Requesting a special safety construction plan for high roadbed slopes

Contents

1. Project overview

2. Basis for preparation

3. Construction technical plan

4 , Hazard factors and countermeasures

5. Safety management measures

6. Emergency rescue plan

7. Civilized construction site construction

8 , Safety Funding Investment Plan

Special Construction Plan for Safety of Roadbed High Slope Project

1 Project Overview

The C5 contract is an important part of Pengwu Expressway and is An important transportation port in the northeast of Pengshui County, starting from K12+700 and ending at K16+000, the main line is 3.3 km long, crossing Changtan Township and Baojia Town, starting at Guanyuliang (K12+700), and going down through Zhongshan Temple Tunnel (ZK13+720.5, YK13+715.5), goes up from Yujiang 2# Bridge (ZK14+256, YK14+277), passes through Changtan Interchange (K14+712.84), and ends at Yujiang 3# Bridge (K15+615) Mayukou Village, Changtan Township (K16+000).

Basic situation table for treatment and protection of high slopes in this contract section

Length of starting and ending stations (m) Maximum height difference (m) Adopt protection form

LK1+ 100~+400 300 15~25 Anchor frame protection

II. Basis of preparation

1. "Regulations on Production Safety Management of Construction Projects" Order No. of the State Council of the People's Republic of China

No. 393.

2. "Technical Specifications for Construction of Highway Bridges and Culverts" (JTJ041-2000)

3. "Technical Specifications for Construction Safety of Highway Engineering" (JTJ076-95) of the Ministry of Communications

1. Subgrade construction plan for deep excavation section

1. Detailed review of the engineering geological data of the deep excavation section before construction, including earth-rock boundaries and rock strata Weathering thickness and degree of fragmentation, structural characteristics of rock formations, etc. Based on the on-site inspection and design requirements, a detailed construction organization design will be prepared and submitted to the supervision engineer for approval before implementation.

2. Accurately calculate the excavation line at the top of the cutting according to the slope ratio and step width of the designed cross-section.

Use a total station for stakeout, and place cutting slope piles according to the on-site slope elevation.

3. Release the cutting excavation line according to the slope piles, and clean the surface and debris.

4. If major geological changes are found during excavation, the construction will be stopped, the engineering geological survey will be re-carried out, and the construction plan will be revised based on the new geological data. It will be implemented after reporting to the supervision engineer

for approval. Due to the large amount of deep cutting work, complex construction environment, high technical requirements, and difficult construction

it is a key project to control the progress of the project and must be carefully organized and scientifically constructed.

5. Stone excavation

The excavation method for stone excavation is determined based on the type of rock, degree of weathering and degree of joint development. For soft rocks and strongly weathered rocks that can be excavated mechanically, mechanical excavation will be used. For stones that cannot be directly excavated mechanically, blasting operations will be used. Before the stone blasting operation, based on the terrain geology, excavation section and construction machinery equipment, prepare an implementation blasting design and construction plan, submit it to the supervision engineer for approval, and strictly follow the supervision engineer's instructions. The stone part is excavated using the deep hole multi-row differential blasting method. When the road cutting is long and deep, longitudinal excavation should be carried out in layers. Each layer should first dig out a channel, and then excavate both sides, so that each layer has an independent excavated road and temporary drainage system; for weathered and broken rock mass In order to ensure the stability of the slope and slope protection during construction, the excavation is carried out in a stepped manner, and the platform is set according to the height required by the design to form a stepped slope. During excavation, 2-3m of the side slope shall be reserved, smooth blasting or pre-split blasting shall be used, and the slope shall be brushed manually.

6. Slope control plan

In order to ensure the stability of the slope and avoid over-excavation and under-excavation, smooth blasting is used on the slope. Joint cracks are more developed in areas and in some areas. Pre-splitting blasting is used in special areas. The construction of deep cuttings follows the principles of graded excavation, graded protection, and timely protection. The first level of excavation is protected by one level. When the next level is excavated, the upper level has already taken protective measures.

Attention should be paid to masonry slope protection:

(1) The mortar is controlled and measured by the gravimetric method and mechanically mixed. The masonry is built using the sitting mortar method in layers and in accordance with the specifications. .

(2). Manually process and chisel large pieces of relatively flat stone to build the exterior of the protective wall

and process the corner stones for building settlement joints. , the corner stones should be processed neatly, and the two faces should be perpendicular to each other.

(3). The settlement joints of the slope protection are set according to the requirements of the design drawings. Corner stones are used to build the settlement joints.

They are processed neatly to ensure that the settlement joints are perpendicular to the horizontal plane and the width is up and down after they are built. consistent.

(4) During the masonry process and within 7 to 14 days after the completion of the masonry, maintain the health of the masonry at any time

and keep its surface moist.

(5) When constructing the anchor slope protection, try to be perpendicular to the inclination of the rock formation on the rock slope, use a chisel

rock machine to drill holes into the stable rock formation area, and insert the anchor rod. Anchor with cement mortar to connect the slope rock mass

and the rocks that may slide with the bedrock as a whole.

(6) Before drilling the anchor bolt, determine the hole location and mark it according to the design requirements and the rock condition of the slope.

The error of the anchor hole spacing should not exceed 15cm. The hole distance error of the stress anchor cable shall not exceed 20cm, and the deviation angle between the drilling axis of the pre-stress anchor cable and the design axis shall not be greater than 3. , the depth error of the cement mortar anchor hole is not greater than +50cm, the hole diameter of the cement mortar anchor is 15mm larger than the diameter of the rod body, the hole diameter of the resin anchor and fast hardening cement coil anchor is 42mm, and other anchors meet the design requirements.

(7). The cement anchor rod body should be straight, rusted and decontaminated. Use medium-fine sand with a small particle size

less than 2.5mm. Screen the mortar mix before use. Ratio: cement: sand = 1:1~1:2 (weight ratio),

The water-cement ratio is 0.38~0.45.

(8) When grouting starts or stops for 30 minutes beyond the edge, use water or dilute cement slurry to lubricate the grouting tank and its pipelines. During grouting, Insert the grouting pipe 5~10cm away from the bottom of the hole, and pull it out slowly and uniformly as the mortar is injected.

(9) The anchor cable must be cut strictly according to the designed size, with no damage on the surface and rust and contamination removed. When arranging steel wires or steel strands, install the exhaust pipe, and each isolation steel wire or steel strand should be arranged along the axis of the anchor cable

Straight and aligned, every 1.0~ 1.5m Set up an isolation frame or inner core pipe. If necessary, set up a centering bracket. The anchor cable body should be tied firmly with non-galvanized materials.

(10) Before the construction of anchor protection, dangerous rocks in the anchor blasting operation area should be carefully inspected and treated to ensure the safety of

the construction team members. When the slope is seriously broken, spray first For rear anchors, the spray thickness should be no less than

5cm. During the spraying operation, a dedicated person should be assigned to follow and observe the slope conditions. The anchor construction should be carried out 3 hours after the final setting of the sprayed concrete. The construction power lines and switches should be equipped with electric shock protection facilities. Develop safe operating procedures for the operation of construction machinery and provide safety education to construction personnel. Non-construction personnel are not allowed to enter the construction area. The working platform used for construction is firm and reliable and equipped with safety guardrails.

II. High-fill embankment construction plan

In order to ensure the filling quality and slope stability of the high-fill embankment, the following construction plan is specially formulated

:

1. Accurately release the toe of the embankment according to the designed cross-section and the overfill width required by the specification.

2. After removing the topsoil, compact it in a timely manner to achieve a compaction degree of more than 90%. If the foundation strength

does not meet the specification requirements, please instruct the supervision engineer to carry out the work in a timely manner. deal with.

3. When the cross slope of the ground is steep, the construction shall be organized according to the design drawings of the longitudinal and transverse joints of the subgrade to prevent longitudinal and transverse cracks in the subgrade filling.

4. When filling soil, strictly control the loose thickness of each layer to no more than 30cm, and the control is optimal

The moisture content deviation is ± 2%, strictly follow the test results Perform compaction using the recommended compaction method. If the sources of filler are different and their properties are quite different, they should be filled in layers instead of in sections or longitudinally. The thickness of the filling layers of different materials should not be less than 50cm.

5. Strictly control the quality of the filler. Materials with poor water permeability should not be used for roadbed filling.

It is strictly prohibited to be used for roadbed bottom filling.

6. When filling, the entire section should be filled in layers, continuously compacted, and vigorously vibrated and rolled to prevent uneven settlement and cracking of the roadbed.

Only after the lower layer passes the inspection and acceptance by the supervision engineer can the upper layer be filled.

3. General construction safety technical measures

Stone blasting operations and the management, processing, transportation, use, inspection,

and destruction of blasting equipment Must strictly abide by the country's current "Explosion Safety Regulations" and actively accept the supervision and management of the local public security department. Smooth blasting should strictly control the drill hole spacing and explosive dosage. When operating construction machinery, in addition to operating according to specifications, it should also follow a pre-designed walking route. Its working position should be flat and stable, and should be commanded by a dedicated person. The commander is not allowed to enter the working range of the machinery. The excavation of high slopes shall be carried out "with excavation, reinforcement and protection", and construction shall be carried out in strict accordance with the design plan. Workers constructing high slopes must wear safety helmets and fasten safety belts. The ropes tied to safety belts should be firmly tied to reliable safety stakes. The ropes should be vertical. Two or more safety stakes must not be tied to the same safety stake. rope or tie more than 2 people to a safety rope. Safety passages should be set up during high-side breaking construction; the excavation working surface should be staggered with the loading operation surface, and upper and lower crossing operations are strictly prohibited. When someone is working on the top of the slope, no one is allowed to stay or pass below the slope. When clearing protruding rocks on the slope and trimming the slope, the process should be carried out from top to bottom. Loose soil and stones on the slope must be removed in time. It is strictly prohibited to work, rest or store machinery under dangerous rocks. If signs of mountain sliding or collapse are found during construction that endanger construction safety, the construction should be stopped immediately, personnel and machinery should be evacuated, and reports should be reported to the Supervision Office and the Headquarters for handling. The treatment of the landslide section should be carried out from the two sides of the landslide body to the middle part from top to bottom, and comprehensive trench excavation is strictly prohibited. During construction, special personnel should be assigned to observe and strictly prevent landslides. Operations should be stopped when encountering severe weather such as heavy rain, heavy snow, heavy fog, and strong winds above Level 6 (including Level 6). If there is a road underneath a high-slope embankment, warning signs should be set up during construction.

When construction machinery operates close to the edge of the embankment, a necessary safety distance should be left

according to the height of the embankment, and there should be a dedicated person to command. The commander is not allowed to enter the working range of the machinery.

Warning signs should be set up underneath the spoil and on roads where rolling rocks threaten the area, and vehicles and pedestrians should be prohibited from passing underneath during operations.

When discarding slag, there should be a dedicated person to direct the mechanical transport vehicle. The transport vehicle should not unload the slag directly on the edge of the slope top. It should unload the slag at a certain safe distance from the edge of the slope top, and then be pushed out of the edge by a bulldozer or loader.

IV. Special safety construction measures

1. Construction must be in accordance with design specifications.

2. Strict operating procedures must be followed during operations.

3. Preparation for roadbed construction

(1) Equipment equipment, excavator, loader, bulldozer, sheep's foot roller, grader

, road rollers, dump trucks, cables, lighting equipment, leakage protectors.

(2) Equipped with safety protective equipment, including whistles, helmets, red and green flags, warning signs, signs

signs, red warning lights, and barbed wire.

4. Check before starting:

Excavators, loaders, bulldozers, sheep's foot mills, graders, road rollers, dump trucks

Whether dump trucks are in Good condition, whether all brakes are effective, and whether the cables are exposed or leaking

.