Bamboo pole body anchor rod
Through the design of bamboo pole anchors combining gelled materials and steel strands, the problem of anchor cable recycling is solved, high carbon yield and soil deformation control is achieved, carbon emissions and obstacles are reduced, and project safety and quality are improved. .
Patent Information
- Application Number
- CN202420471081.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-12
AI Technical Summary
Existing anchor cables are difficult to recycle in foundation pit projects, resulting in waste of resources and high carbon emissions, and remain in the soil to become obstacles to underground engineering construction. Existing recyclable anchor cables have material damage, limited recycling space and cost High problem.
Using bamboo pole anchor rod, the bamboo joint cavity is set at one end of the bamboo pole and the steel strand is fixed with gelled material, combined with prestressed steel bars to improve bond strength and tensile performance, and a reinforcement ring is set on the outer wall of the bamboo pole to enhance the annular load. Performance, leverages bamboo renewability and shear resistance to reduce carbon emissions and obstacle impact.
The high carbon yield of bamboo anchors is achieved, carbon emissions are reduced, and bamboo is easily damaged and degraded, without affecting subsequent land development, and the soil deformation is controlled through prestressing, which improves the safety and quality of the project.
Smart Images
Figure CN222140057U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of anchor rods, in particular to a bamboo pole anchor rod. Background Art
[0002] In today's foundation pit projects, anchor-pull support structures and soil nail walls are widely used. The anchor-pull support structure provides a fulcrum for the retaining structure by setting anchor rods to ensure the stability of the soil on the air side, and the soil nail wall stabilizes itself by reinforcing the target soil. These two methods can provide more space for the subsequent foundation pit excavation and main structure construction stages, improve construction speed and efficiency, and have good economic benefits.
[0003] However, due to the temporary nature of the foundation pit project, these anchor cables are permanently abandoned on site after the foundation pit is backfilled. Conventional anchor rods, anchor cables, and soil nail rods are all made of steel, and the production of steel will generate a large amount of carbon dioxide emissions.
[0004] Moreover, the anchor rods, anchor cables and soil nails that are not recycled will also form underground obstacles in the foundation soil, affecting the subsequent underground engineering construction and being unfavorable for sustainable development. Although people have developed recyclable anchor cables to address this problem, they still have several unavoidable defects: First, most recyclable anchor cables are pressure-type anchor cables, and their bearing heads will remain underground to form obstacles after the anchor cables are recycled; second, the steel strands of recyclable anchor cables may be damaged to a certain extent after recycling, which will affect their reuse; third, the main materials of recyclable anchor cables are steel strands or steel bars, which are high-carbon materials; fourth, the space between the main structure and the supporting structure in the foundation pit is small, and there is a limited recycling space, and the recycling of anchor cables will affect the construction period; fifth, the cost of recyclable anchor cables is high, which will increase the cost of the project.
[0005] The essence of some bamboo pole soil nail support systems is a passive force structure, which only works when the foundation pit soil is displaced, and has the disadvantage of weak deformation control ability. The utility model can apply prestress to the reinforced soil, actively control the deformation of the foundation pit, and significantly improve the safety and quality of the project.
[0006] In summary, the existing conventional anchor cables are not easy to recycle, which not only causes waste of resources and high carbon emissions, but also the anchor cables left in the soil will become obstacles to subsequent underground engineering construction; while the recyclable anchor cables and existing bamboo pole soil nails have disadvantages due to their own characteristics. Utility Model Content
[0007] The purpose of the utility model is to provide a bamboo pole body anchor rod to solve the problem that the existing conventional anchor cables are not easy to recycle, which not only causes resource waste and high carbon emissions, but also the anchor cables left in the soil will become obstacles to subsequent underground engineering construction; while the recyclable anchor cables and the existing bamboo pole body soil nails have technical problems caused by their own characteristics.
[0008] In order to solve the above technical problems, the utility model specifically provides a bamboo pole body anchor rod, the bamboo pole body anchor rod is made of a bamboo pole, and a bamboo node cavity is arranged at one end of the bamboo pole;
[0009] One end of the steel strand is fixedly connected to the bamboo joint cavity through a cementitious material, and the bamboo pole and the hole of the soil are also fixedly connected through a cementitious material.
[0010] As a preferred solution of the utility model, the inner wall of the bamboo joint cavity filled with cementitious material is provided with an isolation coating, which can prevent the bamboo pole from swelling due to water absorption or shrinking due to water loss, so that the solidified cementitious material is tightly bonded to the inner wall of the bamboo pole.
[0011] As a preferred solution of the utility model, an embossing head is provided at one end of the steel strand, and the embossing head is fixedly connected to the bamboo cavity through a gelling material.
[0012] As a preferred solution of the utility model, the steel strands can be replaced by prestressed steel bars, and the prestressed steel bars are fixedly connected to the bamboo cavity through a cementitious material.
[0013] As a preferred solution of the utility model, the inner and outer walls of the bamboo pole are both conical in shape as a whole, and the thicker root of the bamboo pole is arranged at the bottom of the hole, and the bamboo node cavity is arranged in the thinner tip end of the bamboo pole, so that the inner and outer sides of the bamboo pole can form a wedge effect to improve the bonding strength between the cementitious material and the inner wall of the bamboo pole, between the outer wall of the bamboo pole and the cementitious material, and between the cementitious material and the soil.
[0014] As a preferred solution of the utility model, a reinforcement ring is provided on the outer cover of the tip of the bamboo pole to improve the hoop load performance of the bamboo pole;
[0015] The gap between the reinforcement ring and the bamboo pole is filled with cementitious material to improve the stress.
[0016] As a preferred solution of the utility model, the reinforcement ring can be set as a steel pipe, the steel pipe is equal to the length of the bamboo cavity, and the two ends of the steel pipe are flush with the two end ends of the bamboo cavity.
[0017] As a preferred solution of the utility model, the cementitious material is cement paste, cement mortar, grouting material or synthetic resin.
[0018] As a preferred solution of the utility model, the bamboo pole is provided with a free section of a certain length near the outer side, and the bonding force between the free section of the bamboo pole and the cementitious material on the outer side is very small.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] The bamboo pole anchor adopts the design of steel strand combined with bamboo pole, with bamboo pole as the anchor rod body, a bamboo cavity is set at one end of the bamboo pole, and the steel strand for tensioning is fixed by cementitious material. The main material bamboo pole is renewable natural bamboo, which absorbs a large amount of carbon dioxide during the growth process of bamboo, and has good carbon benefits;
[0021] In addition, bamboo poles have poor shear resistance and can be easily destroyed by construction machinery. Even if they are left in the soil, they will not become obstacles. Moreover, bamboo poles will gradually degrade over time, so that even if they are not recycled, they will not affect the development and utilization of surrounding land.
[0022] The bamboo pole has high tensile strength. After anchoring the bamboo pole in the target soil, the steel strand is tensioned by a jack, and prestress is applied to the target soil in combination with the retaining members on the side of the target soil, thereby actively controlling soil deformation. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0024] Figure 1 It is a schematic structural diagram of the bamboo pole body anchor rod in the embodiment of the utility model.
[0025] The numbers in the figure represent the following:
[0026] 1-bamboo pole, 2-bamboo cavity, 3-steel strand, 4-cementitious material, 5-hole, 6-soil, 7-isolation coating, 8-embossed head, 9-steel pipe. DETAILED DESCRIPTION
[0027] 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 in 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.
[0028] The utility model specifically provides a bamboo pole body anchor rod, which is made of a bamboo pole 1, and one end of the bamboo pole 1 is provided with a bamboo node cavity 2;
[0029] One end of the steel strand 3 is fixedly connected to the bamboo joint cavity 2 via the cementitious material 4 , and the bamboo pole 1 and the hole 5 of the soil body 6 are also fixedly connected via the cementitious material 4 .
[0030] The bamboo pole body anchor adopts the design of steel strand 3 combined with bamboo pole 1, with bamboo pole 1 as the rod body of the anchor, a bamboo node cavity 2 is arranged at one end of the bamboo pole 1, and the steel strand 3 for tensioning is fixed by cementitious material 4.
[0031] That is, the utility model uses bamboo pole 1 as the main material of the anchor rod. The bamboo pole 1 is a renewable natural bamboo material. During the growth of the bamboo material, it absorbs a large amount of carbon dioxide. Its carbon emission factor is -1506kgCO2e / t, while the carbon emission factor of steel is 2340kgCO2e / t. According to the calculation of 10m anchor rod, the carbon emission of the bamboo anchor rod with 1.5m steel strand 3 is about -41kgCO2e, while the carbon emission of the steel anchor rod is about 23kgCO2e. The carbon reduction ratio of the bamboo anchor rod can reach 287.2%; it has good carbon benefits;
[0032] In addition, the shear resistance of the bamboo pole 1 is relatively poor, about 10 MPa, and construction machinery such as pile drivers and shield machines can easily destroy it. Even if it remains in the soil 6, it will not become an obstacle. The bamboo pole 1 will gradually degrade over time, achieving the effect of not affecting the land development and utilization of the surrounding soil 6 even if it is not recycled.
[0033] The bamboo pole 1 has high tensile strength. A pulling force is applied to the bamboo pole 1 through the steel strand 3, which transmits the pulling force to the retaining structures such as the waist beam and piles outside the soil body 6. The retaining structures then transmit the force to the soil body 6, thereby applying prestress to the target soil body 6 and actively controlling the deformation of the soil body 6.
[0034] It should be noted that the bamboo cavity 2 is made by removing bamboo partitions within a certain length range at one end of the bamboo pole 1. For example, after removing bamboo partitions within a range of 0.5m-1m, the space between the bamboo partitions closest to this end and the inner wall of the bamboo pole 1 is the bamboo cavity 2.
[0035] Furthermore, since bamboo is a material that easily absorbs water, its volume will expand after absorbing water and shrink after losing water. Considering that the cementitious material 4 in the utility model is mostly a slurry that easily exudes water, during the maintenance process, the inner wall of the bamboo pole 1 will first absorb water and expand, then lose water and shrink, and then partially separate from the solidified cementitious material 4, reducing the bonding strength between the cementitious material 4 and the inner wall of the bamboo pole 1.
[0036] In order to avoid the situation where the connection strength between the above-mentioned cementitious material 4 and the inner wall of the bamboo pole 1 is reduced, an isolation coating 7 is provided on the inner wall of the bamboo node cavity 2. The isolation coating 7 can isolate the inner wall of the bamboo pole 1 from the cementitious material 4, prevent the bamboo pole 1 from absorbing water and expanding or losing water and shrinking, so that the solidified cementitious material 4 is tightly bonded to the inner wall of the bamboo pole 1, thereby improving the bonding strength between the cementitious material 4 and the inner wall of the bamboo pole 1.
[0037] Furthermore, in order to improve the pull-out bearing capacity of the steel strand 3 , an embossing head 8 is provided at one end of the steel strand 3 , and the embossing head 8 is fixedly connected in the bamboo cavity 2 through the cementitious material 4 .
[0038] The embossing head 8 is produced by an embossing machine, and when there are a plurality of embossing heads 8, the embossing heads 8 need to be disposed in a staggered manner.
[0039] The embossed head 8 is a gripping structure, which will produce a wedge effect in the grouting body, forming a combined effect of the shear strength and compressive strength of the grouting body, changing the mechanical action mechanism of the ordinary anchor. Compared with the steel strand 3 without the embossed head 8 which only relies on the outer surface to bond with the grouting body, its pull-out bearing capacity can be significantly improved, thereby strengthening the connection strength between the steel strand 3 as a whole and the cementitious material 4, as well as the connection strength between the cementitious material 4 and the inner wall of the bamboo pole 1. In addition, it can also effectively reduce the usage of the steel strand 3 and the cementitious material 4.
[0040] In addition, the embossing head 8 can better apply a pulling force to the bamboo pole 1 and the cementitious material 4 at various locations, that is, it can better apply prestress to the target soil 6 and better play the role of actively controlling the deformation of the soil 6.
[0041] Furthermore, the steel strands 3 may be replaced by prestressed steel bars, which are fixedly connected to the bamboo cavity via a cementitious material 4 .
[0042] Furthermore, the inner and outer walls of the bamboo pole 1 are in a conical shape as a whole, that is, the root is thicker and the tip is thinner, which is also the natural shape of the bamboo pole 1.
[0043] The utility model makes full use of the natural shape of the bamboo pole 1, arranges the thicker root of the bamboo pole 1 at the bottom of the hole 5, and connects the steel strand 3 to the thinner tip end of the bamboo pole 1, so that the inner and outer sides of the bamboo pole 1 can form a wedge effect, further improving the connection strength between the cementitious material 4 and the inner wall of the bamboo pole 1, between the outer wall of the bamboo pole 1 and the cementitious material 4, and between the cementitious material 4 and the soil 6.
[0044] Furthermore, existing studies have also shown that the bamboo pole 1 has the characteristics of dense bamboo nodes at both ends and sparse bamboo nodes in the middle during its growth process. The existence of bamboo nodes will significantly improve the bonding performance between the outer wall of the bamboo pole 1 and the cementitious material 4. Therefore, the anchoring section of the utility model has the coupling effect of wedge effect and bamboo node gain, which can further enhance the connection strength between the outer wall of the bamboo pole 1 and the cementitious material 4 and the connection strength between the cementitious material 4 and the soil 6.
[0045] Furthermore, due to the obvious wedge effect between the steel strand 3 with the embossed head 8 and the inner wall of the bamboo pole 1, there will be a large circumferential tension in the cross section of the bamboo pole 1 in the combined section. Considering that the circumferential load performance of bamboo is poor, cracking is likely to occur when subjected to a large circumferential tension.
[0046] In order to prevent the bamboo pole 1 from cracking, a reinforcement ring is provided on the outer cover of the tip of the bamboo pole 1 , and a cementitious material 4 is filled in the gap between the reinforcement ring and the bamboo pole 1 to improve the circumferential load performance of the bamboo pole 1 .
[0047] Further, the reinforcement ring is set as a steel tube 9, the length of the steel tube 9 is equal to that of the bamboo cavity 2, and the two ends of the steel tube 9 are flush with the two ends of the bamboo cavity 2. For example, if the length of the bamboo cavity 2 is 0.5m, the length of the steel tube 9 is also cut to 0.5m.
[0048] Optionally, the reinforcement ring can also be set to glass fiber cloth, carbon fiber cloth or other fiber cloth that can apply prestress. The advantage is that a certain prestress can be applied when the cloth is wrapped, the bamboo tube has a stronger ability to control the circumferential deformation, and it will not become an obstacle affecting subsequent development and utilization when left in the soil 6.
[0049] Optionally, the cementitious material 4 is cement paste, cement mortar, grouting material or synthetic resin.
[0050] Specifically, the cementitious material 4 between the rod body and the soil is cement paste, cement mortar or grouting material; the cementitious material 4 between the rod body and the steel strand is cement paste, cement mortar, or other materials;
[0051] When fiber cloth is used to replace the steel pipe 9 and sleeved on one end, the gelling material 4 between the fiber cloth and the rod body is replaced with epoxy resin.
[0052] Furthermore, the bamboo pole 1 is provided with a free section of a certain length near the outer side, and the bonding force between the free section of the bamboo pole 1 and the cementitious material on the outer side is very small.
[0053] Firstly, injecting cementitious material with less adhesion to the outside of the bamboo pole in the free section helps to protect the bamboo pole from decaying too quickly; secondly, the setting of the free section can effectively reduce the loss of prestress during construction and use.
[0054] If there is no free section, the elastic elongation of the bamboo pole after tensioning and locking is small, and the prestress loss caused by factors such as deformation of the laying tool and shrinkage of the bamboo pole is large. At the same time, it is more sensitive to the displacement of the supporting structure. The tension in the bamboo pole will increase significantly with the displacement of the supporting structure. In severe cases, brittle failure will occur due to stress exceeding its strength.
[0055] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.
Claims
1. A bamboo pole anchor, characterized in that: The rod body of the bamboo rod body anchor rod is made of a bamboo rod (1), and one end of the bamboo rod (1) is provided with a bamboo node cavity (2); One end of the steel strand (3) is fixedly connected to the bamboo joint cavity (2) via a cementitious material (4), and the bamboo pole (1) and the hole (5) of the soil (6) are also fixedly connected via a cementitious material (4); The inner and outer walls of the bamboo pole (1) are both tapered as a whole, and the thicker root of the bamboo pole (1) is arranged at the bottom of the hole (5), and the bamboo node cavity (2) is arranged in the thinner tip end of the bamboo pole (1), so that the inner and outer sides of the bamboo pole (1) can form a wedge effect, thereby improving the bonding strength between the cementitious material (4) and the inner wall of the bamboo pole (1), between the outer wall of the bamboo pole (1) and the cementitious material (4), and between the cementitious material (4) and the soil (6).
2. A bamboo pole anchor rod according to claim 1, characterized in that: The inner wall of the bamboo joint cavity (2) is provided with an isolation coating (7) which can prevent the bamboo pole (1) from swelling due to water absorption or shrinking due to water loss, so that the solidified gelling material (4) is tightly bonded to the inner wall of the bamboo pole (1).
3. The bamboo pole anchor according to claim 1, characterized in that: The tip of the bamboo pole (1) is provided with a reinforcement ring to improve the hoop load performance of the bamboo pole (1); The gap between the reinforcement ring and the bamboo pole (1) is filled with a cementitious material (4) to improve the stress.
4. A bamboo pole anchor rod according to claim 3, characterized in that: The reinforcement ring can be set as a steel pipe (9), the steel pipe (9) is equal in length to the bamboo cavity (2), and the two ends of the steel pipe (9) are flush with the two end ends of the bamboo cavity (2).
5. The bamboo pole anchor rod according to claim 3, characterized in that: The cementitious material (4) is cement paste, cement mortar, grouting material or synthetic resin.