CN107675899A - A kind of connecting elements and its construction method of the displacement of existing building pin - Google Patents

Abstract

The present invention relates to a connecting member for replacing existing building wooden columns and a construction method thereof. The connecting member includes: an upper hammer-shaped steel structure connector 1, which is composed of a steel pipe sleeve and an inner hollow steel structure cube (without the bottom and the right side), Two openings are reserved on three sides of the steel structure cube 3, two holes are reserved on the steel plate 5, holes are reserved on the cylindrical steel casing, four screws on the upper connector 4; Hammer-shaped steel structure connector 2; four fixed screw nuts 6. Construction steps: set up temporary support system, remove damaged wooden columns and original steel structure connectors, install new bottom and upper hammer-shaped steel structure connectors, install and fix columns, and remove temporary supports.

Description

A connecting component for replacing wooden columns of existing buildings and its construction method

technical field

The invention relates to the field of building technology, in particular to a wooden column connection structure and a local replacement construction method, which is suitable for partial replacement of wooden structural columns with low strength or serious quality defects.

Background technique

In recent years, in developed countries in Europe and the United States, cross laminated timber (CLT), a new generation of heavy-duty wood structure building materials, is partially replacing reinforced concrete and is widely used in residential buildings and public buildings. Due to its superior performance, CLT heavy wood structure is breaking through the limit of the floor height of traditional wood structure buildings, and has begun to be used in high-rise buildings.

Compared with the traditional building system, CLT and its heavy-duty wooden structure building system have the following advantages: stable size, strong bearing capacity, sound insulation, strong thermal insulation performance, good fire performance, fast construction and low noise, low-carbon environmental protection, wide application range, It can be used in low, middle and even high-rise residential buildings and non-civil buildings. Obviously, the above advantages will effectively promote the rapid development of the industrialization of wood structure buildings.

In 2012, a 10-storey CLT structure building named Forte was completed in Melbourne, which is the first high-rise CLT structure building in Australia. In 2017, the world's tallest 18-story prefabricated wooden structure was built at Columbia University. The building is a beamless floor structure, that is, the CLT floor is directly supported on the wooden columns, and the load needs to be transferred between the column and the slab through connecting members. The method is to install an interference-fit circular steel sleeve at the bottom of the upper column and the top center of the lower column, and insert the steel sleeve of the upper column into the steel sleeve of the lower column to transmit the load. The four corners of the four CLT floor slabs are placed on the top of the lower column and anchored to the lower column with screws. A gap of a certain height is reserved between the upper surface of the CLT and the bottom of the upper column as the work space for the CLT anchor nuts. Lay floor tiles to fill the gaps left. This kind of building has played a demonstration role for the development of wooden structures in the world, and pointed out the direction for the development of my country's prefabricated glulam structures.

The connecting members at the slab-column joints of this exemplary fabricated bamboo-wood structure are shown in Figures 1 and 2. Figure 1: The upper steel structure connector 1 (composed of square steel plates and steel pipe sleeves), the upper end of the upper steel structure connector steel plate is four screw rods 6, and the lower end is four threaded screw rods 7. Bottom steel structure connector 3 (composed of square steel plate and steel pipe sleeve), four screw rods 8 at the upper end of the bottom steel structure connector steel plate. Lower column 2, four holes 9 are reserved at the top of the lower column. Upper column 4, four holes 10 are reserved at the lower end of the upper column. four nuts5. Figure 2: The corners of the four CLT boards have 1/4 circular cuts and reserved holes.

Please see Figures 1, 2, and 3 for details. The connection steps at the joints of this kind of exemplary prefabricated wood structure slabs and columns: first install the upper steel structure connector on the top of the lower column, and the four threaded screws at the lower end of the steel plate of the upper steel structure connector are just inserted into the upper end of the lower column. inside a hole. Then put the four CLT boards (with a 1/4 circular cut and reserved holes at the corners of the CLT boards) on the upper connector just enough to wrap the steel sleeve, and the screw at the upper end of the upper steel structure connector steel plate passes through the four Reserve a hole on the CLT board and screw it on the screw with a nut. Then install the bottom steel structure connector on the upper steel structure connector, and then fix the upper and lower sleeve holes by inserting bolts after overlapping. Finally, install and fix the four holes at the bottom of the upper column to meet the four screws at the upper end of the steel plate of the steel structure connector at the bottom, forming a slab-column joint of the beamless floor as shown in Figure 3.

Please refer to FIG. 3 , which is a schematic diagram of joints of an exemplary fabricated wood structure slab-column. Bottom steel structure connector 1. Upper steel structure connector 2. Four holes 3 are reserved for inserting four threaded screw rods at the lower end of the upper steel structure connector steel plate into the post. CLT floor 4. Upper column 5. Lower column 6. Nut 7.

In prefabricated wood structure buildings, columns are the most stressed components, and their performance has an important impact on the overall stability of the structure. Cracking damage, overall tilting damage, etc. will occur during the use of the column. As a result, the column loses its bearing capacity, and the column that loses its bearing capacity must be replaced. The replacement of wooden columns in wooden structure buildings is quite different from the replacement of frame columns in concrete structures and steel structures. It is necessary to replace the old and new wooden columns with a small lifting stroke of the jack, which objectively requires the replacement of the original The transformation of the joint structure, that is, the sleeve structure device, and certain construction methods can ensure the smooth realization. This patent provides a node transformation scheme and a corresponding construction process.

Contents of the invention

Please refer to Figure 4 for details, the steel structure connecting member for wood column replacement. The connecting member includes: an upper hammer-shaped steel structure connector 1, which is composed of a steel pipe sleeve and an inner hollow steel structure cube (without the bottom and the right side). There are two openings 3 on the three sides of the connector, and a steel stop There are two perforations 5 on the board, and four screw rods 4 on the connector. The bottom hammer-shaped steel structure connector 2 is composed of a steel pipe sleeve and an internal hollow steel structure cube (without the top and right side), and the side of the connector and the steel baffle also have openings. Four fixed screw nuts 6.

The hammer-shaped steel structure connector is composed of a steel pipe sleeve and an internal hollow steel structure cube. Both hollow steel structure cubes lack a side, which is convenient for column installation from the side. Holes are reserved on the steel structure surfaces of the cube, and holes are reserved on the four sides of the upper and lower ends of the column, as shown in Figure 5. Then penetrate one surface of the steel connecting member cube of the reserved hole, the wooden column, the opposite side of the steel connecting member cube successively with a long screw rod, and finally tighten the nut.

Construction steps for wooden column replacement: set up temporary support system, remove damaged wooden columns and original steel structure connectors, install new bottom and upper hammer-shaped steel structure connectors, install and fix columns, and remove temporary supports.

Description of drawings

Fig. 1 is a schematic diagram of steel structure connectors and wooden columns at joints of slab-columns in an exemplary matching wooden structure building, including: bottom steel structure connectors, upper steel structure connectors, upper columns, and lower columns.

Figure 2 is a diagram of four CLT boards with 1/4 circular cuts and reserved holes at the corners.

Figure 3 is a slab-column joint diagram of a beamless floor.

Figure 4 is a diagram of the hammer connector.

Figure 5 is a schematic diagram of the new column for replacement.

Figure 6 is a construction schematic diagram.

Figure 7 is a front view of the temporary support system.

Figure 8 is a top view of the temporary support system.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

Example:

As shown in Figure 4-8.

A connecting component for replacing existing building wooden columns and a construction method thereof. Please refer to Figure 4 for the connecting member, which includes an upper hammer-shaped steel structure connector 1, which is composed of a steel pipe sleeve and an internal hollow steel structure cube (without the bottom and the right side), and two sides are reserved on three sides of the steel structure cube. 3. Four screws on the connector 4. Two holes are reserved on the steel plate 5. Holes are reserved on the circular steel sleeve. The bottom hammer-shaped steel structure connector 2 is composed of a steel pipe sleeve and an internal hollow steel structure cube (without the bottom and the right side). There are also holes on the upper side of the steel structure cube and reserved holes on the cylindrical steel sleeve hole. Four fixed screw nuts 6.

Please refer to Figure 5. The replacement new wooden column 1 has two openings 2 on the four sides of the upper and lower ends of the wooden column. The cutting length of the new wooden column is slightly longer than that of the replaced wooden column, taking into account the elastic deformation of the wood and the post-construction settlement and creep.

Please refer to Figure 6. Set up a temporary support system 3 around the destroyed wooden column 1.

Please refer to Figure 7. The temporary support system includes: four jacks 2 placed at the bottom of the brackets, four brackets 1, four fixing devices 3 between the brackets, and four steel pads 4 on the top of the brackets. The jack is placed on the CLT floor 5 at the lower end, the steel pad on the bracket is placed on the CLT floor 8 at the upper end, the steel structure connector 6 of the upper column and the lower column, and the upper column 7.

First, build a temporary support system around the wooden columns that have lost their bearing capacity, and lift four CLT floors; then remove the damaged wooden columns and the connectors at the upper and lower ends of the log columns; then install the hammer-shaped steel structure connectors at the upper and lower ends, After the holes of the sleeve are overlapped, the pins are inserted to fix them. The four screws at the upper end of the upper hammer-shaped steel structure connector pass through the four holes of the upper CLT floor slab and are fixed with nuts; then install the column from the side of the two hammer-shaped steel structure connectors. , snap the new wooden column into the square steel structure connector; then weld the two steel plates on the sides of the upper and lower hammer-shaped steel structure connectors respectively; then use the screw (6 in Figure 4) to penetrate the steel structure connection The holes reserved on the side steel plate of the device, the holes reserved on the wooden column, and the holes reserved on the opposite side of the steel plate of the steel structure connector are tightened with nuts; finally, the temporary support system is removed to complete the replacement of the wooden column that has lost its bearing capacity.

In summary, the present invention provides a connecting member for replacing existing building wooden columns and its construction method, which effectively replaces existing wooden columns of prefabricated building structures by setting vertical supports around the wooden columns; Install a new steel structure connector and insert the replaced new column into the upper and lower steel structure connector from the side, then weld the two steel plates at the upper and lower ends of the steel structure connector and fix the steel structure connector and wooden column with nuts, and finally remove the vertical support . The invention not only realizes the effective replacement of the wooden columns inside the existing buildings, but also has a short construction period and does not affect the normal use of the buildings during the construction period. At the same time, the connection between the new steel structure connecting member and the wooden column is firm, the connection method is simple, the construction is convenient, and the cost is reduced, which effectively meets the needs of practical engineering applications and provides important technical support for the vigorous promotion of prefabricated bamboo and wood structures. With the promotion of wooden structures, greater social and economic benefits will be achieved.

Claims (3)

1. A connecting component and construction method thereof for the replacement of existing building wooden columns, characterized in that it includes an upper hammer-shaped steel structure connector, which is composed of a steel pipe sleeve and an internal hollow steel structure cube (without the following and the right side), the described Two openings are reserved on three sides of the steel structure cube, two holes are reserved on the steel plate, holes are reserved on the cylindrical steel sleeve, and the screw on the upper connector; the hammer-shaped steel structure connector at the bottom; fixed screw nut. 2. A connecting member for replacing existing building wooden columns according to claim 1, characterized in that: there are 4 screws on the upper connector and 4 screws on the fixing column. 3. Construction steps: set up temporary support system, remove damaged wooden columns and original steel structure connectors, install new bottom and upper hammer-shaped steel structure connectors, install and fix wooden columns, and remove temporary supports.