CN1022194C

CN1022194C - Superposed hollow building roof and construction method thereof

Info

Publication number: CN1022194C
Application number: CN 88106396
Authority: CN
Inventors: 和景义
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-08-29
Filing date: 1988-08-29
Publication date: 1993-09-22
Anticipated expiration: 2003-08-29
Also published as: CN1032690A

Abstract

The present invention relates to a design and construction technology of a prefabricated cast-in-situ folding hollow slab of a civil construction house made of bricks and concrete. Beams are prefabricated and cast on site according to a T shape, plates are designed according to a continuous hollow plate, the thickness of the bottoms of plates is from 25 to 30, and each plate is prefabricated into a core plate so as to replace a template; each hollow plate is cast at the upper part of each core plate, and a supporting seat negative rib is added while a core tube is withdrawn. The plates, ring beams, beam flanges, ladder platforms, kitchens, toilets and suspended plate balconies do not have extra formworks, have the same elevation, and cast an integral hollow slab for a complete storey synchronously and once. After concrete reaches the strength of 90%, and a keel for supporting a roof is dismounted, and 'lower prefabricating-upper casting' is used for double-layer folding and stressing, so that each storey of a building made of bricks and concrete only has a bricking working procedure and a slab casting working procedure.

Description

Superposed hollow building roof and construction method thereof

The present invention relates to a kind of reinforced concrete hollow floor and the job practices of (the optimum brick mixes the room layer) in the construction work, specifically sandwich hollow slab and job practices thereof.

Up to now, brick-concrete composite buildings generally adopts prefabricated hollow floor, and cassette ceiling hangs on just can go up people's construction, soundproof effect is preferably arranged, and the shortcoming of prefabricated hollow floor is, only floor is prefabricated, beam, collar tie beam, kitchen, lavatory, stair and balcony still need prop up module and cast-in-situ, operation is many, time-consuming taking a lot of work, and especially full superstructure can not same absolute altitude, construction synchronously, nonintegrated structure, poor seismic behavior, and cementation of fissures difficult quality guarantee, plate seam have more ooze, the drainage generation.

Existing superimposed solid slab, though can become whole, thickness is little, h ₀Little, need reinforcing bar more, economical inadequately, rationally, sound insulation is relatively poor.

The object of the present invention is to provide a kind of have can make the holostrome superstructure become integrally-built cassette ceiling, and can make small building unit not have also can to cover seven layers under the situation of crane gear with storied building.

The present invention realizes by following approach: sandwich hollow slab of the present invention comprises the prefabricated rectangle central layer and the cast-in-place hollow layer of concrete on it of " containing main muscle layer " at the bottom of the hollowcore slab, this central layer is prefabricated into the thin central layer of upper surface bristle, hollow concrete layer on it is the continuous hollow plate of smashing at the central layer top-pour with sliding formwork cast in place process flow process, central layer and cast-in-place hollow slab two parts constitute combination stressed sandwich hollow slab, sandwich hollow slab and collar tie beam, flange of beam, the kitchen guarding, the halfpace plate, the all same absolute altitude of hanging deck formula balcony, stack pile, the continuous overlapped hollow floor system of once cast-in-place synchronously formation holostrome.Prefabricated central layer can be the prestressing force commodity member of plant produced.

The job practices of sandwich hollow slab of the present invention, build absolute altitude holostrome wall at the bottom of the plate, the strict behaviour of beam plain cushion mortar, in the room, place the shore frame and the keel of adjustment height, again prefabricated central layer is bearing on wall or the beam, make full floor constitute the big plane of a central layer, place the core pipe from watering end earlier thereon, sliding formwork, begin to water the hollow concrete layer of smashing top, the limit is watered and is smash, the limit adds the negative moment of backing plate muscle, the core pipe is extracted on the limit out, and (the core pipe is by beam and collar tie beam, board support partly waters into solid), retreat to next, so itemize, band moves back between pursuing and waters, treat that concrete strength reaches 90% after, remove shore frame and keel under the plate, promptly constitute the two-layer combination stressed sandwich hollow slab of prefabricated central layer and cast-in-place hollow slab.

The present invention compared with prior art has following advantage: 1. prefabricated central layer is in light weight, be convenient to carrying, manpower can promote in place, can be without crane gear; 2. the cost of integral cover engineering reduces more than 30%; 3. solved the common fault that the prefabricated hollow floor seam oozes, leaks; Since floor be connect, whole and with the same absolute altitude of collar tie beam, once water into integral cover synchronously, anti-seismic performance is good; 5. shorten construction period, reduced the engineering cost 11% of handing over.

Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.

Fig. 1 is the longitudinal sectional view of sandwich hollow slab of the present invention.

Fig. 2 is the transverse sectional view of sandwich hollow slab of the present invention.

Fig. 3 is the transverse sectional view of sandwich hollow slab of the present invention and beam intersection.

Fig. 4 is that the A-A of Fig. 3 is to sectional view.

Fig. 5 is the transverse sectional view of sandwich hollow slab of the present invention and hanging deck formula balcony intersection.

By Fig. 1, Fig. 2, when wall is built at the bottom of the plate absolute altitude, the holostrome wall, beam behaviour plain cushion mortar, in the room, place a shore frame and a top keel of adjustment height, the prefabricated central layer 1 that will contain main muscle 2 is bearing in wall, on the beam, central layer 1 is pressed beam 40-45 millimeter, press 80 millimeters on wall, stay muscle head (its side is not pressed vertical wall), make full floor constitute the big plane of a central layer, on central layer 1, place core pipe 7 from watering end earlier, sliding formwork begins to water the cast-in-place hollow slab 3 of smashing top, the limit is watered and is smash, the limit adds negative moment of backing plate muscle 4, local reinforcing rib, limit are extracted core pipe 7 out and are moved on to new position, water one and move back one, water between end, finish and take out between the end after the pipe operation, returned and watered end, water and smash second, band, until watering complete floor, sandwich hollow slab and collar tie beam 5 and 6, flange of beam, the kitchen guarding, the ladder landing slab, the all same absolute altitude of hanging deck formula balcony, stack pile, the synchronous continuous overlapped hollow floor system of once cast-in-place formation holostrome.After treating that concrete strength reaches 90%, dismountable shore frame and keel, after concrete solidified fully, the central layer 1 and the cast-in-place hollow slab 2 of sandwich hollow slab were combination stressed.

Sandwich hollow slab is by the common theory of computation, strides in getting and the average moment of flexure of bearing is calculated fixed full plate quantity of reinforcement, and bottom central layer 1(is as lifting the every suitable little 2m of area for manpower ², weight is not more than the 130Kg/ piece) and the upper surface bristle.The most handy shockproof extrusion forming process when producing prestressing force central layer 1 with long collimation method, main muscle 2 positions are accurate, and proof stress is just few, discharges stress as far as possible simultaneously, is anti-crack, and steam-cured temperature is suitable low, edge-on and removes, transports and stack.

By Fig. 3, Fig. 4, the design of sandwich hollow slab and beam intersection single-beam, the "T"-shaped beam of pressing ribbed building roof calculates arrangement of reinforcement, and after core pipe 7 passed through, bi section hi watered in the district and is solid slab, control beam natural axis is below the lower edge of compression flange during calculating, under general civilian room load, long 6 meters can replace curved muscle with the ways of strengthening stirrup 8 so that interior common beam is many, bear principal tensile stress, by the multiple of " spacing=garden external diameter of pipe+span " sum, calculate the diameter of decision stirrup 8.

The beam that cast-in-place folded hollow plate is arranged above, by cast-in-place "T"-shaped flexural member design reinforcement,

Calculate the control neutral axis below the lower edge of compression flange, there is negative muscle at continuous slab bearing place, and the plate mid span moment is less, and the plate strain capacity is little.Core pipe 7, is smash cement paste through shake and can be ganged up because central layer 1 surperficial bristle forms a dotted line with prefabricated central layer 1 intersection, makes its superimposed area almost reach 100%, and is identical with prior art " combination solid slab ".So the two-layer superposed surfaces of sandwich hollow slab can not slided yet.

By Fig. 5, hanging deck formula balcony 9, calculate arrangement of reinforcement with commonsense method, replace the hanging deck bed die with short central layer, negative main muscle can stretch into arbitrarily and bend in the room in the cast-in-place hollow slab 3, with the II type support of adjustment height, keel calculate decision with the lumps of wood, channel-section steel, pipe, keel spacing by checking the construction loading as far as possible on full building central layer 1 time top.

Claims

1, a sandwich hollow slab, it comprises: hollowcore slab is contained central layer and the in-situ layer on it that the bottom of main muscle is prefabricated into, it is characterized in that: the in-situ layer on it is the continuous cassette ceiling that adopts the cast-in-place one-tenth of sliding formwork cast in place process, and it and prefabricated central layer constitute sandwich hollow slab jointly; Sandwich hollow slab and the collar tie beam, flange of beam, kitchen guarding, halfpace plate, all same absolute altitude of hanging deck formula balcony, stack pile that need not formwork, the continuous overlapped hollow floor system of once cast-in-place formation holostrome synchronously.

2, sandwich hollow slab according to claim 1 is characterized in that: prefabricated central layer is the prestressing force commodity member of plant produced.

3, a kind of job practices of sandwich hollow slab, at first in the room, place the shore frame and the keel of adjustment height, again prefabricated central layer is bearing on wall or the beam, make full floor constitute the big plane of a central layer, it is characterized in that: place core pipe, sliding formwork from watering end earlier thereon, begin to water the hollow concrete layer of smashing top, the limit is watered and is smash, the limit adds the negative moment of backing plate muscle, and the core pipe is extracted on the limit out, retreats to next; Move back between so itemize, band pursue and water, treat that concrete strength reaches 90% after, remove the keel of shore frame, promptly constitute the two-layer combination stressed sandwich hollow slab of prefabricated central layer and cast-in-place hollow slab.