A construction method for thin-layer epoxy structural adhesive bonding of steel-concrete composite beams
A technology of epoxy structural adhesive and steel-concrete bonded beam, which is applied in building structure, construction, etc., can solve the problems affecting the performance of steel-concrete bonded beam, air bubbles, and failure to achieve effective bonding.
Active Publication Date: 2020-10-20
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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Problems solved by technology
However, if the epoxy structural adhesive is not evenly paved during the construction process, there will be air bubbles and gaps between the board and the epoxy structural adhesive layer, which will affect the performance of the steel-concrete composite beam.
At the same time, since the epoxy structural adhesive has not completely condensed during the installation of the precast concrete slab, it still has a certain degree of fluidity, and the effective bonding of the precast concrete slab has not been achieved at the initial stage of installation. Slippage inevitably occurs along the slope direction, affecting installation accuracy
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[0032] refer to Figure 1-Figure 3 , a construction method for bonding steel-concrete composite beams with thin-layer epoxy structural adhesives, comprising the following steps:
[0033] S1: Determine the size l of rubber strip 1 according to actual needs 1 , l 2 , b and the reserved compression height Δh, the size of the rubber strip 1 is l 1 , l 2 are respectively the length of the longitudinal edge and the length of the transverse edge on the upper surface of the steel beam 2, b is the width of the rubber strip 1, and the Δh is the reserved compression height of the rubber strip 1;
[0034] S2: determine the elastic modulus E of the rubber strip 1;
[0035] S3: Determine the surface friction coefficient μ between the rubber strip 1 and the bottom surface of the precast concrete slab 4, so that μ≥i;
[0036] S4: bonding the rubber strip 1 to the edge of the upper surface of the steel beam 2;
[0037] S5: paving a thin layer of epoxy structural adhesive 3 in the rubber ...
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The invention relates to a construction method for thin-layer epoxy structural adhesive adhesion of a steel-concrete combined beam. The method includes the following steps that S1, sizes 11, 12 and bof rubber strips and a reserved compression height delta h are determined according to actual requirements, wherein the sizes 11 and 12 of the rubber strips refer to the length of the longitudinal edges of the upper surface of a steel beam and the length of the transverse edges of the upper surface of the steel beam respectively, b refers to the width of the rubber strips, and delta h refers to the reserved compression height of the rubber strips; S2, the elasticity modulus E of the rubber strips is determined; S3, the surface friction coefficient mu between the rubber strips and the bottom surface of a prefabricated concrete plate is determined, so that mu is larger than or equal to i; S4, the rubber strips adhere to the edges of the upper surface of the steel beam; S5, a thin-layer epoxystructural adhesive is laid in the rubber strips; and S6, the prefabricated concrete plate is installed, and the reserved compression height delta h is gradually reduced to be close to 0 under the self-weight action of the prefabricated concrete plate, so that the epoxy structural adhesive gradually becomes compact and uniform under the self-weight action of the prefabricated concrete plate, andhigh-quality adhesion of the prefabricated concrete plate and the steel beam is realized.
Description
technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a construction method for bonding thin-layer epoxy structural adhesives of steel-concrete composite beams. Background technique [0002] During the construction of some steel-concrete composite beams, the upper precast concrete slab needs to be bonded to the lower steel beam with epoxy structural adhesive. However, if the epoxy structural adhesive is not evenly paved during the construction process, there will be air bubbles and gaps between the board and the epoxy structural adhesive layer, which will affect the performance of the steel-concrete composite beam. At the same time, since the epoxy structural adhesive has not completely condensed during the installation of the precast concrete slab, it still has a certain degree of fluidity, and the effective bonding of the precast concrete slab has not been achieved at the initial stage of installation. Slippage inevit...
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IPC IPC(8): E04B1/38
CPCE04B1/38E04B1/383
Inventor 李玉军冀光华王志春吕丹峰李鸿博郑文龙刘宗孝彭瑞臣朱丰军胡建鑫郜启卫叶子阳宋军杨宇轩
Owner CHINA RAILWAY TUNNEL GROUP CO LTD