Object get into a Static Body

Hi everyone, i meet a trouble with chipmunk physic. I have a tank and a box here my code example:
code fox Box:
auto edgeSp = Sprite::create();
auto boundBody = PhysicsBody::createBox(Size(100, 100));
boundBody->setContactTestBitmask(0x1);
boundBody->setDynamic(false);
edgeSp->setPhysicsBody(boundBody);

code for Tank:
Sprite* tank=Sprite::create(“tank.png”);
auto physicbody = PhysicsBody::createBox(this->getContentSize());
physicbody->setContactTestBitmask(0x1);
tank->setPhysicsBody(physicbody);

and my trouble is when i set setvelocity for tank,tank can get into the Box then pushed out. How i can prevent that?