Combined Support System and Technology for Urban Utility Tunnel and Shallow Subsurface Excavated Tunnel

Abstract

The present invention relates to the technical field of underground space construction, and particularly relates to a combined support system and process for an urban utility tunnel and an underground shallow-buried mined tunnel. The support system of the present invention is composed of three vertical micro steel pipe piles for support, a prefabricated and assembled advanced large pipe shed guide wall, and one horizontal advanced large pipe shed, forming an all-round support. Within the limited road red line range, an underground utility tunnel and an underground road are reasonably constructed, meeting the requirements of municipal engineering and minimizing the social impact as much as possible. The steps of the present invention are simple, highly operable, save construction space, and have remarkable economic and social benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of underground space construction, and particularly to a combined support system and process for an urban utility tunnel and an underground shallow-buried mined tunnel. Background Art

[0002] As the urban road traffic flow increases day by day, the existing road design has been difficult to meet the traffic requirements. At the same time, the pipelines required for the living and working of surrounding residents have gradually increased, resulting in dense pipeline laying under the road. How to effectively solve the problems of ground road traffic congestion and the orderly arrangement of various underground pipelines within the existing road red line is a particularly important and urgently needed major livelihood issue in the current urban road construction process.

[0003] The above problems can be solved by building a utility tunnel within the current road red line to solve the problem of underground pipeline layout, and building an underground road to solve the road traffic problem at the same time. However, the subsequent problem is how to solve the technical problems during the construction process, especially how to arrange the utility tunnel and the underground road within the limited road red line, complete the construction quickly and efficiently, minimize the occupation time of the urban road, shorten the construction period, and reduce the impact on the surrounding environment. In order to save land space and reduce the project volume, on the premise of meeting the road boundary requirements, the cross-sectional form of the underground shallow-buried mined tunnel structure can adopt a flat-top straight-wall structure form. This kind of excavation cross-section requires a strong support system, unlike the conventional tunnel structure forms such as horseshoe-shaped and circular. Not only the arch support of the tunnel but also the straight walls on both sides of the tunnel need to be supported, and comprehensive support is required for the top and the left and right sides. The most critical process of this kind of structure is: support. Solving the problem of fast and efficient support can enable smooth construction and shorten the project construction period. Summary of the Invention

[0004] The present invention provides a combined support system and process for an urban utility tunnel and an underground shallow-buried mined tunnel to solve the deficiencies of the prior art.

[0005] The present invention is realized through the following technical solutions:

[0006] A combined support system for an urban utility tunnel and an underground shallow-buried mined tunnel includes a vertical support structure, a prefabricated and assembled advanced large pipe shed guide wall, and a tunnel advanced large pipe shed; the vertical support structure includes three rows of steel pipe piles; one row of steel pipe piles outside the utility tunnel, one row of steel pipe piles between the tunnel and the utility tunnel, and one row of steel pipe piles outside the tunnel; the prefabricated and assembled advanced large pipe shed guide wall is prefabricated and processed, and the prefabricated and assembled advanced large pipe shed guide wall is connected with the steel pipe piles to form a transverse advanced large pipe shed guide wall; the tunnel advanced large pipe shed starts from the utility tunnel foundation pit and is perpendicular to the tunnel axis direction.

[0007] Further, the tunnel adopts a straight-wall flat-top structure.

[0008] Furthermore, the steel pipe piles are micro steel pipe piles.

[0009] Furthermore, the assembled advanced large pipe shed guide wall is prefabricated and processed with double - spliced I - beams and advanced pipe shed steel sleeves.

[0010] Furthermore, the assembled advanced large pipe shed guide wall is welded or bolted to the steel pipe piles.

[0011] For the above - mentioned combined support system of urban utility tunnel and shallow - buried underground excavation tunnel, its construction method includes the following steps:

[0012] (1) According to the width of the road red line, plan the layout of pipeline lines, design the design limit dimensions of the utility tunnel and the tunnel, and clarify the form of the support structure and the driving position of the vertical support structure; among them, the driving position of the vertical support structure steel pipe piles is designed in three rows, namely: one row outside the utility tunnel; one row between the tunnel and the utility tunnel; one row outside the tunnel; prefabricate and assemble the advanced large pipe shed guide wall.

[0013] (2) First, drive three rows of vertical steel pipe pile supports at one time. Close the road within the foundation pit of the utility tunnel, and keep the road above the tunnel open for traffic. After the traffic diversion of the road is completed, carry out the excavation of the utility tunnel, measure the elevation to locate the driving elevation of the large pipe shed at the tunnel vault, install the assembled advanced large pipe shed guide wall on the steel pipe piles to form a transverse advanced large pipe shed guide wall, and then drive the advanced large pipe shed of the tunnel in the direction perpendicular to the tunnel axis within the foundation pit of the utility tunnel.

[0014] (3) Carry out tunnel construction after the construction of the utility tunnel structure is completed and backfilling is completed.

[0015] As an optimal solution:

[0016] In step (2), the driving depth of the steel pipe piles between the tunnel and the utility tunnel is the deepest.

[0017] In step (2), the driving spacing of the steel pipe piles is 50 - 100 cm.

[0018] In step (3), the tunnel is constructed with a straight - wall flat - top structure.

[0019] In step (3), the adjacent part between the utility tunnel and the tunnel vault is backfilled with a lightweight concrete structure.

[0020] Within the limited road red line range, the present invention reasonably constructs an underground integrated pipe gallery and an underground road to meet the requirements of municipal engineering, improve efficiency, and minimize the impact on society. The underground road of the present invention adopts a straight wall and flat top structure form, which can save construction space and reduce workload. To ensure the safety of structural construction, the present invention adopts a support system composed of three micro steel pipe piles for vertical support, a prefabricated and assembled advanced large pipe shed guide wall, and a transverse tunnel advanced large pipe shed, which has the following advantages: 1. Using micro steel pipe piles as vertical isolation support piles to carry out vertical isolation support for the integrated pipe gallery and underground mined road, making full use of the advantages of fast construction of micro steel pipe piles, being able to adapt to rapid operation in narrow urban spaces, with fast hole forming and strong stiffness; 2. Adopting a prefabricated and assembled advanced large pipe shed guide wall, which is connected to the vertically driven micro steel pipe piles on site to quickly form a transverse advanced large pipe shed guide wall, avoiding construction steps such as on-site formwork support, embedded steel casing, concrete pouring, and waiting for the structure to gain strength in conventional construction, with fast and efficient construction; 3. Using the pipe gallery foundation pit as the pipe shed driving space for the underground mined road, and driving the advanced pipe shed horizontally in the direction perpendicular to the axial direction of the tunnel excavation, avoiding the disadvantages of driving the large pipe shed along the axial direction of the tunnel in the tunnel in conventional construction. In conventional construction, when driving the large pipe shed along the axial direction of the tunnel, according to the length of each cycle of pipe shed driving, a pipe shed working chamber is set up. When driving the pipe shed, the heading face cannot continue to be excavated, and the heading face needs to be temporarily closed for in-tunnel driving and grouting operations, which has a great impact on the normal cyclic excavation construction of the tunnel. For urban shallow-buried mined tunnels, a large number of advanced pipe shed supports are required. If the conventional method of driving the advanced large pipe shed in the tunnel is adopted, the construction progress will be seriously lagged, and it is not easy to ensure the driving angle and quality in the tunnel. However, the present invention can effectively solve the above problems by driving the advanced pipe shed horizontally using the pipe gallery foundation pit. The pipe shed can be driven in an orderly manner in advance without interfering with the excavation of the in-tunnel heading face. In addition, with the action of the transverse advanced large pipe shed guide wall, the driving angle can also be ensured. At the same time, using the excavated pipe gallery operation space to drive the transverse tunnel advanced large pipe shed saves the in-tunnel driving time, improves the driving efficiency, and ensures the driving quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention.

[0022] In the figure, 1 is the prefabricated and assembled advanced large pipe shed guide wall, 2 is the tunnel advanced large pipe shed, 3 is the steel pipe pile, 4 is the pipe gallery, 5 is the tunnel, and 6 is the road red line. DETAILED DESCRIPTION OF THE INVENTION

[0023] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of the present application fall within the protection scope of the present invention.

[0024] A combined support system for an urban integrated pipe gallery and an underground shallow buried tunnel comprises a vertical support structure, an assembled advanced large pipe shed guide wall 1 and a tunnel advanced large pipe shed 2, wherein the assembled advanced large pipe shed guide wall 1 is connected to the vertical support structure to form a horizontal advanced large pipe shed guide wall.

[0025] The vertical support structure includes three rows of steel pipe piles 3. In this embodiment, the steel pipe piles 3 are selected as micro steel pipe piles, which make full use of the advantages of micro steel pipe piles, such as fast construction, adaptability to fast operation in narrow urban spaces, fast hole formation, and strong rigidity. Micro steel pipe piles are used as vertical isolation support piles to perform vertical isolation support on the pipe gallery 4 and underground tunnel roads. The three rows of steel pipe piles 3 are: a row of steel pipe piles 3 outside the pipe gallery 4, a row of steel pipe piles 3 between the tunnel 5 and the pipe gallery 4, and a row of steel pipe piles 3 outside the tunnel 5, as shown in the attached figure. Figure 1 shown.

[0026] The assembled advanced large pipe shed guide wall 1 is prefabricated in the factory. The assembled advanced large pipe shed guide wall 1 is prefabricated with double-jointed 28 I-beams and an advanced pipe shed steel casing with a diameter of 158 mm. The steel assembled advanced large pipe shed guide wall 1 is processed in advance, and is welded or bolted to the vertically driven micro steel pipe piles on site to quickly form a horizontal advanced large pipe shed guide wall, avoiding the construction drawbacks of conventional construction, such as on-site template support, pre-buried steel casing, concrete pouring, and waiting for the structural strength before construction. The construction is fast and efficient.

[0027] The above-mentioned tunnel advance pipe shed 2 is different from the conventional tunnel advance pipe shed in the axial direction of the conventional tunnel advance pipe shed. The conventional tunnel advance pipe shed is laid along the axial direction of the tunnel 5. When the existing conventional laying method is laying the pipe shed, the face cannot continue to be excavated. The face must be temporarily closed, and the laying in the tunnel and grouting operations must be carried out, which has a great impact on the normal cycle excavation construction of the tunnel 5, and the construction progress is seriously delayed. Moreover, it is not easy to ensure the laying angle and quality in the tunnel. The tunnel advance pipe shed 2 of the present invention starts from the foundation pit of the pipe gallery 4 and is laid in the axial direction of the tunnel 5. This laying method can lay the pipe shed in advance and in an orderly manner, and does not interfere with the excavation of the face in the tunnel. In addition, with the effect of the above-mentioned horizontal advance pipe shed guide wall, the laying angle can be guaranteed.

[0028] Preferably, the tunnel 5 adopts a straight wall and flat roof structure. The straight wall and flat roof structure of the tunnel 5 can save floor space and reduce engineering workload.

[0029] There are many ways to connect the assembled advanced large pipe rack guide wall 1 and the steel pipe piles 3, and it is preferred to connect the two by welding or bolting.

[0030] The construction method of the above-mentioned urban integrated pipe gallery and underground shallow buried tunnel joint support system includes the following steps:

[0031] (1) According to the width of the road red line, plan the layout of pipeline lines, design the limiting dimensions of the utility tunnel 4 and the tunnel 5, and clarify the form of the support structure and the driving position of the support piles.

[0032] The vertical support structure adopts micro steel pipe piles. The diameter of the micro steel pipe piles is generally 108 mm, and a total of 3 rows are driven. One row is driven on the outside of the utility tunnel 4, one row is driven between the tunnel 5 and the utility tunnel 4, and one row is driven on the other side of the tunnel 5. The driving length of each row is optimized and adjusted according to the design calculation, and the driving depth of the middle row is the deepest. The driving spacing of the micro steel pipe piles along the line direction is 50 cm - 100 cm, and the vertical depth of the micro steel pipe piles generally exceeds 3 - 5 m below the structural bottom slab.

[0033] The designed bottom burial depth of the foundation pit of the utility tunnel 4 is about 10 m, and the burial depth of the tunnel 5 is generally about 8 m.

[0034] In the steel component processing factory, double - spliced I - beams and advanced pipe shed steel sleeves with a diameter of 158 mm are used to pre - process the steel pre - assembled advanced large pipe shed guide wall 1 in advance.

[0035] (2) First, drive three rows of vertical micro steel pipe pile supports at one time and promptly carry out in - pipe strata grouting. The road within the foundation pit range of the utility tunnel 4 is closed, and the road above the tunnel 5 continues to maintain traffic. After the traffic diversion is completed, first carry out the excavation of the utility tunnel 4, with flow - line operation for foundation pit excavation. After excavating to the base, clean the soil around the pipe piles, measure the elevation to locate the driving elevation of the large pipe shed at the tunnel 5 vault. After determining the elevation, install the pre - fabricated and processed pre - assembled advanced large pipe shed guide wall 1 on the vertical micro steel pipe piles, and weld or bolt the pre - assembled advanced large pipe shed guide wall 1 on - site to the vertically driven micro steel pipe piles to quickly form a transverse advanced large pipe shed guide wall.

[0036] Drive the tunnel advanced large pipe shed 2 horizontally in the foundation pit of the utility tunnel 4, that is, the driving direction of the tunnel advanced large pipe shed 2 is perpendicular to the axial direction of the tunnel 5. After driving is completed, promptly carry out grouting. Carry out the construction of the structural bottom slab, waterproofing, side wall and top slab of the utility tunnel 4, foundation pit backfilling, flow - line operation, etc.

[0037] (3) After the construction of the utility tunnel 4 structure is completed and backfilling is completed, carry out the construction of the tunnel 5. The tunnel 5 heading face should maintain a reasonable distance from the operation face of the utility tunnel 4. The tunnel 5 adopts a straight - wall flat - top structure. Since the vault and the two side walls of the tunnel 5 have been constructed with advanced pipe shed support, some advanced support measures can be optimized, which can save the construction time of advanced support. And reasonably select the construction excavation method according to the surrounding rock conditions, which greatly improves the work efficiency. The backfilling of the adjacent part between the utility tunnel 4 and the tunnel 5 vault adopts a lightweight concrete structure for backfilling to ensure dense backfilling, reduce the backfilling quality, and reduce the vault load.

[0038] The above-described embodiments are only one of the more preferred specific embodiments of the present invention, and the ordinary variations and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for a combined support system of an urban integrated utility tunnel and an underground shallow buried mined tunnel, characterized in that: Including a combined support system for an urban utility tunnel and an underground shallow buried mined tunnel, the combined support system for the urban utility tunnel and the underground shallow buried mined tunnel includes a vertical support structure, a prefabricated advanced large pipe shed guide wall (1) and a tunnel advanced large pipe shed (2); the vertical support structure includes three rows of steel pipe piles (3); one row of steel pipe piles (3) outside the utility tunnel (4), one row of steel pipe piles (3) between the tunnel (5) and the utility tunnel (4), and one row of steel pipe piles (3) outside the tunnel (5); the prefabricated advanced large pipe shed guide wall (1) is prefabricated, and the prefabricated advanced large pipe shed guide wall (1) is connected to the steel pipe piles (3) to form a transverse advanced large pipe shed guide wall; the tunnel advanced large pipe shed (2) starts from the foundation pit of the utility tunnel (4) and is perpendicular to the axial direction of the tunnel (5); the construction method of the combined support system for the urban utility tunnel and the underground shallow buried mined tunnel includes the following steps: (1) According to the width of the road red line (6), plan the layout of line pipelines, design the design limit dimensions of the utility tunnel (4) and the tunnel (5), and clarify the support structure form and the driving position of the vertical support structure; among them, the driving positions of the steel pipe piles (3) of the vertical support structure are designed in three rows, which are respectively: one row outside the utility tunnel (4); one row between the tunnel (5) and the utility tunnel (4), and one row outside the tunnel (5); prefabricate the prefabricated advanced large pipe shed guide wall (1). (2) First, drive three rows of vertical steel pipe piles (3) for support at one time. The road within the foundation pit of the utility tunnel (4) is closed, and the road above the tunnel (5) continues to be open to traffic. After the traffic diversion is completed, the utility tunnel (4) is excavated, the driving elevation of the large pipe shed at the crown of the tunnel (5) is measured and positioned, and the prefabricated advanced large pipe shed guide wall (1) is installed on the steel pipe piles (3) to form a transverse advanced large pipe shed guide wall. Then, the tunnel advanced large pipe shed (2) is driven in the axial direction of the tunnel (5) perpendicular to the foundation pit of the utility tunnel (4). (3) After the structure construction of the utility tunnel (4) is completed and the backfilling is completed, the tunnel (5) is constructed.

2. The construction method of the combined support system for urban utility tunnels and shallow buried underground mined tunnels according to claim 1, characterized in that: In the step (2), the driving depth of the steel pipe piles (3) between the tunnel (5) and the utility tunnel (4) is the deepest.

3. The construction method of the combined support system for urban utility tunnels and shallow buried underground mined tunnels according to claim 1, characterized in that: In the step (2), the driving spacing of the steel pipe piles (3) is 50 - 100 cm.

4. The construction method of the combined support system for urban utility tunnels and shallow buried underground mined tunnels according to claim 1, characterized in that: In the step (3), the tunnel (5) is constructed using a straight wall and flat top structure.

5. The construction method of the combined support system for urban utility tunnels and shallow buried underground mined tunnels according to claim 1, characterized in that: In the step (3), the adjacent part of the crown of the utility tunnel (4) and the tunnel (5) is backfilled using a lightweight concrete structure.

6. The construction method of the combined support system for urban utility tunnels and shallow buried underground mined tunnels according to claim 1, characterized in that: The steel pipe piles (3) are micro steel pipe piles.

7. The construction method of the combined support system for urban utility tunnels and shallow buried underground excavation tunnels according to claim 1, characterized in that: The prefabricated advanced large pipe shed guide wall (1) is prefabricated using double - spliced I - beams and advanced pipe shed steel sleeves.

8. The construction method of the combined support system for urban utility tunnels and shallow buried underground mined tunnels according to claim 1, characterized in that: The prefabricated advanced large pipe shed guide wall (1) is welded or bolted to the steel pipe piles (3).

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