precast-tech

On November 21st, the national concrete price index recorded 90.

47 points, a month on month decline of 0.

33% and a year-on-year decline of 19.

Lifting Socket

47%.

The national market has entered the traditional off-season, and the overall market is characterized by generally weak demand and weak prices, with significant regional differentiation.

In the north, demand has shrunk significantly due to low temperatures, while in the south, prices are difficult to support due to insufficient demand or weather factors.

The specific demand and price situation in each region are as follows:.

Immediately stop tensioning: Remove the oil pressure as soon as possible and stop all tensioning operations.

Ferrule Loop Insert

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With the acceleration of urbanization, urban surface hardening has led to a decrease in rainwater infiltration capacity, causing environmental problems such as waterlogging and a decrease in groundwater level.

Therefore, building “sponge cities” has become a goal for more and more cities.

Plastic Rebar Chairs

Permeable concrete, as a new type of eco-friendly building material, has a special pore structure that can effectively discharge surface water, alleviate urban heat island effect and waterlogging, and has been widely used in urban roads, squares, parking lots and other projects.

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Self compacting concrete was first proposed by Japanese scholar Okamura in 1986.

Its excellent workability, flowability, and uniformity are significant characteristics of self compacting concrete (SCC).

SCC can use its own gravity to fill the formwork without compaction or vibration, and the hardened surface is relatively smooth and flat.

Coarse aggregates usually account for 28% to 35% of the volume of SCC, significantly affecting its performance.

PVC Chamfer

The rheological properties of self compacting concrete are largely influenced by the characteristics of coarse aggregates, including shape, particle size, gradation, surface features, etc.

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2.

Swift Lift Foot Anchor

Construction slump requirement: 180mm~220mm;.

The blindness of construction, the asynchronous construction of the same individual project, and the large time difference in the formation of concrete structures in different parts have caused uneven settlement of the overall project and the formation of cracks.

Swift Lift Clutches

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The phenomenon of partial mixing water floating to the surface of concrete during the setting process, accompanied by the sinking of granular materials, after pouring and vibrating the concrete mixture, is called bleeding.

A small amount of bleeding on the surface of concrete is a normal phenomenon and has no effect on the properties of the concrete mixture and after hardening.

However, excessive bleeding can bring many adverse consequences.

Metal Rebar Caps

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It is reported that the lifting project of precast concrete columns for the 1 # three-dimensional warehouse undertaken this time has opened up a new field for the lifting of large warehouse concrete columns, breaking the weight record for lifting.

This hoisting of precast columns is different from the previous hoisting.

The traditional towers are mostly steel cylindrical structures, with uniform materials, concentrated center of gravity and regular shape; The precast concrete columns lifted this time have a large single weight (average weight of about 192 tons per column) and a long length (up to 40.

6 meters), which belong to brittle material components.

PVC Chamfer

The surface is easily damaged and the internal stress is uneven.

In addition, the precision requirements for the reserved lifting points of the columns are extremely high.

Once the stress deviation occurs, it is easy to cause cracking, and the requirements for lifting stability and synchronization far exceed those of the tower.

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Steel Rebar Chairs

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The main processes include: measurement and setting out, steel bar correction, hoisting of the next floor staircase, construction of vertical precast components, sealing construction, grouting construction, binding of internal shear wall steel bars, installation of internal wall formwork, binding of external wall connection node steel bars, installation of external wall formwork, installation or lifting of protective frames, installation of horizontal formwork and supports, hoisting of horizontal composite (beam) slabs, hoisting of balconies and air conditioning panels, installation of water and electricity pipelines, binding of horizontal steel bars, and concrete pouring.

The key construction processes of precast shear wall structures include: surveying and setting out, vertical precast component construction, sealing construction, grouting construction, installation of exterior wall formwork, installation of horizontal formwork and supports, lifting of horizontal composite (beam) slabs, binding of horizontal steel bars, and pouring of concrete.

The construction plan for the precast standard layer is detailed in Attachment 1.

The specific project schedule and process arrangement need to be adjusted based on the type and quantity of precast components.

Spread Anchor

The logical relationship between the 17 main sub processes is as follows:.