FRP-steel-concrete bolting and grouting integrated combined arch frame and construction method thereof

Abstract

The invention provides an FRP-steel-concrete bolting and grouting integrated combined arch frame and a construction method thereof, and relates to the field of roadway supporting, the combined arch frame comprises an arch frame, an anchoring structure, a hollow pressure equalizing plate and a tensioning structure; the lagging jack comprises an upper lagging jack, a middle lagging jack and a lower lagging jack, the upper lagging jack is provided with a grouting port, cross steel embedded in the upper lagging jack and the lower lagging jack is provided with a connecting column, and the middle lagging jack is provided with a connecting hole matched with the connecting column, so that the upper lagging jack is connected with the middle lagging jack, and the lower lagging jack is connected with the middle lagging jack; the cross-shaped steel is wrapped by the FRP pipe and is poured with concrete; the anchoring structure is composed of an anchor rod and a fixing plate, the fixing plate is provided with a first preformed hole, and the hollow pressure equalizing plate is provided with a second preformed hole and a grouting hole; the tensioning structure comprises a fiber rope and a tensioning buckle. Construction is convenient and fast, the supporting force of the arch frame is improved through the FRP pipe constraint cross-shaped steel concrete combination columns, the safety and stability of a roadway are improved, and the FRP pipe constraint cross-shaped steel concrete combination columns have high use value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of roadway support, in particular to a FRP-steel-concrete anchor-grouting integrated combined arch and a construction method thereof. BACKGROUND

[0002] Safety production is the first priority in the process of coal mining, and the most common support method for coal roadway is anchor rod support, anchor net support, single hydraulic prop, arch support and the like. The publication No. CN206668284U proposes a steel pipe concrete arch for roadway support, which improves the support force of the arch and the stability of the roadway by filling concrete in the steel pipe arch. In order to improve the stability and safety of the coal roadway, many scholars have proposed various support structures and construction methods. However, with the development of mining technology in recent years, the length of fully mechanized mining face is getting longer and longer, the service life of the coal roadway is also increasing, and the time of the coal roadway being disturbed by mining is also increasing. Therefore, a new type of support structure is needed to improve the safety and stability of the roadway, and to increase the service life of the roadway and ensure the safety of mine production. SUMMARY

[0003] The purpose of the present application is to provide a FRP-steel-concrete anchor-grouting integrated combined arch and a construction method thereof to solve the problems existing in the prior art.

[0004] To achieve the above purpose, the present application provides the following solutions:

[0005] The present application provides a FRP-steel-concrete anchor-grouting integrated combined arch, which comprises an arch, an anchoring structure, a hollow pressure equalizing plate, and a tensioning structure. The arch comprises an upper arch, a middle arch, and a lower arch. The upper arch is provided with a grouting port. The upper arch and the lower arch are embedded with a cross steel, which is provided with a connecting column. The middle arch is provided with a connecting hole matched with the connecting column, so that the upper arch and the middle arch are connected, and the lower arch and the middle arch are connected. The cross steel is wrapped with a FRP pipe and filled with concrete. The anchoring structure is composed of an anchor rod and a fixed plate. The fixed plate is provided with a first reserved hole. The hollow pressure equalizing plate is provided with a second reserved hole and a grouting hole. The tensioning structure comprises a fiber rope and a tensioning buckle.

[0006] Preferably, the upper arch, the middle arch, and the lower arch can be detachably formed into three independent parts.

[0007] Preferably, the hollow pressure equalizing plate is filled with foam concrete inside.

[0008] Preferably, one hollow pressure equalizing plate needs to be supported by two arches.

[0009] The application further provides a construction method of the FRP-steel-concrete combined arch support, characterized by comprising the following steps.

[0010] S1, determining the size of the required FRP-steel-concrete combined arch support through the roadway excavation section parameter and the roadway net section parameter;

[0011] S2, installing the lower arch support, fixing through the fixing plate and the anchor rod, and filling the lower part with concrete and waiting for solidification;

[0012] S3, repeating S2 at a distance of 800 mm;

[0013] S4, connecting the middle arch support with the lower arch support through the reserved connecting column and connecting hole, fixing through the fixing plate and the anchor rod, and filling the remaining part of the roadway with concrete;

[0014] S5, repeating S4 at a distance of 800 mm;

[0015] S6, first, placing the hollow uniform pressure plate on the roadway roof, connecting the two upper arch supports with the middle arch support through the reserved connecting column, and fixing through the fixing plate and the anchor rod;

[0016] S7, pouring concrete into the arch support through the grouting hole;

[0017] S8, pouring foam concrete into the hollow uniform pressure plate through the grouting hole;

[0018] S9, connecting the anchor rods of the upper arch support and the middle arch support through the fiber rope and the tension buckle, adjusting the tension buckle, and making the tension structure in a tension state.

[0019] The application has the following beneficial effects.

[0020] The arch support of the application is constrained by the FRP fiber reinforced composite material, the FRP is corrosion resistant and aging resistant, the support strength of the arch support is improved, and the service life of the arch support is prolonged; the hollow uniform pressure plate is installed above the arch support, the stress of the upper arch support is uniform, and the support strength is improved; the tension structure is installed on the anchor rods of the upper arch support and the middle arch support, a triangular structure is formed in the stress process, the anchor rods interact with each other, and the stability of the arch support is improved; the strength of the arch support of the application is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 is a whole structure front view after construction of the present application;

[0023] Figure 2 is a simple space structure schematic diagram of the present application;

[0024] Figure 3 is a hollow equalizing plate schematic diagram of the present application;

[0025] Figure 4 is a segmented schematic diagram of the arch frame of the present application;

[0026] Figure 5 is a sectional view of the arch frame of the present application;

[0027] Figure 6 is a fixed plate schematic diagram of the present application;

[0028] Figure 7 is a tensioning buckle schematic diagram of the present application.

[0029] In the figure: 1-anchor rod; 2-roadway; 3-hollow equalizing plate; 31-foamed concrete; 32-second reserved hole; 33-annular grouting hole; 4-arch frame; 41-upper arch frame; 42-middle arch frame; 43-lower arch frame; 44-FRP pipe; 45-cross steel; 46-concrete; 47-connection hole; 48-connection column; 5-annular grouting hole; 6-fixed plate; 61-first reserved hole; 7-concrete; 8-tensioning buckle; 9-fiber rope. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0032] Reference is made to Figures 1-7As shown, the embodiment provides a FRP-steel-concrete anchor injection integrated combined arch, which comprises: an arch 4, an anchoring structure, a hollow equalizing plate 3, and a tensioning structure; the arch 4 comprises an upper arch 41, a middle arch 42, and a lower arch 43, the upper arch 41, the middle arch 42, and the lower arch 43 can be detachably formed into three independent parts, the upper arch 41 is provided with a grouting port 5, the upper arch 41 and the lower arch 43 are provided with a connecting column 48 on an embedded cross steel 45, the middle arch 42 is provided with a connecting hole 47 matched with the connecting column 48, so that the upper arch 41 is connected with the middle arch 42, and the lower arch 43 is connected with the middle arch 42; the cross steel 45 is wrapped by an FRP pipe 44 and filled with concrete 46; the anchoring structure is composed of an anchor rod 1 and a fixed plate 6, the fixed plate 6 is provided with a first reserved hole 61, the hollow equalizing plate 3 is provided with a second reserved hole 32 and a grouting hole 33, and the inside of the hollow equalizing plate 3 is filled with foam concrete 31; the tensioning structure comprises a fiber rope 9 and a tensioning buckle 8; one hollow equalizing plate 3 needs to be supported by two arches 4.

[0033] The application also provides a construction method of the FRP-steel-concrete anchor injection integrated combined arch, which is characterized by comprising the following steps.

[0034] S1, the size of the FRP-steel-concrete anchor injection integrated combined arch is determined by the tunnel 2 excavation section parameters and the tunnel net section parameters;

[0035] S2, the lower arch 43 is installed and fixed by the fixed plate 6 and the anchor rod 1, and the lower part is filled with concrete 7 and waits for solidification;

[0036] S3, S2 is repeated at a distance of 800 mm;

[0037] S4, the middle arch 42 is connected with the lower arch 43 through the connecting column 48 and the connecting hole 47, and the remaining part of the tunnel 2 is filled with concrete 7 by fixing the fixed plate 6 and the anchor rod 1;

[0038] S5, S4 is repeated at a distance of 800 mm;

[0039] S6, the hollow equalizing plate 3 is first placed on the tunnel 2 roof, and the two upper arches 41 are connected with the middle arch 42 through the connecting column 48, and are fixed by the fixed plate 6 and the anchor rod 1;

[0040] S7, the arch 4 is filled with concrete 7 through the grouting port 5;

[0041] S8, the hollow equalizing plate 3 is filled with foam concrete 31 through the grouting hole 33;

[0042] S9, the anchor rod 1 of the upper arch 41 and the middle arch 42 is connected through the fiber rope 9 and the tension buckle 8, the tension buckle 8 is adjusted, and the tension structure is in a tension state.

[0043] The principles and implementation manners of the present application are described by applying specific examples in the present application, and the above example description is only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the field, according to the idea of the present application, there will be changes in the specific implementation manner and application range. In conclusion, the content of the present description should not be understood as a limitation on the present application.

Claims

1. A composite arch frame consisting of FRP-steel-concrete anchorage, characterized in that: The utility model relates to a FRP-steel-concrete anchor injection integrated combined arch frame, which comprises an arch frame, an anchoring structure, a hollow pressure equalizing plate and a tensioning structure.

2. The FRP-steel-concrete anchored and grouted integrated composite arch brace according to claim 1, characterized in that: The upper arch frame, the middle arch frame and the lower arch frame can be detached into three independent parts.

3. The FRP-steel-concrete anchored and grouted integrated composite arch brace according to claim 1, characterized in that: The hollow pressure equalizing plate is filled with foam concrete.

4. The FRP-steel-concrete anchored and grouted integrated composite arch brace according to claim 1, characterized in that: One hollow pressure equalizing plate is supported by two arch frames.

5. The construction method of the FRP-steel-concrete anchored and grouted integrated composite arch support according to claim 1, characterized in that: The utility model comprises the following steps: S1, determine the size of the FRP-steel-concrete anchor injection integrated combined arch frame according to the tunnel excavation section parameters and the tunnel net section parameters; S2, install the lower arch frame, fix it by the fixed plate and the anchor rod, fill the lower part with concrete and wait for solidification; S3, repeat S2 at a distance of 800 mm; S4, connect the middle arch frame and the lower arch frame by the connecting column and the connecting hole, fix them by the fixed plate and the anchor rod, and fill the remaining part of the tunnel with concrete; S5, repeat S4 at a distance of 800 mm; S6, place the hollow pressure equalizing plate on the tunnel roof, connect the upper arch frame and the middle arch frame by the connecting column, and fix them by the fixed plate and the anchor rod; S7, inject concrete into the arch frame through the grouting hole; S8, inject foam concrete into the hollow pressure equalizing plate through the grouting hole; S9, connect the anchor rods of the upper arch frame and the middle arch frame by the fiber rope and the tensioning buckle, adjust the tensioning buckle, and make the tensioning structure in a tensioned state.

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