Large section chamber composite steel arch frame spray layer-discontinuous anchor stock support structure and method

Abstract

The application belongs to the technical field of supporting structure. Disclosed is a large-section chamber composite steel arch support layer-non-continuous anchor stock supporting structure and method. The supporting structure comprises a plurality of grid arches arranged along the extension direction of the roadway, and adjacent two grid arches are connected and fixed; an anchoring assembly comprises a grouting anchoring section arranged on the inner wall of the rock stratum, a drill hole is formed in the grouting anchoring section, a first anchoring member or a second anchoring member is arranged in the drill hole, one end of the first anchoring member and the second anchoring member extends into the rock stratum, and the tray end of the first anchoring member and the second anchoring member is fixed on the side of the grid arch away from the rock stratum; a water plugging disc is fixed at the opening position of the drill hole and is used for plugging the drill hole, and the anchoring member penetrates through the water plugging disc. The application can improve the supporting effect on the roadway, improve the fixing effect on the anchor rod and the anchor cable, and avoid the water in the rock stratum from entering the roadway to affect normal construction.

Description

Technical Field

[0001] This invention belongs to the field of support structure technology, and particularly relates to a large-section chamber composite steel arch frame spray layer-discontinuous anchor support structure and method. Background Technology

[0002] When supporting large-section tunnels in semi-diaphragmatic and non-diaphragmatic extremely soft strata, the poor anchorability and injectability, coupled with the high internal water content, mean that conventional support structures cannot effectively support the tunnels. Furthermore, the anchor bolts and cables have poor fixing effect to the rock strata, and after drilling the reserved holes for anchor bolts and cables, water from the rock strata enters the reserved holes and then enters the tunnel, affecting normal construction.

[0003] Therefore, a large-section chamber composite steel arch frame sprayed layer-discontinuous anchor support structure and method are provided to solve the above problems. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a composite steel arch frame sprayed layer-discontinuous anchor support structure and method for large-section chambers, which can improve the support effect on the roadway, while also improving the fixing effect of anchor bolts and anchor cables, and preventing water from entering the roadway from the rock strata and affecting normal construction.

[0005] To achieve the above objectives, the present invention provides a large-section chamber composite steel arch frame sprayed layer-discontinuous anchor support structure, comprising:

[0006] Multiple grid arch frames are arranged along the direction of the roadway extension, and adjacent grid arch frames are connected and fixed.

[0007] An anchoring assembly includes a grouting anchoring section disposed on the inner wall of the rock stratum, wherein a borehole is provided on the grouting anchoring section, and a first anchor or a second anchor is disposed in the borehole, wherein one end of the first anchor or the second anchor extends into the rock stratum, and the tray end of the first anchor or the second anchor is fixed to the side of the grid arch away from the rock stratum.

[0008] A water-blocking plate is fixed at the borehole opening and used to block the borehole, and the anchor penetrates through the water-blocking plate.

[0009] Furthermore, the water-blocking plate includes: a plate body, fixed to the inner wall of the rock stratum;

[0010] A sealing rubber ring is disposed inside the borehole. One end of the sealing rubber ring is fixed to the water-blocking plate, and the other end of the sealing rubber ring is open. Water fills the sealing rubber ring inside the borehole, causing the sealing rubber ring to bulge and block the borehole. The first anchor and the second anchor pass through the plate and the sealing rubber ring.

[0011] Furthermore, the first anchor is an anchor rod, the second anchor is an anchor cable, and the anchor rod and the anchor cable are spaced apart.

[0012] Furthermore, two adjacent grid arch frames are fixed by a connecting rib group, and the connecting ribs in the two adjacent connecting rib groups are staggered.

[0013] Furthermore, the grid arch frame includes multiple steel reinforcement frames, and adjacent steel reinforcement frames are fixed together by connecting frames.

[0014] Furthermore, the connecting frame includes a first L-shaped steel and a second L-shaped steel, which are respectively fixed to the ends of adjacent steel reinforcement frames. The first L-shaped steel has at least one mounting groove, and the second L-shaped steel has a T-shaped mounting block that matches the mounting groove. The T-shaped mounting block is located in the mounting groove, and the first L-shaped steel and the second L-shaped steel are fixed together.

[0015] Furthermore, the steel reinforcement frame includes: four first main reinforcement bars, with rectangular ends;

[0016] Multiple stirrups are arranged along the extension direction of the first main reinforcement and are sleeved and fixed on the outside of the four first main reinforcements.

[0017] Two second main reinforcing bars are fixed to the inner wall of the stirrups and are located between the two first main reinforcing bars arranged vertically.

[0018] Furthermore, the tray end includes: a tray body, through which the anchor rod or the anchor cable is connected;

[0019] At least one connecting rib is fixed to the side of the disc body near the steel reinforcement frame, the first main reinforcement is located inside the connecting rib, and the disc body and the connecting rib are fixed to the first main reinforcement.

[0020] A method for supporting large-section chamber composite steel arch frames with sprayed coating and discontinuous anchors, used for constructing the aforementioned large-section chamber composite steel arch frame sprayed coating and discontinuous anchor support structure, includes the following construction steps:

[0021] S1. Cast the grouting anchorage section and drill holes at the grouting anchorage end;

[0022] S2. Insert the water-blocking plate into the borehole;

[0023] S3. Install the grid arch frame;

[0024] S4. Install the first and second anchors.

[0025] S5. Pour concrete to fill the grid arch frame.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] 1. Multiple grid arch frames work together to support the roadway and ensure its support effect.

[0028] 2. Grouting is performed within the rock strata to reinforce the rock strata and form a grouting anchoring section. Holes are drilled in the grouting anchoring section and a first anchor or a second anchor is inserted to improve the fixing effect between the rock strata and the first or second anchor.

[0029] 3. Install a water-blocking plate inside the borehole to seal it and prevent water from entering the roadway and affecting normal construction. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0031] Figure 1 This is a structural diagram of the support structure;

[0032] Figure 2 This is a cross-sectional view showing the connection between the grid arch and the rock strata.

[0033] Figure 3 This is a cross-sectional view showing the connection between the water-blocking plate and the rock strata.

[0034] Figure 4 This is a three-dimensional view of the connecting frame;

[0035] Figure 5 This is a schematic diagram showing the connection relationship between adjacent grid arch frames;

[0036] Among them, 1-grid arch frame, 101-first main reinforcement, 102-stirrup, 103-second main reinforcement, 104-joint connecting reinforcement, 2-drill hole, 3-rock stratum, 4-water plugging plate, 401-plate body, 402-sealing rubber ring, 5-anchor rod, 6-anchor cable, 7-connecting reinforcement, 8-connecting frame, 801-first L-shaped steel, 802-second L-shaped steel, 803-installation groove, 804-T-shaped installation block, 9-plate body, 10-connecting rib. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Reference Figures 1-5 The present invention provides a large-section chamber composite steel arch frame spray layer-discontinuous anchor support structure, comprising: multiple grid arch frames 1, arranged along the extension direction of the tunnel, and adjacent grid arch frames 1 connected and fixed.

[0040] The anchoring assembly includes a grouting anchoring section set on the inner wall of the rock stratum 3, a drilled hole 2 is provided on the grouting anchoring section, and a first anchor or a second anchor is provided in the drilled hole 2. One end of the first anchor and the second anchor extends into the rock stratum 3, and the tray end of the first anchor and the second anchor is fixed to the side of the grid arch 1 away from the rock stratum 3; a water-blocking plate 4 is fixed at the opening position of the drilled hole 2 and is used to block the drilled hole 2, and the anchor penetrates through the water-blocking plate 4.

[0041] Specifically, since the rock stratum 3 is relatively soft, grouting is performed in the area of ​​the rock stratum 3 near the roadway to form a grouting anchoring section. A borehole 2 is drilled in the grouting anchoring section and a first anchor or a second anchor is inserted. The grouting anchoring section improves the connection between the first anchor or the second anchor and the rock stratum 3. After the borehole 2 is completed, a water-blocking plate 4 is inserted into the borehole 2. The water-blocking plate 4 is used to seal the borehole 2 and ensure that the first anchor or the second anchor passes through. At the same time, the water-blocking plate 4 is a permanent installation structure.

[0042] Further optimize the plan, referring to Figure 3 The water-blocking plate 4 includes: a plate body 401, fixed to the inner wall of the rock stratum 3; a sealing rubber ring 402, set in the borehole 2, one end of the sealing rubber ring 402 is fixed to the water-blocking plate 4, the other end of the sealing rubber ring 402 is open, water in the borehole 2 fills the sealing rubber ring 402, the sealing rubber ring 402 bulges up to block the borehole 2, and the first anchor and the second anchor pass through the plate body 401 and the sealing rubber ring 402.

[0043] Specifically, after drilling is completed, the disc 401 is attached to or embedded into the inner wall of the rock layer 3 and fixed to the rock layer 3 by bolt connection. The sealing rubber ring 402 is located inside the borehole 2. When the borehole 2 is filled with water and the water pressure increases, the sealing rubber ring 402 expands under force, which can seal the gap between the disc 401 and the borehole 2, thereby improving the water blocking effect.

[0044] A through hole is reserved on the disc body 401 for the first anchor or the second anchor to pass through. During the water blocking stage, the through hole is closed by a cover. When installing the first anchor or the second anchor, the cover is opened and the first anchor or the second anchor passes through the through hole.

[0045] Further optimize the plan, referring to Figure 1The first anchor is anchor rod 5, and the second anchor is anchor cable 6, with anchor rod 5 and anchor cable 6 spaced apart.

[0046] Specifically, anchor bolts 5 and anchor cables 6 are respectively placed into different boreholes 2, and anchor bolts 5 and anchor cables 6 are set at intervals to apply prestress to the rock strata around the roadway.

[0047] Further optimize the plan, referring to Figure 5 Two adjacent grid arch frames 1 are fixed by a connecting bar group, and the connecting bars 7 in the two adjacent connecting bar groups are staggered.

[0048] Specifically, the staggered arrangement of the connecting ribs 7 improves the connection effect between adjacent grid arch frames 1.

[0049] The scheme is further optimized. The grid arch frame 1 includes multiple steel bar frames, and adjacent steel bar frames are fixed together by connecting frames 8.

[0050] The grid arch frame 1 includes a top beam section, two side column sections, and a bottom arch section. In actual construction, the grid arch frame 1 is assembled by connecting seven steel reinforcement frames end to end.

[0051] Further optimize the plan, referring to Figure 2 , Figure 4 The connecting frame 8 includes a first L-shaped steel 801 and a second L-shaped steel 802. The first L-shaped steel 801 and the second L-shaped steel 802 are respectively fixed to the ends of adjacent steel reinforcement frames. At least one mounting groove 803 is provided on the first L-shaped steel 801. A T-shaped mounting block 804 matching the mounting groove 803 is fixed on the second L-shaped steel 802. The T-shaped mounting block 804 is located in the mounting groove 803. The first L-shaped steel 801 and the second L-shaped steel 802 are fixed together.

[0052] Specifically, the first L-shaped steel 801 and the second L-shaped steel 802 are welded and fixed to achieve the connection and fixation of the two adjacent steel reinforcement frames. On this basis, T-shaped mounting blocks 804 and mounting grooves 803 are set. The T-shaped mounting blocks 804 and mounting grooves 803 are snapped together to further improve the fixing effect of the first L-shaped steel 801 and the second L-shaped steel 802. At the same time, when fixing the first L-shaped steel 801, the second L-shaped steel 802 can be positioned by the T-shaped mounting blocks 804 and mounting grooves 803. When fixing the second L-shaped steel 802, the first L-shaped steel 801 can be positioned by the T-shaped mounting blocks 804 and mounting grooves 803.

[0053] Further optimize the plan, referring to Figure 2 , Figure 5 The steel reinforcement frame includes: four first main bars 101 with rectangular ends; multiple stirrups 102 arranged along the extension direction of the first main bars 101 and fitted and fixed on the outside of the four first main bars 101; and two second main bars 103 fixed on the inner wall of the stirrups 102 and located between the two first main bars 101 arranged above and below.

[0054] Specifically, the four primary reinforcing bars 101 are matched in pairs, with the ends of the two matched primary reinforcing bars 101 bent and brought close to each other. Stirrups 102 are installed on the outside of the four primary reinforcing bars 101 to fix the four primary reinforcing bars 101. At the same time, two secondary reinforcing bars 103 are fixed on the inner wall of the stirrups 102, with the ends of the two secondary reinforcing bars 103 bent and brought close to each other.

[0055] Furthermore, refer to Figure 5 It is also equipped with a joint connecting bar 104, which is fixedly connected to the two bent sections of the first main bar 101 at both ends.

[0056] In one specific embodiment of the present invention, the main reinforcing bars are 6 threaded steel bars with a diameter of 22mm and a specification of HRB335; the stirrups are φ12mm round steel bars with a specification of HPB235, and the stirrup spacing is 200mm.

[0057] Further optimize the plan, referring to Figure 3 The tray end includes: a tray body 9, through which anchor rods 5 or anchor cables 6 are connected; at least one connecting rib 10, fixed on the side of the tray body 9 near the steel reinforcement frame, and a first main reinforcement 101 located inside the connecting rib 10, with the tray body 9 and the connecting rib 10 fixed to the first main reinforcement 101.

[0058] Specifically, the connecting rib 10 is used to install the disc body 9 on the first main rib 101, thereby improving the fixing effect between the disc body 9 and the first main rib 101. When the first main rib 101 is an arc-shaped structure, the receiving groove on the connecting rib 10 should match the bending angle of the first main rib 101 in order to accommodate the first main rib 101.

[0059] A method for supporting large-section chamber composite steel arch frames with sprayed coating and discontinuous anchors, used for constructing the aforementioned large-section chamber composite steel arch frame sprayed coating and discontinuous anchor support structure, includes the following construction steps:

[0060] S1. Pour the grouting anchor section and drill holes 2 at the grouting anchor end.

[0061] The installation positions of the first or second anchor are pre-calculated and marked. Grout is injected into the installation positions. After the grout solidifies, a grouting anchor section is formed. Then, holes are drilled in the grouting anchor section to form borehole 2.

[0062] S2. Insert the water-blocking plate 4 into the borehole 2.

[0063] Insert the sealing rubber ring 402 into borehole 2 to fix the disc 401 to the inner wall of rock stratum 3.

[0064] S3. Install the grating arch frame 1.

[0065] The first main reinforcement bar 101, the second main reinforcement bar 103, and the stirrups 102 are tied to form a steel reinforcement frame, and then the steel reinforcement frame is spliced ​​together with the first L-shaped steel bar 801 and the second L-shaped steel bar 802 to form a grid arch frame 1.

[0066] S4. Install the first and second anchors. Insert the anchor rod 5 or anchor cable 6 into the borehole 2 and apply prestress.

[0067] S5. Pour concrete to fill the grid arch 1. Pour concrete into the area of ​​grid arch 1 to form a concrete layer.

[0068] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A large-section chamber composite steel arch frame sprayed layer-discontinuous anchor support structure, characterized in that: include: Multiple grid arch frames (1) are arranged along the direction of the roadway extension, and adjacent grid arch frames (1) are connected and fixed. Anchoring assembly includes a grouting anchoring section set on the inner wall of the rock layer (3), a drill hole (2) is provided on the grouting anchoring section, a first anchor or a second anchor is provided in the drill hole (2), one end of the first anchor and the second anchor extends into the rock layer (3), and the tray end of the first anchor and the second anchor is fixed to the side of the grid arch (1) away from the rock layer (3). A water-blocking plate (4) is fixed at the opening of the borehole (2) and is used to block the borehole (2). The anchor passes through the water-blocking plate (4). The first anchor is an anchor rod (5), and the second anchor is an anchor cable (6), with the anchor rod (5) and the anchor cable (6) spaced apart. The grid arch frame (1) includes multiple steel reinforcement frames, and adjacent steel reinforcement frames are fixed together by connecting frames (8); The connecting frame (8) includes a first L-shaped steel (801) and a second L-shaped steel (802). The first L-shaped steel (801) and the second L-shaped steel (802) are respectively fixed to the ends of adjacent steel reinforcement frames. At least one mounting groove (803) is provided on the first L-shaped steel (801). A T-shaped mounting block (804) matching the mounting groove (803) is fixed on the second L-shaped steel (802). The T-shaped mounting block (804) is located in the mounting groove (803). The first L-shaped steel (801) and the second L-shaped steel (802) are fixed together. The steel reinforcement frame includes: four first main reinforcement bars (101), with rectangular arrangement at the ends; Multiple stirrups (102) are arranged along the extension direction of the first main reinforcement (101) and are sleeved and fixed on the outside of the four first main reinforcements (101); Two second main reinforcement bars (103) are fixed to the inner wall of the stirrup (102) and are located between the two first main reinforcement bars (101) arranged vertically. The tray end includes: a tray body (9), through which the anchor rod (5) or the anchor cable (6) is threaded and connected; At least one connecting rib (10) is fixed to the side of the disc body (9) near the steel reinforcement frame, the first main reinforcement (101) is located inside the connecting rib (10), and the disc body (9) and the connecting rib (10) are fixed to the first main reinforcement (101).

2. The large-section chamber composite steel arch frame sprayed layer-discontinuous anchor support structure according to claim 1, characterized in that: The water-blocking plate (4) includes: a plate body (401) fixed to the inner wall of the rock stratum (3); A sealing rubber ring (402) is disposed inside the borehole (2). One end of the sealing rubber ring (402) is fixed to the water-blocking plate (4), and the other end of the sealing rubber ring (402) is open. Water fills the sealing rubber ring (402) inside the borehole (2), and the sealing rubber ring (402) bulges up to block the borehole (2). The first anchor and the second anchor pass through the plate body (401) and the sealing rubber ring (402).

3. The large-section chamber composite steel arch frame sprayed layer-discontinuous anchor support structure according to claim 1, characterized in that: The two adjacent grid arch frames (1) are fixed by a connecting rib group, and the connecting ribs (7) in the two adjacent connecting rib groups are staggered.

4. A method for supporting a large-section chamber composite steel arch frame with sprayed layer and discontinuous anchor, used for constructing the large-section chamber composite steel arch frame sprayed layer and discontinuous anchor support structure as described in claim 1, characterized in that: The construction steps include: S1. Cast the grouting anchor section and drill holes at the grouting anchor end (2); S2. Insert the water-blocking plate (4) into the borehole (2); S3. Install the grid arch frame (1); S4. Install the first and second anchors; S5. Pour concrete to fill the grid arch frame (1).

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