CN104989092B - A kind of construction method of high-altitude overhanging superposed type steel truss bearing platform - Google Patents

Abstract

The invention discloses a kind of construction method of high-altitude overhanging superposed type steel truss bearing platform, mainly inclusion screw rod associated part is pre-buried, and it is in place that steel truss hangs stake, removable jointing plate, additional jointing plate are installed, guide rails assembling, upper steel truss installa-tion, drag-line is installed, the step that scaffold formwork system is set up.The construction bearing platform of encorbelmenting that this bearing system safety coefficient is higher, assembly and disassembly is convenient, makes full use of steel truss and solves the problems, such as that traditional I-steel span of encorbelmenting is not enough, and substantially increases the safety of structure of finishing of constructing.

Description

A construction method for a high-altitude suspended composite steel truss load-bearing platform

technical field

The invention relates to a construction method of a steel truss load-bearing platform, in particular to a construction method of a high-altitude suspended superimposed steel truss load-bearing platform.

Background technique

In order to meet the various functional and aesthetic requirements of modern people for buildings, more and more projects with novel designs are emerging, especially in public construction projects, large buildings cantilevered in the air at a height of tens of meters or even hundreds of meters. The span structure is more common. Most of the traditional cantilevered structure construction load-bearing platforms are constructed by erecting full steel pipe scaffolding from the ground or using pre-embedded steel plates (reinforcement bars) in the concrete structure of the lower floor, or using section steel cantilever or welding assembly on site. A load-bearing construction platform. Although the operation method of erecting a full-wall steel pipe scaffolding from the ground is simple and the force calculation is intuitive, it requires a lot of turnover materials and labor in actual construction, and because this type of scaffolding is used for high erection heights and bears construction loads and self-loads. In the case of a large formwork frame, the overall stability of the frame is often difficult to guarantee, and quality and safety accidents are prone to collapse of the tall formwork frame. The other formwork support system adopts cantilevered steel load-bearing platform, its cantilevered span is only suitable for 2~3 meters, the scope of use has its limitations, and it needs to consume a lot of various steel materials, which requires high technical requirements for on-site welding workers. Most of such construction platforms are one-time investment, which cannot be reused and labor-intensive. For the construction of the cantilever structure of high-rise buildings, and considering the shortcomings of the above two construction methods, some construction units use steel trusses to build the load-bearing platform of the cantilever structure construction. This construction method makes full use of the frame columns of the original structure, Pre-embed or install iron parts on the frame columns, connect steel trusses through iron parts, and set up a load-bearing platform. While there are many benefits to new steel trusses used to erect construction platforms for cantilevered structures, the steel trusses themselves may cause damage to the completed structure.

Contents of the invention

The object of the present invention is to provide an economical, convenient, safe and reusable construction method of a load-bearing platform, which can be effectively used in the construction of cantilevered structures.

For realizing the above object, technical scheme of the present invention is:

A construction method for a high-altitude suspended superimposed steel truss load-bearing platform, characterized in that the load-bearing platform is mainly composed of a bottom steel truss, an upper steel truss, a scaffold formwork system, a pre-embedded recoverable screw, a partially recoverable screw, It consists of guide rails, detachable weight plates, additional weight plates, cables and structural columns; the bottom steel trusses are fixed on the completed structural columns through pre-embedded recoverable screws and partially recoverable screws, and the bottom steel trusses There are detachable fixed weight plates and additional weight plates on the outside; the upper steel truss is connected to the bottom steel truss by bolt welding combination and guide rails, and a cable is set between the detachable weight plate and the end of the upper steel truss; The upper steel truss protrudes out of the structure and becomes the load-bearing platform for the scaffolding system of the upper cantilevered structure;

The construction method of the high-altitude suspended composite steel truss load-bearing platform includes the following construction steps:

Step 1. Pre-embedding of screw-related parts: before the construction of the concrete structure layer, embed the PVC sleeve of the recyclable screw and the vertical anchor screw, and the screw hole of the partially recyclable screw in the structural column;

Step 2: hoist the steel truss into place: hoist the underlying steel truss after the maintenance of the concrete structural slab is completed, and fix the underlying steel truss with pre-embedded recoverable screws and partially recoverable screws;

Step 3. Installation of detachable weight plates and additional weight plates: After the installation of the bottom steel truss is completed, the detachable weight plates are welded and connected, and the number of additional weight plates is determined according to the actual project. type weight plate;

Step 4. Guide rail installation: the guide rail is installed on the top of the bottom steel truss;

Step 5. Installation of the upper steel truss: Insert the upper steel truss on the guide rail to form an embedded connection. After the embedded connection is completed, connect the upper steel truss and the bottom steel truss by bolt welding;

Step 6. Cable installation: install the cable between the detachable weight plate and the end of the upper steel truss;

Step 7. Erection of the scaffold formwork system: use the protruding part of the upper steel truss to build a scaffold formwork system with a cantilevered structure, and the protruding steel truss is used as the load-bearing platform of the scaffold formwork system.

The pre-embedded recyclable screw is set in the concrete floor under the steel truss at the bottom, and is composed of a PVC sleeve, a vertical anchor screw and an anchor roof. The PVC sleeve is placed outside the vertical anchor screw, and the anchor roof passes through the vertical Anchor screws and nuts are fixedly installed on the lower chord plate of the steel truss at the bottom; direction hinges are provided on the vertical anchor screws. The vertical anchoring screw can be provided with a directional hinge at an appropriate position to make the screw easy to retract. When the steel truss is removed, the anchor top plate is removed, and the entire anchor fastener can be easily removed by tapping the top of the screw rod, which can be used repeatedly.

The partially recyclable screw is arranged in a structural column near the steel truss, and a bolt hole is provided in the structural column. After the steel truss is installed, the screw connected to the steel truss is screwed into the bolt hole. When dismantling, the screw rod is removed, and the bolt holes are left in the structural column without dismantling.

The detachable ballast plate connected to the bottom steel truss is placed on the concrete floor, and is connected with the concrete floor through a pre-embedded recyclable screw. Its function is to increase the load of the bottom steel truss and avoid the overturning and sliding of the bottom steel truss . The additional ballast plate is a concrete block, which is placed on a detachable ballast plate to match the ballast.

The guide rail is set on the upper chord plate of the bottom steel truss, and is embedded to connect the upper steel truss. There are pulleys on both sides of the guide rail. The upper steel truss uses the pulleys in the guide rail to realize sliding. In order to ensure the safety of construction, in addition to connecting with the guide rail The upper steel truss and the lower steel truss are connected by bolt welding.

The cable is connected to the steel truss and the detachable ballast plate, one end of the cable is provided with an end and embedded in the detachable ballast plate, and the other end is connected to the steel truss system. Its purpose is to use the existing structure to assist in bearing the load of the steel truss.

The present invention has the following advantages and beneficial effects:

1. The bearing capacity of this load-bearing platform is better, and the use of lighter steel trusses instead of traditional I-beams not only ensures the safety of the structure, but also can be applied to large-span cantilever structures due to the various forms of steel trusses.

2. The main part of the load-bearing platform can be disassembled and can be reused in multiple projects, which improves economic benefits.

3. The load-bearing structure is equipped with a variety of measures to protect the existing structure, avoiding the damage to the existing structure by the traditional cantilevered load-bearing platform.

Description of the drawings:

Figure 1-Elevation view of steel truss load-bearing platform.

Figure 2 - Elevation view of retrievable screw rod.

Figure 3 - Elevation view of partial retrievable screw.

Figure 4 - Elevation view of the guide rail.

1-bottom steel truss; 2-upper steel truss; 3-scaffolding formwork system; 4-concrete floor; 5-lower chord; 6-upper chord; 7-partially recoverable screw; Type screw; 10-structural column; 11-embedded screw; 12-detachable weight plate; 13-additional weight plate; 14-stay cable; 15-stay cable end plate; -direction hinge; 18-anchor top plate; 19-nut; 20-screw; 21-PVC casing; 22-detachable screw; 23-screw hole; 24-pulley.

detailed description

This embodiment focuses on the structural features and functions involved in the present invention, and is described in detail as follows in conjunction with the accompanying drawings:

As shown in Figure 1, the high-altitude suspension composite steel truss load-bearing platform consists of a bottom steel truss 1, an upper steel truss 2, a scaffold formwork system 3, a recoverable screw 9, a partially recoverable screw 7, guide rails 8, and Detachable weight plate 12, additional weight plate 13, dragline 14, structural column 10 are formed. The bottom steel truss 1 is fixed on the concrete floor through a recoverable screw 9 and a partially recoverable screw 7 . The detachable weight plate 12 is connected to the bottom steel truss 1 , and the additional weight plate 13 is placed on the detachable weight plate 12 . The upper steel truss 2 is connected with the bottom steel truss 1 through the guide rail 8, and at the same time, it is connected by bolt welding. The stay cable 14 connects the detachable weight plate 12 and the upper steel truss 2 .

As shown in Figure 2, the recoverable screw rod is made up of a screw rod enlarged end 16, an anchor top plate 18, a nut 19, a screw rod 20, a direction hinge 17, and a PVC sleeve 21. The PVC casing 21 is pre-embedded in the concrete floor. After the steel truss is placed, insert the screw 20 into the PVC casing 21. The anchor top plate is placed on the lower chord 5 of the bottom steel truss, and the bottom steel truss is fixed by tightening nuts 19. The screw rod 20 is provided with a direction hinge 17, which is convenient for retractable arrangement. Unscrew the nut 19 after the construction is completed, take off the anchor top plate 18, tap the top of the screw rod 20 to easily remove the whole anchor fastener, which can be used for turnover.

As shown in Figure 3, the partially recyclable screw 7 consists of a screw hole 23 embedded in the structural column 10 and a detachable screw 22. The screw hole 23 is embedded in the structural column during construction and will not be removed later. The detachable screw rod 22 is screwed into the screw hole 23 after the bottom steel truss is installed to fix the lower chord plate 6 of the bottom steel truss. Unscrew the detachable screw rod 22 during later stage dismantling, reuse.

As shown in Figure 4, the upper steel truss 2 is connected to the upper chord plate 6 of the bottom steel truss through a guide rail 8, and a pulley 24 is provided in the guide rail to facilitate the upper steel truss to slide left and right. In order to ensure the safety of the structure, the upper steel truss 2 and the upper chord plate 6 of the bottom steel truss are also connected by welding.

The construction method of the above-mentioned high-altitude suspended composite steel truss load-bearing platform includes the following construction steps:

Step 1. Pre-embedding of screw related parts: Before the construction of the concrete structure layer, the PVC sleeve 21 of the recyclable screw, the vertical anchor screw 20 and the screw hole of the partially recyclable screw in the structural column need to be embedded;

Step 2: hoisting the steel truss into place: hoist the underlying steel truss after the maintenance of the concrete structural slab is completed, and fix the underlying steel truss 1 by using the pre-embedded recoverable screw 9 and the partially recoverable screw 7 .

Step 3. Installation of detachable weight plates 12 and additional weight plates 13: After the bottom steel truss 1 is installed, the detachable weight plates 12 are welded and connected, and the number of additional weight plates 13 is determined according to the actual project. The plate 13 is arranged on the detachable weight plate 12 .

Step 4, guide rail installation: the guide rail 8 is installed on the top of the bottom steel truss 1;

Step 5. Installation of the upper steel truss 2: Insert the upper steel truss 2 on the guide rail 8 to form an embedded connection. After the embedded connection is completed, connect the upper steel truss 2 and the bottom steel truss 1 by bolt welding;

Step 6, installation of the cable 14: install the cable 14 between the detachable weight plate 12 and the end of the upper steel truss 2;

Step 7. Erection of the scaffold formwork system: use the upper steel truss 2 to protrude from the structure to erect a scaffold formwork system with a cantilevered structure, and the protruding steel truss is used as the load-bearing platform of the scaffold formwork system.

Claims (6)

1. a kind of construction method of high-altitude overhanging superposed type steel truss bearing platform it is characterised in that described bearing platform mainly by Bottom steel truss, top steel truss, scaffold formwork system, pre-buried recoverable screw rod, local recoverable screw rod, guide rail, Removable jointing plate, additional jointing plate, drag-line and structural column composition；Bottom steel truss passes through pre-buried recoverable screw rod, locally Recoverable screw rod is fixed on constructs on the structural column completing, is connected with removable fixing jointing plate and adds outside bottom steel truss Jointing plate；Top steel truss utilizes bolt weldering combination and guide rail to connect bottom steel truss, in removable jointing plate and top steel truss It is provided with drag-line between end；Top steel truss stretch out become outside structure top cantilevered structure scaffold formwork system load-bearing put down Platform；

The construction method of high-altitude overhanging superposed type steel truss bearing platform includes following construction procedure：

Step one, screw rod associated part are pre-buried：Before concrete construction, imbed the PVC sleeve pipe of recoverable screw rod and erect To anchorage screw, screw hole in structural column for the local recoverable screw rod；

Step 2, steel truss lifting are in place：Bottom steel truss is lifted, using pre-buried recyclable after the completion of concrete structural slab maintenance Formula screw rod and local recoverable screw rod fix bottom steel truss；

Step 3, removable jointing plate, additional jointing plate are installed：It is welded to connect removable ballast after bottom steel truss installation Plate, according to the actual quantity determining additional jointing plate of engineering, additional jointing plate is arranged on removable jointing plate；

Step 4, guide rails assembling：Guide rails assembling is in bottom steel truss top of the trellis；

Step 5, upper steel truss installa-tion：On guide rail, insertion top steel truss, forms embedded connection, and embedded connection completes Connect top steel truss and bottom steel truss with bolt weldering mode afterwards；

Step 6, drag-line are installed：Drag-line is installed between removable jointing plate and top steel truss end；

Step 7, scaffold formwork system are set up：Stretch out the scaffold that structure division sets up cantilevered structure using top steel truss Formwork system, section of stretching out steel truss is as the bearing platform of scaffold formwork system.

2. construction method according to claim 1 is it is characterised in that pre-buried recoverable screw rod is arranged at bottom steel truss Under concrete floor in, by pvc pipe, vertical anchorage screw and anchoring top board form, PVC sleeve pipe is placed on vertical anchorage screw Outward, anchoring top board is fixedly installed on boom plate under bottom steel truss by vertical anchorage screw and nut；On vertical anchorage screw It is provided with direction hinge.

3. construction method according to claim 1 is it is characterised in that local recoverable screw rod is arranged in structural column.

4. construction method according to claim 1 is it is characterised in that removable jointing plate passes through pre-buried returning with concrete Receipts formula screw rod connects, and additional jointing plate is concrete block, is placed on removable jointing plate.

5. construction method according to claim 1 is it is characterised in that guide rail is arranged at the upper string board of bottom steel truss, embedding Enter formula and connect top steel truss, guide rail both sides are provided with pulley, top steel truss utilizes the pulley in guide rail to realize sliding.

6. construction method according to claim 1 is it is characterised in that drag-line one end is provided with termination and is embedded in removable In jointing plate, the other end connects top steel truss.