Tunnel modularized UHPC lining structure and construction method thereof

Abstract

The invention relates to a tunnel modular UHPC lining structure and a construction method thereof.The tunnel modular UHPC lining structure comprises lining arch ribs and lining shells, the lining arch ribs are annularly arranged and longitudinally arranged in parallel, and the lining shells are located between every two longitudinally adjacent lining arch ribs; the lining arch rib comprises a plurality of sections of lining arch rib modules which are arranged in the circumferential direction, the lining shell comprises a plurality of lining shell units which are arranged in the circumferential direction, and the longitudinal ends of the lining shell units are connected to the inner sides of the lining arch rib modules in a lap joint mode and are mutually fixed through constraint fasteners. A modular structure is adopted, the problems that an existing cast-in-place technology is low in construction speed, difficult in safety control, insufficient in early-stage supporting performance, low in structural durability and the like are solved, the construction efficiency and operation safety can be remarkably improved on the premise that the stability of the tunnel lining structure is guaranteed, the structure is light, the performance is reliable, the strength is high, and the durability is good. And the influence on the lining cost is small, and the adaptability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a tunnel modular UHPC lining structure and a construction method thereof. BACKGROUND

[0002] With the rapid development of infrastructure construction, the requirements of tunnel engineering for construction efficiency, structural durability, economy, and less or unmanned construction are increasingly improved. At present, the traditional tunnel secondary lining construction process mostly adopts cast-in-situ technology, which has accumulated a lot of experience in many years of engineering practice, and has advantages such as mature and stable technology, strong adaptability to geological conditions, etc.

[0003] However, the cast-in-situ method generally faces technical problems such as long construction period, large cross-operation interference, and difficult safety control in application, and has problems such as slow development of concrete strength, low early strength, and inability to meet the demand for rapid support. In addition, the construction quality of this construction method is greatly affected by environmental factors, and is prone to problems such as cracks and leakage.

[0004] Therefore, it is urgent to develop a new type of lining structure to solve the above-mentioned problems and to propose a corresponding rapid construction method to ensure the rapid construction and safe operation of the tunnel while promoting its development towards intelligent construction. SUMMARY

[0005] The purpose of the present application is to provide a tunnel modular UHPC lining structure and a construction method thereof to at least solve the many problems existing in the existing cast-in-situ method.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] A tunnel modular UHPC lining structure is provided, which comprises lining arch ribs and lining shells, the lining arch ribs are arranged circumferentially and arranged longitudinally in parallel, and the lining shells are located between two rings of longitudinally adjacent lining arch ribs;

[0008] The lining arch rib comprises a plurality of lining arch rib modules arranged circumferentially, and the lining shell comprises a plurality of lining shell units arranged circumferentially, the longitudinal end of the lining shell unit is lapped to the inner side of the lining arch rib module, and the lining shell units are fixed to each other by a restraint fastener.

[0009] Further, the lining arch rib module and the lining shell unit are both UHPC material prefabricated parts, and the lining arch rib module is internally embedded with steel bars.

[0010] Further, the cross section of the lining arch rib module is H-shaped, and the longitudinal end of the lining shell unit is located on the lower flange of the lining arch rib module.

[0011] The constraint fastener is an L-shaped plate and has a constraint fastener bolt slot, the lining shell unit has a lining shell unit reserved bolt hole, one end of the constraint fastener is located at the bottom of the lower flange of the lining arch rib module, the other end is upwardly abutted against the lining shell unit, the lining shell unit connecting bolt is inserted into the constraint fastener bolt slot and the lining shell unit reserved bolt hole and fastened, so that the lining shell unit is fixed to the lining arch rib module.

[0012] Further, the lining arch rib module is connected in the ring direction through the lining arch rib module connecting joint arranged at the ring direction end;

[0013] The lining arch rib module connecting joint comprises a connecting steel plate, the connecting steel plate is welded to the embedded steel bar of the ring direction end of the lining arch rib module, the connecting steel plate is provided with a steel plate reserved bolt hole, when two adjacent lining arch rib modules are connected in the ring direction, the connecting steel plates of the two lining arch rib modules are butted against each other, the lining arch rib module connecting bolt is inserted into the steel plate reserved bolt holes of the two lining arch rib modules and fastened, so that the two lining arch rib modules are connected in the ring direction.

[0014] Further, the outer side surface of the lining shell unit is provided with a ring direction and longitudinal arrangement of stiffening ribs.

[0015] Further, the ring direction two side end faces of the lining shell unit are respectively provided with a female key groove and a male key groove, when two adjacent lining shell units are spliced in the ring direction, the male key groove of one lining shell unit is inserted into the female key groove of the other lining shell unit.

[0016] Further, the two lining shell units of the lining shell top are spaced apart in the ring direction by a specified distance to form a skylight for back cavity concrete pouring.

[0017] Further, the ring direction two end bottoms of the lining arch rib are provided with a lock foot anchor rod.

[0018] On the other hand, a construction method of the tunnel modular UHPC lining structure is provided, the method comprises:

[0019] Excavating the tunnel and performing primary support construction;

[0020] Laying drainage plates, drainage blind pipes and waterproof plates;

[0021] Drilling holes in the surrounding rock at the arch foot, installing a lock foot anchor rod and grouting;

[0022] Removing part of the surrounding rock at the arch foot and reinforcing at the base by using a cast-in-situ bored pile, the steel bar is processed into a straight hook after passing through the hole and is welded to the connecting steel plate of the ring direction end of the lining arch rib module;

[0023] Assemble the remaining lining arch rib modules from bottom to top, and form a circumferential closed lining arch rib;

[0024] Lining shell units are installed between two longitudinally adjacent ring lining arch ribs to form a lining shell, with a skylight reserved at the top.

[0025] Furthermore, the method also includes:

[0026] After installing the lining shell unit to the arch waist position, the lower part is grouted first. After forming a ring, the cavity between the lining and the surrounding rock is fully grouted through the skylight.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] This invention provides a modular UHPC lining structure for tunnels and its construction method. The modular structure overcomes the problems of slow construction speed, difficult safety control, insufficient early support performance, and low structural durability of existing cast-in-place processes. It can significantly improve construction efficiency and operational safety while ensuring the stability of the tunnel lining structure. The structure is lightweight, reliable, strong, durable, has little impact on lining cost, and is highly adaptable. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0030] Figure 1 A schematic diagram of a modular UHPC lining structure for tunnels provided in an embodiment of the present invention.

[0031] Figure 2 for Figure 1 Detailed drawing of Part A.

[0032] Figure 3 for Figure 1 Detailed diagram of Part B in the image.

[0033] Figure 4 The elevation view of the modular UHPC lining structure for tunnels provided in an embodiment of the present invention.

[0034] Figure 5 This is a structural diagram of a single-ring assembly of a lining arch rib module provided in an embodiment of the present invention.

[0035] Figure 6 This is a structural diagram of a lining shell unit provided in an embodiment of the present invention.

[0036] Figure 7 A front view of a lining shell unit provided by an embodiment of the present application.

[0037] Figure 8 A bottom view of a lining shell unit provided by an embodiment of the present application.

[0038] Figure 9 A structure diagram of a lining arch rib module connecting joint provided by an embodiment of the present application.

[0039] Figure 10 A structure diagram of a constraint fastener provided by an embodiment of the present application.

[0040] Identified in the figure are:

[0041] 1 - lining arch rib module, 2 - lining shell unit, 3 - lining arch rib module connecting joint, 4 - constraint fastener, 5 - skylight, 6 - stiffening rib, 7 - female key groove, 8 - male key groove, 9 - lining shell unit reserved bolt hole, 10 - connecting steel plate, 11 - lining arch rib module connecting bolt, 12 - steel plate reserved bolt hole, 13 - constraint fastener bolt groove, 14 - lining shell unit connecting bolt, 15 - lock foot anchor rod. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "longitudinal", "transverse", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "providing" and the like should be understood broadly, for example, it can be fixedly connected, provided, or detachably connected, provided, or integrally connected, provided. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] It should also be noted that although the order of the steps is involved in the method description, in some cases, the order can be performed in a different order from here, and should not be understood as a limitation on the order of the steps.

[0046] In the detailed description, the direction of the tunnel line is defined as the longitudinal direction, the direction perpendicular to the longitudinal direction is defined as the transverse direction, and the direction of the tunnel lining profile is defined as the circumferential direction. In addition, the side close to the surrounding rock is defined as the outer side, and the side close to the inside of the tunnel is defined as the inner side.

[0047] To improve the construction efficiency of the tunnel lining and guarantee the structural quality of the tunnel lining, the present application designs special prefabricated components based on the concept of assembly construction, thereby providing a tunnel modular UHPC lining structure. The concrete components can be prefabricated in advance, and the on-site hoisting and assembly construction can be performed. The prefabricated components are standardized and the quality is controllable, the on-site assembly construction efficiency is high, and the installation precision is high.

[0048] Specifically, as Figure 1 , the tunnel modular UHPC lining structure mainly includes a lining arch rib and a lining shell, both of which are modular structures. The lining arch rib is arranged in a circumferential direction and arranged in parallel in a longitudinal direction, and the lining shell is located between two circumferentially adjacent lining arch ribs in the longitudinal direction. The longitudinal spacing distance of the lining arch rib is the longitudinal width of the lining shell.

[0049] The lining arch rib includes a plurality of lining arch rib modules 1 arranged in a circumferential direction, which are prefabricated UHPC components. The lining arch rib module 1 has a steel bar embedded therein, which can include circumferential reinforcement and stirrups.

[0050] As Figure 5 embodiment, one ring of lining arch ribs includes five lining arch rib modules 1. In other embodiments, according to the size of the tunnel cross section and the support requirements, the lining arch rib can also be divided into different numbers of segments.

[0051] As Figure 2 and Figure 5 embodiments, the cross section of the lining arch rib module 1 is H-shaped, and the lining arch rib module 1 is connected in a circumferential direction by a lining arch rib module connecting joint 3 provided at the circumferential end, which serves as the main force skeleton of the lining structure. The lining arch rib module connecting joint 3 includes a connecting steel plate 10 welded to the embedded steel bar at the circumferential end of the lining arch rib module 1, and the connecting steel plate 10 is provided with a steel plate reserved bolt hole 12. When two circumferentially adjacent lining arch rib modules 1 are connected, as Figure 9 , the connecting steel plates 10 of the two modules are butted against each other, the lining arch rib module connecting bolt 11 is inserted into the steel plate reserved bolt holes 12 of the two modules and fastened, thereby connecting the two lining arch rib modules 1 in a circumferential direction. In other embodiments, the lining arch rib module 1 can also adopt other cross-sectional forms, such as I-shaped, rectangular, circular, etc. In the longitudinal direction, the cross-sectional form of the lining arch rib module 1 can be a straight line or a circular arc line, and when a circular arc line is adopted, it is generally arched upward.

[0052] The lining shell comprises a plurality of lining shell units 2 arranged in a ring, which are prefabricated UHPC material pieces and have a plate shell structure with a certain thickness and curvature. The outer surface of the lining shell unit 2 is also prefabricated with a ring and longitudinal stiffening ribs 6 arranged perpendicularly and crosswise, which can strengthen the support of the plate shell structure. The number and density of the stiffening ribs can be adjusted according to actual requirements to obtain higher support capacity. The number of lining shell units 2 in each ring lining shell can also be flexibly adjusted according to actual working conditions and performance requirements.

[0053] In the embodiments as shown in Figure 2 and Figure 3 , the longitudinal end of the lining shell unit 2 is lapped to the inner side of the lining arch rib module 1 and is fixed to each other by the restraint fastener 4. Specifically, when the cross section of the lining arch rib module 1 is H-shaped, the longitudinal end of the lining shell unit 2 is located on the lower flange of the lining arch rib module 1. As shown in Figure 10 , the restraint fastener 4 is an L-shaped plate and has a restraint fastener bolt slot 13. As shown in Figure 8 , the lining shell unit 2 has a lining shell unit reserved bolt hole 9. One end of the restraint fastener 4 is located at the bottom of the lower flange of the lining arch rib module 1 and is welded and fixed, and the other end is upwardly abutted against the lining shell unit 2. The lining shell unit connecting bolt 14 is inserted into the restraint fastener bolt slot 13 and the lining shell unit reserved bolt hole 9 and is fastened, so as to fix the lining shell unit 2 to the lining arch rib module 1 and limit displacement. In other embodiments, when the cross section of the lining arch rib module 1 is I-shaped, rectangular, circular, etc., one end of the restraint fastener 4 is welded to the corresponding position on the inner side of the lining arch rib module 1.

[0054] In the embodiments as shown in Figure 6 and Figure 7 , the ring two side end faces of the lining shell unit 2 are also respectively provided with a female key groove 7 and a male key groove 8, which are longitudinally arranged. When two lining shell units 2 adjacent in the ring direction are spliced, the male key groove 8 of one lining shell unit 2 is inserted into the female key groove 7 of the other lining shell unit 2, and the two are inserted and fixed. The key grooves can be engaged with each other to realize the effective connection of the lining shell units 2 in the ring direction of the tunnel cross section.

[0055] In addition, in the embodiment as shown in Figure 1 , the two lining shell units 2 on the top of the lining shell are spaced apart at a specified distance in the ring direction to form a skylight 5 for back cavity concrete pouring. The grouting operation can be appropriately delayed from the installation operation of the modular UHPC lining structure, so as to ensure the continuity of the tunnel lining construction and the stability of the engineering structure.

[0056] In the above structure, the lining arch rib module 1 and the lining shell unit 2 are both made of UHPC material, which has higher strength and durability compared with ordinary concrete. Under the same strength, the structure is light and has low carbon emissions, which is more friendly to the environment.

[0057] The construction method of the tunnel modular UHPC lining structure specifically comprises the following steps:

[0058] Step 1: Excavate the tunnel according to the design scheme, and perform primary support construction by spraying and anchoring.

[0059] Step 2: Lay drainage plates, drainage blind pipes and waterproof plates, specifically, lay the drainage plates in the ring direction of the tunnel, lay the drainage blind pipes in the longitudinal direction, and lay the waterproof plates at the construction joints of the inverted arches of the tunnel.

[0060] Step 3: As shown in the figure, Figure 4 Drill holes in the surrounding rock at the arch foot, install the locking foot anchor rod 15 and grout.

[0061] Step 4: Remove part of the surrounding rock at the arch foot, reinforce the base by using a bored pile, and process the steel bars into straight hooks after penetrating through the holes and weld them with the connecting steel plates 10 at the ring end of the lining arch rib module 1.

[0062] Step 5: Hoist the lining arch rib module 1 by mechanical equipment, assemble the remaining lining arch rib modules 1 from bottom to top, and close the ring to form the lining arch rib. When assembling, align the steel plates 10 at the ends of two lining arch rib modules 1, pass the bolts through all the bolt holes and fasten them.

[0063] Step 6: Hoist and install the lining shell unit 2 between two rings of adjacent lining arch ribs in the longitudinal direction, form the lining shell and reserve the skylight 5 at the top. The lining shell units 2 are connected through the concave-convex key grooves, and the lining arch rib module 1 and the lining shell unit 2 are fixed through the restraint fastener 4.

[0064] In the above method, after the lining shell unit 2 is installed to the position of the haunch, the lower part is grouted first, and after the ring is formed, the cavity between the lining and the surrounding rock is grouted comprehensively through the skylight 5. During the grouting process, the concrete is vibrated and compacted to make the surrounding rock and the lining closely combined and cooperatively bear.

[0065] The structure and construction method of the present application are suitable for lining support of tunnel engineering such as railway, highway, water conservancy and subway, overcome the problems of slow speed, difficult safety control and insufficient early support performance existing in cast-in-place construction, and have the advantages of modularization, prefabrication and standardization of components, assembly of lining structure along the free surface of the tunnel, high durability of the structure, high level of construction mechanization, and high efficiency, high quality and high strength technical effect. The construction efficiency and operation safety can be significantly improved under the premise of ensuring the stability of the tunnel lining structure, the structure is light and reliable in performance, has little influence on the cost of the lining, and has high practicality.

[0066] The above application of specific examples is used to illustrate the present application and is not used to limit the present application. According to the idea of the present application, those skilled in the art can make several simple deductions, deformations or substitutions.

Claims

1. A tunnel modular UHPC lining structure, characterized in that: the structure comprises lining arch ribs and lining shells, the lining arch ribs are arranged circumferentially and arranged longitudinally in parallel, and the lining shells are located between two longitudinally adjacent rings of the lining arch ribs; the lining arch ribs comprise circumferentially arranged lining arch rib modules (1), and the lining shells comprise circumferentially arranged lining shell units (2), the longitudinal ends of the lining shell units (2) are lapped to the inner sides of the lining arch rib modules (1) and are fixed to each other by constraint fasteners (4).

2. The tunnel modular UHPC lining structure according to claim 1, characterized in that: the lining arch rib modules (1) and the lining shell units (2) are both prefabricated UHPC materials, and the lining arch rib modules (1) are internally embedded with steel bars.

3. The tunnel modular UHPC lining structure according to claim 2, characterized in that: the cross section of the lining arch rib module (1) is H-shaped, and the longitudinal ends of the lining shell unit (2) are located on the lower flange of the lining arch rib module (1); the constraint fastener (4) is an L-shaped plate with a constraint fastener bolt slot (13), the lining shell unit (2) is provided with a lining shell unit reserved bolt hole (9), one end of the constraint fastener (4) is located at the bottom of the lower flange of the lining arch rib module (1), the other end is upwardly abutted against the lining shell unit (2), a lining shell unit connecting bolt (14) is inserted into the constraint fastener bolt slot (13) and the lining shell unit reserved bolt hole (9) and fastened, so as to fix the lining shell unit (2) to the lining arch rib module (1).

4. The tunnel modular UHPC lining structure according to claim 3, characterized in that: the lining arch rib modules (1) are circumferentially connected through lining arch rib module connecting joints (3) arranged at the circumferential ends; the lining arch rib module connecting joint (3) comprises a connecting steel plate (10) which is welded to the embedded steel bars at the circumferential ends of the lining arch rib module (1), and the connecting steel plate (10) is provided with a steel plate reserved bolt hole (12), when circumferentially adjacent two lining arch rib modules (1) are connected, the steel plate reserved bolt holes (12) of the connecting steel plates (10) of the two lining arch rib modules (1) are butted against each other, a lining arch rib module connecting bolt (11) is inserted into the steel plate reserved bolt holes (12) and fastened, so as to circumferentially connect the two lining arch rib modules (1).

5. The tunnel modular UHPC lining structure according to claim 4, characterized in that: the outer surface of the lining shell unit (2) is provided with circumferentially and longitudinally arranged stiffening ribs (6).

6. The tunnel modular UHPC lining structure according to claim 5, characterized in that: the circumferential two side end faces of the lining shell unit (2) are respectively provided with a female key groove (7) and a male key groove (8), when circumferentially adjacent two lining shell units (2) are spliced, the male key groove (8) of one lining shell unit (2) is inserted into the female key groove (7) of the other lining shell unit (2).

7. The tunnel modular UHPC lining structure according to claim 6, characterized in that: Two pieces of the lining shell units (2) at the top of the lining shell are spaced apart by a specified distance in the ring direction to form a skylight (5) for back cavity concrete pouring.

8. The tunnel modular UHPC lining structure according to claim 7, characterized in that: The bottom of the ring direction ends of the lining arch rib is provided with a lock foot anchor rod (15).

9. The construction method of the tunnel modular UHPC lining structure according to claim 8, characterized in that: The method comprises: Excavating the tunnel and carrying out primary support construction; Laying drainage plates, drainage blind pipes and waterproof plates; Drilling holes in the surrounding rock at the arch foot, installing lock foot anchor rods (15) and grouting; Removing part of the surrounding rock at the arch foot, reinforcing at the base with cast-in-place piles, and processing the steel bars into straight hooks after penetrating through the holes and welding them with the connecting steel plates (10) at the ring direction ends of the lining arch rib modules (1); Assembling the remaining lining arch rib modules (1) from bottom to top, ring direction closing to form the lining arch rib; Installing the lining shell units (2) between the two ring lining arch ribs in the longitudinal direction to form the lining shell and reserving the skylight (5) at the top.

10. The construction method of the tunnel modular UHPC lining structure according to claim 9, characterized in that: The method further comprises: After installing the lining shell units (2) to the hance position, first grouting the lower part, and then carrying out overall grouting of the cavity between the lining and the surrounding rock through the skylight (5) after the ring is closed.

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