Prefabricated corrugated steel plate preliminary bracing structure for vertical shaft

Abstract

The utility model belongs to the technical field of tunnel engineering construction, and discloses an assembly type corrugated steel plate preliminary bracing structure for a vertical shaft, which comprises an assembly type corrugated steel plate layer and a plurality of anchor rods, the assembly type corrugated steel plate layer is formed by splicing a plurality of corrugated steel plate units, and one end of each anchor rod is fixed on surrounding rock. The other end of the anchor rod is fixedly connected with the corrugated steel plate unit, and a grouting layer is filled between the assembly type corrugated steel plate layer and the surrounding rock, so that the complex links of material field processing, layered concrete spraying and the like are reduced, and the construction process is greatly simplified; in terms of construction pollution, a large amount of dust generated by sprayed concrete is avoided, the construction environment is improved, the corrugated steel plate layer cooperates with the anchor rod, the grouting layer, the reinforcing mesh and the like to form a stable supporting system, the arc-shaped corrugated steel plate body is attached to the surrounding rock, the zinc coating enhances corrosion resistance, and the foam pad improves the durability of the structure. The tunnel supporting target which is efficient, environmentally friendly, economical, stable and reliable is achieved on the whole.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel engineering construction technical field, especially a kind of assembly type corrugated steel plate initial support structure for shaft. BACKGROUND

[0002] In the field of highway tunnel engineering construction, grid (steel) structure becomes the current widely used initial support device due to its good mechanical properties. During construction, concrete is sprayed in layers after the completion of grid (steel) erection, thereby building a composite stress system of reinforced grid (steel) and sprayed concrete. However, this method has many limitations in practical application: the construction process includes material processing, on-site assembly, layered spraying and other links, with complex procedures; sprayed concrete operation produces a large amount of dust, causing serious construction pollution; multi-link manual operation and material waiting time significantly lengthen the construction period; the construction site is dusty and narrow, with a poor working environment; the overall construction process has a low degree of mechanization and relies heavily on manual operation; in addition, the combination of material loss and labor cost makes the project cost high. With the continuous improvement of tunnel underground engineering construction scale and technical requirements, there is an urgent need to develop new support structures to break through the existing technical bottlenecks and achieve efficient, environmentally friendly and economic engineering construction.

[0003] Therefore, a kind of assembly type corrugated steel plate initial support structure for shaft is provided. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims to provide a kind of assembly type corrugated steel plate initial support structure for shaft, to solve or at least alleviate one or more of the above problems and other aspects in prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following main technical solutions:

[0006] An assembly type corrugated steel plate initial support structure for shaft includes an assembly type corrugated steel plate layer and a plurality of anchor rods. The assembly type corrugated steel plate layer is composed of a plurality of corrugated steel plate units. One end of the anchor rod is fixed to the surrounding rock, and the other end of the anchor rod is fixedly connected to the corrugated steel plate unit. A grouting layer is filled between the assembly type corrugated steel plate layer and the surrounding rock.

[0007] In the assembly type corrugated steel plate initial support structure for shaft according to the utility model, a steel mesh is arranged on the outer side of the assembly type corrugated steel plate layer.

[0008] In the assembly type corrugated steel plate initial support structure for shaft according to the utility model, the steel mesh is connected to the assembly type corrugated steel plate layer through an anchor pad.

[0009] In the utility model, the corrugated steel plate unit comprises a corrugated steel plate body, the corrugated steel plate body is arranged in an arc shape, the top and the bottom of the corrugated steel plate body are fixedly connected with transverse flanges, and the two ends of the corrugated steel plate body are fixedly connected with longitudinal flanges.

[0010] In the utility model, the adjacent two corrugated steel plate units are filled with foam pads.

[0011] In the utility model, the anchor rod is a hollow cast anchor rod.

[0012] In the utility model, the number of anchor rods arranged in each circle of the assembled corrugated steel plate layer is eighteen.

[0013] In the utility model, the corrugated steel plate body is provided with a jack hole for the anchor rod to pass through.

[0014] In the utility model, the thickness of the corrugated steel plate body is 7mm.

[0015] In the utility model, the corrugated steel plate body is provided with a galvanized layer on the surface, and the thickness of the galvanized layer is not less than 84μm.

[0016] The utility model has at least the following beneficial effects:

[0017] In terms of construction procedures, the assembled corrugated steel plate unit adopts a prefabricated splicing mode, which reduces complex links such as on-site processing of materials, layered spraying of concrete and greatly simplifies the construction process; in terms of construction pollution, a large amount of dust generated by spraying of concrete is avoided, and the construction environment is improved; in terms of construction period, the prefabricated splicing and rapid installation characteristics greatly shorten the construction time; in terms of the degree of mechanization, installation can be completed by means of hoisting equipment and other machinery, reducing the dependence on manual operation; in terms of cost, the labor input and material loss are reduced, and the engineering cost is effectively reduced. In addition, the corrugated steel plate layer, the anchor rod, the grouting layer, the steel mesh and the like work cooperatively to form a stable supporting system, the arc-shaped corrugated steel plate body is attached to the surrounding rock, the galvanized layer enhances corrosion resistance, the foam pad improves the durability of the structure, and the whole realizes the tunnel supporting goal of high efficiency, environmental protection, economy and stable reliability. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0019] Fig. 1 It is a schematic view of the sectional structure of the utility model;

[0020] Fig. 2 It is a schematic view of the sectional structure of the utility model from the top;

[0021] Fig. 3 It is a schematic view of the structure of the corrugated steel plate unit in the utility model;

[0022] Fig. 4 It is a schematic view of the structure when the corrugated steel plate unit is spliced in the utility model.

[0023] Explanation of the reference signs:

[0024] 1, corrugated steel plate unit; 101, corrugated steel plate body; 102, transverse flange; 103, longitudinal flange; 104, insertion hole; 2, grouting layer; 3, steel mesh; 4, anchor rod. DETAILED DESCRIPTION

[0025] The embodiments of the application will be described in detail below with the accompanying drawings and embodiments, so that the realization process of how the application applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented.

[0026] Please refer to Figs. 1 to 4 The embodiment of the utility model provides a kind of vertical shaft assembly type corrugated steel plate initial support structure, including assembly type corrugated steel plate layer and several anchor rods 4, assembly type corrugated steel plate layer is spliced by several corrugated steel plate units 1, one end of anchor rod 4 is fixed on surrounding rock, the other end of anchor rod 4 is fixedly connected with corrugated steel plate unit 1, and assembly type corrugated steel plate layer is filled with grouting layer 2 between surrounding rock.

[0027] Corrugated steel plate unit 1 spliced assembly type corrugated steel plate layer is formed as the main stress structure of support, uses the bending and compression resistance of corrugated shape to increase steel plate, resists surrounding rock pressure.Anchoring force is provided by the friction and adhesive force of the one end of anchor rod 4 into the interior of surrounding rock, and the other end is connected with corrugated steel plate unit 1, which tightly combines the steel plate layer with surrounding rock, so that the support structure and surrounding rock jointly act.The grouting layer 2 is filled between the steel plate layer and the surrounding rock, which enhances the compactness and integrity of the two, further improves the stability of surrounding rock, and reduces the deformation of surrounding rock.

[0028] In the embodiment, the outer side of assembly type corrugated steel plate layer is surrounded by steel mesh 3.

[0029] The steel mesh 3 is wrapped outside the assembled corrugated steel plate layer. In the later construction of sprayed concrete or other construction, the steel mesh 3 can disperse stress and prevent the surface of the concrete from cracking, and at the same time, the steel mesh 3 can work with the steel plate layer to enhance the overall strength and toughness of the supporting structure and improve the ability of the structure to resist local load and deformation.

[0030] Further, the steel mesh 3 is connected to the assembled corrugated steel plate layer through an anchor pad.

[0031] The anchor pad plays a role of force transmission and fixation, uniformly transmits the force of the steel mesh 3 to the assembled corrugated steel plate layer, ensures the firm connection between the steel mesh 3 and the steel plate layer, avoids displacement or loosening of the steel mesh 3 under stress, and guarantees the stability and reliability of the supporting structure.

[0032] In the embodiment, the corrugated steel plate unit 1 includes a corrugated steel plate body 101, the thickness of the corrugated steel plate body 101 is 7 mm, the corrugated steel plate body 101 is arranged in an arc shape, the top and bottom of the corrugated steel plate body 101 are fixedly connected with a transverse flange 102, and the two ends of the corrugated steel plate body 101 are fixedly connected with a longitudinal flange 103.

[0033] The arc-shaped corrugated steel plate body 101 matches the circular or approximately circular contour of the shaft, can better fit the surrounding rock, and uniformly bears the surrounding rock pressure. The transverse flange 102 and the longitudinal flange 103 are used for splicing between the corrugated steel plate units 1, each unit is fixed by bolt connection or the like, a continuous assembled corrugated steel plate layer is formed, construction and installation are facilitated, and the strength and sealing performance of the connection part are guaranteed.

[0034] In the embodiment, a galvanized layer is arranged on the surface of the corrugated steel plate body 101, and the thickness of the galvanized layer is not less than 84 μm.

[0035] The galvanized layer serves as a kind of anti-corrosion coating, can effectively isolate the corrugated steel plate body 101 from contact with air, water and other corrosive media, prevents rusting and corrosion of the steel plate, prolongs the service life of the supporting structure, and guarantees that the supporting structure works stably and reliably for a long time in a humid and complex underground environment.

[0036] Further, a foam pad is filled between the two adjacent corrugated steel plate units 1.

[0037] The foam pad has certain elasticity and buffering performance, is filled between the adjacent corrugated steel plate units 1, can absorb and buffer the stress generated due to deformation of the surrounding rock, temperature change and other factors, reduces the hard friction and collision between the steel plates, prevents cracks or loosening at the connection part, and improves the durability and stability of the supporting structure.

[0038] In the embodiment, the anchor rod 4 is a hollow cast anchor rod.

[0039] The hollow structure of the hollow cast anchor rod 4 facilitates grouting operation, and after the installation of the anchor rod is completed, the slurry can be injected into the surrounding rock through the hollow channel, the slurry fills the gap between the anchor rod and the surrounding rock, and the bonding force and anchoring effect of the anchor rod and the surrounding rock are enhanced, so that the anchor rod can better play the role of load transmission and surrounding rock reinforcement.

[0040] In the embodiment, the number of anchor rods 4 arranged in each ring of the assembled corrugated steel plate layer is eighteen.

[0041] The eighteen anchor rods 4 arranged in each ring are determined according to the size of the shaft, the surrounding rock condition and the load calculation, and by reasonably distributing the anchor rods 4, the load borne by the assembled corrugated steel plate layer can be uniformly transmitted to the surrounding rock, the cooperative stress of the steel plate layer and the surrounding rock is ensured, and the overall stability of the supporting structure is improved.

[0042] Further, the plug hole 104 for the anchor rod 4 to pass through is formed on the corrugated steel plate body 101.

[0043] The arrangement of the plug hole 104 enables the anchor rod 4 to accurately pass through the corrugated steel plate body 101, realizes reliable connection of the steel plate layer and the anchor rod 4, ensures that the anchoring force of the anchor rod 4 can be effectively transmitted to the steel plate layer, and facilitates installation and positioning of the anchor rod 4, thereby improving construction efficiency.

[0044] In order to facilitate understanding of the above technical scheme of the utility model, the working principle or operation mode of the utility model in the actual process will be described in detail below

[0045] Construction preparation

[0046] Prefabricated corrugated steel plate unit 1: according to the design requirements, the corrugated steel plate unit 1 composed of the corrugated steel plate body 101, the transverse flange 102 and the longitudinal flange 103 is manufactured. The thickness of the corrugated steel plate body 101 is ensured to be 7mm, the thickness of the galvanized layer on the surface is not less than 84um, and the plug hole 104 for the anchor rod 4 to pass through is reserved on the corrugated steel plate body 101. Each ring of the corrugated steel plate unit 1 is divided into six pieces, the end head is fastened by using M24 high-strength bolts, and the ring is fastened by using M20 bolts.

[0047] Prepare other materials: prepare hollow cast anchor rod 4, steel mesh 3, anchor pad, foam pad, M10 fine stone cement mortar and other materials, and check whether the specifications and quality of the materials meet the requirements.

[0048] Debugging equipment: debug the drilling machine, grouting pump, hoisting equipment and the like, and ensure normal operation of the equipment.

[0049] Anchor rod 4 drilling and installation

[0050] Drilling: Use the drilling machine on the shaft surrounding rock, according to the design requirements of each ring set 18 anchor rod 4 drilling, drilling depth to ensure the length of the anchor rod 4 reaches 3m, the hole diameter adapts to the specification of hollow cast anchor rod 4, clean the hole in the drilling process.

[0051] Install anchor rod 4: insert the hollow cast anchor rod 4 into the drilled hole, inject slurry into the hole through the hollow channel, and fix the one end of the anchor rod 4 firmly to the surrounding rock. Wait for the slurry to solidify to the design strength.

[0052] Install steel mesh 3

[0053] After the installation of the anchor rod 4 is completed and the slurry strength meets the standard, lay the steel mesh 3 on the surface of the shaft surrounding rock, making it correspond to the position of the anchor rod 4. Temporarily fix the steel mesh 3 with the anchor rod 4 by binding or welding, ensuring that the steel mesh 3 is flat and evenly covers the supporting area, providing support for the subsequent installation of the corrugated steel plate unit 1.

[0054] Install the assembled corrugated steel plate layer

[0055] Outside the hole Half-ring assembly: Outside the hole, assemble the corrugated steel plate unit 1 into a half-ring through the horizontal flange 102 and the vertical flange 103. Fill the foam pad between the flanges to seal during assembly.

[0056] Install into a ring inside the hole: Use hoisting equipment to hoist the assembled half-ring of the assembled corrugated steel plate to the bottom of the excavation shaft. Assemble the half-ring into a ring at the bottom of the shaft, with each ring width controlled at 1.5-2m. Pass the anchor rod 4 through the jack 104 on the corrugated steel plate body 101, and use the connecting piece to fix the anchor rod 4 with the corrugated steel plate unit 1, ensuring firm connection.

[0057] Install anchor pad

[0058] Put the anchor pad on the exposed end of the anchor rod 4, adjust the position of the anchor pad, and make it tightly fit the surface of the assembled corrugated steel plate layer and evenly stressed. Use the nut to tighten and fix the anchor pad with the anchor rod 4, and firmly connect the steel mesh 3, the assembled corrugated steel plate layer, and the anchor rod 4 into one through the anchor pad.

[0059] Pour the grouting layer 2

[0060] Use the grouting pump for initial support backfill grouting operation, pour M10 fine stone cement mortar into the grouting pump hopper. Turn on the grouting pump and control the grouting pressure at 0.3-0.5MPa, so that the slurry fills the gap between the assembled corrugated steel plate layer and the surrounding rock, forming the grouting layer 2. When the slurry uniformly overflows from the reserved exhaust hole, it indicates that the grouting in this part is dense, and the grouting construction of the entire supporting area is completed in turn, ensuring the formation of a stable initial support structure.

[0061] The above description shows and describes several preferred embodiments of the present application, but as before, it should be understood that the present application is not limited to the forms disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the present application concept, by the above teachings or related art or knowledge. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the claims of the present application.

Claims

1. A fabricated corrugated steel plate primary support structure for a shaft, characterized by, The assembly type corrugated steel plate layer is composed of a plurality of corrugated steel plate units (1), and a plurality of anchor rods (4) are fixed to the surrounding rock at one end and fixedly connected with the corrugated steel plate units (1) at the other end.

2. The assembled corrugated steel plate primary support structure for a shaft according to claim 1, characterized in that: The outer side of the assembly type corrugated steel plate layer is surrounded by a steel mesh (3).

3. The assembled corrugated steel plate primary support structure for a shaft according to claim 2, characterized in that: The steel mesh (3) is connected with the assembly type corrugated steel plate layer through an anchor pad.

4. The assembled corrugated steel plate primary support structure for a shaft according to claim 1, characterized in that: The corrugated steel plate unit (1) comprises a corrugated steel plate body (101), the corrugated steel plate body (101) is arranged in an arc shape, the top and bottom of the corrugated steel plate body (101) are fixedly connected with transverse flanges (102), and the two ends of the corrugated steel plate body (101) are fixedly connected with longitudinal flanges (103).

5. The assembled corrugated steel plate primary support structure for a shaft according to claim 4, characterized in that: Foam pads are filled between adjacent two corrugated steel plate units (1).

6. The assembled corrugated steel plate primary support structure for a shaft according to claim 4, characterized in that: The anchor rod (4) is a hollow cast anchor rod.

7. The assembled corrugated steel plate primary support structure for a shaft according to claim 5, characterized in that: The number of anchor rods (4) arranged per circle of the assembly type corrugated steel plate layer is eighteen.

8. The assembled corrugated steel plate primary support structure for a shaft according to claim 6, characterized in that: Holes (104) for the anchor rods (4) to pass through are formed in the corrugated steel plate body (101).

9. The assembled corrugated steel plate primary support structure for a shaft according to claim 4, characterized in that: The thickness of the corrugated steel plate body (101) is 7 mm.

10. The assembled corrugated steel plate primary support structure for a shaft according to claim 4, characterized in that: A galvanized layer is arranged on the surface of the corrugated steel plate body (101), and the thickness of the galvanized layer is not less than 84 mu m.

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