Concrete floor slab prestressed fiber cloth reinforcing device and method
By using a prestressed fiber cloth reinforcement device on the concrete floor, the fiber belt actively participates in the stress before the secondary stress deformation of the concrete floor slab, solving the problems of passive reinforcement and stress hysteresis in the existing reinforcement methods, significantly improving the bending stiffness and bearing capacity of the floor slabs, and reducing construction difficulty and cost.
Patent Information
- Application Number
- CN202510098153.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-03-14
AI Technical Summary
The existing reinforced reinforcement methods for reinforced concrete floors have problems such as passive reinforcement, stress lag, long construction cycle and high cost.
The prestressed fiber cloth reinforcement device for concrete floor slabs is adopted. Through the combination of fiber belts and tension anchoring mechanisms, the fiber belts actively participate in the stress before the secondary stress deformation of the concrete floor slabs to avoid secondary disturbances to the concrete floor slabs.
The fiber belt actively participates in the stress on the concrete floor slab, improves the bending stiffness and bearing capacity of the floor slab, and has a significant reinforcement effect, while shortening the construction period and reducing the reinforcement cost.
Smart Images
Figure CN119616260A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to building structure reinforcement, and in particular to a concrete floor slab prestressed fiber cloth reinforcement device and method. Background Art
[0002] There are many existing reinforced concrete houses. Some of them have suffered varying degrees of damage to their floors due to poor construction quality, changes in usage functions, material aging, environmental erosion, disaster damage, etc., and no longer meet the requirements for normal and safe use. They are in urgent need of repair and reinforcement.
[0003] At present, the reinforcement of reinforced concrete floor slabs mainly includes the reinforcement method of increasing the cross-section, the reinforcement method of gluing steel plates, and the reinforcement method of gluing fiber cloth. All of the above reinforcement methods can play a reinforcement effect and can effectively extend the service life. However: 1) The above reinforcement methods are all passive reinforcement. The reinforcement materials will only begin to participate in the stress after the reinforced concrete slab is continuously subjected to stress and deformation. There is a certain lag in the stress of the reinforcement materials, resulting in limited improvement in the bearing capacity of the reinforced concrete floor slab after reinforcement; 2) The above reinforcement methods all require drilling holes, planting reinforcement bars, roughening the slab surface, etc. on the original concrete floor slab, which not only causes secondary disturbance to the original concrete floor slab, but also has a long construction period and high reinforcement cost. Summary of the invention
[0004] The purpose of the present invention is to provide a prestressed fiber cloth reinforcement device for concrete slabs, and a prestressed fiber cloth reinforcement method for concrete slabs based on the above device, wherein the fiber belt actively participates in the stress before the concrete slab is subjected to secondary stress and deformation, thereby avoiding secondary disturbance to the concrete slab.
[0005] The technical solution adopted by the present invention is: A prestressed fiber cloth reinforcement device for concrete floor, comprising a fiber belt and a tensioning and anchoring mechanism; the fiber belt is parallel to the concrete floor, and is formed by an even number of layers of fiber cloth that are fully impregnated and cured by impregnating resin; the tensioning and anchoring mechanism is used to tension and anchor the two ends of the fiber belt to the upper ends of the supporting beams on both sides below the concrete floor, respectively; the tensioning and anchoring mechanism comprises a wedge, an anchor box and a tensioning screw assembly, the end of the fiber belt is divided into two parts in half according to the number of layers, the narrow end of the wedge is inserted between the two parts, the fiber cloths of the two parts are staggered around the wide end of the wedge, the anchor box is longitudinally provided with a wedge-shaped through seam, the through seam matches the wedge-shaped surface of the wedge, the end of the fiber belt is tightly stuck in the through seam with the wedge, the tensioning screw assemblies are distributed on both sides of the fiber belt in the horizontal direction, the tensioning screw assemblies are simultaneously tensioned and installed on the anchor box and the supporting beam, and the prestressed tensioning and anchoring of the fiber cloth are achieved by adjusting the tensioning force of the tensioning screw assembly.
[0006] Preferably, the fiber band and the tensioning and anchoring mechanisms at both ends of the fiber band are distributed along the support beam.
[0007] Preferably, the fiber tape is made of unidirectional high-performance fiber cloth.
[0008] Preferably, the wedge block adopts a symmetrical structure in the upper and lower directions, with equal cross-sections in the width direction and a wedge-shaped cross-section in the length direction with a gradient of less than 1 / 10. The width of the wedge block is greater than the width of the fiber cloth, and the ratio of length to width is not less than 1 / 2. Both ends of the wedge block in the length direction are rounded, and the thickness of the narrow end of the wedge block is not less than 5 mm. The outer surface of the wedge block is ground and polished at the contact position with the fiber cloth.
[0009] Preferably, the anchor box is rectangular in shape, the through seam is located at the center of the anchor box in the transverse and thickness directions, there are gaps between the upper and lower sides and the left and right sides of the wedge block and the through seam, and through holes for passing the tension screw assembly are provided on both sides of the anchor box in the transverse direction. The through holes are located at the center of the anchor box in the thickness direction and are symmetrical about the transverse center of the anchor box.
[0010] Preferably, the length of the through slot and the anchor box is equal to the length of the wedge, the width of the anchor box is four times greater than the width of the wedge by the diameter of the tension screw assembly, and the thickness of the anchor box is twice the maximum thickness of the wedge.
[0011] Preferably, the diameter of the through hole on the anchor box is larger than the diameter of the tension screw assembly, and the support beam is provided with a through-beam hole for passing the tension screw assembly, and the diameter of the through-beam hole is larger than the diameter of the tension screw assembly.
[0012] Preferably, the tensioning screw assembly includes a high-strength screw, a nut and a pad. The high-strength screw passes through the anchor box and the support beam at the same time. The nut is fitted on the high-strength screw and one nut is pressed against the anchor box and the other nut is pressed against the support beam through the pad. The tensioning screw assemblies on both sides of the same end of the fiber belt share the pad.
[0013] Preferably, the ultimate tensile strength of the tensioning screw assembly is determined by the ultimate tensile strength of the fiber band, and the sum of the ultimate tensile strengths of the tensioning screw assemblies on both lateral sides of the same end of the fiber band matches the ultimate tensile strength of the fiber band.
[0014] A method for reinforcing a concrete slab with prestressed fiber cloth is based on the above-mentioned concrete slab prestressed fiber cloth reinforcing device: first, holes are drilled at the distribution positions of the tension screw assembly on the support beam, and then the tension screw assembly is simultaneously passed through the anchor box and the support beam; then the fiber belt is installed: the single-layer fiber cloth is fully impregnated with impregnation resin and then assembled into a fiber belt according to the designed even number of layers, before the impregnation resin is cured, the end of the fiber belt is passed through the through seam, and then the end of the fiber belt is divided into two parts in half according to the number of layers, the narrow end of the wedge is inserted between the two parts, and then the fiber cloth of the two parts is staggered around the wide end of the wedge, and then the fiber belt is pulled back so that the end of the fiber belt is tightly stuck in the through seam with the wedge Then the fiber belt is pre-tensioned and formed: after the two ends of the fiber belt are tightly stuck in the through-slits of the tensioning and anchoring mechanisms at both ends, the nuts in the tensioning screw assembly are synchronously operated at both ends of the fiber belt, and the fiber belt is pre-tensioned from both ends by adjusting the tensioning force of the tensioning screw assembly, and it is solidified and formed in the pre-tensioned state; then prestressed tensioning and anchoring: the prestress to be applied to the fiber belt is converted into the pre-tensioning force of the tensioning screw assembly and the torque of the nut under the corresponding pre-tensioning force, the nuts in the tensioning screw assembly are operated synchronously at both ends of the fiber belt or one end is operated separately, and the nuts are stopped tightening after the tightening torque reaches the corresponding torque, thus completing the prestressing and anchoring of the fiber belt.
[0015] The beneficial effects of the present invention are: The cooperation of the wedge block, the anchor box and the end of the fiber belt can anchor the end of the fiber belt in the anchor box. The two ends of the fiber belt are tightened by the anchor box, and the anchor box is tightened by the tension screw assembly in cooperation with the support beam. Therefore, the fiber belt can realize prestressing under the action of the tensioning and anchoring mechanism, so that the fiber belt actively participates in the stress before the concrete floor is subjected to secondary stress and deformation. While giving full play to the high-strength characteristics of the fiber belt, the bending stiffness and bearing capacity of the concrete floor are further improved, and the reinforcement effect is significant. The device uses wedge blocks, anchor boxes and tension screw assemblies to tension and anchor the fiber belt on the support beam. There is no need to perform construction operations on the concrete floor, which avoids secondary disturbances to the concrete floor. Moreover, during installation, only holes need to be drilled on the support beam, which effectively reduces the difficulty of reinforcement construction, shortens the construction period, and reduces reinforcement costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a top view of the concrete floor prestressed fiber cloth reinforcement device after installation.
[0017] Figure 2 It is a forward section view of the concrete floor slab prestressed fiber cloth reinforcement device after installation.
[0018] Figure 3 It is a schematic diagram of the installation of the fiber belt end, wedge block and anchor box.
[0019] Figure 4 It is a schematic diagram of the installation of the fiber belt end and the wedge.
[0020] Figure 5 Schematic diagram of the anchor box, where a) is the front view, b) is the top view, and c) is the back view.
[0021] In the figure: 1-concrete floor; 2-fiber belt; 3-tension anchoring mechanism; 31-anchor box; 311-through seam; 312-through hole; 32-wedge block; 33-tension screw assembly; 331-nut; 332-high-strength screw; 333-pad; 4-support beam. DETAILED DESCRIPTION
[0022] The present application is further described below in conjunction with the accompanying drawings and embodiments.
[0023] Embodiment 1 This embodiment discloses a concrete floor prestressed fiber cloth reinforcement device, such as Figure 1 and Figure 2 As shown, it includes a fiber belt 2 and a tensioning anchoring mechanism 3; the fiber belt 2 is parallel to the concrete floor 1, and the fiber belt 2 is made of an even number of layers of fiber cloth that are fully impregnated and cured by impregnation resin. Figure 1 and Figure 2 The tensioning and anchoring mechanism 3 is used to tension and anchor the two ends of the fiber belt 2 to the upper ends of the supporting beams 4 on both sides below the concrete floor 1. The tensioning and anchoring mechanism 3 includes a wedge 32, an anchor box 31 and a tensioning screw assembly 33. The end of the fiber belt 2 is divided into two parts in half according to the number of layers. The narrow end of the wedge 32 is inserted between the two parts. The fiber cloths of the two parts are staggered around the wide end of the wedge 32. The anchor box 31 is longitudinally provided with a wedge-shaped through seam 311. The through seam 311 matches the wedge-shaped surface of the wedge 32. The end of the fiber belt 2 is tightly stuck in the through seam 311 with the wedge 32. The tensioning screw assembly 33 is distributed on both sides of the fiber belt 2 in the horizontal direction. The tensioning screw assembly 33 is simultaneously tensioned and installed on the anchor box 31 and the supporting beam 4. The prestressed tensioning and anchoring of the fiber cloth are achieved by adjusting the tensioning force of the tensioning screw assembly 33. Figures 1 to 4 .
[0024] like Figure 1 As shown, the fiber belt 2 and the tensioning and anchoring mechanisms 3 at both ends of the fiber belt 2 are distributed along the support beam 4 , and the specific number is determined according to the length of the support beam 4 and the reinforcement requirements of the concrete floor 1 .
[0025] In this embodiment, the fiber belt 2 adopts unidirectional high-performance fiber cloth, such as carbon fiber cloth, glass fiber cloth, aramid cloth and basalt fiber cloth used in the field of building structure reinforcement. The single-layer fiber cloth is commonly used in size of 50mm or 100mm wide and 0.167mm thick. The impregnating resin used can penetrate the fiber cloth and bond multiple layers of fiber cloth into a whole.
[0026] In this embodiment, the wedge block 32 adopts a symmetrical structure in the upper and lower directions, with equal cross-sections in the width direction and a wedge-shaped cross-section in the length direction with a gradient of less than 1 / 10. The width of the wedge block 32 is greater than the width of the fiber cloth (for example, 10 mm greater), the ratio of length to width is not less than 1 / 2, both ends of the wedge block 32 in the length direction are rounded (the size of the rounded corners is determined according to the thickness of the steel plate at the location), the thickness of the narrow end of the wedge block 32 is not less than 5 mm, and the outer surface of the wedge block 32 is ground and polished at the contact position with the fiber cloth.
[0027] In this embodiment, if Figure 5 As shown, the anchor box 31 is rectangular in shape, and the through-slit 311 is located at the center of the anchor box 31 in the transverse and thickness directions. There are gaps (e.g., 2 mm, which can be filled in or taken out by the wedge block 32) between the upper and lower sides and the left and right sides of the wedge block 32 and the through-slit 311. Through holes 312 for passing the tension screw assembly 33 are provided on both sides of the anchor box 31 in the transverse direction. The through holes 312 are located at the center of the anchor box 31 in the thickness direction and are symmetrical about the transverse center of the anchor box 31.
[0028] In this embodiment, the length of the through-slit 311 and the anchor box 31 is equal to the length of the wedge block 32, the width of the anchor box 31 is four times the diameter of the tension screw assembly 33 than the width of the wedge block 32, and the thickness of the anchor box 31 is twice the maximum thickness of the wedge block 32.
[0029] In this embodiment, the diameter of the through hole 312 on the anchor box 31 is larger than the diameter of the tension screw assembly 33 (e.g., 4 mm larger), and the support beam 4 is provided with a through-beam hole for passing the tension screw assembly 33, and the diameter of the through-beam hole is larger than the diameter of the tension screw assembly 33 (e.g., 4~6 mm larger).
[0030] In this embodiment, if Figure 1 and Figure 2 As shown, the tension screw assembly 33 includes a high-strength screw 332, a nut 331 and a pad 333. The high-strength screw 332 passes through the anchor box 31 and the support beam 4 at the same time. The nut 331 is matched with the high-strength screw 332, and the nut 331 is pressed on the anchor box 31 at one place, and the nut 331 is pressed on the support beam 4 through the pad 333 at another place. The tension screw assemblies 33 on both sides of the same end of the fiber belt 2 share the pad 333. In this embodiment, the thickness of the pad 333 is not less than 1 / 2 of the diameter of the high-strength screw 332, and the plane size of the pad 333 is determined according to the diameter and spacing of the high-strength screw 332.
[0031] In this embodiment, the ultimate tensile strength of the tension screw assembly 33 is determined by the ultimate tensile strength of the fiber belt 2, and the sum of the ultimate tensile strengths of the tension screw assemblies 33 on both sides of the same end of the fiber belt 2 matches the ultimate tensile strength of the fiber belt 2. The ultimate tensile strength of the fiber belt 2 is related to the material selection, number of layers, and width of the fiber cloth, and the ultimate tensile strength of the tension screw assembly 33 is related to the strength grade and diameter of the selected steel material.
[0032] Embodiment 2 This embodiment discloses a method for reinforcing a concrete slab with prestressed fiber cloth, based on the above-mentioned concrete slab prestressed fiber cloth reinforcing device, comprising the steps of: S1. Cutting the fiber cloth: Cut the fiber cloth according to the span of the concrete slab to be reinforced and the width and number of layers of the fiber cloth.
[0033] S2. Drilling holes on beams: Drill holes at corresponding positions on the upper ends of the support beams 4 on both sides below the concrete floor 1 according to the distribution and size of the tension screw assembly 33. The drilling positions should avoid the longitudinal reinforcement and stirrups in the support beams 4. Clean the holes after drilling.
[0034] S3, installing the tensioning anchor mechanism 3: passing the tensioning screw assembly 33 through the anchor box 31 and the support beam 4 at the same time, and temporarily installing it using the nut 331 of the tensioning screw assembly 33.
[0035] S4. Install the fiber belt 2: After the single-layer fiber cloth is fully impregnated with impregnating resin, assemble it into a fiber belt 2 according to the designed even number of layers. Before the impregnating resin is cured, pass the end of the fiber belt 2 through the through-slit 311, and then divide the end of the fiber belt 2 into two parts in half according to the number of layers, insert the narrow end of the wedge block 32 between the two parts, and then stagger the fiber cloth of the two parts around the wide end of the wedge block 32, and then pull the fiber belt 2 backward so that the end of the fiber belt 2 is tightly stuck in the through-slit 311 with the wedge block 32.
[0036] S5. Pre-tensioning and forming of the fiber belt 2: After the two ends of the fiber belt 2 are tightly clamped in the through-slits 311 of the tensioning and anchoring mechanisms 3 at both ends, the nuts 331 on the support beam 4 side of the tensioning screw assembly 33 are synchronously operated at both ends of the fiber belt 2. By adjusting the tensioning force applied by the tensioning screw assembly 33 to the anchor box 31, the fiber belt 2 is pre-tensioned from both ends simultaneously and solidified and formed in the pre-tensioned state.
[0037] S6. Prestressed tensioning and anchoring: convert the prestress to be applied to the fiber belt 2 into the prestress of the tensioning screw assembly 33 and the torque of the nut 331 under the corresponding prestress, operate the nut 331 on the support beam 4 side of the tensioning screw assembly 33 simultaneously at both ends of the fiber belt 2 or operate one end separately, and stop tightening the nut 331 (using a digital torque wrench) after the tightening torque reaches the corresponding torque, thus completing the prestressed tensioning and anchoring of the fiber belt 2.
[0038] In the present application, the cooperation of the wedge block 32, the anchor box 31 and the end of the fiber belt 2 can anchor the end of the fiber belt 2 in the anchor box 31, and the two ends of the fiber belt 2 are tightened by the anchor box 31, and the anchor box 31 is tightened by the tension screw assembly 33 in cooperation with the support beam 4. Therefore, the fiber belt 2 can realize prestressed tensioning under the action of the tensioning and anchoring mechanism 3, so that the fiber belt 2 actively participates in the stress before the concrete floor 1 is subjected to secondary stress and deformation. While giving full play to the high-strength characteristics of the fiber belt 2, the bending stiffness and bearing capacity of the concrete floor 1 are further improved, and the reinforcement effect is significant; the device uses the wedge block 32, the anchor box 31 and the tension screw assembly 33 to tension and anchor the fiber belt 2 on the support beam 4, without the need to perform construction operations on the concrete floor 1, thus avoiding secondary disturbances to the concrete floor 1, and during installation, only holes need to be drilled on the support beam 4, which effectively reduces the difficulty of reinforcement construction, shortens the construction period, and reduces the reinforcement cost.
[0039] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.
Claims
1. A concrete floor prestressed fiber cloth reinforcement device, characterized in that: It includes a fiber belt which is parallel to the concrete floor and is formed by an even number of layers of fiber cloth which are fully impregnated and cured by impregnating resin, and a tensioning and anchoring mechanism which tensions and anchors the two ends of the fiber belt to the upper ends of the supporting beams on both sides below the concrete floor; the tensioning and anchoring mechanism includes a wedge block, an anchor box with a wedge-shaped through-slit in the longitudinal direction, and a tensioning screw assembly distributed on both sides of the fiber belt in the transverse direction, the end of the fiber belt is divided into two parts in half according to the number of layers, the narrow end of the wedge block is inserted between the two parts, the fiber cloth of the two parts is staggered around the wide end of the wedge block, the through-slit and the wedge-shaped surface of the wedge block match, the end of the fiber belt is tightly stuck in the through-slit with the wedge block, the tensioning screw assembly is tensioned and installed on the anchor box and the supporting beam at the same time, and the prestressing tensioning and anchoring of the fiber cloth are achieved by adjusting the tensioning force of the tensioning screw assembly.
2. The concrete floor prestressed fiber cloth reinforcement device according to claim 1, characterized in that: The fiber belt and the tensioning and anchoring mechanisms at both ends of the fiber belt are distributed along the supporting beam.
3. The prestressed fiber cloth reinforcement device for concrete floor according to claim 1, characterized in that: The fiber belt is made of unidirectional high-performance fiber cloth.
4. The concrete floor prestressed fiber cloth reinforcement device according to claim 1, characterized in that: The wedge block adopts a symmetrical structure in the upper and lower directions, with equal cross-sections in the width direction and a wedge-shaped cross-section in the length direction with a gradient of less than 1 / 10. The width of the wedge block is greater than the width of the fiber cloth, and the ratio of length to width is not less than 1 / 2. Both ends of the wedge block in the length direction are rounded, and the thickness of the narrow end of the wedge block is not less than 5mm. The outer surface of the wedge block is ground and polished at the contact position with the fiber cloth.
5. The concrete floor prestressed fiber cloth reinforcement device according to claim 1, characterized in that: The anchor box is rectangular in shape, with the through seam located at the center of the anchor box in the transverse and thickness directions. There are gaps between the upper and lower sides and the left and right sides of the wedge block and the through seam. Through holes are provided on both sides of the anchor box for passing the tension screw assembly. The through holes are located at the center of the anchor box in the thickness direction and are symmetrical about the transverse center of the anchor box.
6. The prestressed fiber cloth reinforcement device for concrete floor as claimed in claim 5, characterized in that: The length of the through seam and the anchor box is equal to the length of the wedge, the width of the anchor box is four times greater than the width of the wedge and the diameter of the tension screw assembly, and the thickness of the anchor box is twice the maximum thickness of the wedge.
7. The concrete floor prestressed fiber cloth reinforcement device according to claim 5, characterized in that: The diameter of the through hole on the anchor box is larger than the diameter of the tension screw assembly. The support beam is provided with a through-beam hole for passing the tension screw assembly. The diameter of the through-beam hole is larger than the diameter of the tension screw assembly.
8. The concrete floor prestressed fiber cloth reinforcement device according to claim 1, characterized in that: The tension screw assembly includes a high-strength screw, a nut and a pad. The high-strength screw passes through the anchor box and the support beam at the same time. The nut is fitted on the high-strength screw and one nut is pressed on the anchor box, and the other nut is pressed on the support beam through the pad. The tension screw assemblies on both sides of the same end of the fiber belt share a common pad.
9. The prestressed fiber cloth reinforcement device for concrete floor as claimed in claim 1, characterized in that: The ultimate tensile strength of the tension screw assembly is determined by the ultimate tensile strength of the fiber band, and the sum of the ultimate tensile strengths of the tension screw assemblies on both sides of the same end of the fiber band matches the ultimate tensile strength of the fiber band.
10. A method for reinforcing a concrete floor with prestressed fiber cloth, characterized in that: Based on the concrete floor prestressed fiber cloth reinforcement device according to any one of claims 1 to 9: First, holes are drilled at the distribution positions of the tension screw assembly on the support beam, and then the tension screw assembly is passed through the anchor box and the support beam at the same time; then the fiber belt is installed: the single-layer fiber cloth is fully impregnated with impregnation resin and assembled into a fiber belt according to the designed even number of layers. Before the impregnation resin is cured, the end of the fiber belt is passed through the through seam, and then the end of the fiber belt is divided into two parts in half according to the number of layers, and the narrow end of the wedge is inserted between the two parts, and then the fiber cloth of the two parts is staggered around the wide end of the wedge, and then the fiber belt is pulled back so that the end of the fiber belt is tightly stuck in the through seam with the wedge; then the fiber belt is pre-tensioned and formed: the two ends of the fiber belt are divided After they are tightly stuck in the through-slits of the tensioning and anchoring mechanisms at both ends, the nuts in the tensioning screw assembly are operated synchronously at both ends of the fiber belt. By adjusting the tensioning force of the tensioning screw assembly, the fiber belt is pre-tensioned synchronously from both ends and solidified in the pre-tensioned state; then prestressed tensioning and anchoring: the prestress to be applied to the fiber belt is converted into the pre-tensioning force of the tensioning screw assembly and the torque of the nut under the corresponding pre-tensioning force, the nuts in the tensioning screw assembly are operated synchronously at both ends of the fiber belt or one end is operated separately, and the nuts are stopped tightening after the tightening torque reaches the corresponding torque, thus completing the prestressing and anchoring of the fiber belt.