What is the function of setting vertical PVC pipes on the wall under concrete windows?

Insert PVC pipes in the cross-section (transverse or vertical) of concrete beams, generally reserved holes, to avoid damage to concrete strength or accidental damage to steel bars in the future. In this case, the height of the indoor space is generally small, the clearance height at the bottom of the beam is not enough, if the pipeline passes through the bottom of the beam, it will affect the use of the clearance height (such as the floor 3000, the beam height is 700, and the fire D 100 pipeline is installed below, the wire tray, etc.), if the ceiling is also to be set up, the clearance under the ceiling is too small, which affects the use of height, or the visual sense is not good. At this time, the design arranges some equipment to pass through the beam to facilitate the spatial layout, and the pipe hole is inserted in the beam in advance.

The vertical cracks of the shear wall are very bright, the main reason for the vertical cracks is the stress concentration caused by the volume shrinkage of the concrete, when the stress is greater than the strength of the concrete, it will lead to the cracking of the shear wall, the cracks are vertical, through the joints, and will widen with the age of the concrete, the growth of strength, how to avoid itThere is a requirement in the specification that expansion joints should be set up in the shear wall, that is, in the place where the stress may be concentrated, cut off, so that the single-sided wall is not so long, reduce the volume change caused by self-shrinkage, and reduce the stress. When the structure does not allow expansion joints, add expansion agent to the concrete to compensate for shrinkage and reduce the volume change of concrete

The concrete wall is fixed with a large formwork, and through-bolts should be used, and the PVC pipe is used for through-bolts. The bolt is pulled out when the mold is removed.

I've interned on construction sites and I've seen this happen, and I think there are two possibilities.

1: It may be used for ventilation and heat release on exterior walls.

2: But what I see the most is that when beating concrete, because the tie formwork has to be pulled from both ends, the pull tab is passed through the pipe, so that the pipe stays in it when the formwork is taken.

For supporting the formwork, wear bolts, and block it with mortar after dismantling.

Because the wire pipe is embedded in the wall for wire threading, there is usually a casing pipe for water supply, strong and weak electricity, gas, etc., and the tie rod when the concrete wall support formwork, as well as a reserved hole to set up the pipe.

Two situations: one is the electrical pipe, which is embedded in the concrete wall. There is also a kind of through the wall, which is used for the needs of civil engineering fixed formwork, and civil engineering will be supplemented later.

Some PVC pipes are lighting buried pipes, and some are used for tension screw perforation when installing the template.

It is recommended to avoid, do not damage the load-bearing structure, if it is really impossible to avoid, it is also best to pre-embed a small-diameter PVC pipe, so as to ensure that the steel structure inside the load-bearing wall is not damaged.

If the wall pipe is not added in advance, once the pipeline needs to be installed, it will be very difficult to punch holes and penetrate the pipe on the wall after pouring concrete forming, which is time-consuming and time-consuming, and increases the decoration cost. (Your high school physics teacher will answer for you).

1. Product introduction: The product is made of polyvinyl chloride PVC resin as the main raw material, adding special additives, extrusion and injection molding processing of wire pipes and accessories, mainly used for electrical threading. 2. Product features 1, compressive resistance:

The wall thickness of the pipe is above and can withstand the pressure of more than 750N, so it can be installed in the concrete or can be installed in the concrete, and will not be damaged by compression. 2. Impact resistance and heat resistance: In the process of concrete pouring, it will not break when subjected to normal tamping impact, and it will not be soft under the condensation effect during the construction process.

3. Moisture-proof acid and alkali resistance: it will not rust, and the joints of each side are bonded with PVC adhesive according to the regulations, which can be waterproof and infiltrate into the pipe, with better moisture resistance, and is more suitable for use in corrosive environments. 4. Heat and fire resistance

The PVC electrical casing is self-extinguishing (it will self-extinguish within 30 seconds from the flame), and the flame will not spread along the pipe. 5. Convenient construction: the pipe cutter can be cut off lightly, and the corresponding special spring is inserted in the wire pipe, which may be bent to the required angle at will at room temperature, and the wire pipe can be quickly and easily connected into the pipe of the required shape in construction.

The new industry code stipulates that JDG pipes in general buildings can completely replace PVC pipes and SC pipes. The quality of pipes, fittings, wire boxes and installation quality that meets the requirements of the specification can be exempted from the crossover grounding wire. PVC pipes can only be used in civil buildings below Class 2, and PVC pipes cannot be used in fire protection systems, emergency power supply systems, important electrical circuits, electrical circuits below the ground and places with high requirements for the strength of building structures.

In principle, PVC pipes should be used preferentially in places with strong corrosion such as humidity and acid, alkali, etc., but for dark laying, JDG and PVC can be, see Chapter VIII of JGJ 16 Civil Electrical Design Code for details. I just watched it too! Hope it works for you!

Yes, we're using JDG.

1. The difference between PVC pipe and PU pipe: in terms of footwear, PVC leather is mostly used in lining or non-weight-bearing parts, or in the manufacture of children's shoes; PU leather can be applied to the fabric of footwear or to the parts that bear weight. In terms of bags, the more applicable is Sun Zhi PVC leather.

This is because the items in the bag are different from the feet worn in shoes and do not emit heat; You don't have to bear your personal weight. The difference between PU and PVC is relatively easy, and the base fabric of PU is much thicker than PVC from the corners, and there is also a difference in the feel, and the feel of PU is softer; PVC has a harder feel; It can also be burned with fire, and the taste of PU is much lighter than that of PVC. 2. The difference between the appearance of PE pipe and PVC pipe:

PVC and PE both belong to olefins, PVC is polyvinyl chloride, which is the strongest of the three major olefins, and PE is polyethylene, which is divided into three types: low-density polyethylene, high-density polyethylene and linear low-density polyethylene. Gas pipes and easy to connect, can be connected by hot melt welding, the connection strength is better than its own strength, the PE pipe made of raw materials is white, non-toxic, can be used as a water supply pipe, can be bent, and is commonly used in rural areas, such as drinking water projects, water-saving irrigation and other projects. PVC pipes are not recommended to be used as water supply pipes, and are commonly used in farmland irrigation projects and urban drainage projects.

If the wall tile should be able to put down the pipe, if it is a small pipe for the wall, the ceiling is wrapped with electrical tape and directly into it, which may not be very standardized, but many people do this, the ceiling is generally equipped with lights, the power is not large, and the double plastic copper wire is used.

In support of the first floor, I would like to add that if the concrete wall is not deep enough, you can cut off part of the back of the box, and it will not affect the installation of sockets and switches, and if you don't use PVC pipes, you can use yellow wax pipes.

Concrete wall slotting can generally enter the wall depth centimeter can not affect the steel bar, as long as the width is larger, the flat cloth wire can not be used for the line pipe, or with a flat square line duct instead of line pipe. As for the wire box, the depth is only centimeters, and it is generally easy to avoid steel bars. You can try it and you'll know.

Slotting is not allowed.

It is recommended to use PVC gusset which is only more than 1 cm thick and only open the protective layer! Water pipes won't be enough unless you have a renovation outside to thicken the walls.

It's time to do the embedded pipe. Slotting is not easy. It's very labor-intensive and not easy to deal with. In addition, it is possible to reduce the damage of secondary structures, you can take a look at the specification. The wires on the ceiling without a suspended ceiling are generally buried. Very few are exposed.

If you can't avoid it, just add a layer of gypsum board to the wall, and the line pipe cassette is done.

It should be done with embedded pipelines, and many internal 30 mm steel bars can be seen, which is not easy to deal with. It is recommended to use a very flat wiring duct to be buried in the surface plaster, and the switch box is slotted in the part that does not have reinforcement.