CN103895098A

CN103895098A - Process for forming vibration and extrusion process prestressed concrete pipe through core mold vibration method

Info

Publication number: CN103895098A
Application number: CN201210576642.7A
Authority: CN
Inventors: 曹生龙
Original assignee: TIANJIN ZEBAO CEMENT PRODUCTS CO Ltd
Current assignee: TIANJIN ZEBAO CEMENT PRODUCTS CO Ltd
Priority date: 2012-12-27
Filing date: 2012-12-27
Publication date: 2014-07-02

Abstract

The invention provides a process for forming a vibration and extrusion process prestressed concrete pipe through a core mold vibrator. An inner mode and an outer mold which are completely installed are hoisted to be arranged on the core mold vibrator in a sleeved mode together so that a model and the core mold vibrator can be tightly attached to each other through locking devices. A feed hopper is arranged above the model, the core mold vibrator is started and conducts feeding while vibrating till the model is filled with concrete mixtures, and then other procedures are completed. According to the process, the vibration and extrusion process prestressed concrete pipe is formed by the core mold vibrator which is high in vibration intensity and good in vibration effect, quality of the prestressed concrete pipe can be improved, production cost can be reduced, the environment can be protected, and the waste residue discharge can be reduced.

Description

Utilize the technique of core mould vibrating method moulding one-phase prestressed concrete pipe

Technical field:

The invention belongs to the making moulding process of prestressed concrete pipe road class, particularly a kind of technique of utilizing core mould vibrating method moulding one-phase prestressed concrete pipe.

Background technology:

Prestressed concrete pipe has good anti-cracking function and bearing capacity, can be used for high overburden layer pipeline and use simple and easy basis.Prestressed concrete pipe construction install convenience, speed is fast, the duration is short, mainly uses region material---sand, stone, cement, thereby pipe is cheap.Concrete material is corrosion-resistant, and long service life can reach a century, outclass the metal pipe material that steel or cast iron materials are made, and earthquake resisting performance is good, can lays application in macroseism area, thereby be widely used in the aqueducts such as urban water supply, water conservancy water delivery, agricultural irrigation, industrial and mining enterprises' water.

One-phase prestressed concrete pipe (being called again vibration-extrusion technique prestressed concrete pipe) is a kind of tubing being most widely used in prestressed concrete pipe.Compared with other technique prestressed concrete pipes, there is the advantages such as body overall performance quality is good, material usage is economized, technique is simple, operation is few, with short production cycle, cost is low, be the maximum a kind of tubing of consumption in China's aqueduct.

Producing now one-phase prestressed concrete pipe manufacture craft is both at home and abroad: (as shown in Figure 1, 2)

A. model assembling: model comprises external mold 1, internal mold 2, rubber pattern 3 and spring bolt 4.Put into framework of steel reinforcement, external mold 1 is assembled, stretch-draw longitudinal prestressing reinforcing bar;

B. the external mold 1 of having assembled is set on upright internal mold 2;

C. inside and outside mould together handling to (see figure 2) on shake table;

D. above model, load onto feeding hopper 6;

E. Vibration on Start-up platform 8, vibration limit, limit feeding, until concrete mix is full of model;

F. fill it up with model 7 handlings of material to maintenance hole, connect toward the sebific duct of rubber pattern 3 water-filling pressurizations;

G. be forced into authorized pressure toward the interior water-filling of rubber pattern, logical steam curing strengthens concrete;

H. concrete reaches after desired strength, stops steam curing, sheds rubber pattern internal water pressure, hangs out external mold and prestressed concrete pipe, and external mold is removed in Zhe Mo district, and prestressed concrete pipe is through the production process that has been up to the standards.

Original production process adopts shake table formation of concrete body, and shake table vibration frequency is generally 1500rpm.Because vibration frequency is low, oscillation intensity is little, moulding dry concrete can not vibrate, the concrete slump need be more than 6cm, and the body tube wall with shake table making is thin like this, body long, the one-phase prestressed concrete pipe of upright moulding produces following number of drawbacks:

1, can only vibration moulding plastic concrete mixture, in forming process, easily to flow and be covered with pipe die, the vibration moulding time greatly shortens.But the concrete after moulding flows, degree is large, and concrete enters protective layer from tube core through steel wire, and the expansion amount of gum cover and model is increased, and the skin that heals up seam tensor also increases.Cause skin seam running pulp, make compressor wire easy-to-rust herein.

2, gum cover and external mold expansion amount increase, and pipe ovality increases, and bellmouth working face processing capacity strengthens, and are difficult for guaranteeing outward appearance and the dimensional tolerance after bellmouth ground.

3, residual water content increases, and increases the loss of prestress after prestressed concrete pipe vibration-extrusion process completes.Concrete is wriggled simultaneously, has destroyed the linking intensity of protective layer and structure sheaf, easily produces protective layer hollowing.

4, the loss of prestress in steam-cured process is large, needs to increase quantity of reinforcement 15% left and right, increases product cost.

5, in concrete, amount of water is many, for guaranteeing that concrete strength need increase cement consumption, the corresponding product cost that increases again.

6, upright cast vibration plastic concrete on shake table, is easy to laminated segregation, and socket end stone is few, cement slurry volume is large, and concrete strength is low, the easy ring crack of socket.

7, plastic concrete mobility is large, easily running pulp, and the tube exterior of making is of poor quality.Voids and pits cavity, surface is many.

8, internal diameter expansion is large, and faucet section is placed restrictions on by socket mould, and tensor is little, and socket section tensor is large, causes the upper and lower inner diameter deviation of body large, rear port place is installed and forms step, and flowing water resistance strengthens.

9, inwall hole is recessed many, out-of-flatness.

10, concrete density is low, holds not at socket end, reduces body impermeability.

The various quality problems that one-phase prestressed concrete pipe exists are in sum substantially all relevant with use shake table moulding process.

Summary of the invention:

Object of the present invention is just to overcome above-mentioned the deficiencies in the prior art; and provide a kind of technique of utilizing core mould vibrating method moulding one-phase prestressed concrete pipe; this core mould vibrating device that technology utilization oscillation intensity is large, vibrating effect is good carrys out moulding one-phase prestressed concrete pipe; can improve prestressed concrete pipe quality, reduce production costs, protection of the environment, reduce waste sludge discharge amount.

As above design, technical scheme of the present invention is: a kind of technique of utilizing core mould vibrating device moulding one-phase prestressed concrete pipe, the external mold that assembling is completed is set on upright internal mold, it is characterized in that: the inside and outside mould installing together handling is put on core mould vibrating device, model and core mould vibrating device are fitted tightly by locking device, above model, load onto feeding hopper, start core mould vibrating device, vibration limit, limit feeding, until concrete mix is full of model, then complete other every operations.

Process of the present invention is owing to adopting core mould vibrating device to substitute the existing vibrator using, vibration frequency and oscillation intensity are improved, thereby can use dry concrete mixture, thereby a series of defects of can only vibration moulding plastic concrete mixture bringing due to shake table are overcome.The segmentation of core mould vibrating device and internal mold upper, middle and lower fit tightly, and pass effective, the upper and lower vibration uniformity that shakes, thereby upper and lower concrete quality are even, overcomes every quality problems such as prestressed concrete pipe top concrete density is low, intensity difference.

Accompanying drawing explanation:

Fig. 1 is one-phase prestressed concrete pipe model schematic diagram;

Fig. 2 is the artwork that adopts shake table moulding one-phase prestressed concrete pipe;

Fig. 3 is artwork of the present invention.

The specific embodiment:

As shown in Figure 1,3: utilize the technique of core mould vibrating method moulding one-phase prestressed concrete pipe, carry out according to following steps:

A. model assembling: model comprises external mold 1, internal mold 2, rubber pattern 3 and spring bolt 4.Put into framework of steel reinforcement, external mold 1 is assembled, stretch-draw longitudinal prestressing reinforcing bar (see figure 1);

B. the external mold 1 assembling being completed is set on upright internal mold 2, and connects with spring bolt 4;

C. inside and outside mould together handling to core mould vibrating device, make model 7 and core mould vibrating device 9 fit tightly (see figure 3) by locking device;

D. above model, load onto feeding hopper 8;

E. start core mould vibrating device, vibration limit, limit feeding, until concrete mix is full of model; Core mould vibrating device is by Motor Drive vertical axis, some groups of eccentric blocks are installed on axle, vibro-core mould and internal mold are locked by locking device, in the time that motor rotates, eccentric block rotates and produces centrifugal force, by locking device, vibration is passed to internal mold, inner mould vibration makes the full model of concrete fluidized flow, reaches the object of building formation of concrete body.

F. fill it up with the model handling of material to maintenance hole, connect toward the sebific duct of rubber pattern 3 water-filling pressurizations;

H. concrete reaches after desired strength, stops steam curing, sheds rubber pattern internal water pressure, hangs out external mold and prestressed concrete pipe 5, and external mold is removed in Zhe Mo district, and prestressed concrete pipe is through the production process that has been up to the standards.

Claims

1. one kind is utilized the technique of core mould vibrating device moulding one-phase prestressed concrete pipe, the external mold that assembling is completed is set on upright internal mold, it is characterized in that: the inside and outside mould installing together handling is put on core mould vibrating device, model and core mould vibrating device are fitted tightly by locking device, above model, load onto feeding hopper, start core mould vibrating device, vibration limit, limit feeding, until concrete mix is full of model, then complete other every operations.