This is a common verb construction in Spanish. Ir + a + Infinitive. It is known as the immediate future and is used to indicate actions that are shortly about to take place eg within the next ten minutes, hour, day or even next week. When the time period in the future is uncertain or a long time ahead e.g: next year the future indicative tense is used.
http://www.spanishdict.com/answers/212771/what-irainfinitive-
From Wikipedia, the free encyclopedia. Infinitive (abbreviated INF) is a grammatical term referring to certain verb forms existing in many languages, most often used as non-finite verbs. As with many linguistic concepts, there is not a single definition applicable to all languages.
https://en.wikipedia.org/wiki/Infinitive
Well.. in Spanish, an infinitive is a form of a verb that ends in -er, -ir, or -ar. The verb ir means to go~, or go to~, right? Ir+a+infinitive form of a verb makes a phrase that means to do ~(whatever the verb is) in english. For instance, let's look at the verb leer, which means to read. If you say ir a leer, it would mean to read. Well, there, I tried, but I'm still learning, so anyone, feel free to correct me! 1  Nov 16, 2011. |  link.
http://www.spanishdict.com/answers/212771/what-irainfinitive-
Ir + a Infinitivo. Practice using the Ir + a + the infinitive form of the verb to tell what someone is going to do. St. Petersburg, FL.
https://www.quia.com/rr/93710.html
In traditional descriptions of English, the infinitive is the basic dictionary form of a verb when used non-finitely, with or without the particle to. Thus to go is an infinitive, as is go in a sentence like I must go there (but not in I go there, where it is a finite verb).
https://en.wikipedia.org/wiki/Infinitive
Many of these verbs are sometimes followed by a passive infinitive. (to be + past participle): I expected to be met when I arrived at the station. They wanted to be told if anything happened. I don’t like driving myself. I prefer to be driven. Activity 1: Match the 'to infinitive' clauses to the sentence beginnings.
https://learnenglish.britishcouncil.org/en/english-grammar/verbs/verbs-followed-infinitive
1 Some verbs are followed by the to-infinitive: I decided to go home as soon as possible. We all wanted to have more English classes.
https://learnenglish.britishcouncil.org/en/english-grammar/verbs/verbs-followed-infinitive
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http://drlemon.com/Grammar/Ir.html
Ir + a Infinitivo. Practice using the Ir + a + the infinitive form of the verb to tell what someone is going to do. Kim Hukari.
https://www.quia.com/rr/93710.html
1 The gerund for the verb ir is yendo. 2  Third conjugation verbs with stem changes:  Those which have the changes o>ue>u [e.g., dormir, duermo, durmió] use that u which appears in preterit third-persons forms in the gerund: dormir > durmiendo; morir > muriendo.
http://users.ipfw.edu/JEHLE/COURSES/GERUND.HTM
what is the ir plus a infinitive
The IR plus a infinitive is known as the immediate future and is used to indicate actions that are shortly about to take place that is within the next ten minutes, hour, day or even next week.  