Shield tunneling under road combined with permanent and temporary pavement system

Abstract

The utility model discloses a kind of permanent and temporary combination of shield underpass road's paving system, belong to underground engineering and road construction field.The system includes steel pipe pile, concrete paving layer, reinforced concrete ribbed beam, pavement structure layer and grouting reinforcement structure.Steel pipe pile is arranged in the outside of shield tunnel structure, and pile bottom is embedded in strong weathering layer or medium weathering rock layer;Concrete paving layer is located in steel pipe pile top, including C20 concrete cushion layer and C40 special fast hard concrete layer;Reinforced concrete ribbed beam is integrally poured with concrete paving layer, and is fixed with steel pipe pile top;Pavement structure layer is constituted by multilayer asphalt concrete layer;Grouting reinforcement structure is located in the projection range of shield tunnel corresponding to paving system directly below.The system can be used as temporary road support during construction, and after construction is completed, it forms permanent road structure with pavement structure layer, without dismantling, with the advantages of high strength, high rigidity, reliable force transmission, etc., can meet the needs of shield construction and normal traffic demand.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering and road construction technology, and more specifically to a permanent and temporary paving system for shield tunneling under roads. Background Technology

[0002] With the rapid development of urban underground space, new construction projects face increasingly complex surrounding environments and geological conditions, especially in urban rail transit projects where tunnel boring machines (TBMs) need to pass through buildings, bridges, roads, and waterways. In the field of urban rail transit, the TBM construction conditions for depots or access lines are particularly stringent, such as close-range tunneling under extreme conditions like overlapping tunnels, steep longitudinal slopes, shallow overburden, and small radii.

[0003] When a tunnel boring machine (TBM) passes under a road at close range, the shallow soil cover causes significant disturbance during construction. This can easily lead to ground subsidence and traffic accidents. Furthermore, the TBM can create cavities under the road after it passes, which are prone to collapse due to subsequent soil erosion, posing a significant safety hazard.

[0004] Current technologies for reinforcing existing roads generally involve pre-grouting or temporarily laying steel plates on the ground during tunnel boring machine (TBM) passage, followed by additional grouting after the TBM has passed. However, for shallow-overburden or overlapping tunnels, the reinforcement effect is difficult to meet the dual requirements of TBM construction and normal road traffic.

[0005] For example, the "Temporary Ground Cover System for Cut-and-Cut Tunnels" patent number CN217419285U is a temporary structure that needs to be removed and the original road surface restored after construction, resulting in long road occupancy and affecting normal traffic. In the event of large-scale road collapse, the 30mm thick steel plates used have relatively low strength and rigidity, making them unable to withstand the dynamic loads of vehicles. Vertical force transmission mainly relies on assuming steel supports after grooving the original road surface. If the steel area collapses simultaneously, there is a problem of force transmission failure. Furthermore, the reinforcement range of this technology needs to consider the funnel area formed by the sinkhole, resulting in problems such as a large reinforcement range and unreliable vertical force transmission safety. Utility Model Content

[0006] The purpose of this utility model is to overcome the problems of long construction period, high cost and great interference caused by the separate construction of temporary paving system and permanent road when shield tunneling passes under the road in the prior art, and to provide a permanent and temporary combined paving system for shield tunneling under the road.

[0007] The technical solution adopted in this utility model is as follows: a permanent and temporary paving system for a shield tunnel road, comprising: multiple steel pipe piles arranged on the outside of the shield tunnel structure, with the pile bottom embedded in a strongly weathered layer or a moderately weathered rock layer; a concrete paving layer disposed on top of all the steel pipe piles; reinforced concrete ribs disposed below the concrete paving layer and fixedly connected to the top of the steel pipe piles; and a road surface structure layer laid on top of the concrete paving layer; the paving system serves as a temporary road support structure during shield tunneling construction, and together with the road surface structure layer, constitutes a permanent road structure after construction is completed.

[0008] Preferably, the horizontal clearance between the center of the steel pipe pile and the outer wall of the shield tunnel structure is greater than 1 meter.

[0009] Preferably, the verticality deviation of the steel pipe pile is less than or equal to 8 / 1000.

[0010] Preferably, the reinforced concrete rib beam and the concrete cover layer are integrally cast into a single structure.

[0011] Preferably, the pavement structure layer comprises, from bottom to top, a coarse-grained AC-25F asphalt concrete layer, a medium-grained AC-20C modified asphalt concrete layer, and a fine-grained AC-16C modified asphalt concrete layer, laid in sequence.

[0012] Preferably, the thickness of the coarse-particle AC-25F asphalt concrete layer is 80 mm, the thickness of the medium-particle AC-20C modified asphalt concrete layer is 60 mm, and the thickness of the fine-particle AC-16C modified asphalt concrete layer is 50 mm.

[0013] Preferably, the concrete overlay layer comprises a C20 concrete subbase and a C40 ultra-fast hard concrete layer poured sequentially from bottom to top.

[0014] Preferably, the thickness of the C20 concrete cushion layer is 100mm, and the thickness of the C40 ultra-fast hard concrete layer is 400mm.

[0015] Preferably, it also includes a grouting reinforcement structure, which is located directly below the paving system and corresponds to the projection range of the shield tunnel. The grouting reinforcement structure is formed by ground drilling grouting or secondary grouting inside the tunnel.

[0016] Preferably, the steel pipe pile is embedded at a depth of not less than 1 meter into the strongly weathered layer, or directly into the moderately weathered rock layer.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0018] This utility model's paving system is designed based on the requirements of permanent roads, employing reinforced concrete structures. It does not need to be dismantled after the tunnel boring machine (TBM) passes under the road, reducing procedures, improving efficiency, and avoiding the impact of temporary structure demolition and original road surface restoration on road traffic. The reinforced concrete paving layer and reinforced concrete ribs overcome the low strength and stiffness problems of traditional steel plates, enabling it to better withstand the loads of various heavy vehicles. Road vehicle loads act on the concrete paving layer and are then horizontally transferred to the reinforced concrete ribs, which in turn transfer the loads to the foundation via steel pipe piles. This force transmission system is simple, reliable, and highly safe. Furthermore, the reinforcement range does not need to consider the funnel area; the steel pipe piles only need to be placed on the outside of the tunnel structure. After the TBM passes through the risk area, grouting reinforcement structures are used to reinforce the area within the TBM tunnel projection range of the paving system, strengthening the overall integrity of the paving system and improving its stiffness and strength. Attached Figure Description

[0019] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a diagram showing the cross-sectional relationship of the tunnel in this utility model.

[0021] Figure 2 This is a schematic diagram of the longitudinal cross-sectional structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the planar top view of the structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the road surface structure layer and the concrete pavement layer of this utility model;

[0024] The markings in the diagram are as follows: 1-steel pipe pile, 2-concrete pavement layer, 3-reinforced concrete rib beam, 4-pavement structure layer, 5-shield tunnel structure, 41-coarse-grained AC-25F asphalt concrete layer, 42-medium-grained AC-20C modified asphalt concrete layer, 43-fine-grained AC-16C modified asphalt concrete layer, 21-C20 concrete subbase, 22-C40 ultra-fast hard concrete layer. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] In one embodiment of this utility model, such as Figure 1-4 As shown, this embodiment provides a permanent and temporary paving system for a shield tunnel road, comprising: multiple steel pipe piles 1, which are arranged on the outside of the shield tunnel structure 5 and have their bottoms embedded in a strongly weathered layer or a moderately weathered rock layer; a concrete paving layer 2, which is disposed on the top of all the steel pipe piles 1; reinforced concrete rib beams 3, which are disposed below the concrete paving layer 2 and are fixedly connected to the top of the steel pipe piles 1; and a road surface structure layer 4, which is laid on top of the concrete paving layer 2. The paving system serves as a temporary road support structure during shield tunneling and, after completion, together with the road surface structure layer 4, constitutes a permanent road structure.

[0028] In another embodiment of this utility model, the horizontal net distance between the center of the steel pipe pile 1 and the outer wall of the shield tunnel structure 5 is greater than 1 meter.

[0029] In another embodiment of this utility model, the verticality deviation of the steel pipe pile 1 is less than or equal to 8 / 1000.

[0030] In another embodiment of this utility model, the reinforced concrete rib beam 3 and the concrete cover layer 2 are integrally cast and formed as a whole structure.

[0031] In another embodiment of the present invention, the road structure layer 4 includes a coarse-grained AC-25F asphalt concrete layer 41, a medium-grained AC-20C modified asphalt concrete layer 42, and a fine-grained AC-16C modified asphalt concrete layer 43, which are laid in layers from bottom to top.

[0032] In another embodiment of this utility model, the thickness of the coarse-particle AC-25F asphalt concrete layer 41 is 80 mm, the thickness of the medium-particle AC-20C modified asphalt concrete layer 42 is 60 mm, and the thickness of the fine-particle AC-16C modified asphalt concrete layer 43 is 50 mm.

[0033] In another embodiment of the present invention, the concrete cover layer 2 includes a C20 concrete cushion layer 21 and a C40 ultra-fast hard concrete layer 22 poured sequentially from bottom to top.

[0034] In another embodiment of this utility model, the thickness of the C20 concrete cushion layer 21 is 100mm, and the thickness of the C40 ultra-hard concrete layer 22 is 400mm.

[0035] In another embodiment of the present invention, a grouting reinforcement structure is also included. The grouting reinforcement structure is located directly below the paving system and corresponds to the projection range of the shield tunnel. The grouting reinforcement structure is formed by ground drilling grouting or secondary grouting inside the tunnel.

[0036] In another embodiment of this utility model, the steel pipe pile 1 is embedded at a depth of not less than 1 meter into the strongly weathered layer, or directly into the moderately weathered rock layer.

[0037] The working principle of this utility model is as follows: a permanent and temporary combined paving system for shield tunneling under roads, the core of which lies in integrating temporary and permanent functions. This system is deployed within the road area above the proposed shield tunnel 5.

[0038] Steel pipe piles 1 are the main vertical load-bearing components of the system. Multiple steel pipe piles 1 are arranged in rows on both sides of the tunnel, with the horizontal clearance between their centers and the outer wall of the shield tunnel structure 5 strictly greater than 1 meter. This ensures that tunnel construction does not affect the stability of the pile foundation, and that the pile foundation construction does not damage the tunnel segments. The pile bottom must be embedded in a strongly weathered or moderately weathered rock layer with good geological conditions. The embedment depth in the strongly weathered layer should not be less than 1 meter to provide sufficient end resistance and pull-out resistance. During construction, the verticality deviation of the steel pipe piles 1 must be strictly controlled to be no greater than 8 / 1000 to ensure effective load transfer.

[0039] A concrete overlay layer 2 is poured on top of the steel pipe pile 1, forming a large-area horizontal load-bearing slab. Preferably, as shown in the attached diagram... Figure 4 As shown, the paving layer consists of two layers: the lower layer is a 100mm thick C20 concrete cushion layer 21, which serves to level and protect; the upper layer is a 400mm thick C40 ultra-fast hard concrete layer 22. The C40 concrete provides high strength, and the ultra-fast hardness is to meet the tight schedule requirements of quickly opening traffic during the tunnel boring machine construction.

[0040] The reinforced concrete rib beam 3 is a key horizontal load-bearing component. It is positioned below the concrete overlay layer 2, preferably cast integrally with the concrete overlay layer 2 to form a robust T-shaped or inverted L-shaped composite beam structure. The rib beam 3 is aligned with and securely connected to the top of the steel pipe pile 1 (usually achieved by anchoring the pile head reinforcement into the rib beam), thereby centrally transferring the vehicle load borne by the overlay layer to the steel pipe pile 1.

[0041] The pavement structure layer 4 is laid on top of the concrete overlay layer 2 and is constructed after the shield tunnel construction is completed. Together with the underlying overlay system, it forms a complete permanent road. (See attached...) Figure 4As shown, the preferred pavement structure, from bottom to top, includes: an 80mm thick coarse-grained AC-25F asphalt concrete base course 41, a 60mm thick medium-grained AC-20C modified asphalt concrete intermediate course 42, and a 50mm thick fine-grained AC-16C modified asphalt concrete surface course 43. This layered design balances load-bearing capacity, rutting resistance, durability, and driving comfort.

[0042] In addition, to further enhance the stability of the soil at the top of the tunnel and reduce the risk of long-term settlement, a grouting reinforcement structure (not shown in the figure) can be installed directly below the paving system within the projection range corresponding to the shield tunnel 5. This reinforcement zone can be formed by ground drilling grouting before shield excavation or by secondary grouting through the segment grouting holes after shield breakthrough.

[0043] Construction process summary: First, steel pipe piles 1 are constructed; then, excavation is carried out to the design elevation, and reinforced concrete rib beams 3 are constructed at the top of the piles; subsequently, concrete paving layer 2 is poured to form an integral whole with rib beam 3; the tunnel boring machine safely passes through the lower part; finally, asphalt pavement structure layer 4 is laid on the stable paving system to form a permanent road.

[0044] This invention is not only applicable to subway tunnels passing under urban roads, but also to other underground engineering projects such as utility tunnels and tunnels that pass under important facilities or roads.

[0045] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A permanent and temporary combined paving system for shield tunneling under roads, characterized in that, include: Multiple steel pipe piles (1) are arranged on the outside of the shield tunnel structure (5), and the bottom of the piles is embedded in a strongly weathered layer or a moderately weathered rock layer. A concrete overlay (2) is provided on the top of all the steel pipe piles (1); A reinforced concrete rib beam (3) is placed below the concrete cover layer (2) and fixedly connected to the top of the steel pipe pile (1); The road structure layer (4) is laid on top of the concrete overlay layer (2); The paving system serves as a temporary road support structure during shield tunneling and, after completion, together with the pavement structure layer (4), constitutes a permanent road structure.

2. The permanent and temporary combined paving system for shield tunneling under roads according to claim 1, characterized in that, The horizontal clearance between the center of the steel pipe pile (1) and the outer wall of the shield tunnel structure (5) is greater than 1 meter.

3. A permanent and temporary combined paving system for shield tunneling under roads according to claim 1 or 2, characterized in that, The verticality deviation of the steel pipe pile (1) is less than or equal to 8 / 1000.

4. A permanent and temporary combined paving system for shield tunneling under roads according to claim 1, characterized in that, The reinforced concrete rib beam (3) and the concrete cover layer (2) are integral structures cast together.

5. A permanent and temporary combined paving system for shield tunneling under roads according to claim 1, characterized in that, The road structure layer (4) includes a coarse-grained AC-25F asphalt concrete layer (41), a medium-grained AC-20C modified asphalt concrete layer (42), and a fine-grained AC-16C modified asphalt concrete layer (43) laid sequentially from bottom to top.

6. A permanent and temporary combined paving system for shield tunneling under roads according to claim 5, characterized in that, The coarse-grained AC-25F asphalt concrete layer (41) has a thickness of 80 mm, the medium-grained AC-20C modified asphalt concrete layer (42) has a thickness of 60 mm, and the fine-grained AC-16C modified asphalt concrete layer (43) has a thickness of 50 mm.

7. A permanent and temporary combined paving system for shield tunneling under roads according to claim 1, characterized in that, The concrete overlay layer (2) includes a C20 concrete cushion layer (21) and a C40 ultra-fast hard concrete layer (22) poured sequentially from bottom to top.

8. A permanent and temporary combined paving system for shield tunneling under roads according to claim 7, characterized in that, The thickness of the C20 concrete cushion layer (21) is 100 mm, and the thickness of the C40 ultra-fast hard concrete layer (22) is 400 mm.

9. A permanent and temporary combined paving system for shield tunneling under roads according to claim 1, characterized in that, It also includes a grouting reinforcement structure, which is located directly below the paving system and within the projection range of the shield tunnel structure (5). The grouting reinforcement structure is formed by ground drilling grouting or secondary grouting inside the tunnel.

10. A permanent and temporary combined paving system for shield tunneling under roads according to claim 1, characterized in that, The steel pipe pile (1) is embedded at a depth of not less than 1 meter into the strongly weathered layer at its bottom, or directly into the moderately weathered rock layer.

Images