A method for constructing a tunnel cross trench

Abstract

This application belongs to the field of tunnel construction technology, specifically providing a method for constructing a tunnel cross trench. The method involves excavating a cross trench in the area to be poured on the tunnel floor, perpendicular to the tunnel's extension direction; pre-reserving a slot at the upper end of the cross trench, extending along its length; laying a baffle in the slot, the upper end of which blocks the upper opening of the cross trench; ensuring the upper surface of the baffle is higher than the tunnel floor by a predetermined dimension; pouring concrete to construct the tunnel floor, forming a road layer; removing the road layer above the baffle to expose the baffle; and removing the baffle to expose the cross trench. After the cross trench is exposed, the inner surface of the cross trench is coated with concrete grout. The structural strength of the slot is reinforced by applying concrete grout after the cross trench is exposed. After the slot is reinforced with concrete grout, a grating plate is filled into the slot. After excavating the cross trench, a water channel is excavated on the tunnel floor.

Description

Technical Field

[0001] This application belongs to the field of tunnel construction technology, and specifically provides a method for constructing a tunnel cross trench. Background Technology

[0002] With the rapid development of modern cities, more and more underpasses are being built due to limitations in development space, urban planning, and landscape environment. Setting up rainwater interception ditches at the tunnel entrances prevents rainwater from entering the tunnel, which not only follows the principle of "high water high drainage, low water low drainage" but also reduces the possibility of the lowest point of the tunnel being flooded during heavy rain, thus ensuring the safety of tunnel operation.

[0003] To prevent rainwater from entering the tunnel, a common practice in engineering is to install rainwater interception ditches at the tunnel entrance. The typical method for installing interception ditches is to install rainwater grates on the completed road surface and fix them with ordinary bolts.

[0004] The inventors learned that tunnel cross trenches are usually excavated before the road layer at the bottom of the tunnel is poured. However, after the tunnel cross trench is excavated, the pouring of tunnel concrete will be interrupted at the tunnel cross trench, affecting the efficiency of tunnel concrete pouring. Summary of the Invention

[0005] The purpose of this invention is to provide a method for constructing a tunnel cross trench, so as to at least solve one of the above-mentioned technical problems.

[0006] To address the aforementioned problems in the prior art, one or more embodiments of this application provide a method for constructing a tunnel cross trench, comprising the following steps:

[0007] A cross trench is excavated in the area to be poured at the bottom of the tunnel, with the cross trench perpendicular to the direction of tunnel extension.

[0008] A groove is reserved at the upper end of the transverse trench, and the groove extends along the length of the transverse trench.

[0009] A baffle is laid in the trench, and the upper end of the baffle blocks the upper opening of the cross trench; and the upper surface of the baffle is made to be higher than the bottom surface of the tunnel by a certain amount.

[0010] The bottom surface of the tunnel is constructed by pouring concrete to form the road layer;

[0011] Remove the road layer above the barrier to expose the barrier;

[0012] Remove the barriers to expose the cross trench.

[0013] Furthermore, after the cross trench is exposed, concrete grout is applied to the inner surface of the cross trench.

[0014] Furthermore, after the cross-section trench is exposed, the structural strength of the trench opening is reinforced by applying concrete grout.

[0015] Furthermore, after the groove is reinforced with concrete grout, a grating plate is filled into the groove.

[0016] Furthermore, after excavating the cross trench, a water channel is excavated at the bottom of the tunnel, which is connected to the cross trench and to the external drainage facilities.

[0017] Furthermore, after the road layer is poured, an asphalt layer is poured on the surface of the road layer.

[0018] Furthermore, before the baffle is installed in the trench, geotextile is laid in the trench, with the geotextile positioned between the baffle and the trench.

[0019] The beneficial effects of one or more of the above technical solutions:

[0020] In this scheme, after excavating the tunnel cross trench, baffles are filled at the cross trench. The presence of the baffles temporarily seals the tunnel cross trench, ensuring that it does not affect the concrete pouring of the road layer. After the concrete road layer is poured, the surface of the cross trench can be repaired with concrete grout, effectively improving the tunnel construction efficiency. Attached Figure Description

[0021] The following description refers to the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the construction process in an embodiment of the present invention;

[0023] List of reference numerals in the attached drawings: 1. Foundation; 2. External support; 3. First reinforcing bar segment; 4. External mold; 41. First external mold segment; 42. Second external mold segment; 43. Third external mold segment; 44. Fourth external mold segment; 5. Internal mold; 51. First internal mold segment; 52. Second internal mold segment; 53. Third internal mold segment; 54. Fourth internal mold segment; 6. Second reinforcing bar segment; 7. Inner ring plate; 8. Outer ring plate; 9. Hydraulic cylinder; 10. Lifting base plate; 11. Ladder cage. Detailed Implementation

[0024] Those skilled in the art should understand that the embodiments described below are merely preferred embodiments of this application and do not imply that this application can only be implemented through these preferred embodiments. These preferred embodiments are merely used to explain the technical principles of this application and are not intended to limit the scope of protection of this application. Based on the preferred embodiments provided in this application, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of this application.

[0025] It should be noted that in the description of this application, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] like Figure 1 This embodiment provides a method for constructing a tunnel cross trench, including the following steps:

[0028] A cross trench is excavated in the area to be poured at the bottom of the tunnel, with the cross trench perpendicular to the direction of tunnel extension.

[0029] A groove is reserved at the upper end of the transverse trench, and the groove extends along the length of the transverse trench.

[0030] A baffle is laid in the trench, and the upper end of the baffle blocks the upper opening of the cross trench; and the upper surface of the baffle is made to be higher than the bottom surface of the tunnel by a certain amount.

[0031] The bottom surface of the tunnel is constructed by pouring concrete to form the road layer;

[0032] Remove the road layer above the barrier to expose the barrier;

[0033] Remove the barriers to expose the cross trench.

[0034] In this embodiment, after the cross trench is exposed, concrete grout is applied to the inner surface of the cross trench.

[0035] In this embodiment, the structural strength of the trench opening is reinforced by applying concrete grout after the cross trench is exposed.

[0036] In this embodiment, after the groove is reinforced with concrete grout, a grating plate is filled into the groove.

[0037] In this embodiment, after excavating the cross trench, a water trough is excavated at the bottom of the tunnel. The water trough is connected to the cross trench and to the external drainage facilities.

[0038] In this embodiment, after the road layer is poured, an asphalt layer is poured on the surface of the road layer.

[0039] In this embodiment, before the baffle is installed at the groove opening, a geotextile is laid at the groove opening, with the geotextile positioned between the baffle and the groove opening.

[0040] In this embodiment, after excavating the tunnel cross trench, baffles are filled at the cross trench. The presence of the baffles temporarily seals the tunnel cross trench, ensuring that it does not affect the concrete pouring of the road layer. After the concrete road layer is poured, the surface of the cross trench can be reused to finish the surface, effectively improving the tunnel construction efficiency.

[0041] The technical solutions of this application have been described in conjunction with the preferred embodiments above. However, it will be readily understood by those skilled in the art that the scope of protection of this application is not limited to the above preferred embodiments. Without departing from the technical principles of this application, those skilled in the art can disassemble and combine the technical solutions in the above preferred embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this application will fall within the scope of protection of this application.

Claims

1. A method for constructing a tunnel cross trench, characterized in that, Includes the following steps: A cross trench is excavated in the area to be poured at the bottom of the tunnel, with the cross trench perpendicular to the direction of tunnel extension. A groove is reserved at the upper end of the transverse trench, and the groove extends along the length of the transverse trench. A baffle is laid in the trench, and the upper end of the baffle blocks the upper opening of the cross trench; and the upper surface of the baffle is made to be higher than the bottom surface of the tunnel by a certain amount. The bottom surface of the tunnel is constructed by pouring concrete to form the road layer; Remove the road layer above the barrier to expose the barrier; Remove the barriers to expose the cross trench.

2. The tunnel cross-cut trench construction method according to claim 1, characterized in that, After the cross trench is exposed, concrete grout is applied to the inner surface of the cross trench.

3. The tunnel cross-cut trench construction method according to claim 1, characterized in that, After the cross trench is exposed, the structural strength of the trench opening is reinforced by applying concrete grout.

4. The tunnel cross-cut trench construction method according to claim 3, characterized in that, After the groove is reinforced with concrete grout, the groove is filled with grating.

5. The tunnel cross-cut trench construction method according to claim 1, characterized in that, After excavating the cross trench, a water channel is dug at the bottom of the tunnel. The water channel is connected to the cross trench and to the external drainage facilities.

6. The tunnel cross-cut trench construction method according to claim 1, characterized in that, After the road layer is poured, an asphalt layer is poured on the surface of the road layer.

7. The tunnel cross-cut trench construction method according to claim 1, characterized in that, Before the baffle is installed in the trench, geotextile is laid at the trench opening, with the geotextile positioned between the baffle and the trench opening.

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