A simply supported and then continuous beam-slab temporary support and its usage method

Abstract

The present invention discloses a temporary support for a simply supported and then continuous bridge and its using method. The temporary support includes: a top steel plate, the upper surface of which abuts against the bottom end of the beam body to support the beam body; a support steel plate, the upper end of which is fixedly connected to the top steel plate; a bottom steel plate, the lower end of the support steel plate is fixedly connected to the bottom steel plate, and the lower surface of the bottom steel plate abuts against the top of the cushion stone; a cutting groove, fixedly arranged on the outside of the support steel plate to guide an oxygen-acetylene cutting device. The method includes: Step 1, the fabrication of the temporary support; Step 2: the use of the temporary support. The temporary support and its using method of the present invention have a simple structure and are convenient to disassemble. When cutting the temporary support, the cutting seam can be made straight. By fixing a pressure sensor on the top steel plate, the pressure between the beam body and the temporary support can be clearly known, so as to accurately judge the state of the beam body pressing on the temporary support.

Description

Technical Field

[0001] The present invention relates to the technical field of temporary bearings for bridge engineering, and particularly relates to a temporary bearing for a simply supported and then continuous bridge and a using method thereof. Background Art

[0002] As an essential tool in the construction process of a simply supported and then continuous beam bridge, a temporary bearing is a force transmission body that bears the beam body in the simply supported state, provides necessary conditions for continuous operation of the beam body, and is removed after the continuous operation of the bridge is completed. Currently, there are two common forms of temporary bearings.

[0003] One is a sulfur mortar temporary bearing. The construction of sulfur mortar: Place sulfur or industrial powder (such as diabase powder) in an iron pot, heat it to 130°C - 140°C to melt it, and then add clean medium sand and stir while heating until it is uniform (the weight ratio of sulfur to medium sand is determined by tests, and the general initial ratio is 1:1); Coil the resistance wires evenly in the temporary bearing mold or arrange them at a horizontal spacing of 5 cm. The two ends of the resistance wires protrude from the mold, pour sulfur mortar, and after cooling, the sulfur mortar temporary bearing is completed. Resistance wires should be embedded when making the sulfur mortar temporary bearing. To prevent the resistance wires from melting due to excessive current, resistance wires with a larger resistance value should be selected. For resistance wires embedded in a coiled form, the power of the resistance wires is preferably about 2KW, and for those embedded in a single row form, the power of the resistance wires is preferably between 300W - 500W. The sulfur mortar temporary bearing has high compressive strength, large stiffness, good toughness, and is not easily broken. Four pieces are installed at the bottom of each beam, which can fully ensure the safety of beam body construction. The elevation control is accurate. The sulfur mortar precast block has large rigidity and is not easily compressed, and the thickness can be accurately adjusted as needed, thus ensuring the horizontal state of the beam bottom and the accuracy of the beam bottom elevation. It is convenient to remove. Connect the resistance wires in each temporary bearing at the same pier top in parallel and energize them simultaneously to release, so that each permanent bearing at the pier top can be stressed simultaneously, thus preventing the occurrence of stress concentration and ensuring the safety of system conversion.

[0004] The disadvantages of the sulfur mortar temporary bearing are as follows: The sand cylinder settlement test is relatively cumbersome. When the calculated working conditions are inconsistent with the actual working conditions, the accuracy of adjusting and controlling the sand cylinder settlement is not high.

[0005] The other is a piston sleeve type temporary bearing. The construction of the piston sleeve type temporary bearing: Generally, use a steel plate with a thickness of not less than 15 mm in accordance with Figure 1Fabricated by form welding. To prevent sand from getting damp, the gap between the piston and the sleeve can be filled with asphalt. The height of the temporary support is determined according to the settlement amount simulated by the press, and the horizontal condition of the piston top surface is checked at any time during installation. When demolishing, open the valve at the bottom of the sleeve for the temporary supports within one span simultaneously. The advantages of the piston-sleeve type temporary support are as follows: simple structural form, easy to fabricate, and can be put into use multiple times. At the same time, it avoids the problem of environmental pollution caused by waste during the demolition of traditional temporary supports.

[0006] The disadvantage of the piston-sleeve type temporary support is that the sand cylinder settlement amount test is rather cumbersome. When the calculated working condition is inconsistent with the actual working condition, the accuracy of adjusting and controlling the sand cylinder settlement amount is not high.

[0007] For example, the patent document with the Chinese utility model patent application number CN201920237159.3 discloses a temporary support for bridge construction demolition, including a support. A piston rod is movably inserted in the middle of the upper end of the support. A first steel plate is welded to the upper end of the piston rod, and a piston is welded to the lower end of the piston rod. Second fixing blocks are fixedly welded to the upper parts of the left and right ends of the support, and movable rods are inserted through the middle parts of the two second fixing blocks. A second steel plate is fixedly installed at the lower end of the support, and connecting blocks are fixedly welded to the left and right ends of the support. A first fixing block is fixedly welded to the lower part of the left end of the support, and a movable column is inserted through the left end of the first fixing block. A third fixing block is fixedly installed at the upper end of the left part of the second steel plate, and a plug rod is movably inserted through the middle of the upper end of the third fixing block. A handle is fixedly welded to the right end of the support.

[0008] The above-mentioned prior art has the above-mentioned technical problems. Summary of the Invention

[0009] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a temporary support form and its using method with a simple structural form, easy fabrication, installation and demolition, and accurate elevation control.

[0010] A simply supported and then continuous beam and slab temporary support includes:

[0011] A top steel plate, the upper surface of which abuts against the bottom end of the beam body to support the beam body;

[0012] A support steel plate, the upper end of which is fixedly connected to the top steel plate;

[0013] A bottom steel plate, the lower end of the support steel plate is fixedly connected to the bottom steel plate, and the lower surface of the bottom steel plate abuts against the top of the cushion stone;

[0014] A cutting groove, fixedly arranged on the outside of the support steel plate to guide the oxygen-acetylene cutting device.

[0015] Furthermore, anti-slip protrusions and anti-extrusion protrusions are provided on the top steel plate, and the anti-extrusion protrusions are made of rubber material.

[0016] Further, the anti-extrusion protrusions are arranged among the anti-slip protrusions.

[0017] Further, a buffer rubber pad is fixedly arranged at the bottom end of the bottom steel plate.

[0018] Further, the support steel plate includes 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 includes a first fixing plate, a second fixing plate and a fixing round steel. The top end of the first fixing plate is fixedly arranged at the top end of the top steel plate. A first inclined plane with an angle of 45° is arranged at the bottom end of the first fixing plate. The upper end of the fixing round steel is fixed on the first inclined plane by spot welding. A second inclined plane with an angle of -45° is arranged on the second fixing plate. The lower end of the fixing round steel is fixed on the second inclined plane by spot welding. The bottom end of the second fixing plate is fixed on the upper surface of the bottom steel plate.

[0019] A using method of a simply supported and then continuous beam and slab temporary support includes the following steps:

[0020] Step 1, fabrication of the temporary support:

[0021] Step 1.1, determine the height of the temporary support according to the height difference between the bottom end of the beam body and the top of the bearing pad stone. Weld the first support steel plate between the top steel plate and the bottom steel plate. Weld the first fixing plate, the second fixing plate and the fixing round steel into the second support steel plate. Weld the second support steel plate between the top steel plate and the bottom steel plate. Weld the cutting groove on the first support steel plate by spot welding;

[0022] Step 1.2, paste the prefabricated anti-slip protrusion blocks and anti-extrusion protrusion blocks on the upper surface of the top steel plate. Among them, the anti-slip protrusion blocks and the anti-extrusion protrusion blocks are arranged at intervals. The anti-extrusion protrusion blocks are made of chloroprene rubber and are higher than the anti-slip protrusion blocks;

[0023] Step 1.3, paste a buffer rubber pad at the bottom end of the bottom steel plate;

[0024] Step 2, use of the temporary support:

[0025] Step 2.1, mark the contour lines of the bottom end and the top end of the beam body on the first pier and the second pier. Place 2 temporary supports on the top of the bearing pad stone of the first pier. Place 2 temporary supports on the top of the bearing pad stone of the second pier adjacent to the first pier. Fix the bottom surface of the temporary support on the upper surface of the bearing pad stone. Among them, 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 beam body is 5 cm;

[0026] Step 2.2, use a beam body hoisting device to hoist the beam body above the first pier and the second pier. Adjust the direction and angle of the beam body hoisting device so that the contour line of the bottom end of the beam body is directly opposite to the bottom end of the beam body;

[0027] Step 2.3, preliminarily lower the beam body. The beam body hoisting device synchronously lowers the beam body until the bottom surface of the beam body abuts against all the temporary bearings, calibrate the height of the beam body on the first pier and the height on the second pier, and check whether all the temporary bearings are damaged;

[0028] Step 2.4, lower the beam body. The beam body hoisting device continues to synchronously lower the beam body until the beam body presses on all the temporary bearings;

[0029] Step 2.5, the sling of the beam body hoisting device continues to be connected to the beam body. At this time, the beam body hoisting device has no lifting force;

[0030] Step 2.6, convert the simply supported state of the beam body into a continuous state. Use oxygen-acetylene to cut off the support steel plates on the temporary bearings along the cutting grooves to complete the removal of the temporary bearings, and the beam body is erected on the permanent bearings.

[0031] Further, in Step 2.3, after the bottom surface of the beam body abuts against all the temporary bearings, wooden diagonal braces are erected on the beam body and the top surfaces of the bearing pads of the first pier and the second pier to assist in stabilizing. The angle of the wooden diagonal braces is 45 - 60°.

[0032] Further, in Step 1, it also includes the step of fixing a pressure sensor on the top steel plate.

[0033] Further, in Step 2.3, collect the pressure values of the temporary bearings on the first pier and the second pier to confirm that the gravity of the beam body is not all pressing on the temporary bearings.

[0034] Further, in Step 2.4, collect the pressure values of the temporary bearings on the first pier and the second pier again to confirm that the gravity of the beam body is all pressing on the temporary bearings.

[0035] Further, in Step 2.1, before placing the temporary bearings, it also includes the step of treating the top surface of the bearing pad:

[0036] Step 2.11, polish the upper surface of the bearing pad to make the upper surface of the bearing pad relatively horizontal;

[0037] Step 2.12, prepare the anti-carbonation coating. Use 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 parts of dispersant, 0.1 part of defoamer and 0.1 part of stabilizer. The above components are in terms of mass. Mix and stir the above components until they are in a milky state to obtain the anti-carbonation coating;

[0038] Step 2.13: Use a paint spray gun to spray on the upper surface and side wall surface of the top of the bearing pad stone. After spraying, wait for the anti-carbonation paint to air dry naturally, then spray again. After waiting for the anti-carbonation paint to air dry naturally, spray the anti-carbonation paint for the third time until the anti-carbonation paint air dries naturally to complete the spraying of the anti-carbonation paint.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] 1. For the simply supported and then continuous beam-slab temporary bearing proposed by the present invention, through the cooperative setting of the top steel plate, support steel plate, bottom steel plate and cutting groove, the structure of the simply supported and then continuous beam-slab temporary bearing is simple, the disassembly is convenient, and the cutting seam can be made straight when cutting the temporary bearing;

[0041] 2. For the simply supported and then continuous beam-slab temporary bearing proposed by the present invention, through the cooperative setting of the anti-slip protrusions and anti-extrusion protrusions, the simply supported and then continuous beam-slab temporary bearing has both anti-slip function and anti-extrusion function, improving the application stability of the temporary bearing;

[0042] 3. For the simply supported and then continuous beam-slab temporary bearing proposed by the present invention, through the cooperative setting of the first support steel plate, the first fixing plate, the second fixing plate and the fixing round steel, after the first support steel plate is cut, the first fixing plate, the second fixing plate and the fixing round steel are decomposed by the gravity of the beam body;

[0043] 4. For the using method of the simply supported and then continuous beam-slab temporary bearing proposed by the present invention, by pasting a buffer rubber pad at the bottom end of the bottom steel plate, it protects the top of the bearing pad stone from direct pressure and can buffer the gravity of the beam body at the same time;

[0044] 5. For the using method of the simply supported and then continuous beam-slab temporary bearing proposed by the present invention, by fixing a pressure sensor on the top steel plate, the pressure between the beam body and the temporary bearing can be clearly known, so as to accurately judge the state of the beam body pressing on the temporary bearing;

[0045] 6. For the using method of the simply supported and then continuous beam-slab temporary bearing proposed by the present invention, by calibrating the contour lines of the bottom end and the top end of the beam body on the first pier and the second pier, the accuracy of the lowering position of the beam body is improved.

[0046] 7. For the using method of the simply supported and then continuous beam-slab temporary bearing proposed by the present invention, through the steps of grinding the upper surface of the top of the bearing pad stone, preparing the anti-carbonation paint and spraying the anti-carbonation paint, the exposed surface of the top of the bearing pad stone is coated and protected, effectively preventing the carbonation of the top of the bearing pad stone and improving the support stability. Description of the Drawings

[0047] Figure 1 It is a schematic structural diagram of the simply supported and then continuous beam-slab temporary bearing in Embodiment 1 of the present invention;

[0048] Figure 2 It is a schematic structural diagram of the anti-slip protrusion and anti-extrusion protrusion in Embodiment 1 of the present invention;

[0049] Figure 3 It is a schematic structural diagram of the second support steel plate in Embodiment 1 of the present invention;

[0050] Figure 4 It is a schematic diagram of the cooperation between the temporary support and the beam body in Embodiment 1 of the present invention.

[0051] Markings in the figure: 1 - top steel plate, 11 - anti-slip protrusion 11, 12 - anti-extrusion protrusion, 2 - support steel plate, 21 - first support steel plate, 22 - second support steel plate, 221 - first fixing plate, 2211 - first inclined plane, 222 - second fixing plate, 2221 - second inclined plane, 223 - fixing round steel, 3 - bottom steel plate, 4 - cutting groove, 5 - beam body. Detailed implementation manners

[0052] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Embodiment

[0053] As Figure 1 and Figure 4 shown, a simply supported and then continuous beam and slab temporary support includes:

[0054] A top steel plate 1, 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;

[0055] A support steel plate 2, the upper end of the support steel plate 2 is fixedly connected to the top steel plate 1;

[0056] A bottom steel plate 3, the lower end of the support 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;

[0057] A cutting groove 4, fixedly arranged on the outside of the support steel plate 2 to guide the oxyacetylene cutting device.

[0058] In previous engineering constructions, the oxyacetylene cutting device was manually operated, and the cut was not neat, resulting in the difficulty of removing the temporary support.

[0059] In this embodiment, the top steel plate 1, the bottom steel plate 3 and the support steel plate 2 are made of q300 material, and the thickness of the steel plate is 1.5 - 3.0 cm.

[0060] As Figure 2As shown in the figure, the top steel plate 1 is provided with anti-slip protrusions 11 and anti-extrusion protrusions 12, and the anti-extrusion protrusions 12 are made of rubber material.

[0061] The anti-extrusion protrusions 12 are arranged within the anti-slip protrusions 11. During actual application, the beam body 5 presses on the top steel plate 1, and relative sliding is likely to occur between the beam body 5 and the temporary bearing. The anti-slip protrusions 11 are used to prevent relative sliding. Although the anti-slip protrusions 11 can prevent relative sliding, due to their sharp protrusions, they are likely to cause damage to the bottom surface of the beam body 5. The anti-extrusion protrusions 12 made of rubber material are clamped between the top steel plate 1 and the bottom surface of the beam body 5 to reduce the damage to the bottom surface of the beam body 5 caused by the sharp protrusions of the anti-slip protrusions 11.

[0062] In order to prevent the beam body 5 from pressing on the temporary bearing and causing indentations and broken surfaces on the surface of the cushion stone top, a buffer rubber pad is fixedly provided at the bottom end of the bottom steel plate 3, and the buffer rubber pad is made of silica gel material.

[0063] As Figure 3 shown, the support steel plate 2 includes a first support steel plate 21 and a second support steel plate 22. The cutting groove 4 is fixedly arranged on the first support steel plate 21. The second support steel plate 22 includes a first fixing plate 221, a second fixing plate 222 and a fixing round steel 223. The top end of the first fixing plate 221 is fixedly arranged at the top end of the top steel plate 1. A 45° first inclined surface 2211 is provided at the bottom end of the first fixing plate 221. The upper end of the fixing round steel 223 is fixed on the first inclined surface 2211 by spot welding. A -45° second inclined surface 2221 is provided on the second fixing plate 222. The lower end of the fixing round steel 223 is fixed on the second inclined surface 2221 by spot welding. The bottom end of the second fixing plate 222 is fixed on the upper surface of the bottom steel plate 3.

[0064] After the oxygen-acetylene cutting groove 4 cuts the first support steel plate 21, the gravity of the beam body 5 only presses on the second support steel plate 22. Since the first fixing plate 221, the second fixing plate 222 and the fixing round steel 223 are fixed by spot welding, under heavy pressure, the solder joints break, and the first fixing plate 221 and the second fixing plate 222 are separated from each other. That is, through cutting and the gravity of the beam body 5 itself, the temporary bearing is decomposed into two parts.

[0065] The using method of the simply-supported continuous beam and slab temporary bearing includes the following steps:

[0066] Step 1, fabrication of the temporary bearing:

[0067] Step 1.1: Determine the height of the temporary bearing according to the height difference between the bottom end of the beam body 5 and the top surface of the bearing pad stone. Weld the first support steel plate 21 between the top steel plate 1 and the bottom steel plate 3. Weld the first fixing plate 221, the second fixing plate 222 and the fixing round steel 223 to form the second support steel plate 22, and weld the second support steel plate 22 between the top steel plate 1 and the bottom steel plate 3. Weld the cutting groove 4 on the first support steel plate 21 by spot welding. Among them, the fixing round steel 223 is fixed between the first fixing plate 221 and the second fixing plate 222 by spot welding;

[0068] Step 1.2: Paste the prefabricated anti-slip protrusion blocks and anti-extrusion protrusion blocks on the upper surface of the top steel plate 1. Among them, the anti-slip protrusion blocks and the anti-extrusion protrusion blocks are arranged at intervals. The anti-slip protrusion blocks are made of the same material as the top steel plate 1. When pasting the anti-slip protrusion blocks, etch the upper surface of the top steel plate 1 and the lower surface of the anti-slip protrusion blocks to make the surface rough, and use steel plate bonding glue for bonding. The anti-extrusion protrusion blocks are made of chloroprene rubber, and the anti-extrusion protrusion blocks are higher than the anti-slip protrusion blocks;

[0069] Step 1.3: Paste a buffer rubber pad at the bottom end of the bottom steel plate 3;

[0070] Step 2: Use of the temporary bearing:

[0071] Step 2.1: Mark the contour lines of the bottom end and the top end of the beam body 5 on the first pier and the second pier. Place 2 temporary bearings on the bearing pad stone on the first pier, and place 2 temporary bearings on the bearing pad stone on the second pier adjacent to the first pier. Fix the bottom surface of the temporary bearing on the upper surface of the bearing pad stone. The bottom steel plate 3 of the temporary bearing is fixed on the upper surface of the bearing pad stone through two anchoring grooves. Among them, the distance between the edge of the temporary bearing on the first pier and / or the second pier and the contour line of the bottom end of the beam body 5 is 5 cm;

[0072] Step 2.2: Use the beam hoisting equipment to hoist the beam body 5 above the first pier and the second pier. Adjust the direction and angle of the beam hoisting equipment so that the contour line of the bottom end of the beam body 5 is directly opposite to the bottom end of the beam body 5. Check the upper surface of the bearing pad stones on the first pier and the second pier, and check the firmness of the temporary bearings. The beam hoisting equipment uses a bridge girder erecting machine;

[0073] Step 2.3: Pre-lower the beam body 5. The beam hoisting equipment synchronously lowers the beam body 5 until the bottom surface of the beam body 5 abuts against all the temporary bearings. Mark the height of the beam body 5 on the first pier and the height on the second pier. Combine the heights of the first pier, the second pier and the temporary bearings to determine whether the height of the beam body 5 is normal, and check whether all the temporary bearings are damaged;

[0074] Step 2.4: Lower the beam body. The beam hoisting equipment continues to synchronously lower the beam body until the beam body presses on all the temporary bearings;

[0075] Step 2.5, the sling of the beam hoisting equipment continues to be connected to the beam. At this time, the beam hoisting equipment has no lifting force.

[0076] Step 2.6, the simply supported state of the beam is transformed into a continuous state. The support steel plates on the temporary bearings are removed by oxyacetylene cutting to complete the removal of the temporary bearings, and the beam is erected on the permanent bearings.

[0077] As an improvement, in Step 2.3, after the bottom surface of the beam 5 abuts against all the temporary bearings, wooden inclined struts are erected on the top of the bearing pads of the beam 5, the first pier and the second pier to assist in stabilization. The angle of the wooden inclined struts is 45 - 60°. After the beam 5 is lowered, the beam 5 presses on all the temporary bearings, and the wooden inclined struts are disassembled.

[0078] In Step 2.3, in order to ensure that the beam 5 is not damaged by touching sharp objects during the movement, buffer foam is wrapped at the convex corner positions of the beam 5; in Step 2.4, the buffer foam wrapped at the convex corner positions of the beam 5 is removed to facilitate the lowering of the beam 5 onto the temporary bearings. Embodiment

[0079] In Step 2.1, before placing the temporary bearings, it also includes the step of treating the top of the bearing pad:

[0080] Step 2.11, the upper surface of the top of the bearing pad is polished to make the upper surface of the top of the bearing pad relatively horizontal;

[0081] Step 2.12, prepare the anti-carbonation coating. Use 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 dispersant, 0.1 part of defoamer and 0.1 part of stabilizer. The above components are by mass. The above components are mixed and stirred until emulsified to obtain the anti-carbonation coating;

[0082] Step 2.13, use a paint spray gun to spray on the upper surface and the side wall surface of the top of the bearing pad. After spraying, wait for the anti-carbonation coating to air dry naturally, spray again, wait for the anti-carbonation coating to air dry naturally, and spray the anti-carbonation coating for the third time until the anti-carbonation coating air dries naturally to complete the spraying of the anti-carbonation coating. Embodiment

[0083] In Step 1, it also includes the step of fixing a pressure sensor on the top steel plate 1.

[0084] In Step 2.3, collect the pressure values of the temporary bearings on the first pier and the second pier to confirm that the gravity of the beam is not all pressed on the temporary bearings.

[0085] In Step 2.4, the pressure values of the temporary bearings on the first pier and the second pier are collected again to confirm that the gravity of the beam body is fully applied to the temporary bearings.

[0086] In the actual application process, the pressure value of each temporary bearing is displayed on the display interface of the beam hoisting equipment operator. The operator judges the stress state of each temporary bearing according to the pressure value displayed on the display interface, and thereby controls the operation of the beam hoisting equipment.

[0087] The present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims.

Claims

1. A simply supported and then continuous beam-slab temporary support, characterized in that, it includes: a top steel plate, the upper surface of the top steel plate abuts against the bottom end of the beam body to support the beam body; a support steel plate, the upper end of the support steel plate is fixedly connected to the top steel plate; a bottom steel plate, the lower end of the support steel plate is fixedly connected to the bottom steel plate, and the lower surface of the bottom steel plate abuts against the top of the cushion stone; a cutting groove, fixedly arranged on the outside of the support steel plate to guide the oxygen-acetylene cutting device; the top steel plate is provided with anti-slip protrusions and anti-extrusion protrusions, and the anti-extrusion protrusions are made of rubber material; the anti-extrusion protrusions are arranged among the anti-slip protrusions; a buffer rubber pad is fixedly arranged at the bottom end of the bottom steel plate; the support steel plate includes 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 includes a first fixing plate, a second fixing plate and a 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° first inclined plane, the upper end of the fixing round steel is fixed on the first inclined plane by spot welding, the second fixing plate is provided with a -45° second inclined plane, the lower end of the fixing round steel is fixed on the second inclined plane by spot welding, and the bottom end of the second fixing plate is fixed on the upper surface of the bottom steel plate.

2. A method for using the simply supported and then continuous beam-slab temporary support according to claim 1, characterized in that, it includes the following steps: Step 1, fabrication of the temporary support: Step 1.1, determine the height of the temporary support according to the height difference between the bottom end of the beam body and the top of the cushion stone, weld the first support steel plate between the top steel plate and the bottom steel plate, weld the first fixing plate, the second fixing plate and the fixing round steel into the second support steel plate, weld the second support steel plate between the top steel plate and the bottom steel plate, and weld the cutting groove on the first support steel plate by spot welding; Step 1.2, paste the prefabricated anti-slip protrusion blocks and anti-extrusion protrusion blocks on the upper surface of the top steel plate, wherein, the anti-slip protrusion blocks and the anti-extrusion protrusion blocks are arranged at intervals, the anti-extrusion protrusion blocks are made of chloroprene rubber material, and the anti-extrusion protrusion blocks are higher than the anti-slip protrusion blocks; Step 1.3, paste a buffer rubber pad at the bottom end of the bottom steel plate and fix a pressure sensor on the top steel plate; Step 2, use of the temporary support: Step 2.1, mark the contour lines of the bottom end and the top end of the beam body on the first pier and the second pier, place 2 temporary supports on the top of the cushion stone of the first pier, place 2 temporary supports on the top of the cushion stone of the second pier adjacent to the first pier, and fix the bottom surface of the temporary support on the upper surface of the cushion stone, 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 beam body is 5 cm; Step 2.2, use a beam body hoisting device to hoist the beam body above the first pier and the second pier, adjust the direction and angle of the beam body hoisting device so that the contour line of the bottom end of the beam body is directly opposite to the bottom end of the beam body; Step 2.3, pre-lower the beam body. The beam hoisting equipment synchronously lowers the beam body until the bottom surface of the beam body abuts against all the temporary bearings. After the bottom surface of the beam body abuts against all the temporary bearings, wooden inclined braces are erected on the top of the bearing pads of the beam body, the first pier and the second pier to assist in stabilization. The angle of the wooden inclined braces is 45 - 60°. Calibrate the height of the beam body on the first pier and the height on the second pier, check whether all the temporary bearings are damaged, and collect the pressure values of the temporary bearings on the first pier and the second pier to confirm that the gravity of the beam body is not entirely borne by the temporary bearings; Step 2.4, lower the beam body. The beam hoisting equipment continues to synchronously lower the beam body until the beam body presses on all the temporary bearings. Collect the pressure values of the temporary bearings on the first pier and the second pier again to confirm that the gravity of the beam body is entirely borne by the temporary bearings; Step 2.5, the sling of the beam hoisting equipment continues to be connected to the beam body. At this time, the beam hoisting equipment has no lifting force; Step 2.6, convert the simply supported state of the beam body into a continuous state. Use oxygen-acetylene to cut off the support steel plates on the temporary bearings along the cutting grooves, complete the removal of the temporary bearings, and the beam body is erected on the permanent bearings.

3. The method for using the simply supported and then continuous beam slab temporary bearing according to claim 2, characterized in that, in step 2.1, before placing the temporary bearing, it further includes the step of treating the top of the bearing pad: Step 2.11, polish the upper surface of the bearing pad to make the upper surface of the bearing pad relatively horizontal; Step 2.12, prepare the anti-carbonation coating. Use 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 dispersant, 0.1 part of defoamer and 0.1 part of stabilizer. The above components are in terms of mass. Mix and stir the above components until they are in a milky state to obtain the anti-carbonation coating; Step 2.13, use a paint spray gun to spray on the upper surface and the side wall surface of the bearing pad. After spraying, wait for the anti-carbonation coating to air dry naturally, spray again, wait for the anti-carbonation coating to air dry naturally, and spray the anti-carbonation coating for the third time until the anti-carbonation coating air dries naturally to complete the spraying of the anti-carbonation coating.

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