① Clean the anchor pile head? Do a good job in waterproof construction of anti-floating anchor together with waterproof construction of building foundation? Yeah, bolts that pass through the waterproof layer of the bottom plate? One layer of permeable crystalline waterproof material and two layers of polymer coiled material for waterproof treatment?
② The exposed anchor head is made of anticorrosive resin? Mortar hole sealing? Is the bearing plate coated with antirust paint and asphalt material? Rust prevention? Antiseptic treatment?
Matters needing attention in construction
(1) Should the anchor body be free from damage? Will it be suspected?
② Anchor body selection test? Basic test? Acceptance test quality requirements, etc. Should be strictly in accordance with the relevant norms? Program? Do not operate blindly? To avoid danger?
(3) The cement slurry in the anchor hole should have enough curing time? Do not move the anchor during curing?
(4) When the design is different from the actual situation on site? Get the consent of the design unit? Can be adjusted as appropriate?
Application of anchor rod
Bolt is the most basic part of roadway support in contemporary coal mines. It strengthens the surrounding rock of roadway and makes it self-supporting. At present, anchor rods are not only used in mines, but also in the engineering technology of strengthening slopes, tunnels and dams. As a tensile member that goes deep into the stratum, the anchor rod has one end connected with the engineering structure and the other end goes deep into the stratum. The whole bolt is divided into free section and anchoring section. The free part refers to the anchor head ... Read the full text >:>
Introduction of bolt composition
There are several factors that make up the anchor rod: ① The tensile strength is higher than that of the rock and soil rod. (2) One end of the rod can be in close contact with the rock and soil to form friction (or bonding) resistance. ③ The other end of the rod outside the rock and soil can form radial resistance to the rock and soil. Action principle: As a tensile member that goes deep into the stratum, the anchor rod has one end connected with the engineering structure and the other end goes deep into the stratum. The whole bolt is divided into free section and anchorage section, so you can read the full text freely >>
Brief introduction to the function of anchor rod
Anchor rod is a bar system structure reinforced by rock and soil. Through the longitudinal tension of the anchor rod, the shortcoming that the tensile capacity of rock and soil is much lower than the compressive capacity is overcome. On the surface, the separation between rock and soil and the original body is limited. Macroscopically, the cohesiveness of rock and soil is increased. From the mechanical point of view, it is mainly to improve the cohesion c and internal friction angle φ of surrounding rock. In essence, the anchor rod is located in the rock and soil, forming a new complex with the rock and soil. This complex ... Read the full text >>
Classification introduction of anchor rod
(1) wooden anchor. There are two kinds of wooden anchors used in China, ordinary wooden anchors and compressed wooden anchors. The following are several names of anchor rods.
(2) steel bar or steel wire rope mortar anchor. Cement mortar is used as an adhesive between anchor and surrounding rock.
(3) Inverted wedge-shaped metal anchor. This kind of anchor was once one of the most widely used anchor forms. This kind of anchor rod has a certain anchoring force in a certain range because of its simple processing and convenient installation. & gt
Basic situation of bolt support
Bolt support is a kind of reinforcement and support method used in surface engineering such as slope and deep foundation pit, and underground cavern construction such as tunnel and stope. The pole column made of metal sheet, wood chip, polymer sheet or other materials is driven into the pre-drilled hole in the surface rock mass or the rock mass around the cavern, and the special structure of the head and the pole body and the tail support plate (or not) are used, or the surrounding rock is combined with the stable rock mass by bonding to produce suspension. & gt
Historical development process of bolt support in the world
19 1 1 year, Freeden coal mine in Aberschleshing, Guo Guan, used rock bolt to support roadway roof for the first time; 19 18, Guo Guan Xilixian mine was supported by anchor cable for the first time, and then the application scope of anchoring technology began to expand; 1934 in the heightening project of Cheurfas dam in Algeria, 10000kN prestressed anchor rod was used as the anti-overturning anchor rod for the first time, which is ... read the full text >>
The Historical Development Process of Bolt Support in China
At the end of 1950s, bolt support technology began to be applied in China. At that time, there were Jingxi Mining Bureau, Longyan Iron Mine in Hebei Province and Xiangtan Manganese Mine in Hunan Province. The mine roadway is supported by wedge-shaped bolt. In the 1960s, China began to use anchoring technology in railway tunnels, slope engineering, reservoir dams and underground engineering, except mine roadways. 1964, Anhui Meishan Reservoir adopted 30m-47m prestressed anchorage for the first time ... Read the full text >:>
Suspension theory of bolt support
LouisA Panek published the suspension theory of 1952 to 1962. Suspension theory holds that the function of bolt support is to suspend the weak rock stratum on the upper stable rock stratum. For layered rock mass exposed in mining roadway, the direct roof is prone to bending, sinking and deformation. If the bolt is pressed in time and hung on the main roof, the direct roof will not be separated from the main roof ... Read the full text >:>
Composite beam theory of bolt support
According to the theory of composite beam, there are many layered roofs in the roadway roof, which can be regarded as a kind of beam with two sides of roadway as fulcrums, and this rock beam supports the upper rock load. The layers are "bound" into a complete composite beam with anchor rods to prevent rocks from sliding along the layers and avoid delamination of the layers. Under the load of overlying strata, the maximum bending strain and stress of this thick composite beam will be greater than that of a simple composite beam ...
Combined arch theory of bolt support
The theory of compound arch was put forward by Tarang and Pender through photoelastic experiments. According to the principle of combined arch, when prestressed anchor is installed in the fractured zone of surrounding rock of arched roadway, the compressive stress will be distributed conically at both ends of the rod body. If the distance between the anchor rods arranged around the roadway is small enough, the compressive stress of each anchor rod is staggered, so that the rock strata around the roadway form a continuous combined area. & gt
How to ensure the construction quality of guardrail
Standard construction procedures for guardrail construction quality: construction conditions → accurate lofting → roughening of contact surface and adjustment of embedded steel bars → fabrication and installation of steel bars → formwork installation → concrete pouring → formwork removal → sanitary quality control: 1. Before each installation, the template should be cleaned and coated with release agent, which should be evenly coated. 2, guardrail steel welding and binding should comply with the design and specification requirements, especially the internal reinforcement position should be accurate. 3. Check the template after installation ... Read the full text >>
What problems may occur in the construction of fire shutter?
Problems in the construction of fire shutter 1. Unreliable fire protection of the box: in the inspection of fire shutter products, fire shutter is generally installed on the side. When testing, the box is behind the fire, so there is no threat of fire. The test results also reflect the fire integrity and heat insulation performance, while the fire resistance limit of the box part is usually ignored. The box should be made of steel, but the types of steel materials and fire protection requirements are not further specified. And a real fire shutter bag ... Read the full text >>
What is the construction process of changing squatting toilets into toilets?
Process:
1, squat to the toilet, first measure the distance from the sewer center to the wall. Buy a toilet at this distance. Don't buy the so-called squat toilet, pick a siphon toilet with the right hole spacing.
2. Before installing the toilet, be sure to test whether the sewer pipe is unblocked. Solution: fill a bucket of water, pour the whole bucket of water into the sewer quickly, and pay attention to whether the water level in the sewer rises. If there is a rise, we must first thoroughly dredge it. Only if it doesn't rise will it be qualified ... Read the full text >>
Requirements for the construction of plastic runways? What are the characteristics of plastic runways?
Requirements for the construction of plastic runways?
1. Surface pretreatment On the basis of meeting the requirements, the surface of particles used for plastic raceways should be cleaned with butyl ester first, and there should be no stolen goods, dust, water (including watermarks) and oil stains. After cleaning, apply primer evenly on the foundation (evenly mix thinner and glue according to the ratio of 3-4: 1) to enhance its adhesion to the ground and avoid irreparable consequences.
2. There are two kinds of construction techniques for construction classification, machine ... Read the full text >>
Reconstruction construction scheme of plastic runway plastic runway materials
Reconstruction construction scheme of plastic runway
1. Remove the garbage in the site, make basic inspection and make records in the above way, clean up the accumulated water, dry it, and then blow off the dust in the site with a hair dryer; Clean the batching and mixing site and keep the glue around the batching site clean.
2. Brush off the mud points and lime points in the site with a wire brush;
3. Remove indelible lime, cement and protruding parts with hammer and drill, and then blow the whole site ... Read the full text >>
How to construct the plastic runway? What is a plastic runway?
How to construct the plastic runway?
1. Seam: the seam is smooth and beautiful. The dresser should check the thickness and flatness at any time.
2. Ingredients: strictly implement the process formula issued by the company's technical department, and the ratio is accurate.
3. Paving: Before paving, check whether the foundation is flat, take corresponding measures, and carefully pave according to the construction sequence to ensure the thickness.
4. Trimming: Trimming by designated technicians. When joining hard edges, it should be adjusted according to the slope. When joining soft edges, please read the full text >>.
What is the price per square meter of plastic runway? What should be paid attention to in the construction of plastic runway?
What is the price per square meter of plastic runway?
1. There are several kinds of plastic runways, such as composite plastic runways, mixed plastic runways, all-plastic plastic runways and prefabricated plastic runways. The price of each material is different. Among them, the quality of the mixed plastic track is good, but it depends on what venue you use here. If it is used in mountainous areas, it is best to use a composite plastic runway.
2. Specific price ... Read the full text >>
How to make a plastic runway? Construction technology of plastic runway?
How to make a plastic runway?
1, color: special polyurethane particles, soft surface color, particle surface, preventing the reflection of dazzling sunlight, beautiful and durable, and can be used with multi-colors.
2. Economical: easy to maintain and save the cost of treatment.
3. Safety: It can prevent sports injuries caused by falling.
4. Adhesion: special construction treatment, strong adhesion, can inhibit the rise of moisture, no bubbles, peeling.
5. Smoothness: ... Read the full text >>
Composite plastic runway offer? Construction technology and matters needing attention of composite plastic runway?
Composite plastic runway offer? The price of new materials in the composite plastic runway market is about 65,438+000 yuan /m2, and if the materials are included in the contract, it is 65,438+045 yuan /m2. (excluding basic expenses), the price of the mixed plastic runway is cheap, and the packaging material is 120 yuan/m2. The specific price will change due to the construction area and construction environment. Friends in need can recommend to the physical store for detailed consultation. Composite plastics ... Read the full text >>
What are the construction methods of plastic runway? What are the precautions in the construction of plastic runway?
Construction method of plastic runway
1. During construction, the garbage in the site should be removed first, and then the foundation inspection should be carried out and recorded. After the accumulated water is cleaned and dried, the dust in the site will be blown off with a hair dryer. Clean the batching plant and keep the glue around the batching plant clean.
2, you can use a wire brush to remove dirt and lime spots on the construction site; Use a hammer and drill to remove the indelible lime, cement and protruding parts, and then you need to ... read the full text >>