Construction method of solidified soil in limited space

Abstract

The invention relates to a construction method for solidified soil in a limited space, and aims to improve the construction efficiency and quality, reduce the cost and reduce the environmental influence. The method comprises the steps that the side wall of a foundation pit is pretreated, an excavation area is divided into an upper half area and a lower half area and further divided into a plurality of rectangular subareas, and diagonal jump excavation type excavation is adopted; the waste soil is put into the previous excavation area, and macromolecule flow state solidified soil site stirring equipment is installed; adding a prefabricated polymer solution according to the amount of waste soil for mixing, and directly pouring to an excavation area; the excavator moves to the next excavation area, and meanwhile the replacement filling work of the previous excavation area is completed; and water spraying and film covering maintenance are conducted on the excavation area subjected to replacement and filling. According to the method, by optimizing the excavation sequence and preparing the macromolecule solidified soil on site, efficient waste soil solidification and replacement filling are achieved, and safety and stability of the foundation pit are guaranteed.

Description

Technical Field

[0001] The invention relates to the field of foundation pit construction, and in particular to a construction method for solidifying soil in a limited space. Background Art

[0002] In the field of civil engineering, especially in urban construction and infrastructure construction, we often encounter construction situations that require soil solidification and replacement in limited space. Traditional soil solidification methods have many limitations, such as low construction efficiency, high cost, and great impact on the surrounding environment. Especially in foundation pit projects, due to space limitations and considerations for the stability of surrounding buildings, traditional soil solidification methods often fail to meet construction requirements.

[0003] In the prior art, the pretreatment of the sidewalls of the foundation pit and the excavation of the replacement area usually adopt a layer-by-layer excavation method. This method is not only inefficient, but also has a large disturbance to the soil layer, which can easily lead to the instability of the sidewalls of the foundation pit and increase the construction risk. In addition, the traditional solidified soil construction method often requires the waste soil to be transported to a place far away from the construction site for solidification treatment, and then the solidified soil is transported back to the construction site for replacement. This process not only increases the transportation cost, but also prolongs the construction period.

[0004] In response to the above problems, although there have been some improvement measures, such as using polymer materials as curing agents to improve the quality of solidified soil, these methods often require the preparation of polymer solutions at the construction site, which not only has high requirements on site conditions, but also has low preparation efficiency and is difficult to meet the needs of large-scale construction. Summary of the invention

[0005] Therefore, it is necessary to develop a new construction method for consolidating soil in a limited space, which can improve construction efficiency, reduce construction costs, and reduce the impact on the surrounding environment while ensuring construction safety and quality. The present invention is based on such a demand and proposes a construction method for consolidating soil in a limited space. To achieve the above goals, the present invention adopts the following technical solutions:

[0006] A construction method for consolidating soil in a limited space comprises the following construction steps:

[0007] S1: Pre-treat the side wall of the foundation pit;

[0008] S2: Divide the replacement area into excavation areas, specifically into upper and lower half areas, and the upper and lower half areas are respectively divided into multiple rectangular partitions, all rectangular partitions have the same size, and diagonal jump excavation is adopted;

[0009] S3: placing the waste soil in the current excavation area into the previous excavation area, and installing a polymer fluidized solidified soil on-site mixing device in the previous excavation area;

[0010] S4: according to the amount of waste soil, a corresponding number of prefabricated polymer solutions are added to mix the polymer fluidized solidified soil, and the mixed polymer fluidized solidified soil is directly poured into the excavation area;

[0011] S5: After the waste soil in the current excavation area is excavated, the excavator moves to the next excavation area according to the diagonal jump excavation, and the polymer fluidized solidified soil replacement work is completed in the previous excavation area at the same time;

[0012] S6: After the polymer fluidized solidified soil on-site mixing equipment is hoisted to the next excavated area, the excavated area that has been replaced is maintained by watering and covering;

[0013] S7: Repeat S3-S6 until all excavated areas are replaced.

[0014] Furthermore, in S2, the replacement area is divided into excavation areas by numbering the first row of excavation areas from left to right as W1, W2, W3, W4, and W5, and the second row of excavation areas are numbered from left to right as W6, W7, W8, W9, and W10. The diagonal skip excavation includes two routes, the first route is W1-W7-W3-W9-W5, and the second route is W6-W2-W8-W4-W10.

[0015] Furthermore, in S3, the waste soil in the excavation area W1 is placed in an open space for standby use. When the excavation of the excavation area W10 is completed, the waste soil in the excavation area W1 is placed in the excavation area W10 for mixing with polymer fluidized solidified soil and replacement filling.

[0016] Furthermore, in S3, the waste soil in the excavation area W7 is placed in the excavation area W1, and a polymer fluidized solidified soil on-site mixing device is installed in the excavation area W1.

[0017] Furthermore, in S4, a prefabricated polymer solution is also included:

[0018] S41: Selecting the polymer material as one of polyacrylamide, sulfonated oil, modified water glass, epoxy resin or a combination thereof;

[0019] S42: mixing the selected polymer material with deionized water according to a proportion, stirring to dissolve, stirring at a speed of 100 rpm for 120 minutes;

[0020] S43: dihydroxymethylbutyric acid, carboxymethyl cellulose, xanthan gum, and lignin sulfonate are mixed and dissolved with deionized water respectively;

[0021] S44: mixing and stirring the dissolved polymer material solution and other component solutions; adding various polymer solutions into the container in turn and mixing and stirring at room temperature;

[0022] S45: After mixing and stirring, fermentation is carried out, and the all-purpose bacteria king is added to ferment at 25°C for 7 days, and a curing agent is prepared, which is then sealed and stored.

[0023] The construction method of consolidating soil in a limited space of the present invention has the following significant beneficial effects:

[0024] (1) By setting up diagonal skip excavation, the impact of the entire excavation and replacement construction on the soil layer is minimized, ensuring the safety and stability of the entire foundation pit, reducing the impact of the foundation pit on nearby building foundations, and achieving high-quality limited space replacement construction;

[0025] (2) By directly hoisting the polymer fluidized solidified soil on-site mixing equipment to the replacement area for waste soil solidification and replacement, on the one hand, the cost of waste soil transportation is reduced, and on the other hand, replacement and excavation can be carried out simultaneously, greatly improving the construction efficiency of waste soil solidification;

[0026] (3) By mixing polymer materials with deionized water to reinforce the soil through ion exchange principle or material polymerization, the quality of the solidified soil is greatly improved;

[0027] (4) The polymer solution is prefabricated, which greatly improves the efficiency of on-site construction and avoids the problem of being unable to provide superior preparation conditions on site, thereby reducing the effect of the curing agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic diagram of the replacement and filling area of ​​the present invention.

[0030] Figure 2 It is a construction schematic diagram of step S3 of the present invention.

[0031] Figure 3 It is a construction schematic diagram of step S5 of the present invention.

[0032] Figure 4 This is the equipment layout diagram of the excavation area W100 of the present invention.

[0033] Figure 5 This is a schematic diagram of transporting waste soil from excavation area W1 to excavation area W100 according to the present invention. DETAILED DESCRIPTION

[0034] The following description of the embodiments will help the public better understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention. Any changes to the definitions of components or technical features, or formal rather than substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0035] In this application, unless otherwise clearly specified or limited, the terms "installation", "connection", "fixation" 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, or it can be internal communication between two elements, or it can be only surface contact, or surface contact connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Embodiment 1:

[0037] A construction method for consolidating soil in a limited space comprises the following construction steps:

[0038] S1: Pre-treat the side wall of the foundation pit;

[0039] S2: See Figure 1 , the replacement area is divided into excavation areas. Specifically, the first row of excavation areas are numbered from left to right as W1, W2, W3, W4, and W5, and the second row of excavation areas are numbered from left to right as W6, W7, W8, W9, and W10. Excavation areas W1-W10 are all rectangular partitions, and all rectangular partitions have the same size; diagonal jump excavation is adopted, and the diagonal jump excavation includes two routes, the first route is W1-W7-W3-W9-W5, and the second route is W6-W2-W8-W4-W10;

[0040] S3: See Figure 2 , put the waste soil in the current excavation area into the previous excavation area, install the polymer fluidized solidified soil on-site mixing equipment in the previous excavation area, put the waste soil in the excavation area W1 into the open space for standby use, put the waste soil in the excavation area W7 into the excavation area W1, and install the polymer fluidized solidified soil on-site mixing equipment in the excavation area W1;

[0041] S4: Prefabricated polymer solution:

[0042] S41: Selecting the polymer material as one of polyacrylamide, sulfonated oil, modified water glass, epoxy resin or a combination thereof;

[0043] S42: mixing the selected polymer material with deionized water according to a proportion, stirring to dissolve, stirring at a speed of 100 rpm for 120 minutes;

[0044] S43: dihydroxymethylbutyric acid, carboxymethyl cellulose, xanthan gum, and lignin sulfonate are mixed and dissolved with deionized water respectively;

[0045] S44: mixing and stirring the dissolved polymer material solution and other component solutions; adding various polymer solutions into the container in turn and mixing and stirring at room temperature;

[0046] S45: after mixing and stirring, fermentation treatment is performed, the all-purpose bacteria king is added and fermented at 25° C. for 7 days, a curing agent is prepared, and the curing agent is sealed and stored;

[0047] According to the amount of waste soil, the corresponding amount of prefabricated polymer solution is added to mix the polymer fluidized solidified soil, and the mixed polymer fluidized solidified soil is directly poured into the excavation area;

[0048] S5: See Figure 3 ,After the waste soil excavation in excavation area W7 is completed, the excavator moves to excavation area W3 in a diagonal jump excavation mode, while the excavation area W7 simultaneously completes the replacement work of polymer fluidized solidified soil;

[0049] S6: After the polymer fluidized solidified soil on-site mixing equipment is hoisted into the excavated area W3, the excavated area W7 that has been replaced is cured by watering and covering.

[0050] S7: See Figure 1 , repeat S3-S6, see Figure 4 and Figure 5 After the excavation of excavation area W10 is completed, the waste soil of excavation area W1 is placed in excavation area W100 for mixing with polymer fluidized solidified soil and replacement, and the replacement of all excavation areas is completed.

[0051] The stirring device includes a setting for in-situ stirring, and the stirred material is backfilled into the corresponding filling area; the stirring device includes a stirring drum, a soil discharge mechanism and a curing agent addition port; the soil discharge mechanism is a spiral mechanism, and the spiral mechanism is configured to transport the soil from the in-situ stirring to the position where replacement filling is required.

[0052] A frame-type support is provided in the excavation area. After the excavation is completed, the frame-type support is implanted into the corresponding excavation area. During excavation, mutual interference between foundation pits can be prevented, and the support body can be played as a temporary support. After the excavation is completed, the support body can be removed or retained as a foundation pit treatment.

[0053] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0054] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A construction method for consolidating soil in a limited space, characterized in that: The construction steps include: S1: Pre-treat the side wall of the foundation pit; S2: Divide the replacement area into excavation areas, specifically into upper and lower half areas, and the upper and lower half areas are respectively divided into multiple rectangular partitions, all rectangular partitions have the same size, and diagonal jump excavation is adopted; S3: placing the waste soil in the current excavation area into the previous excavation area, and installing a polymer fluidized solidified soil on-site mixing device in the previous excavation area; S4: according to the amount of waste soil, a corresponding number of prefabricated polymer solutions are added to mix the polymer fluidized solidified soil, and the mixed polymer fluidized solidified soil is directly poured into the excavation area; S5: After the waste soil in the current excavation area is excavated, the excavator moves to the next excavation area according to the diagonal jump excavation, and the polymer fluidized solidified soil replacement work is completed in the previous excavation area at the same time; S6: After hoisting the polymer fluidized solidified soil on-site mixing equipment to the next excavated area, the excavated area that has been replaced is maintained by watering and covering; S7: Repeat S3-S6 until all excavated areas are backfilled.

2. The construction method for consolidating soil in a limited space according to claim 1, characterized in that: In S2, the replacement area is divided into excavation areas by numbering the first row of excavation areas from left to right as W1, W2, W3, W4, and W5, and the second row of excavation areas are numbered from left to right as W6, W7, W8, W9, and W10. The diagonal skip excavation includes two routes, the first route is W1-W7-W3-W9-W5, and the second route is W6-W2-W8-W4-W10.

3. The construction method for consolidating soil in a limited space according to claim 2, characterized in that: In S3, the waste soil in the excavation area W1 is placed in an open space for standby use. When the excavation of the excavation area W10 is completed, the waste soil in the excavation area W1 is placed in the excavation area W10 for mixing with polymer fluidized solidified soil and replacement filling.

4. The construction method for consolidating soil in a limited space according to claim 2, characterized in that: In S3, the waste soil from the excavation area W7 is placed in the excavation area W1, and a polymer fluidized solidified soil on-site mixing device is installed in the excavation area W1.

5. The construction method for consolidating soil in a limited space according to claim 1, characterized in that: In S4, prefabricated polymer solutions are also included: S41: Selecting the polymer material as one of polyacrylamide, sulfonated oil, modified water glass, epoxy resin or a combination thereof; S42: mixing the selected polymer material with deionized water according to a proportion, stirring to dissolve, stirring at a speed of 100 rpm for 120 minutes; S43: dihydroxymethylbutyric acid, carboxymethyl cellulose, xanthan gum, and lignin sulfonate are mixed and dissolved with deionized water respectively; S44: mixing and stirring the dissolved polymer material solution and other component solutions; adding various polymer solutions into the container in turn and mixing and stirring at room temperature; S45: After mixing and stirring, fermentation is carried out, and the all-purpose bacteria king is added to ferment at 25°C for 7 days, and a curing agent is prepared, which is then sealed and stored.

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