Method for improving anti-seepage performance of side wall of subway station by improving pouring formwork

Abstract

The invention relates to the field of subway station buildings, in particular to a method for improving the anti-seepage performance of a side wall of a subway station by improving a pouring formwork, and the method comprises the following steps: S1, excavating a deep pit of a continuous wall; s2, deep pit tamping; s3, laying a template; s4, constructing a cement mortar leveling layer; s5, waterproof layer construction; s6, side wall pouring is conducted, a main body structure concrete pouring formwork is laid, and the main body structure concrete pouring formwork is obliquely arranged at the position of the construction joint; and S7, concrete is poured, the concrete is adopted for pouring the concrete pouring formwork of the main body structure, and the construction joint of the waterproof reinforced concrete side wall is inclined. When the portion, located on the outer side of the subway station, of the underground continuous wall makes contact with seepage water, water flow enters the construction joints, the seepage water flow is drained away along the construction joints and prevented from penetrating through the underground continuous wall, and the overall waterproof performance of the subway station is improved.

Description

Technical Field

[0001] The invention relates to the field of subway station construction, and in particular to a method for improving the anti-seepage performance of a subway station side wall by improving a casting formwork. Background Art

[0002] In the reverse construction subway station, the construction joints of the side walls of the main structure are typical weak leakage locations. Groundwater can easily flow into the interior along the construction joints. After the subway station is built, leakage control is difficult, costly, and ineffective. In addition, the proportion of re-leakage after control is large, affecting the operation and maintenance of the subway. In severe cases, it even affects the durability of the main structure and causes engineering hazards. Therefore, it is necessary to improve the anti-seepage performance of the subway station.

[0003] The waterproofing of the main structure of the subway station mainly relies on the waterproofing performance of the structure itself, and consists of three parts: the retaining structure, the additional flexible waterproof layer, and the self-waterproofing of the main structure concrete. The first is the waterproofing of the station foundation pit retaining structure. When the ground-connected wall is used as the supporting structure, the waterproofing performance of the ground-connected wall itself is the main factor. The waterproofing between the retaining structure and the main structure mainly relies on the additional fully-covered flexible waterproof layer material. The waterproofing of the main structure concrete mainly relies on the waterproofing performance of the concrete material itself after the main structure is built.

[0004] At present, the research on the leakage problem of subway stations mainly focuses on the improvement of construction technology and passive plugging and repair. The improvement of construction technology includes enhancing the casting quality of ground walls or pile rows, waterproofing the joints, reducing the burrs and chamfers of the base surface when installing flexible waterproof layers, improving the maintenance level of the main structure concrete, and improving the treatment level of reserved holes and seams in the project. When leakage occurs, the treatment follows the principle of plugging as the main and drainage as the auxiliary. For possible leakage of structural surfaces or structural joints, grouting flexible materials are used to repair them. However, the treatment and repair effect is not durable. When the stratum water pressure increases, it will be damaged and leak again. Therefore, how to reduce the seepage of the side walls of subway stations when leakage occurs is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to solve the problem of excessive water seepage in the side walls of subway stations when leakage occurs, the present invention provides a method for improving the anti-seepage performance of the side walls of subway stations by improving the casting formwork to solve the above problem. The technical solution adopted by the present invention to solve its technical problems is: a method for improving the anti-seepage performance of the side wall of a subway station by improving the casting template, comprising the following steps: S1, excavation of a continuous wall deep pit, surveying the site and removing ground obstacles, and then excavating the ground to a predetermined depth to form a continuous wall deep pit; S2, tamping the deep pit, using a tamping machine to tamp the excavated ground and the continuous wall deep pit; S3, template laying, laying the template in the continuous wall deep pit, then hoisting the steel cage and pouring concrete, and forming an underground continuous wall after the concrete solidifies; S4, cement mortar leveling layer construction, applying cement mortar on the outer side of the underground continuous wall to S5, waterproof layer construction, laying waterproof membrane outside the cement mortar leveling layer to form a membrane waterproof layer; S6, side wall casting, digging a side wall pit on the ground outside the waterproof membrane and hoisting a steel cage into the side wall pit, and then laying the main structure concrete casting template, the main structure concrete casting template is set obliquely at the construction joint position; S7, concrete casting, using concrete to cast the main structure concrete casting template, after the concrete solidifies, a waterproof reinforced concrete side wall is formed, and the construction joint of the waterproof reinforced concrete side wall is oblique. Preferably, in S2, the top side walls of the continuous wall pit are widened to both sides and concrete is poured, and a top protective wall is formed after the concrete solidifies.

[0006] Preferably, in S6, the joints of the main structure concrete casting formwork are staggered and overlapped.

[0007] Preferably, in S7, the cross-sectional shape of the construction joint is stepped and the height gradually decreases from the inside of the subway station to the outside of the subway station.

[0008] Preferably, in S7, mud is first applied to the construction joint of the waterproof reinforced concrete side wall, and then cement mortar is applied for leveling after the mud solidifies.

[0009] Preferably, in S6, the bottom of the steel cage is bent to form an L-shaped structure.

[0010] Preferably, the waterproof roll layer is a self-adhesive waterproof roll.

[0011] The beneficial effect of the present invention is that the construction joint at the underground continuous wall is set obliquely. When the part of the underground continuous wall located outside the subway station is exposed to water seepage, water will flow into the construction joint. Since the construction joint is set obliquely, the leaked water can be discharged along the construction joint to prevent the leaked water from passing through the underground continuous wall, thereby avoiding leakage inside the subway station and improving the overall waterproof performance of the subway station. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. 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.

[0013] Figure 1 It is a structural schematic diagram of an optimal embodiment of the present invention for improving the side wall of a subway station by arranging guide plates on the side wall.

[0014] Figure numerals: 1. underground continuous wall; 2. cement mortar leveling layer; 3. membrane waterproofing layer; 4. waterproof reinforced concrete side wall; 5. construction joint. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0017] like Figure 1 As shown, the present invention provides an embodiment of a method for improving the anti-seepage performance of the side wall of a subway station by improving the casting formwork, comprising the following steps: S1. Excavation of continuous wall deep pit: survey the site and remove ground obstacles, then excavate the ground to the predetermined depth to form a continuous wall deep pit.

[0018] S2. Ramming of the deep pit: Use a rammer to ram the ground and the continuous wall deep pit after excavation, widen the top side walls of the continuous wall deep pit to both sides and pour concrete, and form a top protective wall after the concrete solidifies. The top protective wall can protect the top of the excavated continuous wall deep pit to prevent debris from falling when laying the formwork in the continuous wall deep pit, which is beneficial to maintaining the stability of the side walls of the continuous wall deep pit.

[0019] S3. Formwork laying: Lay the formwork in the deep pit of the continuous wall, then hoist the steel cage and pour concrete, and after the concrete solidifies, form the underground continuous wall 1.

[0020] S4. Construction of cement mortar leveling layer. Apply cement mortar on the outer side of the underground continuous wall 1 for leveling. After the cement mortar solidifies, a cement mortar leveling layer 2 is formed. By arranging the cement mortar leveling layer on the outer side of the underground continuous wall 1, the waterproof surface of the underground continuous wall 1 is kept flat, and liquid is prevented from being retained on the surface of the underground continuous wall 1 during leakage, thereby keeping the underground continuous wall 1 dry. At the same time, the cement mortar leveling layer can also prevent the rough surface of the underground continuous wall 1 from scratching the subsequently laid roll waterproofing layer 3, and is beneficial to reducing the gaps between materials and preventing the roll waterproofing layer 3 from falling off.

[0021] S5. Waterproof layer construction. Waterproof membrane is laid outside the cement mortar leveling layer 2 to form a membrane waterproof layer 3. The membrane waterproof layer 3 adopts a self-adhesive waterproof membrane. The self-adhesive waterproof membrane can be stably adhered to one side of the underground continuous wall 1 and fit tightly with the cement mortar leveling layer to improve the waterproof performance of the underground continuous wall 1. That is, the membrane waterproof layer 3 prevents liquid from directly entering the subway station during large-scale leakage. When the waterproof membrane is damaged, the liquid is blocked again by the waterproof reinforced concrete side wall 4 behind it after passing through the waterproof membrane to avoid large-scale diffusion of the leaked liquid.

[0022] S6, side wall casting, dig a side wall pit on the ground outside the waterproof membrane and hoist a steel cage into the side wall pit, then lay the main structure concrete casting template, the joints of the main structure concrete casting template are staggered and overlapped, the main structure concrete casting template is set obliquely at the construction joint 5 position, after the concrete is poured, the template set obliquely on the top can keep the top of the concrete in an inclined state for solidification, thereby forming an oblique construction joint 5, and then pour concrete to form a waterproof reinforced concrete side wall 4, and the bottom of the steel cage is bent to form an L-shaped structure.

[0023] S7, pouring concrete, using concrete to pour concrete on the main structure concrete pouring formwork, and forming a waterproof reinforced concrete side wall 4 after the concrete solidifies, and the construction joint 5 of the waterproof reinforced concrete side wall 4 is oblique, and the cross-sectional shape of the construction joint 5 is stepped, and the height gradually decreases from the inside of the subway station to the outside of the subway station, and mud is applied to the construction joint 5 of the waterproof reinforced concrete side wall 4, and cement mortar is applied for leveling after the mud solidifies. When the underground continuous wall 1 located outside the subway station is exposed to water seepage, water will enter the construction joint 5. Since the construction joint 5 is obliquely set and has a stepped cross-section, the leaked water can be discharged along the construction joint 5 to prevent the leaked water from passing through the underground continuous wall 1, thereby avoiding leakage inside the subway station and improving the overall waterproof performance of the subway station.

[0024] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above are only preferred implementation methods of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. Method for improving the anti-seepage performance of subway station side walls by improving the casting formwork, It is characterized in that The following steps are involved: S1. Excavation of the continuous wall pit: survey the site and remove ground obstacles, then excavate the ground to the predetermined depth to form the continuous wall pit; S2, deep pit compaction, using compactors to compact the excavated ground and the deep pit of the continuous wall; S3, laying the formwork, laying the formwork in the deep pit of the continuous wall, then hoisting the steel cage and pouring concrete, and after the concrete solidifies, forming the underground continuous wall (1); S4, cement mortar leveling layer construction, applying cement mortar on the outer side of the underground continuous wall (1) for leveling, and forming a cement mortar leveling layer (2) after the cement mortar solidifies; S5, waterproof layer construction, laying waterproofing coiled material outside the cement mortar leveling layer (2) to form a coiled waterproofing layer (3); S6, side wall pouring, digging a side wall pit on the ground outside the waterproof membrane and hoisting a steel cage into the side wall pit, and then laying a main structure concrete pouring template, wherein the main structure concrete pouring template is obliquely arranged at the construction joint (5); S7, pouring concrete, using concrete to pour concrete on the main structure concrete pouring template, and forming a waterproof reinforced concrete side wall (4) after the concrete solidifies, and the construction joint (5) of the waterproof reinforced concrete side wall (4) is in an oblique shape.

2. The method for improving the anti-seepage performance of the side wall of a subway station by improving the casting formwork as claimed in claim 1, Features: In S2, the top side walls of the continuous wall pit are widened to both sides and concrete is poured, and a top protective wall is formed after the concrete solidifies.

3. The method for improving the anti-seepage performance of the side wall of a subway station by improving the casting formwork as claimed in claim 1, Features: In S6, the joints of the main structure concrete casting formwork are overlapped with staggered joints.

4. The method for improving the anti-seepage performance of the side wall of a subway station by improving the casting formwork according to claim 1, Features: In S7, the cross-sectional shape of the construction joint (5) is stepped and the height gradually decreases from the inside of the subway station to the outside of the subway station.

5. The method for improving the anti-seepage performance of the side wall of a subway station by improving the casting formwork according to claim 1, Features: In S7, mud is first applied to the construction joint (5) of the waterproof reinforced concrete side wall (4), and after the mud solidifies, cement mortar is applied for leveling.

6. The method for improving the anti-seepage performance of the side wall of a subway station by improving the casting formwork according to claim 1, Features: In S6, the bottom of the steel cage is bent to form an L-shaped structure.

7. The method for improving the anti-seepage performance of the side wall of a subway station by improving the casting formwork according to claim 1, Features: The waterproof roll material layer (3) is a self-adhesive waterproof roll material.

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