CN112112060A - Temporary support for simply supported beam slab and then continuous beam slab and using method of temporary support - Google Patents

Abstract

The invention discloses a temporary bridge support capable of simply supporting and then continuously supporting and a using method thereof, wherein the temporary support comprises the following components: the upper surface of the top steel plate is abutted against the bottom end of the beam body so as to support the beam body; the upper end of the supporting steel plate is fixedly connected with the top steel plate; the lower end of the supporting steel plate is fixedly connected with the bottom steel plate, and the lower surface of the bottom steel plate is abutted against the top of the cushion stone; the cutting groove is fixedly arranged on the outer side of the supporting steel plate so as to guide the oxygen acetylene cutting device; the method comprises the following steps: step 1, manufacturing a temporary support; step 2: the use of a temporary support. The temporary support and the use method thereof have the advantages that the structure is simple, the disassembly is convenient, the cutting seam can be straight when the temporary support is cut, the pressure sensor is fixed on the top steel plate, so that the pressure between the beam body and the temporary support can be clearly known, and the state that the beam body is pressed on the temporary support can be accurately judged.

Description

Temporary support for simply supported beam slab and then continuous beam slab and using method of temporary support

Technical Field

The invention relates to the technical field of temporary supports of bridge engineering, in particular to a temporary support of a simply supported and then continuous bridge and a using method thereof.

Background

The temporary support is used as a necessary tool in the process of constructing the bridge with the simply supported beam and then the continuous beam, is a force transmission body bearing the beam body in the simply supported state, provides necessary conditions for continuous operation of the beam body, and is dismantled until the continuous operation of the bridge is finished. There are two types of temporary supports commonly used today.

One is a temporary support of sulfur mortar, and the application of the sulfur mortar is as follows: putting sulfur or industrial powder (such as pyroxene powder) in an iron pan, heating to 130-140 ℃ to melt the sulfur or industrial powder, adding clean medium sand, heating and stirring to be uniform (the weight ratio of the sulfur to the medium sand is determined by tests, and the general initial ratio is 1: 1); coiling the resistance wires at uniform intervals in a temporary support mold or arranging the resistance wires at a transverse interval of 5cm, exposing the mold at two ends of the resistance wires, pouring sulfur mortar, and cooling to finish the sulfur mortar temporary support. The resistance wire should be buried in during the preparation of sulphur mortar temporary support, for preventing that the electric current from making the resistance wire fusing too high, should choose for use the great resistance wire of resistance value, about 2KW is easily chooseed for use with the power of its resistance wire of spiral form pre-buried to should choose for use between 300 w-500 w with single-row form pre-buried its resistance wire power. The sulfur mortar temporary support has high compressive strength, high rigidity, good toughness and difficult cracking, and four blocks are arranged at the bottom of each beam, so that the construction safety of the beam body can be ensured. The elevation control is accurate, the sulfur mortar precast block has high rigidity and is not easy to be compressed, and the thickness can be accurately adjusted according to the requirement, so that the horizontal state of the beam bottom and the accuracy of the elevation of the beam bottom are ensured. The dismounting is convenient, the resistance wires in the temporary supports at the same pier top are connected in parallel, and the electrification is relieved, so that the permanent supports at the pier top are stressed at the same time, the stress concentration phenomenon is avoided, and the safety of system conversion is ensured.

The temporary support for the sulfur mortar has the following defects: the sand cylinder settlement test is complicated, and if the calculation working condition is inconsistent with the actual working condition, the precision of adjusting and controlling the sand cylinder settlement is not high.

The other type is a piston sleeve type temporary support, and the piston sleeve type temporary support is applied as follows: generally, the steel plate with the thickness not less than 15mm is welded according to the form of figure 1. To prevent the sand from getting damp, the gap between the piston and the sleeve can be plugged with asphalt. The height of the temporary support is determined according to the simulated settlement amount of the press, and the horizontal condition of the top surface of the piston is checked at any time during installation. And when the temporary support is dismounted, the temporary support is easily spanned inside, and the valve at the bottom of the sleeve is opened at the same time. The piston sleeve type temporary support has the advantages that: the structure is simple, the manufacture is easy, and the utility model can be used for a plurality of times. Meanwhile, the problem that the environment is polluted by wastes when the traditional temporary support is dismantled is avoided.

The piston sleeve type temporary support has the defects that a sand cylinder settlement test is complicated, and the precision of adjusting and controlling the sand cylinder settlement is not high if the calculation working condition is inconsistent with the actual working condition.

For example, chinese utility model patent application number is CN 201920237159.3's patent document discloses a temporary support is used in bridge construction, which comprises a support, support upper end middle part activity is pegged graft there is the piston rod, the welding of piston rod upper end has first steel sheet, the welding of piston rod lower extreme has the piston, the equal fixed welding in both ends upper portion has the second fixed block about the support, and two second fixed block middle parts all run through to peg graft and have the movable rod, support lower extreme fixed mounting has the second steel sheet, and the equal fixed welding in both ends has the connecting block about the support, the fixed welding in support left end lower part has first fixed block, the first fixed block left end runs through to peg graft and has the movable post, second steel sheet left part upper end fixed mounting has the third fixed block, third fixed block upper end middle part activity is pegged graft and has the inserted bar, support right-hand.

The above-mentioned prior art has the above-mentioned technical problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a temporary support form which is simple in structural form, easy to manufacture, install and dismantle and accurate in elevation control and a using method.

A simply-supported-then-continuous beam-slab temporary support comprises:

the upper surface of the top steel plate is abutted against the bottom end of the beam body so as to support the beam body;

the upper end of the supporting steel plate is fixedly connected with the top steel plate;

the lower end of the supporting steel plate is fixedly connected with the bottom steel plate, and the lower surface of the bottom steel plate is abutted against the top of the cushion stone;

and the cutting groove is fixedly arranged on the outer side of the supporting steel plate so as to guide the oxygen acetylene cutting device.

Furthermore, the top steel plate is provided with an anti-skid protrusion and an anti-extrusion protrusion, and the anti-extrusion protrusion is made of rubber.

Further, an anti-extrusion protrusion is provided in the anti-slip protrusion.

Furthermore, the bottom end of the bottom steel plate is fixedly provided with a buffer rubber mat.

Further, the supporting steel plate includes first supporting steel plate and second supporting steel plate, cut the fixed setting on first supporting steel plate of cut groove, the second supporting steel plate includes first fixed plate, second fixed plate and fixed round steel, the fixed top that sets up at the top steel plate in top of first fixed plate, the bottom of first fixed plate is equipped with 45 first scarf, the mode that spot welding was passed through to the upper end of fixed round steel is fixed on first scarf, be equipped with-45 second scarf on the second fixed plate, the mode that spot welding was passed through to the lower extreme of fixed round steel is fixed on the second scarf, the bottom mounting of second fixed plate is on the upper surface of end steel plate.

A use method of a temporary support for a simply supported and then continuous beam slab comprises the following steps:

step 1, manufacturing a temporary support:

step 1.1, determining the height of a temporary support according to the height difference between the bottom end of a beam body and the top of a pad stone, welding a first supporting steel plate between a top steel plate and a bottom steel plate, welding a first fixing plate, a second fixing plate and fixing round steel into a second supporting steel plate, welding the second supporting steel plate between the top steel plate and the bottom steel plate, and welding a cutting groove on the first supporting steel plate in a spot welding manner;

step 1.2, sticking prefabricated anti-skid protruding blocks and anti-extrusion protruding blocks on the upper surface of a top steel plate, wherein the anti-skid protruding blocks and the anti-extrusion protruding blocks are arranged at intervals, the anti-extrusion protruding blocks are made of chloroprene rubber, and the anti-extrusion protruding blocks are higher than the anti-skid protruding blocks;

step 1.3, sticking a buffer rubber mat at the bottom end of the bottom steel plate;

step 2, using a temporary support:

2.1, calibrating contour lines of the bottom end and the top end of a girder body on a first pier and a second pier, placing 2 temporary supports on the top of a cushion stone of the first pier, placing 2 temporary supports on the top of the cushion stone of the second pier close to the first pier, and fixing the bottom surfaces of the temporary supports on the upper surface of the cushion stone top, wherein the distance between the edge of the temporary support on the first pier and/or the second pier and the contour line of the bottom end of the girder body is 5 cm;

2.2, hoisting the beam body above the first pier and the second pier by using beam body hoisting equipment, and adjusting the direction and the angle of the beam body hoisting equipment to enable the contour line of the bottom end of the beam body to be opposite to the bottom end of the beam body;

step 2.3, pre-lowering the beam body, synchronously lowering the beam body by using the beam body hoisting equipment until the bottom surface of the beam body is abutted against all temporary supports, calibrating the height of the beam body on the first pier and the height of the beam body on the second pier, and checking whether all the temporary supports are damaged;

2.4, lowering the beam body, and continuously and synchronously lowering the beam body by using the beam body hoisting equipment until the beam body is pressed on all temporary supports;

2.5, continuously connecting a lifting appliance of the beam body lifting equipment with the beam body, wherein the beam body lifting equipment has no lifting force;

and 2.6, converting the simply supported state of the beam body into a continuous state, cutting off the supporting steel plate on the temporary support along the cutting groove by adopting oxygen acetylene to finish the dismantling of the temporary support, and erecting the beam body on the permanent support.

Further, in step 2.3, after the bottom surface of the beam body is abutted against all the temporary supports, wood diagonal braces are erected on the top of the beam body, the first pier and the second pier to assist in stabilizing, and the angle of each wood diagonal brace is 45-60 degrees.

Further, step 1 includes a step of fixing a pressure sensor to the top steel plate.

Further, in step 2.3, pressure values of the temporary supports on the first pier and the second pier are collected to confirm that the gravity of the beam body is not completely pressed on the temporary supports.

Further, in step 2.4, pressure values of the temporary supports on the first pier and the second pier are collected again to confirm that the gravity of the beam body is completely pressed on the temporary supports.

Further, in step 2.1, before the temporary support is placed, the method further comprises the step of treating the top of the cushion stone:

step 2.11, polishing the upper surface of the top of the cushion stone to enable the upper surface of the top of the cushion stone to be relatively horizontal;

step 2.12, preparing an anti-carbonization coating, namely mixing and stirring the components by mass to be milky to prepare the anti-carbonization coating by adopting 10 parts of cement, 12 parts of steel slag powder, 16 parts of styrene-acrylic emulsion, 2 parts of polyvinyl formal, 2 parts of rosin, 3 parts of ammonium acrylate, 0.2 part of dispersing agent, 0.1 part of defoaming agent and 0.1 part of stabilizing agent;

and 2.13, spraying the upper surface and the side wall surface of the top of the cushion stone by using a coating spray gun, after the spraying is finished, naturally drying the anti-carbonization coating, spraying again, naturally drying the anti-carbonization coating, spraying the anti-carbonization coating for the third time, and finishing the spraying of the anti-carbonization coating until the anti-carbonization coating is naturally dried.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the temporary support for the simply supported and continuous beam slab, the top steel plate, the supporting steel plate, the bottom steel plate and the cutting groove are arranged in a matched mode, so that the temporary support for the simply supported and continuous beam slab is simple in structure and convenient and fast to disassemble, and cutting seams can be straight when the temporary support is cut;

2. according to the temporary support for the simply supported and continuous beam slab, the anti-skidding protrusions and the anti-extrusion protrusions are arranged in a matched mode, so that the temporary support for the simply supported and continuous beam slab has an anti-skidding function and an anti-extrusion function, and the application stability of the temporary support is improved;

3. according to the temporary support for the simply-supported and continuously-supported beam slab, the first supporting steel plate, the first fixing plate, the second fixing plate and the fixing round steel are arranged in a matched mode, so that after the first supporting steel plate is cut, the first fixing plate, the second fixing plate and the fixing round steel are decomposed by the gravity of a beam body;

4. according to the use method of the temporary support for the beam slab after simple support, disclosed by the invention, the cushion rubber pad is adhered to the bottom end of the bottom steel plate, so that the top of the cushion stone is protected from direct pressure, and meanwhile, the gravity of the beam body can be buffered;

5. according to the application method of the temporary support for the simply supported and continuous beam slab, the pressure sensor is fixed on the top steel plate, so that the pressure between the beam body and the temporary support can be clearly known, and the state of the beam body pressed on the temporary support can be accurately judged;

6. the use method of the temporary support for the simply supported and continuous beam slab provided by the invention has the advantages that the contour lines of the bottom end of the beam body and the top end of the beam body are calibrated on the first pier and the second pier, so that the accuracy of the lowering position of the beam body is improved.

7. According to the use method of the temporary support for the beam slab after the simple support, provided by the invention, the outer leakage surface of the top of the cushion stone is coated and protected by the steps of polishing the upper surface of the top of the cushion stone, preparing the anti-carbonization coating and spraying the anti-carbonization coating, so that the carbonization of the top of the cushion stone is effectively prevented, and the stability of the support is improved.

Drawings

Fig. 1 is a schematic structural view of a temporary support for a simply-supported and then-continuous beam slab in embodiment 1 of the present invention;

FIG. 2 is a schematic view showing the structure of an anti-slip protrusion and an anti-crushing protrusion in example 1 of the present invention;

FIG. 3 is a schematic structural view of a second supporting steel plate in example 1 of the present invention;

fig. 4 is a schematic view of the temporary support and the beam body in accordance with embodiment 1 of the present invention.

The labels in the figure are: the anti-skidding steel plate support structure comprises a top steel plate 1, an anti-skidding protrusion 11, an anti-extrusion protrusion 12, a support steel plate 2, a first support steel plate 21, a second support steel plate 22, a first fixing plate 221, a first oblique plane 2211, a second fixing plate 222, a second oblique plane 2221, a fixed round steel 223, a bottom steel plate 3, a cutting groove 4 and a beam body 5.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, it being understood that the embodiments and features of the embodiments of the present application can be combined with each other without conflict.

Example 1

As shown in fig. 1 and 4, a simply supported and then continuous beam slab temporary support includes:

the upper surface of the top steel plate 1 abuts against the bottom end of the beam body 5 to support the beam body 5;

the upper end of the supporting steel plate 2 is fixedly connected with the top steel plate 1;

the lower end of the supporting steel plate 2 is fixedly connected to the bottom steel plate 3, and the lower surface of the bottom steel plate 3 abuts against the top of the cushion stone;

and the cutting groove 4 is fixedly arranged on the outer side of the supporting steel plate 2 so as to guide the oxygen acetylene cutting device.

In the past engineering construction, the oxygen acetylene cutting device adopts manual operation, and the incision is uneven so that the temporary support is difficult to take out.

In this embodiment, the top steel plate 1, the bottom steel plate 3 and the support steel plate 2 are made of q300 material, wherein the thickness of the steel plate is 1.5-3.0 cm.

As shown in fig. 2, the top steel plate 1 is provided with an anti-slip protrusion 11 and an anti-extrusion protrusion 12, and the anti-extrusion protrusion 12 is made of rubber.

The anti-extrusion protrusions 12 are arranged in the anti-sliding protrusions 11, in the practical application process, the beam body 5 is pressed on the top steel plate 1, the beam body 5 and the temporary support are easy to slide relatively, the anti-sliding protrusions 11 are used for preventing relative sliding, although the anti-sliding protrusions 11 can prevent relative sliding, the bottom surface of the beam body 5 is easy to damage due to sharp protrusions, and the anti-extrusion protrusions 12 are made of rubber materials and clamped between the top steel plate 1 and the bottom surface of the beam body 5 to reduce damage of the sharp protrusions of the anti-sliding protrusions 11 to the bottom surface of the beam body 5.

In order to prevent the beam body 5 from pressing the temporary support to make the surface of the top of the base stone generate indentation and broken surface, the bottom end of the bottom steel plate 3 is fixedly provided with a buffer rubber pad which is made of silica gel.

As shown in fig. 3, the supporting steel plate 2 includes a first supporting steel plate 21 and a second supporting steel plate 22, the cutting groove 4 is fixedly disposed on the first supporting steel plate 21, the second supporting steel plate 22 includes a first fixing plate 221, a second fixing plate 222 and fixing round steel 223, the top end of the first fixing plate 221 is fixedly disposed on the top end of the top steel plate 1, the bottom end of the first fixing plate 221 is provided with a 45 ° first oblique-cutting plane 2211, the upper end of the fixing round steel 223 is fixed on the first oblique-cutting plane 2211 through spot welding, the second fixing plate 222 is provided with a-45 ° second oblique-cutting plane 2221, the lower end of the fixing round steel 223 is fixed on the second oblique-cutting plane 2221 through spot welding, and the bottom end of the second fixing plate 222 is fixed on the upper surface of the bottom steel plate 3.

After the oxygen acetylene cutting groove 4 cuts the first supporting steel plate 21, the gravity of the beam body 5 is only pressed on the second supporting steel plate 22, because the first fixing plate 221, the second fixing plate 222 and the fixing round steel 223 adopt a spot welding mode, under heavy pressure, the welding spot is broken, the first fixing plate 221 and the second fixing plate 222 are separated, namely, the temporary support is decomposed into two parts through cutting and the gravity of the beam body 5.

The use method of the temporary support for the simply supported and then continuous beam slab comprises the following steps:

step 1, manufacturing a temporary support:

step 1.1, determining the height of a temporary support according to the height difference between the bottom end of a beam body 5 and the top of a pad stone, welding a first supporting steel plate 21 between a top steel plate 1 and a bottom steel plate 3, welding a first fixing plate 221, a second fixing plate 222 and fixing round steel 223 into a second supporting steel plate 22, welding the second supporting steel plate 22 between the top steel plate 1 and the bottom steel plate 3, and welding a cutting groove 4 on the first supporting steel plate 21 in a spot welding manner, wherein the fixing round steel 223 is fixed between the first fixing plate 221 and the second fixing plate 222 in a spot welding manner;

step 1.2, sticking prefabricated anti-skid protruding blocks and anti-extrusion protruding blocks on the upper surface of a top steel plate 1, wherein the anti-skid protruding blocks and the anti-extrusion protruding blocks are arranged at intervals, the anti-skid protruding blocks are made of the same material as the top steel plate 1, when the anti-skid protruding blocks are stuck, the upper surface of the top steel plate 1 and the lower surface of the anti-skid protruding blocks are rough in an etching mode, steel plate adhesive glue is used for sticking, the anti-extrusion protruding blocks are made of chloroprene rubber, and the anti-extrusion protruding blocks are higher than the anti-skid protruding blocks;

step 1.3, sticking a buffer rubber mat at the bottom end of the bottom steel plate 1;

step 2, using a temporary support:

2.1, calibrating contour lines of the bottom end of the girder body 5 and the top end of the girder body 5 on a first bridge pier and a second bridge pier, placing 2 temporary supports on the top of a cushion stone of the first bridge pier, placing 2 temporary supports on the top of a cushion stone of the second bridge pier close to the first bridge pier, fixing the bottom surfaces of the temporary supports on the upper surface of the cushion stone top, and fixing a bottom steel plate 3 of each temporary support on the upper surface of the cushion stone top through two anchoring grooves, wherein the distance between the edge of each temporary support on the first bridge pier and/or the second bridge pier and the contour line of the bottom end of the girder body 5 is 5 cm;

2.2, hoisting a beam body 5 to the upper parts of the first pier and the second pier by adopting beam body hoisting equipment, adjusting the direction and the angle of the beam body hoisting equipment to enable the contour line of the bottom end of the beam body 5 to be over against the bottom end of the beam body 5, inspecting the top surfaces of the bolsters of the first pier and the second pier, and inspecting the firmness of the temporary support, wherein the beam body hoisting equipment adopts a bridge girder erection machine;

2.3, pre-lowering the beam body 5, synchronously lowering the beam body 5 by using a beam body hoisting device until the bottom surface of the beam body 5 abuts against all temporary supports, calibrating the height of the beam body 5 on the first bridge pier and the height of the beam body 5 on the second bridge pier, judging whether the height of the beam body 5 is normal or not by combining the heights of the first bridge pier, the second bridge pier and the temporary supports, and checking whether all the temporary supports are damaged or not;

2.4, lowering the beam body, and continuously and synchronously lowering the beam body by using the beam body hoisting equipment until the beam body is pressed on all temporary supports;

2.5, continuously connecting the lifting appliance of the beam body lifting equipment with the beam body, wherein the beam body lifting equipment has no lifting force;

and 2.6, converting the simply supported state of the beam body into a continuous state, removing the supporting steel plate on the temporary support by adopting oxygen and acetylene to finish the removal of the temporary support, and erecting the beam body on the permanent support.

As an improvement, in step 2.3, after the bottom surface of the beam body 5 abuts against all the temporary supports, wood diagonal braces are erected on the top of the beam body 5 and the bolsters of the first pier and the second pier to assist in stabilizing, the angle of each wood diagonal brace is 45-60 degrees, after the beam body 5 is put down, the beam body 5 presses on all the temporary supports, and the wood diagonal braces are detached.

In step 2.3, in order to ensure that the beam body 5 is damaged by touching a sharp object in the moving process, the convex angle position of the beam body 5 is coated with buffer foam; in step 2.4, the buffer foam coated at the convex angle position of the beam body 5 is removed, so that the beam body 5 is conveniently lowered onto the temporary support.

Example 2

In step 2.1, before the temporary support is placed, the method further comprises the step of treating the top of the cushion stone:

step 2.11, polishing the upper surface of the top of the cushion stone to enable the upper surface of the top of the cushion stone to be relatively horizontal;

step 2.12, preparing an anti-carbonization coating, namely mixing and stirring the components by mass to be milky to prepare the anti-carbonization coating by adopting 10 parts of cement, 12 parts of steel slag powder, 16 parts of styrene-acrylic emulsion, 2 parts of polyvinyl formal, 2 parts of rosin, 3 parts of ammonium acrylate, 0.2 part of dispersing agent, 0.1 part of defoaming agent and 0.1 part of stabilizing agent;

and 2.13, spraying the upper surface and the side wall surface of the top of the cushion stone by using a coating spray gun, after the spraying is finished, naturally drying the anti-carbonization coating, spraying again, naturally drying the anti-carbonization coating, spraying the anti-carbonization coating for the third time, and finishing the spraying of the anti-carbonization coating until the anti-carbonization coating is naturally dried.

Example 3

In step 1, a step of fixing the pressure sensor to the top steel plate 1 is further included.

And 2.3, collecting pressure values of the temporary supports on the first pier and the second pier to confirm that the gravity of the beam body is not completely pressed on the temporary supports.

And 2.4, acquiring the pressure values of the temporary supports on the first pier and the second pier again to confirm that the gravity of the beam body is completely pressed on the temporary supports.

In the practical application process, the pressure value of each temporary support is displayed on a display interface of an operator of the beam body hoisting equipment, and the operator judges the stress state of each temporary support according to the pressure value displayed on the display interface, so that the operation of the beam body hoisting equipment is controlled.

The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims.

Claims (10)

1. The utility model provides an advance simply support back continuous beam slab temporary support which characterized in that includes:

the upper surface of the top steel plate is abutted against the bottom end of the beam body so as to support the beam body;

the upper end of the supporting steel plate is fixedly connected with the top steel plate;

the lower end of the supporting steel plate is fixedly connected with the bottom steel plate, and the lower surface of the bottom steel plate is abutted against the top of the cushion stone;

and the cutting groove is fixedly arranged on the outer side of the supporting steel plate so as to guide the oxygen acetylene cutting device.

2. The temporary support for the simply supported and then continuous beam and slab as claimed in claim 1, wherein the top steel plate is provided with an anti-slip protrusion and an anti-extrusion protrusion, and the anti-extrusion protrusion is made of rubber.

3. The primary simply supported and then continuous beam panel temporary support of claim 1, wherein the anti-extrusion protrusion is provided in the anti-slip protrusion.

4. The temporary support for the beam slab, which is simply supported and then continuous as claimed in claim 1, wherein a cushion rubber pad is fixed to the bottom end of the bottom steel plate.

5. The first simple support and then continuous beam slab temporary support according to claim 1, wherein the support steel plate comprises a first support steel plate and a second support steel plate, the cutting groove is fixedly arranged on the first support steel plate, the second support steel plate comprises a first fixing plate, a second fixing plate and fixing round steel, the top end of the first fixing plate is fixedly arranged at the top end of the top steel plate, the bottom end of the first fixing plate is provided with a 45-degree first inclined plane, the upper end of the fixing round steel is fixed on the first inclined plane through spot welding, the second fixing plate is provided with a-45-degree second inclined plane, the lower end of the fixing round steel is fixed on the second inclined plane through spot welding, and the bottom end of the second fixing plate is fixed on the upper surface of the bottom steel plate.

6. A use method of a temporary support for simply supported and then continuous beam slabs is characterized by comprising the following steps:

step 1, manufacturing a temporary support:

step 1.1, determining the height of a temporary support according to the height difference between the bottom end of a beam body and the top of a pad stone, welding a first supporting steel plate between a top steel plate and a bottom steel plate, welding a first fixing plate, a second fixing plate and fixing round steel into a second supporting steel plate, welding the second supporting steel plate between the top steel plate and the bottom steel plate, and welding a cutting groove on the first supporting steel plate in a spot welding manner;

step 1.2, sticking prefabricated anti-skid protruding blocks and anti-extrusion protruding blocks on the upper surface of a top steel plate, wherein the anti-skid protruding blocks and the anti-extrusion protruding blocks are arranged at intervals, the anti-extrusion protruding blocks are made of chloroprene rubber, and the anti-extrusion protruding blocks are higher than the anti-skid protruding blocks;

step 1.3, sticking a buffer rubber mat at the bottom end of the bottom steel plate;

step 2, using a temporary support:

2.1, calibrating contour lines of the bottom end and the top end of a girder body on a first pier and a second pier, placing 2 temporary supports on the top of a cushion stone of the first pier, placing 2 temporary supports on the top of the cushion stone of the second pier close to the first pier, and fixing the bottom surfaces of the temporary supports on the upper surface of the cushion stone top, wherein the distance between the edge of the temporary support on the first pier and/or the second pier and the contour line of the bottom end of the girder body is 5 cm;

2.2, hoisting the beam body above the first pier and the second pier by using beam body hoisting equipment, and adjusting the direction and the angle of the beam body hoisting equipment to enable the contour line of the bottom end of the beam body to be opposite to the bottom end of the beam body;

step 2.3, pre-lowering the beam body, synchronously lowering the beam body by using the beam body hoisting equipment until the bottom surface of the beam body is abutted against all temporary supports, calibrating the height of the beam body on the first pier and the height of the beam body on the second pier, and checking whether all the temporary supports are damaged;

2.4, lowering the beam body, and continuously and synchronously lowering the beam body by using the beam body hoisting equipment until the beam body is pressed on all temporary supports;

2.5, continuously connecting a lifting appliance of the beam body lifting equipment with the beam body, wherein the beam body lifting equipment has no lifting force;

and 2.6, converting the simply supported state of the beam body into a continuous state, cutting off the supporting steel plate on the temporary support along the cutting groove by adopting oxygen acetylene to finish the dismantling of the temporary support, and erecting the beam body on the permanent support.

7. The method for using the temporary supports of the simply supported and then continuous beam slab as claimed in claim 6, wherein in step 2.3, after the bottom surface of the beam body is abutted against all the temporary supports, wood diagonal braces are erected on the top of the beam body and the stone pads of the first pier and the second pier to assist in stabilizing, and the angle of each wood diagonal brace is 45-60 degrees.

8. The use method of the temporary support of the simply supported and then continuous beam-slab as claimed in claim 6, wherein the step 1 further comprises the step of fixing a pressure sensor on the top steel plate.

9. The use method of the temporary support of the simply supported and then continuous beam slab as claimed in claim 8, wherein in step 2.3, pressure values of the temporary support on the first pier and the second pier are collected to confirm that the gravity of the beam body is not completely pressed on the temporary support; and 2.4, acquiring the pressure values of the temporary supports on the first pier and the second pier again to confirm that the gravity of the beam body is completely pressed on the temporary supports.

10. The method for using the temporary support of the simply supported and then continuous beam-slab as claimed in claim 6, wherein in the step 2.1, before the temporary support is placed, the method further comprises the step of processing the top of the cushion stone:

step 2.11, polishing the upper surface of the top of the cushion stone to enable the upper surface of the top of the cushion stone to be relatively horizontal;

step 2.12, preparing an anti-carbonization coating, namely mixing and stirring the components by mass to be milky to prepare the anti-carbonization coating by adopting 10 parts of cement, 12 parts of steel slag powder, 16 parts of styrene-acrylic emulsion, 2 parts of polyvinyl formal, 2 parts of rosin, 3 parts of ammonium acrylate, 0.2 part of dispersing agent, 0.1 part of defoaming agent and 0.1 part of stabilizing agent;

and 2.13, spraying the upper surface and the side wall surface of the top of the cushion stone by using a coating spray gun, after the spraying is finished, naturally drying the anti-carbonization coating, spraying again, naturally drying the anti-carbonization coating, spraying the anti-carbonization coating for the third time, and finishing the spraying of the anti-carbonization coating until the anti-carbonization coating is naturally dried.

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