Layered annular post-grouting structure of uplift and compression resistant cast-in-place pile
By setting multiple annular and longitudinal grouting pipes on the reinforcing cage, the uniform distribution of grout is achieved, solving the problem of uneven grouting in cast-in-place piles and improving the pull-out and compressive strength of the cast-in-place piles.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-07
AI Technical Summary
In existing grouting technology for cast-in-place piles, the uneven distribution of grout leads to poor grouting effect, making it difficult to achieve a tight bond between the cast-in-place pile and the soil, and thus failing to meet the requirements for comprehensive reinforcement.
Multiple annular grouting pipes and longitudinal grouting pipes are installed on the reinforcing cage. The annular grouting pipes are arranged with circumferential grouting holes, and the longitudinal grouting pipes are connected to the annular grouting pipes. The bottom grouting holes extend to the bottom of the reinforcing cage to ensure that the grout is evenly distributed on the side and bottom of the cast-in-place pile.
By uniformly distributing the grout, the reinforcement effect on the sides and bottom of the cast-in-place pile is improved, enhancing the pull-out and compressive strength of the cast-in-place pile and ensuring maximum coverage of the grouting area.
Smart Images
Figure CN224092508U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of cast-in-place piles, and more specifically, to a layered annular post-grouting structure for pull-out and compression-resistant cast-in-place piles. Background Technology
[0002] In the field of cast-in-place pile technology, grouting is one of the important means to improve the bearing capacity of pile foundations, and the quality of the grouting effect also affects the overall construction efficiency.
[0003] Currently, traditional grouting techniques for cast-in-place piles mainly include pile bottom grouting and pile side grouting. Although these methods have improved the bearing capacity of cast-in-place piles to some extent, they still have shortcomings in current practical applications.
[0004] In existing technology applications, the arrangement of grouting pipes is relatively simple. For example, for pile bottom grouting, only one grouting hole is usually set at the bottom of the cast-in-place pile. The number of grouting pipes for pile side grouting is limited and the grouting holes are unevenly distributed, resulting in uneven distribution of grout at the bottom and sides of the cast-in-place pile. Some areas may be under-grouted, while other areas may be over-grouted, resulting in poor overall grouting effect of the cast-in-place pile.
[0005] In addition, the limited number of grouting pipes and the distribution of grouting holes result in a relatively narrow grouting range, making it difficult to achieve a tighter bond between the cast-in-place pile and the soil, thus failing to meet the requirements for comprehensive reinforcement. Utility Model Content
[0006] The purpose of this invention is to provide a layered annular post-grouting structure for cast-in-place piles that are resistant to pull-out and compression, in order to solve the problem of poor grouting effect in existing technologies.
[0007] This utility model is implemented as follows: a layered annular post-grouting structure for tension and compression grouting piles includes a bottom grouting pipe arranged on a reinforcing cage and multiple annular grouting pipes arranged around the outer periphery of the reinforcing cage. The multiple annular grouting pipes are arranged at intervals along the axial direction of the reinforcing cage. Each of the annular grouting pipes is connected to a longitudinal grouting pipe. The bottom grouting pipe and the longitudinal grouting pipe are respectively arranged to extend along the axial direction of the reinforcing cage.
[0008] The annular grouting pipe is provided with a plurality of outwardly arranged circumferential grouting holes, which are spaced apart along the circumference of the annular grouting pipe; the bottom of the bottom grouting pipe has a bottom grouting hole that extends to the bottom of the reinforcing cage.
[0009] Furthermore, the circumferential grouting holes are arranged in a flat shape along the height direction of the annular grouting pipe.
[0010] Furthermore, the annular grouting pipe has an outer wall facing away from the reinforcing cage, and a plurality of the circumferential grouting holes are arranged on the outer wall.
[0011] Furthermore, a T-joint is connected to the bottom of the longitudinal grouting pipe, and the two ends of the T-joint are respectively connected to the annular grouting pipe so that the longitudinal grouting pipe and the annular grouting pipe are connected.
[0012] Furthermore, the tee head is fixedly inserted into the reinforcing cage.
[0013] Furthermore, the steel reinforcement cage is enclosed to form a cage space, and the bottom grouting pipe is installed in the cage space and fixed on the inner wall of the steel reinforcement cage.
[0014] Furthermore, the cage space is provided with two bottom grouting pipes, which are arranged symmetrically relative to each other.
[0015] Furthermore, the lower part of the bottom grouting pipe has a lower section, the bottom grouting hole is formed at the bottom of the lower section, and a plurality of lower grouting holes are provided on the outer periphery of the lower section, the plurality of lower grouting holes being arranged at intervals around the lower section in a circumferential manner.
[0016] Furthermore, the plurality of the lower grouting holes are arranged vertically and vertically offset along the axial direction of the lower section.
[0017] Furthermore, the bottom of the lower section is covered with a cover plate, the middle of which forms the bottom grouting hole, and the outer periphery of the cover plate has a closed annular plate; a cylinder is provided on the annular plate, the bottom of which is fixed to the annular plate and aligned with the bottom grouting hole, and the top of which extends upward.
[0018] The cylinder has a cavity that extends through the top of the cylinder to form a top opening. The bottom of the cavity is connected to a bottom grouting hole. There is an annular area between the cylinder and the inner wall of the lower section.
[0019] Compared with existing technologies ， The layered annular post-grouting structure for anti-pull-out and anti-compression cast-in-place piles provided by this utility model, by setting multiple annular grouting pipes around the outer periphery of the reinforcing cage and arranging multiple outward-facing circumferential grouting holes on the annular grouting pipes, allows the grout to be evenly distributed along the circumference of the annular grouting pipes into the soil on the side of the cast-in-place pile, ensuring that the soil on the side of the cast-in-place pile can be fully reinforced, thereby improving the grouting effect.
[0020] In addition, by connecting the longitudinal grouting pipe with the annular grouting pipe, the longitudinal grouting pipe and the bottom grouting pipe are arranged to extend along the axial direction of the reinforcing cage, and the bottom grouting hole extends to the bottom of the reinforcing cage, so as to maximize the grouting range. While reinforcing the bottom of the cast-in-place pile and improving its bearing capacity, it can cover the entire cast-in-place pile, making the cast-in-place pile and the soil more tightly bonded, thereby effectively improving the pull-out and compressive strength of the cast-in-place pile. Attached Figure Description
[0021] Figure 1 This is a front view schematic diagram of the layered annular post-grouting structure of the anti-pull-out and anti-compression cast-in-place pile provided by this utility model;
[0022] Figure 2 This is a three-dimensional structural diagram of the annular grouting pipe provided by this utility model.
[0023] Figure 3 This is a cross-sectional view of the lower section provided by this utility model;
[0024] In the figure: 100 steel cage, 101 cage space, 102 annular grouting pipe, 103 longitudinal grouting pipe, 104 circumferential grouting hole, 105 facing the outer side wall; 106 tee head;
[0025] Bottom grouting pipe 200, bottom grouting hole 201, lower section 202, lower grouting hole 203, cover plate 204, annular plate 205, cylinder 206, cylinder cavity 207, top opening 208, annular area 209. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0027] The implementation of this utility model will be described in detail below with reference to specific embodiments.
[0028] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0029] Reference Figure 1-3 The image shown is a preferred embodiment of the present invention.
[0030] The layered annular post-grouting structure for tension and compression cast-in-place piles includes a bottom grouting pipe 200 arranged on a reinforcing cage 100 and multiple annular grouting pipes 102 arranged around the outer periphery of the reinforcing cage 100. The multiple annular grouting pipes 102 are arranged at intervals along the axial direction of the reinforcing cage 100. Each annular grouting pipe 102 is connected to a longitudinal grouting pipe 103. The bottom grouting pipe 200 and the longitudinal grouting pipe 103 extend along the axial direction of the reinforcing cage 100, respectively.
[0031] The annular grouting pipe 102 is provided with a plurality of outwardly arranged circumferential grouting holes 104, which are arranged at intervals along the circumference of the annular grouting pipe 102; the bottom of the bottom grouting pipe 200 has a bottom grouting hole 201, which extends to the bottom of the reinforcing cage 100.
[0032] The layered annular post-grouting structure for the pull-out and compression-resistant cast-in-place pile provided above, by setting multiple annular grouting pipes 102 around the outer periphery of the reinforcing cage 100 and arranging multiple outward-facing circumferential grouting holes 104 on the annular grouting pipes 102, allows the grout to be evenly distributed into the soil on the side of the cast-in-place pile along the circumference of the annular grouting pipes 102, ensuring that the soil on the side of the cast-in-place pile can be fully reinforced, thereby improving the grouting effect;
[0033] In addition, the longitudinal grouting pipe 103 is connected to the annular grouting pipe 102. The longitudinal grouting pipe 103 and the bottom grouting pipe 200 are respectively arranged to extend along the axial direction of the reinforcing cage 100. The bottom grouting hole 201 extends to the bottom of the reinforcing cage 100, thereby maximizing the grouting range. While reinforcing the bottom of the cast-in-place pile to improve its bearing capacity, it can also cover the entire cast-in-place pile, making the cast-in-place pile more tightly bonded to the soil, thereby effectively improving the pull-out and compressive strength of the cast-in-place pile.
[0034] In this embodiment, the circumferential grouting holes 104 are arranged in a flat shape along the height direction of the annular grouting pipe 102.
[0035] This allows the grout to form a wider coverage area when it is sprayed out, thus distributing it more evenly into the soil on the side of the cast-in-place pile, effectively improving the uniformity and coverage of the grouting.
[0036] In this embodiment, the annular grouting pipe 102 has an outer wall 105 facing away from the reinforcing cage 100, and a plurality of circumferential grouting holes 104 are provided on the outer wall 105.
[0037] By setting the grouting holes on the outer side wall 105, it is possible to ensure that the grout acts directly on the soil on the side of the cast-in-place pile, avoiding the grout from stagnating or being unevenly distributed inside the reinforcing cage 100, thereby improving the grouting effect.
[0038] In this embodiment, a T-joint 106 is connected to the bottom of the longitudinal grouting pipe 103, and the two ends of the T-joint 106 are respectively connected to the annular grouting pipe 102 so that the longitudinal grouting pipe 103 and the annular grouting pipe 102 are connected.
[0039] By connecting the longitudinal grouting pipe 103 and the annular grouting pipe 102 through the tee head 106, the grout can be evenly distributed in the longitudinal and circumferential directions, further optimizing the distribution path of the grout and improving the grouting efficiency.
[0040] In this embodiment, the tee head 106 is fixedly inserted into the steel cage 100.
[0041] This ensures the stability of the grouting pipe connection structure, preventing displacement or damage to the grouting pipe due to external forces during construction, thus guaranteeing the smooth progress of the grouting process.
[0042] In this embodiment, the reinforcing cage 100 encloses a cage space 101, and the bottom grouting pipe 200 is disposed in the cage space 101 and fixed on the inner wall of the reinforcing cage 100.
[0043] This ensures that the grout can directly act on the bottom of the cast-in-place pile, while preventing grout leakage outside the reinforcing cage 100, thus improving the accuracy and efficiency of grouting.
[0044] In this embodiment, the cage space 101 is provided with two bottom grouting pipes 200, which are arranged symmetrically relative to each other.
[0045] The symmetrical arrangement of the bottom grouting pipes 200 ensures the uniformity of the grouting process and allows the steel cage 100 to maintain overall stability during the grouting process.
[0046] In this embodiment, the lower part of the bottom grouting pipe 200 has a lower section 202, and a bottom grouting hole 201 is formed at the bottom of the lower section 202. A plurality of lower grouting holes 203 are provided on the outer periphery of the lower section 202, and the plurality of lower grouting holes 203 are arranged around the lower section 202 at intervals along the circumference.
[0047] This allows the grout to be injected into the bottom of the pile from both the bottom and the side, further expanding the grouting range and improving the grouting effect.
[0048] In this embodiment, multiple lower grouting holes 203 are arranged vertically and vertically offset along the axial direction of the lower section 202.
[0049] By staggering the grouting holes vertically, the grout can be evenly distributed at different heights, avoiding grout concentration in a certain area, thereby further optimizing the grout distribution effect and improving the uniformity and stability of grouting.
[0050] In this embodiment, the bottom of the lower section 202 is covered by a cover plate 204, and a bottom grouting hole 201 is formed in the middle of the cover plate 204. The outer periphery of the cover plate 204 has a closed annular plate 205. A cylinder 206 is provided on the annular plate 205. The bottom of the cylinder 206 is fixed on the annular plate 205 and aligned with the bottom grouting hole 201. The top of the cylinder 206 extends upward.
[0051] The cylinder 206 has a cavity 207 that extends through the top of the cylinder 206 to form a top opening 208. The bottom of the cavity 207 is connected to the bottom grouting hole 201. There is an annular region 209 between the inner wall of the cylinder 206 and the lower section 202.
[0052] This effectively guides the grout from the bottom grouting hole 201 into the cylinder 207, and distributes it evenly to the bottom of the cast-in-place pile through the annular area 209. This not only optimizes the grout injection path but also improves the uniformity and efficiency of grouting.
[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A layered annular post-grouting structure for tension- and compression-resistant cast-in-place piles, characterized in that, It includes a bottom grouting pipe arranged on the reinforcing cage and a plurality of annular grouting pipes arranged around the outer periphery of the reinforcing cage, the plurality of annular grouting pipes being spaced apart along the axial direction of the reinforcing cage; each of the annular grouting pipes is connected to a longitudinal grouting pipe, and the bottom grouting pipe and the longitudinal grouting pipe are respectively arranged to extend along the axial direction of the reinforcing cage. The annular grouting pipe is provided with a plurality of outwardly arranged circumferential grouting holes, which are arranged at intervals along the circumference of the annular grouting pipe. The bottom of the bottom grouting pipe has a bottom grouting hole that extends to the bottom of the reinforcing cage.
2. The layered annular post-grouting structure for anti-pull-out and anti-compression cast-in-place piles as described in claim 1, characterized in that, The circumferential grouting holes are arranged in a flat shape along the height direction of the annular grouting pipe.
3. The layered annular post-grouting structure for anti-pull-out and anti-compression cast-in-place piles as described in claim 1, characterized in that, The annular grouting pipe has an outer wall facing away from the reinforcing cage, and a plurality of circumferential grouting holes are provided on the outer wall.
4. The layered annular post-grouting structure for pull-out and compression-resistant cast-in-place piles as described in any one of claims 1-3, characterized in that, The bottom of the longitudinal grouting pipe is connected to a T-joint, and the two ends of the T-joint are respectively connected to the annular grouting pipe so that the longitudinal grouting pipe and the annular grouting pipe are connected.
5. The layered annular post-grouting structure for anti-pull-out and anti-compression cast-in-place piles as described in claim 4, characterized in that, The tee head is fixedly inserted into the steel cage.
6. The layered annular post-grouting structure for anti-pull-out and anti-compression cast-in-place piles as described in any one of claims 1-3, characterized in that, The steel reinforcement cage is enclosed to form a cage space, and the bottom grouting pipe is set in the cage space and fixed on the inner side wall of the steel reinforcement cage.
7. The layered annular post-grouting structure for pull-out and compression-resistant cast-in-place piles as described in claim 6, characterized in that, The cage space is provided with two bottom grouting pipes, which are arranged symmetrically relative to each other.
8. The layered annular post-grouting structure for pull-out and compression-resistant cast-in-place piles as described in any one of claims 1-3, characterized in that, The bottom grouting pipe has a lower section, and the bottom grouting hole is formed at the bottom of the lower section. The lower section has a plurality of lower grouting holes on its outer periphery, and the plurality of lower grouting holes are arranged at intervals around the lower section in a circumferential manner.
9. The layered annular post-grouting structure for pull-out and compression-resistant cast-in-place piles as described in claim 8, characterized in that, The multiple lower grouting holes are arranged vertically and vertically offset along the axial direction of the lower section.
10. The layered annular post-grouting structure for pull-out and compression-resistant cast-in-place piles as described in claim 8, characterized in that, The bottom of the lower section is covered by a cover plate, the middle of which forms the bottom grouting hole, and the outer periphery of the cover plate has a closed annular plate; a cylinder is provided on the annular plate, the bottom of which is fixed to the annular plate and aligned with the bottom grouting hole, and the top of which extends upward. The cylinder has a cavity that extends through the top of the cylinder to form a top opening. The bottom of the cavity is connected to a bottom grouting hole. There is an annular area between the cylinder and the inner wall of the lower section.