A beam end sliding auxiliary device for beam drop construction and use method thereof

Abstract

The present invention relates to an end beam sliding auxiliary device for beam dropping construction and a method for using the device. The device has a height greater than the height of a beam end support and includes pad stones that can be fixed on both sides of the beam end support on a bridge abutment. A heating element is embedded in the pad stone, and the heating element can heat the pad stone to a hot-melt state. A support element is fixed to the top surface of the pad stone, and a groove is provided on the top surface of the support element. A plurality of rollers are provided in the groove, and the rollers can roll in the groove along the longitudinal direction of the bridge. The diameter of the rollers is greater than the depth of the groove. The sliding auxiliary device of the present invention can effectively prevent the steel box girder from damaging the beam end support during beam dropping construction.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering bridges, and in particular to a beam end sliding auxiliary device for beam drop construction and a use method thereof. Background Art

[0002] Steel-concrete composite box girder is a new type of structure developed on the basis of steel structure and concrete structure. It consists of an upper reinforced concrete slab and a lower steel box girder. The concrete slab and the steel box girder are connected by shear connectors. The upper concrete slab bears the compressive stress of the beam body, and the lower steel box girder bears the tensile force. Since this structure can better exert the material properties, and has the advantages of small deadweight, good seismic resistance and durability, and convenient construction, it is widely used in highway bridge construction.

[0003] However, for steel-concrete composite continuous beams, since they are hyperstatic structural systems, in the negative bending moment area, the combined action between the steel beam and the concrete slab will put the composite beam in an unfavorable state where the concrete is in tension and the steel beam is in compression, which can easily cause the concrete slab to crack. At present, the engineering community often uses the "beam drop method" to avoid this problem for steel-concrete composite continuous beams. The "beam drop method" is to use pier top pads during the installation of the steel box girder to make the top surface of the main pier support about 50cm higher than the design elevation, and then pour the concrete slab. After the concrete strength and age meet the design requirements, the pier top pads are removed to sink the pier top main beam by 50cm, so that the top concrete slab is in a compressed state to avoid cracks.

[0004] The inventors found that although the "beam dropping method" can effectively prevent the concrete slab from cracking prematurely, during the beam dropping process on the top of the main pier, the main beam on the top of the main pier drops 50 cm, causing the main beam to extend longitudinally and the end of the main beam to produce longitudinal displacement along the direction of the bridge. Although the displacement is not large, due to the friction resistance of the end supports of the main beam, it is very easy to cause longitudinal shear damage to the end supports of the beam, affecting the overall quality of the structure. There is currently no better solution. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an end beam sliding auxiliary device for beam dropping construction, which can effectively avoid the longitudinal shear damage of the beam end support caused by the longitudinal displacement of the main beam end during the beam dropping construction process.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A beam-dropping construction end beam sliding auxiliary device, whose height is greater than the height of the beam end support, comprises pad stones that can be fixed on both sides of the beam end support on the abutment, wherein a heating element is embedded in the pad stone, and the heating element can heat the pad stone to a hot-melt state, and a support element is fixed to the top surface of the pad stone, and a groove is provided on the top surface of the support element, and a plurality of rollers are provided in the groove, and the rollers can roll in the groove along the longitudinal direction of the bridge, and the diameter of the rollers is greater than the depth of the groove.

[0008] Furthermore, the cushion stone is cast by sulfur mortar.

[0009] Furthermore, the heating element is a resistance wire.

[0010] Furthermore, a plurality of rollers are arranged along the length direction of the groove, the length direction of the groove is parallel to the longitudinal direction of the bridge, and the axes of the rollers are arranged perpendicular to the longitudinal direction of the bridge.

[0011] Furthermore, the support member is a rectangular parallelepiped structure, made of steel, and has a groove on its top surface.

[0012] Furthermore, the side of the support member parallel to the longitudinal direction of the bridge is marked with scale lines for measuring the longitudinal sliding distance of the beam end.

[0013] The present invention also discloses a method for using a beam end sliding auxiliary device in beam drop construction, comprising the following steps:

[0014] Step 1: Pour pad stones on both sides of the beam end support on the abutment. After the pad stones reach the set strength, install the support parts.

[0015] Step 2: Place multiple rollers inside the grooves of the support.

[0016] Step 3: hoist the steel box girder of the side span at the end of the bridge and place it on rollers, and use the beam end sliding auxiliary device for the beam drop construction to support the steel box girder of the side span of the bridge.

[0017] Step 4: Joint the steel box girders of the side span and the middle span of the bridge, pour the concrete bridge deck after jointing, and then drop the steel box girders of the middle span of the bridge. The steel box girders of the middle span of the bridge squeeze the steel box girders of the side span of the bridge, and the steel box girders of the side span of the bridge slide along the support members through rollers.

[0018] Step 5: After the steel box girder of the middle span of the bridge is lowered, start the heating element to heat the cushion stone. The cushion stone is gradually heated to a hot-melt state. The steel box girder of the side span falls onto the beam end support. After the beam end support supports the steel box girder, remove the support elements and rollers, and clean the hot-melt cushion stone.

[0019] Furthermore, before performing step 3, engine oil is evenly applied to the side groove surface of the groove to prevent the two ends of the roller from getting stuck in the groove.

[0020] Furthermore, in step 2, after the roller is placed in the groove, it is positioned and fixed using a positioning piece. In step 3, after the roller supports the steel box girder, the positioning piece is removed.

[0021] Furthermore, the positioning piece is a wedge-shaped wooden block.

[0022] Beneficial effects of the present invention:

[0023] 1. The sliding auxiliary device of the present invention has a simple structure, and the overall height of the support mechanism is greater than the height of the beam end support. When the steel box girder of the middle span is undergoing beam dropping construction, the sliding auxiliary device can be used to support the steel box girder of the side span so that the steel box girder of the side span does not contact the beam end support. Under the action of the roller, the steel box girder can slide longitudinally along the support member. Since the steel box girder does not contact the beam end support, its longitudinal sliding will not cause longitudinal shear damage to the beam end support. The cushion stone can be gradually melted under the action of the heating member, so that the steel box girder can slowly fall onto the beam end support. The construction is convenient and quick, which greatly improves the construction efficiency, saves construction time, and has good engineering economy.

[0024] 2. The sliding auxiliary device of the present invention adopts sulfur mortar pad stone, which has high strength at room temperature and can stably support the steel box girder. It can be melted and softened after being heated, so that the steel box girder can be slowly dropped to the beam end support, avoiding damage to the beam end support by the steel box girder.

[0025] 3. The sliding auxiliary device of the present invention has scale lines on the side of the support member, which can detect the longitudinal sliding distance of the beam end during the beam dropping construction, and can assist in checking the safety and quality of the beam dropping. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0027] Figure 1 It is a schematic side view of the overall structure of Example 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0029] Figure 3 It is a side view schematic diagram of the sliding auxiliary device in use state of embodiment 2 of the present invention;

[0030] Figure 4This is a schematic front view of the sliding assisting device in use according to Embodiment 2 of the present invention;

[0031] Among them, 1. pad stone, 2. support, 3. groove, 4. roller, 5. scale line, 6. beam end support, 7. support pad, 8. abutment, 9. steel box girder. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0035] As introduced in the background technology, during the existing beam dropping construction, the steel box beam of the side span will produce longitudinal displacement, which is easy to cause longitudinal shear damage to the beam end support. To solve the above problem, this application proposes a beam end sliding auxiliary device for beam dropping construction.

[0036] In a typical implementation example 1 of the present application, Figure 1-2 As shown, a beam end sliding auxiliary device for beam drop construction includes a pad stone 1 for being arranged on one side of the beam end support. The pad stone is a rectangular structure with a size of 50cmX50cmX25cm, and is cast with sulfur mortar. A heating element is embedded inside the pad stone, and the heating element adopts a resistance wire. At room temperature, the pad stone has high strength and can provide stable supporting force. Under the heating action of the resistance wire, the pad stone can be gradually heated to a hot-melt state by the resistance wire, and softened by heat, and cannot provide sufficient supporting force.

[0037] A support member 2 is fixed to the top surface of the cushion stone. The support member is a rectangular structure made of steel, and the bottom size is the same as the top size of the cushion stone. A groove 3 is provided on the top surface of the support member. The width of the groove is 40 cm and the depth is 2.5 cm. The length direction of the groove is parallel to the longitudinal direction of the bridge. Four rollers 4 are placed in the groove. The length of the roller is 39 cm, which is slightly smaller than the width of the groove. The diameter of the roller is 5 cm, which is larger than the depth of the groove, so that the top of the roller can extend above the support member. The axis of the roller is perpendicular to the longitudinal direction of the bridge, so that the roller can roll in the groove along the longitudinal direction of the bridge.

[0038] The outer side surface of the support member parallel to the longitudinal direction of the bridge is provided with scale lines 5, which are arranged along the longitudinal direction of the bridge, and the distance between adjacent scale lines is 5 mm, and is used to measure the sliding distance of the steel box girder along the longitudinal direction of the bridge.

[0039] In this embodiment, the sliding auxiliary device composed of the pad stone, support and roller is installed behind the abutment with an overall height higher than the top surface of the beam end support 6 by about 1 cm, so that the sliding auxiliary device can support the steel box girder without the bottom surface of the steel box girder contacting the top surface of the beam end support.

[0040] Embodiment 2:

[0041] This embodiment discloses a method for using a beam end sliding auxiliary device for beam drop construction: Figure 3-4 As shown, a support pad 7 is cast on the abutment 8 at the beam end in advance, and after the support pad reaches the set strength, the beam end support is fixed on the support pad. The method for using the beam end sliding auxiliary device for beam drop construction includes the following specific steps:

[0042] Step 1: Use sulfur mortar to pour pad stones at the abutments on both sides of the beam end support. During pouring, embed resistance wires inside the pad stones. The pad stones on both sides of the beam end support are symmetrically distributed relative to the beam end support. After the pad stones reach the set strength, fix the support members on the top surface of the pad stones.

[0043] Step 2: Apply engine oil evenly on the two side groove surfaces of the support groove, and evenly arrange the four rollers in the middle position inside the groove. The axes of the four rollers are set perpendicular to the longitudinal direction of the bridge, and the four rollers are temporarily positioned and fixed using positioning pieces. Preferably, the positioning piece is a wedge-shaped wooden block, and the engine oil acts as a lubricant to prevent the two ends of the rollers from getting stuck in the groove.

[0044] Step 3: Lift the steel box girder 9 of the side span at the end of the bridge. After lifting the steel box girder to the set position, place it on the roller of the support. Use the beam end sliding auxiliary device for the beam drop construction to support the steel box girder. Remove the wedge-shaped wooden block. At this time, the sliding auxiliary device supports the steel box girder. Since the height of the sliding auxiliary device is greater than the height of the beam end support, the steel box girder does not contact the beam end support.

[0045] Step 4: After the sliding auxiliary device supports the steel box girder of the side span of the bridge, draw a marking line on the steel box girder of the side span of the bridge, and then join the steel box girder of the side span and the steel box girder of the middle span of the bridge. After joining, pour the concrete bridge deck. After the concrete bridge deck is poured, the steel box girder of the middle span of the bridge is lowered. During the beam lowering construction process, the steel box girder of the middle span squeezes the steel box girder of the side span, and the steel box girder of the side span slips along the longitudinal direction of the bridge and slides along the support under the action of the roller. The position of the marking line before and after sliding is recorded using the scale line to obtain the sliding distance of the steel box girder of the side span of the bridge.

[0046] Step 5: After the steel box girder lowering construction of the middle span of the bridge is completed, the resistance wire is energized and started to heat the cushion stone. The cushion stone is gradually transformed into a hot-melt state by the heat and becomes soft by the heat. It cannot provide sufficient support for the steel box girder. The steel box girder slowly falls until it falls on the beam end supports. The beam end supports support the steel box girder. During the heating of the cushion stone, the hot-melt sulfur mortar is cleaned manually. When the beam end supports support the steel box girder of the side span of the bridge, the support members and rollers are removed, and the residual sulfur mortar is cleaned.

[0047] By adopting the sliding auxiliary device of this embodiment, when the steel box girder of the middle span of the bridge is lowered, due to the supporting effect of the sliding auxiliary device, the beam end supports do not contact the steel box girder of the side span, and the longitudinal movement of the steel box girder of the side span will not cause longitudinal shear damage to the beam end supports. After the beam lowering construction is completed, the cushion stone is heated and converted into a hot-melt state and softened, which can enable the steel box girder to slowly fall onto the beam end supports. The construction is convenient, the construction efficiency is improved, the construction time is saved, and it has good engineering economy.

[0048] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for using a beam end sliding auxiliary device for beam drop construction, wherein the height of the beam end sliding auxiliary device for beam drop construction is greater than the height of the beam end support, the beam end sliding auxiliary device for beam drop construction comprises a pad stone that can be fixed on both sides of the beam end support on the abutment, a heating element is embedded in the pad stone, and the heating element can heat the pad stone to a hot-melt state, a support element is fixed on the top surface of the pad stone, a groove is provided on the top surface of the support element, a plurality of rollers are provided in the groove, the rollers can roll in the groove along the longitudinal direction of the bridge, and the diameter of the rollers is greater than the depth of the groove; The cushion stone is cast by sulfur mortar; The heating element adopts a resistance wire; A plurality of rollers are arranged along the length direction of the groove, the length direction of the groove is parallel to the longitudinal direction of the bridge, and the axes of the rollers are arranged perpendicular to the longitudinal direction of the bridge; The support member is a rectangular parallelepiped structure, made of steel, and has a groove on its top surface; The side of the support member parallel to the longitudinal direction of the bridge is marked with scale lines for measuring the longitudinal sliding distance of the beam end; The overall height of the sliding auxiliary device composed of the pad stone, support member and roller installed behind the abutment is higher than the top surface height of the beam end support; The following steps are involved: Step 1: Pour the pad stones on both sides of the beam end support on the abutment, and install the support parts after the pad stones reach the set strength; Step 2: Place multiple rollers inside the grooves of the support; Step 3: hoisting the steel box girder of the side span of the bridge end, placing it on the roller, and supporting the steel box girder of the side span of the bridge by using the beam end sliding auxiliary device for beam drop construction; Step 4: The steel box girders of the side span and the middle span of the bridge are closed, and the concrete bridge deck is poured after closing. Then, the steel box girders of the middle span of the bridge are dropped, and the steel box girders of the middle span of the bridge squeeze the steel box girders of the side span of the bridge, and the steel box girders of the side span of the bridge slide along the support members through rollers; Step 5: After the steel box girder of the middle span of the bridge is lowered, start the heating element to heat the cushion stone. The cushion stone is gradually heated to a hot-melt state. The steel box girder of the side span falls onto the beam end support. After the beam end support supports the steel box girder, remove the support elements and rollers, and clean the hot-melt cushion stone.

2. The method for using the beam end sliding auxiliary device in beam dropping construction as claimed in claim 1, characterized in that: Before performing step 3, evenly apply engine oil on the side groove surface of the groove to prevent the two ends of the roller from getting stuck in the groove.

3. The method for using the beam end sliding auxiliary device in beam dropping construction as claimed in claim 1, characterized in that: In the step 2, after the roller is placed in the groove, it is positioned and fixed by using a positioning piece. In the step 3, after the roller supports the steel box girder, the positioning piece is removed.

4. The method for using the beam end sliding auxiliary device in beam drop construction as claimed in claim 3, characterized in that: The positioning piece is a wedge-shaped wooden block.

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