Construction method of multi-stage cutting high slope control excavation system close to sensitive risk source

Abstract

The invention relates to a construction method of a multistage cutting high slope control excavation system close to a sensitive risk source, which adopts a broken rock mass permanent and temporary combined reinforcing mesh laying support technology, adopts permanent and temporary support structures for broken rock masses in different areas, is convenient to construct, and improves the support safety; spraying dust falling is conducted on an excavation area through the high-altitude spraying dust falling device, spraying full coverage of a slope excavation working face is achieved, the slope excavation construction environment is improved, and personnel health is guaranteed; according to the method, excavation construction is carried out by adopting a layered and segmented skip excavation technology, so that the influence and safety risk on the slope stability are reduced, the excavation construction efficiency is improved, the excavation cost is greatly saved, meanwhile, the disturbance on the original landform is also reduced, and the slope stability is enhanced.

Description

Technical Field

[0001] The invention belongs to the field of highway engineering, and in particular relates to a construction method of a multi-level cutting high slope controlled excavation system adjacent to a sensitive risk source. Background Art

[0002] In recent years, with the continuous development of regional economy, various large-scale infrastructure projects have been increasing to meet the needs of economic development. However, due to the special terrain restrictions, high slope stability problems frequently occur in the field of engineering construction, which greatly affects the quality and safety of the project. Many construction projects have to suspend construction due to high slope instability problems during the construction process. For high slope excavation near sensitive risk sources, the excavation and support methods have very high requirements. In order to ensure construction safety, it not only costs a lot of money, but also affects the construction progress. If it is not handled properly, it may cause endless troubles.

[0003] In view of this, in view of the shortcomings in previous road cutting high slope excavation construction, a new construction method of multi-level road cutting high slope controlled excavation system adjacent to sensitive risk sources is urgently needed to improve construction efficiency, improve construction quality and environmental quality, and ensure the safety and reliability of the construction process. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a construction method for a multi-level cutting high slope controlled excavation system adjacent to a sensitive risk source.

[0005] The construction method of the multi-level high slope controlled excavation system near the sensitive risk source includes the following steps:

[0006] Step 1: Slope support construction: Fix the steel mesh on the broken rock mass of the slope to form a support system;

[0007] Step 2: Installation of high-altitude spray dust reduction device: tracks are set on the slopes on both sides of the road surface, both ends of the high-altitude spray dust reduction device are set on the tracks through pulleys, and a rotatable spray head is set above the road surface of the high-altitude spray dust reduction device;

[0008] Step 3: Slope excavation construction: Turn on the high-altitude spray dust reduction device, divide the slope into blocks, and carry out layered and segmented excavation;

[0009] Step 4: Drainage construction: Dig drainage ditches on the slope and install composite cement blanket.

[0010] Preferably, in step one, the steel mesh is fixed to the temporary fixing bars by fixing wires or fixed to the broken rock mass by permanent fixing rings; the broken rock mass is located on the surface of the slope, the temporary fixing bars are arranged on the broken rock mass at the bottom of the slope, the steel mesh is laid on the surface of the broken rock mass, temporary fixing bars are arranged at a temporary fixed position on the broken rock mass, the steel mesh is fixed to the temporary fixing bars by fixing wires, and the steel mesh is fixed by permanent fixing rings at the permanent fixed protection position to form a support system.

[0011] Preferably, the high-altitude spray dust reduction device includes a track, a pulley, a shelf, a water tank, an inclined support frame, a water pipe, a water pipe fixing ring, a rotatable nozzle, a nozzle fixing part, a horizontal fixing rod and a water pump. A road surface is provided between the side slopes, the track is arranged on the side slopes, the pulley is arranged at the bottom of the shelf, the shelf is placed on the track, and the water tank is fixed on the shelf.

[0012] Preferably, in step two, the lower part of the inclined support frame is fixed on the shelf board, the upper part is connected to the horizontal fixed rod, one end of the water pipe is connected to the water pump, the water pipe fixing ring is fixed on the horizontal fixed rod, the rotatable nozzle is fixed on the water pipe through the nozzle fixing part, and the water pump is arranged inside the water tank.

[0013] Preferably, in step three, the slope is excavated layer by layer, each layer of the slope is divided into several sections, and the excavation is carried out in shifts, and the excavation of the next layer of the slope is carried out after the excavation of all sections in the whole layer of the slope is completed.

[0014] Preferably, the composite cement blanket is arranged on the drainage ditch by means of U-shaped nails.

[0015] A multi-level high slope of a cutting near a sensitive risk source is obtained by any of the above methods.

[0016] The beneficial effects of the present invention are:

[0017] 1) The present invention adopts the technology of permanent and temporary support of broken rock combined with steel mesh laying, and adopts permanent and temporary support structures for broken rock in different areas, which is convenient for construction and improves the safety of support.

[0018] 2) The present invention uses a high-altitude spray dust reduction device to spray dust reduction on the excavation area, achieving full spray coverage of the slope excavation working surface, improving the slope excavation construction environment, and ensuring the health of personnel.

[0019] 3) The present invention adopts layered and segmented skip-bin excavation technology for excavation construction, which reduces the impact on slope stability and safety risks, improves excavation construction efficiency, greatly saves excavation costs, and also reduces disturbance to the original landform and enhances slope stability.

[0020] 4) The present invention adopts composite cement blanket to assist drainage and anti-seepage technology for construction, which is convenient and quick to use, avoids the time-consuming and labor-intensive transportation and pouring of concrete, saves labor, ensures construction quality and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a side view of the system structure of the permanent support combined with the laying of steel mesh in the broken rock mass;

[0022] Figure 2 This is the front view of the broken rock mass permanent combined with steel mesh laying support system structure;

[0023] Figure 3 This is a front view of the structure of the high-altitude spray dust suppression device;

[0024] Figure 4 This is a side view of the structure of the high-altitude spray dust suppression device;

[0025] Figure 5 It is a schematic diagram of the structure of the layered and segmented skip-bin excavation technology;

[0026] Figure 6 This is a front view of a composite cement blanket-assisted anti-drainage and anti-seepage structure;

[0027] Figure 7 It is a top view of the composite cement blanket assisted drainage and anti-seepage structure.

[0028] In the figure: 1-slope, 2-broken rock mass, 3-steel mesh, 4-temporary fixing ribs, 5-fixing wire, 6-permanent fixing ring, 7-pavement, 8-drainage ditch, 9-track, 10-pulley, 11-shelf board, 12-water tank, 13-inclined support frame, 14-water pipe, 15-water pipe fixing ring, 16-rotatable sprinkler, 17-sprinkler fixing part, 18-horizontal fixing rod, 19-water pump, 20-composite cement blanket, 21-U-shaped nail. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0030] Embodiment 1

[0031] As an embodiment, the construction method of the multi-level high slope controlled excavation system near the sensitive risk source includes the following steps:

[0032] Step 1: Construction preparation: Be familiar with the construction drawings, inspect the construction site against the drawings, determine the scope of construction operations, thoroughly clean up buildings that may affect construction, formulate and implement reliable safety protection measures, and bring in relevant construction equipment and materials.

[0033] Step 2, slope support construction: temporary fixing bars 4 are set at temporary fixed positions on the slope 1, the steel mesh 3 is fixed to the temporary fixing bars 4 by fixing wires 5, and the steel mesh 3 is fixed by permanent fixing rings 6 at permanent fixed protection positions to form a support system.

[0034] Step 3. Installation of high-altitude spray dust reduction device: track 9 is set on the slope 1, pulley 10 is set at the bottom of shelf 11, shelf 11 is placed on track 9, water tank 12 is fixed on shelf 11, lower part of inclined support frame 13 is fixed on shelf 11, upper part is connected with horizontal fixed rod 18, one end of water pipe 14 is connected with water pump 19, water pipe fixing ring 15 is fixed on horizontal fixed rod 18, rotatable nozzle 16 is fixed on water pipe 14 through nozzle fixing part 17, water pump 19 is set inside water tank 12.

[0035] Step 4: Slope excavation construction: Divide the slope 1 into blocks, excavate the slope 1 layer by layer, divide each layer of the slope 1 into several sections, and excavate in shifts. After completing the excavation of all sections in the entire layer of slope 1, proceed to the excavation of the next layer of slope 1. Figure 5 As shown, excavation is carried out in layers and sections in the order of one-two-.........-ten. When the dust is heavy, the high-altitude spray dust reduction device is turned on.

[0036] Step 5: Drainage construction: a drainage ditch 8 is excavated on the slope 1 , and a composite cement blanket 20 is set on the drainage ditch 8 by means of U-shaped nails 21 .

[0037] Step 6. Construction completion: After acceptance, the relevant equipment will be removed from the site.

[0038] Embodiment 2

[0039] As another embodiment, the second embodiment proposes, based on the first embodiment, a multi-level high slope controlled excavation system near a sensitive risk source, such as Figures 1 to 7 As shown, it includes a permanent and temporary support system for broken rock mass combined with steel mesh laying, a high-altitude spray dust reduction device, a layered and segmented skip-bin excavation technology, and a composite cement blanket auxiliary drainage and anti-seepage structure;

[0040] The broken rock mass permanent combined with steel mesh laying support system is fixed on the broken rock mass 2;

[0041] Specifically, Figure 1 and Figure 2As shown, the broken rock mass permanent and temporary combined steel mesh laying support system includes a broken rock mass 2, a steel mesh 3, temporary fixing bars 4, a fixing wire 5, and a permanent fixing ring 6. The broken rock mass 2 is on the slope 1, the temporary fixing bars 4 are arranged on the slope 1, the steel mesh 3 is fixed to the temporary fixing bars 4 by the fixing wire 5, and the steel mesh 3 can also be fixed by the permanent fixing ring 6.

[0042] Both ends of the high-altitude spray dust reduction device slide on the side slopes 1 on both sides of the road surface 7, including a horizontal fixed rod 18 spanning the road surface 7, and rotatable spray heads 16 are arranged on the horizontal fixed rod 18 at intervals.

[0043] Specifically, Figure 3 and Figure 4 As shown, the high-altitude spray dust reduction device includes a road surface 7, a track 9, a pulley 10, a shelf 11, a water tank 12, an inclined support frame 13, a water pipe 14, a water pipe fixing ring 15, a rotatable nozzle 16, a nozzle fixing piece 17, a horizontal fixing rod 18, and a water pump 19. The road surface 7 is between the road cut slopes 1 on both sides, the track 9 is arranged on the slope 1, the pulley 10 is arranged at the bottom of the shelf 11, the shelf 11 is placed on the track 9, the water tank 12 is fixed on the shelf 11, the lower part of the inclined support frame 13 is fixed on the shelf 11, and the upper part is connected to the horizontal fixing rod 18, one end of the water pipe 14 is connected to the water pump 19, and is fixed to the horizontal fixing rod 18 through the water pipe fixing ring 15, the rotatable nozzle 16 is fixed to the water pipe 14 through the nozzle fixing piece 17, and the water pump 19 is arranged inside the water tank 12.

[0044] The composite cement blanket auxiliary anti-drainage and anti-seepage structure comprises a drainage ditch 8, which is arranged on the slope 1, and a composite cement blanket 20 is arranged on the wall surface of the drainage ditch 8.

[0045] Specifically, Figure 6 and Figure 7 As shown, the composite cement blanket auxiliary drainage and anti-seepage structure includes a drainage ditch 8, a composite cement blanket 20, and U-shaped nails 21. The drainage ditch 8 is set on the slope 1, and the composite cement blanket 20 is set on the drainage ditch 8 through the U-shaped nails 21.

[0046] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0047] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a multi-level high slope controlled excavation system near a sensitive risk source, characterized in that: The following steps are involved: Step 1: Slope support construction: Fix the steel mesh on the broken rock mass of the slope to form a support system; Step 2: Installation of high-altitude spray dust suppression device: tracks are set on the slopes on both sides of the road surface, both ends of the high-altitude spray dust suppression device are set on the tracks through pulleys, and a rotatable spray head is set above the road surface of the high-altitude spray dust suppression device; Step 3: Slope excavation construction: Turn on the high-altitude spray dust reduction device, divide the slope into blocks, and carry out layered and segmented excavation; Step 4: Drainage construction: Dig drainage ditches on the slope and install composite cement blanket.

2. The construction method of the multi-level high slope controlled excavation system near the sensitive risk source according to claim 1 is characterized in that: In step one, the steel mesh is fixed to the temporary fixing bars by fixing iron wire or fixed to the broken rock mass by permanent fixing ring; the broken rock mass is located on the surface of the slope, the temporary fixing bars are arranged on the broken rock mass at the bottom of the slope, the steel mesh is laid on the surface of the broken rock mass, temporary fixing bars are arranged at a temporary fixed position on the broken rock mass, the steel mesh is fixed to the temporary fixing bars by fixing iron wire, and the steel mesh is fixed to the permanent fixing ring at the permanent fixed protection position to form a support system.

3. The construction method of the multi-level high slope controlled excavation system near the sensitive risk source according to claim 1 is characterized in that: The high-altitude spray dust reduction device includes a track, a pulley, a shelf, a water tank, an inclined support frame, a water pipe, a water pipe fixing ring, a rotatable nozzle, a nozzle fixing part, a horizontal fixing rod and a water pump. A road surface is provided between the side slopes. The track is arranged on the side slopes. The pulley is arranged at the bottom of the shelf. The shelf is placed on the track, and the water tank is fixed on the shelf.

4. The construction method of the multi-level high slope controlled excavation system near the sensitive risk source according to claim 3 is characterized in that: In step two, the lower part of the inclined support frame is fixed on the shelf board, and the upper part is connected to the horizontal fixed rod. One end of the water pipe is connected to the water pump. The water pipe fixing ring is fixed on the horizontal fixed rod. The rotatable nozzle is fixed on the water pipe through the nozzle fixing part, and the water pump is arranged inside the water tank.

5. The construction method of the multi-level high slope controlled excavation system near the sensitive risk source according to claim 1 is characterized in that: In step three, the slope is excavated layer by layer. Each layer of the slope is divided into several sections. The excavation is adjusted. After the excavation of all sections in the entire layer of the slope is completed, the excavation of the next layer of the slope is carried out.

6. The construction method of the multi-level high slope controlled excavation system near sensitive risk sources according to claim 1 is characterized in that: The composite cement blanket is arranged on the drainage ditch through U-shaped nails.

7. Multi-level high slopes near sensitive risk sources, characterized by: Obtained by the method according to any one of claims 1 to 6.

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