Cast-in-place-free assembly type corrugated steel web composite beam and machining method thereof

Abstract

The machining method comprises the following steps that a plurality of connecting pieces are linearly arranged and fixed through an embedded connecting piece fixing device, one ends of the connecting pieces are embedded in a pre-cast concrete bottom plate, a welding wing plate is connected with the connecting pieces in a penetrating mode, and the welding wing plate is connected with the connecting pieces in a penetrating mode; a special nut is pressed into the hole of the welding wing plate through a hydraulic device, so that the connecting piece and the welding wing plate are fixed. The prefabricated corrugated steel web bridge has the beneficial effects that the effect of fixing the concrete top plate and the corrugated steel web which is expected to be achieved through concrete pouring is achieved through the connecting pieces, and zero-concrete pouring of the prefabricated corrugated steel web bridge on a construction site is completely achieved; the top end of the connecting piece is connected with a connecting piece fixing piece through a flat thread, so that the axial and radial loading capacity of the connecting structure is excellent, and the use safety of a project is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of building profiles, and in particular relates to a non-cast-in-situ assembled corrugated steel web composite beam and a processing method thereof. Background Art

[0002] Concrete composite beams generally refer to a type of beam structure that is composed of steel beams and reinforced concrete slabs through shear connectors and bears loads together. It has the advantages of high bearing capacity, high rigidity, and convenient construction, and is widely used in the fields of construction and bridges. The advantage of composite beams with corrugated steel webs is that the thickness of the corrugated steel web is relatively thin, which greatly reduces the weight; and the corrugated shape has stronger shear buckling and shear resistance at the same thickness, and is widely used in large-span bridge structures.

[0003] There are two methods for installing composite beams with corrugated steel webs: one is to set up a bracket on the side of the pier, cast the concrete bottom plate and top plate in sections, and install the corrugated steel web at the same time; the other is to prefabricate the concrete bottom plate and top plate in the factory, transport them to the construction site, and cast the joints between the concrete plate and the steel web, and between the concrete plates. The prior art, such as CN110506226, only makes structural improvements under the existing composite beam installation method to improve the consequences caused by uneven stress on the bridge. Neither of them considers that the above two casting methods require concrete casting on site, and due to the environment and site of the construction site, concrete casting may not be carried out in some construction sites or the casting effect is not ideal.

[0004] Therefore, a new composite beam structure and a processing method thereof are urgently needed to overcome the problem that during the installation of conventional assembled corrugated steel web composite beams, concrete pouring at the joint between the concrete base plate and the corrugated steel web is required. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a non-cast-in-situ assembled corrugated steel web composite beam and a processing method thereof.

[0006] The non-cast-in-situ assembled corrugated steel web composite beam comprises: a connecting piece, a precast concrete bottom plate and a corrugated steel web; the ends of the corrugated steel web are provided with welded wing plates;

[0007] One end of the connector is cast in the precast concrete base plate;

[0008] A threaded section is arranged in the middle of the connecting piece, an opening is arranged on the welding wing plate corresponding to the connecting piece, the connecting piece passes through the opening on the welding wing plate, and a special nut is fixed in the opening of the welding wing plate.

[0009] Preferably, a row of connecting members is provided on both sides of the corrugated steel web, and the two rows of connecting members are symmetrically arranged, and the connecting members are arranged on the corrugated outer side of the corrugated steel web.

[0010] The construction method of the non-cast-in-situ assembled corrugated steel web composite beam comprises the following steps:

[0011] Step 1: Use a pre-buried connector fixing device to arrange and fix several connectors in a straight line, and place one end of the connector in a mold of a pre-cast concrete base plate;

[0012] Step 2: pouring the precast concrete base plate concrete, so that one end of the connector is embedded in the precast concrete base plate, and removing the precast connector fixing device;

[0013] Step 3: Open holes are set on the welding wing plate corresponding to the connecting pieces, and the holes are connected through the connecting pieces;

[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 embedded connector fixing device includes a symmetrical box-type structure and a tension screw, a group of symmetrical box-type structures are sleeved on the tension screw, and the symmetrical box-type structures are assembled to form several placement grooves arranged in a straight line; along the length direction of the symmetrical box-type structure, several tension screws and placement grooves are arranged at intervals; a tension nut is provided on each side of the symmetrical box-type structure on the tension screw, and the tension nut squeezes and fixes the symmetrical box-type structure from both sides; in step one, the middle threaded section of the connector is connected to the placement groove, 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 sleeved on the outside of the fixed inner shell. In step four, the special nut is first sleeved on the connecting piece and moved to the opening of the welding wing plate, and then the pressure-implementing outer shell and the fixed inner shell are sleeved on the connecting piece. The hydraulic device is pressed against the special nut. After the connecting piece is fixed by the fixed inner shell, the pressure-implementing outer shell is pressurized to press the special nut into the gap between the opening of the welding wing plate and the connecting piece.

[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 wing plate, and the outer diameter of the threaded section is larger than the opening diameter of the welding wing plate; the threaded section of the special nut is connected to the middle threaded section of the connector.

[0018] The beneficial effects of the present invention are:

[0019] 1) The present invention solves the problem of fixing the concrete top plate and the corrugated steel web by concrete pouring through a connector, so that the assembled corrugated steel web bridge can completely achieve zero concrete pouring at the construction site; the top of the connector is connected to a connector fixing member by a flat thread, so that the axial and radial load capacity of the connection structure is excellent, and its fatigue resistance is better than that of ordinary threads, and it will not loosen or rotate over a long period of time, so that the fixing strength between the corrugated steel web and the concrete bottom plate connected by the steel structure is sufficient to be equivalent to the strength of concrete pouring, thereby ensuring the safety of the project.

[0020] 2) The present invention proposes a pre-embedded connector fixing device, which determines the position of the steel bar by splicing a symmetrical box-type structure to obtain a reserved groove, and arranges tension screws that penetrate the structure horizontally. The position change of the steel bar during the pouring process is minimized by tightening the tension nuts and the rigidity of the material, thereby meeting the technical requirements for high precision in the steel structure connection process. The position of the connector is completely fixed during the pouring process of embedding the connector into the pre-cast concrete base plate, so that the accuracy of the connector position required during the assembly process can be guaranteed.

[0021] 3) The present invention proposes a hydraulic device for pressing a special nut into the gap between the connecting piece and the opening of the welded wing plate, thereby further improving the strength of the connection between the connecting piece and the welded wing plate. This special nut that cannot be assembled and disassembled by screws can effectively resist the vibration caused by the running of the vehicle, eliminating the adverse consequences caused by loosening of the screws due to vibration, and has excellent radial and axial load capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the segment of the composite beam after it is assembled;

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

[0024] Figure 3 It is a schematic diagram of a corrugated steel web and a welded wing plate thereon;

[0025] Figure 4 This is a schematic diagram of embedded connectors and special nuts;

[0026] Figure 5 An exploded schematic diagram of the fixture with connectors attached;

[0027] Figure 6 A schematic diagram showing the effectiveness of fixing the fixture on the casting formwork and accurately positioning the connector;

[0028] Figure 7 It is a schematic diagram of the hydraulic device against the special nut;

[0029] Figure 8 Schematic diagram of the special nut pressed into the hole of the welded wing plate for the hydraulic device.

[0030] Explanation of the reference numerals: pressure-implementing outer shell 1, fixed inner shell 2, symmetrical box-type structure 202, connecting piece 203, tension nut 204, tension screw 205, special nut 206, welded wing plate 207, corrugated steel web 208, precast concrete bottom plate 209. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0032] Embodiment 1

[0033] As an example, Figures 1 to 6 As shown, this non-cast-in-situ assembled corrugated steel web composite beam connects the pre-cast concrete base plate 209 and the corrugated steel web 208 through a high-strength steel structure connection, which replaces the need to pour concrete at the joint between the concrete base plate and the corrugated steel web 208 during the installation process of the conventional assembled corrugated steel web composite beam to the greatest extent, thereby achieving the purpose of non-cast-in-situ concrete construction.

[0034] This non-cast-in-situ assembled corrugated steel web composite beam includes: a connecting piece 203, a precast concrete bottom plate 209 and a corrugated steel web 208; a welded wing plate 207 is provided at the end of the corrugated steel web 208; the welding position of the corrugated steel web 208 and the welded wing plate 207 should be as close as possible to the central axis of the width in a top view, so as to make the overall force-bearing 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 a disc-shaped member cast in the precast concrete bottom plate 209;

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

[0037] A row of connecting members 203 is respectively provided on both sides of the corrugated steel web 208 , and the two rows of connecting members 203 are symmetrically arranged. The connecting members 203 are arranged on the corrugated outer side of the corrugated steel web 208 .

[0038] Embodiment 2

[0039] As another embodiment, this embodiment 2 is proposed on the basis of the embodiment 1, and the construction method of this non-cast-in-place assembled corrugated steel web composite beam includes the following steps:

[0040] Step 1: Use the embedded connector fixing device to arrange and fix several connectors 203 in a straight line, install the connector fixing device at one end of the connector 203 and place it in the mold of the precast concrete base plate 209; the embedded depth of the connector 203 is not less than 5 / 6 of the preset thickness of the precast concrete base plate 209 facing the embedded connector fixing device.

[0041] The embedded connector fixing device includes a symmetrical box-type structure 202 and a tension screw 205. A group of symmetrical box-type structures 202 are sleeved on the tension screw 205. The symmetrical box-type structures 202 are assembled to form several placement slots arranged in a straight line. Along the length direction of the symmetrical box-type structure 202, several tension screws 205 and placement slots are arranged at intervals. A tension nut 204 is provided on each side of the symmetrical box-type structure 202 on the tension screw 205. The tension nut 204 squeezes and fixes the symmetrical box-type 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, and then the tension bolts 205 are tightened to arrange all the connectors 203 in a straight line. The arrangement of the connectors 203 is parallel to the edge line of the bridge deck. When placing, it should be ensured that the line connecting the axis of any connector 203 with the surface is parallel to the edge line of the bridge.

[0042] The placement groove formed by the tight combination of the symmetrical box-type structure 202 should accurately match the cross-sectional size of the connecting piece 203. If it is larger than the size of the connecting piece 203, it cannot play a fixing role; the length of the tension screw 205 should be appropriately increased, and the inner wall size of the tension nut 204 should be the same as the size of the tension screw 205, and the thread line specifications are the same; between the tension nut 204 and the symmetrical box-type structure 202, gaskets and other structures can be appropriately added to increase the lateral force area of ​​the symmetrical box-type structure 202 to achieve better integration.

[0043] Step 2: pour concrete for the precast concrete base plate 209, so that one end of the connector 203 with the connector fixing 203 is embedded in the precast concrete base plate 209. At this time, the connection degree between the precast concrete base plate 209 and the precast concrete base plate 209 is greatly improved due to the connector fixing. Remove the precast concrete base plate fixing device.

[0044] Step 3: Set an opening on the welding wing plate 207 corresponding to the connector 203, and the hole wall is provided with a flat thread of the same specification as the middle part of the connector 203, and is connected with the connector 203. The holes of the connector 203 and the welding wing plate 207 are coaxial and absolutely vertical; the connector 203 is made of a material with good rigidity, and a connector fixing part is used to increase the stability and force in the precast concrete base plate 209; a flat thread is arranged at the connection position between the middle section of the connector 203 and the hole of the welding wing plate 207, and the length of the flat thread is not less than 1 / 20 of the length of the steel bar of the connector 203 outside the contact length with the welding wing plate 207.

[0045] Step 4: Use a hydraulic device to press the special nut 206 into the opening of the welding wing plate 207 to fix the connecting piece 203 and the welding wing plate 207.

[0046] Embodiment 3

[0047] As another implementation, this third embodiment proposes, based on the first embodiment, a construction method of this non-cast-in-place assembled corrugated steel web composite beam:

[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 sleeved outside the fixed inner shell 2. In step 4, the special nut 206 is first sleeved on the connecting piece 203 and moved to the opening of the welding wing plate 207, and then the pressure-implementing outer shell 1 and the fixed inner shell 2 are sleeved on the connecting piece 203. The hydraulic device is pressed against the special nut 206. After the connecting piece 203 is fixed by the fixed inner shell 2, the pressure-implementing outer shell 1 is pressurized to press the special nut 206 into the gap between the opening of the welding wing plate 207 and the connecting piece 203. It should be noted that the hydraulic press ensures that the absolute position of the connecting piece 203 does not change during operation, and only the push rod pushes the special nut 206 into the hole of the welding wing plate 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 wing plate 207, and the outer diameter of the threaded section is larger than the opening diameter of the welding wing plate 207; the threaded section of the special nut 206 is connected to the middle threaded section of the connector 203.

[0050] The inner wall diameter of the cylindrical section and the threaded section is the same as the diameter of the hole punched by the connector and the wing plate. The thickness of the cylindrical section wall should not be too large, and can be kept at about 1mm. The inner wall of the threaded section is processed 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 punched hole diameter. This feature ensures that the special nut 206 can be embedded in the punched hole, thereby playing a fixing role.

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

[0052] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0053] Embodiment 4

[0054] As another embodiment, this embodiment 4 proposes, based on the embodiments 1 to 3, that in a cast-in-place assembled corrugated steel web composite beam:

[0055] Other types of fixing holes, such as triangular, trapezoidal, etc., can be set on the corrugated steel web 208 welded wing plate 207 to meet the construction requirements or improve the structural strength; the above purpose can be met by setting different numbers of rows or position relationships of holes.

[0056] By pre-embedding different types of connectors 203, the shape and size of the reserved grooves can be changed through the above-mentioned fixed positioning device to cooperate with the welded wing plate 207, so as to achieve the function of fixing the pre-cast concrete bottom plate 209 and the corrugated steel web 208. At this time, the shape of the hole position reserved by the welded wing plate 207 is also changed. The inner wall size of the tension nut 204 is the same as the cross-sectional size of the tension screw 205, and the inner wall of the tension nut 204 and the tension screw 205 have the same thread line specifications, which is convenient for their matching use to make the symmetrical box-type structure 202 tight enough to accurately fix the connector 203 so that it will not deviate from the original position due to external forces during the concrete pouring process, thereby interfering with subsequent connection operations. Regarding the symmetrical box-type structure 202, its upper and lower surfaces should be absolutely horizontal, so that the entire fixing device can be stably placed on the concrete pouring template to pave the way for pouring.

[0057] By changing the shape of the connector positioning and fixing device to achieve the positioning and fixing task of non-linear steel bars, the device is essentially fixed by material rigidity and with lateral external force to meet the needs of pre-embedded connectors 203 in different concrete structures. Therefore, the device and method of the present application are not limited to connecting pre-cast concrete bottom plate 209 and corrugated steel web 208, but can also be used to connect concrete side plates with concrete upper and lower bottom plates, steel plate upper and lower bottom plates with steel web side plates and other materials and simple shape changes require concrete pouring to consolidate the connection seam, and this method can be used or attempted to be used for alternative pouring.

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

[0059] Regarding the part where the hydraulic device performs the embedding operation on the special nut 206, a sheet-like or three-dimensional metal component can also be used to replace the special nut 206 to completely seal the connecting part to achieve the same fixed connection effect. The metal component 1001 is directly pressed on the welding wing plate 207 so that it can still play a fixing role.

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

Claims

1. A non-cast-in-situ assembled corrugated steel web composite beam, characterized in that: include: connectors, precast concrete slabs and corrugated steel webs; The ends of the corrugated steel webs are provided with welded flanges; One end of the connector is cast in the precast concrete base plate; A threaded section is arranged in the middle of the connecting piece, an opening is arranged on the welding wing plate corresponding to the connecting piece, the connecting piece passes through the opening on the welding wing plate, and a special nut is fixed in the opening of the welding wing plate.

2. The cast-in-place non-assembled corrugated steel web composite beam according to claim 1, characterized in that: A row of connecting pieces is respectively arranged on both sides of the corrugated steel web, and the two rows of connecting pieces are symmetrically arranged, and the connecting pieces are arranged on the corrugated outer sides of the corrugated steel web.

3. The construction method of the non-cast-in-situ assembled corrugated steel web composite beam according to claim 1, characterized in that: The following steps are involved: Step 1: Use a pre-buried connector fixing device to arrange and fix several connectors in a straight line, and place one end of the connector in a mold of a pre-cast concrete base plate; Step 2: pouring the precast concrete base plate concrete, so that one end of the connector is embedded in the precast concrete base plate, and removing the precast connector fixing device; Step 3: Open holes are set on the welding wing plate corresponding to the connecting pieces, and the holes are connected through the connecting pieces; 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.

4. The construction method of the non-cast-in-situ assembled corrugated steel web composite beam according to claim 3, characterized in that: The embedded connector fixing device includes a symmetrical box-type structure and a tension screw rod, a group of symmetrical box-type structures are sleeved on the tension screw rod, and the symmetrical box-type structures are assembled to form several placement grooves arranged along a straight line; along the length direction of the symmetrical box-type structure, several tension screw rods and placement grooves are arranged at intervals; a tension nut is provided on each side of the symmetrical box-type structure on the tension screw rod, and the tension nut squeezes and fixes the symmetrical box-type structure from both sides; in step one, the middle threaded section of the connector is connected to the placement groove so that all connectors are arranged in a straight line.

5. The construction method of the non-cast-in-situ assembled corrugated steel web composite beam according to claim 3, characterized in that: The hydraulic device includes a pressure-implementing outer shell and a fixed inner shell; the pressure-implementing outer shell is sleeved on the outside of the fixed inner shell. In step four, the special nut is first sleeved on the connecting piece and moved to the opening of the welding wing plate, and then the pressure-implementing outer shell and the fixed inner shell are sleeved on the connecting piece. The hydraulic device is pressed against the special nut. After the connecting piece is fixed by the fixed inner shell, the pressure-implementing outer shell is pressurized to press the special nut into the gap between the opening of the welding wing plate and the connecting piece.

6. The construction method of the non-cast-in-situ assembled corrugated steel web composite beam according to claim 3, characterized in that: 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 wing plate, and the outer diameter of the threaded section is larger than the opening diameter of the welding wing plate. The threaded section of the special nut is connected to the middle threaded section of the connector.

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