In the diagram: 1-protrusion; 2-airbag; 3-sleeve; 4-longitudinal reinforcement of pile head; 5-isolator; 6-overflow hole; 7-through hole; 8-handle; 9-operating component; 10-gear; 11-cover plate; 12-gear ring; 13-groove; 14-arc blade; 15-position groove; 16-base plate; 17-moving hinge point; 18-fixed hinge point; 19-brush; 20-inflation / de-inflation interface; 21-air pipe; 22-pile head concrete. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0035] Example 1 This embodiment discloses a disturbance-free, reusable pile head separation device for cast-in-place piles, such as... Figure 1As shown, it includes an airbag 2, a sleeve 3, and an isolator 5; wherein: as Figure 1 , Figure 11 and Figure 12 As shown, the airbag 2 has an inflation / deflation port 20, which can seal the outer area of ​​the entire ring of longitudinal reinforcement 4 after inflation. It is used to isolate the outer area of ​​the longitudinal reinforcement 4 from the underlying concrete before the concrete initially sets; as shown... Figure 1 , Figure 10 and Figure 12 As shown, sleeve 3 can be fitted onto the longitudinal reinforcement 4 at the pile head, and it is used to isolate each longitudinal reinforcement 4 at the pile head from the concrete throughout the pouring process; as Figure 1 , Figure 2 Zhihe Figure 9 As shown, the isolator 5 is used to leave an overflow hole 6 for the conduit during pouring and to isolate the area within the longitudinal reinforcement 4 of the entire pile head from the lower concrete before the concrete initially sets. It includes a base plate 16, an opening and closing mechanism, and an operating component 9. The base plate 16 matches the area within the longitudinal reinforcement 4 of the entire pile head and has an overflow hole 6. The operating component 9 can operate the opening and closing mechanism on the ground to open and close the overflow hole 6.

[0036] Regarding the opening and closing mechanism of isolator 5, in this embodiment, preferably: as follows: Figure 2 , Figure 3 , Figures 5 to 9 As shown, the opening and closing mechanism includes an arc-shaped blade 14 and a gear ring 12. The arc-shaped blade 14 is laid on the upper side of the base plate 16 and is evenly distributed around the center of the base plate 16. The lower end of the arc-shaped blade 14 is provided with a fixed hinge point 18 and the upper end is provided with a movable hinge point 17. The base plate 16 is evenly distributed around the center with point slots 15 corresponding to the arc-shaped blade 14. The gear ring 12 is laid on the upper side of the arc-shaped blade 14. The gear ring 12 is evenly distributed around the center with line slots 13 corresponding to the arc-shaped blade 14. The arc-shaped blade 14 is hinged to the corresponding point slot 15 through the fixed hinge point 18 and engages with the corresponding line slot 13 through the movable hinge point 17. When the gear ring 12 rotates, it can drive all the arc-shaped blades 14 to retract and expand, thereby closing and opening the overflow hole 6. The operating member 9 is a long rod component with a handle 8 at the upper end and a gear 10 at the lower end that can mesh with the gear ring 12. The opening and closing mechanism is similar to an aperture, which realizes the opening and closing of the overflow hole 6 with a very small space occupation. It adopts gear transmission, which is smooth and reliable.

[0037] Regarding the opening and closing mechanism of isolator 5, in this embodiment, preferably: as follows: Figures 2 to 5 As shown, the isolator 5 also includes a brush 19 and a cover plate 11. The brush 19 is arranged in the inner and outer rings on the upper side of the base plate 16 to form a flexible isolation curtain. The cover plate 11 covers the upper side of the toothed ring 12. The arc-shaped blade 14 and the toothed ring 12 are accommodated between the base plate 16, the cover plate 11, and the brush 19. The cover plate 11 has a through hole in its center and a through hole 7 for the operating element 9 on its edge. The brush 19 and the cover plate 11 can prevent concrete from being poured into the isolator 5 and affecting the arc-shaped blade 14 and the toothed ring 12.

[0038] Regarding the use of the opening and closing mechanism, in this embodiment, preferably: before the concrete initially sets, when the opening and closing mechanism is operated by the operating member 9 to close the overflow hole 6, if the operating member gets stuck in the closing direction, it is determined that there are particles stuck in the arc-shaped blade 14 at the overflow hole 6. The operating member 9 is then operated in the opening direction first to unfold the arc-shaped blade 14, and then operated in the closing direction to retract the arc-shaped blade 14, squeezing the particles stuck in the arc-shaped blade 14 to float up or fall down, thereby closing the overflow hole 6.

[0039] Regarding the base plate 16 of the isolator 5, in this embodiment, preferably: as follows: Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the outer edge of the base plate 16 is provided with multiple protrusions 1, which are used to lock between the longitudinal reinforcement bars 4 of the pile head to restrict the rotation of the base plate 16.

[0040] Regarding the operating component 9 of the isolator 5, in this embodiment, preferably, the length of the operating component 9 can be spliced ​​and extended, and can be extended or shortened according to the design elevation of the pile top at different depths, to meet different needs.

[0041] Regarding airbag 2, in this embodiment, preferably: as follows: Figure 11 As shown, airbag 2 includes two semi-circular small airbags. When the two small airbags are put together, they can form a complete circle, which makes it easy to install on the steel cage and easy to remove.

[0042] Regarding sleeve 3, in this embodiment, preferably, the length of sleeve 3 exceeds the height of the pile head concrete.

[0043] Example 2 This embodiment discloses a construction method for separating the pile head of a cast-in-place pile, based on the undisturbed and reusable pile head separation device in Embodiment 1 above, including the following steps: S1. Before lowering the steel cage Sleeve 3 is placed on the longitudinal reinforcement 4 of the pile head, with the lower end of sleeve 3 at the design elevation of the cast-in-place pile. Both ends of sleeve 3 are sealed to prevent mud from seeping in. Sleeve 3 is then tied to the longitudinal reinforcement 4 of the pile head. Airbag 2 is installed on the outside of the reinforcing cage and adjusted to the design elevation of the cast-in-place pile. The inflation / deflation port 20 is connected to the air pipe 21, and airbag 2 is in an uninflated state. The inside of airbag 2 is tied to the longitudinal reinforcement 4 of the pile head. Isolator 5 is placed within the area of ​​the entire longitudinal reinforcement 4 of the pile head and adjusted to the design elevation of the cast-in-place pile. Overflow hole 6 of bottom plate 16 is in the open state. The outside of isolator 5 is tied to the longitudinal reinforcement 4 of the pile head. Concrete release agent is applied to the contact area between isolator 5 and concrete to prevent adhesion to concrete.

[0044] S2. When lowering the steel cage Ensure that the steel cage is lowered to the design elevation and that the air pipe 21 extends out of the ground.

[0045] S3, When pouring pile body concrete The guide pipe extends into the pile hole through the overflow hole 6 for underwater pouring. The wall protection mud and the initial concrete float to the top through the overflow hole 6 and the gap between the airbag 2 and the side wall. During this process and in the subsequent process, the sleeve 3 isolates the longitudinal reinforcement 4 of each pile head from the concrete.

[0046] S4. After the pile body concrete is poured, but before the concrete initially sets. On the ground, the airbag 2 is inflated using the air tube 21. After the airbag 2 expands, it squeezes the concrete and adheres tightly to the side wall, thus isolating the outer area of ​​the longitudinal reinforcement 4 of the pile head from the concrete below. On the ground, the overflow hole 6 is closed by operating the opening and closing mechanism through the operating piece 9, thus isolating the area within the entire ring of longitudinal reinforcement 4 of the pile head from the concrete below.

[0047] S5. Concrete curing completed, soil between piles cleaned. Since the pile head concrete 22 is isolated from the pile body concrete and the pile head longitudinal reinforcement 4, the pile head concrete 22 is directly lifted away, and then the airbag 2 is deflated and the airbag 2 and the isolator 5 are recovered.

[0048] In this application, the airbag 2 can be inflated and deflated, and the isolator 5 can open and close the overflow hole 6. Therefore, it will not affect the lowering of the guide pipe or the floating of the wall slurry and initial concrete during pouring. Furthermore, the airbag 2, sleeve 3 and isolator 5 can be used to isolate the pile head concrete 22 from the pile body concrete and the pile head longitudinal reinforcement. This eliminates the need to chisel or cut the pile. The pile head concrete 22 can be directly lifted away, resulting in a small workload, simple construction, and no damage to the longitudinal reinforcement. In addition, the airbag 2 and isolator 5 can be reused, resulting in low material costs.

[0049] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A undisturbed, reusable pile head separation device for cast-in-place piles, characterized in that, include: The airbag has an inflation and deflation interface and can seal the outer area of ​​the entire pile head longitudinal reinforcement after inflation, which is used to isolate the outer area of ​​the pile head longitudinal reinforcement from the lower concrete before the concrete initially sets. A sleeve can be fitted onto the longitudinal reinforcement of the pile head to isolate the longitudinal reinforcement of each pile head from the concrete throughout the pouring process; An isolator is used to leave an overflow hole in the conduit during pouring and to isolate the area within the longitudinal reinforcement of the pile head from the underlying concrete before the concrete initially sets. It includes a base plate, an opening and closing mechanism, and an operating component. The base plate matches the area within the longitudinal reinforcement of the pile head and has an overflow hole. The operating component allows the opening and closing mechanism to be operated from the ground to open and close the overflow hole.

2. The undisturbed, reusable cast-in-place pile head separation device as described in claim 1, characterized in that: The opening and closing mechanism includes arc-shaped blades evenly distributed around the center of the base plate on the upper side, and a gear ring on the upper side of the arc-shaped blades. The lower end of the arc-shaped blades is provided with a fixed hinge point, and the upper end is provided with a movable hinge point. The base plate is evenly distributed around the center with point slots corresponding to the arc-shaped blades. The gear ring is evenly distributed around the center with line slots corresponding to the arc-shaped blades. The arc-shaped blades are hinged to the corresponding point slots through the fixed hinge points and engaged with the corresponding line slots through the movable hinge points. When the gear ring rotates, it can drive all the arc-shaped blades to retract and expand, thereby closing and opening the overflow hole. The operating component is a long rod with a handle at the upper end and a gear that can mesh with the gear ring at the lower end.

3. The undisturbed, reusable cast-in-place pile head separation device as described in claim 2, characterized in that: The isolator also includes a brush and a cover plate. The brush is arranged on the inner and outer rings on the upper side of the base plate to form a flexible isolation curtain. The cover plate covers the upper side of the toothed ring. The arc-shaped blades and the toothed ring are accommodated between the base plate, the cover plate and the brush. The cover plate has a through hole in the center and a through hole for the operating element on the edge.

4. The undisturbed, reusable cast-in-place pile head separation device as described in claim 3, characterized in that: Before the concrete sets, when the overflow hole is closed by operating the opening and closing mechanism, if the operating part gets stuck in the closing direction, it is determined that there are particles stuck in the arc-shaped blade at the overflow hole. The operating part is first moved in the opening direction to unfold the arc-shaped blade, and then moved in the closing direction to retract the arc-shaped blade. This forces the particles stuck in the arc-shaped blade to float up or fall down, thereby closing the overflow hole.

5. The undisturbed, reusable cast-in-place pile head separation device as described in claim 2, characterized in that: The outer edge of the base plate has multiple protrusions, which are used to lock between the longitudinal reinforcement bars of the pile head to restrict the rotation of the base plate.

6. The undisturbed, reusable cast-in-place pile head separation device as described in claim 1, characterized in that: The length of the operating parts can be spliced ​​and extended.

7. The undisturbed, reusable cast-in-place pile head separation device as described in claim 1, characterized in that: The airbag consists of two semi-circular small airbags, which together form a complete circular ring.

8. The undisturbed, reusable cast-in-place pile head separation device as described in claim 1, characterized in that: The length of the sleeve exceeds the height of the pile head concrete.

9. A method for separating the pile head of a cast-in-place pile, characterized in that, Based on the disturbance-free, reusable cast-in-place pile head separation device as described in any one of claims 1 to 8: Before lowering the reinforcing cage: Place the sleeve on the longitudinal reinforcement of the pile head and position the lower end of the sleeve at the design elevation of the cast-in-place pile. Seal both ends of the sleeve to prevent mud from seeping in. Tie the sleeve to the longitudinal reinforcement of the pile head. Install the airbag on the outside of the reinforcing cage and adjust it to the design elevation of the cast-in-place pile. Connect the inflation / deflation interface to the air pipe. The airbag should be in an uninflated state. Tie the inside of the airbag to the longitudinal reinforcement of the pile head. Place the isolator within the entire ring of longitudinal reinforcement of the pile head and adjust it to the design elevation of the cast-in-place pile. The overflow hole of the bottom plate should be open. Tie the outside of the isolator to the longitudinal reinforcement of the pile head. When lowering the reinforcing cage: ensure that the reinforcing cage is lowered to the design elevation and that the air pipe extends out of the ground; When pouring concrete for the pile body: the guide pipe extends into the pile hole through the overflow hole for underwater pouring. The wall protection mud and the initial concrete float to the top through the overflow hole and the gap between the air bag and the side wall. During this process and in the subsequent process, the sleeve isolates the longitudinal reinforcement of each pile head from the concrete. After the pile body concrete is poured and before the concrete initially sets: the air bladder is inflated by the air tube on the ground. After the air bladder expands, it squeezes the concrete and adheres tightly to the side wall, so that the outer area of ​​the longitudinal reinforcement of the pile head is isolated from the concrete below. The overflow hole is closed by operating the opening and closing mechanism on the ground, so that the area inside the entire ring of longitudinal reinforcement of the pile head is isolated from the concrete below. After the concrete curing and soil cleaning between the piles are completed: Since the pile head concrete is isolated from the pile body concrete and the longitudinal reinforcement of the pile head, the pile head concrete is lifted away directly, and then the airbag is deflated and the airbag and isolator are recovered.

10. The method for separating the pile head of a cast-in-place pile as described in claim 9, characterized in that: Before lowering the reinforcing cage, when installing the isolator, apply a concrete release agent to the contact area between the isolator and the concrete to prevent it from sticking to the concrete.

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