A method of constructing a ground utility tunnel arranged in a superimposed manner

Abstract

A method for constructing a ground comprehensive pipe trench structure arranged in an up-down overlapping manner, characterized in that it comprises two up-down channels, wherein the ground of the upper channel is openable for construction and maintenance, and the lower channel enters the underground for maintenance through a stepped working well of the pipe trench side well mouth offset from the pipe trench axis.

Description

Technical Field

[0001] In the field of municipal engineering, this involves the construction methods of integrated utility tunnels. Background Technology

[0002] In the field of municipal engineering, various pipelines need to be laid along roads. Regulations impose numerous restrictions on underground pipeline installation, not only on horizontal safety distances and crossing clearances, but also stipulating that pipelines cannot overlap vertically. To address the issue of numerous overlapping pipelines, integrated utility trenches or utility tunnels have emerged. Conventional integrated utility trenches, such as the integrated utility trench structure used in the ground-level roadbed of urban rail transit engineering sections (publication number CN103469816A) and the multi-layered seepage-proof integrated utility trench (publication number CN222332769U), or utility tunnels such as those in the National Building Standard Design Atlas "General Design and Illustrations of Integrated Utility Tunnel Engineering" (17GL101), all have pedestrian maintenance access points. These are large in size, require high investment, and cannot be implemented in narrow passages. Summary of the Invention

[0003] The technical problem to be solved by the present invention is a method for constructing ground-based integrated pipe trenches with overlapping vertical arrangements. This method is mainly used in narrow passages such as mountainous rural roads and densely built-up urban areas, which is easy to maintain, reduces land occupation, and saves investment.

[0004] In rural roads, mountain roads, or densely built-up urban areas, various pipelines need to be laid in narrow passages. Each pipeline must maintain horizontal and vertical safety distances. Furthermore, Article 4.1.6 of the "Code for Comprehensive Planning of Urban Engineering Pipelines" (GB 50289-2016) stipulates that pipelines must not be laid in parallel or overlapping directions vertically. This invention draws on cable duct and integrated utility tunnel technologies. For cable duct technology, refer to "Specification for Laying Cross-linked Polyethylene Insulated Power Cables with Rated Voltage of 66kV~220kV Part 2: Duct Laying" (DL / T 5744.2-2016). Typically, cable ducts must be deeply buried, and the space above them cannot be used according to regulations, resulting in insufficient space utilization. Overlapping arrangements can save land, but only integrated utility tunnel technology can be used. Integrated utility tunnels require underground pedestrian passages, leading to a large land area, unsuitability for narrow sections, and higher costs.

[0005] This invention draws on integrated utility tunnel technology, with two levels of access. The upper level is used for water, gas pipelines, or cables, which can be accessed and maintained from the ground. The lower level is generally used for fiber optic or electrical cables. There is no pedestrian access. The invention also utilizes cable ducting technology, employing a stepped working well with the wellhead offset from the channel axis for maintenance.

[0006] The working manholes for cable duct installations are typically located on the duct axis, inevitably interfering with the upper-level access road. To address this, an innovative stepped working manhole design was developed, with the manhole opening offset from the access road axis. This allows the upper-level access road to pass over the steps, while the lower part of the working manhole connects to the lower-level access road, enabling maintenance personnel to access the lower access road for construction and maintenance. The working manhole opening can be located below the road surface or in a relatively open area beside the road, or it can be cantilevered out from outside a retaining wall. The upper-level access road sometimes needs to accommodate multiple pipelines, such as water ditches and gas lines, which can be installed side-by-side with the surface accessible; alternatively, it can accommodate pipes and cables, with pipes accessible for surface maintenance and cables accessed through the working manhole for maintenance. The lower-level access road sometimes needs to accommodate power and communication lines, which can be arranged in separate layers, but all maintenance is performed within the working manhole.

[0007] Detailed Description of Embodiments: The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0008] First, a trench is constructed in the narrow passageway. The lower-level pipes are then laid using standard methods. Next, a manhole is installed at a suitable location, with an easy-to-access opening. The manhole body connects to the lower-level pipes, and the manhole steps are lower than the bottom of the upper-level passageway. The trench is backfilled to be flush with the steps, and the upper-level passageway is constructed on top of the steps. The upper-level passageway can be a modular trench or a conventional trench. (See also...) Figure 1 .

[0009] Mountain roads typically have retaining walls. To save on excavation and filling, sidewalks are rarely provided. Instead, access roads are vertically installed along the sides of the retaining walls to accommodate pipelines, and working shafts cantilever out of the retaining walls. (See also...) Figure 2 .

[0010] In densely built-up urban areas where there is nowhere else to place manholes, they can be installed on the road surface with minimal damage and manageable traffic impact. (See also...) Figure 3 .

[0011] See working well profile Figure 4 At the steps, stone slabs can be pressed against the side wall of the well to form a simple support structure, or a reinforced concrete cast-in-place structure can be used. The well opening and well body construction should conform to the conventional working well.

[0012] In the diagram: 1 Upper passage; 2 Lower passage; 3 Working shaft; 4 Retaining wall; 5 Road surface; 6 Curbstone; 7 Ladder.

[0013] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

[0014] The beneficial effects of this invention are as follows: Compared with the prior art, this invention, through a stepped working well with the wellhead offset from the channel axis, effectively solves the problem of simultaneous inspection and maintenance of upper and lower channels, eliminates the need for pedestrian access for lower channel maintenance, makes full use of the cross-sectional dimensions of the integrated utility trench, saves land, and allows for flexible arrangement of the working well location according to the site area. It can also be cantilevered outside the retaining wall to reduce land occupation, making it widely applicable to narrow passageways. Construction is convenient, and the corresponding cost is relatively low. Attached image description: Figure 1 Methods for laying out integrated utility tunnels in general scenarios Figure 2 Methods for Layout of Integrated Pipe Trench on Retaining Wall Side in Mountainous Areas Figure 3 Method for arranging wellhead using the roadway Figure 4 Cross-sectional view of the well shaft In the diagram: 1 Upper passage; 2 Lower passage; 3 Working shaft; 4 Retaining wall; 5 Road surface; 6 Curbstone; 7 Ladder.

Claims

1. A method for constructing integrated pipe trenches, characterized in that... It includes two levels of access. The upper level access can be opened at ground level for construction and maintenance, while the lower level access is accessed underground for maintenance through a working well on the side of the pipe trench.

2. The integrated pipe trench according to claim 1, characterized in that... It also includes working wells with the wellhead offset from the trench axis, the well body is equipped with steps, the bottom of the steps is connected to the lower channel, and the upper channel is arranged on the steps.

3. The integrated pipe trench according to claim 1, characterized in that... The upper channel can be multiple channels in parallel, and the lower channel can be divided into multiple channels for in-well maintenance.

4. The upper-layer parallel multi-channel according to claim 3, characterized in that... The parallel passages can also be opened for maintenance outside the ground, and maintenance can be carried out inside the working well.

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