Premixed flow state solidified soil backfilling method

Abstract

The invention provides a premixed flow state solidified soil backfilling method. The method comprises the steps that a first layer of formworks and first soil bags laterally supporting the first layer of formworks are arranged at the open ends of a foundation pit to be backfilled correspondingly; pre-mixed flow state solidified soil is poured into the foundation pit under the supporting action of the first layer of formwork and the first soil bag, and a first backfill layer is formed; after the first backfill layer is finally set, a second layer of formwork and a second soil bag laterally supporting the second layer of formwork are arranged on the first backfill layer; pre-mixed flow state solidified soil is poured on the first backfill layer under the supporting action of the second layer of formwork and the second soil bag, and a second backfill layer is formed; and the layered pouring process of the backfill layer is circulated till the foundation pit is completely backfilled. The backfilling construction difficulty of the foundation pit fat groove part can be reduced, the construction speed is increased, and the construction quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and more specifically to a premixed fluidized solidified soil backfilling method. Background Art

[0002] At present, the number of deep foundation pit support projects for residential buildings, underground integrated pipeline corridors and other structures is increasing. Due to the loose backfill soil, sinking and damage to the surrounding areas of buildings, roads above the integrated pipeline corridors and other parts often occur. In serious cases, it will lead to quality accidents and affect the normal use of functions.

[0003] In order to avoid subsidence caused by loose backfill soil, traditional processes mostly use plain soil or gray soil to backfill in layers, and use small compaction equipment to carry out layered rolling. Not only is the backfilling period long and the construction difficult, but the backfilling quality is also difficult to guarantee. In addition, to ensure the backfilling quality, low-grade plain concrete can also be used to backfill the foundation pit, but this method has a high engineering cost, and the concrete strength is relatively high, making it difficult to repair and maintain complex parts of underground pipelines in the later stage. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a premixed fluidized solidified soil backfilling method to solve the problems that the existing construction cannot guarantee the backfilling quality, has a long backfilling cycle, and is difficult to construct.

[0005] The premixed fluidized solidified soil backfilling method provided by the present invention comprises providing a first layer of formwork and a first sandbag for laterally supporting the first layer of formwork at each open end of the foundation pit to be backfilled;

[0006] Under the support of the first layer of formwork and the first sandbags, pouring premixed fluidized solidified soil into the foundation pit to form a first backfill layer;

[0007] After the first backfill layer is finally set, a second layer of formwork and a second sandbag for laterally supporting the second layer of formwork are arranged on the first backfill layer;

[0008] Under the support of the second layer of formwork and the second sandbags, pouring premixed fluidized solidified soil on the first backfill layer to form a second backfill layer;

[0009] The layered pouring process of the backfill layer is repeated until the foundation pit is completely backfilled.

[0010] In addition, an optional technical solution is that the arrangement shape of the first sandbags and the second sandbags is adapted to the cross-sectional shape of the corresponding position of the foundation pit.

[0011] In addition, an optional technical solution is that the height range of the first backfill layer and the second backfill layer is 2m to 3m respectively;

[0012] In addition, an optional technical solution is that the first backfill layer and the second backfill layer each include at least one backfill section, and each backfill section is independently backfilled.

[0013] In addition, an optional technical solution is that the first sandbags and the second sandbags are distributed in a shape that is narrow at the top and wide at the bottom along the height direction.

[0014] In addition, an optional technical solution is that the side surfaces of the first sandbag / the second sandbag are distributed in a triangular shape, and the side slope foot angle of the first sandbag / the second sandbag is in the range of 45° to 60°.

[0015] In addition, an optional technical solution is that after the first backfill layer is finally set, the method further comprises:

[0016] Removing the first sandbags and the first layer of formwork;

[0017] The second layer of formwork adopts the first layer of formwork after being dismantled, and the second sandbags adopt the first sandbags after being dismantled.

[0018] In addition, an optional technical solution is that the first layer of formwork includes a supporting steel pipe fixed by welding and a panel arranged on the supporting steel pipe.

[0019] In addition, an optional technical solution is that the height of the first layer of template is greater than the height of the first backfill layer; and the height of the second layer of template is greater than the height of the second backfill layer.

[0020] In addition, an optional technical solution is that when the bottom elevations of the foundation pits are inconsistent, backfilling is performed in the order of deep first and shallow later.

[0021] Utilizing the above-mentioned premixed fluidized solidified soil backfilling method, a first layer of formwork and a first sandbag for laterally supporting the first layer of formwork are respectively arranged at each open end of the foundation pit to be backfilled, the first layer of formwork is laterally supported by the first sandbag, and then premixed fluidized solidified soil is poured into the foundation pit to form a first backfill layer. After the first backfill layer is finally set, a second layer of formwork and a second sandbag for laterally supporting the second layer of formwork are arranged on the basis of the first backfill layer. Similarly, premixed fluidized solidified soil is poured on the first backfill layer to form a second backfill layer, and the layered pouring process of the above-mentioned backfill layers is repeated until the foundation pit is completely backfilled. The stacking method of the sandbags can be arbitrarily changed with the shape of the foundation pit, and is suitable for various foundation pit sections, especially the construction of irregular parts. It has flexible arrangement and strong applicability, and the sandbags can be filled in advance, thereby speeding up the construction speed and improving the construction quality.

[0022] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0024] Figure 1 Flow chart of a premixed fluidized solidified soil backfilling method according to an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of a premixed fluidized solidified soil backfilling method according to an embodiment of the present invention;

[0026] Figure 3 is a cross-sectional view of a foundation pit according to an embodiment of the present invention;

[0027] Figure 4 It is a partial enlarged view of the foundation pit cross section according to an embodiment of the present invention.

[0028] The accompanying drawings are marked with the following: formwork 1, first layer formwork 11, second layer formwork 12, third layer formwork 13, supporting steel pipe 2, first sandbag 31, second sandbag 32, third sandbag 33, sandbag 34, premixed fluidized solidified soil 4, underground structure side wall 5, top surface 51 of underground structure side wall, underground structure 6, foundation pit support structure 7.

[0029] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0030] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is apparent that these embodiments may also be implemented without these specific details. In other examples, for ease of describing one or more embodiments, known structures and devices are shown in the form of block diagrams.

[0031] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, 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.

[0032] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that the term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0034] In order to describe the premixed fluidized solidified soil backfilling method in the present invention in detail, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Figure 1 The schematic flow chart of the premixed fluidized solidified soil backfilling method according to an embodiment of the present invention is shown; Figures 2 to 4 The schematic structure of the principle of the premixed fluidized solidified soil backfilling method according to an embodiment of the present invention is shown from different angles.

[0036] like Figures 1 to 4 As shown together, the premixed fluidized solidified soil backfilling method of the embodiment of the present invention at least comprises the following steps:

[0037] S100: A first layer of formwork and a first sandbag for laterally supporting the first layer of formwork are respectively arranged at each open end of the foundation pit to be backfilled.

[0038] S200: Under the support of the first layer of formwork and the first sandbag, pour premixed fluidized solidified soil into the foundation pit to form the first backfill layer.

[0039] S300: After the first backfill layer is finally set, a second layer of formwork and a second sandbag for laterally supporting the second layer of formwork are arranged on the first backfill layer.

[0040] S400: With the support of the second layer of formwork and the second sandbag, pour the premixed fluidized solidified soil on the first backfill layer to form the second backfill layer.

[0041] S500: The above-mentioned layered pouring process of the backfill layer is repeated until the foundation pit is completely backfilled.

[0042] Among them, the arrangement shapes of the first sandbag, the second sandbag and the layers of sandbags arranged in sequence thereon can be set to adapt to the cross-sectional shape of the corresponding position of the foundation pit. In particular, when the cross-sectional shape of the foundation pit is irregular or special, the sandbags at the corresponding positions can be flexibly arranged. For the case where the cross-sectional shape of the foundation pit is regular, the sandbags 34 can be directly used to provide a supporting retaining wall to achieve effective positioning of the casting formwork 1.

[0043] For example, there are regular and irregular foundation pit side walls around the underground structure 6. During the layered and segmented pouring construction process, when the foundation pit side wall between the underground structure side wall 5 and the foundation pit support structure 7 (the left side of the underground structure 6) is a regular shape, the formwork can be directly supported and limited by sandbags 34, and then the premixed fluidized solidified soil can be poured in layers. For the irregular side walls of the foundation pit (the right side of the underground structure 6), inverted trapezoidal and triangular sandbags in side view can be used for filling support, and then the premixed fluidized solidified soil can be poured layer by layer.

[0044] Specifically, the premixed fluidized solidified soil 4 can be poured in sections and layers, and the pouring operation of the previous backfill layer is carried out after the final setting of the next backfill layer. The height of each backfill layer in the layered backfill can be controlled within 2 to 3 meters. The position shown by the layered pouring height line in the attached figure can be referred to, and the construction progress can be accelerated under the condition of pouring quality. Among them, the end of each section or layer of the foundation pit can be blocked by stacking sandbags and templates 1. For the irregular fertilizer trough section of the foundation pit, the seams can be plugged in advance with sandbags. After the sandbags are formed by filling woven bags with sand, they are stacked into a triangular cross-section retaining wall as the back support structure of the template 1.

[0045] In a specific embodiment of the present invention, each backfill layer such as the first backfill layer and the second backfill layer may respectively include at least one backfill section, and each backfill section is independently backfilled. The combination of the above-mentioned sandbags and the template 1 can be applied to the construction process of each layer or each backfill section in each layer. When the elevation of the bottom of the foundation pit is inconsistent, backfilling is carried out in the order of deep first and shallow later.

[0046] In order to improve the supporting strength of the sandbags, the first sandbag 31, the second sandbag 32, the third sandbag 33 and the sandbags arranged in sequence thereon can be distributed in a three-dimensional shape along the height direction, which is narrow at the top and wide at the bottom. The side surfaces are distributed in a triangular shape, with reasonable force and a stable and reliable structure, which can prevent the formwork 1 from being displaced by impact and causing leakage of the premixed fluidized solidified soil 4.

[0047] As a specific example, the sides of the first sandbag / second sandbag are distributed in a triangular shape to form a retaining wall structure supporting the formwork 1, and the side slope foot angle of the first sandbag / second sandbag is in the range of 45° to 60°, which can be flexibly set according to the size of the foundation pit section. If the foundation pit section is large and the force is large during the pouring process, the slope foot angle can be set to 45 degrees, otherwise a 60-degree angle can be used to ensure the stability of the supported and limited formwork 1. During the construction of each layer, the stacking height of the sandbags can be set according to the height of the corresponding backfill layer, which is generally 2-3m.

[0048] In addition, the above-mentioned first layer formwork 11, second layer formwork 12, third layer formwork 13 and other formwork structures can be spliced ​​into an integral structure using waste formwork to prevent leakage of slurry during the construction of the premixed fluidized solidified soil 4. At the same time, the premixed fluidized solidified soil 4 and sandbags can be isolated by the formwork, and the reuse of sandbags can be guaranteed.

[0049] Among them, the formwork 1 (including the first layer formwork 11, the second layer formwork 12, the third layer formwork 13, etc.) further includes a welded and fixed supporting steel pipe 2 and a formwork panel arranged on the supporting steel pipe 2, wherein the supporting steel pipe 2 is located on the soil facing side, and the panel is located on the sandbag side. The formwork is temporarily fixed by the supporting steel pipe 2 to prevent the formwork from being displaced by impact and causing slurry leakage. It can be seen that the height of the formwork of each layer needs to be greater than the height of the corresponding backfill layer to ensure the pouring quality. For example, the height of the first layer formwork 11 needs to be greater than the height of the first backfill layer, and the height of the second layer formwork needs to be greater than the height of the second backfill layer, and so on.

[0050] In another specific embodiment of the present invention, after the first backfill layer is finally set, it also includes: removing the first sandbag 31 and the first layer of formwork 11; the second layer of formwork 12 adopts the removed first layer of formwork 11, and the second sandbag 32 adopts the removed first sandbag 31. In this way, the construction of each backfill layer can be completed through a set of sandbags and formwork structures, which can reduce construction costs.

[0051] Among them, after the lower layer of premixed fluidized solidified soil is finally set (generally 12 hours), the lower sandbags and formwork can be moved to the poured solidified soil layer, and the lower layer of premixed fluidized solidified soil can continue to be poured. The overall distribution is stepped, which meets the construction specifications and reasonable force.

[0052] It can be seen that the brick retaining walls used in traditional construction sites require leveling of the foundation first, and the wall is built in layers. After the wall is built, it needs to be maintained, and solidified soil backfill construction can be carried out only when it reaches a certain strength. When the foundation pit is deep and the wall is high, additional wall buttresses are required. The construction process is complicated, the construction speed is slow, the materials are used once and cannot be circulated, and the cost is high.

[0053] According to the premixed fluidized solidified soil backfilling method of the present invention, there are few processes, simple operation, sandbags can be loaded in advance, and the construction speed is fast; the stacking method of sandbags can be changed at will with the shape of the foundation pit, which is suitable for various foundation pit sections, especially the construction of irregular parts, with flexible layout and strong applicability; the sandbags are narrow at the top and wide at the bottom in the height direction, arranged in a triangular shape, with reasonable force and a stable and reliable structure. Steel pipes are used for temporary support to ensure that the template is stable during the construction of the premixed fluidized solidified soil, and it will not be displaced by impact and cause leakage. The materials used are locally sourced and can be recycled after the construction of each step is completed. The project cost is low, and the construction technology is more standardized and reasonable, which can meet the needs of various types of construction.

[0054] The premixed fluidized solidified soil backfilling method according to the present invention is described as an example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various improvements can be made to the premixed fluidized solidified soil backfilling method proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A method for backfilling premixed fluidized solidified soil, characterized in that: include: A first layer of formwork and a first sandbag for laterally supporting the first layer of formwork are respectively arranged at each open end of the foundation pit to be backfilled; Under the support of the first layer of formwork and the first sandbags, pouring premixed fluidized solidified soil into the foundation pit to form a first backfill layer; After the first backfill layer is finally set, a second layer of formwork and a second sandbag for laterally supporting the second layer of formwork are arranged on the first backfill layer; Under the support of the second layer of formwork and the second sandbags, pouring premixed fluidized solidified soil on the first backfill layer to form a second backfill layer; The layered pouring process of the backfill layer is repeated until the foundation pit is completely backfilled.

2. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: The arrangement shape of the first sandbags and the second sandbags is adapted to the cross-sectional shape of the corresponding position of the foundation pit.

3. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: The height ranges of the first backfill layer and the second backfill layer are 2m to 3m respectively.

4. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: The first backfill layer and the second backfill layer each include at least one backfill section, and each backfill section is independently backfilled.

5. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: The first sandbags and the second sandbags are distributed in a shape of being narrow at the top and wide at the bottom along the height direction.

6. The method for backfilling premixed fluidized solidified soil according to claim 5, characterized in that: The side surfaces of the first sandbag / the second sandbag are distributed in a triangular shape, and the side slope foot angles of the first sandbag / the second sandbag are in the range of 45° to 60°.

7. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: After the first backfill layer is finally set, the method further includes: Removing the first sandbags and the first layer of formwork; The second layer of formwork adopts the first layer of formwork after being dismantled, and the second sandbags adopt the first sandbags after being dismantled.

8. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: The first layer of formwork includes a supporting steel pipe fixed by welding and a panel arranged on the supporting steel pipe.

9. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: The height of the first layer of template is greater than the height of the first backfill layer; The height of the second layer of template is greater than the height of the second backfill layer.

10. The method for backfilling premixed fluidized solidified soil according to claim 1, characterized in that: When the bottom elevations of the foundation pits are inconsistent, backfilling is performed in the order of deep first and shallow later.

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