A method of constructing a barrier to mud and water underground wall

Abstract

The application relates to the technical field of building construction, in particular to a construction method of an underground wall capable of blocking mud and water, a prefabricated underground wall is arranged in front of a reserved hole of a caisson, high plastic clay is filled in the underground wall; fine stone concrete with water stopping effect is poured around the underground wall; counterweight loading is arranged above the high plastic clay; when a pipe jacking passes through the underground wall, the high plastic clay is tightly combined with a pipeline of the pipe jacking under the action of the counterweight to form a mud film. The application has the advantages that the soil body is replaced in a small range, after the pipe jacking passes through the underground wall, the pipeline of the pipe jacking is tightly combined with the high plastic clay under the action of the counterweight, a mud film is formed, water and soil outside the reinforced area can be prevented from flowing into the well, and the risks of water and sand gushing are avoided; the construction investment cost is relatively small, and the risks of water and sand gushing are avoided.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a construction method for an underground wall that can block mud and water. Background Technology

[0002] With the rapid development of urbanization, the ever-increasing population has placed higher demands on the infrastructure of most cities in my country. Water supply pipeline projects are among the most common municipal engineering projects, and their construction quality is directly related to the public's drinking water needs. Pipe jacking projects involve designing two foundation pits at the pipeline's starting and receiving points, with the receiving pit using a caisson sinking method. In water-rich sandy soil areas, there is a common risk of water and sand inrush during pipe jacking. Generally, designers improve the soil quality in the entry area, often using deep mixing piles for soil reinforcement, a method that has proven effective in practice. However, when the pipeline is located in a confined aquifer, under the influence of high pressure head, water and soil outside the reinforced area will flow along the gap between the pipe wall and the soil, entering the well during pipe jacking. If this water cannot be contained, it can lead to significant economic losses.

[0003] In summary, when jacking tunnels in sandy soil areas with high water pressure, unilateral soil improvement cannot completely eliminate the risks of water and sand inrush. The key issue is that sandy soil flows with water, and there is no adhesion between soil particles. Solving this problem essentially involves soil replacement; however, since pipe jacking is generally deep, large-scale soil replacement is uneconomical. Therefore, developing a construction method for underground walls that can block mud and water is crucial to solving the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a construction method for an underground wall that can block mud and water. By filling the interior of a reconstituted bamboo frame wall with highly plastic clay, soil replacement is achieved within a small area. When the jacking pipe passes through this underground wall, under the action of counterweight, the jacking pipe and the highly plastic clay are tightly bonded together, forming a mud film that can prevent water and soil from outside the reinforced area from flowing into the well, thereby avoiding the risk of water and sand inrush.

[0005] The objective of this invention is achieved through the following technical solutions: A construction method for an underground wall capable of blocking mud and water, used in pipe jacking construction, wherein the pipe jacking construction employs a caisson sinking method at the pipe receiving point, characterized in that the construction method includes the following steps: A prefabricated underground wall is constructed in front of the reserved opening of the caisson, and the interior of the underground wall is filled with highly plastic clay. Fine aggregate concrete with a water-stopping effect was poured around the perimeter of the underground wall. A counterweight is placed on top of the highly plastic clay. When the pipe jacking passes through the underground wall, the highly plastic clay, under the action of the counterweight, tightly adheres to the pipe to form a mud film.

[0006] The underground wall comprises a hollow frame wall structure made of reconstituted bamboo, and the highly plastic clay is filled inside the hollow frame wall structure.

[0007] Several counterweights are arranged at intervals above the highly plastic clay.

[0008] The depth of the underground wall structure is a certain distance below the bottom of the reserved opening of the caisson.

[0009] The advantages of this invention are: it replaces the soil within a small area, and when the jacking pipe passes through this underground wall, under the action of counterweight, the jacking pipe is tightly bonded to the highly plastic clay and forms a mud film, which can prevent water and soil outside the reinforced area from flowing into the well, thereby avoiding the risk of water inrush and sand inrush; the construction investment cost is relatively small, and the risk of water inrush and sand inrush is avoided. Attached Figure Description

[0010] Figure 1 This is an elevation view of the layout of the present invention; Figure 2 This is a layout plan view of the present invention. Detailed Implementation

[0011] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: like Figure 1-2 As shown in the figure, labels 1-6 represent: 1. Reconstituted bamboo, 2. High plasticity clay, 3. Caisson, 4. Reserved opening, 5. Fine stone concrete, and 6. Counterweight.

[0012] Example: Figure 1 and Figure 2 As shown, the construction method of the underground wall capable of blocking mud and water in this embodiment includes the following steps: 1) A prefabricated underground wall is constructed in front of the reserved opening 4 of the caisson 3. The main body of the underground wall is a hollow frame wall structure made of reconstituted bamboo, with an internal cavity. The thickness of the reconstituted bamboo walls on both sides is not less than 200mm, and the interior is filled with high-plasticity clay 2, with a fill width of 1-2m. The reconstituted bamboo is lightweight and has good mechanical and physical properties, possessing a certain degree of self-support and providing restraint for the high-plasticity clay 2. The depth of the underground wall is not less than 3m below the bottom of the reserved opening 4 of the caisson 3, and the width is 6-8m. The underground wall is located in front of the reserved opening 4 of the caisson 3, close to the caisson 3. During construction, the prefabricated underground wall is placed in the pre-constructed trench section.

[0013] 2) Pour low-grade fine aggregate concrete with water-stopping effect around the precast underground wall.

[0014] 3) After the piles are completed, several counterweights are added at intervals on the top of the underground wall.

[0015] In this embodiment, an underground wall is built in front of the reserved opening 4 of the caisson 3 to replace the soil at this location. After the jacking pipe passes through this underground wall, under the action of the counterweight 6, the jacking pipe and the filling high plastic clay 2 are closely attached to form a mud film, which can prevent water and soil outside the reinforced area from flowing into the well, thereby avoiding the risk of water inrush and sand inrush.

[0016] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A construction method for an underground wall capable of blocking mud and water, used in pipe jacking construction, wherein the pipe jacking construction employs a caisson sinking method at the pipe receiving point, characterized in that: The construction method includes the following steps: A prefabricated underground wall is constructed in front of the reserved opening of the caisson, and the interior of the underground wall is filled with highly plastic clay. Fine aggregate concrete with a water-stopping effect was poured around the perimeter of the underground wall. A counterweight is placed on top of the highly plastic clay. When the pipe jacking passes through the underground wall, the highly plastic clay, under the action of the counterweight, tightly adheres to the pipe of the pipe jacking to form a mud film. The underground wall includes a hollow frame wall structure made of reconstituted bamboo, and the highly plastic clay is filled inside the hollow frame wall structure. Several counterweights are arranged at intervals above the highly plastic clay; The depth of the underground wall structure is a certain distance below the bottom of the reserved opening of the caisson.

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