Method of pre-tension of glued wooden packages in across-grain direction

FIELD: construction.

SUBSTANCE: invention refers to the sphere of construction technologies and immediately deals with glued wooden structures. The suggested method of pre-tension of glued wooden packages in the across-grain direction presupposes their compression with the help of steel rods. The element of novelty consists in applying to the wooden package being forced together a pressure of 0.5 MPa with the help of steel rods gummed down inside the pre-drilled holes arranged along the whole of the package length (the spacing being equal to 300-500 mm.). The length of the rods is equal to the package width with due allowance for its eventual reduction after application of force-together pressure.

EFFECT: minimisation of material and labour expenditures related to pre-tension of glued wooden packages in the across-grain direction without distortion of their overall dimensions.

3 ex

 

The invention relates to the construction and can be used in glued wooden structures.

There is a method of creating a preliminary voltage in packages of boards in a direction across the fibers by tension steel rods placed in the body of the package in the pre-drilled holes (Dmitriev P.A. Construction of wood and plastics. A special course. Road and pedestrian bridges. - Orenburg, IPK "Gazpromviet", 2002, s-98, RIS). After a set package of boards in his body in a pre-drilled through the template holes have steel rods threaded at the ends, and the length of the rods is assigned more than the width of the package. Anchoring and tensioning of the steel rods is carried out by using steel plates and tensioning nuts. For conservation efforts compression during operation from one side of the rod are leaf springs. The creation of the preliminary voltage with flexible service boards in the direction across the grain prevents the formation usushechnye cracks, which increases its reliability and aesthetic qualities.

The disadvantages of this known method is the increased intensity due to the need to use rods with a length greater than the width of the package, as well as devices tensioning devices, which are for abarat package that eliminates the possibility of a tight pair of packets between a width.

The technical result to be obtained from use of the invention is to reduce the consumption of materials and labor to create a pre-stress in the glued timber packages in a direction across the fibers while maintaining their size.

The problem is solved due to the fact that in the method of creating a pre-stress in the glued wooden packets in the direction across the grain, providing compression of the steel rods, compression is provided by the pressing of wood glued service pressure of 0.5 MPa steel rods glued in increments of 300-500 mm across the length of the packet in the pre-drilled holes, and the length of the rods is equal to the width of the parcel by its reduction after the transfer of the pressing pressure.

The method is as follows.

In a prepared whips-drill blanks on the template holes for the subsequent installation of the steel rods. The diameter of holes shall be taken at 5 mm larger than the diameter of the rods on the recommendations of SNiP II-25-80, p. If you have a special drilling device, precluding withdrawal of the drill holes can be drilled in collected to inject packets. After application to the scourge-procurement glue perform the btes, the ku pack, in the pre-prepared holes enter the estimated amount of glue, such as epoxy, and insert steel rods. Perform the injection of the service pressure of 0.5 MPa, which provides a solid monolithic adhesive bonding (instructions for the manufacture and quality control of glulam structures, M., Institute them. Vouchering, 1982, p.26, p), the value of the pressed pressure 3.6 times below the limit voltage at which the wood works in the elastic stage in the direction across the grain.

During the pressing decreases the width of the package by the value

where σZap=0.5 MPa - value supressonego pressure;

b - the width of the package to the application pressing pressure;

- the modulus of elasticity of wood across the grain.

The length of the rods is equal to the width of the package after pressing application of pressure decrease in the amount of ΔbPak. The package is kept under pressure to the desired amount of time required for setting adhesives, and then perform repressive package.

After removing the pressing pressure due to the work of wood in the elastic stage, the width of the package will seek to return to the original value, which will prevent the steel rods, the modulus of elasticity of which 525 times the modulus of elasticity of wood in the direction across the grain. This creates the initial tension of the package in the direction across the grain.

Explain the above example. Produced by the injection of the package width 1000 mm pressure of 0.5 MPa. Reducing the width of the package when the module of elasticity of wood in the direction across the grainwill be:

After the adhesive sets and repressive package for working wood in the elastic stage on the steel rod will be transmitted to the pressure of 0.5 MPa, which is in the module of elasticity of steelwill increase its length by the value of

,

thus loss of voltage will be

or 0.001 MPa,

i.e. glued on the package will be sent a preliminary voltage 0,499 MPa.

Step rods along the length of the package 300-500 mm ensures uniform transmission of the preliminary voltage across the length of the packet, which is confirmed by experiment that showed that in this step, the difference in pressure of the prestress in the places of production of rods and in the middle between them does not exceed 20%. The obtained data are in good agreement with the "guidelines for the production and control of quality wooden products and adverting is different laminated structures", p.27, p. The reduction step of rods leads to an unjustified increase of metal and complexity of the method and its increase will not allow even the transfer of pre-stress on the entire length of the package (the degree of non-uniformity exceeds 20%).

Example 1. You must create a pre-tension in a laminated package length 6.0 m width 1.0 m using a steel rod with a diameter of 10 mm, the Pressing pressure is 0.5 MPa.

Performed the alignment rods in increments of 300 mm, the Flow rate of the metal rods will be 11.7 kg, consumption of glue for sticking rods - 2,8 kg For uniform pressing pressure have a point load in the middle between the rods, which will require setting 20, Vim (the distance between the points of application of pressure should not exceed 50 cm on demand p "guide to the manufacture and quality control of glulam structures". - M., Institute, 1982, p.27). The difference in pressure of the prestress in the places of production of rods and in the middle between them will be according to experiments ≈10% (0,499 MPa and 0,449 MPa).

Example 2. All the same. Performed the alignment rods in increments of 400 mm, the Flow rate of the metal rods will amount to 8.6 kg consumption of glue for sticking rods - 2,1 kg For uniform pressing pressure required p is the situation 15 Vim. The difference in pressure of the prestress in the places of production of rods and in the middle between them will be according to experiments ≈15% (0,499 MPa and 0,424 MPa).

Example 3. All the same. Performed the alignment rods in increments of 500 mm, the Flow rate of the metal rods will amount to 6.8 kg, the consumption of adhesive for bonding the terminals to 1.6 kg For uniform pressing pressure required statement 12 Vim. The difference in pressure of the prestress in the places of production of rods and in the middle between them will be according to experiments ≈20% (0,499 MPa and 0.400 MPa).

In comparison with example # 1 step placement of rods 500 mm, the savings of metal 42% and savings of glue 43% at sufficiently ensure uniform transfer of pre-stress on the entire length of the package. In addition, further reduction in material intensity and the complexity of the method is achieved by reducing the number of pressing Vim (12 in example 3 and 20 in the example No. 1).

The experiment confirmed that the creation of pre-stress in the glued wooden packets in the direction across the grain helps to avoid the emergence of their usushechnye cracks, which is especially important in the case of application packages as wooden laminated coverings in wall enclosures, and in the case of the perception of packages of dangerous tensile stresses in the direction the lowest strength of wood. The proposed method allows the joint packages with pre-stress close to each other, for example when performing a wall covering.

A method of creating a pre-stress in the glued wooden packets in the direction across the grain of the compression of the steel rods, characterized in that the compression is provided by the pressing of wood glued service pressure of 0.5 MPa steel rods glued in increments of 300-500 mm across the length of the packet in the pre-drilled holes, and the length of the rods is equal to the width of the parcel by its reduction after the transfer of the pressing pressure.



 

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