CN101956464B

CN101956464B - Method for strengthening wood beam

Info

Publication number: CN101956464B
Application number: CN2010102785198A
Authority: CN
Inventors: 许清风; 李向民; 陈建飞; 邱文军
Original assignee: SCI-TECH DEVELOPMENT CORP SHANGHAI CITY INST OF BUILDING SCIENCE; Shanghai Building Science Research Institute Group Co Ltd
Current assignee: Shanghai Jianke Prestress Technology Engineering Co., Ltd.
Priority date: 2010-09-10
Filing date: 2010-09-10
Publication date: 2012-02-22
Anticipated expiration: 2030-09-10
Also published as: CN101956464A

Abstract

The invention relates to the field of construction engineering, in particular to construction strengthening and modification and discloses a method for strengthening a wood beam. The method for strengthening the wood beam comprises the following steps of: (1) performing surface evenness treatment on a stressed surface of the wood beam, scrubbing with acetone, and if a bottom face has a crack or recess, mending by adopting mending glue; (2) selecting bamboo chips which are treated by surface processing and are 3 to 7 millimeters thick, 10 to 25 millimeters wide and as long as the wood beam, and scrubbing with the acetone; and (3) coating base glue on the drawn face of the wood beam, adhering at least one layer of bamboo chips on the stressed surface of the wood beam by using structural glue and pressing to ensure that the bamboo chips, the structural glue and the wood beam are bonded compactly. The method can effectively avoid dismantling the original structure, guarantee the bearing capability and durability of the wood beam and meet the subsequent use requirements. The bamboo chip is a regenerative material and has high anti-drawing strength, so that the resource and energy consumption of the construction strengthening and modifying industry can be effectively reduced by using the bamboo chips to strengthen the wood beam.

Description

A kind of method of reinforcing wood beam

Technical field

The present invention relates to building engineering field, be specifically related to the building reinforce transformation, especially the maintenance and reinforcement of wooden frame.

Background technology

Mostly China's traditional architecture is wooden construction or post and panel structure.Because aging or service load increase often causes the wooden frame anti-bending bearing capacity not enough, need reinforce.The general modes that adopt whole replacing of past more; But because China's wooden construction adopts joggle more; Change wooden frame and just need take original structure apart, certainly will have influence on the globality and the safe handling of continuous pin, sets of brackets on top of the columns and timber roof truss, serious even elevation of building that can destroy building and style and features characteristic.

If the reinforcement means of taking to paste bamboo chip at the wooden frame tension face can effectively avoid dismounting badly original structure, and guarantee that the wooden frame bearing capacity satisfies follow-up instructions for use.

Summary of the invention

The present invention aims to provide a kind of method of reinforcing wood beam.

A kind of method of reinforcing wood beam, its technical scheme may further comprise the steps:

(1) the wooden frame tension face is carried out surface finish and handle, also clean, when crack or pit being arranged, adopt repair sheets to repair like tension face; Available acetone is cleaned the wooden frame tension face;

(2) select that the 3mm～7mm that handles through Surface Machining is thick, 10mm～25mm is wide for use, with the isometric bamboo chip of wooden frame, and clean; Smear primer at the wooden frame tension face, then with structure glue will be at least one deck bamboo chip stick on the wooden frame tension face, and compacting guarantees that bamboo chip, structure glue-line and wooden frame combine closely.Available acetone is cleaned bamboo chip.

When the wooden frame height was not more than 150mm, the bamboo chip that uses was one deck, and thickness is 3mm～5mm;

When wooden frame height during greater than 150mm, the bamboo chip that uses is one deck, thickness 5mm～7mm; Perhaps use two-layer bamboo chip, the thickness 3mm～5mm of every layer of bamboo chip bonds with structure glue between the two-layer bamboo chip.

There is bamboo culture in several thousand in China, has abundant bamboo timber resource in the East China.The bamboo wood maturity period is shorter, can become a useful person in general 4～6 years; The bamboo wood power of regeneration is extremely strong, lasting production capable of circulation; Can not produce environment behind the bamboo wood end of life and pollute, be the continuable constructional materials of a kind of low-carbon (LC).Bamboo wood dense structure, exquisite in texture have tensile strength height, even, the high ratio of strength to weight of material, good stability, outstanding advantage such as wear-resisting, can be used on the tensile region and bear pulling force.

Therefore, the present invention receives force mode (top is the pressurized edge, and the bottom is the tight side edge) according to the freely-supported wooden frame, pastes bamboo chip at wooden frame tight side edge through structure glue, recovers and improves its intensity.Wooden frame after this method is reinforced, its bearing capacity can increase more than 60%.

Utilize the bamboo chip reinforcing wood beam, can not only overcome the shortcoming of a whole replacement method, effectively avoid dismounting badly original structure, can also guarantee the bearing capacity and the durability of wooden frame, satisfy follow-up instructions for use.Bamboo chip is a kind of recyclable materials, and has good tensile strength, uses the bamboo chip reinforcing wood beam can effectively reduce the consumption of existing building strengthening reconstruction industry to energy resource.Therefore, adopting the bamboo chip reinforcing wood beam is a kind of efficient ways.

Description of drawings

Fig. 1 is vertical sketch map of embodiment

Fig. 2 is the sectional drawing of embodiment in the A-A direction

The 1-wooden frame, 2-bamboo chip, 3-tension face, 4-compression face, 5-structure glue-line

The specific embodiment

Embodiment 1

Because service load increases, height 200mm wooden frame bearing capacity can not satisfy safety requirements, need reinforce.Like Fig. 1, shown in 2, the top of wooden frame 1 is compression face 4, and the bottom is a tension face 3.Implementation step is:

(1) load that earlier wooden frame is born unloads.Tension face 3 (being the bottom surface) to wooden frame 1 carries out the surface finish processing, and cleans with acetone, tension face (bottom surface) planeness and cleannes is satisfied paste requirement.There are crack or pit like the bottom surface, then need to repair with repair sheets.

(2) select that 5mm through processed is thick, 18mm is wide for use, with the isometric bamboo chip 2 of wooden frame, and clean with acetone.

Smear primer at the wooden frame tension face, with structure glue bamboo chip 2 is sticked on wooden frame tension face 3 then, form structure glue-line 5, and compacting guarantees that bamboo chip, structure glue-line 5 and wooden frame combine closely.

After treating that structure glue is solidified fully, the wooden frame that adopts bamboo chip to reinforce can continue to carry.

The wooden frame of high 200mm, wide 100mm, total length 4m, as span be 3.6m, when the load(ing) point spacing is 1.2m, the bearing capacity of unguyed wooden frame is about 29kN, adopts bamboo chip to reinforce the back bearing capacity and brings up to 61～72kN.

Embodiment 2

Because aging, height 120mm wooden frame bearing capacity can not satisfy safety requirements, need reinforce.Like Fig. 1, shown in 2, the top of wooden frame 1 is compression face 4, and the bottom is a tension face 3.

Implementation step is:

(2) select that 5mm through processed is thick, 15mm is wide for use, with the isometric bamboo chip 2 of wooden frame, and clean with acetone.

High 120mm, wide 60mm, the wooden frame of total length 2.5m adopts bamboo chip to reinforce the back bearing capacity and can improve more than 60%.

Claims

1. the method for a reinforcing wood beam is characterized in that, may further comprise the steps:

(1) the wooden frame tension face is carried out surface finish and handle, also clean, when crack or pit being arranged, adopt repair sheets to repair like tension face;

(2) select that the 3mm～7mm that handles through Surface Machining is thick, 10mm～25mm is wide for use, with the isometric bamboo chip of wooden frame, and clean; Smear primer at the wooden frame tension face, then with structure glue will be at least one deck bamboo chip stick on the wooden frame tension face, and compacting guarantees that bamboo chip, structure glue-line and wooden frame combine closely.

2. the method for the said a kind of reinforcing wood beam of claim 1 is characterized in that, when the wooden frame height was not more than 150mm, the bamboo chip that uses was one deck, and thickness is 3mm～5mm.

3. the method for the said a kind of reinforcing wood beam of claim 1 is characterized in that, when wooden frame height during greater than 150mm, the bamboo chip that uses is one deck, thickness 5mm～7mm; Perhaps use two-layer bamboo chip, the thickness 3mm～5mm of every layer of bamboo chip bonds with structure glue between the two-layer bamboo chip.

4. the method for the said a kind of reinforcing wood beam of claim 1 is characterized in that, cleans the wooden frame tension face with acetone in the step (1).

5. the method for the said a kind of reinforcing wood beam of claim 1 is characterized in that, step is cleaned bamboo chip with acetone in (2).