CN111779004A - Construction process for fast supporting high slope of broken rock by strong unloading - Google Patents
Construction process for fast supporting high slope of broken rock by strong unloading Download PDFInfo
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- CN111779004A CN111779004A CN202010711961.9A CN202010711961A CN111779004A CN 111779004 A CN111779004 A CN 111779004A CN 202010711961 A CN202010711961 A CN 202010711961A CN 111779004 A CN111779004 A CN 111779004A
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- 238000010276 construction Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000011435 rock Substances 0.000 title claims abstract description 31
- 230000008093 supporting effect Effects 0.000 title claims abstract description 19
- 238000004873 anchoring Methods 0.000 claims abstract description 42
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 15
- 238000007493 shaping process Methods 0.000 claims abstract description 11
- 238000009412 basement excavation Methods 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 22
- 239000004567 concrete Substances 0.000 claims description 18
- 239000004570 mortar (masonry) Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 8
- 238000005422 blasting Methods 0.000 claims description 7
- 239000011378 shotcrete Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- 238000007569 slipcasting Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 206010057175 Mass conditions Diseases 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a construction process for fast supporting a high slope with strong unloading and broken rock, which comprises the steps of excavating and grouting, slope surface reinforcing and slope surface shaping, wherein the excavating and supporting whole construction process comprises the steps of excavating and grouting, excavating and grouting the slope to form a step slope surface with steps, excavating a second step after the excavating and grouting of a first step slope surface is finished, and beginning the slope surface reinforcing step of the first step, the slope surface reinforcing step of the first step is finished to reinforce the slope surface of the second step and shape the slope surface of the first step, and the adjacent steps among the three steps keep a step difference to downwards perform three-step assembly line operation until the construction of all steps is finished, the method has the advantages of short construction time, effectively shortened connection time among all working procedures, reduced pore-forming problem, ensured full grouting of the anchoring section and non-interference of three-step synchronous construction flow line operation.
Description
Technical Field
The invention relates to the field of side slope construction processes, in particular to a high-slope quick support construction process for a strong unloading broken rock.
Background
The strong unloading broken rock mass is a geological condition frequently encountered in water conservancy, highway and railway engineering, and is characterized by mainly comprising the following aspects: firstly, the cracks are developed and broken and loosened, and the hole wall is easy to collapse and drill sticking is easy to occur during hole forming; hardness, compared with the common loose and cracked stratum, the hardness of the rock is higher, and the abrasion of the drilling tool is larger; leakage, deep unloading degree of the side slope, wide crack development, communication, serious pore-forming air leakage and grouting loss; and fourthly, dividing the stratum into a plurality of fault layers, and obviously showing the alternate soft and hard stratum. For roads and railways, the influence of the mountaineering tunnel on engineering construction can be reduced. However, in water conservancy projects, in order to ensure the safety of important permanent buildings such as dams, plants, water inlets and water outlets, slope excavation needs to be carried out, and high slopes of more than one hundred meters are often formed.
The common support forms of the hydraulic engineering high slope comprise anchor rods, anchor bar piles, net hanging sprayed concrete, grid beams and prestressed anchor cables, and the slope stability can be ensured only by the support form of the cooperative stress of the grid beams, the prestressed anchor cables, anchor pull plates and the prestressed anchor cables for the slope which is particularly broken and has a large gradient. The common supporting structure forms have simple construction and good supporting effect in relatively complete rock mass conditions, but in strong unloading broken rock masses, the problems of hole collapse, air leakage, slurry leakage and slurry mixing during hole forming of anchor rods, anchor bar piles and anchor cables are extremely prominent, the construction cost is increased sharply, and the supporting quality and the engineering progress are seriously influenced. Meanwhile, the construction period is long due to the limitation of anchor cable process characteristics, and the construction period is difficult to synchronize with the side slope excavated by machinery. Therefore, irreconcilable contradictions exist in the aspects of progress, safety and quality of excavation and support of the strong unloading broken rock mass side slope, and therefore a construction process for quickly supporting the strong unloading broken rock mass high side slope is provided.
Disclosure of Invention
The invention aims to solve the defects in the background technology and provides a construction process for quickly supporting a high slope of strong unloading broken rock. The technical scheme adopted by the invention is as follows: the method comprises the following steps of reducing weight and slimming of a far side slope of a lower step, combining near side slope presplitting blasting and mechanical excavation, carrying out layered deslagging, sealing plain jet, supporting along with a layer, carrying out system follow-up and rolling line production, sequentially implementing middle step anchor piers, net hanging jet mixing, strong tensioning of anchor cables, grid beams, closing an upper step pavement planting groove, covering soil and a drain hole, and carrying out three-step synchronous implementation principle organization construction; the upper step, the middle step and the lower step are synchronously constructed and operated in a flow mode, so that the linear construction period occupied by anchor rope grouting, anchor pier concrete waiting strength and anchor rope tensioning is effectively shortened, and the downward excavation supporting progress is accelerated.
The invention is realized by the following technical method: the fast supporting construction process for high slope with strong unloading and broken rock includes the following steps:
the method comprises the steps of excavating and grouting, slope reinforcing and slope shaping, wherein the excavating and grouting is carried out to excavate a slope into step-by-step slopes, after the excavating and grouting of a first step slope is finished, a second step is excavated continuously, the slope reinforcing step of the first step is started, the slope reinforcing step of the first step is finished, the slope reinforcing of the second step and the slope shaping of the first step are carried out, and adjacent steps among the three steps keep a step difference, and three-step assembly line operation is carried out downwards until the construction of all steps is finished.
The slope shaping step comprises the steps of pouring a pavement planting groove, covering soil in the planting groove and draining water; the slope surface reinforcing step comprises the steps of pouring anchor piers and grid beams; the excavating and grouting step comprises excavating layer by layer and punching and grouting.
Pre-splitting blasting, bench blasting and weight-reducing excavation are carried out on each section of slope surface before the excavation grouting step is carried out, an operation space is reserved on the top of the slope after the weight-reducing excavation, the top width is controlled to be 10-15m, and the steps are as follows: 1 temporary slope ratio slope releasing.
In the excavation grouting step, four layers are constructed layer by layer: excavation → plain shotcrete sealing → anchor rod, anchor bar pile, anchor cable pore-forming → anchor rod and anchor cable rope laying → pipe drawing → anchor rod grouting, anchor bar pile and anchor cable anchor grouting.
The hole forming adopts a method of fixing the wall with the pipe to form the hole, and the anchoring section of the formed hole is subjected to in-hole camera shooting and pre-grouting.
In the slope surface reinforcing step: the anchor pier is pour and is included: the method comprises the following steps of simple scaffold → anchor pier foundation treatment → anchor pier dowel → anchor pier steel bar and template → anchor pier concrete pouring → anchor cable to be tensioned strongly; the grid beam pouring comprises the following steps: hanging a steel bar mesh → spraying concrete → binding the steel bars of the grid beam → the template → pouring the concrete of the grid beam.
The pavement planting groove pouring in the slope shaping step comprises the following construction procedures: measuring and paying off, inserting the steel bars, erecting the template, pouring concrete, maintaining, planting soil and covering soil.
The drainage construction in the step of shaping the slope surface comprises the following construction procedures: measuring and paying off, constructing drain holes, inserting drain pipes and sealing mortar.
The movable crawler-type drilling machine is adopted to construct the anchor rods, the anchor bar piles and the anchor cable holes, so that the time for building the scaffold and the time for moving the drilling machine are saved.
By utilizing the characteristics of high efficiency and convenience in movement of the crawler drills, each crawler drill can be simultaneously responsible for the construction of 3-5 anchor cable holes, the strong wall fixing and waiting time of the anchor cables is utilized, the anchor rod construction operation is alternated, the system supporting and anchor cable hole forming effects are greatly improved, and the time for layered excavation supporting is greatly shortened.
The hole-forming of stock, anchor bar pile adopts with the pipe pore-forming, and the tube drawing after the pore-forming, the inserted bar, and the slip casting is gone on in proper order, ligature PVC pipe on stock, the anchor bar pile, and the hole of blooming, the thick liquid has improved the slip casting quality to peripheral diffusion.
The anchor cable hole forming adopts a method of pipe following and wall fixing, a pipe following hole forming drill bit eccentric expanding drill bit and a P110 special pipe following material are adopted, a straight drill bit hole is used for mortar wall fixing, the drilling tool is circularly advanced, the problems of hole collapse and drill jamming and drilling tool abrasion can be well solved, and the one-time hole forming rate of the anchor cable hole forming is improved.
The anchor cable uses the unbonded anchor cable, so that the quality problems caused by strong unloading cracked stratum fracture communication, slurry leakage and slurry string are avoided.
For improving the grouting quality of the anchoring section, the grouting of the anchoring section is guaranteed to be compact, the complete condition of the rock mass of the anchoring section is identified by using an in-hole camera shooting technology, whether pre-grouting is used or not is determined, and the grouting quality of the anchoring section is effectively guaranteed. According to the anchor cable constructed by the method, grouting at the anchoring section can reach the end standard of the design requirement.
The pouring slurry is mixed by the centralized pulping station, the clean slurry is directly poured into the hole from the centralized pulping station, the cement for mixing is firstly conveyed into a mortar stirrer close to the working surface, and the mixed cement is poured into the anchor cable hole by a mortar pump after being mixed with sand and stirred uniformly on site.
The anchor cable grouting is divided into five stages of grouting, wall fixing grouting, anchoring section pre-grouting, anchoring section grouting, tensioning section grouting and orifice section sealing grouting, and grouting in each stage is different in grouting material, grouting pressure and finishing standard according to different grouting purposes.
And treating the anchor section foundation, and adopting two measures of pouring a cushion layer and increasing the size of the anchor pier to improve the bearing capacity of the anchor pier foundation.
The anchor cable construction process is more, and the cycle is long, with the anchor cable each process share in different step construction, reduced the shared straight line time limit for a project of anchor cable construction, reach the effect of digging down fast.
Compared with the prior art, the invention has the following beneficial effects:
1. the construction time is short: the average required working time of each bench for rapid excavation and support is about 30 days, the time is shortened by 2 months compared with the conventional support time, the conventional support needs 10 days for building the bent, the demolition needs 5 days, the time is long, the bent time is saved for rapid support, and the strong tensioning such as anchor rope grouting, anchor pier concrete, anchor rope and the like, grid beam concrete, net hanging and spraying concrete, pavement planting grooves and drain holes are not constructed in an excavation and support operation layer, so that the straight-line construction period is not occupied.
2. The characteristics of high pore-forming efficiency, convenient movement and strong power of the movable crawler-type drilling machine are fully utilized, the pore-forming time of the anchor cable and the connection time of each process are shortened, the strong wall fixing time of the anchor cable is utilized, the anchor rod construction operation is alternated, the system supporting and anchor cable pore-forming effects are greatly improved, and the time of layered excavation supporting is greatly shortened. The method also reduces the scaffold erection time and saves manpower and material resources.
3. Adopt and follow pipe pore-forming side construction cement mortar stock, anchor bar pile, installation PVC pipe flower hole on the body of rod, cement mortar injection can effectively guarantee the construction quality of stock anchor bar pile, plays the consolidation effect to peripheral cliff simultaneously.
4. The hole forming construction process of 'pipe following + wall fixing + pre-grouting' can be well adapted to the hole forming work of the strong unloading broken rock anchor rope, the method overcomes the process defects of long fixed wall grouting cycle footage period time, high cost, serious abrasion of hole forming jamming, drilling tools and pipe shoes of the full pipe following and high waste hole rate, and saves the construction cost while ensuring the construction period.
5. And pre-grouting the anchoring section, and checking the integrity of the anchoring section by using a camera in a matching hole to ensure the integrity of the rock mass of the anchoring section.
6. The anchor cable is an unbonded anchor cable, the anchoring section is provided with two grouting pipes one in and one in, the grouting pipes of the anchoring section are deep into the hole bottom by 30cm, the grouting pipes of the anchoring section are arranged within the boundary position of the anchoring section and the tensioning section by 50cm, and the grout inlet pipes are provided with flower holes at intervals of 1m within the range of the anchoring section, so that grout can be conveniently diffused; the tensioning section is provided with a slurry inlet pipe and a slurry return pipe, the slurry inlet pipe extends deep to the decomposition positions of the free end and the anchoring section, the middle of the slurry inlet pipe is provided with a hole, and the distance between the slurry inlet pipe and the anchoring section is 2 m; the hole is provided with a slurry return pipe for exhausting and supplementing slurry at the free end.
7. The anchor section foundation is treated, two measures of pouring a cushion layer and increasing the size of the anchor pier are taken, the problems of insufficient bearing capacity and tensioning settlement of the anchor pier foundation are solved, and the effect is obvious.
8. The key of the three-step synchronous construction line operation lies in that all work does not occupy a straight-line construction period, when the lower step carries out hole forming and grouting on an anchor rod, an anchor bar pile and an anchor rope, the middle step starts anchor pier foundation treatment and anchor pier construction by building a simple support, when the anchor piers are to be strongly tensioned, hanging net and spraying concrete and grid beam concrete are implemented, the upper step carries out construction of non-critical items such as a pavement planting groove, soil covering and drainage, three-step operation is not interfered with each other, and the utilization efficiency of personnel, machinery and equipment is maximized.
Drawings
Fig. 1 is a schematic view of the construction state of the three-step excavation support of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Example 1
The fast support construction process for high slope with strong unloading and broken rock includes the following steps:
three steps are synchronously implemented: each flow circulation comprises an upper step, a middle step and a lower step, the construction projects and the sequence of the steps are as follows, and the steps are sequentially carried out according to the sequence numbers:
step-up: the inserting ribs of the planting groove of the pavement → the template → the concrete pouring → the earthing, and the hole making of a drain hole → the water pipe insertion and drainage → the mortar sealing;
middle step: sixthly, simple scaffolds → anchor pier foundation treatment → anchor pier dowel → anchor pier steel bar and template → anchor pier concrete pouring → anchor cable to be tensioned strongly; seventhly, hanging a reinforcing mesh → spraying concrete → binding mesh beam reinforcing steel → pouring mesh beam concrete;
descending steps: firstly, carrying out weight-reducing excavation on a side slope, selecting pre-splitting blasting or mechanical excavation for the side slope excavation according to the rock weathering degree, reserving an operation space on a slope top, controlling the top width to be 10-15m, and carrying out the excavation according to the following steps of: 1, releasing slope at a temporary slope ratio; excavating the first layer → sealing plain shotcrete → anchoring rods, anchor bar piles and anchor cables → forming holes on the anchoring rods, lowering the rods and the anchor cables, pulling pipes → grouting the anchoring rods, and grouting the anchor bar piles and the anchor cables; excavating a second layer → sealing plain shotcrete → anchoring rods, anchor bar piles and anchor cables → forming holes on the anchoring rods, lowering the rods and the anchor cables, pulling pipes → grouting the anchoring rods, and grouting the anchor bar piles and the anchor cables; excavating the third layer → sealing plain shotcrete → anchoring rods, anchor bar piles and anchor cables → forming holes on the anchoring rods, lowering the anchor rods and the anchor cables → pulling pipes → grouting the anchoring rods, and grouting the anchor bar piles and the anchor cables; excavating the fourth layer → sealing plain shotcrete → anchoring rod, anchor bar pile, anchor cable pore-forming → anchoring rod and anchor cable rope pulling → tube drawing → anchoring rod grouting, anchor bar pile and anchor cable anchor grouting.
The construction items and procedures should be adjusted accordingly according to the design construction items.
The movable crawler-type drilling machine is adopted to construct the anchor rods, the anchor bar piles and the anchor cable holes, so that the time for building the scaffold and the time for moving the drilling machine are saved.
By utilizing the characteristics of high efficiency and convenience in movement of the crawler drills, each crawler drill can be simultaneously responsible for the construction of 3-5 anchor cable holes, the strong wall fixing and waiting time of the anchor cables is utilized, the anchor rod construction operation is alternated, the system supporting and anchor cable hole forming effects are greatly improved, and the time for layered excavation supporting is greatly shortened.
The hole-forming of stock, anchor bar pile adopts with the pipe pore-forming, and the tube drawing after the pore-forming, the inserted bar, and the slip casting is gone on in proper order, ligature PVC pipe on stock, the anchor bar pile, and the hole of blooming, the thick liquid has improved the slip casting quality to peripheral diffusion.
The anchor cable hole forming adopts a method of pipe following and wall fixing, a pipe following hole forming drill bit eccentric expanding drill bit and a P110 special pipe following material are adopted, a straight drill bit hole is used for mortar wall fixing, the drilling tool is circularly advanced, the problems of hole collapse and drill jamming and drilling tool abrasion can be well solved, and the one-time hole forming rate of the anchor cable hole forming is improved.
The anchor cable uses the unbonded anchor cable, so that the quality problems caused by strong unloading cracked stratum fracture communication, slurry leakage and slurry string are avoided.
For improving the grouting quality of the anchoring section, the grouting of the anchoring section is guaranteed to be compact, the complete condition of the rock mass of the anchoring section is identified by using an in-hole camera shooting technology, whether pre-grouting is used or not is determined, and the grouting quality of the anchoring section is effectively guaranteed. According to the anchor cable constructed by the method, grouting at the anchoring section can reach the end standard of the design requirement.
The pouring slurry is mixed by the centralized pulping station, the clean slurry is directly poured into the hole from the centralized pulping station, the cement for mixing is firstly conveyed into a mortar stirrer close to the working surface, and the mixed cement is poured into the anchor cable hole by a mortar pump after being mixed with sand and stirred uniformly on site.
The anchor cable grouting is divided into five stages of grouting, wall fixing grouting, anchoring section pre-grouting, anchoring section grouting, tensioning section grouting and orifice section sealing grouting, and grouting in each stage is different in grouting material, grouting pressure and finishing standard according to different grouting purposes.
And treating the anchor section foundation, and adopting two measures of pouring a cushion layer and increasing the size of the anchor pier to improve the bearing capacity of the anchor pier foundation.
The anchor cable construction process is more, and the cycle is long, with the anchor cable each process share in different step construction, reduced the shared straight line time limit for a project of anchor cable construction, reach the effect of digging down fast.
The above only describes the most typical fractured stratum, if the surrounding rock conditions are good, the hole can be formed by a common drill rod straight drill bit without the need of pipe following hole forming.
In the aspect of grouting control, grouting slurry and grouting control parameters are adjusted according to surrounding rock conditions, pre-grouting can be omitted, and grouting of an anchoring section and a tensioning section can be combined.
On-site selecting mechanical excavation and presplitting blasting two modes according to surrounding rock conditions, reserving enough operation space on the slope top after weight-reducing excavation, controlling the top width at 12m, and pressing 1: 1 temporary slope ratio slope releasing.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The fast supporting construction process for high slope with strong unloading and broken rock features that: the method comprises the steps of excavating and grouting, slope reinforcing and slope shaping, wherein the excavating and grouting is carried out to excavate a slope into step-by-step slopes, after the excavating and grouting of a first step slope is finished, a second step is excavated continuously, the slope reinforcing step of the first step is started, the slope reinforcing step of the first step is finished, the slope reinforcing of the second step and the slope shaping of the first step are carried out, and adjacent steps among the three steps keep a step difference, and three-step assembly line operation is carried out downwards until the construction of all steps is finished.
2. The construction process for the fast support of the strong unloading broken rock high slope according to claim 1, characterized in that: the slope shaping step comprises the steps of pouring a pavement planting groove, covering soil in the planting groove and draining water; the slope surface reinforcing step comprises the steps of pouring anchor piers and grid beams; the excavating and grouting step comprises excavating layer by layer and punching and grouting.
3. The construction process for the fast support of the strong unloading broken rock high slope according to claim 2, characterized in that: pre-splitting blasting, bench blasting and weight-reducing excavation are carried out on each section of slope surface before the excavation grouting step is carried out, an operation space is reserved on the top of the slope after the weight-reducing excavation, the top width is controlled to be 10-15m, and the steps are as follows: 1 temporary slope ratio slope releasing.
4. The construction process for the fast support of the strong unloading broken rock high slope according to claim 2, characterized in that: in the excavation grouting step, four layers are constructed layer by layer: excavation → plain shotcrete sealing → anchor rod, anchor bar pile, anchor cable pore-forming → anchor rod and anchor cable rope laying → pipe drawing → anchor rod grouting, anchor bar pile and anchor cable anchor grouting.
5. The construction process for the fast support of the strong unloading broken rock high slope according to claim 4, characterized in that: the hole forming adopts a method of fixing the wall with the pipe to form the hole, and the anchoring section of the formed hole is subjected to in-hole camera shooting and pre-grouting.
6. The construction process for the fast support of the strong unloading broken rock high slope according to claim 4, characterized in that: the movable crawler-type drilling machine is adopted to construct anchor rods, anchor bar piles and anchor cable holes, the anchor cable uses an unbonded anchor cable, the pouring slurry is mixed by the arranged centralized slurry making station, the clean slurry is directly poured into the holes from the centralized slurry making station, the mortar is firstly conveyed into the mortar stirrer close to the working face, and the mortar is poured into the anchor cable holes through the mortar pump after being mixed with sand on site and stirred uniformly.
7. The construction process for the rapid support of the strong unloading broken rock high slope according to claim 6, wherein the anchor cable grouting is divided into five stages: wall fixing grouting, anchoring section pre-grouting, anchoring section grouting, tensioning section grouting and orifice section sealing grouting.
8. The construction process for the fast support of the high slope with the strong unloading crushed rock according to claim 2, which is characterized in that in the slope reinforcement step: the anchor pier is pour and is included: the method comprises the following steps of simple scaffold → anchor pier foundation treatment → anchor pier dowel → anchor pier steel bar and template → anchor pier concrete pouring → anchor cable to be tensioned strongly; the grid beam pouring comprises the following steps: hanging a steel bar mesh → spraying concrete → binding the steel bars of the grid beam → the template → pouring the concrete of the grid beam.
9. The construction process for the fast support of the high slope with the strong unloading crushed rock according to claim 2, wherein the pouring of the pavement planting groove in the step of slope shaping comprises the following construction procedures: measuring and paying off, inserting the steel bars, erecting the template, pouring concrete, maintaining, planting soil and covering soil.
10. The construction process for the fast support of the high slope with the strong unloading crushed rock according to claim 2, characterized in that the drainage construction in the slope shaping step comprises the following construction procedures: measuring and paying off, constructing drain holes, inserting drain pipes and sealing mortar.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114687361A (en) * | 2021-12-09 | 2022-07-01 | 中国铁建大桥工程局集团有限公司 | Construction method for preventing landslide of side slope at inlet of flood discharge tunnel |
| CN115217130A (en) * | 2022-08-23 | 2022-10-21 | 苏州交通工程集团有限公司 | Safety protection device for reconstruction and extension highway side slope construction |
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| CN115217130A (en) * | 2022-08-23 | 2022-10-21 | 苏州交通工程集团有限公司 | Safety protection device for reconstruction and extension highway side slope construction |
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Application publication date: 20201016 |