A large cave auxiliary grouting device for tunnel expansion and a use method thereof

Abstract

The application provides a large cave auxiliary grouting device for tunnel expansion and a use method, which comprises a grouting platform, grouting racks are arranged on the two sides of the grouting platform, a channel is left between the grouting racks, a steel bar is connected to the bottom of the grouting rack, a support steel column A is fixed between the grouting platform and the steel bar, an inclined steel plate is connected to the two ends of the grouting platform, a plurality of support steel columns B are connected to the lower end of the inclined steel plate, a plurality of steel blocks are uniformly distributed on the inclined steel plate, a ramp plate is movably arranged between the steel blocks, and a drilling machine is placed on the grouting platform. The auxiliary grouting device can facilitate the drilling machine to go up and down the platform, and at the same time of grouting, the construction personnel can transport the materials of the next expansion section of the large cave through the material channel of the grouting rack, so that the parallel construction of the cave treatment and expansion is realized, and the work efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, and in particular to an auxiliary grouting device and method for use in large karst caves during tunnel widening. Background Technology

[0002] For railway double-track tunnels that expand from existing small-section parallel pilot tunnels to large-section tunnels, the construction progress is extremely slow when the expanded tunnel passes through large karst caves. The current construction method involves segmented excavation of the large karst cave. After each segment is excavated, a grout stop wall is constructed. After the grout stop wall is completed, a drilling rig is used to perform curtain grouting at the tunnel face and to construct pipe roofs. Curtain grouting is first performed on the lower half of the karst cave section. When performing curtain grouting on the upper half of the karst cave section, tunnel muck is placed on the lower half of the section to facilitate the drilling rig's ascent for curtain grouting on the upper half. Therefore, placing tunnel muck on the lower half of the section for karst cave treatment significantly impacts the logistics and traffic flow in the lower half of the tunnel, thus affecting the excavation of the next section of the tunnel through the large karst cave, reducing the expansion efficiency, and prolonging the construction period.

[0003] Patent No. CN201810525525.5, filed on 2018-05-28, discloses an auxiliary grouting platform for tunnel widening and crossing large karst caves. The platform employs a steel frame structure with a material channel running through the middle. Steel plates are fixed to the top, left, and right walls of the steel frame. Temporary ramps for the drilling rig are provided on the left and right sides of the grouting platform and between them and the grout-stopping wall of the previous widened section of the large karst cave. The space above the grouting platform and the top of the large karst cave constitutes the drilling rig grouting operation space. This invention also provides a construction method for tunnel widening and crossing large karst caves.

[0004] The aforementioned patent, through a redesigned grouting platform with material channels combined with temporary ramps for the drilling rig's upper and lower platforms arranged on the left and right sides of the grouting platform, enables parallel operations of cavity treatment and widening excavation in large karst caves. This significantly improves tunnel widening efficiency, shortens the construction period, and is safe, reliable, and easy to operate, while ensuring construction safety. However, it still requires the use of tunnel muck to build temporary ramps for the drilling rig's upper and lower platforms. After grouting one end of the widened section is completed, the auxiliary grouting platform needs to be moved and the temporary ramps for the drilling rig's upper and lower platforms need to be rebuilt, resulting in a large workload. Furthermore, the auxiliary grouting platform is not easy to move. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an auxiliary grouting device and method for large karst caves during tunnel widening, which enables construction personnel to transport materials to the next section to be widened in the large karst cave through the material channel of the grouting platform while grouting.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A grouting auxiliary device for large karst caves during tunnel widening includes a grouting platform, grouting frames on both sides of the grouting platform, a passage between the grouting frames, steel bars connected to the bottom of the grouting frames, supporting steel columns A fixed between the grouting platform and the steel bars, inclined steel plates connected to both ends of the grouting platform, multiple supporting steel columns B connected to the lower end of the inclined steel plates, multiple steel blocks evenly distributed on the inclined steel plates, ramp plates movably arranged between the steel blocks, and a drilling rig placed on the grouting platform.

[0008] An installation block is provided on the outer side of the supporting steel column, a jack is provided at the bottom of the installation block, and a steel wheel B is provided at the bottom of the jack.

[0009] An inclined steel rod connects the inclined steel plate to the mounting block, and a reinforcing member connects the grouting platform to the grouting frame.

[0010] The bottom end of the supporting steel column B is provided with a steel wheel A, and the bottom of the steel wheel A is flush with the bottom of the steel bar.

[0011] The grouting platform is made of steel plate, and the grouting frame is a steel frame structure.

[0012] The inclined steel plate is tilted at 45°.

[0013] A method for using an auxiliary grouting device for large karst caves during tunnel widening includes the following steps:

[0014] S1. Large karst caves are expanded in sections. A grout-stopping wall is constructed on the section above the completed expansion of the large karst cave. The grout-stopping wall is cast in one go and is set across the entire cross section. Mortar anchors are constructed on the working face. The mortar anchors are partially exposed and cast into the grout-stopping wall. The thickness of the rock layer is not less than three meters.

[0015] S2. In the section of the large karst cave that has been widened and completed, curtain grouting is carried out on the lower half of the tunnel section by using a drilling rig.

[0016] S3. After the grouting of the lower half of the tunnel is completed, the auxiliary grouting device is set up in the middle of the left and right sides in the section above the large karst cave. The drilling rig is moved to the top of the grouting platform through the ramp between the two inclined steel plates. In the section above the large karst cave, the upper half of the tunnel is grouted.

[0017] S4. After the drilling rig reaches the top of the grouting platform, the ramp slab is removed. At the same time, the construction personnel transport materials to the next section to be expanded through material channel 3, thus realizing the parallel construction of karst cave treatment and expansion.

[0018] S5. Repeat steps S1 to S4 until the entire large karst cave is excavated. When repeating step S, it is necessary to move the auxiliary grouting device. At this time, use a jack to lift the steel bar at the bottom of the auxiliary grouting device off the ground, and the steel wheel B at the bottom of the jack replaces the steel bar to contact the ground. Then move the auxiliary grouting device.

[0019] The beneficial effects of this invention are:

[0020] 1. The auxiliary grouting device facilitates the drilling rig's movement on and off the platform. Simultaneously, construction personnel can transport materials to the next section of the large karst cave to be excavated through the material channel of the grouting platform, thus realizing parallel construction of karst cave treatment and excavation, greatly improving work efficiency.

[0021] 2. With the installation of jacks and steel wheels B, the auxiliary grouting platform can be moved relatively easily, facilitating its movement to the next excavation completion section. Attached Figure Description

[0022] Figure 1 This is a side view of the auxiliary grouting device of the present invention;

[0023] Figure 2 This is a front view of the auxiliary grouting device of the present invention;

[0024] Figure 3 This is a front view of the auxiliary grouting device of the present invention after the ramp slab has been removed;

[0025] Figure 4 This is a front view of the steel bar and supporting steel column of the present invention.

[0026] The diagram shows: 1. Grouting platform; 2. Grouting frame; 3. Channel; 4. Steel bar; 5. Supporting steel column A; 6. Inclined steel plate; 7. Steel block; 8. Ramp slab; 9. Supporting steel column B; 10. Steel wheel A; 11. Mounting block; 12. Jack; 13. Steel wheel B; 14. Reinforcing member; 15. Inclined steel rod; 16. Drilling rig. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 4As shown, an auxiliary grouting device for large karst caves during tunnel widening includes a grouting platform 1, grouting frames 2 on both sides of the grouting platform 1, a passage 3 between the grouting frames 2, steel bars 4 connected to the bottom of the grouting frames 2, a supporting steel column A5 fixed between the grouting platform 1 and the steel bars 4, inclined steel plates 6 connected to both ends of the grouting platform 1, multiple supporting steel columns B9 connected to the lower end of the inclined steel plates 6, multiple steel blocks 7 evenly distributed on the inclined steel plates 6, ramp plates 8 movably arranged between the steel blocks 7, and a drilling rig 16 placed on the grouting platform 1.

[0029] An installation block 11 is provided on the outer side of the supporting steel column A5, a jack 12 is provided at the bottom of the installation block 11, and a steel wheel B13 is provided at the bottom of the jack 12.

[0030] An inclined steel rod 15 is connected between the inclined steel plate 6 and the mounting block 11, and a reinforcing member 14 is connected between the grouting platform 1 and the grouting frame 2.

[0031] The bottom end of the supporting steel column B9 is provided with a steel wheel A10, and the bottom of the steel wheel A10 is flush with the bottom of the steel bar 4.

[0032] The grouting platform 1 is a steel plate, and the grouting frame 2 is a steel frame structure.

[0033] The inclined steel plate 6 is tilted at 45°.

[0034] A method for using an auxiliary grouting device for large karst caves during tunnel widening includes the following steps:

[0035] S1. Large karst caves are expanded in sections. A grout-stopping wall is constructed on the section above the completed expansion of the large karst cave. The grout-stopping wall is cast in one go and is set across the entire cross section. Mortar anchors are constructed on the working face. The mortar anchors are partially exposed and cast into the grout-stopping wall. The thickness of the rock layer is not less than three meters.

[0036] S2. In the section of the large karst cave that has been expanded and completed, curtain grouting is carried out on the lower half of the tunnel section by using drilling rig 16.

[0037] S3. After the grouting of the lower half of the tunnel is completed, the auxiliary grouting device is set up in the middle of the left and right sides in the upper section of the large karst cave. The drilling rig 16 goes up to the top of the grouting platform 1 through the ramp 8 that is movably erected between the two inclined steel plates 6. In the upper section of the large karst cave, the upper half of the tunnel is grouted.

[0038] S4. After the drilling rig 16 reaches the top of the grouting platform 1, the ramp slab 8 is removed. At the same time, the construction personnel transport materials to the next section to be expanded through the material channel 3, thus realizing the parallel construction of karst cave treatment and expansion.

[0039] S5. Repeat steps S1 to S4 until the entire large karst cave is excavated. When repeating step S3, it is necessary to move the auxiliary grouting device. At this time, the steel bar 4 at the bottom of the auxiliary grouting device is lifted off the ground by jack 12, and the steel wheel B13 at the bottom of jack 12 replaces the steel bar 4 to contact the ground. At this time, the auxiliary grouting device is moved.

[0040] The bottom of each grouting platform 1 is welded with a grouting frame 2. The grouting frame 2 is a steel frame structure, and a passage 3 running through both sides is set in the middle of the frame. Construction personnel use the passage 3 in the middle of the grouting frame 2 to transport materials to the next section to be excavated in the large karst cave, thus realizing parallel construction of karst cave treatment and excavation, improving efficiency. Steel bars 4 are welded to both sides of the bottom of the grouting frame 2. The steel bars 4 are fixed to the grouting platform 1 by supporting steel columns A5. Inclined steel plates 6 are set on the outer side of the supporting steel columns A5, and steel blocks 7 are evenly welded to the top of the inclined steel plates 6. Furthermore, a ramp 8 is movably supported between the two inclined steel plates 6 via steel blocks 7. The inclined steel plates 6 and ramp 8 form a ramp on the front and rear sides of the grouting platform 1, facilitating the drilling rig 16 to go up and down. The ramp 8 is movably supported and can be disassembled. Disassembly will not affect the material transport function of the channel 3. The inclined steel plates 6 are inclined at a 45-degree angle, and their tops are welded and fixed to the side of the grouting platform 1. Two supporting steel columns B9 are welded to the bottom of the inclined steel plates 6. Steel wheels A10 are set at the bottom of the supporting steel columns 9, and the bottom of the steel wheels A10 is flush with the bottom of the steel bars 4.

[0041] The auxiliary grouting device facilitates the movement of the drilling rig 16 up and down the platform. At the same time as grouting, construction personnel can transport materials to the next section to be excavated in the large karst cave through the material channel 3 of the grouting platform 2. This enables parallel construction of karst cave treatment and excavation, greatly improving work efficiency.

[0042] With the installation of jack 12 and steel wheel B13, the auxiliary grouting platform can be moved relatively easily, facilitating its movement to the next excavation completion section.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for using an auxiliary grouting device for large karst caves during tunnel widening, the grouting device comprising a grouting platform (1), characterized in that: The grouting platform (1) is provided with grouting frame (2) on both sides, and a channel (3) is left between the grouting frame (2). The bottom of the grouting frame (2) is connected with a steel bar (4). A supporting steel column A (5) is fixed between the grouting platform (1) and the steel bar (4). Inclined steel plates (6) are connected to both ends of the grouting platform (1). Multiple supporting steel columns B (9) are connected to the lower end of the inclined steel plate (6). Multiple steel blocks (7) are evenly distributed on the inclined steel plate (6). A ramp plate (8) is movably arranged between the steel blocks (7). A drilling rig (16) is placed on the grouting platform (1). An installation block (11) is provided on the outer side of the supporting steel column A (5), a jack (12) is provided at the bottom of the installation block (11), and a steel wheel B (13) is provided at the bottom of the jack (12); a steel wheel A (10) is provided at the bottom end of the supporting steel column B (9), and the bottom of the steel wheel A (10) is flush with the bottom of the steel bar (4); An inclined steel rod (15) is connected between the inclined steel plate (6) and the mounting block (11), and a reinforcing member (14) is connected between the grouting platform (1) and the grouting frame (2); The usage method includes the following steps: S1. Large karst caves are expanded in sections. A grout-stopping wall is constructed on the section above the completed expansion of the large karst cave. The grout-stopping wall is cast in one go and is set across the entire cross section. Mortar anchors are constructed on the working face. The mortar anchors are partially exposed and cast into the grout-stopping wall. The thickness of the rock layer is not less than three meters. S2. In the section of the large karst cave that has been expanded and completed, curtain grouting is carried out on the lower half of the tunnel section by using a drilling rig (16). S3. After the grouting of the lower half of the tunnel is completed, the auxiliary grouting device is set up in the middle of the left and right sides in the upper section of the large karst cave. The drilling rig (16) moves up to the top of the grouting platform (1) through the ramp (8) between the two inclined steel plates (6). In the upper section of the large karst cave, the upper half of the tunnel is grouted. S4. When the drilling rig (16) reaches the top of the grouting platform (1), the ramp slab (8) is removed. At the same time, the construction personnel transport materials to the next section to be excavated in the large karst cave through the material channel (3), thus realizing the parallel construction of karst cave treatment and excavation. S5. Repeat steps S1 to S4 until the entire large karst cave is excavated. When repeating step S3, the auxiliary grouting device needs to be moved. At this time, the steel bar (4) at the bottom of the auxiliary grouting device is lifted off the ground by the jack (12), and the steel wheel B (13) at the bottom of the jack (12) replaces the steel bar (4) and contacts the ground. At this time, the auxiliary grouting device is moved.

2. The method of using the auxiliary grouting device for large karst caves during tunnel widening as described in claim 1, characterized in that: The grouting platform (1) is a steel plate, and the grouting frame (2) is a steel frame structure.

3. The method of using a grouting device for large karst caves during tunnel widening as described in claim 1, characterized in that: The inclined steel plate (6) is inclined at 45°.

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