Prestressed or non-prestressed concrete semi-solid square pile and manufacturing method thereof

Abstract

The present invention discloses a prestressed or non-prestressed concrete semi-solid square pile, comprising a pile body, wherein two ends of the pile body are respectively provided with solid areas, a cavity area is provided in the middle of the pile body, the pile body comprises a steel cage and concrete cast inside and outside the steel cage, the steel cage comprises prestressed or non-prestressed steel bars and spiral stirrups connected to the steel bars, the steel bars extend in the longitudinal direction, a cavity part is provided on the inner side of the cavity area, and the cavity part is a pipe sealed at both ends or a moisture-proof high-strength anti-deformation paper tube or a high-pressure concrete stubble-blocking airbag. The present invention has a simple structure, low production cost, stable quality, can be formed in one go, no new and old concrete are connected, the overall pile body strength tends to be consistent, the cavity size can be accurately and controllable, high economy, high corrosion resistance, wide geological adaptability, and meets the use requirements under different conditions. The production process takes into account the production hardware of general solid square piles, and has strong social and promotion value.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete square piles, in particular to a prestressed or non-prestressed concrete semi-solid square pile and a manufacturing method thereof. Background Art

[0002] Common square piles on the market include hollow square piles and solid square piles. The common method for making existing hollow square piles is to tilt the hollow square pile after the hollow square pile is made, seal the bottom, pour concrete under the pile body, and wait for it to solidify to achieve a pile type in which one end of the hollow square pile is blocked. However, the hollow square piles made by this method have the following shortcomings: 1. The new and old concrete are connected, the overall pile body strength is inconsistent, groundwater will enter the inner cavity, and the anti-corrosion ability is insufficient. 2. The pile head concrete is poured for the second time, and the overall strength is inconsistent. The breakage rate of the pile head is high during construction, and it is not easy to ensure the quality of the pile. 3. The cavity inside the hollow square pile is not uniform enough, and the cavity size is not easy to accurately control. 4. The concrete forming process used is a centrifugal process, and the production efficiency is low. Meanwhile, the invention patent with authorization (announcement) number CN 102966101 B discloses a prestressed concrete solid square pile and its manufacturing method. This method primarily utilizes a prestressed steel bar main bar combined with threaded steel main bar to create a steel cage, which is used to enhance the overall structural strength of the square pile. However, this method is costly and uneconomical, making it difficult to mass-produce. Therefore, to overcome the shortcomings of the existing technology, improvements are necessary. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and to provide a prestressed or non-prestressed concrete semi-solid square pile with stable quality and low production cost and a production method thereof.

[0004] Another object of the present invention is to provide a method for manufacturing prestressed or non-prestressed concrete semi-solid square piles.

[0005] The present invention is achieved through the following technical solutions:

[0006] A prestressed or non-prestressed concrete semi-solid square pile includes a pile body, wherein solid areas are respectively provided at both ends of the pile body, and a cavity area is provided in the middle of the pile body. The pile body includes a steel cage and concrete cast inside and outside the steel cage. The steel cage includes prestressed or non-prestressed steel bars and spiral stirrups connected to the steel bars, the steel bars extend in the longitudinal direction, and a cavity member is provided on the inner side of the cavity area, and the cavity member is arranged on the inner side of the steel cage.

[0007] Furthermore, the cross section of the cavity is square or circular.

[0008] Furthermore, the steel bars are connected with steel hooks, the steel hooks are connected with hoop straps, the hoop straps are connected to the cavity parts, the steel hooks are in groups of two, the steel hooks at both ends of the cavity area are in groups of four, the cross-sectional angles of the hoop straps connected by two adjacent groups of the steel hooks are close to 90 degrees, and the distance between the hoop straps connected by each group of the steel hooks does not exceed 2 meters.

[0009] Furthermore, pile hoops are provided at both ends of the pile body, sleeves are provided at both ends of the steel bars, steel meshes are provided at both ends of the pile body, and hooks are provided at the connection between the solid area and the cavity area of ​​the pile body.

[0010] Furthermore, the cavity area of ​​the pile body is provided with a drain outlet.

[0011] Furthermore, the cavity member is a pipe with sealed ends, a moisture-proof high-strength anti-deformation paper tube, or a high-pressure concrete stubble-blocking airbag.

[0012] Furthermore, the steel bars are arranged in a square shape.

[0013] A method for manufacturing prestressed or non-prestressed concrete semi-solid square piles, comprising the following steps:

[0014] Step 1: Material preparation: Prepare prestressed or non-prestressed steel bars, spiral stirrups, cavity parts, pile hoops, steel mesh, and sleeves according to the size of the square piles to be processed;

[0015] Step 2: Use a rolling welding machine to prepare the steel cage by rolling welding; place the cavity piece in the middle of the prepared steel cage, and use an appropriate number of steel hooks to connect high-deformation-resistant hoops according to the weight of the cavity piece to fix the cavity piece in the center of the steel cage;

[0016] Step 3: Prepare the mold and apply an isolation agent on it. If you are making prestressed square piles, install the steel cage made in step 2 on the mold and install a tensioning device. Pre-tension the steel bars according to the tensile grade requirements of solid square pile products, and lock and anchor them after meeting the requirements:

[0017] Step 4: Prepare high performance concrete, pour it into the mold, and vibrate the concrete;

[0018] Step 5: Use natural curing or steam curing: When the concrete strength reaches 70% of the standard strength, if prestressed square piles are manufactured, release the prestressed main reinforcement anchorage and demould to obtain the finished semi-solid square piles.

[0019] Furthermore, in step 2, the cavity member is a pipe with sealed ends, a moisture-proof, high-strength, anti-deformation paper tube, or a high-pressure concrete stubble-blocking airbag.

[0020] Furthermore, in step 2, the steel hooks should be hooked on the steel bars of the steel cage in groups of two, and the steel hooks at both ends of the cavity area are in groups of four. The cross-sectional angle of the hoops connected by two adjacent groups of steel hooks is close to 90 degrees, and the distance between the hoops connected by each group of steel hooks does not exceed 2 meters.

[0021] Compared with the prior art, the present invention provides a square pile with a simple structure, low production cost and stable quality by providing a solid area at each end of the pile body, a cavity area in the middle of the pile body, a cavity member inside the cavity area, and the cavity member inside the steel cage. It has the following beneficial effects:

[0022] 1. It can be formed in one go, without any connection between new and old concrete. The overall pile strength tends to be consistent, and the cavity size can be accurately controlled. It combines the advantages of solid square piles and non-solid square piles, with high economy, high corrosion resistance, and wide geological adaptability.

[0023] 2. The cavity specifications of semi-solid square piles can be selected to meet the requirements of use under different conditions.

[0024] 3. The production process takes into account the production hardware of general solid square piles and has strong social and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic structural diagram of a prestressed or non-prestressed concrete semi-solid square pile according to the present invention;

[0027] Figure 2 for Figure 1 AA cross-sectional structural diagram when the cross section of the cavity is circular;

[0028] Figure 3 for Figure 1 AA cross-sectional structural diagram when the cross section of the cavity is a square;

[0029] Figure 4 for Figure 1 BB cross-sectional structure diagram;

[0030] Figure 5 It is a schematic diagram of the longitudinal cross-sectional structure of the prestressed or non-prestressed concrete semi-solid square pile of the present invention.

[0031] In the figure: 1-pile body; 2-solid area; 3-cavity area; 4-rebar; 5-spiral stirrups; 6-cavity member; 7-pile hoop; 8-sleeve; 9-rebar mesh; 10-upper hoop; 11-lower hoop; 12-hook; 13-drainage outlet. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] like Figures 1 to 5 The present invention shows a prestressed or non-prestressed concrete semi-solid square pile, comprising a pile body 1, with solid areas 2 provided at each end of the pile body 1, a cavity area 3 provided in the middle of the pile body 1, a steel cage and concrete cast inside and outside the steel cage, the steel cage comprising prestressed or non-prestressed steel bars 4 and spiral stirrups 5 connected to the steel bars 4, the steel bars 4 extending in the longitudinal direction, a cavity member 6 provided inside the cavity area 3, and the cavity member 6 provided inside the steel cage. By providing solid areas 2 at each end of the pile body 1, a cavity area 3 provided in the middle of the pile body 1, a cavity member 6 provided inside the cavity area 3, and the cavity member 6 provided inside the steel cage, the square pile has a simple structure, low production cost, and stable quality, and has the following beneficial effects:

[0034] 1. It can be formed in one go, without any connection between new and old concrete. The overall pile strength tends to be consistent, and the cavity size can be accurately controlled. It combines the advantages of solid square piles and non-solid square piles, with high economy, high corrosion resistance, and wide geological adaptability.

[0035] 2. The cavity specifications of semi-solid square piles can be selected to meet the requirements of use under different conditions.

[0036] 3. The production process takes into account the production hardware of general solid square piles and has strong social and promotion value.

[0037] In a specific implementation, the cross section of the cavity 6 is square or circular, which facilitates the pouring of concrete and makes the structure of the square pile more stable.

[0038] The steel bars 4 are connected with steel hooks, which are connected with hoop straps, which are connected to the cavity parts. The steel hooks are in groups of two, and the steel hooks at both ends of the cavity area 3 are in groups of four. The cross-sectional angle of the hoop straps connected by two adjacent groups of steel hooks is close to 90 degrees, forming an upper hoop strap 10 and a lower hoop strap 11. The distance between the hoop straps connected by each group of steel hooks does not exceed 2 meters, so that the hoop straps are firmly connected and costs are saved.

[0039] Pile sleeves 7 are provided at both ends of the pile body 1 to prevent the pile head from being lateral deformed when hit by a hammer. Sleeves 8 are provided at both ends of the steel bar 4. When the steel bar 4 is a prestressed steel bar, the sleeves 8 are connected to facilitate the connection of the tensioning device. The steel bar is pre-tensioned according to the tensile grade requirements of the square pile product.

[0040] Steel meshes 9 are provided at both ends of the pile body 1 to improve the structural strength of the two ends of the square pile.

[0041] A hook 12 is provided at the connection between the solid area 2 and the cavity area 3 of the pile body 1 to facilitate pile hanging.

[0042] The cavity area 3 of the pile body 1 is provided with a drain port 13. Steam curing is used during the manufacturing process, and some moisture will accumulate in the cavity. When the pile is removed from the mold, the water can be discharged through the drain port 13. The drain port 13 is suitable for the pile during construction using a hammering machine. Hammering will cause certain deformation of the pile body, which will increase the air pressure in the cavity. The drain port 13 can ensure the stability of the air pressure in the cavity. The drain port 13 is sealed during construction. When the drain port 13 is close to the ground, it can be filled with high-efficiency and fast-setting filling material one by one to seal it.

[0043] In a specific implementation, the cavity member 6 is a pipe with sealed ends, a moisture-proof, high-strength, anti-deformation paper tube, or a high-pressure concrete stubble-blocking airbag.

[0044] The steel bars 4 are arranged in a square shape to improve the structural stability and force balance of the square pile support.

[0045] A method for manufacturing prestressed or non-prestressed concrete semi-solid square piles, comprising the following steps:

[0046] Step 1: Material preparation: Prepare prestressed or non-prestressed steel bars, spiral stirrups, cavity parts, pile hoops, steel mesh, and sleeves according to the size of the square piles to be processed;

[0047] Step 2: Use a rolling welding machine to prepare the steel cage by rolling welding; place the cavity piece in the middle of the prepared steel cage, and use an appropriate number of steel hooks to connect high-deformation-resistant hoops according to the weight of the cavity piece to fix the cavity piece in the center of the steel cage;

[0048] Step 3: Prepare the mold and apply an isolation agent on it. If you are making prestressed square piles, install the steel cage made in step 2 on the mold and install a tensioning device. Pre-tension the steel bars according to the tensile grade requirements of solid square pile products, and lock and anchor them after meeting the requirements:

[0049] Step 4: Prepare high performance concrete, pour it into the mold, and vibrate the concrete;

[0050] Step 5: Use natural curing or steam curing: When the concrete strength reaches 70% of the standard strength, if prestressed square piles are manufactured, release the prestressed main reinforcement anchorage and demould to obtain the finished semi-solid square piles.

[0051] The semi-solid square piles produced by this production method have the following advantages:

[0052] 1. The appearance of the pile is similar to that of a conventional solid square pile, so that groundwater cannot easily enter the inner cavity, effectively ensuring the anti-corrosion ability. 2. Both ends of the pile head are similar to the solid square pile, that is, it is a full-section pile and the pile head concrete is poured at one time, and the strength is considered to be consistent. During construction, the breakage rate of the pile head can be greatly reduced, and the quality of the pile is guaranteed. 3. The formation of the cavity mainly relies on materials that can be placed inside the square pile to ensure the stable existence of the cavity before the poured concrete is formed. The production cost is low and the structure is stable. 4. It is produced using a solid square pile mold, and the concrete forming process is a vibration process rather than a centrifugal process, which has high production efficiency and good production quality.

[0053] In step 2, the cavity member is a pipe with sealed ends, a moisture-proof high-strength anti-deformation paper tube, or a high-pressure concrete stubble-blocking airbag.

[0054] In step 2, the steel hooks should be hooked on the steel bars of the steel cage in groups of two. The steel hooks at both ends of the cavity area are in groups of four. The cross-sectional angle of the hoops connected by two adjacent groups of steel hooks is close to 90 degrees, and the distance between the hoops connected by each group of steel hooks does not exceed 2 meters.

[0055] Semi-solid square piles have a uniform cavity inside. Generally, the cavity length matches the non-reinforced area, but the length can be adjusted based on design considerations. The diameter and shape of the cavity in semi-solid square piles of equal side length vary depending on the model. The cavity shape can be circular or rectangular with equal side length. The concrete thickness inside the reinforcement should not be less than that outside the reinforcement.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prestressed or non-prestressed concrete semi-solid square pile, characterized in that: It includes a pile body, wherein both ends of the pile body are respectively provided with solid areas, and the middle of the pile body is provided with a cavity area. The pile body includes a steel cage and concrete poured inside and outside the steel cage. The steel cage includes prestressed or non-prestressed steel bars and spiral stirrups connected to the steel bars. The steel bars extend in the longitudinal direction. A cavity member is provided on the inner side of the cavity area, and the cavity member is arranged on the inner side of the steel cage.

2. The prestressed or non-prestressed concrete semi-solid square pile according to claim 1, characterized in that: The cross section of the cavity is square or circular.

3. The prestressed or non-prestressed concrete semi-solid square pile according to claim 1, characterized in that: The steel bars are connected with steel hooks, the steel hooks are connected with hoops, the hoops are connected to the cavity parts, the steel hooks are in groups of two, the steel hooks at both ends of the cavity area are in groups of four, the cross-sectional angle of the hoops connected by two adjacent groups of the steel hooks is close to 90 degrees, and the distance between the hoops connected by each group of the steel hooks does not exceed 2 meters.

4. The prestressed or non-prestressed concrete semi-solid square pile according to claim 1, characterized in that: Pile hoops are arranged at both ends of the pile body, sleeves are arranged at both ends of the steel bars, steel meshes are arranged at both ends of the pile body, and hooks are arranged at the connection between the solid area and the cavity area of ​​the pile body.

5. The prestressed or non-prestressed concrete semi-solid square pile according to claim 1, characterized in that: The cavity area of ​​the pile body is provided with a drainage port.

6. The prestressed or non-prestressed concrete semi-solid square pile according to claim 1, characterized in that: The cavity member is a pipe with sealed ends or a moisture-proof high-strength anti-deformation paper tube or a high-pressure concrete stubble-blocking air bag.

7. The prestressed or non-prestressed concrete semi-solid square pile according to claim 1, characterized in that: The steel bars are arranged in a square shape.

8. A method for manufacturing prestressed or non-prestressed concrete semi-solid square piles, characterized in that: The following steps are included: Step 1: Material preparation: prepare prestressed or non-prestressed steel bars, spiral stirrups, cavity parts, pile hoops, steel mesh, and sleeves according to the size of the square piles to be processed; Step 2: Use a rolling welding machine to prepare a steel cage by rolling welding; place the cavity piece in the middle of the prepared steel cage, and use an appropriate number of steel hooks to connect high-deformation-resistant hoops according to the weight of the manufactured cavity piece to fix the cavity piece to the center of the steel cage; Step 3: Prepare the mold and apply an isolating agent on it. If you are making prestressed square piles, install the steel cage made in step 2 on the mold and install a tensioning device. Pre-tension the steel bars according to the tensile grade requirements of solid square pile products, and lock and anchor them after meeting the requirements: Step 4: prepare high performance concrete, pour it into the mold, and vibrate the concrete; Step 5: Use natural curing or steam curing: When the concrete strength reaches 70% of the standard strength, if prestressed square piles are manufactured, release the prestressed main reinforcement anchorage and demould to obtain the finished semi-solid square piles.

9. The method for manufacturing prestressed or non-prestressed concrete semi-solid square piles according to claim 8, characterized in that: In the step 2, the cavity member is a pipe with sealed ends or a moisture-proof high-strength anti-deformation paper tube or a high-pressure concrete stubble-blocking airbag.

10. The method for manufacturing prestressed or non-prestressed concrete semi-solid square piles according to claim 8, characterized in that: In the step 2, the steel hooks should be hooked on the steel bars of the steel cage in groups of two, and the steel hooks at both ends of the cavity area are in groups of four. The cross-sectional angle of the hoops connected by two adjacent groups of steel hooks is close to 90 degrees, and the distance between the hoops connected by each group of steel hooks does not exceed 2 meters.

Images