Prefabricated concrete pile column and foundation pit supporting reinforced concrete inner support connecting method
By using the connection between the steel mesh cylinder and the fixed components and auxiliary hammer modules in the precast concrete pile columns, the problems of degradation of welding accuracy and pile driving offset are solved, and efficient and precise installation of foundation pit support construction is achieved.
Patent Information
- Application Number
- CN202411801192.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-01-07
AI Technical Summary
The accuracy of traditional precast concrete piles and columns decreases during welding and is not easy to align, resulting in a shift in the pile load and reduces the pile loading accuracy.
The steel mesh is connected to the fixed assembly, and the alignment is achieved through the positioning assembly and the embedded assembly. When driving piles, the pile driving auxiliary cone head and hammering auxiliary head are used to ensure the force balance and precise positioning of the pile columns.
The installation efficiency and accuracy of precast concrete piles are improved, the overall stability and durability of the pile body are enhanced, and the construction accuracy and safety of the foundation pit support structure are ensured.
Smart Images
Figure CN119266247A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building construction, in particular to a method for connecting a precast concrete pile column with a reinforced concrete inner support of a foundation pit support. Background Art
[0002] Foundation pit support is a systematic project and also a risk project. The design process should fully understand the characteristics of the support project. The design plan should not only ensure the safety of the entire support structure, but also facilitate construction and save costs. At present, the scope of land use is limited, and the support structure cannot exceed the red line of the land use scope, resulting in most foundation pits in soft soil areas adopting the support form of plate retaining wall combined with concrete internal support. The internal support system consists of two basic components: horizontal support and vertical support. In conventional support projects, vertical components include columns and column piles. Among them, columns often use angle steel lattice columns, H-shaped steel, steel pipes or steel tube concrete columns, and column piles often use cast-in-place piles, cement soil mixing piles or high-pressure rotary spray piles; some projects use PHC pipe piles. According to the needs of the project, the columns and column piles are designed in combination. For large-scale deep foundation pit projects, the vertical support system adopts the above combination form, which is costly and uneconomical, and the column piles require a long maintenance time.
[0003] The application of precast piles as column piles in deep foundation pit support engineering is a new attempt. The two ends of traditional precast concrete piles are flat structures, which makes it difficult to align before piling multiple precast concrete piles. The subsequent piling force is offset, resulting in reduced piling accuracy. Therefore, a connection method between precast concrete piles and reinforced concrete inner supports of foundation pit support is needed. Summary of the invention
[0004] In view of the deficiencies in the prior art, the present invention provides a method for connecting precast concrete piles with reinforced concrete inner supports of foundation pit support, which solves the problem that traditional precast concrete piles have reduced accuracy during welding and are difficult to align, causing subsequent piling force to be offset, resulting in reduced piling accuracy.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A precast concrete pile column comprises a steel mesh tube, which is welded from a plurality of steel bars, the outer wall of which is poured with a concrete cylinder, and a through-type pouring cavity is left inside the concrete cylinder for pouring concrete after the piling is completed, the top and bottom sides of the steel mesh tube are connected to a chassis via a fixing assembly, and a sealing plate is provided on the separated side of the chassis on both sides, and the sealing plates on both sides are positioned and engaged by a positioning assembly, so as to align and position two precast concrete pile columns when they are welded, reduce displacement during piling, and balance the force on a plurality of precast concrete pile columns, and the chassis and the sealing plate are embedded and fixed with the concrete cylinder via an embedded assembly.
[0006] Preferably, the fixing assembly includes a plurality of fixing sleeves respectively fixedly connected to the separated sides of the two chassis, both ends of the steel mesh tube are sleeved inside the fixing sleeves, the separated ends of the fixing sleeves on both sides penetrate the separated sides of the sealing plates on both sides and are threadedly connected with screw sleeves, and the screw sleeves are tightly pressed against the sealing plates.
[0007] Preferably, the positioning assembly includes a positioning tooth 1 fixedly connected to the top side of the sealing disk and a positioning groove 1 provided on the bottom side of the sealing disk, and the specifications of the positioning tooth 1 and the positioning groove 1 are matched.
[0008] Preferably, the mosaic component includes a plurality of limiting cavities opened inside the sealing plate and an embedding sleeve fixedly connected to the inner wall of the chassis, a plurality of concrete nails are arranged on the top side of the concrete cylinder, the concrete nails are located inside the limiting cavities, and the bottom end of the embedding sleeve is arranged inside the concrete cylinder.
[0009] Preferably, it further comprises a piling auxiliary cone head for assisting piling, the top side of the piling auxiliary cone head is fixedly connected with a second positioning tooth, and the specification of the second positioning tooth is the same as that of the first positioning tooth.
[0010] Preferably, it further comprises a hammering auxiliary head, wherein a second positioning groove is formed on the bottom side of the hammering auxiliary head, and the specification of the second positioning groove is the same as that of the first positioning groove.
[0011] The method for connecting inner support of reinforced concrete for foundation pit support comprises the following steps: Step 1: First, carry out the construction of the external support structure of the foundation pit and the excavation of the foundation pit, construct the underground continuous wall along the outer side of the foundation pit excavation line, and then excavate a layer of foundation pit soil; Step 2: construct horizontal ring beams and horizontal inner supports to form the support structure inside the foundation pit, excavate to the designed depth, and clean the bottom side of the foundation pit; Step 3: First, put the pile driving auxiliary cone head into the foundation pit, then drive the precast concrete pile into the foundation pit, align the positioning groove 1 on the bottom side of the sealing plate of the precast concrete pile with the positioning tooth 2 on the pile driving auxiliary cone head, and clamp them; Step 4: Use a pile driver to drive the precast concrete piles into the deep end of the foundation pit; Step 5: After one of the precast concrete piles is driven, a preset precast concrete pile is added above the precast concrete pile to merge them, and step 4 is repeated; Step 6: After completing the designed internal support pile filling depth, clean the surrounding area of the foundation pit.
[0012] Preferably, in step 4, before the piling work is carried out, the hammer auxiliary head is preferably placed in alignment with the top side of the precast concrete pile column so that the second positioning groove on the hammer auxiliary head is engaged with the first positioning tooth to protect the structure on the top side of the precast concrete pile column from deformation.
[0013] Preferably, after adding a preset precast concrete pile above the precast concrete pile in step five, the positioning grooves 1 and the positioning teeth 1 of the two precast concrete piles are engaged and positioned, and then the surface of the connection between the two precast concrete piles is cleaned, and the joint is welded and fixed.
[0014] Preferably, after the designed inner support pile filling depth is completed in step 6, either one of the two solutions of pouring concrete into the pouring cavity of the precast concrete pile column or not pouring concrete is selected as a subsequent treatment according to design requirements.
[0015] Working principle: When preparing the precast concrete pile column in advance, first weld the steel mesh tube, then put the chassis on both ends, insert the protruding structures at both ends of the steel mesh tube into the fixing sleeve, then put the sealing plate on the chassis, and insert the fixing sleeve into the sealing plate, so that the fixing sleeve closes and fixes the two ends of the steel mesh tube, and then tightens the threaded structure on the fixing sleeve with a screw sleeve to further close and fix the fixing sleeve, so that the two ends of the steel mesh tube are bitten and fixed. After the two ends are fixed, the concrete is poured. The cast concrete cylinder will wrap the embedded sleeve, and the L-shaped section structure of the embedded sleeve will hook the concrete cylinder, thereby fixing the chassis connected to the embedded sleeve. The concrete will also form a matching concrete nail in the limit cavity with a T-shaped section, thereby fixing the sealing plate with the limited cavity, and then remove the screw sleeve for recycling to complete the preparation of the precast concrete pile column.
[0016] The present invention provides a method for connecting precast concrete piles and reinforced concrete inner supports of foundation pit support, which has the following beneficial effects: 1. The present invention realizes the rapid installation and precise positioning of precast concrete piles, the snap-fit adaptor splicing design, and the external module accessories of the pile driving auxiliary cone head and the hammer auxiliary head, so that multiple precast concrete piles are subjected to more balanced force during pile driving and installation in foundation pit support construction, and the construction efficiency and the installation accuracy of the pile body are improved.
[0017] 2. The present invention provides a simple and effective fixing method, ensuring the firm fixation of both ends of the steel mesh tube. The structural design of the embedded sleeve and the concrete nails enables the base plate and the closing plate to be effectively fixed when the concrete cylinder is poured, thereby enhancing the overall stability and durability of the pile. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A three-dimensional diagram of a precast concrete pile of the present invention; Figure 2 It is a schematic diagram of the position of the steel mesh tube of the precast concrete pile column of the present invention; Figure 3 It is a schematic diagram of the position of the embedding sleeve of the precast concrete pile column of the present invention; Figure 4 It is a schematic diagram of the position of the fixing sleeve of the precast concrete pile column of the present invention; Figure 5 It is a schematic diagram of the position of the limiting cavity of the precast concrete pile column of the present invention; Figure 6 It is a structural schematic diagram of a positioning tooth 1 and a positioning groove 1 of a precast concrete pile column of the present invention; Figure 7 It is a structural schematic diagram of the piling auxiliary cone head of the precast concrete pile column of the present invention; Figure 8 It is a structural schematic diagram of the hammer auxiliary head of the precast concrete pile column of the present invention.
[0019] Among them, 1. Concrete cylinder; 2. Steel mesh cylinder; 3. Chassis; 4. Closing plate; 5. Fixing sleeve; 6. Positioning tooth 1; 7. Concrete nail; 8. Limiting cavity; 9. Pile driving auxiliary cone head; 10. Positioning tooth 2; 11. Embedding sleeve; 12. Hammering auxiliary head. DETAILED DESCRIPTION
[0020] 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.
[0021] Example: As one aspect of this application, please see the attached Figure 1 -Attached Figure 7 The embodiment of the present invention provides a precast concrete pile column, including a steel mesh tube 2, which is welded by multiple steel bars. The outer wall of the steel mesh tube 2 is poured with a concrete cylinder 1, and a through-type pouring cavity is reserved inside the concrete cylinder 1 for pouring concrete after the pile driving is completed. The top and bottom sides of the steel mesh tube 2 are connected to the chassis 3, and the separated sides of the chassis 3 on both sides are provided with a sealing plate 4, a positioning tooth 6 fixedly connected to the top side of the top side sealing plate 4 and a positioning groove 1 provided on the bottom side of the bottom side sealing plate 4, and the positioning tooth 6 is adapted to the specifications of the positioning groove 1, so as to align and position the two precast concrete pile columns when they are welded, and reduce the deviation when piling, so that the multiple precast concrete pile columns are subjected to balanced force.
[0022] A plurality of fixing sleeves 5 are respectively fixedly connected to the separated sides of the two chassis 3, and both ends of the steel mesh tube 2 are sleeved inside the fixing sleeves 5. The separated ends of the fixing sleeves 5 on both sides penetrate the separated sides of the closing plates 4 on both sides, and are threadedly connected with screw sleeves, which are tightly pressed against the closing plates 4. The structure of the fixing sleeves 5 is an expansion sleeve with a crack, which is normally in a cracked expansion state. After the two ends of the steel mesh tube 2 are inserted into the fixing sleeves 5, the closing plates 4 are sleeved on the chassis 3, and the fixing sleeves 5 are inserted into the closing plates 4, so that the fixing sleeves 5 close and fix the two ends of the steel mesh tube 2, and then the screw sleeves are tightened on the threaded structure on the fixing sleeves 5, so that the fixing sleeves 5 are further closed and fixed, thereby the two ends of the steel mesh tube 2 are bitten and fixed. After the pouring of the concrete cylinder 1 is completed, the screw sleeves can be recycled and reused.
[0023] A plurality of limiting cavities 8 are provided inside the sealing disk 4 and an embedding sleeve 11 is fixedly connected to the inner wall of the chassis 3. A plurality of concrete nails 7 are provided on the top side of the concrete cylinder 1. The concrete nails 7 are located inside the limiting cavities 8. The bottom end of the embedding sleeve 11 is provided inside the concrete cylinder 1. When the concrete cylinder 1 is cast, the concrete will wrap the embedding sleeve 11. The L-shaped section structure of the embedding sleeve 11 will hook the concrete cylinder 1, thereby fixing the chassis 3 connected to the embedding sleeve 11. The concrete will also form a matching concrete nail 7 in the limiting cavity 8 with a T-shaped section, thereby fixing the sealing disk 4 with the limiting cavity 8.
[0024] The top side of the piling auxiliary cone head 9 used to assist piling is fixedly connected with a positioning tooth 2 10, and the positioning tooth 2 10 has the same specifications as the positioning tooth 1 6. The conical piling auxiliary cone head 9 helps to provide additional force to the soil in the foundation pit during piling, thereby facilitating the driving of precast concrete piles.
[0025] A positioning groove 2 is provided on the bottom side of the hammer auxiliary head 12. The positioning groove 2 has the same specifications as the positioning groove 1 and is used to provide a stable force-bearing surface during piling, to prevent the top structure of the precast concrete pile column from being directly deformed and offset by the force of piling, and to prevent subsequent clamping positioning from being offset.
[0026] The piling auxiliary cone head 9 and the hammer auxiliary head 12 are both external installation modules, and are matched with the model of the prefabricated concrete pile column, wherein the hammer auxiliary head 12 can be recycled.
[0027] Based on the precast concrete piles provided above, as another aspect of the present application, a method for connecting inner supports of reinforced concrete for foundation pit support comprises the following steps: Step 1: First, carry out the construction of the external support structure of the foundation pit and the excavation of the foundation pit, construct the underground continuous wall along the outer side of the foundation pit excavation line, and then excavate a layer of foundation pit soil; Step 2: construct horizontal ring beams and horizontal inner supports to form the support structure inside the foundation pit, excavate to the designed depth, and clean the bottom side of the foundation pit; Step 3: First, put the pile driving auxiliary cone head 9 into the foundation pit, then drive the precast concrete pile into the foundation pit, align the positioning groove 1 on the bottom side of the sealing plate 4 of the precast concrete pile with the positioning tooth 2 10 on the pile driving auxiliary cone head 9, and clamp them; Step 4: Use a pile driver to drive the precast concrete pile. Before the pile driving work is carried out, the hammer auxiliary head 12 is preferably aligned with the top side of the precast concrete pile and placed so that the positioning groove 2 on the hammer auxiliary head 12 is clamped on the positioning tooth 1 6 to protect the structure on the top side of the precast concrete pile from deformation. Then, the pile is driven into the depth of the foundation pit. After the pile is driven to the specified depth, the hammer auxiliary head 12 is removed; Step 5: After one of the precast concrete piles is driven, a preset precast concrete pile is added above the precast concrete pile to be merged, and the positioning grooves 1 and the positioning teeth 1 6 of the two precast concrete piles are engaged and positioned, and then the surface of the connection between the two precast concrete piles is cleaned, and the joint is welded and fixed, and step 4 is repeated; Step 6. After completing the designed depth of the internal support piles, choose either pouring concrete into the pouring cavity of the precast concrete piles or not pouring concrete as a follow-up treatment according to the design requirements, and then clean the surrounding area of the foundation pit.
[0028] 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. Precast concrete pile, characterized in that: The invention comprises a steel mesh tube (2), wherein the steel mesh tube (2) is welded from a plurality of steel bars, the outer wall of the steel mesh tube (2) is poured with a concrete cylinder (1), and a through-type pouring cavity is left inside the concrete cylinder (1) for pouring concrete after the piling is completed, the top and bottom sides of the steel mesh tube (2) are connected to a chassis (3) via a fixing assembly, and a sealing plate (4) is provided on the separated side of the chassis (3) on both sides, and the sealing plates (4) on both sides are positioned and engaged by a positioning assembly, so as to align and position two precast concrete piles when welding them, and reduce deviation when piling, so as to balance the forces on the plurality of precast concrete piles, and the chassis (3) and the sealing plate (4) are embedded and fixed with the concrete cylinder (1) via an embedding assembly.
2. The precast concrete pile according to claim 1, characterized in that: The fixing assembly comprises a plurality of fixing sleeves (5) respectively fixedly connected to the separated sides of the two chassis (3); both ends of the steel mesh tube (2) are sleeved inside the fixing sleeves (5); the separated ends of the fixing sleeves (5) on both sides penetrate the separated sides of the sealing plates (4) on both sides and are threadedly connected with screw sleeves, and the screw sleeves are tightly pressed against the sealing plates (4).
3. The precast concrete pile according to claim 1, characterized in that: The positioning assembly comprises a positioning tooth one (6) fixedly connected to the top side of the sealing disk (4) and a positioning groove one provided on the bottom side of the sealing disk (4), wherein the positioning tooth one (6) is compatible with the specifications of the positioning groove one.
4. The precast concrete pile according to claim 1, characterized in that: The interlocking assembly comprises a plurality of limiting cavities (8) opened inside the sealing plate (4) and an embedding sleeve (11) fixedly connected to the inner wall of the bottom plate (3); a plurality of concrete nails (7) are arranged on the top side of the concrete cylinder (1); the concrete nails (7) are located inside the limiting cavities (8); and the bottom end of the embedding sleeve (11) is arranged inside the concrete cylinder (1).
5. The precast concrete pile according to claim 3, characterized in that: It also comprises a pile driving auxiliary cone head (9) for assisting pile driving, wherein the top side of the pile driving auxiliary cone head (9) is fixedly connected with a second positioning tooth (10), and the second positioning tooth (10) has the same specifications as the first positioning tooth (6).
6. The precast concrete pile according to claim 3, characterized in that: It also comprises a hammering auxiliary head (12), wherein a second positioning groove is provided on the bottom side of the hammering auxiliary head (12), and the second positioning groove has the same specifications as the first positioning groove.
7. A method for connecting inner supports of reinforced concrete for foundation pit support, using the precast concrete pile column as claimed in any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: First, carry out the construction of the external support structure of the foundation pit and the excavation of the foundation pit, construct the underground continuous wall along the outer side of the foundation pit excavation line, and then excavate a layer of foundation pit soil; Step 2: construct horizontal ring beams and horizontal inner supports to form the support structure inside the foundation pit, excavate to the designed depth, and clean the bottom side of the foundation pit; Step 3: firstly, insert the pile driving auxiliary cone head (9) into the foundation pit, then drive the precast concrete pile into the foundation pit, align the positioning groove 1 on the bottom side of the sealing plate (4) of the precast concrete pile with the positioning tooth 2 (10) on the pile driving auxiliary cone head (9) for clamping; Step 4: Use a pile driver to drive the precast concrete piles into the deep end of the foundation pit; Step 5: After one of the precast concrete piles is driven, a preset precast concrete pile is added above the precast concrete pile to merge them, and step 4 is repeated; Step 6: After completing the designed internal support pile filling depth, clean the surrounding area of the foundation pit.
8. The method for connecting inner supports of reinforced concrete for foundation pit support according to claim 7, characterized in that: In the fourth step, before the pile driving work is carried out, the hammer auxiliary head (12) is preferably aligned with the top side of the precast concrete pile column and placed so that the second positioning groove on the hammer auxiliary head (12) is engaged with the first positioning tooth (6) to protect the structure on the top side of the precast concrete pile column from deformation.
9. The method for connecting inner supports of reinforced concrete for foundation pit support according to claim 7, characterized in that: After adding a preset precast concrete pile column above the precast concrete pile column in step 5, the positioning groove 1 and the positioning tooth 1 (6) of the two precast concrete pile columns are engaged and positioned, and then the surface of the connection between the two precast concrete pile columns is cleaned and the joint is welded and fixed.
10. The method for connecting inner supports of reinforced concrete for foundation pit support according to claim 7, characterized in that: After the designed inner support pile filling depth is completed in step 6, either pouring concrete into the pouring cavity of the precast concrete pile column or not pouring concrete is selected as a subsequent process according to the design requirements.