Prestressed composite beam structure and construction method thereof

Abstract

The invention discloses a prestressed composite beam structure and a construction method thereof.The prestressed composite beam structure comprises a beam body, the beam body comprises a first glued wood board, a second glued wood board and glued bamboo boards, the first glued wood board is horizontally arranged, and the glued bamboo boards are arranged on the lower side of the first glued wood board in parallel at intervals; the second glued wood board is located between the first glued wood board and the glued bamboo board; the aluminum alloy outer frame wraps the periphery of the beam body, mounting grooves are formed in the outer sides of the two ends, in the width direction of the beam body, of the aluminum alloy outer frame correspondingly, and a plurality of rib plates are fixed in the mounting grooves and distributed at intervals in the length direction of the mounting grooves; the prestressed stranded wire penetrates through the multiple rib plates, the two ends of the prestressed stranded wire are fixed to the rib plates at the two ends, in the length direction, of the mounting groove respectively, and the position of the middle, in the length direction, of the prestressed stranded wire is lower than the positions of the two ends of the prestressed stranded wire. The device can be suitable for a coastal high-salt and high-humidity environment, and is light in self weight and high in bearing capacity.

Description

Technical Field

[0001] The invention relates to the technical field of beam structures, and in particular to a prestressed composite beam structure and a construction method thereof. Background Art

[0002] At present, concrete and steel are often used as beam structures in buildings and structures such as houses, factories and bridges, but beam structures made of the above materials all have certain defects. For example, concrete structures have problems such as high energy consumption, low seismic resistance and self-weight, which cannot meet people's demand for lightweight, energy-saving and low-consumption structures; and when steel is used in coastal areas with humid climates, it is easy to rust in a high-salt and high-humidity environment, resulting in performance degradation, which leads to local instability and withdrawal from work when subjected to force. If a waterproof coating is applied, the construction volume is large and the economic cost is high; in addition, aluminum alloy is a material with advantages such as lightness, corrosion resistance and easy processing, but its strength and stiffness are not as good as steel. Aluminum alloy beams may buckle locally or become unstable as a whole when under pressure. In order to meet the bearing capacity requirements, a larger cross-sectional size is often required, which has high economic costs; wooden beams, as a common form of beams, have good pressure bearing capacity and have the advantages of beauty, heat preservation and heat insulation, but wood expands and softens when exposed to water, and it is very easy to lose its bearing capacity when pulled in a humid environment, affecting the safety of the structure.

[0003] Therefore, there is an urgent need for a beam structure that is suitable for the coastal high-salt and high-humidity environment and has light weight and high bearing capacity. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a prestressed composite beam structure, which can be applied to coastal high-salt and high-humidity environments, has light deadweight and strong bearing capacity.

[0005] The invention also provides a construction method of the prestressed composite beam structure.

[0006] A prestressed composite beam structure according to an embodiment of the first aspect of the present invention comprises: A beam body, the beam body comprising a first plywood board, a second plywood board, and a plywood bamboo board, the first plywood board being arranged horizontally, the plywood bamboo board being arranged parallelly and spaced at a lower side of the first plywood board, the second plywood board being located between the first plywood board and the plywood bamboo board, and the second plywood board being vertically connected to the first plywood board and the plywood bamboo board respectively; An aluminum alloy outer frame, the aluminum alloy outer frame is coated on the outer periphery of the beam body, the aluminum alloy outer frame is respectively formed with mounting grooves on the outer sides of both ends of the beam body in the width direction, the mounting groove extends along the length direction of the beam body, a plurality of ribs are fixed in the mounting groove, the plurality of ribs are arranged at intervals along the length direction of the mounting groove, and both ends and the middle of the mounting groove in the length direction have the ribs; The prestressed stranded wire is passed through a plurality of the ribs, and both ends of the prestressed stranded wire are respectively fixed to the ribs at both ends of the length direction of the installation groove, and the position of the middle part of the length direction of the prestressed stranded wire is lower than the positions of the two ends of the prestressed stranded wire.

[0007] The prestressed composite beam structure according to the embodiment of the present invention has at least the following beneficial effects: By adopting the above-mentioned structural setting, the tension can be borne by the lower plywood bamboo board, and the pressure and shear force can be borne by the first plywood board and the second plywood board in the upper and middle parts, so as to make full use of the excellent tensile strength of bamboo, as well as the compression and bending resistance of wood, so that the overall structure can withstand a larger load and have a strong bearing capacity; secondly, by covering the outer side of the beam body with an aluminum alloy frame, the advantage of the strong corrosion resistance of aluminum alloy can be fully utilized to protect the inner beam body, avoid the beam body from being damp and rotten in the coastal high-salt and high-humidity environment, and improve the service life of the overall structure, and the aluminum alloy material has a light weight, which can reduce the weight of the overall structure; in addition, by passing the prestressed stranded wire through the rib plate, and making the middle part of the length direction of the prestressed stranded wire lower than the two ends of the prestressed stranded wire, on the one hand, The reaction force of the prestressed strands can pre-compress the prestressed composite beam structure before loading, so that the middle part of the length direction of the prestressed composite beam structure has an upward bending tendency. When the prestressed composite beam structure is loaded, the partial pressure transmitted from above is balanced with the reaction force of the prestressed strands, thereby effectively reducing the cross-sectional deformation of the prestressed composite beam structure and ensuring the short-term performance of the structure. On the other hand, the prestressed strands can also transfer the pressure in the middle part of the length direction of the prestressed composite beam structure to the ribs on both sides, and then transfer it from top to bottom to the glued bamboo board by the ribs, so as to achieve the effect of transferring the force in the middle part of the length direction of the prestressed composite beam structure to both sides, so that each component can bear the load together, each component is fully stressed, and the performance of each component is fully utilized to ensure the safety and stability of the prestressed composite beam structure.

[0008] According to some embodiments of the present invention, the prestressed stranded wire comprises a first section and a second section, wherein the first section and the second section are connected end to end to form a V-shaped structure.

[0009] According to some embodiments of the present invention, the angular bisectors of the first segment and the second segment are vertically distributed.

[0010] According to some embodiments of the present invention, the angle between the first section and the horizontal plane ranges from 10 degrees to 35 degrees, and the angle between the second section and the horizontal plane ranges from 10 degrees to 35 degrees.

[0011] According to some embodiments of the present invention, a protective sleeve is provided on the prestressed stranded wire, the protective sleeve is passed through a plurality of the ribs, and two ends of the protective sleeve are respectively connected to the ribs at two ends of the length direction of the installation groove.

[0012] According to some embodiments of the present invention, the upper and lower ends of the rib plate are respectively welded to the upper and lower side walls of the mounting groove, and the rib plate is provided with a through hole for the prestressed stranded wire to pass through, and the distance between the through hole and the bottom end of the rib plate is greater than or equal to 30 mm.

[0013] According to some embodiments of the present invention, the first plywood board, the second plywood board, and the plywood bamboo board are combined to form an H-shaped structure.

[0014] According to some embodiments of the present invention, the prestressed stranded wire is configured as one of a steel stranded wire, a copper stranded wire and an aluminum stranded wire.

[0015] The construction method of the prestressed composite beam structure according to the second embodiment of the present invention comprises the following steps: Making the beam body: making the first plywood board, the second plywood board and the plywood bamboo board, combining the first plywood board, the second plywood board and the plywood bamboo board by adhesive to form the H-shaped beam body, and pressurizing and maintaining for a set time; Making the aluminum alloy outer frame: making the aluminum alloy outer frame according to the size of the beam body, and reserving through holes on the ribs for the prestressed strands to pass through, wherein anchor pads are installed on the ribs at both ends of the mounting groove in the length direction; Assembling the beam body and the aluminum alloy outer frame: connecting the beam body and the aluminum alloy outer frame by using fasteners; Install the prestressed stranded wire: pass the prestressed stranded wire through the through hole, apply prestress to the prestressed stranded wire, and anchor the two ends of the prestressed stranded wire to the anchor pads at the two ends of the length direction of the installation groove through anchors.

[0016] According to some embodiments of the present invention, the step of making the beam body includes: making the glued bamboo board: soaking a number of rectangular bamboo strips in a NaOH solution for 10 minutes, the moisture content of the rectangular bamboo strips being 9% to 11%, the temperature of the NaOH solution being 80 degrees Celsius, and the concentration of the NaOH solution being 3%; then applying glue on each of the rectangular bamboo strips, and stacking the rectangular bamboo strips and placing them on a hot press for densification treatment, the pressing plate temperature of the hot press being 110 degrees Celsius to 160 degrees Celsius, the pressure being 5MPa to 6MPa, the compression time being 15 minutes, and the compression rate of the rectangular bamboo strips being 50%; finally cooling to room temperature.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 is an axial schematic diagram of a prestressed composite beam structure according to an embodiment of the present invention; Figure 2 is a schematic diagram of the installation structure of the prestressed stranded wire according to an embodiment of the present invention; Figure 3 is a front view of a prestressed composite beam structure according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the installation structure of the aluminum alloy outer frame and the beam body according to an embodiment of the present invention; Figure 5 is a structural schematic diagram of a beam body according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the exploded structure of the prestressed stranded wire and the rib plate installation according to an embodiment of the present invention.

[0019] Figure Number: The beam body 100, the first plywood board 110, the second plywood board 120, and the plywood bamboo board 130; Aluminum alloy outer frame 200, mounting groove 201, first U-shaped plate 202, second U-shaped plate 203, third U-shaped plate 204, fourth U-shaped plate 205, rib plate 210, through hole 211, anchor plate 220, anchor clip 230, anchor plate 240; Prestressed stranded wire 300 , first section 301 , second section 302 , and protective sheath 310 . DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] Reference Figures 1 to 6 As shown, a prestressed composite beam structure according to an embodiment of the present invention includes: a beam body 100, an aluminum alloy outer frame 200, and a prestressed stranded wire 300.

[0025] The beam body 100 includes a first plywood board 110, a second plywood board 120, and a plywood bamboo board 130. The first plywood board 110 is horizontally arranged, and the plywood bamboo board 130 is arranged parallel and spaced at the lower side of the first plywood board 110. The second plywood board 120 is located between the first plywood board 110 and the plywood bamboo board 130, and the second plywood board 120 is vertically connected to the first plywood board 110 and the plywood bamboo board 130, respectively. That is, the first plywood board 110 and the second plywood board 120, and the plywood bamboo boards 130 are distributed sequentially from top to bottom; specifically, the first plywood board 110, the second plywood board 120, and the plywood bamboo boards 130 have the same size, and the length directions of the three are consistent, and the three are combined to form an H-shaped structure, that is, the cross-section of the beam body 100 is H-shaped, and the H-shaped structure can save materials and provide higher strength; in addition, the first plywood board 110, the second plywood board 120, and the plywood bamboo boards 130 are bonded by adhesive.

[0026] The aluminum alloy outer frame 200 is coated on the outer periphery of the beam body 100 so that the beam body 100 is located inside the aluminum alloy outer frame 200. The aluminum alloy outer frame 200 is respectively formed with mounting grooves 201 on the outer sides of both ends of the beam body 100 in the width direction. The mounting grooves 201 extend along the length direction of the beam body 100. A plurality of ribs 210 are fixed in the mounting grooves 201. The plurality of ribs 210 are arranged at intervals along the length direction of the mounting grooves 201, and both ends and the middle of the length direction of the mounting grooves 201 have ribs 210. By providing the ribs 210, the strength of the overall structure can be improved. Obviously, the mounting grooves 201 on both sides are provided with ribs 210. It can be imagined that the aluminum alloy outer frame 200 can be connected to the beam body 100 by fasteners such as bolts and self-tapping screws.

[0027] The prestressed strands 300 are passed through a plurality of ribs 210, and holes are provided on the ribs 210 for the prestressed strands 300 to pass through. The two ends of the prestressed strands 300 are respectively fixed on the ribs 210 at the two ends of the length direction of the installation groove 201, and the position of the middle part of the length direction of the prestressed strands 300 is lower than the positions of the two ends of the prestressed strands 300. It should be noted that when installing the prestressed strands 300, it is necessary to apply prestress to the prestressed strands 300. In this way, since the position of the middle part of the length direction of the prestressed strands 300 is lower than the positions of the two ends of the prestressed strands 300, the reaction force of the prestressed strands 300 pre-tensioning can make the prestressed composite beam structure pre-pressed before loading, so that the middle part of the length direction of the prestressed composite beam structure has an upward bending tendency. When the prestressed composite beam structure is loaded, the partial pressure transmitted from above is balanced with the reaction force of the prestressed strands 300 pre-tensioning, so that it can withstand a greater pressure transmitted from above and improve the bearing capacity. Obviously, the installation grooves 201 on both sides are provided with corresponding prestressed strands 300 to ensure the balance of force. It can be imagined that the prestressed strands 300 can be one of steel strands, copper strands and aluminum strands. In this embodiment, the prestressed strands 300 are set as steel strands, which are formed by twisting multiple high-strength steel wires, have high tensile strength, and can withstand large external forces.

[0028] It is understandable that when the beam is subjected to load, the first part to crack is the lower part of the beam, and the middle and upper parts of the beam are mainly subjected to pressure and shear force. The prestressed composite beam structure using the above-mentioned structure can withstand tension through the lower glued bamboo board 130, and withstand pressure and shear force through the first glued wood board 110 and the second glued wood board 120 in the middle and upper parts, making full use of the excellent tensile strength of bamboo, as well as the compression and bending resistance of wood, so that the overall structure can withstand a larger load and has a strong bearing capacity; secondly, by covering the outer side of the beam body 100 with an aluminum alloy outer frame 200, the advantage of the strong corrosion resistance of aluminum alloy can be fully utilized to protect the inner beam body 100, prevent the beam body 100 from being damp and rotten in the coastal high-salt and high-humidity environment, and improve the service life of the overall structure. The aluminum alloy material has a light weight, which can reduce the weight of the overall structure; in addition, by passing the prestressed strands 300 through the ribs 210, and making the prestressed strands 3 00 is located in the middle of the length direction lower than the positions of the two ends of the prestressed strand 300. On the one hand, the reaction force of the prestressed strand 300 pre-tensioning can pre-compress the prestressed composite beam structure before loading, so that the middle of the length direction of the prestressed composite beam structure has an upward bending tendency. When the prestressed composite beam structure is loaded, part of the pressure transmitted from above is balanced with the reaction force of the prestressed strand 300 pre-tensioning, thereby effectively reducing the cross-sectional deformation of the prestressed composite beam structure and ensuring the short-term performance of the structure. On the other hand, the prestressed strand 300 can also transfer the pressure in the middle of the length direction of the prestressed composite beam structure to the ribs 210 on both sides, and then transfer it from top to bottom to the glued bamboo board 130 by the ribs 210, so as to achieve the effect of transferring the force in the middle of the length direction of the prestressed composite beam structure to both sides, so that each component bears the load together, each component is fully stressed, and the performance of each component is fully utilized to ensure the safety and stability of the prestressed composite beam structure.

[0029] In some specific embodiments, the aluminum alloy outer frame 200 includes a first U-shaped plate 202, a second U-shaped plate 203, a third U-shaped plate 204, and a fourth U-shaped plate 205. The first U-shaped plate 202 is covered on the upper side of the first plywood board 110 and is connected to the first plywood board 110 through fasteners. The second U-shaped plate 203 is covered on the lower side of the plywood bamboo board 130 and is connected to the plywood bamboo board 130 through fasteners. The third U-shaped plate 204 and the fourth U-shaped plate 205 are respectively located at both ends of the second plywood board 120 in the thickness direction and are symmetrically distributed about the second plywood board 120. The third U-shaped plate 204 and the fourth U-shaped plate 205 are fastened together. The third U-shaped plate 204 and the fourth U-shaped plate 205 are connected to the second plywood board 120, and the third U-shaped plate 204 and the fourth U-shaped plate 205 are formed with mounting grooves 201 on the opposite sides. The first U-shaped plate 202, the second U-shaped plate 203, the third U-shaped plate 204, and the fourth U-shaped plate 205 are enclosed to form an H-shaped closed cavity adapted to the beam body 100 to wrap the beam body 100. The gaps between the first U-shaped plate 202, the second U-shaped plate 203, the third U-shaped plate 204, and the fourth U-shaped plate 205 are welded to connect the first U-shaped plate 202, the second U-shaped plate 203, the third U-shaped plate 204, and the fourth U-shaped plate 205 into a whole to improve the structural stability. It can be understood that the rib plate 210 can be welded to the third U-shaped plate 204 or the fourth U-shaped plate 205, and the rib plate 210 can also be cast and formed integrally with the third U-shaped plate 204 or the fourth U-shaped plate 205.

[0030] Reference Figure 1 and Figure 2 As shown, in some embodiments, the prestressed strand 300 includes a first section 301 and a second section 302, the first section 301 and the second section 302 are connected end to end to form a V-shaped structure, and the two ends of the first section 301 and the second section 302 that are far away from each other are respectively connected to two ribs 210 at both ends of the length direction of the installation groove 201; of course, the first section 301 and the second section 302 can also form a parabolic structure together. Generally speaking, the bending moment diagram of the beam after bearing is a parabola, so it is more in line with mechanical requirements to set the prestressed strand 300 to a parabola. The advantage of using a V-shaped structure over a parabolic structure is that, on the one hand, it is convenient to process holes on the rib 210 for the prestressed strand 300 to pass through, and on the other hand, the contact surface between the prestressed strand 300 of the V-shaped structure and the rib 210 will be more regular, which can avoid the problem of stress concentration on the rib 210.

[0031] Reference Figure 1 and Figure 2As shown, it can be understood that a plurality of ribs 210 are evenly spaced apart along the length direction of the mounting groove 201, and a rib 210 is provided at the midpoint position in the length direction of the mounting groove 201, and the lowest point of the prestressed strand 300 is located at this rib 210. Since the middle position in the length direction of the beam is the position subject to the greatest force when the beam is loaded, the present embodiment provides a rib 210 at the midpoint position in the length direction of the mounting groove 201 to provide greater supporting force, and arranging the ribs 210 evenly spaced apart can improve the balance of force.

[0032] Reference Figure 2 As shown, in some embodiments, the angular bisectors of the first section 301 and the second section 302 are vertically distributed, that is, the first section 301 and the second section 302 are symmetrically distributed. With this arrangement, the prestressed strands 300 can evenly transfer force to each rib 210, so that the force at each position in the length direction of the prestressed composite beam structure is more balanced.

[0033] Reference Figure 1 and Figure 2 As shown, in some embodiments, the angle between the first section 301 and the horizontal plane ranges from 10 degrees to 35 degrees, and the angle between the second section 302 and the horizontal plane ranges from 10 degrees to 35 degrees. If the overall length of the beam is relatively long, a too small angle will affect the force transmission effect of the prestressed strands 300, and if the overall length of the beam is relatively short, a too large angle will generate a large torque on the rib 210. Therefore, in this embodiment, the angle between the first section 301 and the horizontal plane ranges from 10 degrees to 35 degrees, and the angle between the second section 302 and the horizontal plane ranges from 10 degrees to 35 degrees.

[0034] Reference Figure 1 and Figure 2 As shown, in some embodiments, a protective cover 310 is provided on the prestressed strand 300, and the protective cover 310 is passed through a plurality of ribs 210, and the two ends of the protective cover 310 are respectively connected to the ribs 210 at the two ends of the length direction of the installation slot 201, and the protective cover 310 is provided to protect the prestressed strand 300 and prevent it from being damaged by corrosion. Specifically, the prestressed strand 300 is set as a steel strand, and anchor plates 220 are installed on the ribs 210 at the two ends of the length direction of the installation slot 201, and the two ends of the prestressed strand 300 are respectively anchored to the corresponding anchor plates 220 through anchors. In addition, in order to ensure the structural stability of the protective cover 310, the two ends of the protective cover 310 are respectively glued to the anchor plates 220 on the ribs 210 at the two ends of the length direction of the installation slot 201, wherein the anchor includes an anchor clip 230 and an anchor plate 240.

[0035] Reference Figure 1 and Figure 4As shown, in some embodiments, the upper and lower ends of the rib plate 210 are respectively welded to the upper and lower side walls of the mounting groove 201, and the rib plate 210 is provided with a through hole 211 for the prestressed stranded wire 300 to pass through, and the distance between the through hole 211 and the bottom end of the rib plate 210 is greater than or equal to 30 mm, so that the prestressed stranded wire 300 can be prevented from being too close to the bottom of the rib plate 210 when applying force to the rib plate 210, and uneven force on the weld can be avoided. It is obvious that the prestressed stranded wire 300 is located in the protective cover 310, and the protective cover 310 passes through multiple rib plates 210, and the through hole 211 on the rib plate 210 is adapted to the protective cover 310. In this embodiment, the third U-shaped plate 204 and the fourth U-shaped plate 205 are both formed with a mounting groove 201, the third U-shaped plate 204 is welded to the corresponding rib plate 210, and the fourth U-shaped plate 205 is welded to the corresponding rib plate 210.

[0036] In one specific embodiment, the first plywood board 110, the second plywood board 120, and the plywood bamboo board 130 are boards of the same size, and the length, width, and thickness of the three are 2000 mm, 300 mm, and 50 mm, respectively. The three are connected to form an H-shaped beam body 100 by a structural adhesive and are pressurized for maintenance for three days; the first U-shaped board 202 and the second U-shaped board 203 have the same size, and the length, height, leg width, and thickness of the two are 2000 mm, 320 mm, 70 mm, and 10 mm, respectively. Bolt holes are set on the first U-shaped board 202 and the second U-shaped board 203; the third U-shaped board 204 and the fourth U-shaped board 205 The sizes of the two are the same, and the length, height, leg width and thickness of the two are 2000mm, 300mm, 125mm and 10mm respectively. Bolt holes are provided on the third U-shaped plate 204 and the fourth U-shaped plate 205; wherein the first U-shaped plate 202, the second U-shaped plate 203, the third U-shaped plate 204 and the fourth U-shaped plate 205 are connected to the beam body 100 formed by the combination of the first plywood board 110, the second plywood board 120 and the plywood bamboo board 130 respectively by bolts and self-tapping screws; the length, width and thickness of the rib plate 210 are 280mm, 125mm and 50mm respectively, and the spacing between adjacent rib plates 210 is 400mm.

[0037] The present invention also proposes a construction method based on the above-mentioned prestressed composite beam structure, and the construction method comprises the following steps: Step 1: Making the beam body 100: Making a first plywood board 110, a second plywood board 120 and a plywood bamboo board 130, combining the first plywood board 110, the second plywood board 120 and the plywood bamboo board 130 by an adhesive to form an H-shaped beam body 100, and pressurizing and maintaining for a set time; wherein the first plywood board 110, the second plywood board 120 and the plywood bamboo board 130 are boards of the same size, and the set time for pressurizing and maintaining is three days; when making the first plywood board 110 and the second plywood board 120, an anti-corrosion coating treatment is required; the steps for making the plywood bamboo board 130 are as follows: First, a plurality of rectangular bamboo strips are soaked in a NaOH solution for 10 minutes, wherein the moisture content of the rectangular bamboo strips is 9% to 11%, the temperature of the NaOH solution is 80 degrees Celsius, and the concentration of the NaOH solution is 3%; then, glue is applied to each rectangular bamboo strip, and the rectangular bamboo strips are stacked and placed on a hot press for densification treatment, wherein the pressing plate temperature of the hot press is 110 degrees Celsius to 160 degrees Celsius, the pressure is 5MPa to 6MPa, the compression time is 15 minutes, and the compression rate of the pressing plate on the rectangular bamboo strips is 50%; finally, the strips are cooled to room temperature to obtain a glued bamboo board 130 having strong corrosion resistance, light weight, and high strength; Step 2: Making an aluminum alloy outer frame 200: Making an aluminum alloy outer frame 200 according to the size of the beam body 100, and reserving a through hole 211 on the rib plate 210 for the prestressed stranded wire 300 to pass through, wherein anchor pads 220 are installed on the rib plates 210 at both ends of the length direction of the mounting groove 201, and the anchor pads 220 can be installed on the rib plates 210 by bolts; specifically, the aluminum alloy outer frame 200 includes a first U-shaped plate 202, a second U-shaped plate 203, a third U-shaped plate 204, and a fourth U-shaped plate 205, and the four U-shaped plates are made separately, wherein the above-mentioned mounting groove 201 is formed on the third U-shaped plate 204 and the fourth U-shaped plate 205 and the rib plate 210 is set, the rib plate 210 can be welded to the third U-shaped plate 204 or the fourth U-shaped plate 205 into one body, and the rib plate 210 can also be integrally cast with the third U-shaped plate 204 or the fourth U-shaped plate 205; Step 3: Assemble the beam body 100 and the aluminum alloy outer frame 200: Use fasteners to connect the beam body 100 and the aluminum alloy outer frame 200. The fasteners can be a combination of bolts and self-tapping screws. Specifically, during assembly, the first U-shaped plate 202 is covered on the upper side of the first plywood board 110 and connected to the first plywood board 110 through fasteners, the second U-shaped plate 203 is covered on the lower side of the plywood bamboo board 130 and connected to the plywood bamboo board 130 through fasteners, the third U-shaped plate 204 and the fourth U-shaped plate 205 are respectively attached to the two ends of the second plywood board 120 in the thickness direction and the two are symmetrically distributed about the second plywood board 120, and the third U-shaped plate 204 and the fourth U-shaped plate 205 are connected to the second plywood board 120 through fasteners; Obviously, each component can be prefabricated and installed, and is less affected by seasonal factors, so the construction time can be shortened and the construction efficiency can be effectively improved; Step 4: Install the prestressed stranded wire 300: Pass the prestressed stranded wire 300 through the through hole 211, apply prestress to the prestressed stranded wire 300, and anchor the two ends of the prestressed stranded wire 300 to the anchor plates 220 at both ends of the length direction of the installation groove 201 through anchors. Specifically, the prestressed stranded wire 300 is also covered with a protective cover 310. When installing the prestressed stranded wire 300, first pass the prestressed stranded wire 300 through the protective cover 310, and then pass the two together through the through hole 211 reserved on the rib plate 210, and connect the two ends of the protective cover 310 to the anchor plates 220 on the corresponding sides through adhesives, apply prestress, and anchor the two ends of the prestressed stranded wire 300 to the anchor plates 220 at both ends of the length direction of the installation groove 201 through the anchor plates 240 and the anchor clips 230.

[0038] Through the above steps, a prestressed composite beam structure with light weight, large bearing capacity and applicable to coastal high-salt and high-humidity environment can be obtained.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0040] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A prestressed composite beam structure, characterized in that: include: A beam body, the beam body comprising a first plywood board, a second plywood board, and a plywood bamboo board, the first plywood board being arranged horizontally, the plywood bamboo board being arranged parallelly and spaced at a lower side of the first plywood board, the second plywood board being located between the first plywood board and the plywood bamboo board, and the second plywood board being vertically connected to the first plywood board and the plywood bamboo board respectively; An aluminum alloy outer frame, the aluminum alloy outer frame is coated on the outer periphery of the beam body, the aluminum alloy outer frame is respectively formed with mounting grooves on the outer sides of both ends of the beam body in the width direction, the mounting groove extends along the length direction of the beam body, a plurality of ribs are fixed in the mounting groove, the plurality of ribs are arranged at intervals along the length direction of the mounting groove, and both ends and the middle of the mounting groove in the length direction have the ribs; The prestressed stranded wire is passed through a plurality of the ribs, and both ends of the prestressed stranded wire are respectively fixed to the ribs at both ends of the length direction of the installation groove, and the position of the middle part of the length direction of the prestressed stranded wire is lower than the positions of the two ends of the prestressed stranded wire.

2. The prestressed composite beam structure according to claim 1, characterized in that: The prestressed stranded wire comprises a first section and a second section, wherein the first section and the second section are connected end to end to form a V-shaped structure.

3. The prestressed composite beam structure according to claim 2, characterized in that: The angular bisectors of the first section and the second section are vertically distributed.

4. The prestressed composite beam structure according to claim 2, characterized in that: The numerical range of the angle between the first section and the horizontal plane is 10 degrees to 35 degrees, and the numerical range of the angle between the second section and the horizontal plane is 10 degrees to 35 degrees.

5. The prestressed composite beam structure according to claim 1, characterized in that: The prestressed stranded wire is covered with a protective sleeve, the protective sleeve is passed through a plurality of the ribs, and two ends of the protective sleeve are respectively connected to the ribs at two ends of the length direction of the installation groove.

6. The prestressed composite beam structure according to claim 1, characterized in that: The upper and lower ends of the rib plate are respectively welded to the upper and lower side walls of the mounting groove. The rib plate is provided with a through hole for the prestressed stranded wire to pass through. The distance between the through hole and the bottom end of the rib plate is greater than or equal to 30 mm.

7. The prestressed composite beam structure according to claim 1, characterized in that: The first plywood board, the second plywood board and the plywood bamboo board are combined to form an H-shaped structure.

8. The prestressed composite beam structure according to claim 1, characterized in that: The prestressed stranded wire is configured as one of a steel stranded wire, a copper stranded wire and an aluminum stranded wire.

9. A construction method of a prestressed composite beam structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: Making the beam body: making the first plywood board, the second plywood board and the plywood bamboo board, combining the first plywood board, the second plywood board and the plywood bamboo board by adhesive to form the H-shaped beam body, and pressurizing and maintaining for a set time; Making the aluminum alloy outer frame: making the aluminum alloy outer frame according to the size of the beam body, and reserving through holes on the ribs for the prestressed strands to pass through, wherein anchor pads are installed on the ribs at both ends of the mounting groove in the length direction; Assembling the beam body and the aluminum alloy outer frame: connecting the beam body and the aluminum alloy outer frame by using fasteners; Install the prestressed stranded wire: pass the prestressed stranded wire through the through hole, apply prestress to the prestressed stranded wire, and anchor the two ends of the prestressed stranded wire to the anchor pads at the two ends of the length direction of the installation groove through anchors.

10. The construction method according to claim 9, characterized in that: The steps of making the beam body include: making the glued bamboo board: soaking a number of rectangular bamboo strips in a NaOH solution for 10 minutes, wherein the moisture content of the rectangular bamboo strips is 9% to 11%, the temperature of the NaOH solution is 80 degrees Celsius, and the concentration of the NaOH solution is 3%; then applying glue on each of the rectangular bamboo strips, and stacking the rectangular bamboo strips and placing them on a hot press for densification treatment, wherein the pressing plate temperature of the hot press is 110 degrees Celsius to 160 degrees Celsius, the pressure is 5MPa to 6MPa, the compression time is 15 minutes, and the compression rate of the rectangular bamboo strips is 50%; finally cooling to room temperature.

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