CN101696566A - Construction method of mutilevel overpass scaffold - Google Patents

Abstract

The invention discloses a scaffolding construction method for a multi-layer overpass bridge. The scaffolding at the bottom layer is erected. The scaffolding at the bottom layer is provided with a steel frame door opening for vehicles and pedestrians to pass through. The inspection is carried out and a deformation monitoring system is installed, and a load pressure test is carried out on the scaffolding at the bottom layer; At least two layers of bridge scaffolding shall be erected on the bridge scaffolding, and a box girder door opening for bridge construction shall be erected on the bridge scaffolding. A deformation monitoring system shall be installed on the box girder door opening for comprehensive load test. The bottom scaffold of the present invention is provided with steel frame door openings to meet the traffic requirements of large vehicle traffic; each layer in the middle can be provided with intersecting box beam door openings in the same horizontal plane, and can also be provided with interlaced box girder door openings in the vertical direction , Selective construction according to needs; the entire scaffold only needs to be erected and disassembled once, which not only shortens the scaffold erection and dismantling time, but also reduces the risk of erecting and dismantling the scaffold; each layer of bridges can be constructed at the same time, the construction period is short, and the construction cost is low.

Description

Construction method of scaffolding for multi-storey overpass bridge

technical field

The invention relates to a method for constructing an overpass scaffold, in particular to a method for constructing a multi-layer overpass scaffold suitable for simultaneous construction.

Background technique

In the prior art, when building a multi-storey overpass, mostly adopt firstly to build the bottom scaffold, build the first floor bridge scaffold on the basis of the bottom scaffold, lay the formwork, cloth steel bars, pour concrete, after the first layer of bridge is poured and formed, dismantle the second For the bridge scaffolding on the first floor, re-build the scaffolding from the ground to the height of the bridge on the second floor. After the second-story scaffolding is built, formwork is laid, steel bars are laid, and concrete is poured, and so on. The height of a bridge. Therefore, the scaffolding construction of this overpass bridge is suitable for separate construction one by one, one by one, and one by one. Most designers and construction personnel believe that this kind of scaffold construction belongs to the existing mature construction technology, which is relatively safe in construction and has low construction difficulty. But also there are following deficiencies in the overpass scaffolding construction method of prior art: one, the bridge reinforced concrete pouring method is single, can only pour upwards gradually from the bottom layer, can't realize the simultaneous pouring of the upper and lower floors, so the construction period is long; two, one deck bridge pouring After forming, the scaffolding needs to be dismantled and rebuilt to the height of the bridge on the upper floor. In this way, the lower scaffolding needs to be repeatedly installed and disassembled, and the scaffolding takes a long time to build and the labor cost is high. It will cause traffic jams, and it is necessary to set up additional vehicle and pedestrian passages during erection; 4. Scaffolding monitoring uses a level gauge, which is carried out in time intervals, and cannot be monitored all-weather and on a full schedule at any time, and it is impossible to ensure that the entire construction process is under control; 5. Due to the large number of scaffolding Building and dismantling for the second time, the construction is on the main traffic road, there are many vehicles and people passing through, and the traffic hazards are great.

Therefore, the construction of scaffolding in the above-mentioned manner not only needs to consider the passing roads of pedestrians and vehicles, but also has a long construction period, high construction cost, single construction method and inflexibility, and the monitoring of scaffolding is carried out according to experience.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a multi-layer overpass scaffolding construction method that is especially suitable for traffic arterial roads, where the traffic volume is large, the traffic cannot be blocked, the construction needs to be completed quickly, and the traffic pressure is reduced as much as possible. Adopting this construction method not only has short construction period and low construction cost, but also has the flexibility to pour concrete.

Multi-storey overpass scaffolding construction method provided by the invention comprises the following steps:

a. Set up the bottom scaffolding. The bottom scaffolding is equipped with steel frame door openings for vehicles and pedestrians. The quality of the scaffolding is checked, and then the deformation monitoring system is installed on the bottom scaffolding, and the cargo pressure test is carried out on the bottom scaffolding. During the construction process, the deformation of the scaffold is monitored;

b. Set up at least two layers of bridge scaffolding on the bottom scaffolding. The bridge scaffolding is equipped with box girder door openings for bridge construction. After the entire bridge scaffolding is erected, check the quality of the entire scaffolding and install a deformation monitoring system on the box girder door openings. , and conduct a comprehensive cargo preload test to check the erection quality of the scaffold and verify the calculation before erection, check whether the deformation of the scaffold and section steel is within the specification requirements, and monitor the deformation of the scaffold during the entire construction process of the overpass .

Further, the deformation monitoring system includes a deformation sensor, a collector and a monitoring center computer, the deformation sensor is arranged on the beam of the steel frame door opening, its signal output terminal is connected to the collector, and the data output terminal of the collector is connected to the monitoring center computer;

Further, the steel frame door opening and the box girder door opening are mainly formed by bowl buckle scaffolding on both sides and the I-beam structure on the top. The I-beam structure includes the main I-beam, the bottom I-beam and the top I-beam. The bottom I-beam has two layers, which are respectively fixed on the bowl-buckle scaffolding brackets on both sides, and the main I-beam is fixed on the bottom I-beam in a manner perpendicular to the vehicle traffic direction. The top I-beam is laid on the main I-beam at a certain interval, and the top I-beam is fixedly connected with the lower support of the bowl-buckle scaffolding on it;

Further, the top I-beam is fixedly connected to the bottom support of the bowl-buckle scaffolding by welding, and the bottom I-beam is fixedly connected by welding the top support of the bowl-buckle scaffold;

Furthermore, the scaffolding is formed by connecting steel pipes through bowl fasteners.

The beneficial effect of the present invention is: multi-storey overpass scaffold construction method of the present invention adopts that the bottom layer is provided with the steel frame door opening for vehicles and pedestrians, each layer in the middle is provided with the used box girder door opening for overpass bridge construction, makes this construction method have The following advantages:

1. The bottom of the scaffold is equipped with steel frame door openings for vehicles and pedestrians, which is suitable for traffic arterial roads. The traffic flow is large, and the traffic cannot be blocked. It needs to be completed quickly and the construction requirements of reducing traffic pressure as much as possible.

2. There are box girder door openings for bridge construction on each floor in the middle. The number of box girder door openings can be determined according to the number of bridges to be built. Intersecting box girder door openings can be set in the same horizontal plane, or in the vertical direction By setting interlaced box girder door openings, one layer of bridges can be constructed first according to needs, and all bridges can also be constructed simultaneously, so the bridge construction organization method is flexible.

3. Set a deformation sensor on the beam of the steel frame door opening, and use the deformation sensor to detect the deformation of the I-shaped steel beam as the beam under stress, and input the deformation data into the central computer through the acquisition instrument, and the central computer will display the work For the deformation of the beam, if the deformation exceeds the specified deformation value of the I-beam, the central computer will send out a danger alarm signal. The monitoring method is scientific and the whole process of monitoring is safe and reliable.

4. The scaffolding within the entire construction scope only needs to be erected and disassembled once, without repeated erection and disassembly, which not only shortens the scaffolding construction time, but also reduces the risk of erecting and dismantling the scaffolding; Short and low construction cost.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a partial plane view of a steel frame door opening or a box girder door opening in Fig. 1;

Fig. 3 is a view along the direction A of Fig. 2 .

Detailed ways

Fig. 1 is a schematic structural view of the present invention, Fig. 2 is a partial plane view of a steel frame door opening or a box girder door opening in Fig. 1, and Fig. 3 is an A-direction view of Fig. 2, as shown in the figure: the construction method of multi-layer overpass scaffolding includes the following Described steps: a. Utilize the bridge column that has been constructed as the core tube, and use bowl button scaffolding and section steel to diverge outwards to build the bottom scaffold around this. The bottom scaffold is equipped with a steel frame door opening 2 for vehicles and pedestrians to pass through. Carefully inspect the erection quality of the bottom scaffolding, then install a deformation monitoring system on the bottom scaffold, carry out a cargo pressure test on the bottom scaffold, and monitor the deformation of the scaffold during the entire construction process of the overpass; b. Set up at least two scaffolds on the bottom scaffold The bridge scaffolding is equipped with a box girder door opening 3 for bridge construction. After the entire bridge scaffolding is erected, the quality of the entire scaffolding is carefully checked, and a deformation monitoring system is installed on the box girder door opening to carry out comprehensive scaffolding inspection. Cargo preload test is used to check the quality of scaffolding and verify the calculation before erection, check whether the deformation of scaffolding and section steel is within the specification requirements, and monitor the deformation of scaffolding during the entire construction process of the overpass.

This embodiment is a double-layer overpass scaffolding, the bottom is provided with three steel frame door openings 2 for vehicles and pedestrians to facilitate the passage of vehicles and pedestrians; the first floor bridge and the second floor bridge are vertically staggered bridges, the second The first floor bridge scaffolding is provided with the used box girder door opening 3 for the construction of the first floor bridge, which is mainly for the convenience of laying templates, cloth reinforcement, and concrete pouring. It is also the opening for vehicles and pedestrians to pass on the first floor bridge.

The steel frame door opening 2 and the box beam door opening 3 are mainly formed by bowl buckle scaffolding 4 on both sides and the I-beam structure 5 on the top. The I-beam structure 5 includes the main I-beam 6, the bottom I-beam 7 and the top The beam 8 and the I-beam 7 at the bottom are two layers, which are respectively fixed on the bowl buckle scaffolding 4 on both sides, and the main I-beam 6 is fixed on the bottom I-beam 7 in a manner perpendicular to the direction of vehicle traffic , the top I-beam 8 is laid on the main I-beam 6 at a certain interval, the top I-beam is fixedly connected with the bowl-buckle scaffolding support by welding, and the bottom I-beam is welded through the bowl-buckle scaffold support Fixed connection.

The deformation monitoring system includes a deformation sensor, an acquisition instrument and a monitoring center computer. The deformation sensor is set on the main I-beam as a beam, and its signal output terminal is connected to the acquisition instrument, and the data output end of the acquisition instrument is connected to the monitoring center computer. The deformation monitoring of scaffolding and I-beams is changed from the traditional manual use level to the deformation monitoring system for main monitoring, and the manual use of the level is used to assist the deformation monitoring system for monitoring and inspection. All-weather, all-day testing.

After the scaffolding is built, it is necessary to conduct a cargo pressure test. The cargo load is 1.2 times the dead load and 1.4 times the live load to test the bearing capacity of the entire scaffold and observe the deformation of the main I-beam on the computer of the monitoring center. , to ensure the stability and safety performance of the entire scaffold structure. The parts connected with the entire I-beam are welded to ensure a firm connection.

The scaffolding is made of steel pipes connected by bowl fasteners. Using bowl fasteners to connect steel pipes is not only convenient for installation or disassembly, but also can increase the construction speed.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements do not depart from the spirit and scope of the technical solution, and all of them should be included in the scope of the claims of the present invention.

Claims (5)

1. a construction method of mutilevel overpass scaffold is characterized in that: comprise the steps:

A, set up bottom layer scaffold, bottom layer scaffold is erected with the steelframe door opening for vehicles and pedestrians, to scaffold set up quality inspection, DEFORMATION MONITORING SYSTEM is installed on bottom layer scaffold then, bottom layer scaffold is carried out the cargo pressure testing;

B, on bottom layer scaffold, set up two-layer at least bridge scaffold, the bridge scaffold building has for the used case Liangmen hole of bridge construction, after whole bridge scaffold building is intact, whole scaffold building quality is checked, on case Liangmen hole, DEFORMATION MONITORING SYSTEM is installed, and carry out comprehensive cargo precompressed test, in order to check setting up quality and the calculating before setting up being verified of scaffold, whether the distortion of checking scaffold and shaped steel is within code requirement.

2. construction method of mutilevel overpass scaffold according to claim 1, it is characterized in that: described DEFORMATION MONITORING SYSTEM comprises deformation-sensor, Acquisition Instrument and monitoring center's computer, deformation-sensor is arranged on the crossbeam of steelframe door opening, its signal output part is connected with Acquisition Instrument, and the data output end of Acquisition Instrument is connected with the monitoring center computer.

3. construction method of mutilevel overpass scaffold according to claim 1 and 2, it is characterized in that: described steelframe door opening and case Liangmen hole are mainly formed by the i-beam structure that both sides bowl fastening type scaffold and top are provided with, i-beam structure comprises main steel I-beam, bottom i iron and top i iron, described bottom i iron is two-layer, be fixedly installed on respectively in the pop-up of both sides bowl fastening type scaffold, described main steel I-beam is to be fixedly installed on the steel I-beam of bottom with the perpendicular mode of vehicle pass-through direction, the top i iron is laid on the main i iron with certain interval, and the top i iron is fixedlyed connected with the bowl fastening type scaffold subiculum on it.

4. construction method of mutilevel overpass scaffold according to claim 3 is characterized in that: described top i iron and the bowl fastening type scaffold subiculum on it are fixedly connected by welding, and the bottom i iron is fixedly connected by bowl fastening type scaffold pop-up welding.

5. construction method of mutilevel overpass scaffold according to claim 4 is characterized in that: described scaffold is formed by connecting by the bowl fastener by steel pipe.

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