TW200411107A - A cable repairing and enhancing method of a reinforced concrete structure - Google Patents

Abstract

A cable repairing and enhancing method of a reinforced concrete structure for long structural members with multiple juxtaposed stretching main reinforcements includes the steps of: exposing reinforcements; spiraling a cable of proper tensile strength around the main reinforcements to bond them and with its both ends fixed on the main reinforcements; assembling forms to shape a grouting room enclosing the main reinforcements; grouting concrete into the grouting room to envelop the main reinforcements and the cable completely and then removing the forms after concrete congealed. (Diagram2: A cable repairing and enhancing method of a reinforced concrete structure)

Description

200 411 107

[Technical field to which the invention belongs] The present invention relates to a steel-panel repair and reinforcement construction method for reinforced concrete structures, and particularly to a repair-and-reinforcement construction method that utilizes the bounding force of the steel pan to achieve effective strengthening of the structure against deformation. And it has the characteristics of easy material acquisition and simple and fast construction methods. [Previous technology] In recent years, the occurrence of earthquakes at home and abroad has caused considerable loss of life and property even in several large-scale earthquakes. Among them, the collapse of reinforced concrete (RC) buildings is very serious, and the cause of the damage is determined. 10 statistical data analysis, the process of collapse of reinforced concrete buildings, usually starting with the destruction caused by the cylinders as a support structure, the main reason is that the column can not bear ^ caused by repeated lateral force of the earthquake. For example, according to the current structure of the reinforced concrete column 9, it is mainly based on the required cross-sectional area of the column on the basis of the above. A plurality of parallel main bars arranged in parallel at a vertical direction are arranged under 15 μ, and tied a plurality of horizontal box reinforcements at certain intervals around the main reinforcing bars, and then completely covered the main reinforcing bars 91 and horizontal box reinforcements 92 with a concrete material to form the shape of the column 9 after hardening The concrete material provides rigidity for compressive strength of the building, the main steel rib 91 shell provides tensile duty, and the role of the transverse ribs is 20 Xiao to provide lateral support of the main steel bar 91, increasing the shear resistance of the column 9 when the intensity of the cylinder 9 is positioned in the main bearing steel _ 91 and analyzed by an outer force acts 9 destruction cylinder, while subjected to axial forces and lateral forces of the earthquake, 200,411,107

The concrete material in the side layer will crack and peel off first, so that the longitudinal main steel bars 91 and the horizontal stirrups 92 are exposed. If the column 9 is continuously stressed, the main steel bars 91 between the upper and lower adjacent horizontal stirrups 92 may lack support or the yield of transverse stirrups damage, such rapid destruction cylinder 9, so that the main longitudinal steel reinforced against lateral forces Μ characteristics of the beam 5 is around a cylinder 9 prevent damage countermeasure Therefore, in order to enhance the seismic cartridge Effect, currently the United States, Japan, and even China have significantly revised the stirrup specifications for seismic design, which include reducing the spacing, increasing the tie bar, and strictly requiring hooks, etc., making the 10 main bars and transverse stirrups in the column body The combination is as dense as a grid to add a more complete bounding effect to the main reinforcement. However, the denser the main steel bars and transverse stirrups means that the difficulty in construction of bending steel bars and pouring concrete slurry has increased. And going back to talking about improving the toughness and bounding forces of reinforced concrete columns, the performance of spirals is better than that of horizontal boxes. As early as the 1950s, the 15th test showed that the two types of stirrups had almost the same cut-off curve before reaching the strength limit under axial pressure, but when the strength limit was reached, At this time, the column of the transverse stirrup tends to have brittle failure almost immediately, while the concrete shell of the spiral stirrup tends to peel off first, but the concrete column core surrounded by it can still bear the load until the lateral deformation makes the screw 20 When the hoop tendons fall, they can exhibit plastic failure behavior. However, in terms of construction, special tools must be used for the bending of spiral stirrups, and there are restrictions on the arc configuration. There is considerable difficulty in actual construction because the stirrups themselves use general steel bars. Larger, more difficult to bend 200411107

Therefore, it is no wonder that although the seismic performance provided by spiral stirrups is better than that of ordinary transverse ribs, it is rarely used in the column structure of general buildings. '5 10 15, & w of the mouth, by number and density of Ge transverse stirrups, or spiral ribs tank, although there is positive useful in shock resistance for reinforced concrete column 4 increases in the known work quite The great difficulty, not only the construction cost increases, the time of application is also increased. On the other hand, when the #column was damaged by the lateral force of the earthquake, but the internal main steel bar did not produce a buckling phenomenon, at this time, there is a need for a quick and effective reinforcement method to avoid further damage to the structural members. For all the methods of repairing and strengthening concrete buildings, it is impossible to instantly and quickly reinforce structural components such as columns. Some methods are even more difficult to design and construct than to rebuild. Therefore, it is the main object of the present invention how to have simple and quick requirements for construction and repair of structural members. Eleven SUMMARY OF THE INVENTION Accordingly, an object of the present invention, i.e. to provide a use of a certain tensile cable intensity as the confinement of the main reinforcement and reinforced concrete structures reinforced: Repair reinforcing administered Health Law, to improve the structure of the tamper resistant properties At the same time, it also has the characteristics of easy material acquisition and simple and fast construction. Therefore, the construction method for repairing and reinforcing a reinforced concrete structure with a steel cable according to the present invention is applicable to the structure of a long reinforced concrete structure in a force building: the structural members form the opposite in the length direction—the _ end portion and a second end portion, and a plurality of the structural member having a first end portion, extending columns ^ * 5 200 411 107 Jie

Nobuyuki main reinforcement and a cladding of reinforced concrete such master; the construction method comprising the steps of · the first main steel structure exposed to the outside, taking a cable having a certain tensile strength of the rope is fixed at one end Next, on one of the main steel bars near the first end portion, a steel cable is spirally wound around the main steel bars in a spiral manner toward the second end portion to surround the main steel bars. Then fix the other end of the steel cable to one of the main steel bars. Thereafter, to the combination of a plurality of templates 10 define a plasma space surrounded by the main reinforcement of irrigation and the like. A concrete slurry is filled into the grouting space to completely cover the main reinforcing bars and steel. Finally, the formwork is removed after the concrete slurry has solidified and hardened. [Embodiment 15] the invention and other technical contents, characteristics and effects, in the following detailed description with reference to the drawings, one preferred embodiment will be apparent to understand. Referring to the second figure, a preferred embodiment of the steel cable repair and reinforcement construction method of the reinforced concrete structure of the present invention is a repair of a reinforced concrete column 20 as an example. The application is when the column is damaged and the surface concrete Under the condition that cracks have not occurred or there is no slight buckling, the main steel bars inside the column are not bent outward at this time, and the column is reinforced immediately. Wherein the cylinder 1 is formed with a first end portion close to the _ _ 200411107 1〇1 downward in the longitudinal direction perpendicular

And a second end portion 102 located above, and a column] are two: Reinforcement: The political structure has a plurality of main steel bars 11 extending side by side from the first end to the second end 1G2, and is bounded in the main The transverse stirrups 12 on the outside of the reinforcing bar U and a concrete material for filling the main reinforcing bars u and the stirrups 12 are filled. Step construction method of the present invention is as follows: ίο 15 20 1 First, as the outer surface of the cylinder has been destroyed, it is erected in the first side of the cylinder i count ㈣_ support structure 2, such as steel, to reduce the load of the cartridge and anti- Continue to damage, and then use civil tools to remove the cracked surface concrete of column i, so that the main steel bar U and hoop 12 inside column 1 are exposed. At this time, the number of main tendons can also be increased by means of planting tendons as needed. θ As shown in the third to fifth figures, 'Take-a steel cable with tensile strength. In this example, a steel cable 3 with a diameter of 6 mm is used, and the steel cable 3 is red with several prime wires 0, by multiple strands twisted together strands, the steel wire mirror 3 - a, column 1 is fixed near the bottom - of the end portion of one of the main ⑻ steel ribs 11 ± 'solid & way is to use - clip box 4, via the clip 4 has a first locking can cause _ the clamping action of the - clamp 41 - loss of the second member 42 'so that the 3' end of polished stainless steel wire, the fine φ bypass, the steel ribs 11 formed in a main The ring-shaped end portion 31 of the main reinforcing bar is looped around, and the steel cable 3 located between the pinch clamp 41 and the second clamp 42 is clamped by locking the first clamp 41 and the second clamp of the clamp 4. Further, the annular end portion 31 is fixed without being separated from the main reinforcing bar 11. Of course, use a fixed loss is not the only way _ 4, mirror long as the steel wire 3 - 11 mesh reinforced any master prescribed - - end of which representing manner species Jieke Ο 10 200411107

Figure 5 (to facilitate the description of the repair and reinforcement of the present invention, the original catching ribs 12 in the figure are the same as-,, l, and Figure 2) 'Make the steel cable 3 from the first 101 to the second end near the column 1 In the direction of 102, the main steel ribs 11 are wound around the main steel bar 11 in a spiral manner at intervals of 5 to 7 cm. In actual operation, the distance between the upper and lower adjacent 11 of the main steel bars 11 surrounded by the steel mirror line 3 can be appropriately adjusted according to the degree of reinforcement and the surrounding beams can be applied at a proper time. 3-Appropriate tension to maintain the steel Tension of the mirror line 3. '

After that, the other end of the steel wire 3 is also fixed to one of them, the main reinforcing bar u, in the same manner as the locking clamp 10 of the same. As shown in the sixth figure, a plurality of templates 5 are used to surround the exposed main steel ribs Π and the steel mirror line 3 behind the beam to define a potting space 50 and reserve one and grout. The grouting opening 51 connected to the space 50, because this sting is a mature technology of general concrete grouting engineering, is not described here in detail15. Finally, the concrete mortar from the filling mouth 51 is filled into the filling space of the main reinforcement 11 and the like, thin steel wire 3 inner 5〇 completely coated. After the concrete is solidified and hardened, the formwork 5 is removed to complete the repair of the column. And the reason why the use of cable lines mainly based on its excellent anti 2〇 tension properties. Because the steel cable is a combination of twisted multiple plain wires, the defects of each plain wire are scattered over the entire length of the overall steel cable. Therefore, the impact of load damage on the overall steel cable is small, and It is very safe. In addition, although the plain yarns are twisted with each other, they are independent of each other. If they suffer external damage, only 11 200411107

It is because the intensity of the damage of the plain cross section alone is reduced, and the intensity of τ decreases rapidly due to the increase of defects. Therefore, the use of steel cable as a structural material has the following characteristics: nubuyi has higher tensile strength than ordinary steel, (2) has a lower elongation at break than ordinary steel, and (3) has a lower modulus of elasticity than ordinary steel. There is no obvious drop point before, and the squall line has the initial extension of the force. The stress-strain relationship curve is a quadratic curve in the low tension range. Further 2〇 ίο 15 'throughout the steel wire in addition to the mechanical properties on which the stirrup generally having a freely bendable than the softness is also important consideration ^ _ items available on the official construction, much higher than the bobbin - as more stirrups Easy to use and does not require special bending tools. In addition, because the lye is twisted from plain wire, and its surface is formed with many depressions and protrusions, the grip between the concrete material and the steel cable is also very good. It should be more slub-like than ordinary steel bars. The surface has better grip strength. In order to verify (iv) after the elapse of a steel cable repair reinforcement has deformability, the inventors conducted a wins out in the National Earthquake Engineering Research Center: Test, the following summary only out - comparison of the calling line complement to the data - the standard test body and. ^ - wherein the standard test specimen is in accordance with the old steel ribs rectangular cross-section of the standard design of mixed Ling soil column, the column cross section 5〇cm > <% cm, return of 170 cm, the main steel: mining " intermediate Root The # 8 rebar's horizontal hoop without any truncation and surrendering strength is g. The # 3 rebar 2_kg / ⑽ of the surrendering strength is used and is arranged at a height of 4 () cm. Coagulation: 12

1015200411107 strength of 210kg / cm2, the width of the base of the cartridge is located 180 cm, length 245 cm, a thickness of 74 cm, between steel to # 8 are arranged at intervals of 11 cm, and the concrete filling the same material above, below and around. Applying an axial force test was 52.5 hydraulic pump nozzle to simulate the static load of the cylinder, the other hydraulic actuator to laterally acting on the actuator cylinder to simulate the lateral force of the earthquake. After the anti-load test coating damage up until the cartridge, displacement of the abscissa, the ordinate is the lateral force results in the following data.

Drift Ratio (%) (s) §odt 1§3

: Break: Standard test specimen after the re-use of the construction method of the present invention in the steel cable, the 'repeated load tests conducted under the same conditions until the very body damage, and the following data obtained in the same manner. 20

13 200411107

Drift Ratio (° / square) 700 -5 -4 -3 -2 -1 IS δ

Displacement (mm) ίο wherein 'toughness ratio (Drift Ratio) / z is defined as the ratio of the height of the cylinder lateral displacement, by the standard test specimen toughness ratio # = 28 and the test specimen in a cable line repair # = A comparison of 10.5 shows that the tenacity of the post-repair column is greatly improved, showing that the post-reinforced column with steel cables can effectively improve the resistance to earthquake damage15. In addition, from the comparison of the hysteresis loop of the standard test specimen and the hysteresis loop of the test specimen after repair, it can be seen that the hysteresis loop of the test specimen after repair is obviously fuller, which shows that the repaired specimen is resistant to dissipation. The effect of energy is also better. After reinforcing the ability of reinforced concrete columns to resist lateral seismic forces without damage repair via cable line shows the upgrade does have 20 large amplitude. Summarized above, the present invention is constructed of reinforced concrete to repair the cable reinforcing construction method has the following advantages: high confinement intensity: lines, since the wire rope after processing its anti 14200411107

The tensile strength can reach 8000kg / cm2. Although the strength of the steel cable varies with the material and processing process of the plain wire used, it is generally higher than the damage strength of ordinary steel bars or steel, and The overall strength variability is small, so when it is surrounded by the main steel bar of the east column, the effect is like a spiral stirrup, which can greatly improve the ability of the structure to resist earthquakes and deformation. 5 Second, the construction is fast and easy: because the steel winding is easy to bend, it can be carried out manually without special tools when surrounding the main steel bar, and it is quite simple to fix, not like horizontal stirrups, or even spiral hoops. Tendons need to be bent with special machines or even welded, and the construction is naturally fast. In addition, another advantage of using the flexibility of the Gangli wire is that it can be freely bent with the terrain and features of the construction, as long as it has a small room for passing through, it can be stationed, which is not limited to the construction site and the surrounding building structures. Impact, for example, with the wall: To connect the pillars, just punch out where the pillars meet the wall-the space where the steel cables can pass. "15 Third, the material is easy to obtain because · steel mirror line is already eligible for the regulation of the market and widely used material in the immediate emphasis on reinforcing the occasion of construction, ease of material is also made to increase the speed of Cheng Wei - term Important factors.-Fourth, the cost is low. Based on the construction using steel mirror lines and the materials obtained by Heyi 1 * talents, the overall construction cost can be reduced. Therefore, using the know-how of this invention will not matter. Permanent or temporary structural strengthening is a cost-effective method. = Because of the pillars of the structure under the old building regulations, because of the strict requirements for the stirrup construction at that time or the insufficient length of the pillar reinforcement , Though; hour 15 200411107

The column is not damaged by the lateral force of the earthquake but is potentially dangerous. It can also be reinforced in the manner of the invention. As shown in FIG seventh ίο 15, but to less than a cross-sectional area of the structural integrity of the reinforced concrete pillar as an example, i.e. having a plurality of original old primary reinforcement 61, a plurality of confinement by the old main reinforcement ribs 61 of such 62, and the old concrete material 63 covering these main reinforcing bars 61 and stirrups 62. When enlarging the cross-section area of the original column as a reinforcement, firstly, because the column is not damaged, the concrete material 63 does not need to be completely removed, and its surface only needs to be roughened (that is, a non-smooth surface is formed). Plant a new main reinforcing bar u at the position required by the pillar ㈣ according to the enlarged section area (currently, the technology of planting tendons on the market has matured and has a certain anchoring strength, and will not be repeated here), and Using the same method as described above, the steel cable 3 is spirally wrapped around and fixed to the new main frames U, and then a plurality of forms are combined, new concrete slurry is poured, and the concrete slurry is to be hardened. The formwork can be removed so that the cross-sectional area of the original column can be enlarged to achieve the purpose of strengthening its structural strength. However, the above is only a preferred embodiment of the present invention. Although the reinforced concrete column and the Steel cables are taken as an example to illustrate, but those skilled in the art can naturally infer that it can be used for the reinforcement of reinforced concrete plaques, and it is not limited to steel cables, as long as it has a certain tensile strength and can bend freely. Can also be added application. Also, the cylinder may not necessarily be full repair reinforcing manner by the second column below - the upper end to the second end of the reinforcing ,, fix both the first or second end of the reinforcing local repair. INTRODUCTION When it can not be said to define only the embodiment of the present _ invention scope ®, a Generally invention under this application 1620200411107

The simple equivalent changes and modifications made to the scope of the patent and the contents of the invention specification should still fall within the scope of the invention patent. : Brief Description of the drawings] The first figure is a schematic view of a conventional reinforced concrete column subject to destruction; Second embodiment FIG is a schematic construction method of the present invention, one preferred embodiment described - except the cartridge playing damaged layer after the concrete addition to the internal main reinforcement reveal FIG third preferred embodiment is constructed in one of the Bowden cable of the application; fourth FIG. 10 is a schematic diagram of the preferred embodiment of the cable end is fixed to a steel main embodiment described utilizing a clip for fixing the patterns; FIG fifth preferred embodiment is the schematic diagram of the main cable of steel spirally such confinement; FIG sixth preferred embodiment is that the combination of templates to a plurality of A schematic diagram of concrete grouting is provided; and FIG. 7 is a cross-sectional view illustrating the application of the construction method of the present invention to a column with insufficient cross-sectional area to expand its cross-sectional area. 200 411 107 Main ring teeth elements Videos representing a symbol of the drawings briefly described a second clip cartridge 42] 101 ... 102 ... first end portion 11. The second end portion 12 ... main reinforcement stirrups 2 * ..... * * * Temporary support structure 3 · ... * Steel cable 30 · · * · Plain wire 31 * ... Ring end 4 · * * · Clip 41 · * · * First clip 5 · · · · · Template 50 ...... Grouting space 51 · · · Grouting opening 61 ... Main reinforcement 62 · · · · Stirrup 63 · · · · Concrete material 9 · · · · · Pillar 91… · · Main reinforcement 92 · · · · Crossbar Tendon

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Claims (1)

200 411 107 -A kind of reinforced concrete structure repairing and strengthening construction method, which is suitable for use in buildings-long reinforced concrete structural members, the structural members form a reduction in the length direction-the first end and the second end, The structural member has a plurality of main steel bars extending from the first part toward the second end and concrete materials covering the main steel bars; the construction method includes the following steps (1) under the conditions exposed outside, take - having - throughout a given anti-tensile strength steel, the steel so that the one end is fixed close to the one of the first end portion of the main reinforcement; (2) the cable helically to the second end portion-wise direction around the ring to the main temple confinement reinforcement; (3) the steel of the mirror fixed to the other end of which one of the primary reinforcement; (4) the combination of a plurality of templates defining a surround such filling of the space in the main reinforcement; '(5) to a concrete slurry is filled into the main steel ribs and the like Si steel laid completely covered within the filling space; ^ CO after hardening of the concrete to the removal of such templates solidified slurry . 2. The method of repairing and reinforcing the steel according to the reinforced concrete structure described in item 1 of the scope of the patent application, wherein the method of fixing the steel pair and the corresponding main steel bar in this step) and step (3) to each other is the bypass of the main steel cable one end of an annular rear end portion, and the use of a cable fixed to the clip 2 = shaped end portion so as not departing from the main reinforcement. | 3 · concrete construction of the cable according to the item 2 Tong patent multiplexed range reinforced reinforcing construction method, wherein the locking clip have mutually ^ brother a clip 19200411107 4. A steel cable repair and reinforcement construction method for reinforced concrete structure, which is suitable for the construction of long-shaped reinforced concrete structural members, the structural members form the opposite in the length direction-the first end and a second end The construction method includes the following steps: 植 plant a plurality of new main gluten in the length direction of the structural member, take-a steel environment with a certain tensile strength, and fix the steel around the end near the - of which the one end portion of the main reinforcement; ⑺ the cable helically around the second end portion-by-turn directions to the main reinforcement of such confinement; the other end (3) of the cable fixing in one of the primary reinforcement; (4) the combination of a plurality of templates defining - filling the space surrounded by the main reinforcement of these; (5) The slurry is filled into a concrete after the other in the main steel bars depends completely coated and enlarged of the original cross-sectional area of the filling space of the inner structural member (6) to be the removal of such hardened concrete mortar solidified template. 5. According to the reinforced concrete structure steel repair and reinforcement construction method described in item 4 of the patent scope, wherein step (1) and step (the method in which the steel cable and the corresponding main steel bar are fixed to each other) The looped end is formed after one end of the steel cable passes around the main steel bar, and the ring-shaped end of the steel cable is fixed by a clamp so as not to be separated from the main steel bar. the concrete construction of the cable 5 to repair reinforced reinforcing construction method of multiplexing 20200411107 'where' each one of the clip having a first locking member and a second clamp clip, by means of the first and the second clip The two clamps are close to each other to clamp the steel cable. twenty one