CN105971302A - Prestressed concrete hollow floor slab reinforcing structure and construction method thereof - Google Patents

Abstract

The invention discloses a prestressed concrete hollow floor reinforcement structure and a construction method thereof, comprising a cavity, an observation hole, a grouting tunnel, a steel bar and a grouting material; several grouting tunnels and the locations of the grouting tunnels are opened on the upper surface of the hollow floor It is located directly above the cavity in the hollow slab, and the grouting channel communicates with the cavity; steel bars are provided in the cavity, and the cavity is filled with grouting materials; The observation hole and the observation hole are located directly above the cavity and communicate with the cavity. The invention adopts core filling to strengthen the prestressed concrete hollow floor, which is easy to operate, has less wet work on site, does not affect the life of residents, has a remarkable reinforcement effect, can greatly improve the safety of the reinforced floor, and has the same life span as the structure, and can produce huge economic and social benefits.

Description

A prestressed concrete hollow floor reinforcement structure and its construction method

technical field

The invention belongs to the field of building reinforcement, and relates to general building reinforcement and a construction method thereof, in particular to a prestressed hollow floor reinforcement structure and a construction method thereof.

Background technique

With the advancement of urbanization and the adjustment of industrial structure, urban construction is developing rapidly. A large number of existing industrial and civil buildings can no longer meet the needs of modern functions. It is imminent to renovate and utilize these existing buildings. Many of the existing buildings adopt brick-concrete building structure. In this type of building, the prestressed concrete hollow floor is the main form of the floor. Prestressed concrete hollow-core slabs in existing buildings, especially those produced by rural prefabrication factories, are mostly non-standard prestressed concrete hollow-core slabs. There are problems such as: non-standard specifications and sizes of hollow-core slabs; non-standard number and diameter of steel bars; The phenomenon of "many but nothing" such as finding the manufacturer and having no technical information is serious. In addition, with the passage of time, the components are under high pressure for a long time, the creep of concrete and the stress relaxation of steel bars will seriously reduce the reliability of prestressed concrete hollow slabs. It is imminent to carry out corresponding inspection, maintenance and reinforcement of the floor. As shown in Figures 1 and 2, it is an unreinforced prestressed concrete hollow slab, and the cavity 1 is in the hollow slab.

At present, the most common reinforcement techniques for prestressed concrete hollow slabs in engineering include: enlarging section reinforcement method, bonded steel reinforcement method and carbon fiber reinforcement method, etc. The basic idea of the method of increasing section is to use the same material to increase the cross-sectional area of the relevant components or structures of the existing structure to increase the bearing capacity and meet the requirements of normal use under new conditions. The construction of the enlarged section method is relatively complicated, the construction period is long, and the workload of wet work on site is large, which will have a great impact on the normal life of users. The basic idea of the bonded steel reinforcement method is to bond the steel plate to the bottom of the prefabricated floor slab with a high-performance epoxy adhesive, so that the steel plate and the concrete form a unified whole. The bonded steel reinforcement method has strict requirements on the anchorage length at the end, which needs to meet the specification requirements. In the specific reinforcement, it is difficult to meet the required anchorage length due to the restriction of the two ends of the plate by the plate end support; in addition, the bonded steel reinforcement effect is in the To a large extent, it depends on the gluing process and operation level, which requires a relatively high technical level of the construction team. The basic idea of the carbon fiber reinforcement method is to paste carbon fiber cloth on the bottom of the prefabricated floor to increase the bearing capacity. Carbon fiber is high-strength and light-weight, has strong tensile strength and elastic modulus carbon fiber density, and hardly increases the structural weight. Like the bonded steel reinforcement method, the effect of carbon fiber reinforcement depends to a large extent on the bonding process and operation level, which requires relatively high technical level of the construction team, and the strength of carbon fiber is high, and improper end treatment is prone to peeling damage.

Contents of the invention

The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, and provide a prestressed concrete hollow slab reinforcement structure and a construction method thereof, which can effectively solve the insufficient bearing capacity of prestressed concrete hollow slabs and further improve the prestressed concrete hollow slab reinforcement structure. Flexural capacity of stressed concrete hollow-core slabs.

The technical solution adopted in the present invention is: a prestressed concrete hollow floor reinforcement structure, including a cavity, an observation hole, a grouting channel, steel bars and grouting materials;

The upper surface of the hollow floor slab is provided with several grouting channels, and the position of the grouting channels is located directly above the cavity in the hollow floor slab, and the grouting channels communicate with the cavity;

The cavity is provided with steel bars, and the cavity is filled with grouting material;

Observation holes are provided on both sides of the hollow floor slab and on the upper surface of the mid-span. The observation holes are located directly above the cavity and communicate with the cavity.

Preferably, the length and width of the grouting channel are such that the steel bars can be conveniently placed in the cavity of the hollow floor slab. The quantity of steel bars put in can be determined according to the required increased bearing capacity of the hollow-core slab.

The above-mentioned construction method of a prestressed concrete hollow floor slab reinforcement structure comprises the following steps:

(1) At the construction site, first cut a grouting channel of a certain length and width along the direction of the cavity on the surface of the prefabricated hollow floor to be reinforced, and reserve observation holes on both sides and in the middle of the span;

(2) Clean up the cavity, and then put the steel bar into the cavity of the hollow floor slab through the opened grouting channel;

(3) Inject the grouting material through the grouting channel where the steel bars are placed, and observe the filling of the grouting material through the observation hole;

(4) Vibrate and compact the grouting material, and then perform curing. When the grouting material reaches the predetermined curing time, the reinforced hollow floor can be put into normal use.

When reinforcing in the present invention, the steel bar is put into the cavity of the prestressed concrete hollow slab through the channel opened on the upper part of the hollow slab, and the grouting material is injected through the channel opened on the upper part of the hollow slab, and it is vibrated and compacted for curing to reach the predetermined curing time Ready to use. The scheme is simple to operate, requires less on-site wet work, is safe and reliable, has obvious effects, does not affect residents' lives, and has low reinforcement costs.

Beneficial effects: the present invention adopts core filling to strengthen the prestressed concrete hollow floor, which is easy to operate, less on-site wet work, does not affect the life of residents, has a remarkable reinforcement effect, can greatly improve the safety of the reinforced floor, and the reinforcement effect has the same service life as the structure. Can produce huge economic and social benefits.

Description of drawings

Fig. 1 is the schematic diagram of unreinforced prestressed concrete hollow floor;

Fig. 2 is A-A sectional view among Fig. 1;

Fig. 3 is the schematic diagram of the prestressed concrete hollow floor slab reinforced by filling the core of the present invention;

Fig. 4 is a B-B sectional view in Fig. 3 .

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 3 and 4: a prestressed concrete hollow floor reinforcement structure, including a cavity, an observation hole 3, a grouting tunnel 2, a steel bar 4 and a grouting material 5; the upper surface of the hollow floor is provided with several grouting tunnels 2 1. The position of the grouting channel 2 is located directly above the cavity in the hollow slab, and the grouting channel 2 communicates with the cavity; the cavity is provided with steel bars 4, and the cavity is filled with grouting materials 5; both sides of the hollow slab An observation hole 3 is also provided on the upper surface of the mid-span, and the observation hole 3 is located directly above the cavity and communicates with the cavity.

The above-mentioned construction method of a prestressed concrete hollow floor slab reinforcement structure comprises the following steps:

(1) At the construction site, first cut a grouting channel 2 of a certain length and width along the direction of the cavity on the surface of the prefabricated hollow floor slab to be reinforced, and reserve observation holes 3 on both sides and in the middle of the span;

(2) The cavity is cleaned, and then the reinforcing bar 4 is put into the cavity of the hollow floor slab through the opened grouting tunnel 2;

(3) inject the grouting material 5 into it through the grouting channel 2 where the steel bar 4 is placed, and observe the filling situation of the grouting material 5 through the observation hole 3;

(4) Vibrate and compact the grouting material 5, and then perform curing. When the grouting material 5 reaches the predetermined curing time, the reinforced hollow floor slab can be put into normal use.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, within the scope of the principles and technical ideas of the present invention, various changes, modifications, replacements and deformations to these implementations still fall within the protection scope of the present invention.

Claims (2)

1. a pre-stressed concrete hollow floor ruggedized construction, it is characterised in that: include cavity, observation port, grouting Duct, reinforcing bar and grouting material；

Described cassette ceiling upper surface offers several grouting ducts, the position in grouting duct is positioned at cassette ceiling internal cavity Surface, and duct of being in the milk communicates with cavity；

It is full of grouting material in being provided with reinforcing bar, and cavity in described cavity；

The upper surface of described cassette ceiling both sides and span centre is further opened with observation port, the position of observation port is positioned at just going up of cavity Just and communicate with cavity.

The construction method of a kind of pre-stressed concrete hollow floor ruggedized construction the most according to claim 1, its feature exists In: comprise the following steps:

(1) at the construction field (site), first a fixed length is cut out at prefabricated hollow floor upper surface to be reinforced along cavity direction Spend and the grouting duct of width, and both sides and span centre reserve observation port；

(2) cavity is cleared up, then by being opened grouting duct, reinforcing bar is put in the cavity of cassette ceiling；

(3) by placing the grouting duct of reinforcing bar by grouting material injection wherein, and filling of grouting material is observed by observation port Truth condition；

(4) grouting material is vibrated, closely knit, carry out maintenance subsequently, treating that grouting material reaches predetermined curing time will The cassette ceiling reinforced can put into normal use.