Non-cast-in-situ fabricated corrugated steel web composite beam and processing method thereof

Abstract

The present application relates to a kind of cast-in-situ assembly type corrugated steel web composite beam and its processing method, comprising the following steps: using embedded connecting piece fixing device to fix several connecting pieces in straight line arrangement, one end of connecting piece is embedded in pre-poured concrete bottom plate, welding wing plate and connecting piece are connected, special nut is pressed into the opening of welding wing plate by hydraulic device, so that connecting piece and welding wing plate are fixed.The beneficial effects of the present application are: the effect of fixing concrete top plate and corrugated steel web achieved by pouring concrete is solved by connecting piece, so that the assembly type corrugated steel web bridge completely realizes 0 concrete pouring in construction site;the top end of connecting piece is connected with connecting piece fixing member through flat thread, so that the axial and radial load capacity of the connecting structure is excellent, ensuring the safety of project use.

Description

Technical Field

[0001] This invention belongs to the field of building profile technology, and particularly relates to a non-cast-in-place prefabricated corrugated steel web composite beam and its processing method. Background Technology

[0002] Concrete composite beams generally refer to a beam structure composed of steel beams and reinforced concrete slabs connected by shear connectors to jointly bear loads. They possess advantages such as high load-bearing capacity, high stiffness, and convenient construction, and are widely used in architecture and bridge construction. Corrugated steel web composite beams have the advantages of relatively thin corrugated steel webs, resulting in significant weight reduction; furthermore, their corrugated shape provides stronger shear buckling and shear resistance for the same thickness, making them widely used in long-span bridge structures.

[0003] Currently, there are two main methods for installing corrugated steel web composite beams: one involves setting up supports on the side of the piers and pouring concrete base and top slabs section by section while simultaneously installing the corrugated steel webs; the other involves prefabricating the concrete base and top slabs in a factory, transporting them to the construction site, and then pouring and connecting the concrete slabs and steel webs, as well as the joints between the concrete slabs. Existing technologies, such as CN110506226, only make structural improvements to existing composite beam installation methods to mitigate the consequences of uneven stress on the bridge. Neither of these methods considers the fact that both methods require on-site concrete pouring, which can be impossible or produce unsatisfactory results at certain construction sites due to environmental and site conditions.

[0004] Therefore, there is an urgent need for a new composite beam structure and its processing method to overcome the problem of concrete pouring at the joint between the concrete base plate and the corrugated steel web during the installation of conventional prefabricated corrugated steel web composite beams. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a precast corrugated steel web composite beam without cast-in-place concrete and its processing method.

[0006] This non-cast-in-place prefabricated corrugated steel web composite beam includes: connectors, a precast concrete base slab, and corrugated steel web; the ends of the corrugated steel web are provided with welded flanges;

[0007] One end of the connector is cast into the pre-cast concrete base slab;

[0008] The connector has a threaded section in the middle, and the welding wing plate has an opening corresponding to the connector. The connector passes through the opening in the welding wing plate, and a special nut is fixed in the opening of the welding wing plate.

[0009] Preferably, a row of connectors is provided on each side of the corrugated steel web, and the two rows of connectors are symmetrically arranged, with the connectors located on the outer side of the corrugation of the corrugated steel web.

[0010] The construction method for this type of precast corrugated steel web composite beam without cast-in-place concrete includes the following steps:

[0011] Step 1: Use the pre-embedded connector fixing device to fix several connectors in a straight line, with one end of the connector placed in the mold of the pre-poured concrete base plate;

[0012] Step 2: Pour the pre-cast concrete base slab, so that one end of the connector is embedded in the pre-cast concrete base slab, and remove the pre-embedded connector fixing device.

[0013] Step 3: Make openings on the welding flange corresponding to the connectors, and connect them through the connectors;

[0014] Step 4: Use a hydraulic device to press a special nut into the opening of the welding wing plate to fix the connector and the welding wing plate.

[0015] Preferably, the pre-embedded connector fixing device includes a symmetrical box-shaped structure and tie rods. A set of symmetrical box-shaped structures are fitted onto the tie rods, and the symmetrical box-shaped structures are assembled to form several placement slots arranged in a straight line. Along the length of the symmetrical box-shaped structure, several tie rods and placement slots are spaced apart. A tie nut is provided on each side of the symmetrical box-shaped structure on the tie rod, and the tie nuts press and fix the symmetrical box-shaped structure from both sides. In step one, the threaded section in the middle of the connector is connected to the placement slot, so that all connectors are arranged in a straight line.

[0016] Preferably, the hydraulic device includes a pressure implementing outer shell and a fixed inner shell; the pressure implementing outer shell is fitted over the fixed inner shell. In step four, the special nut is first fitted onto the connector and moved to the opening of the welding wing plate. Then, the pressure implementing outer shell and the fixed inner shell are fitted onto the connector. The hydraulic device presses against the special nut. After the connector is fixed by the fixed inner shell, pressure is applied to the pressure implementing outer shell to press the special nut into the gap between the opening of the welding wing plate and the connector.

[0017] Preferably, the special nut includes a threaded section and a cylindrical section, the outer diameter of the cylindrical section matches the opening diameter of the welding flange, and the outer diameter of the threaded section is larger than the opening diameter of the welding flange; the threaded section of the special nut is connected to the threaded section in the middle of the connector.

[0018] The beneficial effects of this invention are:

[0019] 1) This invention solves the problem of fixing the concrete top slab and corrugated steel web plate by means of a connector, which is the desired effect of concrete pouring. This allows the prefabricated corrugated steel web plate bridge to achieve zero concrete pouring on the construction site. The top of the connector is connected to the connector fastener by a flat thread, which makes the axial and radial load capacity of the connection structure excellent. It also has better fatigue resistance than ordinary threads and will not loosen or rotate over time. The fixing strength between the corrugated steel web plate and the concrete bottom slab connected by the steel structure is equivalent to the strength of concrete pouring, ensuring the safety of the project.

[0020] 2) This invention proposes a pre-embedded connector fixing device. The position of the reinforcing bar is determined by pre-reserved grooves obtained by symmetrical box-shaped structure splicing. Through tie rods are arranged in the transverse direction of the structure. The position change of the reinforcing bar is minimized during the pouring process by tightening the tie nuts and the rigidity of the material. This achieves the technical requirement of high precision in the connection process of steel structure. The position of the connector is completely fixed during the pouring of the pre-embedded connector into the pre-poured concrete base plate, so that the required accuracy of the connector position during the assembly process is guaranteed.

[0021] 3) This invention proposes a hydraulic device for pressing a special nut into the gap between the connector and the welded wing plate opening, which further improves the strength of the connection between the connector and the welded wing plate. This special nut, which cannot be unloaded by screwing, can effectively resist the vibration brought by the vehicle driving, eliminate the adverse consequences caused by the loosening of the screw due to vibration, and has excellent radial and axial load capacity. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the assembled segments of the composite beam.

[0023] Figure 2 A schematic diagram of the connection node between the corrugated steel web and the concrete slab;

[0024] Figure 3 A schematic diagram of a corrugated steel web and its welded flanges;

[0025] Figure 4 Schematic diagram of pre-embedded connectors and special nuts;

[0026] Figure 5 An exploded view of a fixed device with connecting parts;

[0027] Figure 6 A schematic diagram illustrating the effective fixing and precise positioning of the connectors on the casting template using a fixing device.

[0028] Figure 7 This is a schematic diagram of a hydraulic device pressing against a specially designed nut.

[0029] Figure 8 This is a schematic diagram of a hydraulic device pressing a specially designed nut into an opening in a welded flange.

[0030] Explanation of reference numerals in the attached drawings: 1. Pressure implementing outer shell; 2. Fixed inner shell; 2. Symmetrical box structure; 202. Connecting piece; 203. Pull nut; 204. Pull screw; 205. Special nut; 206. Welded wing plate; 207. Corrugated steel web plate; 208. Precast concrete base plate; 209. Detailed Implementation

[0031] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0032] Example 1

[0033] As one example, such as Figures 1 to 6 As shown, this precast corrugated steel web composite beam without cast-in-place concrete connects the precast concrete base plate 209 and the corrugated steel web 208 through a high-strength steel structure connection. This achieves the best possible effect by replacing the concrete pouring required at the joint between the concrete base plate and the corrugated steel web 208 during the installation of conventional precast corrugated steel web composite beams, thus achieving the goal of construction without cast-in-place concrete.

[0034] This non-cast-in-place prefabricated corrugated steel web composite beam includes: connector 203, precast concrete base plate 209, and corrugated steel web 208; the ends of the corrugated steel web 208 are provided with welded flanges 207; the welding positions of the corrugated steel web 208 and the welded flanges 207 should, as far as possible, ensure that the width center axis coincides in the top view, so as to make the overall stress structure more reasonable and increase stability.

[0035] One end of the connector 203 is connected to a connector fixing member by a thread. In this embodiment, the connector fixing member is disc-shaped and is cast in the pre-cast concrete base plate 209.

[0036] The connector 203 has a threaded section in the middle, and the welding flange 207 has an opening corresponding to the connector 203. The connector 203 passes through the opening in the welding flange 207, and a special nut 206 is fixed in the opening of the welding flange 207. The welding flange 207 should have a hole with the same cross-sectional dimensions as the connector 203, and the inner wall of the hole should be machined with a flat thread of the same specification as the connector to connect with the connector 203. In addition, the production and processing of the corrugated steel web 208 and its welding flange 207 are also completed before construction.

[0037] A row of connectors 203 is provided on each side of the corrugated steel web 208, and the two rows of connectors 203 are symmetrically arranged. The connectors 203 are located on the outer side of the corrugation of the corrugated steel web 208.

[0038] Example 2

[0039] As another embodiment, this second embodiment, based on the first embodiment, proposes a construction method for this non-cast-in-place prefabricated corrugated steel web composite beam, which includes the following steps:

[0040] Step 1: Use the pre-embedded connector fixing device to fix several connectors 203 in a straight line. Install the connector fixing device on one end of the connector 203 and place it in the mold of the pre-cast concrete base plate 209. The pre-embedded depth of the connector 203 is not less than 5 / 6 of the preset thickness of the pre-cast concrete base plate 209 opposite to the pre-embedded connector fixing device.

[0041] The pre-embedded connector fixing device includes a symmetrical box-shaped structure 202 and tie rods 205. A set of symmetrical box-shaped structures 202 are fitted onto the tie rods 205, and the symmetrical box-shaped structures 202 are assembled to form several placement slots arranged in a straight line. Along the length of the symmetrical box-shaped structure 202, several tie rods 205 and placement slots are spaced apart. A tie nut 204 is provided on each side of the symmetrical box-shaped structure 202 on the tie rod 205, and the tie nuts 204 press and fix the symmetrical box-shaped structure 202 from both sides. When positioning the connector 203 and its attached parts, the connector 203 is inserted into the corresponding placement slot. At this time, the connector 203 should be kept absolutely vertical. Then, the tie bolts 205 are tightened so that all connectors 203 are arranged in a straight line. The arrangement of the connectors 203 is parallel to the direction of the bridge deck edge line. When installing, it should be ensured that the line connecting the center of any connector 203 to the same surface is parallel to the bridge edge line.

[0042] The placement groove formed by the tight connection of the symmetrical box structure 202 should be precisely matched with the cross-sectional dimensions of the connector 203. If it is larger than the dimensions of the connector 203, it cannot play a fixing role. The length of the tie rod 205 should be appropriately increased. The inner wall dimensions of the tie nut 204 are the same as those of the tie rod 205, and the thread specifications are the same. A shim or other structure can be appropriately added between the tie nut 204 and the symmetrical box structure 202 to increase the lateral force-bearing area of ​​the symmetrical box structure 202 and achieve better integration.

[0043] Step 2: Pour the pre-cast concrete base slab 209, so that one end of the connector 203 with the connector fixing part 203 is embedded in the pre-cast concrete base slab 209. At this time, the connection between the pre-embedded connector 203 and the pre-cast concrete base slab 209 is greatly improved due to the connector fixing part. Remove the pre-embedded connector fixing device.

[0044] Step 3: An opening is made on the welding flange 207 corresponding to the connector 203. The hole wall is provided with a flat thread of the same specification as the middle part of the connector 203, and it is connected through the connector 203. The connector 203 and the welding flange 207 are coaxially aligned and absolutely vertical. The connector 203 is made of a material with good rigidity, and the connector fastener is used to increase the stability and stress in the pre-cast concrete base slab 209. The middle section of the connector 203 and the position where the hole of the welding flange 207 is connected are provided with a flat thread. The length of the flat thread is not less than 1 / 20 of the length of the reinforcing bar of the connector 203 above and below the contact length with the welding flange 207.

[0045] Step 4: Press a special nut 206 into the opening of the welding wing plate 207 using a hydraulic device to fix the connector 203 and the welding wing plate 207.

[0046] Example 3

[0047] As another implementation, this third embodiment proposes a construction method for a precast corrugated steel web composite beam without cast-in-place concrete, based on the first embodiment:

[0048] like Figure 7 and Figure 8 As shown, the hydraulic device includes a pressure implementing outer shell 1 and a fixed inner shell 2. The pressure implementing outer shell 1 is fitted over the fixed inner shell 2. In step four, the special nut 206 is first fitted onto the connector 203 and moved to the opening of the welding flange 207. Then, the pressure implementing outer shell 1 and the fixed inner shell 2 are fitted onto the connector 203. The hydraulic device presses against the special nut 206. After fixing the connector 203 through the fixed inner shell 2, pressure is applied to the pressure implementing outer shell 1 to press the special nut 206 into the gap between the opening of the welding flange 207 and the connector 203. It should be noted that the hydraulic press ensures that the absolute position of the connector 203 does not change during operation; only the push rod pushes the special nut 206 into the hole of the welding flange 207.

[0049] The special nut 206 includes a threaded section and a cylindrical section. The outer diameter of the cylindrical section matches the opening diameter of the welding flange 207, and the outer diameter of the threaded section is larger than the opening diameter of the welding flange 207. The threaded section of the special nut 206 is connected to the threaded section in the middle of the connector 203.

[0050] The inner diameter of the cylindrical and threaded sections is the same as the diameter of the holes drilled in the connector and flange. The thickness of the cylindrical section wall should not be too large, approximately 1 mm is sufficient. The inner wall of the threaded section is machined with flat threads to increase the contact area of ​​the connector. The wall thickness of the cylindrical section of the special nut 206 is much smaller than the diameter of the hole, ensuring that the special nut 206 can be embedded in the hole for a fixing function.

[0051] After inserting the special nut 206 into the perforated wing plate, the hydraulic device releases the connector 203, and the installation is complete.

[0052] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0053] Example 4

[0054] As another embodiment, this fourth embodiment, based on embodiments one to three, proposes a method for constructing precast corrugated steel web composite beams without cast-in-place concrete:

[0055] Other types of fixing holes, such as triangular or trapezoidal, can be set on the welded flange 207 of the corrugated steel web 208 to meet construction requirements or improve structural strength; the above objectives can be achieved by setting different numbers of holes or their positional relationships.

[0056] By pre-embedding different types of connectors 203, the shape and size of the reserved groove can be changed through the aforementioned fixing and positioning device to match the welded flange 207, thereby achieving the function of fixing the pre-cast concrete base plate 209 and the corrugated steel web plate 208. At this time, the shape of the hole reserved in the welded flange 207 also changes. The inner wall size of the tie nut 204 is the same as the cross-sectional size of the tie rod 205, and the thread specifications of the inner wall of the tie nut 204 and the tie rod 205 are the same, which facilitates their matching and makes the symmetrical box structure 202 sufficiently tight to accurately fix the connector 203 so that it does not deviate from its original position due to external forces during the concrete pouring process, thus interfering with subsequent connection operations. Regarding the symmetrical box structure 202, its upper and lower surfaces should be absolutely horizontal, so that the entire fixing device is stably placed on the concrete pouring template, laying the foundation for pouring.

[0057] By changing the shape of the connector positioning and fixing device to achieve the task of positioning and fixing non-linear reinforcing bars, the device is essentially fixed by the rigidity of the material and the application of lateral external force, in order to adapt to the needs of pre-embedded connectors 203 in different concrete structures. Therefore, the device and method of this application are not limited to connecting the pre-cast concrete base plate 209 and the corrugated steel web plate 208, but can also be used to connect concrete side plates with upper and lower concrete base plates, upper and lower steel plate base plates with steel web plate side plates, and other materials and simple shape changes that require concrete pouring to solidify the joint. In all these cases, this method can be used or attempted to replace pouring.

[0058] The special nut 206 can also transform the structure into other structures, such as a completely cylindrical hollow structure, but its function is still to strengthen the connection between the connector 203 and the welded wing plate 207, and it may also have additional functions such as increasing the contact area.

[0059] Regarding the part where the hydraulic device inserts the special nut 206, a sheet-like or three-dimensional metal component can be used to replace the special nut 206 to completely seal the connection part, achieving the same fixed connection effect. The metal component 1001 is directly pressed onto the welded wing plate 207, thus still achieving a fixing function.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction method for a precast corrugated steel web composite beam without cast-in-place concrete, characterized in that, The precast corrugated steel web composite beam without cast-in-place concrete includes: connectors, a precast concrete base slab and a corrugated steel web; the ends of the corrugated steel web are provided with welded flanges. One end of the connector is cast into the pre-cast concrete base slab; The connector has a threaded section in the middle, and the welding wing plate has an opening corresponding to the connector. The connector passes through the opening in the welding wing plate, and a special nut is fixed in the opening of the welding wing plate. The method includes the following steps: Step 1: Use the pre-embedded connector fixing device to fix several connectors in a straight line, with one end of the connector placed in the mold of the pre-poured concrete base plate; Step 2: Pour the pre-cast concrete base slab, so that one end of the connector is embedded in the pre-cast concrete base slab, and remove the pre-embedded connector fixing device. Step 3: Make openings on the welding flange corresponding to the connectors, and connect them through the connectors; Step 4: Using a hydraulic device, press a special nut into the opening of the welding wing plate to fix the connector and the welding wing plate. The hydraulic device includes a pressure implementing outer shell and a fixing inner shell. The pressure implementing outer shell is fitted over the fixing inner shell. First, the special nut is fitted onto the connector and moved to the opening of the welding wing plate. Then, the pressure implementing outer shell and the fixing inner shell are fitted onto the connector. The hydraulic device presses against the special nut. After fixing the connector through the fixing inner shell, pressure is applied to the pressure implementing outer shell to press the special nut into the gap between the opening of the welding wing plate and the connector.

2. The construction method of the precast corrugated steel web composite beam without cast-in-place concrete as described in claim 1, characterized in that, A row of connectors is provided on each side of the corrugated steel web, and the two rows of connectors are symmetrically arranged. The connectors are located on the outer side of the corrugation of the corrugated steel web.

3. The construction method of the precast corrugated steel web composite beam without cast-in-place concrete as described in claim 1, characterized in that, The pre-embedded connector fixing device includes a symmetrical box-shaped structure and tie rods. A set of symmetrical box-shaped structures are fitted onto the tie rods, and the symmetrical box-shaped structures are assembled to form several placement slots arranged in a straight line. Along the length of the symmetrical box-shaped structure, several tie rods and placement slots are spaced apart. A tie nut is provided on each side of the symmetrical box-shaped structure on the tie rod, and the tie nuts press and fix the symmetrical box-shaped structure from both sides. In step one, the threaded section in the middle of the connector is connected to the placement slot, so that all connectors are arranged in a straight line.

4. The construction method of the precast corrugated steel web composite beam without cast-in-place concrete according to claim 1, characterized in that, The special nut consists of a threaded section and a cylindrical section. The outer diameter of the cylindrical section matches the opening diameter of the welded flange, while the outer diameter of the threaded section is larger than the opening diameter of the welded flange. The threaded section of the special nut is connected to the threaded section in the middle of the connector.

Images