T-beam steel skeleton based on spiral stirrups and machining method

Abstract

The invention relates to the technical field of steel frameworks, in particular to a T-beam steel framework based on spiral stirrups and a machining method.The T-beam steel framework comprises top plate transverse steel bars and web stirrups, a plurality of sets of top plate longitudinal steel bars are arranged in the top plate transverse steel bars, and the top plate longitudinal steel bars are matched with the top plate transverse steel bars to form a top plate transverse part; a plurality of sets of web longitudinal steel bars are arranged on the two sides of the interior of the web stirrup correspondingly, the web stirrup is matched with the web longitudinal steel bars to form a top plate longitudinal part, and the top plate transverse part is embedded in the upper portion of the top plate longitudinal part to form a T-beam steel framework. The mode that the top plate transverse steel bars and the web stirrups are formed through continuous rotating and bending can guarantee the stability of the forming process, and the mechanical forming rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of steel skeletons, and particularly relates to a T-beam steel skeleton based on spiral stirrups and a processing method thereof. Background Art

[0002] The simply supported T-beam with a steel skeleton is a structural type adopted for medium and small span bridges. The main materials are steel bars and concrete. The production process of precast beams usually includes steps such as steel bar processing, assembly and welding, concrete pouring, and prestress tensioning. Among them, the processing and assembly of steel bars are key links, which directly affect the quality and efficiency of precast beams. In traditional construction methods, these works are mainly completed manually, which is time-consuming and laborious, and the quality is difficult to guarantee;

[0003] However, due to the complexity of the T-beam structure, the shapes and sizes of steel bars are various, and the machine cannot meet the requirements of all steel bar processing, which limits the full automation rate of steel bar skeleton production. Therefore, a T-beam steel skeleton based on spiral stirrups and a processing method thereof are proposed. Summary of the Invention

[0004] In order to solve the above technical problems existing in the prior art, the present invention provides a T-beam steel skeleton based on spiral stirrups and a processing method thereof.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A T-beam steel skeleton based on spiral stirrups includes transverse top steel bars and web stirrups. A number of groups of longitudinal top steel bars are arranged inside the transverse top steel bars. The longitudinal top steel bars cooperate with the transverse top steel bars to form a transverse top part. On both sides inside the web stirrups, a number of groups of longitudinal web steel bars are respectively arranged. The web stirrups cooperate with the longitudinal web steel bars to form a longitudinal web part. The transverse top part is nested above the longitudinal web part to form a T-beam steel skeleton.

[0006] Preferably, the transverse top steel bars are composed of a number of groups of transverse top steel bar segments arranged at equal intervals. The end of one group of transverse top steel bar segments is connected to the end of another group of transverse top steel bar segments. A number of groups of connected transverse top steel bar segments are combined to form the transverse top steel bars.

[0007] Preferably, the cross-section of the transverse top steel bars is rectangular. A rectangular chamber is formed inside the transverse top steel bars. A number of groups of longitudinal top steel bars are respectively arranged on the upper and lower sides of the rectangular chamber inside the transverse top steel bars. A triangular connecting part is formed downward at the rectangular bottom of the transverse top steel bars.

[0008] Preferably, the web stirrups are composed of a number of groups of web stirrup segments arranged at equal intervals. The end of one group of web stirrup segments is connected to the end of another group of web stirrup segments. A number of groups of connected web stirrup segments are combined to form the web stirrups.

[0009] Preferably, the arrangement spacing of the web stirrup segments is the same as that of the transverse top reinforcement segments, and the web stirrup segments and the transverse top reinforcement segments are arranged in a staggered manner.

[0010] Preferably, several groups of bottom web reinforcement bars are arranged at the inner bottom end of the web stirrups, and the bottom web reinforcement bars are laid at equal intervals at the inner bottom end of the web stirrups.

[0011] Preferably, a connection channel is formed in the overlapping area between the web stirrup segments and the transverse top reinforcement segments. Several groups of top and web cross reinforcement bars are arranged in the connection channel, and the web stirrup segments are connected to the transverse top reinforcement segments through the top and web cross reinforcement bars.

[0012] The processing method of the T-beam steel skeleton based on spiral stirrups includes the following steps:

[0013] Step S1, according to the requirements of the stirrup specification, the stirrup reinforcement ratio ρ in the beam sv is not less than 0.11%;

[0014] Step S2, form the calculation formula 1 of the stirrup reinforcement ratio ρ sv : In the calculation formula 1, A sv is the area of a stirrup at one spacing, b is the width of the beam rib, and s v is the stirrup spacing;

[0015] Step S3, according to the direction of the stirrup arrangement, equivalent the inclined stirrups to the vertical stirrups to form the equivalent relationship formula 2: where A is the cross-sectional area of the stirrup;

[0016] Step S5, substitute the equivalent relationship formula 2 into the calculation formula 1 to obtain the relationship formula 3:

[0017] Step S6, transform the relationship formula 3 to obtain the relationship formula 4:

[0018] Step S7, substitute the fixed value b and the fixed value h into the relationship formula 4, and calculate the maximum spacing s through the relationship formula 4 v ;

[0019] Step S8, produce the web stirrup segments and the transverse top reinforcement segments with a spiral configuration according to the calculated s v , splice the produced web stirrup segments and then connect them by welding.

[0020] Preferably, in the step S7, the stirrup spacing s v is not greater than 200 mm. For the stirrup spacing s vValues greater than 200 mm are discarded, and 200 mm is directly selected as s v 。

[0021] Preferably, it further includes step S9 of carrying out dynamic reinforcement design of variable-section spiral stirrups. In view of the different force conditions at different positions of the T-beam steel skeleton, a dynamic reinforcement ratio model is introduced:

[0022]

[0023] where ρ sv is the basic reinforcement ratio (ρ sv ≥0.11%), Q(x) is the shear force at position x of the T-beam, Q max is the maximum shear force of the T-beam steel skeleton, and α is the adjustment coefficient with a value range of 0.2 to 0.5;

[0024] At the mid-span position of the T-beam, Q(x) = 0, and at this time ρ sv (x) = ρ sv , taking the basic reinforcement ratio;

[0025] At the support position of the T-beam, the shear force is the largest. At this time, Q(x) = Q max , and at this time ρ sv (x) = ρ sv (1 + α), taking 1.2 to 1.5 times of the basic reinforcement ratio;

[0026] Through this model, the spiral stirrup spacing formula is optimized as:

[0027]

[0028] Combined with the finite element analysis results, the s v (x) curve is dynamically generated. According to the calculated s v (x), the web stirrup segments and top plate transverse reinforcement segments in spiral configuration are produced, and the produced web stirrup segments are spliced and then welded together;

[0029] Step S10, after the welding of the top plate transverse reinforcement segments is completed, the top plate longitudinal reinforcement is inserted into the welded top plate transverse reinforcement segments. After the welding of the web stirrup segments is completed, the web longitudinal reinforcement is inserted into the welded web stirrup segments. The top plate transverse reinforcement segments and the web stirrup segments are aligned and then spliced and welded, and the top plate web cross reinforcement is inserted into the connection between the top plate transverse reinforcement segments and the web stirrup segments and welded.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. The present invention is provided with transverse top plate steel bars and web stirrups. The transverse top plate steel bars are composed of several groups of transverse top plate steel bar segments arranged at equal intervals, and the web stirrups are composed of several groups of web stirrup segments arranged at equal intervals. The method of continuously rotating and bending the transverse top plate steel bars and web stirrups can ensure the stability of the forming process and improve the mechanized forming rate.

[0032] 2. In the present invention, the bottom web bottom layer steel bars of the web stirrups can play a supporting role in the bottom of the web stirrups, thereby strengthening the overall structural strength of the web stirrups and keeping the web stirrups in a complete configuration.

[0033] 3. In the present invention, in view of the different force differences at different positions of the T-beam steel skeleton, a variable-spacing spiral stirrup design is proposed to optimize the local constraint effect by dynamically adjusting the spacing of the spiral stirrup segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0035] Figure 2 is a three-dimensional structural schematic diagram of the transverse top plate steel bars of the present invention;

[0036] Figure 3 is a three-dimensional structural schematic diagram of the transverse top plate steel bar segments of the present invention;

[0037] Figure 4 is a three-dimensional structural schematic diagram of the web stirrup segments of the present invention;

[0038] Figure 5 is a schematic diagram of the combined structure of the web stirrups and the longitudinal web steel bars of the present invention;

[0039] Figure 6 is a schematic diagram of the spacing of the web stirrup segments of the present invention.

[0040] The numbers in the figure represent:

[0041] 1. Transverse top plate steel bars; 11. Transverse top plate steel bar segments; 2. Longitudinal top plate steel bars; 3. Web stirrups; 31. Web stirrup segments; 4. Longitudinal web steel bars; 5. Bottom web layer steel bars; 6. Cross steel bars of the top plate and web. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following further elaborates the present invention in combination with the drawings and embodiments on the above and other technical features and advantages of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them.

[0043] Embodiment:

[0044] Such as Figure 1 - Figure 6As shown in the figure, the present invention provides a T-beam steel skeleton based on spiral stirrups and a processing method, including top plate transverse steel bars 1 and web stirrups 3. Inside the top plate transverse steel bars 1, several groups of top plate longitudinal steel bars 2 are arranged. The top plate longitudinal steel bars 2 cooperate with the top plate transverse steel bars 1 to form a top plate transverse part. On both sides inside the web stirrups 3, several groups of web longitudinal steel bars 4 are respectively arranged. The web stirrups 3 cooperate with the web longitudinal steel bars 4 to form a web longitudinal part. The top plate transverse part is nested above the web longitudinal part to form a steel skeleton.

[0045] The top plate transverse steel bars 1 are composed of several groups of top plate transverse steel bar segments 11 arranged at equal intervals. The end of one group of top plate transverse steel bar segments 11 is connected to the end of another group of top plate transverse steel bar segments 11. Several groups of connected top plate transverse steel bar segments 11 are combined to form the top plate transverse steel bars 1. The top plate transverse steel bars 1 can be formed by continuously bending a group of steel bars according to the configuration of the top plate transverse steel bar segments 11, or can be formed by arranging and welding several groups of top plate transverse steel bar segments 11. The cross-section of the top plate transverse steel bars 1 is rectangular, and a rectangular chamber is formed inside the top plate transverse steel bars 1. Several groups of top plate longitudinal steel bars 2 are respectively arranged on the upper and lower sides of the rectangular chamber inside the top plate transverse steel bars 1. Supported by several groups of top plate longitudinal steel bars 2, the top plate transverse steel bars 1 form a fixed top plate transverse part.

[0046] The web stirrups 3 are composed of several groups of web stirrup segments 31 arranged at equal intervals. The end of one group of web stirrup segments 31 is connected to the end of another group of web stirrup segments 31. Several groups of connected web stirrup segments 31 are combined to form the web stirrups 3. The web stirrups 3 can be formed by continuously bending a group of steel bars according to the configuration of the web stirrup segments 31.

[0047] The arrangement spacing of the web stirrup segments 31 is the same as that of the top plate transverse steel bar segments 11. The web stirrup segments 31 and the top plate transverse steel bar segments 11 are arranged in a staggered manner. The staggered web stirrup segments 31 and the top plate transverse steel bar segments 11 are mutually attached, forming a T-shaped configuration without interfering with each other.

[0048] Several groups of web bottom steel bars 5 are arranged at the inner bottom end of the web stirrups 3. The web bottom steel bars 5 are laid at equal intervals at the inner bottom end of the web stirrups 3. The web bottom steel bars 5 arranged at the bottom of the web stirrups 3 can play a supporting role for the bottom of the web stirrups 3, thereby strengthening the overall structural strength of the web stirrups 3 and keeping the web stirrups 3 in a complete configuration.

[0049] The overlapping area between the web stirrup segment 31 and the top plate transverse reinforcement segment 11 forms a connection channel. Several groups of top plate-web crossing reinforcements 6 are arranged in the connection channel. The web stirrup segment 31 is connected to the top plate transverse reinforcement segment 11 through the top plate-web crossing reinforcements 6. After the top plate transverse reinforcement segment 11 and the web stirrup segment 31 are nested and connected, several groups of top plate-web crossing reinforcements 6 are arranged in the overlapping area in an inserted manner and are connected to the web stirrup segment 31 by mechanical welding first. The top plate-web crossing reinforcements 6 connected to the web stirrup segment 31 provide support for the setting of the top plate transverse reinforcement segment 11. After the setting position of the top plate transverse reinforcement segment 11 relative to the web stirrup segment 31 is adjusted, the top plate transverse reinforcement segment 11 is further connected to the web stirrup segment 31 by the welding method of a welding robot. A triangular connection part is formed by downward molding at the rectangular bottom of the top plate transverse reinforcement 1. The top plate-web crossing reinforcements 6 are inserted into the triangular connection part of the top plate transverse reinforcement 1, and each group of top plate transverse reinforcements 1 is further connected by welding, so as to maintain the stability of the structure;

[0050] Processing method of T-beam steel skeleton based on spiral stirrups:

[0051] According to the requirements of the stirrup specification, the stirrup reinforcement ratio ρ in the beam sv is not less than 0.11%;

[0052] Form the calculation formula 1 of the stirrup reinforcement ratio ρ sv : In calculation formula 1, A sv is the area of a stirrup at a spacing, b is the width of the beam rib, and s v is the stirrup spacing;

[0053] According to the direction of the stirrup setting, the inclined stirrups are equivalent to the stirrups in the vertical direction, and the equivalent relationship formula 2 is formed: where A is the cross-sectional area of the double-leg spiral stirrup;

[0054] Substitute the equivalent relationship formula 2 into the calculation formula 1 to obtain the relationship formula 3:

[0055] Transform the relationship formula 3 to obtain the relationship formula 4:

[0056] Substitute the fixed value b and the fixed value h into the relationship formula 4, and calculate the maximum spacing s through the relationship formula 4 v ;

[0057] According to the calculated s v Produce the web stirrup segments and top plate transverse reinforcement segments with a spiral configuration, and splice and weld the produced web stirrup segments after splicing.

[0058] Calculated s v Stirrup spacing s v Not greater than 200 mm, for the stirrup spacing s v Values greater than 200 mm are discarded, and 200 mm is directly selected as s v .

[0059] Carry out the dynamic reinforcement design of variable-section spiral stirrups. In view of the stress differences at different positions of the T-beam steel skeleton, introduce the dynamic reinforcement ratio model:

[0060]

[0061] Where ρ sv Is the basic reinforcement ratio, (ρ sv ≥0.11%), Q(x) is the shear force at the x position of the T-beam, Q max Is the maximum shear force of the T-beam steel skeleton, α is the adjustment coefficient, and the value range is 0.2 - 0.5;

[0062] At the mid-span position of the T-beam, Q(x) = 0, and at this time ρ sv (x) = ρ sv , take the basic reinforcement ratio;

[0063] At the support position of the T-beam, the shear force is the largest. At this time, Q(x) = Q max , and at this time ρ sv (x) = ρ sv (1 + α), take 1.2 - 1.5 times of the basic reinforcement ratio;

[0064] Through this model, the spiral stirrup spacing formula is optimized:

[0065]

[0066] Dynamically generate the s v (x) curve in combination with the finite element analysis results. According to the calculated s v (x), produce the web stirrup segments and top plate transverse reinforcement segments in a spiral configuration, and splice and weld the produced web stirrup segments;

[0067] After the welding of the top plate transverse reinforcement segments is completed, insert the top plate longitudinal reinforcement into the welded top plate transverse reinforcement segments. After the welding of the web stirrup segments is completed, insert the web longitudinal reinforcement into the welded web stirrup segments. Align the top plate transverse reinforcement segments and the web stirrup segments and splice and weld them. Insert the top plate web cross reinforcement into the connection between the top plate transverse reinforcement segments and the web stirrup segments and weld them.

[0068] The above are only the preferred embodiments of the present invention, which are illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications or even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all of them will fall within the protection scope of the present invention.

Claims

1. A T-beam steel skeleton based on spiral stirrups, characterized in that: It includes top plate transverse steel bars and web stirrups, wherein a plurality of top plate longitudinal steel bars are arranged inside the top plate transverse steel bars, and the top plate longitudinal steel bars cooperate with the top plate transverse steel bars to form a top plate transverse portion, and a plurality of web plate longitudinal steel bars are arranged on both sides of the web stirrups, and the web stirrups cooperate with the web longitudinal steel bars to form a top plate longitudinal portion, and the top plate transverse portion is nested above the top plate longitudinal portion to form a T-beam steel skeleton.

2. A T-beam steel skeleton based on spiral stirrups as claimed in claim 1, characterized in that: The top plate transverse reinforcement is composed of several groups of top plate transverse reinforcement segments arranged at equal intervals, the ends of one group of top plate transverse reinforcement segments are connected to the ends of another group of top plate transverse reinforcement segments, and several groups of connected top plate transverse reinforcement segments are combined to form the top plate transverse reinforcement.

3. A T-beam steel skeleton based on spiral stirrups as claimed in claim 2, characterized in that: The cross-section of the top plate transverse steel bar is rectangular, and a rectangular cavity is formed inside the top plate transverse steel bar. Several groups of top plate longitudinal steel bars are respectively arranged on the upper and lower sides of the rectangular cavity inside the top plate transverse steel bar. A triangular connecting portion is formed downwardly at the bottom of the rectangle of the top plate transverse steel bar.

4. A T-beam steel skeleton based on spiral stirrups as claimed in claim 2, characterized in that: The web stirrups are composed of several groups of web stirrup segments arranged at equal intervals, the ends of one group of web stirrup segments are connected to the ends of another group of web stirrup segments, and several groups of connected web stirrup segments are combined to form web stirrups.

5. A T-beam steel skeleton based on spiral stirrups as claimed in claim 4, characterized in that: The arrangement spacing of the web stirrup segments is the same as the arrangement spacing of the top plate transverse steel bar segments, and the web stirrup segments and the top plate transverse steel bar segments are arranged in a staggered manner.

6. A T-beam steel skeleton based on spiral stirrups as claimed in claim 5, characterized in that: A plurality of groups of web bottom steel bars are arranged at the inner bottom end of the web stirrups, and the web bottom steel bars are laid at equal intervals at the inner bottom end of the web stirrups.

7. A T-beam steel skeleton based on spiral stirrups as claimed in claim 5, characterized in that: The overlapping area of ​​the web stirrup segment and the top plate transverse steel bar segment forms a connecting channel, and a plurality of groups of top plate web cross steel bars are arranged in the connecting channel. The web stirrup segment is connected to the top plate transverse steel bar segment through the top plate web cross steel bars.

8. A method for processing a T-beam steel skeleton based on spiral stirrups according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: According to the stirrup specification requirements, the stirrup reinforcement ratio ρ in the beam sv Not less than 0.11%; Step S2, forming the stirrup reinforcement ratio ρ sv Calculation formula 1: In calculation formula 1, A sv is the area of ​​a spacing stirrup, b is the beam rib width, s v is the stirrup spacing; Step S3, according to the direction of the stirrup setting, the inclined stirrups are equivalent to the stirrups in the vertical direction, forming an equivalent relationship 2: Where A is the cross-sectional area of ​​the stirrup; Step S5, substitute the equivalent relation 2 into the calculation formula 1 to obtain the relation 3: Step S6, transforming equation 3 to obtain equation 4: Step S7, bring the fixed value b and the fixed value h into equation 4, and calculate the maximum spacing s by equation 4 v ; Step S8, based on the calculated s v Spiral web stirrup segments and top plate transverse reinforcement segments are produced, and the produced web stirrup segments are spliced ​​and then welded together.

9. The method for processing a T-beam steel skeleton based on spiral stirrups according to claim 8, characterized in that: In step S7, the stirrup spacing s v Not more than 200mm, for stirrup spacing s v Values ​​greater than 200 mm are discarded, and 200 mm is directly selected as s v .

10. The method for processing a T-beam steel skeleton based on spiral stirrups according to claim 8, characterized in that: The invention also includes step S9, which is to carry out dynamic reinforcement design of variable-section spiral stirrups, and introduce a dynamic reinforcement ratio model according to the stress difference at different positions of the T-beam steel skeleton: where ρ sv is the basic reinforcement ratio, (ρ sv ≥0.11%), Q(x) is the shear force at the x position of the T beam, Q max is the maximum shear force of the T-beam steel skeleton, α is the adjustment coefficient, and its value range is 0.2~0.5; At the mid-span of the T-beam, Q(x) = 0, at which time ρ sv (x) = ρ sv , take the basic reinforcement ratio; At the T-beam support point, the shear force is the largest, at which point Q(x) = Q max , at this time sv (x) = ρ sv (1+α), take 1.2 to 1.5 times of the basic reinforcement ratio; The formula for spiral stirrup spacing is obtained through optimization of the model: Dynamically generate s v (x) curve, according to the calculated s v (x) producing spirally configured web stirrup segments and top plate transverse reinforcement segments, splicing the produced web stirrup segments and then welding them together; Step S10, after the top plate transverse steel bar segment is welded, the top plate longitudinal steel bar is inserted into the welded top plate transverse steel bar segment, after the web stirrup segment is welded, the web longitudinal steel bar is inserted into the welded web stirrup segment, the top plate transverse steel bar segment and the web stirrup segment are aligned and then spliced ​​and welded, the top plate web cross steel bar is inserted into the connection between the top plate transverse steel bar segment and the web stirrup segment and welded.

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