阅读说明：本技术 一种简支跨转连续跨钢筋桁架楼承板施工方法 (Construction method for simply-supported span-rotating continuous span steel bar truss floor bearing plate ) 是由 吴智 吕基平 李晓光 曾喜安 宁志强 郭朋鑫 陈根 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种简支跨转连续跨钢筋桁架楼承板施工方法,将相邻简支跨楼承板所有桁架主筋端部的竖向加强钢筋通过短钢筋连接,板端竖向加强筋与钢梁焊接。本发明解决了超重钢筋桁架楼承板采用人工搬运施工难以就位难题,解决了超长钢筋桁架楼承板简支跨跨中下挠难题,解决楼板在混凝土梁支座处板面开裂难题。适用于大空间超高大跨非标准件钢筋桁架楼承板混凝土结构工程。(The invention discloses a construction method of a simply supported span-rotating continuous span steel bar truss floor bearing plate, wherein vertical reinforcing steel bars at the end parts of main steel bars of all trusses of adjacent simply supported span floor bearing plates are connected through short steel bars, and vertical reinforcing steel bars at the plate ends are welded with steel beams. The invention solves the problem that the overweight steel bar truss floor support plate is difficult to be in place by manual carrying construction, solves the problem that the overlong steel bar truss floor support plate is simply supported across the span and is downwarped, and solves the problem that the plate surface of the floor slab is cracked at the concrete beam support. The method is suitable for large-space super-high-span non-standard part steel bar truss floor bearing plate concrete structural engineering.)

1. A construction method for simply supporting and continuously rotating steel bar truss floor bearing plates is characterized by comprising the following steps: the vertical reinforcing steel bars at the end parts of the main ribs of all trusses of the adjacent simply-supported cross-building bearing plate are connected through the short reinforcing steel bars, and the vertical reinforcing steel bars at the plate ends are welded with the steel beam.

2. The construction method of the simply supported span-rotating continuous span steel bar truss floor bearing plate according to claim 1, characterized in that: the diameter and the material of the short steel bars are the same as those of the upper chord steel bars and the lower chord steel bars of the steel bar truss floor bearing plate, and the adjacent upper chord steel bars and the adjacent lower chord steel bars of the adjacent simply supported cross floor bearing plate are respectively welded through single-side lap joint of the short steel bars.

3. The construction method of the simply supported span-rotating continuous span steel bar truss floor bearing plate according to claim 2, characterized in that: when the short reinforcing steel bars are respectively welded with the upper chord reinforcing steel bars and the lower chord reinforcing steel bars, the lap joint length is 10d, and the height of a welding seam is 5 mm.

4. The construction method of the simply supported span-rotating continuous span steel bar truss floor support plate according to claim 3, characterized in that: the concrete construction steps are as follows:

a. laying steel bar truss floor bearing plates:

before the steel bar truss floor support plate is laid, a reference line when the steel bar truss floor support plate is laid is measured according to the initial position shown in a drawing. Aligning a datum line, installing a first steel bar truss floor bearing plate, and sequentially installing other steel bar truss floor bearing plates, wherein the floor bearing plates are connected in a buckling mode, and joints between adjacent steel bar truss floor bearing plates are connected tightly, so that grout leakage is avoided when concrete is poured, and meanwhile, the directions of the plate arrangement are required to be consistent;

b. the vertical reinforcing rib of board end and girder steel welding:

after all the steel bar truss floor bearing plates are laid, welding plate-end vertical reinforcing ribs of the steel bar truss floor bearing plates with the upper parts of the steel beams, wherein the height of a welding seam is 6 mm;

c. and (3) stud welding and fixing:

welding the stud penetrating through the galvanized steel plate of the steel bar truss floor bearing plate on the steel beam;

d. the short steel bars connect and weld two adjacent simply-supported main bars:

overlapping and welding an upper chord steel bar and a lower chord steel bar of adjacent simply supported floor-spanning bearing plates with a short steel bar;

e. cloth structure plate through long steel bar:

binding the through long steel bars of the structural plate in the direction vertical to the truss and the through long steel bars in the direction parallel to the truss according to the requirements of design drawings, and forming a double-layer bidirectional floor support plate structure by adopting binding and lapping;

f. arranging a support and attaching reinforcing steel bars;

g. checking and accepting.

5. The construction method of a simply supported span-rotating continuous span steel bar truss floor support plate according to claim 4, wherein in the step c, the stud welding root fillets are uniform, and the fillets which are not fused or are less than 360 degrees on the vertical surfaces of the fillets are repaired.

6. The construction method of a simply supported span-rotating continuous span steel bar truss floor bearing plate according to claim 4, wherein in the step f, a bottom rib of the support additional steel bar is placed while the through steel bar in the vertical truss direction and the through steel bar in the parallel truss direction are arranged, the bottom rib of the support additional steel bar is bound with the bottom rib of the through steel bar in the vertical truss direction and the bottom rib of the through steel bar in the parallel truss direction, gluten of the support additional steel bar is arranged after the binding of the through steel bar in the vertical truss direction and the gluten of the through steel bar in the parallel truss direction is finished, and the gluten of the support additional steel bar and the gluten of the through steel bar in the parallel truss direction are arranged at intervals of one.

Technical Field

The invention relates to a construction method of a simply-supported span-rotating continuous span steel bar truss floor bearing plate.

Background

Steel bar truss floor carrier plate combines to use with the steel construction usually, and its bottom plate compromises the cast in situ concrete template usefulness, to some super high long-span spatial structure, often the floor adopts conventional standard steel bar truss floor carrier plate and saves to set up high formwork to avoid the high formwork of construction to produce safe risk.

Each standard type floor bearing plate has the maximum bearing limit span (the maximum simply support spans 4.6 meters, and the continuous span spans 5.2 meters), and the floor bearing plates beyond the maximum bearing span are nonstandard plate blocks, so that the risk of collapse of the floor bearing plates exists during construction. There are two ways to address this risk,

firstly, when the simply supported span of the construction area is larger than the maximum bearing span of the type of the construction area, the span is reduced, the support is erected in the span, and the simply supported span is reduced.

Secondly, the steel bar truss floor bearing plate is designed to be continuously arranged in a spanning mode, so that the floor bearing plate generates bending moment at the position of the continuously spanning support, the deflection of the continuous plate is smaller than that of the simple support plate, and the deformation of the floor bearing plate is small in the construction stage.

The first way erects the support frame and just loses the meaning that truss building carrier plate exempted from the support frame, erects the support body in addition and makes engineering cost increase, and the safety risk increases. The second way, according to striding design cloth truss building carrier plate in succession, nonstandard truss building carrier plate is heavier, needs machinery hoist and mount, and the efficiency of construction is low, and the progress is slow, and the expense is high.

Disclosure of Invention

The construction method of the simply supported span-rotating continuous span steel bar truss floor bearing plate solves the defects of the prior art, ensures the installation operability of the overlong steel bar truss floor bearing plate, and ensures the integral stability under the condition that the lower part of the steel bar truss floor bearing plate is free from support in construction.

In order to solve the technical problem, the construction method of the simply supported span-rotating continuous span steel bar truss floor bearing plate is characterized in that vertical reinforcing steel bars at the end parts of main steel bars of all trusses of adjacent simply supported span floor bearing plates are connected through short steel bars, and vertical reinforcing steel bars at the plate ends are welded with steel beams.

Furthermore, the diameter and the material of the short steel bars are the same as those of the upper chord steel bars and the lower chord steel bars of the steel bar truss floor support plate, and the adjacent upper chord steel bars and the adjacent lower chord steel bars of the adjacent simply-supported cross-floor support plate are respectively welded through single-side lap joint of the short steel bars.

Furthermore, when the short reinforcing steel bars are respectively welded with the upper chord reinforcing steel bars and the lower chord reinforcing steel bars, the lap joint length is 10d, and the height of a welding seam is 5 mm.

Further, the concrete construction steps are as follows:

a. laying steel bar truss floor bearing plates:

before the steel bar truss floor support plate is laid, a reference line when the steel bar truss floor support plate is laid is measured according to the initial position shown in a drawing. Aligning a datum line, installing a first steel bar truss floor bearing plate, and sequentially installing other steel bar truss floor bearing plates, wherein the floor bearing plates are connected in a buckling mode, and joints between adjacent steel bar truss floor bearing plates are connected tightly, so that grout leakage is avoided when concrete is poured, and meanwhile, the directions of the plate arrangement are required to be consistent;

b. the vertical reinforcing rib of board end and girder steel welding:

after all the steel bar truss floor bearing plates are laid, welding plate-end vertical reinforcing ribs of the steel bar truss floor bearing plates with the upper parts of the steel beams, wherein the height of a welding seam is 6 mm;

c. and (3) stud welding and fixing:

welding the stud penetrating through the galvanized steel plate of the steel bar truss floor bearing plate on the steel beam;

d. the short steel bars connect and weld two adjacent simply-supported main bars:

overlapping and welding an upper chord steel bar and a lower chord steel bar of adjacent simply supported floor-spanning bearing plates with a short steel bar;

e. cloth structure plate through long steel bar:

binding the through long steel bars of the structural plate in the direction vertical to the truss and the through long steel bars in the direction parallel to the truss according to the requirements of design drawings, and forming a double-layer bidirectional floor support plate structure by adopting binding and lapping;

f. arranging a support and attaching reinforcing steel bars;

g. checking and accepting.

Furthermore, in the step c, welding feet at the welding root of the stud nail are uniform, and the welding feet which are not fused locally or are less than 360 degrees on the vertical surface of the welding feet are repaired; after the stud welding is finished, a bending test is carried out, and the welding seam and the heat affected zone can not have visible cracks.

Further, in the step f, when the through long steel bars in the vertical truss direction and the through long steel bars in the parallel truss direction are arranged, the bottom ribs 10 of the additional steel bars of the support are placed, the bottom ribs 10 of the additional steel bars of the support are bound with the bottom ribs of the through long steel bars in the vertical truss direction 11 and the bottom ribs of the through long steel bars in the parallel truss direction 12, the gluten of the additional steel bars of the support is arranged after the gluten binding of the through long steel bars in the vertical truss direction 11 and the gluten binding of the through long steel bars in the parallel truss direction 12 is completed, and the gluten of the additional steel bars of the support is arranged at intervals of one with the gluten of the through.

According to the invention, adjacent simply-supported spans are welded and connected by adopting the short steel bars to form an integral continuous span, the resistance to the negative bending moment of the support is enhanced by the short steel bars, the problem of plate surface cracking caused by the negative bending moment at the support is solved, the installation operability and high efficiency of workers of the overlong steel bar truss floor support plate can be ensured, the safety of operators can be ensured when the construction load is loaded on the lower part of the steel bar truss floor support plate under the condition of no support at the lower part of the steel bar truss floor support plate in construction, the mid-span deflection of the steel bar truss floor support plate and the cracking at the junction of the beam plate can be effectively controlled, the integral.

In conclusion, the invention solves the problem that the overweight steel bar truss floor support plate is difficult to be in place during manual carrying construction, solves the problem that the overlong steel bar truss floor support plate is simply supported, spans and deflects downwards, and solves the problem that the plate surface of the floor slab cracks at the concrete beam support. The method is suitable for large-space super-high-span non-standard part steel bar truss floor bearing plate concrete structural engineering.

Drawings

Fig. 1 is a schematic view of a conventional construction.

Fig. 2 is a schematic cross-sectional view of the prior art.

FIG. 3 is a schematic view of the construction of the present invention.

Fig. 4 is a schematic cross-sectional view of the present invention.

Fig. 5 is an elevation view showing the connection between the steel bar truss floor deck and the steel beam according to the present invention.

Fig. 6 is a schematic view of the overall structure of the present invention.

FIG. 7 is a flow chart of the construction of the present invention.

In the attached drawings, 1, galvanized steel sheets; 2. a lower chord steel bar; 3. web member reinforcing steel bars; 4. upper chord steel bars; 5. short reinforcing steel bars; 6. a vertical reinforcing rib at the plate end; 7. a stud; 8. reinforcing bar gluten is added to the support; 9. a steel beam; 10. the support is added with a reinforcing steel bar bottom rib; 11. a steel bar is vertically extended in the direction of the truss; 12. and the steel bars are parallel to the direction of the truss and are long.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

Referring to fig. 1 to 7, the invention provides a construction method of a simply supported span-rotating continuous span steel bar truss floor support plate, which is characterized in that main bars of adjacent simply supported span steel bar truss floor support plates are welded by using short steel bars, so that the adjacent simply supported span steel bar truss floor support plates are converted into the continuous span steel bar truss floor support plates, and the mid-span deflection of the steel bar truss floor support plates is effectively controlled. The safety of construction operation surfaces and operators is effectively guaranteed.

A simple support spanning continuous steel bar truss floor bearing plate comprises a steel bar truss floor bearing plate, a stud 7, a vertical truss direction through long steel bar 11, a parallel truss direction through long steel bar 12, a support additional steel bar gluten 8, a support additional steel bar bottom rib 10 and a short steel bar 5, the steel bar truss floor bearing plate comprises an upper chord steel bar 2, a lower chord steel bar 4, a web member steel bar 3, a plate end vertical reinforcing bar 6 and a galvanized steel plate 1, the diameter of the plate end vertical reinforcing bar 6, the material of the plate end vertical reinforcing bar is the same as that of the upper chord steel bar 4 of the floor bearing plate truss, the height of the plate end vertical reinforcing bar is consistent with the height of the truss, the upper end of the plate end vertical reinforcing bar 6 is welded with the upper chord steel bar, the lower end of the.

The concrete construction steps are as follows:

1. laying steel bar truss floor bearing plates:

before the steel bar truss floor support plate is laid, a reference line when the steel bar truss floor support plate is laid is measured according to the initial position shown in a drawing. And aligning the datum line, installing the first steel bar truss floor bearing plate, and sequentially installing other steel bar truss floor bearing plates. Building carrier plate is connected and is adopted the lock mode, and the seam connection between the adjacent steel bar truss building carrier plate is inseparable, and the thick liquid is not leaked when guaranteeing concreting, and it will be unanimous to pay attention to the row board direction simultaneously.

If the width of the end of the span is less than 600mm, the galvanized steel sheet 1 of the steel bar truss floor support plate can be cut along the length direction of the steel bar truss, at least one or two steel bar trusses are arranged on the galvanized steel sheet 1 after cutting, the steel bar truss cannot be cut, and the galvanized steel sheet 1 is prevented from being separated from the web member steel bars 3, as shown in figure 1.

The steel bar truss floor carrier plate is perpendicular to the steel beam, and the lap length of the plate end part on the steel beam 9 is not less than 100 mm.

2. The vertical reinforcing rib of board end and girder steel welding:

treat that all steel bar truss building carrier plates 1 lay the back that finishes, use the electric welding to weld the vertical strengthening rib 6 of board end of steel bar truss building carrier plate in girder steel 9 upper portions, see fig. 5, steel bar truss building carrier plate passes power to girder steel 9 on like this, reinforcing steel bar truss rigidity, the truss building carrier plate of temporary fixation, and the welding seam height is 6 mm.

3. And (3) stud welding and fixing:

referring to fig. 1 and 2, the studs 7 penetrate through the steel bar truss floor bearing plate 1 and are welded on the steel beams 9; welding feet at the welding root of the stud 7 are uniform, and the welding feet which are not fused or less than 360 degrees on the vertical surfaces of the welding feet are repaired; after the stud 7 is welded, the bending test is carried out, and the welding seam and the heat affected zone can not have visible cracks.

4. The short steel bars connect and weld two adjacent simply-supported main bars:

referring to fig. 3 and 4, after the studs 7 of the floor bearing plate of the steel bar truss are welded and fixed, the upper chord steel bars 4 and the lower chord steel bars 2 of the adjacent simply supported cross floor bearing plate are welded by using the short steel bars 5 which have the same diameter and material quality as the upper chord steel bars 4 and the lower chord steel bars 2, the length of the lap welding is 10d, and the height of the welding seam is 5 mm. The simply supported span floor support plates are connected to form a continuous span integral plate, so that the support generates bending moment to enhance the stress of the floor support plates, and the span deflection deformation is small.

5. Cloth structure plate through long steel bar:

after the steel bar truss floor bearing plate is laid in a certain area, after the steel bar truss floor bearing plate is connected and fixed, the steel bar truss floor bearing plate starts to be bound with the steel bar 11 which is perpendicular to the truss direction and the steel bar 12 which is parallel to the truss direction according to the design drawing requirements, binding and lapping are adopted, and a double-layer bidirectional floor bearing plate structure is formed to prevent lateral instability of the steel bar truss.

6. Adding steel bars to the cloth plate support:

referring to fig. 6, when the through long steel bars 11 in the vertical truss direction and the through long steel bars 12 in the parallel truss direction are arranged, bottom bars 10 of the additional steel bars of the support are placed and bound with the bottom bars of the through long steel bars 11 in the vertical truss direction and the bottom bars of the through long steel bars 12 in the parallel truss direction, gluten 8 of the additional steel bars of the support is arranged after the gluten binding of the through long steel bars 11 in the vertical truss direction and the gluten binding of the through long steel bars 12 in the parallel truss direction is completed, and the gluten 8 of the additional steel bars of the support and the gluten binding of the through long steel bars 12 in the parallel truss direction. The steel bar truss floor support plates on the two sides of the support are guaranteed to form an integral stress, and plate cracking caused by hogging moment at the position of the rear support after the truss floor support plates are continuously spanned from simply spanned span to simply spanned span is prevented.

7. Inspection acceptance

Form as shown in fig. 6 after all floor reinforcing bars and preparation reinforcement accomplish, will construct the accessory to inspect to each, position, reinforcement mode, fastening mode etc. are examined and are accepted, see whether correct steel bar truss floor bearing plate is accepted and carry out floor concrete placement again, when pouring concrete, must not directly aim at the floor bearing plate and strike, should lay support department and then open to all around.

The above preferred embodiments are provided to further illustrate the objects, technical solutions and advantages of the present invention, it should be understood that the above preferred embodiments are only illustrative and not restrictive, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.