Foam geopolymer backfill layer composite structure lining
By using a composite lining structure with foamed geopolymer backfill in shield tunnels, the problem of the tunnel drainage system being unable to cope with the surrounding water abundance was solved, the tunnel's pressure-bearing capacity was enhanced, structural deformation and cracking were reduced, maintenance costs were lowered, and construction efficiency and safety were improved.
Patent Information
- Application Number
- CN202423263596.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In shield tunnels that require resistance to ground explosions, existing drainage systems are unable to effectively cope with the surrounding water-rich conditions, causing the tunnel lining structure to bear high water pressure, making it prone to cracking and damage, posing safety hazards and incurring high maintenance costs.
The composite lining structure using foamed geopolymer backfill layer includes initial support, precast invert arch, permeable pipe network and concrete layer. It is anchored to the surrounding rock by large deformation adaptive anchor bolts. Combined with waterproof membrane and permeable pipe network, it forms an effective drainage system and enhances the bearing capacity of the lining.
It effectively reduces tunnel structural deformation and cracking, lowers maintenance costs, improves later safety, enables rapid construction, and reduces construction procedures.
Smart Images
Figure CN223523733U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to shield tunnel construction technical field especially is involved in a kind of foam geopolymer backfill layer composite structure lining. BACKGROUND
[0002] Shield method is a kind of full mechanization construction method in subsurface excavation method construction, it is to push in the shield machine in ground, through shield shell and segment support around rock to prevent collapse into tunnel, simultaneously with cutting device in excavation face front side soil excavation, through soil removal machinery to be transported outside hole, rely on jack to pressurize and push in rear portion, and assemble prefabricated concrete segment, form a kind of mechanized construction method of tunnel structure.
[0003] In the shield tunnel with anti-ground explosion requirement, backfill layer is usually arranged above the bottom plate.
[0004] At present, the drainage of tunnel is penetrated by initial support, then is guided by drainage pipe into the central water ditch of tunnel structure body, and is finally discharged outside hole.But due to surrounding water, especially in rainy season, the range of tunnel lining main structure bearing hydrostatic pressure or dynamic water pressure is relatively large, and the drainage capacity of existing drainage pipeline is limited, and water pressure is easily increased due to blockage and cannot be guided in time, which easily causes lining cracking and damage, causes tunnel to have great safety hidden danger, simultaneously increases the maintenance effort and cost of tunnel, cannot prevent karst cave from continuing development under the action of underground water, thereby affecting the later operation safety of tunnel and increasing the uneven stress effect of tunnel structure. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a kind of foam geopolymer backfill layer composite structure lining to solve the above technical problem.
[0006] The utility model provides a kind of foam geopolymer backfill layer composite structure lining, including initial support installed on surrounding rock, the bottom of initial support is provided with prefabricated inverted arch, and the prefabricated inverted arch is provided with main structure;
[0007] The initial support includes concrete layer, and the concrete layer is anchored on the surrounding rock by anchor rod;
[0008] The prefabricated inverted arch includes drainage ditch and pipeline ditch;
[0009] The main structure is composed of inner steel plate, outer steel plate and reinforced concrete between the two, foam geopolymer backfill layer is arranged between the main structure and the initial support, and water permeable pipe network that communicates with the drainage ditch is arranged in the foam geopolymer backfill layer.
[0010] Further, the concrete layer is anchored on the surrounding rock through large deformation self-adaptive anchor rods and common mortar anchor rods, and the large deformation self-adaptive anchor rods and the common mortar anchor rods are uniformly spaced.
[0011] Further, a waterproof plate is arranged between the primary support and the foam geopolymer backfill layer, and the water permeable pipe network is arranged below the waterproof plate.
[0012] Further, the water permeable pipe network comprises ring-shaped water permeable pipes and longitudinal water permeable pipes, the connecting positions of the ring-shaped water permeable pipes and the longitudinal water permeable pipes are communicated through cross joints, and the bottom ends of the ring-shaped water permeable pipes are connected with the drainage ditch through drainage pipes.
[0013] Further, the ring-shaped water permeable pipes and the longitudinal water permeable pipes are spring water permeable pipes.
[0014] Further, the inner steel plate and the outer steel plate are connected through the counter-bracing pull rod penetrating through the main body structure.
[0015] Further, an end plate for closing the reinforced concrete is arranged between the inner steel plate and the outer steel plate.
[0016] Further, a double-layer slip pipe assembly for respectively pouring the concrete of the main body structure and the foam geopolymer backfill layer is arranged on the outer steel plate.
[0017] Further, the double-layer slip pipe assembly comprises a first slip pipe and a second slip pipe, the first slip pipe extends through the outer steel plate to between the outer steel plate and the inner steel plate, and the second slip pipe extends through the main body structure to between the outer steel plate and the primary support.
[0018] Further, a water-swelling adhesive tape is arranged between adjacent prefabricated inverted arches.
[0019] The utility model enhances the pressure bearing capacity of lining, effectively reduces pressure bearing blasting, reduces structural deformation, avoids lining cracking and damage, thereby reduces maintenance cost, enhances later security. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.
[0021] Figure 1 It is the whole structure schematic diagram of the utility model;
[0022] Figure 2 The initial support and prefabricated inverted arch schematic view of the utility model;
[0023] Figure 3 The main structure installation schematic view of the utility model;
[0024] Figure 4 The construction method flow chart of the utility model;
[0025] Mark explanation:
[0026] In the drawing: 1-concrete layer, 11-large deformation self-adapting anchor rod, 12-ordinary mortar anchor rod, 13-waterproof board, 2-foamed geopolymer backfill layer, 21-circumferential water permeable pipe, 22-longitudinal water permeable pipe, 3-prefabricated inverted arch, 31-drainage ditch, 32-pipeline ditch, 33-drainage pipe, 41-reinforced concrete, 42-inside steel plate, 43-outside steel plate, 44-opposite supporting rod, 51-first lower grouting pipe, 52-second lower grouting pipe, 6-steel pipe frame; Specific implementation
[0027] The technical solutions of the utility model will be described below in conjunction with embodiments, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.
[0028] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or position relationship shown in the drawing, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.
[0029] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. 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.
[0030] Embodiment 1
[0031] As shown in Figures 1-3
[0032] A foam geopolymer backfill layer composite structure lining, comprising a primary support, a prefabricated inverted arch 3 is arranged on the driving surface at the bottom of the primary support, and a main body structure is arranged on the prefabricated inverted arch 3.
[0033] The primary support comprises a concrete layer 1, the concrete layer 1 is anchored on the surrounding rock through large deformation self-adaptive anchor rods 11 and ordinary mortar anchor rods 12, and the large deformation self-adaptive anchor rods 11 and the ordinary mortar anchor rods 12 are arranged in uniform intervals.
[0034] When the surrounding rock condition is poor, a steel arch can be arranged before the shotcrete.
[0035] A waterproof board 13 is arranged on the inner side of the primary support.
[0036] A water permeable pipe network is arranged below the waterproof board 13, the water permeable pipe network comprises ring-shaped water permeable pipes 21 and longitudinal water permeable pipes 22, and the connecting positions of the ring-shaped water permeable pipes 21 and the longitudinal water permeable pipes 22 are communicated through cross joints.
[0037] The ring-shaped water permeable pipes 21 and the longitudinal water permeable pipes 22 are spring water permeable pipes.
[0038] The ring-shaped water permeable pipes 21 are arranged in a circumferential direction along the section, and are arranged in uniform intervals along the longitudinal direction of the shield tunnel at intervals of 6m; the longitudinal water permeable pipes 22 are arranged in the longitudinal direction of the shield tunnel, and are arranged in 5 rows on the section, 1 row at the vault, 2 rows symmetrically arranged at the haunch, and 2 rows symmetrically arranged at the spring.
[0039] The prefabricated inverted arch 3 comprises a drainage ditch 31 and a pipeline ditch 32, the drainage ditch 31 is located at the middle position, and the pipeline ditch 32 is symmetrically arranged at the upper position on both sides of the drainage ditch 31.
[0040] Drainage ditch 31 both sides are provided with drainage pipe 33 extending to the outside through the precast inverted arch 3, drainage pipe 33 and the bottom end of the ring water permeable pipe 21 communication.
[0041] The precast inverted arch 3 is provided with a concrete cushion layer during field assembly, and water-swelling adhesive strips are arranged at the corresponding positions of the drainage ditch 31 and the pipeline ditch 32 between adjacent precast inverted arches 3, so as to ensure the sealing and position correspondence between the drainage ditch 31 and the pipeline ditch 32.
[0042] The main structure is composed of an inner steel plate 42, an outer steel plate 43, and a reinforced concrete 41 between the inner steel plate 42 and the outer steel plate 43. The outer steel plate 43 is 5 mm thick, and the inner steel plate 42 is 20 mm thick. In this embodiment, the reinforced concrete 41 is made of self-compacting concrete, which can self-level to a dense state without vibration.
[0043] The inner steel plate 42 and the outer steel plate 43 are connected by a bracing pull rod 44 penetrating the main structure, which ensures the stability of the two steel plates during concrete pouring and prevents deformation.
[0044] An end plate is arranged between the inner steel plate 42 and the outer steel plate 43 for closing the reinforced concrete 41.
[0045] A double-layer slip pipe assembly for pouring the main structure and the foam geopolymer backfill layer 2, respectively, is arranged on the outer steel plate 43.
[0046] In this embodiment, the double-layer slip pipe assembly has three groups, one group is arranged at the middle and top of the cross section on both sides, and additional groups can be added as needed to meet the concrete feeding height.
[0047] The double-layer slip pipe assembly includes a first slip pipe 51 and a second slip pipe 52.
[0048] The first slip pipe 51 extends through the outer steel plate 43 to the space between the outer steel plate 43 and the inner steel plate 42, and the reinforced concrete 41 is poured through the first slip pipe 51 to the space between the outer steel plate 43 and the inner steel plate 42.
[0049] The second slip pipe 52 extends through the main structure to the space between the outer steel plate 43 and the initial support, and the foam geopolymer backfill layer 2 is poured through the second slip pipe 52 to the space between the main structure and the initial support.
[0050] The foam geopolymer backfill layer 2 covers the water permeable pipe network inside.
[0051] A construction method of a foam geopolymer backfill layer composite structure lining, comprising the following steps:
[0052] S1, shield tunnel initial support and anchor rod construction: according to the design position of the anchor rod, large deformation self-adaptive anchor rod 11 and ordinary mortar anchor rod 12 are made, and initial support shotcrete is sprayed. When the surrounding rock condition is poor, a steel arch is arranged to spray concrete.
[0053] S2, precast inverted arch 3 installation and waterproof layer construction: precast inverted arch 3 is installed by mechanical lifting, 100mm thick C20 concrete cushion is arranged under precast inverted arch 3, water-swelling adhesive tape is arranged between precast inverted arch 3 and corresponding position of drainage ditch 31 and pipeline ditch 32, so as to ensure sealing and position correspondence between drainage ditch 31 and pipeline ditch 32; waterproof board 13 is arranged on the surface of initial support, water permeable pipe network is arranged under waterproof board 13, annular water permeable pipe 21 is arranged along the circumference of the section, is uniformly arranged along the longitudinal direction of the shield tunnel at intervals of 6m, longitudinal water permeable pipe 22 is arranged along the longitudinal direction of the shield tunnel, 5 are arranged on the section, one is arranged at the vault, two are symmetrically arranged at the haunch, and two are symmetrically arranged at the arch foot, cross joints are arranged at the transverse and longitudinal connection of annular water permeable pipe 21 and longitudinal water permeable pipe 22, and annular water permeable pipe 21 is finally communicated with the drainage pipe 33 of precast inverted arch 3;
[0054] S3, steel plate installation and steel mesh lacing construction of main structure: first, steel pipe frame 6 and working platform are erected on precast inverted arch 3, first ring inner side steel plate 42 with a width of 1m is assembled from inside to outside, first ring steel mesh is laced, first ring outer side steel plate 43 with a width of 1m is spliced, and supporting pull rod 44 is arranged between inner side steel plate 42 and outer side steel plate 43; the longitudinal direction of the shield tunnel is cycled to install a construction section of 12m, double-layer lower slurry pipes are arranged, and end plate on both sides is closed;
[0055] S4, pouring concrete and backfill layer 2 construction; first, main structure self-compacting concrete is poured, and first lower slurry pipe 51 is closed; after the concrete reaches 75% of the design strength, foam geopolymer backfill layer 2 material is poured, and second lower slurry pipe 52 is closed;
[0056] S5, the steel pipe frame 6 is removed, and the next cycle is entered.
[0057] The utility model enhances the pressure bearing capacity of lining, effectively reduces pressure bearing blasting, reduces structure deformation, avoids lining cracking and damage, thereby reducing maintenance cost, enhancing post-period safety; realize once formwork erection, twice pouring, effectively replace traditional construction method of twice formwork erection and twice pouring, reduce construction procedure, speed up construction progress, reduce construction cost.
[0058] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A foamed geopolymer backfill layer composite structure lining, characterised in that The primary support is installed on the surrounding rock, and the bottom of the primary support is provided with a prefabricated inverted arch, and the prefabricated inverted arch is provided with a main structure; The primary support comprises a concrete layer, and the concrete layer is anchored on the surrounding rock by anchor rods; The prefabricated inverted arch comprises a drainage ditch and a pipeline ditch; The main structure is composed of an inner steel plate, an outer steel plate and reinforced concrete between the inner steel plate and the outer steel plate, and a foam geopolymer backfill layer is arranged between the main structure and the primary support, and a water permeable pipe network is arranged in the foam geopolymer backfill layer and communicates with the drainage ditch.
2. The foamed geopolymer backfill layer composite structure lining of claim 1, wherein, The concrete layer is anchored on the surrounding rock by large deformation self-adaptive anchor rods and ordinary mortar anchor rods, and the large deformation self-adaptive anchor rods and the ordinary mortar anchor rods are uniformly and spacedly arranged.
3. The foamed geopolymer backfill layer composite structure lining of claim 1, wherein, A waterproof board is arranged between the primary support and the foam geopolymer backfill layer, and the water permeable pipe network is arranged below the waterproof board.
4. The foamed geopolymer backfill layer composite structure lining of claim 1, wherein, The water permeable pipe network comprises a circumferential water permeable pipe and a longitudinal water permeable pipe, the circumferential water permeable pipe and the longitudinal water permeable pipe are connected by a cross joint, and the bottom end of the circumferential water permeable pipe is connected with the drainage ditch by a drain pipe.
5. The foamed geopolymer backfill layer composite structure lining of claim 4, wherein, The circumferential water permeable pipe and the longitudinal water permeable pipe are both spring water permeable pipes.
6. The foamed geopolymer backfill layer composite structure lining of claim 1, wherein, The inner steel plate and the outer steel plate are connected by a brace pull rod penetrating through the main structure.
7. The foamed geopolymer backfill layer composite structure lining of claim 1, wherein, End head plates for closing the reinforced concrete are arranged between the inner steel plate and the outer steel plate.
8. The foamed geopolymer backfill layer composite structure lining of claim 1, wherein, A double-layer slip pipe assembly for respectively pouring concrete of the main structure and the foam geopolymer backfill layer is arranged on the outer steel plate.
9. The foamed geopolymer backfill layer composite structure lining of claim 8, wherein, The double-layer slip pipe assembly comprises a first slip pipe and a second slip pipe, the first slip pipe extends through the outer steel plate to between the outer steel plate and the inner steel plate, and the second slip pipe extends through the main structure to between the outer steel plate and the primary support.
10. The foamed geopolymer backfill layer composite structure lining of claim 1, wherein, A water-swelling adhesive strip is arranged between adjacent prefabricated inverted arches.