CN108999394B

CN108999394B - Construction process of floor type scaffold rotary cantilever type scaffold

Info

Publication number: CN108999394B
Application number: CN201810922476.9A
Authority: CN
Inventors: 何俨; 杨洋; 杨冰
Original assignee: China Metallurgical Construction Engineering Group Co Ltd
Current assignee: China Metallurgical Construction Engineering Group Co Ltd
Priority date: 2018-08-14
Filing date: 2018-08-14
Publication date: 2021-01-05
Anticipated expiration: 2038-08-14
Also published as: CN108999394A

Abstract

The invention discloses a construction process of a floor type scaffold to an overhanging type scaffold, which comprises the following steps: drawing a structure diagram of the bottom support of the overhanging scaffold; cutting I-shaped steel, and welding a plurality of vertical reinforcing pipes on the I-shaped steel; mounting I-shaped steel; installing and fixing jacks on the corresponding I-shaped steel, and meanwhile, installing a connecting piece on each jack; after the connecting piece is fixedly connected with the vertical rod adjacent to the connecting piece, all the jacks are started simultaneously, so that the bottom of the floor type scaffold is separated from the ground; a plurality of wall connecting cross rods are arranged on the upright rods, and the vertical reinforcing pipes on the I-shaped steel and the upright rods adjacent to the vertical reinforcing pipes are fixed together through hoops; dismantling vertical rods and cross rods of a floor type scaffold below a floor of a bottom plate; and (5) removing the jack and the connecting piece. The construction process of the floor type scaffold to the overhanging type scaffold can quickly convert the floor type scaffold into the overhanging type scaffold, reduce the waiting time of backfilling of several underground layers and accelerate the construction period.

Description

Construction process of floor type scaffold rotary cantilever type scaffold

Technical Field

The invention relates to the field of building construction, in particular to a construction process of a floor type scaffold-to-cantilever type scaffold.

Background

During construction, it is usually necessary to set up scaffolds to assist workers in construction. Specifically, the scaffold mainly includes two structures, one is a floor scaffold, and the other is a cantilever scaffold. Wherein, the pole setting among the floor type scaffold is fixed subaerial, and the horizontal pole is adjacent with the wall. The fixing points of the overhanging scaffold are on the floor, beam or wall of each floor and are in a suspended state.

When a high-rise building is constructed, a floor scaffold is generally required to be erected on a base layer of an underground garage, and generally, the erected height is higher than the ground and is raised by several floors above the ground. When the structure is implemented to positive and negative zero (1 layer), the outer wall of the garage must be backfilled, and the conventional construction is to dismantle the ground falling frame and re-set up the cantilever frame. Thus not only influencing the speed of the dismantling, but also wasting a plurality of layers of external frames which are already erected on the upper part. Meanwhile, for some projects, in order to accelerate progress and advance outdoor projects, scaffolds need to be erected within a short time, the amount of the backfilled garage outer walls is large, the scaffolds can be constructed after several days, and the construction period is seriously affected. Based on the reasons, the applicant considers that the scaffold is erected while the garage outer wall is backfilled, meanwhile, supports of cantilever beam scaffolds are erected on a bottom floor slab, meanwhile, scaffold upright rods and cross rods of several underground layers are dismantled, the floor type scaffold is converted into the cantilever type scaffold, the erecting time and the engineering quantity of the scaffold are reduced, and the construction period is shortened. For the operation method, no construction unit adopts the technical means at present.

Disclosure of Invention

Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: if provide one kind can be fast with the floor type scaffold conversion to the formula scaffold that encorbelments to make the fixed firm construction process of a floor type scaffold frame change the formula scaffold frame that encorbelments.

In order to solve the technical problems, the invention adopts the following technical scheme:

the construction process of the floor type scaffold-to-cantilever type scaffold is characterized by comprising the following steps of: s1, drawing a structure diagram of the bottom support of the overhanging scaffold according to the span of the floor scaffold; s2, according to the design requirements of I-shaped steel in the structure diagram of the cantilever scaffold bottom support in S1, I-shaped steel with corresponding quantity and length is cut out, a plurality of vertical reinforcing pipes are vertically welded on one web plate of the I-shaped steel according to the space between the vertical rods in the floor scaffold, and the space and the quantity of the vertical reinforcing pipes correspond to the space and the quantity of the vertical rods in the floor scaffold; s3, mounting I-shaped steel according to the structure diagram of the cantilever scaffold bottom support in the S1, and placing one end with the vertical reinforcing pipe outwards when mounting; s4, calculating the number of jacks according to the floor height and span of the floor scaffold, installing and fixing the jacks on corresponding I-beams, and meanwhile, installing a connecting piece capable of rotating circumferentially by taking the jack as a center on each jack; s5, fixedly connecting the connecting piece with the adjacent floor type scaffold upright post, and then starting all the jacks simultaneously to separate the bottom of the floor type scaffold from the ground in a suspended state; s6, mounting a plurality of wall connecting cross rods on the upright rods from bottom to top, and fixing the vertical reinforcing pipes on the I-shaped steel and the upright rods adjacent to the vertical reinforcing pipes together through hoops; s7, dismantling the vertical rods and the cross rods of the floor type scaffold below the bottom floor; and S8, removing the jack and the connecting piece. Therefore, the I-steel is fixed on the bottom floor slab, the jacking piece is fixedly installed on the I-steel and fixedly connected with the scaffold upright rod through the connecting piece, when the cantilever type scaffold is used, the scaffold below the bottom floor slab can be detached after the scaffold is jacked to a certain height through the jacking piece, so that the cantilever type scaffold is obtained, the conversion mode is simple and convenient, the outer wall backfill does not need to be waited, the installation and fixation of the cantilever type scaffold can be realized, and the construction period can be shortened.

Furthermore, before the I-steel is installed, a steel bar scanner is needed to scan the arrangement form of the steel bars in the bottom floor, the positions of the steel bars are marked on the floor, and then the arrangement lines of all the I-steel are marked on the bottom floor according to the installation positions of the I-steel in the cantilever scaffold bottom support structure diagram and the positions of the steel bars. Therefore, after the I-steel arrangement line is marked on the bottom floor slab, the I-steel can be ensured not to prop against the vertical rod of the scaffold during installation and is close to the vertical rod of the scaffold. And the marked plate rib position can avoid the contact of a drill bit and the plate rib to damage the plate rib when drilling in the I-shaped steel arrangement line. Simultaneously, mark behind the slab muscle position, can also ensure that the later stage is used for the intensity requirement standard of the fastener mounted position of fixed I-steel, avoid the damage of floor.

Furthermore, two arrangement lines are arranged on each I-shaped steel, and the distance between the two arrangement lines is the width of the web plate of the I-shaped steel; at least two steel bars are wrapped in the I-steel arrangement line of each I-steel. Therefore, the mounting position corresponding to each I-steel can be wrapped with two or more steel bars, so that the strength requirement of the mounting position of the fastener for fixing the I-steel at the later stage is up to standard, and the tensile force of the fastener and the pressure of the I-steel are shared.

Further, the specific installation steps of the I-steel are as follows: s1, determining the fixing positions of the I-beams on the bottom floor slab, drilling mounting holes at the fixing positions and on the outer sides of the I-beam arrangement lines, wherein two mounting holes are correspondingly arranged at each fixing position, and the distance between each mounting hole and a steel bar is preferably controlled within 10 mm; s2, after the U-shaped bolt is opened upwards and penetrates through the mounting hole upwards from the bottom of the bottom floor slab, a pressing plate is sleeved at the upper end of the U-shaped bolt and is arranged on the I-shaped steel, and then the pressing plate is tightly abutted against the I-shaped steel by a nut, so that the I-shaped steel is fixed on the bottom floor slab. The method mainly aims at the situation that a fastening device for fixing the I-shaped steel is not pre-buried in a bottom floor slab, so that the I-shaped steel is fixed after the hole is drilled on site and the U-shaped bolt is installed. This mounting means is easy and simple to handle, and the installation effectiveness is high, and simultaneously, it is fixed firm, later stage also convenient to detach.

Furthermore, when the U-shaped bolt is installed, a base plate needs to be sleeved at the lower end of the U-shaped bolt, and the base plate is arranged below the bottom floor. Therefore, the backing plate can not only share part of the tensile force borne by the U-shaped bolt and share part of the tensile force on the bottom floor slab, but also prevent the lower end of the U-shaped bolt from directly contacting with the bottom floor slab to cause abrasion to the floor.

Further, before the I-steel is installed, fixing holes for installing the jacks are drilled in the I-steel according to the installation positions and the intervals of the jacks in the drawing structure diagram of the cantilever scaffold bottom support, and the fixing holes are arranged on a web plate of the I-steel with a vertical reinforcing pipe. Therefore, after the fixing hole is drilled in the I-steel in advance, the mounting position of the jack can be determined quickly, and meanwhile, the mounting time of the jack can be saved.

Furthermore, the connecting piece is including installing the connecting rod in the jack upper end, the lower extreme of connecting rod is rotationally installed in the jack upper end, and the upper end of connecting rod is transversely bent, and the end fixed mounting that should bend the section has a staple bolt that is used for the pole setting on the centre gripping console mode scaffold. Like this, through behind the end at the connecting piece sets up the staple bolt, can be fast with the pole setting in connecting piece and the scaffold frame together fixed.

Further, in S5, before the lifting jack is started, the position above the vertical rod of the floor scaffold should be reinforced by a small cross rod, and the small cross rod should be 200mm higher than the vertical rod reinforcing position of the floor scaffold. Like this, can stabilize scaffold after setting up little horizontal pole, increase its bearing capacity.

Furthermore, after the floor type scaffold is converted into the overhanging type scaffold, before the floor type scaffold below a bottom floor is dismantled, settlement monitoring points are set for the floor type scaffold, monitoring is carried out through a theodolite, and settlement is strictly controlled within 5 mm. Through the control of the settlement observation point, the possible deformation or settlement of the frame body is further observed and controlled, and adverse consequences caused by deformation and overall settlement in the conversion process of the frame body are avoided.

Compared with the prior art, the construction process of the floor type scaffold-to-cantilever scaffold has the following advantages:

1. the I-steel is fixed on the bottom floor slab, the jacking piece is fixedly installed on the I-steel and fixedly connected with the scaffold upright rod through the connecting piece, and when the cantilever type scaffold is used, the scaffold below the bottom floor slab can be detached after the scaffold is jacked to a certain height through the jacking piece, so that the cantilever type scaffold is obtained.

2. Utilize current partial console mode scaffold frame as the bottom layer of later stage overhanging type scaffold frame, reducible set up the cycle of setting up of overhanging type scaffold frame, simultaneously, can also save the time and the work load of dismantling console mode scaffold frame to and save the work load of setting up of overhanging type scaffold frame.

Drawings

FIG. 1 is a schematic view of an installation structure of a floor scaffold converted into an overhanging scaffold in an embodiment;

fig. 2 is an enlarged view showing a coupling structure of the top stay, the coupling member and the middle rod of the scaffold in the embodiment;

FIG. 3 is an enlarged schematic view of a connection structure of I-shaped steel and a bottom floor slab in the embodiment;

FIG. 4 is an enlarged schematic view of a partial structure of an I-shaped steel in the embodiment.

In the figure: the structure comprises a bottom floor 1, U-shaped bolts 2, a pressure plate 3, a base plate 4, I-shaped steel 5, fixing holes 51, a jack 6, a connecting piece 7, vertical reinforcing pipes 8 and upright rods 9.

Detailed Description

The invention is further illustrated with reference to the following figures and examples.

Example (b):

the construction process of the floor scaffold-to-cantilever scaffold provided by the embodiment comprises the following steps: s1, drawing a structure diagram of the bottom support of the overhanging scaffold according to the span of the floor scaffold; s2, according to the design requirements of I-shaped steel 5 in the structure diagram of the cantilever scaffold bottom support in S1, cutting I-shaped steel 5 with corresponding quantity and length, and welding a plurality of vertical reinforcing pipes 8 on one web plate of the I-shaped steel 5 according to the space between the vertical rods 9 in the floor scaffold, wherein the space and the quantity of the vertical reinforcing pipes 8 correspond to the space and the quantity of the vertical rods 9 in the floor scaffold (as shown in FIG. 4); s3, installing the I-steel 5 according to the structure diagram of the cantilever scaffold bottom support in the S1, and placing one end with the vertical reinforcing pipe 8 outwards when installing; s4, calculating the number of jacks 6 according to the floor height and span of the floor scaffold, installing and fixing the jacks 6 on the corresponding i-beams 5, and meanwhile, installing a connector 7 (shown in fig. 1 and 2) capable of rotating circumferentially around the jack 6 on each jack 6; s5, fixedly connecting the connecting piece 7 with the adjacent floor type scaffold upright stanchion 9, and then simultaneously starting all the jacks 6 to separate the bottom of the floor type scaffold from the ground in a suspended state; s6, mounting a plurality of wall connecting cross rods on the upright rods 9 from bottom to top, and fixing the I-shaped steel upper vertical reinforcing pipe 8 and the upright rods 9 adjacent to the I-shaped steel upper vertical reinforcing pipe together through hoops; s7, dismantling the vertical rods 9 and the cross rods of the floor scaffold below the bottom floor 1, wherein safety measures are taken during dismantling, irrelevant people below are prohibited from walking, and people are prevented from falling from a high place or falling from objects to hurt people; and S8, removing the jack 6 and the connecting piece 7.

Before installing the I-steel 5, a steel bar scanner is needed to scan the arrangement form of the steel bars in the bottom floor slab 1, the positions of the plate bars are marked on the floor slab, and then all arrangement lines of the I-steel 5 are marked on the bottom floor slab according to the installation positions of the I-steel 5 in the structure diagram of the cantilever scaffold bottom support and the positions of the plate bars. Two arrangement lines are arranged on each I-shaped steel 5, and the distance between the two arrangement lines is the width of the web plate of the I-shaped steel 5; at least two steel bars are wrapped in the I-steel arrangement line of each I-steel 5.

Specifically, the specific installation steps of the i-steel 5 are as follows: s1, determining the fixing positions of the I-beams 5 on the bottom floor slab 1, drilling mounting holes at the fixing positions and on the outer sides of the I-beam arrangement lines, wherein two mounting holes are correspondingly arranged at each fixing position, and the distance between each mounting hole and a steel bar is preferably controlled within 10 mm; s2, opening the U-shaped bolt 2 upwards, penetrating the mounting hole upwards from the bottom of the bottom floor slab 1, sleeving a compression plate 3 at the upper end of the U-shaped bolt 2, placing the compression plate 3 on the I-shaped steel 5, and then tightly pressing the compression plate 3 and the I-shaped steel 5 by using a nut to fix the I-shaped steel 5 on the bottom floor slab 1. Specifically, the pressing plate 3 is a steel plate having a size of 100mm × 10mm (width × thickness), and a mounting hole is formed in the steel plate in advance in order to facilitate mounting of the U-bolt 2.

As shown in fig. 3, when installing the U-shaped bolt 2, a backing plate 4 is further sleeved on the lower end of the U-shaped bolt 2, and the backing plate 4 is placed under the floor slab 1. In this embodiment, the backing plate 4 is a steel plate with a thickness of 3mm, and the backing plate 4 is provided with mounting holes with a distance corresponding to the distance between the vertical screws in the U-shaped bolt 2.

Before the I-shaped steel 5 is installed, according to the installation position and the interval of the jack 6 in the drawing of the structure diagram of the cantilever scaffold bottom support, a fixing hole 51 for installing the jack 6 is drilled in the I-shaped steel 5, and the fixing hole 51 is arranged on a web plate of the I-shaped steel 5 with the vertical reinforcing pipe 8.

Specifically, the connecting member 7 in this embodiment includes a connecting rod installed at the upper end of the jack 6, the lower end of the connecting rod is rotatably installed at the upper end of the jack 6, the upper end of the connecting rod is transversely bent, and a hoop for clamping the vertical rod 9 on the floor scaffold is fixedly installed at the end of the bent section.

At S5, before the jack 6 is activated to ascend, the position above the vertical rod 9 of the scaffold is reinforced by a small cross rod which is 200mm higher than the reinforcing position of the vertical rod 9 of the scaffold.

After the floor type scaffold is converted into the overhanging type scaffold, before the floor type scaffold below the bottom floor slab 1 is dismantled, settlement monitoring points are set on the floor type scaffold, monitoring is carried out through a theodolite, and settlement is strictly controlled within 5 mm.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.

Claims

1. The construction process of the floor type scaffold-to-cantilever type scaffold is characterized by comprising the following steps of: s1, drawing a structure diagram of the bottom support of the overhanging scaffold according to the span of the floor scaffold; s2, according to the design requirements of I-shaped steel (5) in the structure diagram of the bottom support of the overhanging scaffold in the S1, I-shaped steel (5) with corresponding quantity and length are cut, a plurality of vertical reinforcing pipes (8) are welded on one web plate of the I-shaped steel (5) according to the space between the vertical rods (9) in the floor scaffold, and the space and the quantity of the vertical reinforcing pipes (8) correspond to the space and the quantity of the vertical rods (9) in the floor scaffold; s3, mounting the I-shaped steel (5) according to the structure diagram of the cantilever scaffold bottom support in the S1, and placing one end with the vertical reinforcing pipe (8) outwards when mounting; s4, calculating the number of jacks (6) according to the floor height and the span of the floor scaffold, installing and fixing the jacks (6) on the corresponding I-steel (5), and meanwhile, installing a connecting piece (7) capable of rotating circumferentially by taking the jack (6) as a center on each jack (6); the connecting piece (7) comprises a connecting rod arranged at the upper end of the jack (6), the lower end of the connecting rod is rotatably arranged at the upper end of the jack (6), the upper end of the connecting rod is transversely bent, and the tail end of the bent section is fixedly provided with a hoop for clamping an upright rod (9) on the floor scaffold; s5, fixedly connecting the connecting piece (7) with the floor type scaffold upright post (9) adjacent to the connecting piece, and then starting all the jacks (6) simultaneously to separate the bottom of the floor type scaffold from the ground to be suspended; s6, mounting a plurality of wall connecting cross rods on the upright rods (9) from bottom to top, and fixing the vertical reinforcing pipes (8) on the I-shaped steel and the upright rods (9) adjacent to the vertical reinforcing pipes together through hoops; s7, dismantling the vertical rods (9) and the cross rods of the floor scaffold below the bottom floor (1); and S8, removing the jack (6) and the connecting piece (7).

2. The construction process of the floor type scaffold-to-cantilever type scaffold according to claim 1, wherein before the I-steel (5) is installed, a steel bar scanner is used for scanning the arrangement form of the steel bars in the bottom floor (1), the positions of the steel bars are marked on the floor, and then the arrangement lines of all the I-steel (5) are marked on the bottom floor according to the installation position of the I-steel (5) in the structure diagram of the bottom support of the cantilever type scaffold and the positions of the steel bar marking.

3. The construction process of the floor type scaffold-to-cantilever scaffold according to claim 2, wherein two arrangement lines are provided for each I-steel (5), and the distance between the two arrangement lines is the width of the web of the I-steel (5); at least two steel bars are wrapped in the I-steel arrangement line of each I-steel (5).

4. The construction process of the floor scaffold-to-cantilever scaffold according to claim 2, wherein the specific installation steps of the I-steel (5) are as follows: s1, determining the fixing positions of the I-beams (5) on the bottom floor slab (1), drilling mounting holes at the fixing positions and on the outer sides of the I-beam arrangement lines, wherein two mounting holes are correspondingly arranged at each fixing position, and the distance between each mounting hole and a steel bar is preferably controlled within 10 mm; s2, opening the U-shaped bolt (2) upwards, penetrating the mounting hole upwards from the bottom of the bottom floor slab (1), sleeving a pressing plate (3) at the upper end of the U-shaped bolt (2), placing the pressing plate (3) on the I-shaped steel (5), and then tightly pressing the pressing plate (3) and the I-shaped steel (5) by using a nut to fix the I-shaped steel (5) on the bottom floor slab (1).

5. The construction process of the floor type scaffold-to-cantilever scaffold according to claim 4, wherein when installing the U-shaped bolt (2), a backing plate (4) is sleeved on the lower end of the U-shaped bolt (2), and the backing plate (4) is placed under the bottom floor (1).

6. The construction process of the floor scaffold-type inverted cantilever scaffold according to any one of claims 1 to 4, wherein before the I-steel (5) is installed, fixing holes (51) for installing the jacks (6) are drilled in the I-steel (5) according to the installation positions and the intervals of the jacks (6) in the drawing of the structure diagram of the bottom support of the cantilever scaffold, and the fixing holes (51) are arranged on a web plate of the I-steel (5) with the vertical reinforcing pipes (8).

7. The process for constructing a scaffolding scaffold inverted from overhanging according to claim 1, wherein in S5, the position above the scaffolding upright (9) is reinforced with a small cross bar 200mm higher than the position of reinforcement of the scaffolding upright (9) before the jack (6) is activated to ascend.

8. The construction process of the floor scaffold-to-cantilever scaffold according to claim 1, wherein after the floor scaffold is converted into the cantilever scaffold, a settlement monitoring point is set on the floor scaffold before the floor scaffold below the bottom floor (1) is removed, the settlement is monitored by a theodolite, and the settlement is strictly controlled within 5 mm.