CN115822233A - Construction process of overhanging scaffold - Google Patents

Abstract

The application discloses scaffold that encorbelments frame construction technology belongs to building engineering technical field. The cantilever I-shaped steel is installed on an embedded part embedded in the original construction process of a lower tower column; laying a first steel plate on the overhanging I-shaped steel to form a set-up foundation; and erecting the overhanging scaffold on the erection basis. It can be understood that, in the method, the scaffold is not set up from the ground, but the scaffold is set up from the construction height of the lower tower column, the overhanging I-shaped steel is installed on the embedded part embedded in the original construction process of the lower tower column, and the scaffold is set up on the basis of the overhanging I-shaped steel and the support of the steel plate, so that the setting material cost and the labor cost of the scaffold with the length of at least 16 meters are saved. In addition, the vertical rods, the longitudinal horizontal rods, the transverse horizontal rods and the cross braces are used in the method for erecting the vertical rods, the longitudinal horizontal rods, the transverse horizontal rods and the cross braces, so that the stability of the scaffold is enhanced, and the safety of the scaffold is improved.

Description

Construction technology of cantilevered scaffolding

technical field

The present application relates to the technical field of building construction, in particular to a construction technique of a cantilevered scaffold.

Background technique

Before reinforcing the lower tower column, scaffolding needs to be set up for construction workers to carry out reinforcement construction at the construction height of the lower tower column, but because the lower tower column of the main tower is inclined to the ground, and the construction height of the lower tower column is 16 More than meters, if the scaffolding is erected according to the current erection method, the erection cost will be higher.

The above content is only used to assist in understanding the technical solution of the present application, and does not mean that the above content is admitted as prior art.

application content

The main purpose of this application is to provide a construction technique for cantilevered scaffolding, aiming to solve the technical problem of high scaffolding erection cost in the prior art.

In order to achieve the above object, the application proposes a cantilevered scaffolding construction process, the cantilevered scaffolding construction process includes the following steps:

Install cantilevered I-beams on the pre-embedded parts pre-buried in the original construction process of the lower tower column;

Laying the first steel plate on the cantilevered I-beam to form the erection foundation;

The cantilevered scaffold is erected on the erection basis.

Optionally, the step of erecting the cantilevered scaffold on the erection foundation includes:

erecting poles on said erecting foundation;

After the erection of the vertical rod is completed, a vertical horizontal rod is erected, and the intersection of the vertical horizontal rod and the vertical rod is fixed with a right-angle fastener;

After the erection of the longitudinal horizontal bar is completed, a horizontal horizontal bar is erected below the longitudinal horizontal bar;

After the erection of the horizontal bar is completed, set up a scissors brace on the outside of the vertical bar, and use a rotary fastener to connect the scissors brace and the outer vertical bar at the junction.

Optionally, the step of erecting poles on the erected foundation includes:

Supporting the vertical rod directly above the cantilevered I-beam;

U-shaped steel bars are welded on the cantilevered I-beam, and the vertical bar is fixedly connected with the cantilevered I-shaped steel bar through the U-shaped steel bar to complete the erection of the vertical bar.

Optionally, the vertical pole directly above the cantilevered I-beam is spliced by a plurality of steel pipes of different lengths.

Optionally, the connections of multiple steel pipes of adjacent vertical poles directly above the cantilevered I-beam are at different heights.

Optionally, the difference in height between the multiple steel pipes of the adjacent poles at different heights is at least 50 centimeters.

Optionally, the top-layer connections of the plurality of steel pipes of the vertical rod are connected by bridging, and the non-top-layer connections are connected by butt fasteners.

Optionally, the cantilevered I-beam is symmetrically cantilevered on the large and small mileage sides of the lower tower column.

Optionally, after the step of erecting poles on the erected foundation, the method further includes:

A longitudinal sweeping rod and a horizontal sweeping rod are installed at least 20 centimeters upwards from the bottom of the pole.

Optionally, after the step of erecting the cantilevered scaffold on the erection foundation, the method further includes:

The second steel plate pre-embedded in the original construction process of the lower tower column is used as a connecting wall piece;

The cantilevered scaffold is reinforced by using the wall connecting piece;

Lay the scaffold board on the first step and the operation layer of the cantilevered scaffold, and lay a horizontal safety net on the non-operational layer of the cantilevered scaffold.

The application proposes a construction technique for cantilevered scaffolding. In the prior art, since the lower column of the main tower is inclined to the ground, and the construction height of the lower column is more than 16 meters, if the scaffolding is erected according to the current erection method, The erection cost is relatively high. Compared with it, the application installs the cantilevered I-beam on the pre-embedded parts embedded in the original construction process of the lower tower column; the first steel plate is laid on the cantilevered I-beam to form the The foundation; erecting the cantilevered scaffold on the erecting foundation. It can be understood that this application does not start to build scaffolding from the ground, but starts to build scaffolding from the construction height of the lower tower column. Under the support of cantilevered I-beams and steel plates, scaffolding is built on this basis, saving at least the cost of materials and labor costs for scaffolding below 16 meters.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings without paying creative labor.

Fig. 1 is the schematic flow sheet of the first embodiment of the cantilevered scaffolding construction technique of the present application;

Fig. 2 is the horizontal layout of the scaffolding in the second embodiment of the cantilevered scaffolding construction process of the present application;

Fig. 3 is the layout diagram of the scaffold along the bridge direction of the third embodiment of the cantilevered scaffold construction process of the present application;

Fig. 4 is a schematic flowchart of the fourth embodiment of the cantilevered scaffolding construction process of the present application.

The realization of the purpose, functions and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

The embodiment of the present application provides a cantilevered scaffolding construction process. Referring to FIG. 1 , FIG. 1 is a schematic flowchart of the first embodiment of the cantilevered scaffolding construction process of the present application.

In this embodiment, the cantilevered scaffolding construction process includes the following steps:

Step S10: installing cantilevered I-beams on the pre-embedded parts embedded in the original construction process of the lower tower column;

As an example, since the total height of the main pier is 23.057 meters and the original construction platform has been dismantled, the construction platform needs to be rebuilt before the lower tower column is reinforced.

As an example, the main tower is composed of an upper tower column, a middle tower column and a lower tower column, as shown in Figure 2, the construction site of the lower tower column is the black shaded part in the figure. During the actual construction process, the measured height of this part is above 16 meters from the ground of the lower main tower. And the lower tower column is in an inclined state relative to the ground.

As an example, before the construction is carried out on the cross-bridge direction of the lower tower column, scaffolding needs to be set up around the lower tower column, that is, scaffolding is respectively erected in the cross-bridge direction and along the bridge direction of the lower tower column. Specifically, as shown in Figure 3, the scaffolding that needs to be erected when constructing the lower tower column along the direction of the bridge is erected from the top surface of the cap, and the scaffold body is erected to the top of the lower beam. The overall height measured during the on-site construction is 23.057 meters. That is, the scaffolding along the bridge is a floor-standing scaffold, which is not described in detail in this application.

As an example, when scaffolding is erected for the lower tower column in the direction of the transverse bridge, in the prior art, the lower tower column of the main tower is inclined to the ground, and the construction height of the lower tower column is more than 16 meters. The erection method is used to erect the scaffold, and the erection cost is relatively high, that is, a large amount of material cost will be wasted if the scaffold is erected from the ground. Therefore, the scaffold erected in the direction of the transverse bridge is a cantilevered scaffold.

As an example, use the embedded part embedded in the lower column part of the original main tower during the construction process, install the cantilevered I-beam on the embedded part, specifically, weld the cantilevered I-beam on the embedded part steel corbel, and then fix the cantilevered I-beam to the cantilevered I-beam corbel, one end of the cantilevered I-beam cantilevered, and the other end is fixed on the lower tower structure.

As an example, the cantilevered I-beam is I20B I-beam.

In this embodiment, there are four lower tower columns, and the cantilevered I-beam is symmetrically cantilevered on the side of the four lower tower columns.

As an example, referring to FIG. 2 , the cantilevered I-beam symmetrical cantilever on the large and small mileage sides of the pair of lower main towers in the viewing angle along the bridge can be 2.65 meters or 2.67 meters.

As an example, referring to FIG. 3 , the left and right side I-beams of the two lower main towers in the direction of the transverse bridge are symmetrically overhanged, which can be 3 meters or 3.2 meters.

As an example, symmetrical overhangs can reduce structural prestress losses in the lower main tower.

Step S20: laying a first steel plate on the cantilevered I-beam to form a foundation;

As an example, the first steel plate is laid on the cantilevered I-beam to form a foundation, which can strongly support the weight of the scaffold.

As an example, the trestle bridge and the cantilevered I-beam can also be combined, and the first steel plate is laid on the trestle bridge and the cantilevered I-beam to form the erection foundation.

As an example, the first steel plate is a checkered steel plate, which can play an anti-slip function and improve construction safety.

Step S30: Erection of the cantilevered scaffold on the erection foundation.

As an example, a cantilevered scaffold is erected on the periphery of the four lower main towers, that is, all materials used from the ground to the erected foundation are reduced, and the cost is saved.

In this embodiment, the step of erecting the cantilevered scaffold on the erection basis includes:

Step S31: setting up poles on the basis of erection;

As an example, before erecting the pole, a steel wire rope is pulled at the cantilevered end of the cantilevered I-beam, and a reinforcement pile is welded at the bottom of the fixed end of the cantilevered I-beam, so as to ensure the stability of the erected foundation.

As an example, the pole is the first step in erecting the scaffold. After erecting the pole, the frame part of the scaffold is determined.

In this embodiment, the step of erecting poles on the erection basis includes:

Step S310: supporting the vertical rod directly above the cantilevered I-beam;

As an example, the horizontal spacing of the cantilevered I-beams is the same as that of the vertical poles of the scaffold, and the vertical poles are directly supported directly above the I-beams of the cantilevered steel platform to ensure the stability of the scaffolding frame.

Step S320: welding U-shaped steel bars on the cantilevered I-beam, and fixedly connecting the vertical pole with the cantilevered I-shaped steel bar through the U-shaped steel bar, so as to complete the erection of the vertical pole.

As an example, there are reliable positioning and connection measures between the scaffold pole and the cantilevered I-beam to ensure the stability of the scaffold body.

Specifically, a U-shaped steel bar is welded on the cantilevered I-beam, and the length of the U-shaped steel bar is at least 150-200 mm and the diameter is at least 25 mm.

As an example, the outer diameter of the poles is the same, the distance between the poles is not more than 1.3 meters, the horizontal distance is not more than 1.8 meters, and the distance between the inner poles and the wall of the lower tower column is not more than 0.8 meters (to facilitate the later formwork installation and reinforcement, here The neutral gear can utilize the vertical horizontal bar to set up a springboard to complement the neutral gear).

In this embodiment, the vertical pole directly above the cantilevered I-beam is spliced by a plurality of steel pipes with different lengths.

In this embodiment, the connections of multiple steel pipes of the adjacent vertical poles directly above the cantilevered I-beam are at different heights, so as to ensure the overall stability of the scaffold and prevent it from collapsing.

In this embodiment, the difference in height between the multiple steel pipes of the adjacent poles at different heights is at least 50 centimeters.

In this embodiment, the top-layer connections of the plurality of steel pipes of the vertical rod are connected by lapping, and the non-top-layer connections are connected by butt fasteners.

As an example, the top layer of the joints of the plurality of steel pipes of the vertical rod can be connected by bridging, and the rest of the joints should be connected by butt fasteners to enhance the stability of the scaffolding frame.

As an example, the overlapping connection length of two steel pipes is at least 1 meter, and at least 2 rotating fasteners are used to fix it.

Step S32: After the erection of the vertical pole is completed, erect a vertical horizontal pole, and fix it with a right-angle fastener at the intersection of the vertical horizontal pole and the vertical pole;

As an example, the vertical pole and the vertical horizontal pole are sleeved on the steel bar, and the horizontal and vertical sweeping poles are set up at the lower part of the vertical pole at the same time.

As an example, if the bottoms of the vertical poles are not at the same level, extend the high vertical sweeping pole for two spans and fix it with the low-span vertical pole.

As an example, the vertical horizontal rods should be arranged horizontally, and the length of the steel pipes should be at least 3 meters; the step height of the vertical horizontal rods should be every 1.8 meters.

As an example, the intersection of the vertical horizontal bar and the vertical bar is fixed with the vertical bar by using a right-angle fastener.

As an example, the scaffolding erected along the periphery of the lower tower column should adopt a closed form, and the longitudinal horizontal bars of the same step of the scaffold should be in a closed state, that is, the longitudinal horizontal bars in different directions should be connected with right-angle buckles at the corners.

Step S33: After the erection of the longitudinal horizontal rod is completed, a horizontal horizontal rod is erected below the longitudinal horizontal rod;

As an example, the horizontal horizontal bar is arranged below the longitudinal horizontal bar, and a horizontal horizontal bar needs to be provided at the intersection of the vertical bar and the longitudinal horizontal bar, and it cannot be dismantled arbitrarily.

In this embodiment, after the step of erecting poles on the erected foundation, the method further includes:

Step A1: installing a vertical sweeping pole and a horizontal sweeping pole at least 20 cm above the bottom of the pole.

As an example, setting up sweeping poles can effectively increase the overall rigidity of the formwork support, so that the force on the poles tends to be uniform, that is to say, the poles can effectively work together to increase the bearing capacity, and at the same time, it can avoid the partial stiffness of the support. The phenomenon of small size and excessive deformation will affect the stability of the whole bracket.

As an example, the installation of longitudinal sweeping poles and transverse sweeping poles should meet the following requirements:

installed at least 20 cm above the bottom of the pole;

Fix the vertical sweeping rod and horizontal sweeping rod to the vertical rod with right-angle fasteners;

When the bottom of the pole is not at the same level, the high longitudinal sweeping pole must be extended for two spans and fixed with the low span pole.

Step S34: After the erection of the horizontal bar is completed, a scissor brace is set up on the outside of the vertical bar, and a rotating fastener is used to connect the scissor brace and the outer vertical bar at the junction.

As an example, the arrangement of the scissors braces should be uniform, the steel pipes of the scissors braces should be erected by pull wires, and the joints with the outer poles should be connected with the poles by rotating fasteners.

As an example, the scissor braces are arranged on the outside of the scaffold poles, and the joints of the poles are connected by lap joints with a lap length of 1000 mm, fixed by at least 3 rotating fasteners with a fixed spacing of 800 mm.

As an example, there should be 4-6 vertical bars for each scissors brace, forming an angle of 45°-60° with the longitudinal horizontal bar.

As an example, the width of each scissor brace is at least 4 spans and not less than 6 meters, and the scissor brace is continuously arranged from bottom to top along the scaffold, and the distance between them is not more than 20 cm.

In this embodiment, a cantilevered I-beam is installed on the pre-embedded parts pre-buried in the original construction process of the lower tower column; the first steel plate is laid on the cantilevered I-beam to form the erection foundation; Set up the cantilevered scaffolding on the basis. It can be understood that this application does not start to build scaffolding from the ground, but starts to build scaffolding from the construction height of the lower tower column. Under the support of cantilevered I-beams and steel plates, scaffolding is built on this basis, saving at least the cost of materials and labor costs for scaffolding below 16 meters. Moreover, in the present application, the erection method of the above-mentioned vertical poles, longitudinal horizontal poles, horizontal horizontal poles, and scissors bracing is used to enhance the stability of the scaffolding and improve the safety of the scaffolding.

Further, the embodiment of the present application provides a second embodiment on the basis of the above embodiments of the cantilevered scaffolding construction technology. Referring to FIG. 4 , FIG. 4 is a schematic flowchart of the second embodiment of the cantilevered scaffolding construction process of the present application.

In this embodiment, after the step of erecting the cantilevered scaffold on the erection foundation, the method further includes:

Step S40: using the second steel plate pre-embedded in the original construction process of the lower tower column as a connecting wall piece;

As an example, the second steel plate pre-embedded in the original construction process of the lower tower column is used as a connecting wall piece.

As an example, L steel bars and horizontal steel pipes are welded and fixed, and the free height of the upper wall parts of the scaffold is not greater than 2 floors.

As an example, since the uppermost part of the scaffold will bear a large wind force, the brace connecting rods should be densely arranged, and the wall rods should be arranged at the connection between the vertical rod and the horizontal horizontal rod.

Step S50: Reinforcing the cantilevered scaffold with the wall connecting piece;

As an example, the cantilevered scaffolding is reinforced by using the wall connecting piece so that it is not easy to separate from the wall of the lower tower column, thereby improving safety.

Step S60: laying scaffold boards on the first step and the operation layer of the cantilevered scaffold, and laying a horizontal safety net on the non-operational layer of the cantilevered scaffold.

Scaffold laying requirements:

As an example, the first step and the operation layer of each cantilevered scaffold need to be laid with scaffolding boards, and the non-operation level needs to be laid with horizontal safety nets.

As an example, planks should be laid between the inner poles of the scaffold and the wall of the lower tower column: the board width should be at least 200 mm, and the inner and outer poles should be fully covered with scaffolding boards, without probe boards.

As an example, scaffolding boards must be laid vertically and horizontally on the wall without leaving any gaps, and effective protective measures must be taken where they cannot be fully paved, such as adding horizontal safety nets, etc.

As an example, the scaffold board needs to be tied with 18 lead wires in parallel, not less than 4 points.

Requirements for the laying of horizontal safety nets: from the bottom of the scaffolding, all are fully enclosed with dense-mesh safety nets, and the dense-mesh nets must be set on the inner side of the outer row of vertical poles. The binding of the dense mesh should be bound with a nylon rope loop or with a short rope for each hole.

Finally, after the scaffolding is completed and the safety measures are taken, it is necessary to build a pedestrian ramp. The design of the pedestrian ramp: the width of the pedestrian ramp is at least 1.2 meters, and the slope is 1:3 (height: length).

As an example, the ramp width is at least 1.5 metres.

As an example, on both sides of the ramp and on the periphery of the turning platform, protective railings of at least 1.2 meters and toe guards with a height of at least 180 mm are provided.

As an example, the scaffolding of a pedestrian ramp is nailed with non-slip wooden strips with a thickness of at least 30 mm and a spacing of at least 250 mm.

In this embodiment, after the assumption of the scaffolding is completed, the above-mentioned wall parts, scaffolding boards, safety nets, etc. are used to reinforce the scaffolding to improve stability and safety.

It should be noted that, as used herein, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or system comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or system. Without further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system comprising that element.

The serial numbers of the above embodiments of the present application are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structures or equivalent process transformations made by using the description of the application and the accompanying drawings are directly or indirectly used in other related technical fields. , are all included in the patent protection scope of the present application in the same way.

Claims (10)

1. a kind of cantilevered scaffolding construction technique is characterized in that, described cantilevered scaffold construction technique comprises the following steps: Install cantilevered I-beams on the pre-embedded parts pre-buried in the original construction process of the lower tower column; Laying the first steel plate on the cantilevered I-beam to form the erection foundation; The cantilevered scaffold is erected on the erection basis. 2. The cantilevered scaffold construction process as claimed in claim 1, wherein the step of erecting the cantilevered scaffold on the basis of the erection includes: erecting poles on said erecting foundation; After the erection of the vertical rod is completed, a vertical horizontal rod is erected, and the intersection of the vertical horizontal rod and the vertical rod is fixed with a right-angle fastener; After the erection of the longitudinal horizontal bar is completed, a horizontal horizontal bar is erected below the longitudinal horizontal bar; After the erection of the horizontal bar is completed, set up a scissors brace on the outside of the vertical bar, and use a rotary fastener to connect the scissors brace and the outer vertical bar at the junction. 3. The construction technique of cantilevered scaffolding as claimed in claim 2, characterized in that, the step of erecting poles on the basis of the erection includes: Supporting the vertical rod directly above the cantilevered I-beam; U-shaped steel bars are welded on the cantilevered I-beam, and the vertical bar is fixedly connected with the cantilevered I-shaped steel bar through the U-shaped steel bar to complete the erection of the vertical bar. 4. The construction technique of cantilevered scaffolding according to claim 3, characterized in that, the vertical bar just above the cantilevered I-beam is spliced by a plurality of steel pipes with different lengths. 5. The construction technique of cantilevered scaffolding according to claim 4, characterized in that, the connections of multiple steel pipes of adjacent vertical poles directly above the cantilevered I-beam are at different heights. 6 . The construction technique for cantilevered scaffolding according to claim 5 , wherein the difference in height between the multiple steel pipe connections of the adjacent vertical poles is at least 50 centimeters. 7. The construction technique of cantilevered scaffolding according to claim 4, characterized in that, the top-layer connections of the plurality of steel pipes of the vertical rods are connected by lapping, and the non-top-layer connections are connected by butt fasteners. 8. The construction technique of cantilevered scaffolding according to claim 1, characterized in that, the cantilevered I-beam is cantilevered symmetrically on the large and small mileage sides of the lower tower column. 9. The cantilevered scaffold construction process as claimed in claim 3, characterized in that, after the step of erecting poles on the basis of the erection, the method further comprises: A longitudinal sweeping rod and a horizontal sweeping rod are installed at least 20 centimeters upwards from the bottom of the pole. 10. The construction technique of cantilevered scaffolding as claimed in claim 3, characterized in that, after the step of erecting said cantilevered scaffolding on said erecting basis, said method further comprises: The second steel plate pre-embedded in the original construction process of the lower tower column is used as a connecting wall piece; The cantilevered scaffold is reinforced by using the wall connecting piece; Lay the scaffold board on the first step and the operation layer of the cantilevered scaffold, and lay a horizontal safety net on the non-operational layer of the cantilevered scaffold.

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