In the equilateral $\bigtriangleup ABC$, $D$ is a point on side $BC$.  $O_1$ and $I_1$ are the circumcenter and incenter of $\bigtriangleup ABD$ respectively, and $O_2$ and $I_2$ are the circumcenter and incenter of $\bigtriangleup ADC$ respectively.  $O_1I_1$ intersects $O_2I_2$ at $P$.  Find the locus of point $P$ as $D$ moves along $BC$.
1. **Setup and Initial Observations:**
   - Consider the equilateral triangle $\triangle ABC$ with vertices $A(0, \sqrt{3})$, $B(-1, 0)$, and $C(1, 0)$.
   - Let $D$ be a point on side $BC$.
   - Define $O_1$ and $I_1$ as the circumcenter and incenter of $\triangle ABD$, respectively.
   - Define $O_2$ and $I_2$ as the circumcenter and incenter of $\triangle ADC$, respectively.
   - The line segments $O_1I_1$ and $O_2I_2$ intersect at point $P$.

2. **Concyclic Points:**
   - **Claim:** Points $A, B, D, O_2, I_2$ are concyclic.
   - **Proof:**
     - Note that $\angle AO_2D = 2 \angle ACD = 120^\circ$.
     - Also, $\angle AI_2D = 90^\circ + \frac{1}{2} \angle ACD = 120^\circ$.
     - Hence, $A, O_2, I_2, D$ are concyclic.

3. **Circumcircle of $\triangle ADC$:**
   - Show that $O_2$ lies on the circumcircle of $\triangle ADC$ centered at $O_1$.
   - Note that $\angle AO_1B = 2\alpha = \angle AO_2C$.
   - This implies a spiral similarity $\triangle AO_1B \sim \triangle AO_2C$.
   - Therefore, $\triangle AO_1O_2 \sim \triangle ABC$, so $O_2O_1 = AO_1 = DO_1 = BO_1$.
   - Hence, $A, D, C, O_2$ are concyclic.

4. **Symmetry and Concyclic Points:**
   - By symmetry, $A, C, D, O_1, I_1$ are also concyclic.

5. **Center of Circumcircle of $\triangle PO_1O_2$:**
   - Show that $D$ is the center of the circumcircle of $\triangle PO_1O_2$.
   - Observe that $PO_1 \parallel AI_2$ since:
     \[
     \angle AO_1P = \angle AO_1I_1 = 180^\circ - \angle ADI_1 = 180^\circ - \frac{1}{2} \alpha
     \]
     and
     \[
     \angle I_2 A O_1 = 90^\circ - \angle I_2 D A = \frac{1}{2} \alpha.
     \]
   - Thus,
     \[
     \angle O_2 P O_1 = 180^\circ - \angle AI_2P = \angle AI_2O_2 = \angle ADO_2 = 30^\circ.
     \]
   - Since $\triangle DO_1O_2$ is equilateral, $\angle O_2DO_1 = 60^\circ$.

6. **Angle Calculations:**
   - Calculate $\angle PDO_1 = 180^\circ - 2\angle DOP_1$.
   - Compute:
     \[
     \angle DO_1P = \angle DO_1I_1 = \angle DAI_1 = \frac{1}{2} \angle DAB,
     \]
     so $\angle PDO_1 = 180^\circ - \angle DAB$.
   - However, $\angle O_1DB = 90^\circ - \angle DAB$, so $\angle BDP = 90^\circ$.

7. **Coordinate Determination:**
   - Let $D = (x, 0)$.
   - By the Law of Sines:
     \[
     2 DO_1 = \frac{AD}{\sin \angle ABD} = \frac{\sqrt{3 + x^2}}{\frac{\sqrt{3}}{2}} \implies PD = \sqrt{\frac{x^2 + 3}{3}}.
     \]
   - Clearly, $P$ is on the opposite side of $BC$ from $A$.

8. **Locus of Point $P$:**
   - The locus of point $P$ as $D$ moves along $BC$ is the curve $y = -\sqrt{\frac{x^2 + 3}{3}}$ where $x \in (-1, 1)$.

The final answer is $\boxed{y = -\sqrt{\frac{x^2 + 3}{3}}}$