CN114293809A - Construction method and structure for reinforcing variable cross section of beam - Google Patents
Construction method and structure for reinforcing variable cross section of beam Download PDFInfo
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Abstract
The invention discloses a construction method and a construction for reinforcing a variable cross section of a beam, and belongs to the field of building construction. Aiming at the problems that the construction of the enlarged cross section of the existing beam is difficult and the construction quality is poor when meeting a column joint, the invention provides a construction method for reinforcing the variable cross section of the beam, which comprises the steps of chiseling floor slabs at two sides of the original beam to form a position-moving groove; chiseling a floor slab along the length direction of the original beam by taking the end part of the top surface of the original beam as a starting point, and chiseling a groove on the top surface of the original beam to form a construction groove; binding new top ribs in the walking grooves along the length direction of the walking grooves, and when the new top ribs meet the original column, the new top ribs bypass the two sides of the original column respectively; and closing the beam top stirrups at the beam end part, forming a new reinforcement framework together with the newly added top reinforcements and the original beam top reinforcements, and pouring. The construction method avoids the problem of construction difficulty caused by directly implanting the newly added top ribs into the original column by bypassing the newly added top ribs from the two sides of the original column, reduces chiseling operation of the floor slab and arrangement of temporary supports, shortens construction period, ensures construction quality and construction applicability.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method and a construction for reinforcing a variable cross section of a beam.
Background
In the prior art, the building reconstruction and extension often meets the condition that the bearing capacity of the original concrete beam needs to be greatly improved. For concrete beams, the reinforcing method mainly comprises steel cladding and section enlarging reinforcement. Wherein, the steel-clad reinforcement is completely bonded with the original component by structural adhesive, so the cost is high, and the durability and the fire resistance are general; the bearing capacity of the component is greatly improved by increasing the section and reinforcing, and in the traditional method for increasing the section on three sides of the beam, the floor slabs within the section width range increased on two sides of the beam top are chiseled along the span direction of the beam so as to arrange longitudinal ribs of the beam top; however, when the reinforcing steel bars with the enlarged cross sections of the beams meet the joints of the concrete columns, the space for planting the reinforcing steel bars is small, the construction is difficult, the construction quality is difficult to guarantee, and even the design requirements are difficult to meet. How to avoid the longitudinal reinforcement bar planting of roof beam, reduce the construction degree of difficulty, improve construction quality, be the problem that needs to solve among the prior art.
Corresponding improvement is also carried out aiming at the problems, for example, Chinese patent application No. CN200910104433.0, the publication date is 2010, 2 months and 17 days, the patent discloses a beam-column node reinforcing structure adopting a cross-section enlarging method, which comprises an original column body and an original beam, wherein the cross-section enlarging beam is arranged below the original beam, a steel sleeve hoop is fixedly connected to a node part of the original column body, which is connected with the cross-section enlarging beam, through a chemical anchor bolt, and the steel sleeve hoop is sleeved on the original column body; and a new longitudinal rib parallel to the original beam is cast in the beam with the enlarged section, and a hook parallel to the outer surface of the steel ferrule is arranged at the end part of the new longitudinal rib and fixedly connected to the outer surface of the steel ferrule. The construction method comprises the following steps: a) designing, manufacturing and installing a steel ferrule; b) anchoring; c) welding new longitudinal ribs; d) bonding; e) and (5) casting the beam with the enlarged section. The invention ensures that under the condition that a plurality of beams are intersected with one column, no holes are drilled on the beams for planting the steel bars, no steel bars are cut off and then connected, the construction is simple and convenient, and the labor and the materials are saved; the original column does not need to be drilled with more and deeper holes, the newly-matched longitudinal ribs do not need to be cut off and then connected, and the method is very favorable for the effect of structure reinforcement. The disadvantages of the patent are that: although the problem is solved, a plurality of holes are not drilled in the original column, the overall strength is general, and the reinforcing effect is limited.
As another example, chinese patent application No. CN201820079536.0, published as 2018, 9/4, discloses a frame beam with a reinforced cross section, which includes a floor slab, an original frame beam, a reinforced steel plate, a new beam stirrup and a concrete reinforcing layer, wherein the top of the original frame beam is anchored in the floor slab, the original frame beam includes an original beam stirrup for reinforcing shear resistance, the outer surface of the original frame beam is fixedly provided with the reinforced steel plate by a chemical bolt, the reinforced steel plate is longitudinally wound with the new beam stirrup, and the top of the new beam stirrup is anchored in the floor slab and welded to the original beam stirrup; concrete is poured into the gap between the new beam stirrup and the reinforcing steel plate, the new beam stirrup is wrapped by the concrete in an outward penetrating mode to form a concrete reinforcing layer, and an armpit structure is arranged at the intersection of the concrete reinforcing layer and the floor slab. The disadvantages of the patent are that: although the stability and the safety can be integrally enhanced, the construction is complicated and the period is slow.
Disclosure of Invention
1. Problems to be solved
The invention provides a construction method and a construction structure for reinforcing a variable section of a beam, aiming at the problems that the construction of the enlarged section of the existing beam is difficult and the construction quality is poor when meeting a column joint. The construction method avoids the problem of construction difficulty caused by directly implanting the newly added top ribs into the original column by bypassing the newly added top ribs from the two sides of the original column, reduces chiseling operation of the floor slab and arrangement of temporary supports in the construction process, greatly shortens the construction period, ensures the whole construction quality and meanwhile ensures the applicability of construction; the invention has simple integral structure and high construction efficiency, and greatly reduces the bar planting operation while meeting the stress effect on the original beam with the section needing to be enlarged.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A construction method for reinforcing a variable cross section of a beam comprises the following steps:
s1: chiseling floor slabs on two sides of the top of the original beam to form a walking groove, wherein the length direction of the walking groove is consistent with the length direction of the original beam, and the length of the walking groove is not less than one fourth of the beam clear span value of the original beam;
s2: chiseling a floor slab along the length direction of an original beam by taking the end part of the top surface of the original beam as a starting point, and chiseling a groove on the top surface of the original beam to form a construction groove, wherein the length of the construction groove is not less than one fourth of the beam net span value of the original beam; meanwhile, the slab top steel bars of the chiseled floor slab are kept disconnected, and the slab bottom steel bars of the chiseled floor slab are kept still;
s3: constructing a newly-added top rib in the walking groove along the length direction of the walking groove, when the newly-added top rib meets the original column, the newly-added top rib bypasses the original column respectively, and then fixing the newly-added top rib; constructing beam top steel bars on the side edges of the original beam without chiseling grooves, and connecting the beam top steel bars with the newly-added top steel bars;
s4: constructing a plurality of beam top stirrups in the construction groove, and binding the newly-added top stirrups with the steel bars in the original beam by the beam top stirrups;
s5: and after the binding is finished, re-welding the plate top reinforcing steel bars of the chiseled floor slab into a whole, and then pouring concrete or grouting material to finally finish the construction of the beam enlarged section.
Furthermore, in step S3, constructing erection bars for respectively positioning the two newly added top bars in the positioning grooves, wherein the erection bars and the newly added top bars are bound by the beam top stirrups.
Furthermore, the number of the beam top stirrups is not less than six.
Furthermore, in step S4, a plurality of additional steel bars are further constructed between the newly added top bars on both sides of the original beam, and the additional steel bars are connected with the newly added top bars.
Furthermore, in step S5, a beam bottom steel bar is constructed at the bottom of the original beam, the beam bottom steel bar is fixed to the original column by chemical bar-planting, and the beam bottom steel bar and the new top steel bar are bound by the new stirrup.
A structure adopting the beam variable cross-section reinforcement construction method comprises the walking grooves formed in two sides of the top of an original beam, the length of each walking groove is not less than one fourth of the beam clear span value of the original beam, the construction grooves formed in the end portions of the top surface of the original beam along the length direction of the original beam, the length of each construction groove is not less than one fourth of the beam clear span value of the original beam, newly-added jacking ribs are arranged in the walking grooves along the length direction of the walking grooves, one ends, close to the original columns, of the newly-added jacking ribs are fixed after bypassing the original columns, the newly-added jacking ribs and steel bars in the original beam are fixed through beam top stirrups, beam top steel bars are arranged on the side edges of the original beam without chiseling grooves, and the beam top steel bars are connected with the newly-added jacking ribs.
Furthermore, the distance between the walking groove and the side edge of the original beam is +10cm larger section width required by the beam.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, when the beam meets the column, the newly added top ribs bypass from two sides of the original column, so that the problems of construction difficulty and construction quality difficulty caused by directly implanting the newly added top ribs into the column are avoided, and the construction efficiency and quality are effectively ensured; meanwhile, the phenomenon that the floor slabs in the width of the enlarged cross section on the two sides of the beam top are all chiseled is changed, only the beam top and the partial floor slabs on the two sides of the beam top are chiseled, the original stress effect of the original beam with the enlarged cross section is ensured, the chiseling operation of the floor slabs and the arrangement of temporary supports in the construction process are greatly reduced, the construction period is greatly shortened, the economic benefit is improved, the overall constructability is improved, the restriction of the field environment is small, and the construction applicability is further ensured;
(2) according to the invention, the erection steel bars are additionally arranged, and the erection steel bars play a role in positioning and fixing two newly-added top ribs, so that the structural requirement of the distance between the newly-added top ribs is met, the newly-added top ribs can normally and stably play a role in the function, and the newly-added top ribs can greatly improve the bending resistance bearing capacity and the shearing resistance bearing capacity; the beam top stirrups are arranged, so that the newly added top reinforcements and the original beam inner reinforcement form a whole, and the reliable transmission of force is ensured; the beam top stirrup is used for bearing the transverse component force generated by bending the newly added top rib around the original column, so that the effective transmission of the pulling force of the newly added top rib is ensured;
(3) the stability of the newly added top rib is further enhanced through the additional steel bar, the bearing capacity of the section needing to be enlarged in the width range is improved, the integral structure is ensured to meet the stress requirement, and the stability is enhanced; the additional steel bars and the newly added top bars are welded on one side, so that the additional steel bars cannot be planted into the original column, the construction difficulty is reduced, the construction efficiency is improved, and the construction period is shortened; the bottom and the side surfaces of the original beam enter the original column in a bar planting mode to realize the effect of reinforcing three surfaces of the beam, different constructions are carried out aiming at different positions, the construction progress is improved, and meanwhile, the construction efficiency and the construction effect are ensured;
(4) the reinforcing structure provided by the invention has the advantages that the whole structure is simple, the construction efficiency is high, the reinforcing structure does not need to be subjected to bar planting operation while the stress effect of the original beam with the section needing to be increased is met, the construction efficiency is high, the reinforcing structure is not easily influenced by the distribution of reinforcing bars in the original beam and the original column in the field environment, the construction difficulty is greatly reduced, the chiseling operation of a floor slab is reduced, the arrangement of field temporary supports is reduced, the cost is saved, the construction efficiency is greatly improved, and the whole universality is high.
Drawings
FIG. 1 is a schematic view of a beam chisel slot configuration;
FIG. 2 is a schematic view of the overall structure of the present invention;
FIG. 3 is a schematic view of the structure A-A of FIG. 2;
FIG. 4 is a schematic view of the structure B-B of FIG. 2;
FIG. 5 is a schematic view of the structure C-C of FIG. 2;
FIG. 6 is a schematic view of an enlarged cross-section of beams on both sides of an original column;
fig. 7 is a schematic view of an enlarged cross section structure of a single-side beam of an original column.
In the figure: 1. primary column; 2. original beam; 3. constructing a slot; 4. original floor slab reinforcing steel bars; 5. plate top reinforcing steel bars; 6. plate bottom steel bars; 7. a beam top stirrup; 8. beam top reinforcing steel bars; 9. stretching a rib; 10. a beam waist rib; 11. newly planting reinforcing steel bars; 12. newly adding stirrups; 13. chemical bar planting; 14. erecting steel bars; 15. reinforcing steel bars at the bottom of the beam; 16. and adding a top rib.
Detailed Description
The invention is further described with reference to specific embodiments and the accompanying drawings.
Example 1
As shown in fig. 1 to 7, a construction method for reinforcing a variable cross section of a beam includes the following steps:
s1: chiseling floor slabs on two sides of the top of the original beam 2 to form a walking groove, wherein the length direction of the walking groove is consistent with the length direction of the original beam 2, the walking groove is not less than one fourth of the beam net span value of the original beam 2, the walking groove is wider than the beam plus the required large section width plus 10cm, and enough construction space is reserved; the width is the distance from the walking groove to the side edge of the top of the original beam 2; the subsequent construction is facilitated, and the floor slab chiseling operation is not performed too much, so that the construction efficiency is improved; it is explained here that six faces of the original beam 2 are respectively an upper face, a lower face, a left face, a right face and a front face, the upper face is connected with the floor, the lower face is arranged opposite to the upper face and is not connected with any object, the front face and the rear face are connected with the original column 1, the original column 1 plays a supporting role for the original beam 2, two sides of the top of the original beam 2 are the left face and the right face of the original beam 2, the walking grooves are grooves which are arranged at the left position and the right position of the top of the original beam 2 along the length direction of the original beam 2 and are grooved along the length direction of the original beam 2, the length of the walking grooves is not less than one fourth of the beam net span value of the original beam 2, and the beam net span value L of the original beam 2 is not less than one fourth of the beam net span value LnRefers to the length of the beam between two primary columns 1; when encountering the original column 1 connected with the original beam 2, simultaneously chiseling floor slabs on two sides of the original column 1 (wherein the two sides are in the same direction as the two sides of the original beam 2), and communicating with the walkway to facilitate subsequent construction, wherein the length of chiseling the floor slabs on the two sides of the original column 1 is the length of the original column 1 exceeding the length direction;
s2: chiseling a floor slab along the length direction of the original beam 2 by taking the end part of the top surface of the original beam 2 as a starting point, wherein the end part of the top surface is connected with the original column 1, so that the floor slab is chiseled in the direction far away from the original column 1, a working groove 3 is formed by chiseling the groove on the top surface of the original beam 2, and the length of the working groove 3 is not less than one fourth of the net span value of the original beam 2; meanwhile, the slab top steel bars 5 of the chiseled floor slab are kept disconnected, so that the construction and binding of the steel bars which are newly introduced subsequently are facilitated, the slab bottom steel bars 6 of the chiseled floor slab are kept still, and the steel bars 4 of the original floor slab are kept still in the section where the floor slab is not chiseled on the top surface of the original beam 2; the traditional method for enlarging the cross section of three surfaces of the original beam 2 is to chiseling all floor slabs within the range of enlarging the cross section width of two sides of the beam top along the span direction of the beam so as to arrange longitudinal ribs of the beam top; in the step, the floor slabs within the range of increasing the section width do not need to be completely chiseled, only the length which is not less than one fourth of the net span value of the original beam 2 needs to be chiseled, the floor slabs at the tops of the rest original beams 2 are completely reserved, and the beam top through long steel bars are arranged at the bottom of the slab and are not influenced; in the step, one fourth of the net span value of the beam is obtained by continuously carrying out stress analysis and test on the beam top longitudinal ribs needing to be added by the inventor, so that the stress effect of the section beam can be ensured to be increased, and the chiseling operation of the floor slab can be reduced to the maximum extent; of course, the length range of the construction groove 3 is between one fourth of the beam clear span value of the original beam 2 and all chisels, and the specific length can be selected according to the specific site construction condition;
s3: constructing a newly added top rib 16 in the walking groove along the length direction of the walking groove, when the newly added top rib 16 meets the original column 1, the newly added top ribs 16 respectively bypass from the original column 1, wherein the bypass means that when the newly added top ribs 16 meet the original column 1, the newly added top ribs 16 are bent and pass through the grooves at the two sides of the original column 1, namely, when the beam is enlarged in section and meets a column node, the beam top haunch mode is adopted, namely, the newly added top rib 16 is bent, the haunch length E needs to meet the requirement of the angle of the steel bar bending at 1:6, namely for the newly added bent top rib 16, the haunching height D/haunching length E is not more than 1/6, so that the newly added top rib 16 for reinforcement bypasses the two sides of the original column 1 to be used as a newly added steel bar with a combined cross section, and the bending resistance bearing capacity and the shearing resistance bearing capacity are greatly improved while the steel bar planting of the newly added top rib 16 is avoided; then fixing the newly added top rib 16 which bypasses the original column 1; it should be noted here that, for the newly added top rib 16 bypassing the original column 1, there are two cases, one is that both sides of the original column 1 are connected with the beam as shown in fig. 6, and at this time, the newly added top ribs 16 bypassing both sides of the original column 1 in the two-sided beam are connected; the other is that one side of the original column 1 is connected with the beam, as shown in fig. 7, the newly added top ribs 16 which bypass the two sides of the original column 1 are welded on the single side of the column to complete the fixation; the specific connection mode depends on the specific situation on site; at 2 side construction roof beam top reinforcing bars 8 of former roof beam of not chiseling the groove, be connected roof beam top reinforcing bar 8 with newly-increased top muscle 16 simultaneously, promptly to former roof beam 2, it only chisels the floor in roof beam top tip and side to form the groove that corresponds, at the newly-increased top muscle 16 of ligature in the groove of walking that chisels the floor correspondence, arrange roof beam top reinforcing bar 8 at the roof beam top side that does not chiselize the floor and correspond, roof beam top reinforcing bar 8 is and hugs closely floor bottom setting, consequently newly-increased top muscle 16 and roof beam top reinforcing bar 8 are not on same horizontal plane. Specifically, although the beam top reinforcing steel bars 8 are arranged at the positions where the floor slab is not chiseled, the end parts of the beam top reinforcing steel bars still extend out of the position walking grooves on two sides of the top of the original beam 2, the specific extending length of the beam top reinforcing steel bars is 20 times of the diameter of the beam top reinforcing steel bars 8, and the length of the beam top reinforcing steel bars extends into the position walking grooves to be in better lap joint with the newly added top reinforcing steel bars 16.
Preferably, in the step, the construction of the erection steel bars 14 for respectively positioning the two newly added top ribs 16 in the walking grooves 3 is further included, the erection steel bars 14 and the newly added top ribs 16 are bound through the beam top stirrups 7, and because the newly added top ribs 16 are respectively arranged in the two walking grooves 3, the arrangement of the erection steel bars 14 can effectively determine and position the width between the two newly added top ribs 16, so that the distance between the two newly added top ribs 16 meets the construction requirement; further, here, it should be noted that: the number of the newly added top ribs 16 in a single walking groove 3 is not specifically required, and corresponding selection can be performed according to the actual construction condition and the bearing requirement; the arrangement of the erection steel bars 14 is to meet the requirement that the space between the newly added top bars 16 in the two walking grooves 3 meets the industry requirement and specification;
s4: constructing a plurality of beam top stirrups 7 in the construction groove 3, wherein the number of the beam top stirrups 7 is not less than six, so that the condition that the excessively low number of the beam top stirrups 7 cannot meet the requirement on connection strength is avoided; the newly added top rib 16 is bound with the steel bars in the original beam 2 by the beam top stirrup 7, the newly added top rib 16 is stably connected with the steel bars in the original beam 2 by the beam top stirrup 7, and the newly added top rib 16, the erection steel bars 14, the beam top stirrup 7 and the steel bars in the original beam 2 are connected to form a whole reinforcement cage, so that the compact filling between the combined cross section and the original concrete can be ensured, and the reliable force transmission is ensured; and more importantly, a transverse component force is generated when the newly added top rib 16 is bent by winding around the column, and in order to ensure effective transmission of the tensile force of the newly added top rib 16, the beam top stirrup 7 is adopted to bear the transverse component force generated by the newly added top rib 16, so that the newly added top rib 16 can stably and firmly exert the function thereof; furthermore, a plurality of additional steel bars are constructed between the newly-added top ribs 16 on the two sides of the original beam and connected with the newly-added top ribs 16, the additional steel bars are similar to the reinforcing ribs, and in order to make up for the problem that the strength of concrete reinforcement is reduced only in the range of increasing the width of the section, the additional steel bars and the newly-added top ribs 16 are welded in a single-side mode, so that the bearing capacity of the original beam 2 in the range of increasing the width of the section is enhanced while the connection quality is ensured;
s5: after binding, the plate top steel bars 5 of the chiseled floor slab are welded into a whole again, at the moment, the operation of increasing the section of the top surface of the original beam 2 is completed, the method also comprises the steps of constructing beam bottom steel bars 15 at the bottom of the original beam 2, fixing the beam bottom steel bars 15 with the original column 1 in a chemical bar planting mode 13, and binding the beam bottom steel bars 15 with the newly-added top steel bars 16 through newly-added stirrups 12; namely, a newly-implanted steel bar 11 is constructed in the length direction of the original beam 2 and is directly implanted into the original column 1, so that the operation of enlarging the section of the bottom surface of the original beam 2 is completed; still include 2 sides along roof beam length direction construction roof beam waist muscle 10 at former roof beam, roof beam waist muscle 10 also is fixed with former post 1 through the mode of chemical bar planting 13, and roof beam waist muscle 10 is connected through lacing wire 9 and the reinforcing bar on former roof beam 2, accomplishes the operation to the 2 sides of former roof beam increase the cross-section, carries out concrete or grout material afterwards and pours, finally accomplishes the roof beam and increases the construction of cross-section.
According to the invention, when the construction of the beam with the enlarged cross section meets the column, the newly added top ribs 16 bypass from two sides of the column, so that the problems of construction difficulty and construction quality difficulty caused by directly implanting the newly added top ribs 16 into the column are avoided, and the construction efficiency and quality are effectively ensured; meanwhile, the phenomenon that the whole floor slabs in the width of the enlarged cross section of the two sides of the beam top are completely chiseled in the prior art is changed, the two sides of the beam top and the partial floor slabs on the beam top are only chiseled, the beam top steel bars 8 are constructed in the area without chiseling the floor slabs, newly-added top steel bars 16 are constructed in the area with chiseling the floor slabs, the enlarged cross section of the whole original beam 2 along the length direction is completed by connecting the newly-added top steel bars 16 with the beam top steel bars 8, the floor slabs are only chiseled in the partial area of the end part of the original beam 2, the chiseling operation of the floor slabs and the arrangement of temporary supports in the construction process are greatly reduced while the stress effect of the original beam with the enlarged cross section is ensured, the steel bar planting operation is greatly reduced, the construction period is greatly shortened, the economic benefit is improved, the overall construction performance is improved, the restriction of the site environment is smaller, and the construction applicability is further ensured.
Example 2
A structure adopting the construction method for enlarging the section of the beam comprises the walking grooves formed in two sides of the top of an original beam 2, the length of each walking groove is not less than one fourth of the net span value of the original beam 2, the width of each walking groove, namely the distance between each walking groove and the side edge of the original beam 2 is +10cm of the width of the enlarged section of the beam, and the increase of floor slab chiseling operation caused by the overlarge width is avoided, so that the cost is increased, and the construction time is shortened; the situation that the width is too small and is not beneficial to the trend of newly adding the top rib 16, and the whole bearing capacity performance is influenced is avoided. The tip at 2 top surfaces of former roof beam is along the construction groove 3 that 2 length direction of former roof beam seted up, the length of construction groove 3 is not less than the clear fourth of striding the value of former roof beam 2's roof beam, it is provided with newly-increased top muscle 16 along walking groove length direction to walk the inslot, it is fixed that the one end that newly-increased top muscle 16 is close to former post 1 is walked around after former post 1, and newly-increased top muscle 16 passes through roof beam top stirrup 7 with the reinforcing bar in the former roof beam 2 fixed, 2 sides in former roof beam that do not chisel the groove set up roof beam reinforcing bar 8, be connected roof beam reinforcing bar 8 with newly-increased top muscle 16 simultaneously.
The reinforcing structure provided by the invention has the advantages that the whole structure is simple, the construction efficiency is high, the reinforcing structure does not need to be subjected to bar planting operation while the stress effect of the original beam with the section needing to be increased is met, the construction efficiency is high, the reinforcing structure is not easily influenced by the distribution of steel bars in the original beam 2 and the original column 1 in the field environment, the construction difficulty is greatly reduced, the chiseling operation of a floor slab is reduced, the arrangement of field temporary supports is reduced, the cost is saved, the construction efficiency is greatly improved, and the whole universality is high. And the reinforcing structure and the construction method are applied to the reinforcing design of a certain workshop structure of Shenzhen, so that the floor slab chiseling amount and the arrangement of temporary supports are reduced by at least 50%, the construction period is greatly shortened, and the economic benefit is improved.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A construction method for reinforcing a variable cross section of a beam is characterized by comprising the following steps: the method comprises the following steps:
s1: chiseling floor slabs on two sides of the top of the original beam (2) to form a walking groove, wherein the length direction of the walking groove is consistent with the length direction of the original beam (2), and the length of the walking groove is not less than one fourth of the beam clear span value of the original beam (2);
s2: chiseling a floor slab along the length direction of the original beam (2) by taking the end part of the top surface of the original beam (2) as a starting point, chiseling a groove on the top surface of the original beam (2) to form a construction groove (3), wherein the length of the construction groove (3) is not less than one fourth of the net span value of the original beam (2); meanwhile, the slab top steel bars (5) of the chiseled floor slab are kept disconnected, and the slab bottom steel bars (6) of the chiseled floor slab are kept still;
s3: newly added top ribs (16) are constructed in the walking grooves along the length direction of the walking grooves, when the newly added top ribs (16) meet the original column (1), the newly added top ribs (16) are respectively wound around the original column (1), and then the newly added top ribs (16) are fixed; constructing beam top steel bars (8) on the side edges of the original beams (2) without chiseling grooves, and simultaneously connecting the beam top steel bars (8) with newly added top steel bars (16);
s4: constructing a plurality of beam top stirrups (7) in the construction groove (3), and binding the newly-added top stirrups (16) with the steel bars in the original beam (2) by the beam top stirrups (7);
s5: and after the binding is finished, re-welding the plate top steel bars (5) of the chiseled floor slab into a whole, and then pouring concrete or grouting material to finally finish the construction of the beam enlarged section.
2. The construction method for reinforcing the variable cross section of the beam as claimed in claim 1, wherein: in the step S3, constructing erection steel bars (14) used for respectively positioning two newly-added top ribs (16) in the walking groove (3), and binding the erection steel bars (14) and the newly-added top ribs (16) through beam top stirrups (7).
3. The construction method for reinforcing the variable cross section of the beam as claimed in claim 2, wherein: the number of the beam top stirrups (7) is not less than six.
4. The construction method for reinforcing the variable cross section of the beam as claimed in claim 1, wherein: in step S4, a plurality of additional steel bars are further constructed between the newly added top bars (16) on both sides of the original beam (2), and the additional steel bars are connected with the newly added top bars (16).
5. The construction method for reinforcing the variable cross section of the beam as claimed in claim 1, wherein: in step S5, the method further comprises the step of constructing beam bottom steel bars (15) at the bottom of the original beam (2), wherein the beam bottom steel bars (15) are fixed with the original column (1) in a chemical bar planting (13) mode, and the beam bottom steel bars (15) and the newly added top steel bars (16) are bound through the newly added stirrups (12).
6. A construction method using the variable cross-section reinforcement of the girder according to any one of claims 1 to 5, wherein: the beam top reinforcement fixing device comprises a walking groove which is formed in two sides of the top of an original beam (2), wherein the length of the walking groove is not less than one fourth of the beam clear span value of the original beam (2), a construction groove (3) which is formed in the end portion of the top surface of the original beam (2) along the length direction of the original beam (2), the length of the construction groove (3) is not less than one fourth of the beam clear span value of the original beam (2), a newly-added top reinforcement (16) is arranged in the walking groove along the length direction of the walking groove, one end, close to an original column (1), of the newly-added top reinforcement (16) is fixed after bypassing the original column (1), the newly-added top reinforcement (16) and a reinforcement in the original beam (2) are fixed through a beam top stirrup (7), a beam top reinforcement (8) is arranged on the side edge of the original beam (2) without chiseling grooves, and the beam top reinforcement (8) is connected with the newly-added top reinforcement (16).
7. A construction of beam of enlarged cross section as claimed in claim 6, wherein: the distance between the walking groove and the side edge of the original beam (2) is +10cm of the width of the beam plus the required large section.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1162266A (en) * | 1997-08-18 | 1999-03-05 | Takenaka Komuten Co Ltd | Aseismatic reinforcing method of existing building |
| JP2009257039A (en) * | 2008-04-21 | 2009-11-05 | Takenaka Komuten Co Ltd | Aseismatic reinforcing method and aseismatic reinforcing structure for existing building |
| JP2014015791A (en) * | 2012-07-10 | 2014-01-30 | Takenaka Komuten Co Ltd | Structure for reinforcing perforated beam |
| CN107269016A (en) * | 2017-05-16 | 2017-10-20 | 广东省建筑科学研究院集团股份有限公司 | The novel joint that a kind of existing reinforced concrete post is connected with newly-increased reinforced beam |
| CN208202643U (en) * | 2018-01-31 | 2018-12-07 | 江苏意统加固行工程有限公司 | One kind adding concrete beam strengthening floor construction |
| CN109914842A (en) * | 2017-12-12 | 2019-06-21 | 中冶建筑研究总院（上海）有限公司 | Concrete floor structure with secondary beam and reinforcement method thereof |
| CN110878641A (en) * | 2019-12-10 | 2020-03-13 | 赵枫 | Reinforcing structure adopting superimposed hollow floor slab grid system and new construction method |
| CN211974448U (en) * | 2020-03-16 | 2020-11-20 | 广东中森建设工程有限公司 | Shotcrete combined with CFRP reinforcement to increase beam section structure |
| CN214835039U (en) * | 2021-06-04 | 2021-11-23 | 北京城建六建设集团有限公司 | Beam structure changed from shear wall |
| CN217151371U (en) * | 2022-02-21 | 2022-08-09 | 央固工程科技（上海）有限公司 | Structure for reinforcing variable cross section of beam |
-
2022
- 2022-02-21 CN CN202210156743.2A patent/CN114293809B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1162266A (en) * | 1997-08-18 | 1999-03-05 | Takenaka Komuten Co Ltd | Aseismatic reinforcing method of existing building |
| JP2009257039A (en) * | 2008-04-21 | 2009-11-05 | Takenaka Komuten Co Ltd | Aseismatic reinforcing method and aseismatic reinforcing structure for existing building |
| JP2014015791A (en) * | 2012-07-10 | 2014-01-30 | Takenaka Komuten Co Ltd | Structure for reinforcing perforated beam |
| CN107269016A (en) * | 2017-05-16 | 2017-10-20 | 广东省建筑科学研究院集团股份有限公司 | The novel joint that a kind of existing reinforced concrete post is connected with newly-increased reinforced beam |
| CN109914842A (en) * | 2017-12-12 | 2019-06-21 | 中冶建筑研究总院（上海）有限公司 | Concrete floor structure with secondary beam and reinforcement method thereof |
| CN208202643U (en) * | 2018-01-31 | 2018-12-07 | 江苏意统加固行工程有限公司 | One kind adding concrete beam strengthening floor construction |
| CN110878641A (en) * | 2019-12-10 | 2020-03-13 | 赵枫 | Reinforcing structure adopting superimposed hollow floor slab grid system and new construction method |
| CN211974448U (en) * | 2020-03-16 | 2020-11-20 | 广东中森建设工程有限公司 | Shotcrete combined with CFRP reinforcement to increase beam section structure |
| CN214835039U (en) * | 2021-06-04 | 2021-11-23 | 北京城建六建设集团有限公司 | Beam structure changed from shear wall |
| CN217151371U (en) * | 2022-02-21 | 2022-08-09 | 央固工程科技（上海）有限公司 | Structure for reinforcing variable cross section of beam |
Non-Patent Citations (4)
| Title |
|---|
| TOMOMI HISAO;TAKESHI FUKUHARA;YASUYOSHI MIYAUCHI;KATSUNOBU YADORI: "SEISMIC REINFORCEMENT OF STEEL STRUCTURE BY ADHESIVE METHOD", vol. 25, no. 59, 31 December 2019 (2019-12-31) * |
| 杜镔;丁作常;陈冠桦;唐志: "既有桁式组合拱桥桥面板置换加固方案可行性分析", 公路交通科技(应用技术版), no. 011, 31 December 2009 (2009-12-31) * |
| 杨玉金;: "增大截面法加固钢筋混凝土梁常见质量问题", 建筑安全, no. 05, 5 May 2015 (2015-05-05) * |
| 湛楠;吴殿昌;熊梦林;肖博文;: "抽柱加梁技术在框架结构加固改造中的设计与应用", 施工技术, no. 11, 10 June 2018 (2018-06-10) * |
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