How can high level features be concatenated with low level features in a CNN using keras?

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I am trying to pass and concatenate the output of one layer to another layer in a CNN as shown in the following image. 30x30x512 layer is concatenated with 15x15x1024 after reshaping.

enter image description here

Please note that two different models and merging them is not the solution I am looking for. I am want to know how I can use the same model to merge the mentioned layers.

Thank you in advance for your suggestions.

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