Foam filling retaining wall and construction method thereof

Abstract

The invention provides a foam filling retaining wall and a construction method thereof, and relates to the technical field of underground mine goaf filling. The foam filling retaining wall comprises two prefabricated foam layers which are arranged in a spaced mode, a bridge is arranged between the two prefabricated foam layers in a spanning mode, a reinforcing mesh is installed on the bridge, and filler of concrete and polyurethane foam is poured between the two prefabricated foam layers. Based on the technical scheme, the strength and the water filtering performance of the foam filling retaining wall can be improved, the construction efficiency of the filling retaining wall is improved, the construction cost of the filling retaining wall is reduced, and the construction safety of the filling retaining wall is improved.

Description

Technical Field

[0001] The invention relates to the technical field of filling underground mine goafs, and in particular to a foam-filled retaining wall and a construction method thereof. Background Art

[0002] Backfill retaining wall is a common engineering structure, which is often used in the backfilling operation of underground mine goaf. Before the backfilling operation, the backfill retaining wall should be constructed in the stable surrounding rock section of the goaf access road. The construction of the backfill retaining wall plays a vital role in whether the backfilling operation can be completed smoothly. The backfill retaining walls currently used in China can be mainly divided into the following types: gravity retaining wall, light retaining wall, and composite retaining wall of gravity retaining wall and light retaining wall. Gravity retaining wall can be further divided into hollow brick retaining wall, red brick retaining wall and concrete retaining wall, etc.; light retaining wall can be further divided into wooden retaining wall, wire rope retaining wall, etc.; composite retaining wall is a combination of gravity retaining wall and light retaining wall. Among them, concrete retaining wall and wooden retaining wall are the most commonly used.

[0003] Traditional retaining walls and construction methods have obvious disadvantages. For example, the bending strength of concrete retaining walls is relatively poor, which makes it easy for the retaining walls to move and deform when subjected to the lateral pressure of the filling slurry. Once the bearing capacity of the concrete retaining wall is exceeded, the retaining wall may collapse, causing the filling materials (such as tailings, etc.) to overflow, which will not only affect the filling effect, but also threaten the safety of the surrounding tunnels and workers. Therefore, in order to prevent the displacement and deformation of the retaining wall, the design of thickening the retaining wall is usually selected during the construction process, but this not only increases the amount of concrete used, but also increases the demand for auxiliary materials, thereby significantly increasing the cost of construction. In addition, thicker retaining walls may also reduce water filtration efficiency and affect the dehydration and curing process of the filling materials. During the construction process, in order to ensure the stability and strength of the retaining wall, complex formwork construction and steel bar fixing work are required, which are often time-consuming and labor-intensive, reducing construction efficiency and affecting the company's income. In addition, the large-scale use of concrete as a retaining wall material not only increases the mining and processing of raw materials, but the waste generated during the construction process may also burden the environment.

[0004] Although wooden retaining walls can provide a certain degree of support, their production and processing processes are complicated, and they require high quality wood, which increases costs. At the same time, wooden materials are prone to rot in the humid underground environment, which reduces the durability of the retaining wall. During the construction of wooden retaining walls, construction workers are required to perform a large amount of on-site operations, such as manually erecting wooden piles, which not only increases the workload of construction, but also places high demands on the physical strength and skills of construction workers. Whether it is a concrete retaining wall or a wooden retaining wall, there are certain safety risks during the construction process. Concrete retaining walls may have accidents during the pouring and curing process, while wooden retaining walls may collapse or cause injuries due to improper operation during the erection process.

[0005] Therefore, it is necessary to design a foam-filled retaining wall and a construction method thereof, which can improve the strength and water filtration performance of the filled retaining wall, improve the construction efficiency of the filled retaining wall, reduce the construction cost of the filled retaining wall, and improve the construction safety of the filled retaining wall. Summary of the invention

[0006] In response to the above-mentioned problems in the prior art, the present application proposes a foam-filled retaining wall and a construction method thereof, which can improve the strength and water filtration performance of the filled retaining wall, improve the construction efficiency of the filled retaining wall, reduce the construction cost of the filled retaining wall, and improve the construction safety of the filled retaining wall.

[0007] One aspect of the present invention provides a foam-filled retaining wall, which includes two prefabricated foam layers spaced apart, a bridge is arranged between the two prefabricated foam layers, a steel mesh is installed on the bridge, and concrete and polyurethane foam fillers are poured between the two prefabricated foam layers.

[0008] As a further improvement of the above technical solution:

[0009] The foam-filled retaining wall mentioned above, further, has positioning grooves on the bridge, and the steel bars of the steel mesh are positioned and placed in the positioning grooves.

[0010] The foam-filled retaining wall mentioned above, further, the prefabricated foam layer includes a plurality of prefabricated foam blocks, the edges of the prefabricated foam blocks are serrated, and two adjacent prefabricated foam blocks are spliced ​​through their serrated edges.

[0011] The above-mentioned foam-filled retaining wall further has water filtering holes formed on the prefabricated foam layer.

[0012] The above-mentioned foam-filled retaining wall further has an observation window installed on the prefabricated foam layer, and the observation window is used to observe the filling material.

[0013] The above-mentioned foam-filled retaining wall, further, the prefabricated foam layer is expanded polystyrene foam.

[0014] Another aspect of the present invention provides a method for constructing a foam-filled retaining wall, which is applied to the above-mentioned foam-filled retaining wall. The method for constructing a foam-filled retaining wall comprises the following steps:

[0015] Select the installation location of the retaining wall;

[0016] splicing a plurality of prefabricated foam blocks by their serrated edges to form two prefabricated foam layers spaced apart;

[0017] Insert the steel bars of the steel mesh into the positioning grooves of the bridge;

[0018] Infill of concrete and polyurethane foam is poured between two prefabricated foam layers.

[0019] As a further improvement of the above technical solution:

[0020] The above-mentioned method for constructing a foam-filled retaining wall further comprises the following steps:

[0021] Use a shaking stick to insert into the filling and expel the air from the filling through vibration.

[0022] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the present invention can be achieved.

[0023] The foam-filled retaining wall and its construction method provided by the present invention have at least the following beneficial effects compared with the prior art: when it is necessary to construct the foam-filled retaining wall, first select the installation position of the retaining wall, then install two prefabricated foam layers spaced apart, then insert the steel bars of the steel mesh into the positioning grooves of the bridge, and finally pour concrete and polyurethane foam fillers between the two prefabricated foam layers. In the foam-filled retaining wall, the prefabricated foam layer has a high shear strength due to its unique material properties, and the two prefabricated foam layers are connected by a bridge, which can effectively prevent the deformation and collapse of the retaining wall. The prefabricated foam layer is not only high in strength, but also has a good water permeability coefficient, which means that the filled retaining wall constructed with the prefabricated foam layer can better filter water and meet the requirements of filling dehydration, which is crucial to preventing the loss of filling materials and maintaining the stability of underground space.

[0024] The prefabricated foam layer can be pre-processed in the factory and then directly transported to the site for assembly. This construction method greatly simplifies the construction process, shortens the construction period, and improves construction efficiency. The modular design of the foam layer makes the construction more flexible and efficient. The construction personnel can quickly adjust the layout and combination of the modules according to the specific conditions of the site, so as to better adapt to different construction environments and needs.

[0025] The material cost of the foam layer is relatively low. For example, the price of the 250-type wall module is 70 yuan / square meter, and the 280-type is 75 yuan / square meter, which is lower than the cost of traditional filling retaining wall materials. This cost advantage not only reduces the initial investment, but also reduces the cost of subsequent maintenance. The durability and easy maintenance of the foam layer further reduce the overall operating costs. In addition, due to the high strength of the foam layer, there is no need to thicken the wall additionally, which further reduces the amount and cost of materials used. Due to the fast construction speed and short construction period of the foam layer, the corresponding construction cost will also be reduced. In addition, the modular design of the foam layer also reduces the complexity and uncertainty in the construction, further reducing the additional costs that may arise during the construction process.

[0026] The construction process of the foam layer is relatively simple, and the construction workers have low difficulty in operation, thus reducing the safety risks during the construction process. In addition, the lightweight characteristics of the foam layer also make it easier to carry and install during the construction process, reducing the labor intensity of workers. The foam layer is made of flame-retardant materials, and its fireproof performance is further improved after the main structure is assembled. This is of great significance in preventing underground combustion accidents and ensuring the safety of construction workers and mining.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0030] Figure 1 A schematic diagram showing the structure of a foam-filled retaining wall provided by an embodiment of the present invention is shown;

[0031] Figure 2 A schematic diagram showing the structure of a prefabricated foam layer of a foam-filled retaining wall provided by an embodiment of the present invention;

[0032] Figure 3 A schematic diagram showing the structure of a reinforcement mesh of a foam-filled retaining wall provided by an embodiment of the present invention;

[0033] Figure 4 A schematic diagram showing the structure of a prefabricated foam block of a foam-filled retaining wall provided by an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the assembly structure of prefabricated foam blocks of a foam-filled retaining wall provided by an embodiment of the present invention is shown.

[0035] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0036] Description of reference numerals:

[0037] 100 - foam-filled retaining wall, 110 - prefabricated foam layer, 111 - prefabricated foam block, 112 - water filter hole, 113 - observation window, 120 - bridge, 121 - positioning groove, 130 - steel mesh, 140 - filler. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] The embodiment of the present invention provides a foam-filled retaining wall 100, which can improve the strength and water filtration performance of the filled retaining wall, enhance the construction efficiency of the filled retaining wall, reduce the construction cost of the filled retaining wall, and improve the construction safety of the filled retaining wall.

[0045] See also Figure 1 , Figure 3 and Figure 4 The foam-filled retaining wall 100 provided in an embodiment of the present invention includes two prefabricated foam layers 110 spaced apart, a bridge 120 is arranged between the two prefabricated foam layers 110, a steel mesh 130 is installed on the bridge 120, and a filler 140 of concrete and polyurethane foam is poured between the two prefabricated foam layers 110.

[0046] When the foam-filled retaining wall 100 needs to be constructed, the installation position of the retaining wall is first selected, and then two layers of prefabricated foam layers 110 are installed at intervals, and then the steel bars of the steel mesh 130 are inserted into the positioning grooves 121 of the bridge 120, and finally concrete and polyurethane foam filler 140 are poured between the two prefabricated foam layers 110.

[0047] In the foam-filled retaining wall 100, the traditional filling retaining wall has poor shear strength due to the limitations of materials and structures, which can easily lead to local bending deformation and even collapse and sand leakage. In this case, the filling slurry may enter the adjacent tunnels or working surfaces, seriously affecting the normal production of the mine. The prefabricated foam layer 110 has a higher shear strength due to its unique material properties, and the two layers of prefabricated foam layers 110 are connected by a bridge 120, which can effectively prevent the deformation and collapse of the retaining wall. The prefabricated foam layer 110 is not only high in strength, but also has a good permeability coefficient, which means that the filling retaining wall constructed by the prefabricated foam layer 110 can better filter water and meet the requirements of filling dehydration, which is crucial to preventing the loss of filling materials and maintaining the stability of the underground space.

[0048] The traditional filling retaining wall construction process is complicated and requires a lot of manpower and time. In contrast, the prefabricated foam layer 110 can be pre-processed in the factory and then directly transported to the site for assembly. This construction method greatly simplifies the construction process, shortens the construction period, and improves construction efficiency. The modular design of the foam layer makes the construction more flexible and efficient. The construction personnel can quickly adjust the layout and combination of the modules according to the specific conditions of the site, so as to better adapt to different construction environments and needs.

[0049] The material cost of the foam layer is relatively low. For example, the price of the 250-type wall module is 70 yuan / square meter, and the 280-type is 75 yuan / square meter, which is lower than the cost of traditional filling retaining wall materials. This cost advantage not only reduces the initial investment, but also reduces the cost of subsequent maintenance. The durability and easy maintenance of the foam layer further reduce the overall operating costs. In addition, due to the high strength of the foam layer, there is no need to thicken the wall additionally, which further reduces the amount and cost of materials used. Due to the fast construction speed and short construction period of the foam layer, the corresponding construction cost will also be reduced. In addition, the modular design of the foam layer also reduces the complexity and uncertainty in the construction, further reducing the additional costs that may arise during the construction process.

[0050] The construction process of the foam layer is relatively simple, and the construction workers have low difficulty in operation, thus reducing the safety risks during the construction process. In addition, the lightweight characteristics of the foam layer also make it easier to carry and install during the construction process, reducing the labor intensity of workers. The foam layer is made of flame-retardant materials, and its fireproof performance is further improved after the main structure is assembled. This is of great significance in preventing underground combustion accidents and ensuring the safety of construction workers and mining.

[0051] For details of the foam-filled retaining wall 100 provided in the embodiment of the present invention, please refer to Figure 3 and Figure 4The bridge 120 is provided with a positioning groove 121, and the steel bars of the steel mesh 130 are positioned and placed in the positioning groove 121. In this embodiment, the prefabricated foam layer 110 is a double-sided design, and two rows of high-density bridges 120 are installed inside. In addition to reinforcing the connection between the prefabricated foam layers 110, another function is to fix the steel bars (anchor rods). After all the prefabricated foam layers 110 are overlapped, the steel bars (anchor rods) are filled horizontally and vertically along the positioning grooves 121 on the bridge 120. The positioning grooves 121 position the steel bars of the steel mesh 130, so that the steel bars of the steel mesh 130 are evenly distributed, thereby improving the overall strength of the foam-filled retaining wall 100 provided by the embodiment of the present invention.

[0052] In this embodiment, please combine Figure 2 and Figure 5 The prefabricated foam layer 110 includes a plurality of prefabricated foam blocks 111, the edges of the prefabricated foam blocks 111 are serrated, and two adjacent prefabricated foam blocks 111 are spliced ​​by their serrated edges. The prefabricated foam blocks 111 manufactured in a factory modular manner are prefabricated in standard sizes according to design requirements, ensuring the consistency and reliability of product quality. The modular design also allows for quick assembly and disassembly, improving the flexibility of construction. The serrated groove design on the edge of each prefabricated foam block 111 enables the prefabricated foam blocks 111 to be tightly spliced ​​to form a stable structure. This connection method not only simplifies the construction process, but also enhances the overall stability of the retaining wall. If the construction site requires prefabricated foam blocks 111 of special sizes, workers can use simple tools, such as a knife, to quickly cut the foam to meet the needs of different sizes. This flexibility significantly improves the adaptability and efficiency of construction.

[0053] The foam-filled retaining wall 100 provided in the embodiment of the present invention may further be combined with Figure 1 and Figure 2 The prefabricated foam layer 110 is provided with a water filter hole 112, which further improves the water filterability of the foam-filled retaining wall 100. The prefabricated foam layer 110 is provided with an observation window 113, which is used to observe the filler 140. The prefabricated foam layer 110 is expanded polystyrene foam. Other materials can also be selected to make the prefabricated foam layer 110 during the design process, for example, graphene can be selected as the raw material.

[0054] Expanded polystyrene is a lightweight material, but its mechanical strength is relatively low. Graphene is known for its excellent mechanical properties, with extremely high Young's modulus and tensile strength, and is one of the strongest materials known. Expanded polystyrene itself does not have fireproof capabilities, and usually requires the addition of flame retardants to improve its fireproof performance, which is usually Class B. The application of graphene in fire-retardant coatings can improve the fireproof performance of coatings. Studies have shown that the addition of graphene can significantly enhance the fire resistance and thermal stability of fire-retardant coatings. At the same time, graphene can also be used in anti-static materials, such as graphene nano-all-anti-static workbenches, which are made using graphene nanotechnology and have anti-static properties. As a plastic foam material, expanded polystyrene has a relatively low cost and is affordable. As a new high-performance material, graphene has a high production cost and is relatively expensive.

[0055] The construction method of the foam-filled retaining wall 100 according to the embodiment of the present invention is applied to the foam-filled retaining wall 100 provided in the above embodiment. The construction method of the foam-filled retaining wall 100 comprises the following steps:

[0056] S10: Select the installation location of the retaining wall.

[0057] S20: splicing a plurality of prefabricated foam blocks 111 through their serrated edges to form two prefabricated foam layers 110 that are spaced apart.

[0058] The prefabricated foam blocks 111 are modularly manufactured in the factory and pre-manufactured in standard sizes according to design requirements, ensuring the consistency and reliability of product quality. The modular design also allows for quick assembly and disassembly, improving construction flexibility. The serrated groove design on the edge of each prefabricated foam block 111 allows the prefabricated foam blocks 111 to be tightly plugged together to form a stable structure. This connection method not only simplifies the construction process, but also enhances the overall stability of the retaining wall. If the construction site requires prefabricated foam blocks 111 of special sizes, workers can use simple tools, such as a knife, to quickly cut the foam to meet the needs of different sizes. This flexibility significantly improves the adaptability and efficiency of construction.

[0059] S30 : inserting the steel bars of the steel mesh 130 into the positioning grooves 121 of the bridge 120 .

[0060] The workers insert steel bars along the positioning grooves 121 on the bridge 120 . These steel bars play a locking role during the filling process of concrete and polyurethane foam filler 140 , preventing the concrete from shifting during the curing process.

[0061] S40 : pouring a filler 140 of concrete and polyurethane foam between two prefabricated foam layers 110 .

[0062] The combined use of concrete and polyurethane foam not only provides the necessary structural strength of the filler 140, but also utilizes the light weight and good thermal insulation performance of polyurethane foam to improve the thermal insulation and energy saving effect of the retaining wall. The use of polyurethane foam as a filling material not only reduces the weight of the structure, but also has good environmental adaptability, reduces the consumption of natural resources and the generation of waste during the construction process.

[0063] The method for constructing the foam-filled retaining wall 100 of the embodiment of the present invention further includes the following steps:

[0064] S50: insert a shaking stick into the filler 140 to expel the air in the filler 140 through vibration.

[0065] After completing the filling operation of concrete and polyurethane foam filler 140, workers need to use shaking sticks to continuously insert into the foam concrete to expel the air in the concrete through vibration. After the foam concrete is solidified and formed, the foam-filled retaining wall 100 is completed.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0067] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A foam-filled retaining wall, characterized in that: The foam-filled retaining wall (100) comprises two prefabricated foam layers (110) arranged at an interval, a bridge (120) is arranged between the two prefabricated foam layers (110), a steel mesh (130) is installed on the bridge (120), and a filler (140) of concrete and polyurethane foam is poured between the two prefabricated foam layers (110).

2. The foam-filled retaining wall according to claim 1, characterized in that: The bridge (120) is provided with a positioning groove (121), and the steel bars of the steel mesh (130) are positioned and placed in the positioning groove (121).

3. The foam-filled retaining wall according to claim 1, characterized in that: The prefabricated foam layer (110) comprises a plurality of prefabricated foam blocks (111), the edges of the prefabricated foam blocks (111) are serrated, and two adjacent prefabricated foam blocks (111) are spliced ​​via their serrated edges.

4. The foam-filled retaining wall according to claim 1, characterized in that: The prefabricated foam layer (110) is provided with water filtering holes (112).

5. The foam-filled retaining wall according to claim 1, characterized in that: An observation window (113) is installed on the prefabricated foam layer (110), and the observation window (113) is used to observe the filler (140).

6. The foam-filled retaining wall according to claim 1, characterized in that: The prefabricated foam layer (110) is expanded polystyrene foam.

7. A method for constructing a foam-filled retaining wall, characterized in that: Applied to the foam-filled retaining wall (100) described in the above claim, the method for constructing the foam-filled retaining wall comprises the steps of: Select the installation location of the retaining wall; splicing a plurality of prefabricated foam blocks (111) through their serrated edges to form two prefabricated foam layers (110) disposed at intervals; Inserting steel bars of a steel mesh (130) into the positioning grooves (121) of the bridge (120); A filler (140) of concrete and polyurethane foam is poured between the two prefabricated foam layers (110).

8. The method for constructing a foam-filled retaining wall according to claim 7, characterized in that: The method for constructing the foam-filled retaining wall further comprises the steps of: A shaking stick is inserted into the filler (140) to expel the air in the filler (140) through vibration.

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