CN1211545C

CN1211545C - Construction method of cast-in-situ prestressed concrete hollow floor slab

Info

Publication number: CN1211545C
Application number: CN 01102940
Authority: CN
Inventors: 朱其聪
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-03
Filing date: 2001-02-03
Publication date: 2005-07-20
Anticipated expiration: 2021-02-03
Also published as: CN1368585A

Abstract

A construction method of a cast-in-situ prestressed concrete hollow floor slab comprises the following main steps: 1. manufacturing prestressed reinforcements, 2, manufacturing a floor slab mold base plate in situ according to a conventional method, 3, pre-burying a support frame for placing the prestressed reinforcements on a wall body, 4, installing the prestressed reinforcements, 5, placing and manufacturing hollow pipes, and 6, pouring concrete according to a conventional method. The steel consumption and the concrete consumption of the hollow floor slab poured by the method are respectively reduced by more than half, the self weight of the floor slab is reduced by 1/3, the anti-seepage effect is good, and the power-assisted performance of the whole anti-vibration structure is strong; therefore, the prefabricated slab has the advantages of the prestressed hollow prefabricated slab and the advantages of a cast-in-place concrete solid floor slab.

Description

The job practices of cast-in-situ prestressed concrete cassette ceiling

The present invention relates to a kind of job practices of cast-in-situ prestressed concrete floor, particularly the job practices of cast-in-situ prestressed concrete cassette ceiling at the construction field (site).

In industry and civilian construction structure, floor adopts two-way concrete slab to arrange two kinds of cast-in-place solid floor and pre-stress hollow precast plates more, and a kind of before it is the cast-in-situ floor that two-way concrete slab is arranged, cost height, floor are from heavy, and project organization needs a large amount of reinforcing bars configurations; Thereafter a kind of is the pre-stress hollow precast plate, cost reduces, when but construction is combined into floor, must spread in the above and add cement mortar screeding, increased floor from heavy, the 2nd, water resistance is very poor, and often the seepage phenomenon appears in break joint between prestressed slab and plate, and the overall structure power-assisted is little, shockproof effect is poor.

The objective of the invention is to: at the construction shortcoming of above-mentioned traditional two kinds of ways, provide a kind of and reduce the engineering overall cost, can alleviate the floor deadweight again, and can antiseep and the job practices of the cast-in-situ prestressed concrete cassette ceiling of antidetonation.

For this reason, the job practices of the present invention's cast-in-situ prestressed concrete cassette ceiling comprises following key step:

1. make prestressed reinforcement;

2. now make the floor baffle plate according to a conventional method;

3. the bearing support of pre-buried placement prestressed reinforcement on body of wall;

4. prestressed reinforcing bar; Prefabricated prestressed reinforcement is positioned on the bearing support and the welding jail, makes it to become one, in each end 200mm～400mm, respectively place three reinforcing bars and tie, make it to constitute the net piece with former reinforcing bar with the perpendicular direction of former prestressed reinforcement with bearing support;

5. lay and make hollow tubing; Earlier lay 3～5 tubing supports on the axis between per 2 prestressed reinforcements on the template, on this support, putting hollow tube and hollow tube is sealed at both ends again, also can not emptying core barrel material and put the round tubing of other solid lights;

6. fluid concrete according to a conventional method.

For this reason, the job practices of the present invention's cast-in-situ prestressed concrete cassette ceiling has the following advantages:

1. steel use amount and concrete amount reduce over half, floor weight reduction load 1/3 respectively; 2. adopt integrated pouredly, antiseep is good, integral quakeproof structure power-assisted is strong.Thereby, both had pre-stress hollow precast plate floor from heavy and light, strong point that cost is low, have the advantage that cast-in-situ concrete solid floor antiseep is good, integral quakeproof structure power-assisted is strong again.

Below, the feature to the job practices of the present invention's cast-in-situ prestressed concrete cassette ceiling is described further in conjunction with the accompanying drawings and embodiments.

Fig. 1: now making the status architecture schematic diagram to be poured of having laid prestressed reinforcement and a plurality of tubing bearing support and hollow tube on the floor baffle plate in the job practices of cast-in-situ prestressed concrete cassette ceiling of the present invention.

Fig. 2: the branching bolster structure of prestressed reinforcement and built-in process schematic diagram;

Fig. 3: hollow tube bearing support and hollow tube structural representation;

Fig. 4: the special-purpose pallet structural representation of prestressed reinforcement.

Embodiment one:

A kind of job practices of cast-in-situ prestressed concrete cassette ceiling, it comprises following key step:

1. make prestressed reinforcement at the scene;

2. now make the floor baffle plate according to a conventional method;

5. lay and make hollow tubing; Earlier lay 3～5 tubing supports on the axis between per 2 prestressed reinforcements on the template, on this support, putting hollow tube and hollow tube is sealed at both ends again, also can not emptying core barrel material and put the round material of other solid lights;

6. fluid concrete according to a conventional method.

Above-mentioned construction proceed to the 5. the state after the step referring to Fig. 1, among Fig. 1～Fig. 4: 1 is the special-purpose transportation of prestressed reinforcement pipe support, 2 are transportation pipe support disk, 3 are transportation pipe support support, 4 for making hollow hollow tube, and 5 is the tubing support, and 6 is body of wall prefabricated section or collar tie beam, 7 for placing the bearing support of prestressed reinforcement, and 8 is prestressed reinforcement.

In the present embodiment, joining the bearing support 7 that buries the placement prestressed reinforcement on body of wall is the angle steel (referring to Fig. 2) that have some grooves above, each groove size is 9 * 9mm～12 * 12mm, spacing is decided by designing requirement between each groove, be generally 55～110mm, be welded with the stiffener that length is 100～120mm at two of angle steel, its built-in process can be pre-buried in prefabricated floor structure preformed bricks 6, also can be pre-buried when cast-in-place collar tie beam frid, when pre-buried, wall upper surface 30mm is exposed on one side of angle steel band groove, one side the concrete pouring direction of stretching to cast-in-place collar tie beam frid of stiffener.

The hollow tubing 4 of described manufacturing is for moulding hollow tube firmly, and its radius R is 90～100mm, and length L equals to design 90% of standard width of a room in an old-style house axis length; Described tubing support 5 is that an inner arc radius is to add stent foot under the semicircular gripper shoe of r to constitute, stent foot have three, its height h be 15～30mm, (referring to Fig. 3), the value of gripper shoe arc radius r is consistent with the tubing radius R, be generally 90～100mm, can with two length the reinforcing rib of n on the gripper shoe semicircle limit, apart from decide, being generally 15～30mm, the material of making tubing support 5 can also can be hard plastic board or other materials with same effect with the reinforcing bar line to the length of n with pipe.

As a kind of conversion of the embodiment of the invention, the hollow tubing 4 of described manufacturing also can be the hollow tube or the round solid tubing of lightweight of other materials.

A kind of conversion as the embodiment of the invention, can not want for the 1. step yet, the 2. carry out earlier, 3. step, again each reinforcing bar line is placed on the bracing frame, the stretch-draw instrument that has equal effect with stretch-draw jack or other to this reinforcing bar line carry out stretch-draw, apply behind the prestressing force again with the two ends of prestressed reinforcement by the present invention 4. step carry out, make it closely to fuse with the prestressed reinforcement bearing support.

Embodiment two:

A kind of job practices of cast-in-situ prestressed concrete cassette ceiling, 1. all the other are all identical with embodiment one step except that for the key step that it comprises, institute's difference is: described prestressed reinforcement is after being prefabricated in the factory, be placed on the special-purpose transportation of the prestressed reinforcement pipe support 3 and transport to the job site, the special-purpose transportation of described prestressed reinforcement pipe support is made of round steel pipe support 1 and termination disk 2, the length of round steel pipe support 1 is decided with the length of the prestressed reinforcement that the design standard width of a room in an old-style house requires, be positioned on the excircle of termination disk 2 at steel pipe support 1 two ends and have some grooves of laying prestressed reinforcement, the size of this groove is 90～120mm (referring to Fig. 4).During installation, earlier prestressed reinforcement is installed in one by one on the bearing support 7 and welding jail, unloads from the special-purpose transportation of prestressed reinforcement pipe support 3 again after making it to become one with bearing support 7.

Claims

1, a kind of job practices of cast-in-situ prestressed concrete cassette ceiling is characterized in that: this job practices may further comprise the steps:

1. make prestressed reinforcement;

2. now make the floor baffle plate according to a conventional method;

6. fluid concrete according to a conventional method.

2, the job practices of cast-in-situ prestressed concrete cassette ceiling as claimed in claim 1, it is characterized in that: described step 1.: making prestressed reinforcement can make at the scene, also can be to be placed on after being prefabricated in the factory on the special-purpose transportation of the prestressed reinforcement pipe support to transport to the scene.

3, the job practices of cast-in-situ prestressed concrete cassette ceiling as claimed in claim 2, it is characterized in that: described prestressed reinforcement special-purpose transportation pipe support (3) is made of round steel pipe support (1) and termination disk (2), the length of round steel pipe support (1) is decided with the length of the prestressed reinforcement that the design standard width of a room in an old-style house requires, be positioned on the excircle of termination disk (2) at steel pipe support (1) two ends and have some grooves of laying prestressed reinforcement, the size of this groove is 9 * 9mm～12 * 12mm.

4, job practices as claim 1 or 2 or 3 described cast-in-situ prestressed concrete cassette ceilings, it is characterized in that: described step 3.: the bearing support (7) of pre-buried placement prestressed reinforcement is the angle steel that has some grooves above on body of wall, each groove size is 9 * 9mm～12 * 12mm, spacing is 55～110mm or decides by designing requirement between each groove, two ends at angle steel is welded with the stiffener that length is 100mm～120mm, its built-in process can be pre-buried in prefabricated floor structure preformed bricks, also can be pre-buried when cast-in-place collar tie beam frid, when pre-buried, wall upper surface 30mm is exposed on one side of angle steel band groove, one side the concrete pouring direction of stretching to cast-in-place collar tie beam frid of stiffener.

5, the job practices of cast-in-situ prestressed concrete cassette ceiling as claimed in claim 4, it is characterized in that: the hollow tubing (4) of described manufacturing is to mould the hollow tube that hollow tube or other material are made firmly, its radius (R) is 90～100mm, and length (L) equals to design 90% of standard width of a room in an old-style house axis length.

6, the job practices of cast-in-situ prestressed concrete cassette ceiling as claimed in claim 5, it is characterized in that: described tubing support (5) is to add stent foot under the semicircular gripper shoe of an inner arc radius (r) to constitute, the value of arc radius (r) is consistent with the radius (R) of making hollow hollow tube or solid tubing (4), be generally 90～100mm, gripper shoe can be with two reinforcing ribs (n) on the semicircle limit, (n) length is 15～30mm, stent foot has three, its height (h) is 15～30mm, and the material of making tubing support (5) can also can be hard plastic board or other materials with the reinforcing bar line.