CN216359659U - Demoulding system of UHPC short floor - Google Patents

Abstract

A demoulding system of UHPC short ribbed slab mainly solves the technical problem of difficult demoulding of the manufactured panel. The key points of the technical scheme are as follows: the demoulding system comprises a pneumatic demoulding system, a hoisting system and a synchronous jacking system; the hoisting system comprises a pre-buried hoisting connection device (81) and a hoisting connection device (82), the pre-buried hoisting connection device (81) comprises an annular steel bar (811) and an internal thread sleeve (812), one end of the annular steel bar (811) is connected with one end of the internal thread sleeve (812), the pre-buried hoisting connection device (81) penetrates through and is connected with two ends of a UHPC (ultra high performance concrete) short rib precast slab in a UHPC short rib precast slab die, the hoisting connection device (82) comprises a hanging bracket (821) and a connecting beam (822), and the hanging bracket (821) is a frame formed by longitudinal beams (8211) and cross beams (8212) and is relatively balanced in stress. It is mainly used for demoulding the bridge deck.

Description

Demoulding system of UHPC short floor

Technical Field

The utility model relates to a demoulding system of UHPC low rib plates.

Background

The bridge deck directly bears vehicle load and environmental action, and is the most direct member affected by adverse factors such as overload, corrosion, fatigue and the like, so the working state of the bridge deck directly affects the durability and the driving comfort of the main structure of the bridge. Orthotropic steel bridge deck slabs and common concrete bridge deck slabs are two main bridge deck slab forms applied to bridge engineering at present. Ordinary concrete bridge deck slab can adapt to bituminous concrete bridge floor pavement or cement pavement betterly, and the driving effect is better, nevertheless because ordinary concrete tensile strength is on the low side, leads to its thick great, and the structure dead weight is great, is difficult to adapt to the demand of large-span bridge, and is easy to split near wet seam, hogging moment district, suspension cable anchor region. The orthotropic steel bridge deck has the advantages of light dead weight, large ultimate bearing capacity, short construction period and the like, and is widely applied to large-span bridges, but the orthotropic steel bridge deck operating for years is easy to generate diseases such as fatigue cracking, pavement damage and the like due to the low rigidity of the steel bridge deck, poor cohesiveness with asphalt concrete, poor deformation coordination performance and the like.

The ultra-high performance concrete (namely UHPC) has the advantages of high elastic modulus, high compression resistance, high tensile strength, good creep property and the like, can reduce the size of a structure, lighten the self weight of the structure, improve the effectiveness of the load resistance of the structure and increase the spanning capacity. Therefore, the ultra-high performance concrete bridge deck based on the ultra-high performance concrete performance research and development can avoid the difficult problems of fatigue cracking and easy pavement damage of orthotropic steel bridge deck, can reduce the self weight of the structure, adapts to the requirement of a large-span bridge, can solve the difficult problem of easy cracking of a common concrete bridge deck by the ultra-high performance concrete with excellent tensile performance, and has good durability.

At present, the rapid construction technology of prefabricated assembly in the bridge construction field is vigorously researched, developed and applied by the nation and the industry; similarly, technologies of prefabrication production, installation construction and the like of bridge deck structures applying the ultra-high performance concrete are gradually developed and begin to be applied; however, due to the lack of corresponding experience in the aspect of ultra-high performance concrete precast bridge deck in China, the corresponding template manufacturing, installation and the like are not mature enough. In addition, the standard ultra-high performance concrete bridge deck slab prefabricated part is generally in a cuboid structure (a step form exists at the edge wet joint part); according to the installation requirement of actual engineering, the prefabricated components of the ultra-high performance concrete bridge deck slab generally need to have ribs on four joint surfaces around. Besides the connection strength between the new concrete and the old concrete can be enhanced by the aid of the steel bars, and the connection strength between the new concrete and the old concrete can be further enhanced by arranging the rough surface on the surface of the prefabricated member. Correspondingly, when the surface of the ultra-high performance concrete needs to be ribbed, the concrete side template needs to be reserved with rib penetrating holes (through holes) for the reinforcing steel bars to penetrate through and comprises the template joint, and slurry leakage can be caused. Meanwhile, the ultra-high performance concrete can be bonded with the template after being cured, and the volume of the cured concrete expands, so that the demolding is difficult due to the factors, and the template can be easily damaged due to the fact that the mold needs to be strongly demolded by great working strength.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a demoulding system for UHPC short rib plates, which is rapid and has high finished product efficiency.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the demoulding system comprises a pneumatic demoulding system, a hoisting system and a synchronous jacking system of the UHPC short rib prefabricated plate mould; the pneumatic demoulding system comprises a slot die 33, more than one rib bottom plate 37, UHPC concrete 336 and a compressed air supply system; the groove mold 33 is a trapezoid cross section composed of a groove bottom surface 332, a groove inclined surface 334 and a groove top surface 333, namely the cross section composed of the groove bottom surface 332, the groove inclined surface 334 and the groove top surface 333 is a trapezoid, the groove bottom surface 332, the groove inclined surface 334 and the groove top surface 333 are trapezoidal, the trapezoid surface can include two groove bottom surfaces 332, two groove inclined surfaces 334 and a groove top surface 333, more than two trapezoid cross sections form the groove mold 33, an air groove 331 and an air vent 335 are arranged in the groove bottom surface 332, compressed air can be introduced from the air vent 335, the rib bottom plates 37 are symmetrically arranged and cover the groove bottom surfaces 332, the length of the rib bottom plates 37 is less than that of the groove bottom surfaces 332 of the groove mold 33, the length of the rib bottom plates 37 is greater than that of the air groove 331 of the groove mold 33, the width of the rib bottom plates 37 is greater than that of the air groove 331 of the groove mold 33, UHPC concrete 336 is precast, and an air-actuated PC cavity is composed of the groove bottom surfaces 332, the rib bottom plates 37 and UHPC concrete 336 in the length direction, after the UHPC concrete is prefabricated to reach the strength, compressed air is supplied by the vent hole 335 to support the rib bottom plate 37, and after an adhesive layer between the groove inclined surface 334 and the groove top surface 333 and the UHPC concrete is damaged, the UHPC prefabricated plate is separated from the groove mold 33; the hoisting system comprises an embedded hoisting connection device 81 and a hoisting connection device 82, the embedded hoisting connection device 81 comprises an annular steel bar 811 and an internal thread sleeve 812, one end of the annular steel bar 811 is connected with one end of the internal thread sleeve 812, and the embedded hoisting connection device 81 is embedded in the rib bottom plate 37 of the UHPC low-rib precast slab, namely the annular steel bar 811 is completely poured in the UHPC low-rib precast slab; one end of the internally threaded sleeve 812 connected with the annular steel bar 811 is poured in the UHPC short-rib precast slab, and the other end of the internally threaded sleeve 812 is parallel to the upper end face of the UHPC short-rib precast slab, namely, the end face of the internally threaded sleeve 812 is on the same horizontal plane with the upper end face of the UHPC short-rib precast slab, so that the internally threaded sleeve 812 can be connected by a connecting beam 822 to ensure that the UHPC short-rib precast slab can be hoisted for use, the hoisting connecting device 82 comprises a hanging bracket 821 and a connecting beam 822, and the hanging bracket 821 is a frame formed by longitudinal beams 8211 and cross beams 8212 and is relatively balanced in stress.

The die of the pneumatic demoulding system of the UHPC short-rib prefabricated plate die further comprises a die and a rib bottom plate 37, the die comprises a groove die 33, convex surfaces are arranged on the groove die 33, the cross section of each convex surface is trapezoidal, rib bottom grooves are formed by combining every two convex surfaces, air grooves 331 are formed in the rib bottom grooves and can be filled with air, the rib bottom plate 37 is placed on and covers the grooving surfaces of the air grooves 331, and therefore the rib bottom plate 37 and the air grooves 331 form pneumatic cavities.

The length of the air groove 331 arranged in the groove bottom surface 332 of the groove die 33 is 10 mm-100 mm smaller than the length of the groove bottom surface 332 of the groove die 33, the groove depth of the air groove 331 is 0.1 mm-5.0 mm, and the groove width is 0.5 mm-5.0 mm.

The length of the rib bottom plate 37 is 5 mm-100 mm less than the length of the groove bottom surface 332 of the groove die 33.

The compressed air supply system comprises a system compressed air connecting pipeline, an air supply main valve 337, connecting air pipes of all vent holes 335 of the single UHPC prefabricated plate are connected in parallel with an outlet pipe of the air supply main valve 337, the air supply main valve 337 is opened, and all air cavities arranged on the single UHPC prefabricated plate supply air simultaneously.

The hanger 821 of the utility model is a rectangular framework which has larger strength and rigidity and is similar to the shape of a UHPC (ultra high performance concrete) low rib plate, and is spliced by a longitudinal beam 8211, a cross beam 8212 and a connecting rod, wherein the longitudinal beam 8211 is parallel to the long side of the UHPC low rib plate and is arranged between two embedded hoisting connecting devices 81 of longitudinal row embedded hoisting points. A cross beam 8212 is arranged perpendicular to the longitudinal beam 8211 and extends out of the precast slab from each end.

One end of the steel bar is provided with an external thread, is connected with an internal thread sleeve 812 and extends into the internal thread sleeve 812; the other end of the inner thread sleeve is connected with the rib bottom plate 37, the top surface of the inner thread sleeve 812 is slightly lower than the UHPC short rib plate, the inner thread sleeve 812 is temporarily plugged when the UHPC is poured, and the temporary plugging is broken after the UHPC is solidified to form a reserved hole.

The connecting beam 822 comprises a connecting screw rod 8221 and a connecting pole 8222, wherein the surface of the connecting screw rod 8221 is subjected to thread cutting, one end of the connecting screw rod 8221 is respectively and vertically connected with the internal thread sleeve 812 at the position of the embedded lifting point and extends into the internal thread sleeve 812, the other end of the connecting screw rod 8222 is connected to form a structure shaped like a Chinese character 'hui', and the longitudinal beam 8211 and the UHPC low rib plates are locked.

The synchronous jacking system comprises a plurality of jacks and a control system which are connected together, wherein the jacks act on the extending part of the cross beam 8212, and the jacking force, the jacking speed and the jacking stroke of the jacks are controlled by the control system, so that the jacks synchronously jack the hanger 821, and the whole plane of the UHPC low rib plate is uniformly jacked out of the groove-shaped steel bottom die.

The mold further comprises a bottom mold 31 and a vertical mold 32, wherein the groove mold 33 is arranged on the bottom mold 31; the length of the air groove 331 is smaller than that of the rib bottom groove, and the width of the air groove 331 is smaller than that of the rib bottom groove.

According to the utility model, the vertical die 32 is arranged on the periphery of the bottom die 31 in a longitudinally sealing and matching manner, the bottom die convex edge in a convex strip shape is arranged on the outer edge of the bottom die 31, and the groove matched with the bottom die convex edge on the outer edge of the bottom die 31 is arranged on the inner side of the vertical die 32, so that the bottom die 31 and the vertical die 32 are relatively fixed more firmly, the installation size is more accurate, the installation is more convenient, and the mutual sealing is more convenient.

The bottom die 31 of the utility model further comprises a bottom die connecting plate, the bottom die connecting plate is arranged on the end surface close to the bottom die convex edge, and the vertical die 32 is tightly connected with the bottom die connecting plate after being matched with the bottom die convex edge with the convex strip-shaped outer edge of the bottom die 31 through the groove.

The vertical mold 32 comprises a transverse vertical mold I, a vertical mold I, a transverse vertical mold II and a vertical mold II which are connected in a matched mode, grooves matched with bottom mold convex edges on the outer edge of a bottom mold 31 are formed in the transverse vertical mold I, the transverse vertical mold II, the vertical mold I and the vertical mold II respectively, and the grooves of the transverse vertical mold I, the transverse vertical mold II, the vertical mold I and the vertical mold II are installed on the bottom mold convex edges on the outer edge of the bottom mold 31 in a matched mode respectively.

The outer edge of the end face of a vertical mold I, which is close to a transverse vertical mold I and a transverse vertical mold II, is provided with a convex strip-shaped convex edge of the vertical mold I, the outer edge of the end face of the vertical mold II, which is close to the transverse vertical mold I and the transverse vertical mold II, is provided with a convex strip-shaped convex edge of the vertical mold II, one end of the inner side of the transverse vertical mold I is provided with a groove matched with the convex edge of the vertical mold I at the outer edge of the vertical mold I, and the other end of the inner side of the transverse vertical mold I is provided with a groove matched with the convex edge of the vertical mold II at the outer edge of the vertical mold II; the horizontal II inboard one ends of founding the mould are provided with the vertical I chimb matched with recess of founding the mould of I outward flange of vertical founding the mould, the other end be provided with the vertical II outward flange of founding the mould of vertical II outward flanges chimb matched with recess.

The periphery of the bottom die 31 is provided with a bottom die convex edge, and the width of the bottom die convex edge is 2.0 mm-20.0 mm.

The lower ends of one sides of a vertical mould I and a vertical mould II are respectively provided with a vertical horizontal groove I and a vertical horizontal groove II; two vertical grooves are formed in two ends of one side face of each of the transverse vertical mold I and the transverse vertical mold II respectively; the lower ends of the transverse vertical mold I and the transverse vertical mold II are respectively provided with a transverse horizontal groove I and a transverse horizontal groove II; the vertical horizontal grooves I, the vertical horizontal grooves II, the horizontal grooves I and the horizontal grooves II of the transverse vertical mold I, the vertical mold I, the transverse vertical mold II and the vertical mold II are respectively embedded and installed with bottom mold convex edges around the bottom mold 31 in a clearance mode, and the range of embedding fit clearance is 0.5 mm-20.0 mm; the vertical mold I and the vertical mold II are provided with I convex edges at two ends and II convex edges respectively embedded into I transverse vertical grooves and II transverse vertical grooves of the I transverse vertical mold and II transverse vertical molds, and the depth of the embedded grooves is 2.0 mm-20 mm.

The upper planes of bottom die convex edges around the bottom die 31 are respectively tightly attached to the upper groove surfaces of the vertical horizontal groove I and the vertical horizontal groove II to ensure the vertical positioning of the vertical die, and the lower end sides of the horizontal vertical die I, the vertical die I, the horizontal vertical die II and the vertical die II are respectively tightly attached to the vertical plane of the bottom die connecting plate of the bottom die 1 and are tightly connected by bolts.

In the convex surface of the groove die 33 of the present invention, the width of the upper end surface of the convex surface is smaller than the width of the lower end of the convex surface.

The process method comprises the following steps: a pneumatic cavity is formed between the bottom of the rib bottom plate and the bottom die, a high-pressure air medium is provided through a high-pressure pneumatic system, the pneumatic cavity is filled and uniformly acted on the rib bottom plate, and the UHPC low rib plate is initially separated from the steel bottom die; the second step is as follows: a hanging bracket 821 is closely attached to the top surface of the UHPC short rib plate, a connecting beam 822 is connected with a corresponding embedded hoisting connecting device 81 embedded in the UHPC short rib plate, the hanging bracket 821 and the UHPC short rib plate are locked into a whole, then the hanging bracket 821 is acted by a synchronous jacking system to jack the UHPC short rib plate out of a certain distance from the groove-type steel bottom die, finally the hanging bracket 821 is hoisted by hoisting equipment, and demoulding of the UHPC short rib plate is completed

The mold further comprises a bottom mold 31 and a vertical mold 32, wherein the groove mold 33 is arranged on the bottom mold 31; the length of the air groove 331 is smaller than that of the rib bottom groove, and the width of the air groove 331 is smaller than that of the rib bottom groove.

In the convex surface of the groove die 33 of the present invention, the width of the upper end surface of the convex surface is smaller than the width of the lower end of the convex surface.

The demolding system further comprises a high-pressure pneumatic system connection, the bottom of the air tank 331 is provided with an air vent 332, the diameter of the air vent 3-1 is 5-10 mm, and the air tank 331 is connected with the high-pressure pneumatic system through the air vent 332.

The air groove 331 of the present invention is provided at the middle position in the width direction of the rib bottom groove and extends to both ends of the rib bottom groove in the length direction. The length of the air groove 331 is 1 mm-200 mm smaller than that of the rib bottom groove, the groove depth of the air groove 331 is 0.1 mm-5.0 mm, and the groove width is 0.5 mm-5.0 mm.

The high-pressure pneumatic system comprises an air compressor, an air tank, a valve, an air pressure conveying pipeline and the like; the high-pressure pneumatic system can provide an air medium with the pressure of 0.5 MPa-1 MPa.

The air groove 331 of the present invention is provided at an intermediate position between the two groove molds 33.

The air groove 331 of the present invention may also be provided at an intermediate position of the rib-bottom groove.

The length of the air groove 331 of the present invention is close to or slightly less than the length of the rib bottom plate 37.

The width of the air groove 331 of the present invention is close to or slightly less than the width of the rib bottom plate 37.

In the production process, firstly, a rib bottom steel plate is placed between a groove die and a groove die or in a rib bottom groove, then the die is poured, after the poured material covers a rib bottom plate, a prefabricated plate, the rib bottom plate and the air groove which are formed by pouring are combined to form a sealed pneumatic cavity, the air groove is inflated, the air pressure in the air groove applies uniform air pressure to the rib bottom plate, when the air in the air groove pushes the rib bottom plate to ascend, the two sides of the rib bottom of the prefabricated plate are separated from the two sides of the rib bottom groove, and then the air in the air groove flows out from the two ends of the air groove and is inflated upwards along the two sides of the rib bottom groove, so that the air acts on other parts without the air groove of the prefabricated plate, the other parts without the air groove cannot be demolded, the prefabricated plate is damaged, and the effect of one-time demolding is achieved.

The rib bottom plate can be a longitudinal rib, a transverse rib or a common transverse rib and longitudinal rib; the upper end of the rib bottom plate is provided with a shear key;

the length of the rib bottom plate is 1 mm-900 mm, preferably 5 mm-300 mm, less than that of the groove die;

the width of the rib bottom plate is 0.01-100 mm, preferably 0.5-10 mm smaller than the width between the two groove dies;

the length of the air groove is 0.01 mm-600 mm, preferably 1 mm-200 mm, less than that of the rib bottom plate;

the depth of the air groove is 0.01 mm-20 mm, preferably 0.1 mm-5 mm; the width of the groove is 0.1 mm-10 mm, preferably 0.5 mm-5 mm;

the vent holes 332 are arranged on two sides of the air tank, one end of each vent hole is connected with the air tank, and the other end of each vent hole is connected with a high-pressure pneumatic system; the diameter of the vent holes 332 is 0.1 mm-10 mm, preferably 0.5 mm-5 mm;

the high-pressure pneumatic system comprises an air compressor, an air tank, a valve and an air pressure conveying pipeline; the high-pressure pneumatic system can provide an air medium with the pressure of 0.5 MPa-1 MPa.

The utility model can also comprise a steel bottom die, a UHPC prefabricated plate rib bottom steel plate, sealing combined rings arranged at the periphery of the steel bottom die and the UHPC prefabricated plate rib bottom steel plate, a pneumatic cavity and a compressed air joint; the steel bottom die is tightly attached to a rib bottom steel plate of the UHPC prefabricated plate; the sealing combination ring comprises a sealing strip, and the sealing strip is arranged at the peripheral edge of the steel bottom die and extends upwards to form a groove type capable of accommodating a rib bottom steel plate of the UHPC prefabricated plate; be equipped with air vent, air duct and air duct on the steel die block, the air duct sets up at steel die block intermediate position and extends to steel die block both ends, the air vent sets up in the air duct both sides, the air vent passes through the air duct and is connected with the air duct, the pneumatic chamber passes through die block, UHPC prefabricated plate rib end steel sheet, sealed combination circle and air duct combination formation.

The steel bottom die comprises a strip shape, and the length of the strip shape is 5 mm-300 mm greater than that of the rib bottom steel plate of the UHPC prefabricated plate; the width of the steel bottom die is 0.5 mm-10.0 mm larger than that of the rib bottom steel plate.

The length of the air groove on the upper surface of the steel bottom die is 1 mm-200 mm smaller than that of the rib bottom steel plate, the depth of the air groove is 0.1 mm-5.0 mm, and the width of the air groove is 0.5 mm-5.0 mm.

One end of the vent hole is connected with the air groove through the vent groove, and the other end of the vent hole is connected with the compressed air joint; the diameter of the vent hole is 5-10 mm.

The pneumatic demoulding method of the utility model comprises the following steps: by using the demoulding structure, after the concrete of the UHPC precast slab reaches the designed strength or the strength allowing demoulding, a pneumatic cavity is formed; at the moment, the vertical template with the constraint on demolding at the periphery of the prefabricated plate is firstly removed, the compressed air connector is connected with a compressed air source, and high-pressure air is introduced into the pneumatic cavity through the vent hole and the air groove; the thrust generated in the pneumatic cavity jacks up the rib bottom steel plate of the UHPC precast slab and pushes the UHPC precast slab to integrally move upwards, and meanwhile, the steel bottom die generates a downward movement trend so that the precast slab is separated from the steel bottom die by 10.02-1.2 mm; at this time, the sealing combination ring around the pneumatic cavity is damaged, and compressed air overflows from the contact surface of the steel moulding plate and the UHPC precast slab, so that the jacking power is lost or weakened, and meanwhile, the UHPC precast slab moves downwards due to the action of gravity and is supported by the steel moulding plate again, and at this time, the demoulding process is finished.

The utility model has the beneficial effects that: the UHPC material has large viscosity, and the bonding force with a steel mould is more than 2-3 times of that of common concrete; the UHPC low rib plate is a thin-wall component, and the cracking or local damage of the precast slab can be caused if external force is not uniform in the demoulding process; the pneumatic demoulding is adopted, so that uniform air pressure can be provided for the plate rib bottom, and the UHPC low rib plate can be separated from the steel bottom mould at one time.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the pre-buried hoisting connection device of the present invention;

FIG. 3 is a schematic view of a lifting connection of the present invention;

FIG. 4 is a schematic view of the mold of the present invention;

FIG. 5 is a schematic view of the pneumatic ejection of the present invention;

FIG. 6 is a schematic view of the gas cell configuration of the present invention;

FIG. 7 is a side schematic view of the ribbed bottom plate of the present invention positioned on a slot die;

fig. 8 is a schematic of the venting of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Example 1, referring to fig. 1 to 2, the present invention includes a UHPC low-rib precast slab and a forming mold composed of a bottom mold, a side mold, and a top mold, the UHPC low-rib precast slab is formed by casting UHPC concrete, and a steel reinforcement cage is disposed therein, wherein: the bottom die comprises a pedestal and basin-type bottom dies, the basin-type bottom dies are distributed at intervals in the length direction of the pedestal, the length of the basin-type bottom dies is smaller than the width of the pedestal, the bottoms of the basin-type bottom dies are fixedly connected with the pedestal in a closed manner, rib bottom grooves are formed between adjacent basin-type bottom dies, rib plates are formed at the corresponding positions of the UHPC low-rib precast slabs and the rib bottom grooves, the bottom surface of the rib plate is provided with a rib bottom steel plate, a plurality of studs are welded on the rib bottom steel plate, the studs are poured in the UHPC short rib precast slab, an air groove and a vent hole which penetrates through the pedestal and is communicated with the air groove are arranged at the rib bottom groove on the pedestal, the width of the rib bottom steel plate is equivalent to that of the rib bottom groove, the length of the rib bottom steel plate is less than that of the UHPC low rib precast slab, the rib bottom steel plate covers the air groove, and the periphery of the rib bottom steel plate is hermetically connected with the pedestal through a sealant, UHPC concrete covers two ends of the rib bottom steel plate, and the vent holes are connected with a high-pressure air source through high-pressure air pipes.

The vent hole is positioned at one side of the air groove, and the vent hole is communicated with the air groove through the vent groove.

The high-pressure air source comprises an air compressor and a high-pressure air tank connected with the air compressor, wherein the high-pressure air tank is connected with a main pipeline, and the main pipeline is respectively connected with each vent hole through branch hoses.

The branch hose is a transparent pipe.

Example 2, referring to fig. 1 to 2,

the process method comprises the following steps:

1) connecting a pedestal hose and closing a pedestal main valve;

2) then, the air compressor (the air compressor or a relief valve of the air tank is opened, and the air compressor is automatically started) and the main valve of the air tank are opened, so that the pressure in the air tank reaches 0.8 Mpa.

3) The main valve of the corresponding pedestal is quickly opened, and high-pressure gas is discharged from the pore channel at one time to separate the precast slab from the pedestal.

4) And (5) checking whether gaps exist between the periphery of the prefabricated plate and the pedestal or not, and if the local area is not separated, detecting that the prefabricated plate is not separated. Closing a main valve of the pedestal, reserving the hose in the area, and pulling out other areas; repeating the above operation, and performing secondary air pressure demoulding on the area.

5) After the mold is removed, the main valve of the pedestal is closed, and the hose is pulled out.

Example 3, referring to fig. 1 to 2,

the UHPC low rib plate comprises a top plate, a rib bottom steel plate arranged at the bottom of the rib plate and a plurality of embedded hoisting connecting devices embedded in the rib plate. The rib plate can be a longitudinal rib or a transverse rib and the longitudinal rib. The rib bottom steel plate and the UHPC low rib plate are connected into a whole through shear connectors and the like; the length of the rib bottom steel plate is 5 mm-300 mm smaller than that of the rib plate; the width of the rib bottom steel plate is 0.5 mm-10.0 mm smaller than that of the rib plate; 2 groups of the embedded hoisting connection devices form embedded hoisting points, the embedded hoisting points are symmetrically arranged along the longitudinal axis and the transverse axis of the UHPC low rib plate, at least two rows are transversely arranged, at least 2-6 embedded hoisting points are longitudinally arranged along the UHPC low rib plate in each row, the distance between the embedded hoisting points is 1-4 m, and the deformation of the UHPC low rib plate in the demolding and hoisting processes is not more than 5mm due to the number of the embedded hoisting points.

The air pressure cavity is formed by sealing a rib bottom steel plate, a rib bottom steel bottom die, an air groove and UHPC at the periphery. The air groove is arranged in the middle of the rib bottom steel bottom die in the width direction and extends to two ends of the rib bottom steel bottom die along the length direction. The length of the air groove is 1 mm-200 mm smaller than that of the rib bottom steel plate, the groove depth is 0.1 mm-5.0 mm, and the groove width is 0.5 mm-5.0 mm.

The high-pressure pneumatic system comprises a high-pressure gas generator, a conveying pipeline, vent holes and the like, wherein the vent holes are formed in a rib bottom steel bottom die; the vent holes are arranged on two sides of the air groove, one end of the vent hole is connected with the air groove through the vent groove, and the other end of the vent hole is connected with a high-pressure pneumatic system; the diameter of the vent hole is 5-10 mm.

The hanger is a rectangular frame which is assembled by longitudinal beams, cross beams and connecting rods and has high strength and rigidity and a shape similar to that of a UHPC (ultra high performance polycarbonate) short rib plate. The longitudinal beam is parallel to the long side of the UHPC low rib plate and is placed between the two embedded hoisting connecting devices of the longitudinal row of embedded hoisting points. The transverse beams are perpendicular to the longitudinal beams, the number of the transverse beams is not less than 2, and each two ends of each transverse beam extend out of the prefabricated plate by 500-2000 mm.

The embedded hoisting connecting device consists of an annular steel bar and an internal thread sleeve. One end of the annular steel bar is provided with an external thread, is connected with the internal thread sleeve and extends into the internal thread sleeve by 1/3-2/3 depth; the other end is connected with the precast slab steel bars. The top surface of the internal thread sleeve is 1-3 cm lower than the top surface of the UHPC short rib plate, temporary plugging is carried out during UHPC pouring, and after the UHPC is solidified, the temporary plugging is broken to form a reserved hole;

the small shoulder pole beam of the utility model consists of 2 connecting screw rods and a connecting pole. The surface of the connecting screw rod is subjected to wire cutting, one end of the connecting screw rod is vertically connected with the internal thread sleeve at the position of the embedded lifting point and extends into the internal thread sleeve to a depth of 1/3-2/3, and the other end of the connecting screw rod is connected with the connecting cross arm to form a back-shaped structure, so that the longitudinal beam and the UHPC low rib plate are locked.

The synchronous jacking system consists of a plurality of jacks which are connected together and a control system. The lifting jacks act on the extending parts of the cross beams, jacking force, jacking speed, jacking stroke and the like of the lifting jacks are controlled by the control system, the lifting jacks synchronously jack the hanging bracket, the jacking stroke deviation of each lifting jack is not more than 10mm in the jacking process, and finally the whole plane of the UHPC low rib plate is uniformly ejected from the groove-shaped steel bottom die.

The demoulding of the UHPC low rib plate of the ribbed bottom steel plate and the groove-shaped steel bottom mould is completed in two steps. The first step is as follows: a pneumatic cavity is formed between the bottom of the rib bottom steel plate and the rib bottom steel bottom die, a high-pressure air medium is provided through a high-pressure pneumatic system, the pneumatic cavity is filled and uniformly acted on the rib bottom steel plate, and the UHPC low rib plate is initially separated from the groove-shaped steel bottom die; the second step is as follows: a plurality of small carrying pole beams are adopted to be connected with a plurality of pre-buried hoisting connecting devices pre-buried in the UHPC short rib plates to enable the hanger) and the UHPC short rib plates to be locked into a whole, then the UHPC short rib plates are jacked out by 20-200 mm from the groove-shaped steel bottom die through the synchronous jacking system, and finally the hanger is hoisted by hoisting equipment to complete the demoulding of the UHPC short rib plates.

Claims (6)

1. A demoulding system of UHPC short floor is characterized in that: the demoulding system comprises a pneumatic demoulding system, a hoisting system and a synchronous jacking system; the pneumatic demoulding system comprises a slot die (33), more than one rib bottom plate (37), UHPC concrete (336) and a compressed air supply system; the groove die (33) comprises a groove bottom surface (332), a groove inclined surface (334) and a groove top surface (333), the groove bottom surface (332), the groove inclined surface (334) and the groove top surface (333) form a trapezoidal cross section, more than two trapezoidal cross sections form the groove die (33), an air groove (331) and a vent hole (335) are arranged in the groove bottom surface (332), compressed air can be introduced from the vent hole (335), rib bottom plates (37) are symmetrically arranged and cover the groove bottom surface (332), the length of the rib bottom plates (37) is smaller than that of the groove bottom surface (332) of the groove die (33), after UHPC concrete (336) is prefabricated, an air cavity is formed by the groove bottom surface (332), the rib bottom plates (37) and the UHPC concrete (336) at two ends in the length direction of the rib bottom plates (37), after the UHPC concrete reaches the strength, the vent hole (335) is used for compressing the compressed air to support the rib bottom plates (37), and after the groove bonding layer (334) and the UHPC top surface (333) and the UHPC concrete are damaged, realizing the separation of the UHPC precast slab from a slot die (33); the hoisting system comprises a pre-buried hoisting connection device (81) and a hoisting connection device (82), the pre-buried hoisting connection device (81) comprises an annular steel bar (811) and an internal thread sleeve (812), one end of the annular steel bar (811) is connected with one end of the internal thread sleeve (812), the pre-buried hoisting connection device (81) is pre-buried on a rib bottom plate (37) of the UHPC short rib prefabricated plate, the hoisting connection device (82) comprises a hanging bracket (821) and a connection beam (822), and the hanging bracket (821) is a frame formed by longitudinal beams (8211) and cross beams (8212) and is relatively balanced in stress.

2. The system for demolding UHPC low floor boards as recited in claim 1, wherein: the mold of the pneumatic demolding system of the UHPC short-rib prefabricated plate mold comprises a mold and a rib bottom plate (37), the mold comprises a groove mold (33), the cross section of the convex surface on the groove mold (33) is trapezoidal, rib bottom grooves are formed by combining every two convex surfaces, air grooves (331) are formed in the rib bottom grooves and can be filled with air, the rib bottom plate (37) is placed on and covers the grooving surfaces of the air grooves (331), and therefore the rib bottom plate (37) and the air grooves (331) form pneumatic cavities.

3. The system for demolding UHPC low floor boards as recited in claim 1, wherein: the hanger (821) is a rectangular framework which is large in strength and rigidity and in the shape of a UHPC (ultra high performance concrete) low rib plate formed by splicing longitudinal beams (8211), transverse beams (8212) and connecting rods, the longitudinal beams (8211) are parallel to the long sides of the UHPC low rib plate and placed between two embedded hoisting connecting devices (81) of longitudinal row embedded hoisting points, and the transverse beams (8212) are perpendicular to the longitudinal beams (8211) and two ends of each transverse beam extend out of a prefabricated plate.

4. The system of claim 3 wherein the mold release system comprises: one end of the annular steel bar (811) is provided with an external thread, is connected with the internal thread sleeve (812), and extends into the internal thread sleeve (812); the other end of the inner thread sleeve is connected with the rib bottom plate (37), the top surface of the inner thread sleeve (812) is lower than the UHPC short rib plate, the inner thread sleeve (812) is temporarily plugged when UHPC is poured, and after the UHPC is solidified, the temporary plugging is broken to form a reserved hole.

5. The system of claim 4, wherein the mold release system comprises: the connecting beam (822) comprises a connecting screw rod (8221) and a connecting cross beam (8222), wherein the surface of the connecting screw rod (8221) is subjected to carving, one end of the connecting screw rod is vertically connected with the internal thread sleeve (812) at the position of the embedded lifting point and extends into the internal thread sleeve (812), the other end of the connecting screw rod is connected with the connecting cross beam (8222) to form a square-shaped structure, and the longitudinal beam (8211) and the UHPC short rib plate are locked.

6. A release system for UHPC low-profile boards as claimed in claim 1 or claim 2 or claim 3 or claim 4 or claim 5 wherein: the synchronous jacking system comprises a plurality of jacks and a control system which are connected together, the jacks act on the extending parts of the cross beams (8212), the jacking force, the jacking speed and the jacking stroke of the jacks are controlled by the control system, so that the jacks synchronously jack the hanging brackets (821), and the whole plane of the UHPC low rib plate is uniformly jacked out of the groove-shaped steel bottom die.

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