Waterproofing construction method for shield tunneling in mined tunnels

Abstract

This invention discloses a waterproofing construction method for shield tunneling reception in a mined tunnel, aiming to solve the technical problem that existing water-stopping structures cannot be directly used for waterproofing shield tunneling reception in mined tunnels. After tunnel excavation, a double-layer initial support structure is constructed in the shield receiving section of the mined tunnel, and a double-layer fiber structure is installed on the end wall for reinforcement. Since the mined tunnel construction process for the receiving chamber is the CD method, it is necessary to break down the central diaphragm wall. A steel pipe frame is set at the end wall of the shield receiving section to facilitate the binding of reinforcing bars and the installation of formwork, and installation holes and steel ring embedded parts are reserved on the formwork. After that, concrete needs to be poured, and then the formwork inside the tunnel portal is removed. The water-stopping structure is then installed through the installation holes and steel ring embedded parts. This application, in combination with the CD method, makes the water-stopping structure more effective in sealing and preventing water leakage during the shield receiving process, which is beneficial to shield receiving work in mined tunnels.

Description

Technical Field

[0001] This invention relates to the field of shield tunneling technology, specifically to a waterproof construction method for shield receiving in a mined tunnel. Background Technology

[0002] With the rapid development of modern urban construction and the increase in population, surface transportation can no longer fully meet people's daily travel needs. Expanding and utilizing underground space to alleviate urban volume and traffic pressure is an inevitable trend. The shield tunneling method, due to its rapid construction and minimal impact on the ground, has been widely promoted and applied in urban subway construction. In shield tunneling subway construction, the tunnel boring machine (TBM) enters the excavation tunnel from the launching tunnel and begins excavation. After completing the construction of a certain section of the tunnel, while maintaining the stability of the surrounding soil, it enters the receiving tunnel along the designed route to receive the shield, completing that stage of the tunneling process. The normal tunneling process is relatively safe; the main risks are concentrated in the launching and receiving stages, especially in tunnel sections with high groundwater levels and abundant groundwater resources, where the sealing performance of the tunnel entrance is extremely important. The launching and receiving stages are critical nodes in the shield tunneling process.

[0003] Shield tunneling takes place underground, and poor reinforcement of the shield receiving area can easily lead to water and sand inrush at the tunnel portal, directly affecting the normal receiving of the shield. Currently, in foreign countries, when cement-based end reinforcement is not feasible due to geological or surface conditions, horizontal freezing reinforcement is often used. However, due to limitations in the length of the reinforced body and the abundance of groundwater, the arrival and receiving of the shield still pose significant risks. Existing shield receiving waterproofing methods cannot meet the waterproofing requirements of shields in mined tunnels, exhibiting poor waterproofing performance. Therefore, a construction method that satisfies the waterproofing requirements of shield receiving in mined tunnels is needed.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The inventors discovered through research that the CD method is often used for construction of the receiving section in mined tunnels. However, the existing shield receiving methods cannot be used in conjunction with the CD method for receiving the shield machine in the receiving section of mined tunnels. Furthermore, if the existing waterproof structure for shield receiving is used directly for shield receiving, the shield receiving will fail due to poor waterproofing.

[0006] In view of at least one of the above technical problems, this disclosure provides a method for waterproofing shield receiving in a mined tunnel. After the excavation work is completed, a double-layer initial support structure is set in the receiving section of the mined tunnel. After the central partition wall is broken, templates and steel ring embedded parts are installed. After pouring concrete, the waterproof structure is installed, thereby completing the sealing and waterproofing work for shield receiving in the mined tunnel, which is beneficial to shield receiving.

[0007] According to one aspect of this disclosure, a method for waterproofing shield tunneling receivers in a mined tunnel is provided, comprising the following steps:

[0008] (1) After the tunnel excavation is completed, a double-layer initial support structure is constructed in the shield receiving section of the tunnel chamber and a double-layer fiber structure is installed on the end wall for reinforcement.

[0009] (2) Dismantle the septum;

[0010] (3) A steel pipe frame is set at the end wall of the shield receiving section to facilitate the binding of reinforcing bars and the installation of formwork, and installation holes and steel ring embedded parts are reserved on the formwork;

[0011] (4) Pouring concrete;

[0012] (5) Remove the template inside the opening and install the water-stop structure through the installation hole and the steel ring embedded part.

[0013] In some embodiments of this disclosure, the double-layer initial support structure includes an arch frame, anchor bolts, steel mesh, and a grouting structure layer sprayed therein.

[0014] In some embodiments of this disclosure, in step (2), before breaking the central diaphragm, data monitoring should be carried out on the arch settlement point, clearance convergence, ground settlement point, and working face monitoring point. After all data are stable, the central diaphragm can be broken. During the breaking, an excavator is used for chiseling.

[0015] In some embodiments of this disclosure, in step (4), the concrete strength is C35 concrete poured according to construction requirements and used as the main body in the later stage.

[0016] In some embodiments of this disclosure, in step (5), the water-stopping structure includes a rubber sealing plate disposed on the steel ring embedded part through the mounting hole, a fixing steel ring for fixing is disposed on the outside of the rubber sealing plate, and multiple hinge plates fixed on the main structure of the portal are disposed on the outside of the fixing steel ring, and the multiple hinge plates are connected to each other to form a sealing ring.

[0017] In some embodiments of this disclosure, the fixed steel ring comprises four separate rings: upper, lower, left, and right. Each separate ring includes an arcuate portion, a supporting horizontal plate that supports the arcuate portion and is disposed between its arcuate segments, and a column disposed between the supporting horizontal plate and the arcuate portion. A horizontal support column and a vertical support column are disposed between the separate rings to provide support. The column includes an inclined column and a vertical column. The supporting horizontal plate is detachably disposed on the arcuate portion, and the column is detachably disposed between the supporting horizontal plate and the arcuate portion.

[0018] In some embodiments of this disclosure, the hinge plate includes a connecting part and a fixing part that are perpendicular to each other. The connecting part is provided with bolt holes, and the fixing part is provided with lifting rings. The hinge plate is installed on the main structure of the portal frame by bolt connection.

[0019] In some embodiments of this disclosure, a steel wire rope is threaded through the lifting ring and passes through all the hinge plates, with both ends fixed to the wall of the receiving well.

[0020] One or more technical solutions provided in the embodiments of this application have at least one of the following technical effects or advantages:

[0021] 1. This application, in conjunction with the CD method, improves the sealing and water-stopping effect of the water-stopping structure during the shield tunneling process, which is beneficial for shield tunneling operations in underground tunnels.

[0022] 2. This application proposes to construct a double-layer initial support structure in the receiving section after the shield tunneling is completed, thereby enhancing the support inside the tunnel and reducing bottom subsidence, which is beneficial for sealing and water-stopping work during the later shield receiving process.

[0023] 3. This application completes the water-stopping construction in the tunnel by installing a water-stopping structure after removing the central partition wall in the tunnel, which further facilitates the shield tunneling reception in the tunnel. Attached Figure Description

[0024] Figure 1 This is a flowchart of a method according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the water-stopping structure in one embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the structure of the fixed steel ring in one embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the structure of the split ring in one embodiment of this application.

[0028] Figure 5 This is a surface subsidence trend diagram in one embodiment of this application.

[0029] Figure 6 This is a diagram showing the settlement trend of the arch in one embodiment of this application.

[0030] Figure 7 This is a net clearance convergence diagram in one embodiment of this application.

[0031] Figure 8 This is a diagram showing the displacement trend of the tunnel face in one embodiment of this application.

[0032] In the above figures, 1 is the pre-embedded steel ring for the tunnel entrance, 2 is the rubber sealing plate, 3 is the fixed steel ring, 31 is the upper split ring, 311 is the arc section, 312 is the supporting horizontal column, 313 is the vertical column, 314 is the inclined column, 32 is the lower split ring, 33 is the left split ring, 34 is the right split ring, 35 is the horizontal support column, 36 is the vertical support column, and 4 is the hinge plate. Detailed Implementation

[0033] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first," "second," etc., used in this application are used to distinguish the described objects and do not have any sequential or technical meaning. And the terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages).

[0034] Unless otherwise specified, the unit modules, components, equipment, tools and materials involved in the following embodiments are all conventional commercially available products.

[0035] This application provides a waterproof construction method for shield receiving in a mined tunnel, which solves the technical problem that the existing technology of directly using the water-stop structure for shield receiving in mined tunnels results in poor sealing and waterproofing, thus making it impossible to complete the shield receiving work in mined tunnels. By cooperating with the CD mined tunnel method to set up the initial support structure and remove the middle partition wall before installing the water-stop structure, the shield receiving work in mined tunnels can be realized.

[0036] The technical solution in this application embodiment is to solve the above-mentioned technical problem of poor sealing and waterproofing effect. The overall idea is as follows:

[0037] After the tunnel excavation is completed, a double-layer initial support structure is set up in the receiving section to facilitate the removal of the central diaphragm. Then, the water-stop structure is installed. This allows the installation of the water-stop structure to be completed in conjunction with the CD method, thereby ensuring the sealing and water-stopping effect of the water-stop structure.

[0038] The aforementioned water-stopping structure includes a rubber sealing plate installed on the steel ring embedded part through the mounting hole. A fixing steel ring is provided on the outside of the rubber sealing plate for fixing. Multiple hinge plates are fixed on the main structure of the portal and are connected to each other to form a ring. The fixing steel ring includes a split ring with four parts: upper, lower, left, and right. Each split ring includes an arc portion, a supporting horizontal plate supporting the arc portion and disposed between its arc segments, and a column disposed between the supporting horizontal plate and the arc portion. By setting the fixing steel ring as a composite steel ring, it is easy to install and disassemble, and the sealing and waterproofing effect is improved, effectively solving the problem.

[0039] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] This example discloses a waterproofing construction method for shield tunneling receivers in a mined tunnel, the process of which is as follows: Figure 1 As shown, the main steps include the following:

[0042] (1) After the tunnel excavation is completed, a double-layer initial support structure is constructed in the shield receiving section of the tunnel, and a double-layer fiber structure is installed on the end wall for reinforcement. The double-layer initial support structure includes an arch frame, anchor rods, steel mesh and grouting structure sprayed inside it. Its function is to strengthen the support inside the tunnel and reduce the bottom settlement caused by the later removal of the partition wall.

[0043] (2) Since the construction technology of the receiving chamber tunnel is the CD method, it is necessary to remove the central diaphragm; such as Figures 5 to 8 As shown, data monitoring should be conducted at the arch crown settlement point, clearance convergence point, surface settlement point, and working face monitoring point before and after the central diaphragm is demolished. Once all data are stable, the central diaphragm can be demolished using an excavator. During demolition, monitoring of surface settlement point, arch crown settlement point, clearance convergence point, and working face displacement should continue. For example,... Figure 5 As shown, the control value for the surface settlement point is ±30, as... Figure 6 As shown, the control value for the settlement point of the arch is ±20, as... Figure 7 As shown, the net clearance convergence control value is ±10, as... Figure 8As shown, the changes in the displacement monitoring points at the tunnel face tend to be stable. During the construction process, there were slight changes in the settlement points at the arch crown, the convergence of the clearance, and the displacement at the tunnel face, but all were within the warning values. There were slight settlements at the temporary surface points. After observation, all monitoring data have become stable. It is concluded that the deformation inside and outside the tunnel shows a convergence trend, and the differential settlement at each monitoring point is relatively small. It is determined that the tunnel and surrounding buildings (structures) are safe and stable during the dismantling of the supports.

[0044] (3) A steel pipe frame is set at the end wall of the shield receiving section to facilitate the binding of reinforcing bars and the installation of formwork, and installation holes and steel ring embedded parts are reserved on the formwork;

[0045] (4) Pour concrete. The concrete strength is C35 concrete according to the construction requirements and will be used as the main body in the later stage.

[0046] (5) Remove the formwork inside the opening and install the water-stop structure through the mounting holes and steel ring embedded parts. Figure 2 As shown, the water-stopping structure includes a rubber sealing plate 2 installed on the steel ring embedded part through the mounting hole. A fixing steel ring 3 for fixing is provided on the outside of the rubber sealing plate 2. Multiple hinge plates 4 fixed to the main structure of the portal are provided on the outside of the fixing steel ring 3, and the multiple hinge plates 4 are interconnected to form a ring. Figure 3 As shown, the fixing steel ring 3 comprises four separate rings: an upper separate ring 31, a lower separate ring 32, a left separate ring 33, and a right separate ring 34. Figure 4 As shown, the split ring includes an arc portion 311, a supporting horizontal column 312 supporting the arc portion 311 and disposed between its arcs, and a column disposed between the supporting horizontal column 312 and the arc portion 311. A vertical support column 36 is disposed between the upper split ring 31 and the lower split ring 32, and a horizontal support column 35 is disposed between the left split ring 33 and the right split ring 34. The vertical support column 36 and the horizontal support column 35 serve as temporary supports and can be disassembled when necessary. Furthermore, during the shield tunneling process, the rubber sealing plate 2 is tightly attached to the outer wall of the shield to form a water-stopping seal. At this time, after the hinge plate 4 flips over, it will press against the rubber sealing plate 2 to prevent the rubber sealing plate 2 from flipping in reverse due to excessive water and soil pressure in front. Under the action of water and soil pressure in front, the rubber sealing plate 2 will be tightly pressed against the hinge plate 4, and this sealing state is relatively reliable. Theoretically speaking, the greater the inner edge elongation of the rubber sealing plate 2, the closer it fits to the tunnel boring machine, and the better the sealing and water-stopping effect.

[0047] The column includes an inclined column 314 and an upright column 313, and the supporting horizontal column 312 is detachably mounted on the arc portion 311. The column is detachably mounted between the supporting horizontal column 312 and the arc portion 311. Both the supporting horizontal column 312 and the column can be disassembled when needed to avoid affecting the normal shield receiving operation.

[0048] The hinge plate 4 includes a connecting part and a fixing part that are perpendicular to each other. The connecting part has bolt holes, and the fixing part has lifting rings. The hinge plate 44 is fixedly installed on the main structure of the portal frame by bolts, and a steel wire rope is threaded through the lifting rings so that the steel wire rope passes through all the hinge plates 4 and is fixed to the wall of the receiving well, thus further stabilizing the structure. A hand-operated hoist or similar tool can be used to tighten the steel wire rope. Although some preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0049] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for waterproofing shield tunneling receivers in a mined tunnel, characterized in that, Includes the following steps: (1) After the tunnel excavation is completed, a double-layer initial support structure is constructed in the shield receiving section of the tunnel chamber and a double-layer fiber structure is installed on the end wall for reinforcement; the double-layer initial support structure includes an arch frame, anchor bolts, steel mesh and a grouting structure layer sprayed inside it. (2) Dismantle the septum; (3) A steel pipe frame is set at the end wall of the shield receiving section to facilitate the binding of reinforcing bars and the installation of formwork, and installation holes and steel ring embedded parts are reserved on the formwork; (4) Pouring concrete; (5) Remove the template inside the tunnel portal and install the water-stop structure through the mounting holes and the steel ring embedded parts; in step (5), the water-stop structure includes a rubber sealing plate set on the steel ring embedded parts through the mounting holes, and a fixing steel ring is set on the outside of the rubber sealing plate for fixing, and multiple hinge plates are set on the outside of the fixing steel ring for fixing on the main structure of the tunnel portal, and the multiple hinge plates are connected to each other to form a sealing ring; the fixing steel ring includes a split ring of four parts: upper, lower, left, and right, and the split ring includes an arc part, a supporting cross column set between its arc segments to support the arc part, and a set on the... The column between the supporting horizontal column and the arc section, the column between the split rings is provided with a horizontal support column and a vertical support column, the column includes an inclined column and a vertical column, and the supporting horizontal column is detachably installed on the arc section, the column is detachably installed between the supporting horizontal column and the arc section; the hinge plate includes a connecting part and a fixing part that are perpendicular to each other, the connecting part is provided with a bolt hole, the fixing part is provided with a lifting ring, and the hinge plate is installed on the main structure of the portal by bolt connection; a steel wire rope is passed through the lifting ring and passes through all the hinge plates, and its two ends are fixed to the wall of the receiving well.

2. The waterproofing construction method for shield tunneling receivers in mined tunnels according to claim 1, characterized in that, In step (2), before breaking the central diaphragm, data monitoring should be carried out on the arch settlement, clearance convergence, surface settlement point, and working face monitoring point. After all data are stable, the central diaphragm can be broken. During the breaking, an excavator is used for chiseling.

3. The waterproofing construction method for shield tunneling receivers in mined tunnels according to claim 1, characterized in that, In step (4), the concrete strength is determined according to the construction requirements, and C35 concrete is poured and used as the main body in the later stage.

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