A grouting reinforcement method for an underground mined connection passage in a shield tunnel section

Abstract

An embodiment of the present application provides a grouting reinforcement method for an underground excavation connecting passage in a shield tunnel section. The method includes: arranging a plurality of grouting conduits on the segment linings of the shield tunnel sections on both sides to grout and reinforce the construction area of the connecting passage; demolishing the upper bench of the connecting passage by demolishing the segment lining of one side of the shield tunnel section; driving grouting conduits downward from the upper bench to grout and reinforce the pump house area; constructing the lower bench below the upper bench and demolishing the segment lining of the shield tunnel section on the other side, so that the connecting passage penetrates through the shield tunnel sections on both sides; excavating a wastewater pump house in the pump house area, and successively excavating two wastewater ponds downward on both sides of the wastewater pump house and respectively grouting and reinforcing them. By grouting and reinforcing the pump house area from the upper bench, the length of the grouting conduit can be effectively reduced, and the problem of grout leakage can be avoided. At the same time, by decomposing the timing sequence of the grouting reinforcement of the pump house area and adopting the method of two-stage reinforcement, targeted reinforcement can be carried out on the pump house area to further improve the grouting reinforcement effect.

Description

Technical Field

[0001] This application relates to the field of shield tunnel connection passage construction, and in particular to a grouting reinforcement method for shield tunnel mined connection passage. Background Art

[0002] Some shield tunnel connection passages cannot be grouted from the ground according to the site conditions. In order to ensure water-free construction, deep hole grouting is used to stop water before the construction of the connection passage. The indexes such as slurry ratio and grouting pressure should be determined according to experiments. The grouting slurry generally uses cement-sodium silicate double-fluid slurry, and additives can be added according to the formation conditions to adjust the setting time and injectability of the slurry. At present, this reinforcement method generally uses the one-time grouting reinforcement method by breaking through the shield segment. However, when using this reinforcement method to reinforce the pump house area, the grouting conduit is relatively long, and problems such as slurry leakage and high grouting pressure will occur, resulting in poor reinforcement effect and slow efficiency. Summary of the Invention

[0003] In order to solve the above technical defects, a grouting reinforcement method for shield tunnel mined connection passage is provided in the embodiments of this application.

[0004] The embodiments of this application provide a grouting reinforcement method for shield tunnel mined connection passage, and the method includes:

[0005] Setting a plurality of grouting conduits on the shield tunnel segments on both sides to grout and reinforce the construction area of the connection passage;

[0006] Breaking through the shield tunnel segment on one side to construct the upper bench of the connection passage;

[0007] Driving grouting conduits from the upper bench downwards to grout and reinforce the pump house area;

[0008] Constructing the lower bench below the upper bench and breaking through the shield tunnel segment on the other side to connect the two shield tunnels on both sides;

[0009] Excavating a wastewater pump house in the pump house area, and sequentially excavating two wastewater pools downwards on both sides of the wastewater pump house and respectively grouting and reinforcing them.

[0010] By using the grouting reinforcement method for shield tunnel mined connection passage provided in the embodiments of this application, grouting and reinforcement are carried out from the upper bench to the pump house area, which can effectively reduce the length of the grouting conduit, avoid slurry leakage problems, reduce construction risks, and improve construction efficiency and grouting reinforcement effect. At the same time, by decomposing the timing of grouting reinforcement in the pump house area and using the method of two-time reinforcement, targeted reinforcement can be carried out on the pump house area to further improve the grouting reinforcement effect. Brief Description of the Drawings

[0011] The accompanying drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0012] Figure 1 It is a schematic flow diagram of a grouting reinforcement method for an underground excavation connection passage in a shield tunnel section provided in Embodiment 1 of the present application;

[0013] Figure 2 It is a schematic plan layout diagram of the grouting reinforcement of the connection passage;

[0014] Figure 3 It is a schematic longitudinal section layout diagram of the grouting reinforcement of the connection passage;

[0015] Figure 4 It is a schematic diagram of the grouting reinforcement effect in the construction area before the construction of the connection passage;

[0016] Figure 5 It is for Figure 2 The sectional view taken along line A-A of;

[0017] Figure 6 It is a schematic diagram of the upper bench;

[0018] Figure 7 It is a schematic longitudinal section layout diagram of the grouting reinforcement in the pump house area;

[0019] Figure 8 It is a schematic diagram of the overall grouting reinforcement effect of the connection passage;

[0020] Figure 9 It is a schematic diagram of the lower bench;

[0021] Figure 10 It is for Figure 9 The sectional view taken along line B-B of;

[0022] Figure 11 It is a schematic diagram of the pump house area;

[0023] Figure 12 It is for Figure 11 The sectional view taken along line C-C of;

[0024] Figure 13 It is a schematic layout diagram of the first wastewater tank (left side) and the second wastewater tank (right side).

[0025] Reference numerals:

[0026] 1, segment; 2, connection passage; 3, grouting hole; 4, upper bench; 5, pump house area; 6, lower bench; 7, advanced small duct Detailed implementation manners

[0027] In order to make the technical solutions and advantages in the embodiments of the present application clearer and more understandable, the exemplary embodiments of the present application are further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0028] As Figure 1 shown, this embodiment provides a grouting reinforcement method for a shield tunnel mined connecting passage. The method includes:

[0029] S101. Set a plurality of grouting ducts on the segment linings 1 of the two shield tunnels to grout and reinforce the construction area of the connecting passage 2.

[0030] In this embodiment, by setting grouting ducts on the segment linings 1 of the shield tunnel, the construction area of the connecting passage 2 is first grouted and reinforced, as Figures 2 to 4 shown. Among them, in this embodiment, three rows of grouting ducts are respectively arranged on the segment linings 1 of the two shield tunnels, and each row of grouting ducts is provided with three grouting holes 3, as Figure 5 shown. Compared with the conventional arrangement quantity of the grouting ducts on the segment linings 1 of the shield tunnel and the opening quantity of the grouting holes 3, both are reduced, greatly reducing the water leakage and construction risks brought about when arranging the grouting ducts and opening the grouting holes 3.

[0031] S102. Demolish the upper bench 4 of the connecting passage on one side of the segment lining 1 of the shield tunnel.

[0032] Specifically, as Figure 6 shown, demolish the segment lining 1 on one side, excavate and expand the connecting passage 2 from the hole in the segment lining 1, and use the bench method to reserve the core soil to excavate the upper bench 4. During the excavation of the upper bench 4, the lattice steel frame is erected synchronously to ensure the safety of the excavation process. After excavating to the segment lining 1 on the opposite side, according to the monitoring and measurement situation, back-excavation construction is carried out on the upper bench 4. After the back-excavation construction is completed, the upper bench 4 of the connecting passage is penetrated and closed.

[0033] In this embodiment, when excavating the upper bench 4, it is necessary to note that the excavation height of the upper bench 4 should meet the height requirements of the upper grouting machinery. At the same time, a temporary steel support structure is erected at the position of the segment lining 1 of the shield tunnel to be demolished to ensure the structural stability at the initial stage of excavation. Before demolishing the segment lining 1, exploration holes can be drilled on the segment lining 1 first. Through the exploration holes, the grouting reinforcement state of the construction area of the connecting passage 2 is observed, and the water storage state in the grouting reinforcement area of the connecting passage 2 is judged to ensure that the construction area of the connecting passage 2 is a water-free environment. During the excavation of the upper bench 4, in this embodiment, advanced small ducts 7 are also drilled, as Figure 10 shown. The advanced small ducts 7 are located at the tops of both ends of the connecting passage 2. Through the advanced small ducts 7, the two ends of the connecting passage 2 can be grouted and reinforced.

[0034] S103. Drive grouting conduits downward from the upper bench 4 to grout and reinforce the pump house area 5.

[0035] Specifically, as Figure 7 and Figure 8 shown, after the construction of the upper bench 4 in this embodiment is completed, drive grouting conduits downward from the upper bench 4 to perform grouting and reinforcement operations on the lower pump house area 5. Since grouting and reinforcement are directly carried out downward from the upper bench 4, the required path for reinforcement is shorter, the length of the required grouting conduits is also shorter, less slurry leakage occurs, and the grouting effect is better. It should be noted here that when driving grouting conduits downward from the upper bench 4 to grout and reinforce the pump house area 5, the grouting thickness is not less than 3 meters to ensure that the working environment for subsequent grouting and reinforcement operations is a water-free environment.

[0036] S104. Construct the lower bench 6 below the upper bench 4 and break through the segment 1 of the other shield tunnel section, and the connection passage 2 penetrates through the two shield tunnel sections on both sides.

[0037] After the grouting and reinforcement operations on the lower pump house area 5 are completed, construct the lower bench 6 of the connection passage. According to the monitoring and measurement during the construction, break through the segment 1 of the other shield tunnel section, as Figure 9 shown. At this time, the connection passage 2 penetrates through the two shield tunnel sections on both sides.

[0038] After the construction of the lower bench 6 is completed, the integral secondary lining structure construction can be carried out on the upper bench 4 and the lower bench 6 of the connection passage to ensure the overall stability of the connection passage 2.

[0039] S105. Excavate a wastewater pump house in the pump house area 5, and sequentially excavate two wastewater ponds downward on both sides of the wastewater pump house and perform grouting and reinforcement respectively.

[0040] Specifically, first excavate a wastewater pump house in the pump house area 5. Then, excavate the first wastewater pond downward on one side of the wastewater pump house ( Figure 13 shown on the left), and erect a grille steel frame and perform grouting and reinforcement during the excavation of the first wastewater pond. After the first wastewater pond is excavated to the bottom and sealed at the bottom, excavate the second wastewater pond on the other side of the wastewater pump house ( Figure 13 shown on the right), and erect a grille steel frame and perform grouting and reinforcement during the excavation of the second wastewater pond. The second wastewater pond is excavated to the bottom and sealed at the bottom, as Figure 11 and Figure 12 shown. Finally, lay a waterproof layer in the two wastewater ponds to perform secondary lining structure construction and perform grouting and reinforcement until the strength of the secondary lining structure reaches the preset strength.

[0041] The grouting reinforcement method for the shield tunnel section's mined connection passage 2 provided in this embodiment can effectively reduce the length of the grouting ducts by grouting and reinforcing from the upper bench 4 to the pump house area 5, avoid the problem of grout leakage, reduce construction risks, and improve construction efficiency and grouting reinforcement effect. At the same time, by decomposing the grouting reinforcement sequence of the pump house area 5 and adopting the method of two-stage reinforcement, targeted reinforcement of the pump house area 5 can be carried out to further improve the grouting reinforcement effect.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In the present application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0045] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0046] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

1. A grouting reinforcement method for an underground connection passage in a shield tunnel section, characterized in that, The method includes: Arranging a plurality of grouting ducts on the segment linings of the shield tunnels on both sides to grout and reinforce the construction area of the connecting passage; Breaking through the segment lining of one side of the shield tunnel to construct the upper bench of the connecting passage; Driving grouting ducts downward from the upper bench to grout and reinforce the pump house area; Constructing the lower bench below the upper bench and breaking through the segment lining of the other side of the shield tunnel, so that the connecting passage penetrates through the shield tunnels on both sides; Excavating a wastewater pump house in the pump house area, and successively excavating two wastewater ponds downward on both sides of the wastewater pump house and respectively grouting and reinforcing them; The process of breaking through the segment lining of one side of the shield tunnel to construct the upper bench of the connecting passage includes: Breaking through the segment lining of one side of the shield tunnel, excavating the upper bench of the connecting passage to the segment lining of the other side of the shield tunnel, and synchronously erecting lattice girders during the excavation of the upper bench; Performing reverse excavation construction on the upper bench of the connecting passage; After the reverse excavation construction of the upper bench, the upper bench is penetrated and closed; The process of breaking through the segment lining of one side of the shield tunnel to construct the upper bench of the connecting passage further includes: Driving advanced small ducts, and the advanced small ducts are located at the tops of both ends of the connecting passage; Grouting and reinforcing the areas at both ends of the connecting passage through the advanced small ducts; Before breaking through the segment lining of one side of the shield tunnel to construct the upper bench of the connecting passage, the method further includes: Drilling exploration holes on the segment lining of the shield tunnel; Observing the grouting and reinforcement state of the construction area of the connecting passage through the exploration holes and judging the water storage state of the grouting and reinforcement area of the connecting passage.

2. The method according to claim 1, characterized in that, Before breaking through the segment lining of one side of the shield tunnel to construct the upper bench of the connecting passage, the method further includes: Erecting a temporary steel support structure at the position of the segment lining of the shield tunnel to be broken through.

3. The method according to claim 1, characterized in that, Before excavating the wastewater pump house in the pump house area, the method further includes: Performing secondary lining reinforcement on the connecting passage.

4. The method according to claim 1, characterized in that, The process of successively excavating two wastewater ponds downward on both sides of the wastewater pump house and respectively grouting and reinforcing them includes: Excavating the first wastewater pond downward on one side of the wastewater pump house, erecting lattice girders and grouting and reinforcing them during the excavation of the first wastewater pond; After the first wastewater pond is excavated to the bottom and sealed, excavating the second wastewater pond on the other side of the wastewater pump house, erecting lattice girders and grouting and reinforcing them during the excavation of the second wastewater pond; The second wastewater pond is excavated to the bottom and sealed.

5. The method according to claim 1, characterized in that, After successively excavating two wastewater ponds downward on both sides of the wastewater pump house and respectively grouting and reinforcing them, the method further includes: Laying waterproof layers on the two wastewater ponds to construct the secondary lining structure, and performing grouting and reinforcement until the strength of the secondary lining structure reaches the preset strength.

6. The method according to claim 1, characterized in that, Three rows of grouting ducts are respectively arranged on the segment linings of the shield tunnels on both sides, and each row of grouting ducts has three grouting holes.

7. The method according to claim 1, characterized in that, When driving grouting ducts downward from the upper bench to grout and reinforce the pump house area, the grouting thickness is not less than 3 meters.

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