Alternating grouting pile end post-grouting construction device for cast-in-situ bored pile
Through the drilling and filling pile alternating grouting construction device, open-closed-open alternating grouting is adopted, which solves the problem of insufficient bearing capacity of the pile foundation, and has achieved a significant increase in bearing capacity and friction resistance of the pile foundation, shortens construction time and reduces costs.
Patent Information
- Application Number
- CN202422197312.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The pile end sediment and pile side mud skin of existing drilled piles lead to a reduction in the bearing capacity of the pile foundation. The traditional single grouting process cannot accurately control the grouting area, pressure and quantity, resulting in unstable grouting effect and the degree of improvement in the bearing capacity of a single pile fluctuates greatly.
The drilled pile-in-filled pile alternating grouting construction device is adopted. Through the open-closed-open type alternating grouting method, the soil layer around the pile end is repeatedly penetrated, split and compressed, combined with the capsule cover plate and flexible grouting capsules, the control of fixed areas, quantification and fixed pressure is achieved.
Significantly increase the ultimate bearing capacity and pile side friction resistance of the pile foundation, shorten the pile length or increase the pile spacing, increase the construction speed, reduce construction costs, and improve construction quality.
Smart Images
Figure CN223163860U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pile foundation construction, in particular to a post-grouting construction device for the pile end of an alternately grouted bored cast-in-place pile. Background Technique
[0002] After the drilling construction of a bored cast-in-place pile is completed, pile-end sediment and pile-side mud skin will be formed, reducing the effective bearing capacity of the pile foundation; at present, the general method is to use continuous post-grouting technology at the pile end or pile side to enhance the pile-end and pile-side skin friction, improve the bearing capacity of the pile foundation, and reduce the settlement of the pile body.
[0003] The traditional pile-end post-grouting process generally only uses a single open grouting or capsule grouting method, and it is impossible to accurately control the grouting area, grouting pressure and grouting volume during grouting, resulting in instability of the grouting effect and large fluctuations in the improvement degree of the bearing capacity of a single pile; therefore, in view of the above problems, a post-grouting construction device for the pile end of an alternately grouted bored cast-in-place pile is proposed. Content of the Utility Model
[0004] The problem solved by the utility model is to provide a post-grouting construction device for the pile end of an alternately grouted bored cast-in-place pile. By alternately grouting in the order of open - closed - open, the surrounding soil layer of the pile end is repeatedly penetrated, split and compacted, greatly improving the ultimate bearing capacity of the pile foundation and the pile-side skin friction. It can shorten the pile length or increase the pile spacing, effectively improve the construction speed and save construction costs; at the same time, it can also effectively improve the construction quality.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A post-grouting construction device for the pile end of an alternately grouted bored cast-in-place pile, comprising:
[0007] A capsule cover plate, the bottom end of the capsule cover plate is fixedly installed with an annular baffle by welding, and a flexible grouting capsule is sleeved outside the annular baffle. The end face of the capsule cover plate is respectively provided with an open grouting component and a closed grouting component. The open grouting component is located inside the annular baffle, and the closed grouting component is located inside the flexible grouting capsule;
[0008] An open grouting pipe, the open grouting component includes an open grouting pipe. The two open grouting pipes are respectively inserted and installed on both sides of the end face of the capsule cover plate, and the bottom ends of the two open grouting pipes pass through the capsule cover plate and are connected and installed with a first annular conduit. The first annular conduit is located inside the annular baffle. Open grouting devices are uniformly installed around the bottom end face of the first annular conduit, and a first one-way valve is installed at the center of the bottom end of the open grouting device;
[0009] The closed grouting pipe and the closed grouting assembly include a closed grouting pipe, the two closed grouting pipes are respectively plugged and installed on the other two sides of the end face of the capsule cover, and the bottom ends of the two closed grouting pipes pass through the capsule cover and are connected with a second annular duct, the second annular duct is located at the inner top of the flexible grouting capsule, and closed grouting presses are evenly installed around the bottom end face of the second annular duct, and a second one-way valve is installed in the center of the bottom end of the closed grouting press.
[0010] Furthermore, fixing grooves are provided around the bottom end surface of the capsule cover and around the outer wall of the annular baffle, and fixing brackets are fixedly installed inside the fixing grooves, and several fixing brackets are fixedly connected to the outer wall of the flexible grouting capsule; this facilitates the fixed installation of the flexible grouting capsule between the capsule cover and the annular baffle, thereby improving the convenience of installation and fixation.
[0011] Furthermore, four guide holes are provided on the end face of the capsule cover plate, and wear-resistant bushings are fixedly installed on the inner wall end faces of the guide holes. The outer walls of the open grouting pipe and the closed grouting pipe are fitted and connected to the inner wall end faces of the wear-resistant bushings; this facilitates the installation and connection of the open grouting pipe and the closed grouting pipe, and the wear of the guide holes is effectively reduced by setting the wear-resistant bushings.
[0012] Furthermore, the top end surface of the capsule cover is fixedly installed with a lifting support on all four sides by welding, and the center of the end surface of the lifting support is fixedly installed with a construction hanger by welding, and a lifting through-hole is opened in the center of the end surface of the construction hanger; it is convenient to connect the external lifting equipment with the lifting through-hole, and then lift it to a suitable use position through the lifting support and the construction hanger.
[0013] Furthermore, before the steel cage is suspended, the flexible grouting capsule is in a contracted state; the air inside the flexible grouting capsule is discharged to ensure the pouring quality of the pile end concrete.
[0014] Furthermore, the capsule cover is welded and fixed to the bottom of the steel cage; and the two open grouting pipes and the two closed grouting pipes are respectively connected to the grouting pipes pre-buried on the outside pile side to facilitate grouting.
[0015] The beneficial effects of the present utility model are as follows: For the post-grouting construction device at the pile end of the bored cast-in-place pile with alternating grouting, by grouting alternately in the open - closed - open mode, the open grouting system is used to penetrate and split - grout the formation around the pile end. The cement slurry will bond and solidify with the soil within a certain range of the pile end and the pile side, improving the skin friction of the pile; subsequently, the closed grouting system is used to perform pressure grouting inside the flexible capsule. After the capsule expands, it compacts the pile - end formation to form an enlarged head, improving the bearing capacity of the pile foundation; finally, the open grouting system is used to replenish the grout in the hollow part formed after the expansion of the flexible capsule, which can compact the pile - end formation again; by repeatedly performing penetration, splitting, and compaction on the soil layer around the pile end, the ultimate bearing capacity of the pile foundation and the skin friction of the pile are greatly improved, the pile length can be shortened or the pile spacing can be increased, effectively improving the construction speed and saving construction costs; at the same time, the capsule cover plate and the annular baffle are provided, which have a certain restraining effect on the open - grouting and closed - grouting processes, accurately controlling the cement slurry in a fixed area, with a fixed quantity and a fixed pressure, and improving the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is the first overall structural schematic diagram of the present utility model;
[0017] Figure 2 is the second overall structural schematic diagram of the present utility model;
[0018] Figure 3 is the overall top view of the present utility model;
[0019] Figure 4 is Figure 3 the sectional schematic diagram of A - A in
[0020] Figure 5 is the overall top view of the present utility model;
[0021] Figure 6 is Figure 5 the sectional schematic diagram of B - B in
[0022] LEGEND DESCRIPTION:
[0023] 1. Capsule cover plate; 2. Annular baffle; 3. Guide hole; 4. Open - type grouting assembly; 5. Closed - type grouting assembly; 6. Flexible grouting capsule; 7. Lifting support; 8. Construction hanger; 41. Open - type grouting pipe; 42. First annular conduit; 43. Open - type grouting device; 44. First one - way valve; 45. Fixed support; 51. Closed - type grouting pipe; 52. Second annular conduit; 53. Closed - type grouting device; 54. Second one - way valve. DETAILED IMPLEMENTATION MANNER
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] Specific examples are given below.
[0026] See also Figures 1 to 6 The bored pile alternating grouting pile end post-grouting construction device comprises a capsule cover plate 1, the bottom end of the capsule cover plate 1 is fixedly mounted with an annular baffle 2 by welding, and a flexible grouting capsule 6 is sleeved and mounted on the outer side of the annular baffle 2, and the end faces of the capsule cover plate 1 are respectively provided with an open grouting component 4 and a closed grouting component 5, the open grouting component 4 is located on the inner side of the annular baffle 2, and the closed grouting component 5 is located inside the flexible grouting capsule 6; by arranging the open grouting component 4, it is convenient to grout the annular baffle 2 is grouting filled on the inside to facilitate the penetration and splitting of the surrounding soil layer by cement slurry, thereby improving the bearing capacity of the pile end and the friction resistance of the pile side; and by setting a closed grouting assembly 5, it is convenient to grout and fill the inside of the flexible grouting capsule 6; after the flexible grouting capsule 6 expands, it compacts the stratum at the bottom of the pile end, and finally forms an enlarged head at the pile end; the capsule cover 1 is welded and fixed to the bottom of the steel cage; and the two open grouting pipes 41 and the two closed grouting pipes 51 are respectively connected to the grouting pipes pre-buried on the outside pile side to facilitate grouting;
[0027] The open grouting assembly 4 includes an open grouting pipe 41, two of the open grouting pipes 41 are respectively plugged and installed on both sides of the end surface of the capsule cover 1, and the bottom ends of the two open grouting pipes 41 pass through the capsule cover 1 and are connected to a first annular conduit 42, the first annular conduit 42 is located on the inner side of the annular baffle 2, and open grouting devices 43 are evenly installed around the bottom end surface of the first annular conduit 42, and a first one-way valve 44 is installed in the center of the bottom end of the open grouting device 43; the external grouting pipe is connected to the open grouting pipe 41, so that the cement slurry is transported to the first annular conduit 42 through the open grouting pipe 41, and the cement slurry can be discharged through the open grouting device 43 and the first one-way valve 44;
[0028] The closed grouting assembly 5 includes a closed grouting pipe 51. The two closed grouting pipes 51 are respectively inserted and installed on the other two sides of the end face of the capsule cover plate 1. The bottom ends of the two closed grouting pipes 51 pass through the capsule cover plate 1 and are connected and installed with a second annular conduit 52. The second annular conduit 52 is located at the inner top of the flexible grouting capsule 6. The bottom end face of the second annular conduit 52 is evenly installed with closed grouting devices 53 around it, and a second one-way valve 54 is installed at the center of the bottom end of the closed grouting device 53; The external grouting pipe is connected to the closed grouting pipe 51, so that the cement slurry is transported to the second annular conduit 52 through the closed grouting pipe 51, and the cement slurry can be discharged through the closed grouting device 53 and the second one-way valve 54;
[0029] During use, first, the open grouting assembly 4 is used to perform permeation and splitting grouting on the formation around the pile end. The cement slurry will be cemented and solidified with the soil within a certain range of the pile end and the pile side, improving the skin friction of the pile. When the total grouting volume reaches 60% of the design value and the grouting pressure reaches 6.0 Mpa, the grouting can be stopped. The open grouting duration is generally about 1.5 - 2 hours; Subsequently, the closed grouting assembly 5 is used to perform pressure grouting inside the flexible grouting capsule 6. After the capsule expands, it compacts the pile end formation to form an enlarged head, improving the bearing capacity of the pile foundation. When the internal grouting volume of the flexible grouting capsule 6 reaches about 0.5 - 0.6 t, or the grouting pressure reaches 5.0 Mpa, the grouting can be stopped. The closed grouting duration is generally about 1 hour; Finally, the open grouting assembly 4 is used to replenish the slurry in the hollow part formed after the expansion of the flexible grouting capsule 6, and at the same time, the pile end formation can be compacted again. When the grouting pressure reaches 9.0 Mpa, the grouting can be stopped. The open grouting duration is generally about 1 hour; Grouting is alternately carried out in the way of open grouting - closed grouting - open grouting, repeatedly performing permeation, splitting and compaction on the soil layer around the pile end, greatly improving the ultimate bearing capacity of the pile foundation and the skin friction of the pile, shortening the pile length or increasing the pile spacing, effectively improving the construction speed and saving construction costs.
[0030] Fixing grooves are provided around the bottom end face of the capsule cover plate 1 and around the outer wall of the annular baffle 2. Fixed brackets 45 are fixedly installed inside the fixing grooves, and several fixed brackets 45 are fixedly connected to the outer wall of the flexible grouting capsule 6; It is convenient to fixedly install the flexible grouting capsule 6 between the capsule cover plate 1 and the annular baffle 2, improving the convenience of installation and fixation.
[0031] Four guiding holes 3 are provided on the end face of the capsule cover plate 1. Wear-resistant bushings are fixedly installed on the inner wall end faces of the guiding holes 3. The outer walls of the open grouting pipe 41 and the closed grouting pipe 51 are in fit connection with the inner wall end faces of the wear-resistant bushings; It is convenient to install and connect the open grouting pipe 41 and the closed grouting pipe 51, and the wear of the guiding holes 3 is effectively reduced by providing wear-resistant bushings.
[0032] Around the top end face of the capsule cover plate 1, hoisting supports 7 are fixedly installed by welding, and in the center of the end face of the hoisting support 7, a construction hanger 8 is fixedly installed by welding. A hoisting through hole is formed in the center of the end face of the construction hanger 8; it is convenient to connect an external hoisting device to the hoisting through hole, and then hoist and move it to a suitable use position through the hoisting support 7 and the construction hanger 8.
[0033] Before hoisting the steel reinforcement cage, the flexible grouting capsule 6 is in a contracted state; by discharging the air inside the flexible grouting capsule 6, the pouring quality of the pile tip concrete can be ensured.
[0034] Working principle: The open grouting assembly 4 is used to carry out permeation and splitting grouting on the formation around the pile tip. The cement slurry will be cemented and solidified with the soil within a certain range of the pile tip and the pile side, improving the frictional resistance of the pile circumference. When the total grouting volume reaches 60% of the design value and the grouting pressure reaches 6.0 Mpa, the grouting can be stopped. The duration of open grouting is generally about 1.5 - 2 h; subsequently, the closed grouting assembly 5 is used to carry out pressure grouting inside the flexible grouting capsule 6. After the capsule expands, it compacts the formation at the pile tip to form an enlarged head, improving the bearing capacity of the pile foundation. When the grouting volume inside the flexible grouting capsule 6 reaches about 0.5 - 0.6 t or the grouting pressure reaches 5.0 Mpa, the grouting can be stopped. The duration of closed grouting is generally about 1 h; finally, the open grouting assembly 4 is used to replenish the slurry in the hollow part formed after the expansion of the flexible grouting capsule 6, and at the same time, the formation at the pile tip can be compacted again. When the grouting pressure reaches 9.0 Mpa, the grouting can be stopped. The duration of open grouting is generally about 1 h; Grouting is alternately carried out in the way of open grouting - closed grouting - open grouting, repeatedly carrying out permeation, splitting and compaction on the soil layer around the pile tip, greatly improving the ultimate bearing capacity of the pile foundation and the frictional resistance of the pile side, shortening the pile length or increasing the pile spacing, effectively improving the construction speed and saving the construction cost.
[0035] The above is only the preferred specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent replacement or change, and should be covered within the protection scope of the present utility model.
Claims
1. The post-grouting construction device for the pile tip of alternate grouting of bored cast-in-place piles is characterized in that, include: A capsule cover plate (1), wherein the bottom end of the capsule cover plate (1) is fixedly mounted with an annular baffle plate (2) by welding, and a flexible grouting capsule (6) is sleeved and mounted on the outer side of the annular baffle plate (2); An open grouting assembly (4) and a closed grouting assembly (5), wherein the end surfaces of the capsule cover plate (1) are respectively provided with the open grouting assembly (4) and the closed grouting assembly (5), the open grouting assembly (4) is located on the inner side of the annular baffle (2), and the closed grouting assembly (5) is located inside the flexible grouting capsule (6); An open grouting pipe (41), wherein the open grouting assembly (4) comprises an open grouting pipe (41), two of the open grouting pipes (41) are respectively plugged and installed on both sides of the end surface of the capsule cover (1), and the bottom ends of the two open grouting pipes (41) pass through the capsule cover (1) and are connected to a first annular conduit (42); An open grouting device (43), wherein the first annular conduit (42) is located on the inner side of the annular baffle (2), the open grouting devices (43) are evenly installed around the bottom end surface of the first annular conduit (42), and a first one-way valve (44) is installed at the center of the bottom end of the open grouting device (43); A closed grouting pipe (51), the closed grouting assembly (5) comprises a closed grouting pipe (51), two closed grouting pipes (51) are respectively plugged and installed on the other two sides of the end surface of the capsule cover (1), and the bottom ends of the two closed grouting pipes (51) pass through the capsule cover (1) and are connected to a second annular conduit (52); The second annular conduit (52) is located at the inner top of the flexible grouting capsule (6), and closed grouting devices (53) are evenly installed around the bottom end surface of the second annular conduit (52), and a second one-way valve (54) is installed at the center of the bottom end of the closed grouting device (53).
2. The post - grouting construction device for the pile tip of an alternative grouting bored cast - in - place pile according to claim 1, characterized in that, Fixing grooves are provided around the bottom end surface of the capsule cover (1) and around the outer wall of the annular baffle (2), and fixing brackets (45) are fixedly installed inside the fixing grooves, and a plurality of fixing brackets (45) are fixedly connected to the outer wall of the flexible grouting capsule (6).
3. The post-grouting construction device for the pile tip of bored cast-in-place piles with alternate grouting according to claim 2, characterized in that, The end surface of the capsule cover plate (1) is provided with four guide holes (3), the inner wall end surfaces of the guide holes (3) are fixedly mounted with wear-resistant bushings, and the outer walls of the open grouting pipe (41) and the closed grouting pipe (51) are fitted and connected to the inner wall end surfaces of the wear-resistant bushings.
4. The post - grouting construction device for the pile tip of bored cast - in - place piles with alternating grouting according to claim 3, characterized in that, The top end surface of the capsule cover plate (1) is fixedly mounted with a hoisting support (7) by welding, and the center of the end surface of the hoisting support (7) is fixedly mounted with a construction hanger (8) by welding, and the center of the end surface of the construction hanger (8) is provided with a hoisting through hole.
5. The post - grouting construction device for the pile tip of bored cast - in - place piles by alternate grouting according to claim 4, characterized in that, Before the steel cage is suspended, the flexible grouting capsule (6) is in a contracted state.
6. The post-grouting construction device for the pile tip of an alternate grouting bored cast-in-place pile according to claim 5, characterized in that, The capsule cover plate (1) is welded and fixed to the bottom of the steel cage; and the two open grouting pipes (41) and the two closed grouting pipes (51) are respectively connected to the grouting pipes pre-buried on the outside pile side.